JP3196902B2 - Engine ISC valve control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an ISC valve of an engine which uses an air conditioner correction value and an air conditioner clutch correction value as correction terms when setting the opening of an ISC valve.

[0002]

2. Description of the Related Art In general, in idle operation, when an air conditioner is driven, a load on an engine becomes large. Therefore, an ISC (idle speed control) valve provided in an air bypass passage bypassing a throttle valve is opened. I'm trying to increase idols by increasing the degree.

For example, Japanese Patent Laid-Open Publication No. Sho 56-98629 discloses a technique in which when an air conditioner switch is ON and a cooling water temperature is higher than a set temperature, an idle target rotation speed is increased in accordance with the cooling water temperature. .

[0004]

However, the load caused by the operation of the air conditioner compressor immediately after the air conditioner switch is turned on is much larger than the load when a predetermined time has elapsed after the operation of the air conditioner. With the up rotation speed, the load at the time of the initial driving of the air conditioner cannot be fully compensated, and the engine rotation speed temporarily decreases to cause a deterioration in feeling.

When the air conditioner correction value is immediately set to 0 immediately after the air conditioner switch is turned off, particularly in an engine using a variable displacement air conditioner compressor, the capacity of the air conditioner compressor is minimized even immediately after the air conditioner switch is turned off. However, the air conditioner clutch is still connected, so that the friction from the air conditioner compressor is applied as an engine load, thereby causing the engine rotation to drop.

Further, when the ISC valve cannot obtain the set valve opening as a result of aging, the engine speed increases even if the air conditioner is driven to achieve a predetermined idle-up with the air conditioner correction value. The engine rotation becomes unstable.

As described above, in an engine using a variable displacement air conditioner compressor, the air conditioner clutch is connected until the capacity of the air conditioner compressor becomes minimum even immediately after the air conditioner switch is turned off.
Therefore, until this air conditioner clutch disengages,
The friction of the air conditioner clutch acts as an engine load. The engine load due to this friction can be compensated to some extent by the feedback control for the idling target rotation speed. However, if the load is compensated by the feedback control, the feedback control is performed when the load on the engine is suddenly released due to the disengagement of the air conditioner clutch. Includes a friction factor of the air conditioner clutch, which causes rotation fluctuation.

In view of the above circumstances, the present invention has a first object
No and this <br/> the engine speed writes drop under load of the variable capacity air conditioning compressor even immediately after turning ON the air conditioner switch, to provide a ISC valve control method for an engine capable of obtaining a stable feeling It is in.

A second object is that, even if the ISC valve deteriorates over time, a predetermined idle-up can always be obtained when the variable capacity air conditioner compressor is driven, so that the engine speed can be stabilized. I
An object of the present invention is to provide an SC valve control method.

The third purpose is to turn off the air conditioner switch.
It is an object of the present invention to provide an ISC valve control method for an engine that can improve the convergence of the engine speed without being affected by friction from a variable capacity air conditioner compressor that remains immediately after the operation.

A fourth object is to provide a variable capacity air conditioner compressor.
It is an object of the present invention to provide a method for controlling an ISC valve of an engine, which can appropriately compensate for an engine load caused by driving of a motor and improve feeling.

[0012]

To achieve the above first object, according to an aspect of, the invention of claim 1, wherein the variable capacitance air conditioning Con
Air conditioner switch with presser installed
The steady-state correction value is fixed by the set value continuously while
The transient correction value when the air conditioner switch is turned on.
Set by the first set value and then
Gradually decrease with a small second set point, at least
Above the basic characteristic value set based on the engine temperature.
The air conditioner supplement that adds the steady-state correction value and the transient correction value
Correct by positive value and bypass throttle valve
Set the opening of the ISC valve interposed in the air bypass passage.
ISC valve system to increase the intake air volume
In the control method, the transient correction value is
Is turned on and the set time elapses.
And the engine speed is preset to the idle target speed.
Only when the set value is less than or equal to the set upper limit value
The air conditioner switch is turned off by fixing the first set value.
After the set time has elapsed since the engine was
When the number exceeds the upper limit, the transient correction
Gradually reduced by the second setting until
It is characterized by the following.

[0013] To achieve the above second object, according to claim 2
The invention described in claim 1 is the air conditioner according to claim 1.
Idle when switch is turned on from off
Set according to the deviation between the target speed and the engine speed.
Feedback control value and then the air conditioner switch
Idle target rotation when the ON time elapses
Set according to the deviation between the engine speed and the engine speed.
Based on the difference from the feedback control value, the air conditioner correction learning value
And set the above steady-state correction while the air conditioner switch is on.
Value when the shift position of the automatic transmission is in the travel range.
Is based on a third set value predetermined in accordance with the travel range.
When the shift position of the automatic transmission is in the N or P range.
In this case, it is necessary to fix the
Features.

[0014] To achieve the third object, according to claim 3
The invention described in claim 1 or 2
After the air conditioner switch goes from on to off,
If the air conditioner correction value is equal to or greater than the preset value,
The air-conditioner correction value is reduced by a first subtraction value every calculation cycle.
When the air conditioner correction value falls below the set value,
From the first subtraction value until the Akon correction value reaches zero
Is reduced every operation cycle by the second subtraction value which is also small
It is characterized by.

According to a fourth aspect of the present invention , the above-mentioned fourth object is achieved.
The described invention is equipped with a variable capacity air conditioner compressor.
After the air conditioner switch changes from on to off,
Turn off the air conditioner relay with a fixed delay
To shut off power transmission from the compressor to the compressor.
And at least set based on engine temperature
Correct the basic characteristic value and bypass the throttle valve
Of the ISC valve interposed in the air bypass passage
The variable volume can be set by increasing the
Increase in engine load due to driving of large air conditioner compressor
The base value for compensating for the
From the time the air conditioner switch is turned on,
Switch is turned off, and then the
Until the set time elapses, the air
Compensate for the increase in engine load associated with driving the compressor
The above air conditioner is
Set the latch correction value and change the basic characteristic value to
The throttle valve.
ISC valve interposed in the bypass air bypass passage
It is characterized by setting the opening of the valve and increasing the amount of intake air
I do.

[0016]

According to the first aspect of the present invention, the air conditioner switch is turned off.
Air-conditioning compressor driven by
Engine load increase, bypass the throttle valve
Opening setting of ISC valve interposed in air bypass passage
To compensate by increasing the intake air volume
When the set time has passed since the air conditioner switch was turned on,
And the engine speed is idle.
On the setting obtained by adding a preset value to the target rotation speed
Only when it is less than the limit value, the transient correction value is
Fixed for a set time after the air conditioner switch is turned on.
Or the engine speed exceeds the upper limit set value.
When the transient correction value is changed to the first set value until it becomes zero.
The second setting, which is smaller than the above, gradually decreases the value. Soshi
While the air conditioner switch is on,
Add the above transient correction value to the steady correction value
And set the air conditioner correction value. And at least
The basic characteristic value set based on the engine temperature is
Set the ISC valve opening by correcting with the correction value
I do.

[0017]

[0018]

The invention according to claim 2 is an air conditioner switch
Target idle speed at the point when
Set according to the deviation between the engine speed and the engine speed.
Control value and then turn on the air conditioner switch.
When the fixed time has elapsed, the idle target
Feedback set according to deviation from gin speed
Set the air conditioner correction learning value based on the difference from the control value.
You. While the air conditioner switch is on, the steady-state correction value
When the shift position of the automatic transmission is in the travel range,
A fixed third set value corresponding to the driving range
Set. The shift position of the automatic transmission is in the N, P range.
In this case, the steady-state correction value is fixed by the air-conditioner correction learning value.
Set.

[0020]

[0021]

The invention according to claim 3 is an air conditioner switch.
After the air conditioner changes from on to off, the air conditioning
If the set value is equal to or greater than the set value, the air conditioner correction value is calculated.
It decreases by the first subtraction value every period. And air conditioning
When the correction value falls below the set value, the air conditioner correction value
With the first subtraction until the corresponding zero is reached without correction
Decreased every calculation cycle by the second subtraction value smaller than the value
Let

[0023]

The invention according to claim 4 is a variable capacity air conditioner.
A compressor is installed and the air conditioner switch is turned on
After turning off, the air conditioner is
Power off the engine and power from the engine to the compressor
When transmission is interrupted, at least
The basic characteristic value set based on the
IS installed in the air bypass passage that bypasses the lube
Set the opening of the C valve to increase the amount of intake air
Therefore, the engine associated with driving the variable capacity air conditioner compressor
The base value to compensate for the increased
It is given by the clutch correction value. This air conditioner clutch supplement
A positive value is set when the air conditioner switch is turned on.
The switch is turned off, and then longer than the delay time
Variable volume until the set time elapses
Increase in engine load due to driving of large air conditioner compressor
Set by a preset value to compensate for
You.

[0025]

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

The drawings show an embodiment of the present invention. FIGS. 1 and 2 are flow charts showing a procedure for controlling an ISC valve.
4 is a flowchart showing a correction value setting procedure, FIG. 4 is a flowchart showing a basic characteristic value setting procedure, FIG. 5 is a flowchart showing an idle target rotational speed setting procedure, FIG. 6 is a flowchart showing a closed / open loop control determination procedure, and FIG. 8 is a flowchart showing an air conditioner correction value setting procedure, FIG. 9 is a flowchart showing an air conditioner correction learning procedure when the air conditioner switch is turned on, and FIG. 10 is a flowchart showing an air conditioner correction learning procedure when the air conditioner switch is turned on. 11 and 12 are flowcharts showing an AT vehicle traveling range correction value setting procedure, and FIGS. 13 and 14 are flowcharts showing an acceleration / deceleration correction setting procedure.
5 is a flowchart showing a dashpot correction value setting procedure, FIG. 16 is a flowchart showing a dashpot correction value updating procedure, FIG. 17 is a flowchart showing a radiant fan correction setting procedure, and FIGS. 18 and 19 are flowcharts showing a power steering correction value setting procedure. 20, FIG. 20 is a flowchart showing a procedure for setting an air conditioner clutch correction value, FIG. 21 is a flowchart showing a procedure for setting a post-start correction initial value, FIG. 22 is a flowchart showing a procedure for setting a post-start correction, and FIGS.
Is a flowchart showing a closed loop correction I minute updating procedure, FIG. 26 is a flowchart showing a closed loop correction I minute learning procedure, FIG. 27 is a schematic diagram of an engine control system,
FIG. 28 is a block diagram of the control device, FIG. 29 is a time chart showing the relationship between the air conditioner switch, the air conditioner correction value and the engine speed, and FIG. 30 is the running range or N, P range, AT vehicle running range correction and engine speed. FIG. 31 is a time chart showing the relationship between the idle switch, the throttle opening, the acceleration / deceleration correction, and the engine speed, and FIG. 32 is a diagram showing the relationship between the idle switch, the engine speed, and the dashpot correction value. 33 is a time chart showing the relationship between the radiator fan ON / OFF and the radiator correction, FIG. 34 is a time chart showing the hysteresis when setting the idling speed, and FIG. 35 is a power steering switch and a power steering correction value. Chart showing the relationship between the engine speed and the engine speed, FIG.
6 is a time chart showing the relationship between the capacity of the air conditioner switch, the air conditioner clutch relay, the air conditioner compressor, the air conditioner clutch correction value, and the engine speed, FIG. 37 is a time chart showing the change in the post-start correction, and FIG. FIG. 39 is a time chart showing the shift of the post-start correction value to the closed loop correction I, FIG. 40 is an explanatory diagram showing the relationship between the correction amount of the closed loop correction I and the differential rotation, and FIG. FIG. 42 is a time chart showing the relationship between the engine speed, the correction amount for the closed loop correction I, and the closed loop correction I, and FIG. 42 is a time chart showing the use status of the learning value for the closed loop correction I.

[Configuration of Engine Control System] In FIG. 27, reference numeral 1 in the drawing denotes an engine body, and in the drawing, a six-cylinder horizontally opposed engine is shown. This engine body 1
The cylinder block 2 is divided into two banks (the right bank in the figure is a left bank and the left bank is a right bank) about the crankshaft 1a.
Cylinder groups of # 3 and # 5 cylinders are arranged, and # 2 and #
A group of four and six cylinders is arranged.

Each cylinder head 3 of each bank has
Each intake port 4 is formed, and each intake port 4 communicates with an intake manifold 5. Upstream of the intake manifold 5, resonance tubes 6a and 6b are connected to correspond to the respective banks, and a variable intake valve 11c is interposed in a passage 6c connecting the resonance tubes 6a and 6b. The resonance tubes 6a and 6b, the passage 6c, and
The variable intake valve 11c constitutes a variable resonance supercharging system.

Further, the upstream of each of the resonance pipes 6a and 6b is connected to the surge tank 7 by opening the throttle chambers 11a and 11b.

An intake pipe 8 is provided upstream of the surge tank 7.
An air cleaner 9 is mounted via the air cleaner 9, and an intake air amount sensor (hot film air flow meter in the figure) 10 is interposed immediately downstream of the air cleaner 9.

Further, each of the throttle chambers 11a, 11a,
The throttle valve 11d is provided with throttle valves 11d and 11e (so-called twin throttle valves), and one of the throttle valves 11e is provided with a throttle opening sensor 12a and an idle switch 12b for detecting that the throttle valve is fully closed.
Are connected to each other.

Further, the throttle chamber 11a,
An idle speed control (ISC) valve 13 is interposed in an air bypass passage 6e connecting the passage 6d and the surge tank 7 to the downstream side of the throttle valves 11d and 11e of 11b through a passage 6d.

An injector 14 is disposed immediately upstream of each intake port 4 of each cylinder of the intake manifold 5, and the tip of each cylinder of each cylinder head 3 is exposed to the combustion chamber. A spark plug 15 is attached. An ignition coil 15 a is directly attached to a terminal of the ignition plug 15, and is connected to an igniter 16.

The fuel tank 1 is connected to the injector 14.
Fuel is pressure-fed from an in-tank type fuel pump 18 provided in 7 via a fuel filter 19, and the pressure is regulated by a pressure regulator 20.

A cooling water temperature sensor 21 faces a cooling water passage (not shown) formed in the cylinder block 2, and a right bank knock sensor 22a and a left bank knock sensor 22a are provided in each bank of the cylinder block 2, respectively. A bank knock sensor 22b is attached, and each exhaust port 23 of each cylinder head 3 communicates with each exhaust pipe 24a, 24b provided for each bank.

The exhaust pipes 24a and 24b have a right bank O2 sensor 25a and a left bank O2 sensor 2 respectively.
5b, catalytic converters 26a and 26b are interposed downstream of the O2 sensors 25a and 25b, respectively, and a catalytic converter 27 is interposed at the junction of the downstream of the catalytic converters 26a and 26b. ing.

On the other hand, a crank angle detecting crank rotor 29 and a group cylinder discriminating crank rotor 30 are mounted on a crankshaft 1a of the engine body 1 at a predetermined interval. Further, each of the crank rotors 29, 3
A first crank angle sensor 31 and a second crank angle sensor 32 each composed of an electromagnetic pickup or the like for detecting a projection serving as a detection object are provided on the outer periphery of 0. Further, a cam angle sensor 34 is provided on the outer periphery of the cam rotor 33a axially mounted on the camshaft 33. The cam angle sensor 34 determines the compression top dead center of a specific cylinder, and determines an individual cylinder based on a cam pulse from the cam angle sensor 34 and a group determination pulse from the second crank angle sensor 32.

Each of the crank rotors 29, 30,
A slit may be provided in the outer periphery of the cam rotor 33a instead of the projection.
2. The cam angle sensor 34 is not limited to an electromagnetic sensor such as an electromagnetic pickup, but may be an optical sensor or the like.

[Circuit Configuration of Control Unit] On the other hand, in FIG. 28, reference numeral 40 denotes a control unit (ECU) composed of a microcomputer. This ECU 40 includes a main computer 41 which performs ignition timing control, fuel injection control, etc., and a knock detection. It is composed of two computers, a dedicated sub-computer 42 for processing.

The constant voltage circuit 4 is provided in the ECU 40.
3 is provided, and a stabilized voltage is supplied from the constant voltage circuit 43 to each unit. The constant voltage circuit 43 is connected to a battery 45 via a relay contact of an ECU relay 44, and a relay coil of the ECU relay 44 is connected to a key switch 46.
Is connected to the battery 45 via the. The fuel pump 18 is connected to the battery 45 via a relay contact of a fuel pump relay 47.

The main computer 41 has a main C
PU48, ROM49, RAM50, backup RA
M50a, timer 51, serial interface (S
CI) 52 and an I / O interface 53 are connected to each other via a bus line 54. A backup voltage is always applied to the backup RAM 50a via the constant voltage circuit 43.

The input ports of the I / O interface 53 include an intake air amount sensor 10, a throttle opening sensor 12a, a cooling water temperature sensor 21, and a right bank O2 sensor 2.
5a, left bank O2 sensor 25b, atmospheric pressure sensor 55,
And the vehicle speed sensor 56 are connected via an A / D converter 57a, and the idle switch 12b,
Second crank angle sensors 31 and 32, cam angle sensor 34
Is connected, and the battery 45 is connected to monitor the battery voltage.

Further, the I / O interface 53
The input port of the power steering steering switch 58 for detecting a steering state, the neutral switch 59 for detecting whether the select lever of the automatic transmission is set to the neutral (N range) , the parking (P
The parking switch 60 for detecting whether the switch is set to ( i) and the starter switch 61 for detecting the starting state are connected.

The igniter 16 is connected to the output port of the I / O interface 53,
The drive circuit 57b includes a relay coil of a radiator fan relay 63 for controlling the driving of the SC valve 13, the injector 14, and the radiator fan 62, and a relay coil of an air conditioner clutch relay 65 for operating a magnetic clutch 64a of the variable capacity air conditioner compressor 64. Connected through.

On the other hand, the sub-computer 42
U66, ROM67, RAM68, timer 69, SCI
70 and an I / O interface 71 are connected to each other via a bus line 72.

The input ports of the I / O interface 71 are connected to the first and second crank angle sensors 31 and 3 respectively.
2. While the cam angle sensor 34 is connected, the right bank knock sensor 22a and the left bank knock sensor 22b
Are the amplifier 73, the frequency filter 74, and the A / D
It is connected via a converter 75.

Each of the knock sensors 22a and 22b includes, for example, a vibrator having a natural frequency substantially equal to that of knock vibration,
A resonance type knock sensor composed of a piezoelectric element that detects the vibration acceleration of this vibrator and converts it into an electric signal. It detects vibration transmitted to a cylinder block, etc., due to a combustion pressure wave during the explosion stroke of the engine, and detects the vibration. The waveform is output as a knock signal.

After the knock signal is amplified to a predetermined level by the amplifier 73, necessary frequency components are extracted by the frequency filter 74 and converted from analog data to digital data by the A / D converter 75.

The main computer 41 and the subcomputer 42 are connected by a serial line via SCIs 52 and 70, and the output port of the I / O interface 71 of the subcomputer 42 is connected to the main computer 41. It is connected to the input port of the I / O interface 53.

The main computer 41 calculates an ignition timing or the like based on the crank pulse, and when a predetermined ignition timing is reached, outputs an ignition signal to the corresponding cylinder.
The sub-computer 42 calculates the engine speed from the input interval of the crank pulse, and based on the engine speed and the engine load, the knock sensors 22a, 22
A sample period of the knock signal from 2b is set, and in this sample period, the knock signal from each of the knock sensors 22a and 22b is A / D-converted at a high speed, and the vibration waveform is faithfully converted into digital data. Is determined.

The result of the determination as to whether or not knocking has occurred is output to the I / O interface 71 of the sub-computer 42. In the case of knocking, the sub-computer 42 transmits the signal to the main computer 41 through a serial line via the SCI 70 and 52. The main computer 41 immediately delays the ignition timing of the corresponding cylinder based on the knock data to avoid knocking.

Reference numeral 81 denotes an air conditioner control unit, which is connected to a CPU 82, a ROM 83, a RAM 84, and an I / O interface 85 via a bus line 86.
A stabilized voltage is supplied to each unit from a constant voltage circuit 88 connected to the battery 45 via an ignition switch 87.

An input port of the I / O interface 85 is connected to an air conditioner switch 89 and an I / O interface 53 of the main computer 41. The main computer 41 sends the variable capacity air conditioner to the air conditioner control unit 81. Compressor 64
DUTY signal is output.

The output port of the I / O interface 85 is connected to the variable capacity air conditioner compressor 6.
4 is connected to a variable capacity control valve (not shown) to output a capacity (DUTY) signal, and is connected to an input port of the I / O interface 53 of the main computer 41, so that the air conditioner switch 89 A signal indicating whether the switch has been turned on is output.

[Operation] Next, I of the embodiment having the above configuration will be described.
The control operation of the SC valve 13 will be described.

(ISC Valve Control Main Routine) FIGS. 1 and 2 show a main routine showing an ISC valve control procedure executed by the main computer 41, which is executed at predetermined calculation cycles.

First, step (hereinafter abbreviated as “S”) 101
The battery voltage correction value ISCVB is set based on the monitored battery voltage. If the battery voltage is low, the ISC valve 13 does not reach the predetermined opening, so the battery voltage correction value ISCVB is set to a larger value as the battery voltage is lower.

Then, in S102, an atmospheric pressure correction coefficient KALT is set. Since the intake air flow rate becomes relatively low when the atmospheric pressure is low, the atmospheric pressure correction coefficient KALT is set to a larger value as the atmospheric pressure is lower.

Thereafter, when the operation proceeds to S103, it is determined whether or not the starter switch 61 is ON in order to make a start determination. When the starter switch 61 is ON, it is determined that the engine is being started, and the operation proceeds to S104. When it is OFF, it is determined that the engine is stopped or the engine is operating. To S105.

In S105, it is determined whether or not the engine is stopped based on the engine speed NE detected by the output of the first crank angle sensor 31. If NE = 0 (engine is stopped), S1 is executed.
Proceed to 04 and proceed to S114 if NE ≠ 0 (engine running).

If it is determined in S103 or S105 that the engine is being started or the engine is being stopped, the process proceeds to S104, where a start-time control process is executed. In S104, the starting characteristic value ISCST is set by referring to the starting characteristic value table TISCST with interpolation calculation based on the cooling water temperature TW detected by the cooling water temperature sensor 21.

Then, the program proceeds to S106, in which the starting characteristic value I is set.
The value obtained by adding SCST and the battery voltage correction value ISCVB is multiplied by the atmospheric pressure correction coefficient KALT to obtain an ISC valve 13.
The duty ratio ICON, which is the opening setting value of the ISC valve 13, which is the opening setting value of (ISCON ← (IS
CST + ISCVB) × KALT).

Thereafter, in S107, a post-start elapsed time discrimination count value COU for discriminating whether or not the elapsed time after starting the engine used in a closed / open loop control determination subroutine described later has reached a set time TMASI [SEC].
A set value COUNTST corresponding to the set time TMACI is set in NTST (down counter) (COUNTST ← C
OUNTTMASI), and then proceeds to S108, in which a start / normal control discrimination flag FLAGST used for setting a post-start correction ISCSD and a closed-loop correction I minute ISC _I described later.
Is set (FLAGST ← 1) to indicate that the start-time control is currently being executed, and then the flow proceeds to S109.

In step S109, the duty ratio ISCON is compared with a lower limit value IMINOP during open loop control, and
If SCON ≦ IMINOP, set duty ratio IS
Since CON is equal to or lower than the lower limit, the duty ratio ISCON is set at the lower limit IMINOP in S110 (ISCON
← IMINOP), and proceed to S138.

On the other hand, in S109, ISCON> IMINOP
In step S111, the process proceeds to step S111, where the upper limit value IMAXOP is set by referring to the upper limit value table TBMXOP based on the cooling water temperature TW. The upper limit value table TMXOP stores a high upper limit value IMAXOP because the startability becomes more difficult if the cooling water temperature TW is low.

Then, in S112, the duty ratio ISCON
Is compared with the upper limit value IMAXOP, and ISCON ≧ IMAXOP
In step S113, the process proceeds to step S113, where the duty ratio ISCON is fixed at the upper limit value IMAXOP (ISCON ← IMAXOP), and the process proceeds to step S138. If ISCON <IMAXOP, the process proceeds directly to S138.

On the other hand, if it is determined in step S105 that NE ≠ 0 (the engine is operating), the flow advances to step S114 to execute a normal control process. In S114, the start / normal control discrimination flag FLAGST is cleared (FLAGST ← 0, normal control), and the basic characteristic value setting subroutine (details will be described later) is executed in S115 to set the basic characteristic value ISCTW. And S1
At 16, an idle target rotation speed setting subroutine (described in detail later) is executed to set an idle target rotation speed NSET,
After executing the closed / open loop control determination subroutine (details will be described later) in S117 to determine whether the control is closed loop control or open loop control, the process proceeds to S118.

In S118, the air conditioner correction value ISCAC set in a correction value setting routine (interrupt execution every 51.2 msec) described later is read, and in S119, the AT vehicle running range correction value ISCATDS set in the correction value setting routine is used. The gear position correction value ISCAT used in the main routine is set (ISCAT ← ISCATDS), and the acceleration / deceleration correction value I is set by the acceleration / deceleration correction DSHPT set in the correction value setting routine in S120.
The SCTR is set (ISCTRＤDSHPT), the post-start correction value ICASS is set in S121 by the post-start correction ISCSD set in each interrupt routine to be described later (ISCAS ← ISCSD), and S1 is set.
The dashpot correction value DHENB updated in the correction value setting routine is read in 22 and the main loop is executed in the closed loop correction ISC _I set in the closed loop correction I update procedure (interrupt execution every 10 msec) described later in S123. Closed loop correction value ISCCL used in routine
(ISCCL ← ISC _I ).

Then, the radian correction value ISCRA used in the main routine is set by the radian correction ISCRAS set in the correction value setting routine in S124 (ISCRA ← ISCRAS), and in S125, the radian correction value ISCRAS is set in the correction value setting routine. The set power steering correction value ISCPS is read, and in S126, the air conditioner clutch correction value ISCCLH set in the correction value setting routine is read.

Thereafter, in S127, the basic characteristic value ISCTW,
Air conditioner correction value ISCAC, gear position correction value ISCAT, acceleration / deceleration correction value ISCTR, post-start correction value ISCAS, dashpot correction value DHENB, closed loop correction value IS
CCL, Radifan correction value ISCRA, Power steering correction value IS
The atmospheric pressure correction coefficient KALT is added to the sum of CPS, air conditioner clutch correction value ISCCLH, and battery voltage correction value ISCVB.
And the duty ratio ISCON is set as shown in the following equation.

ISCON ← (ISCTW + ISCAC + ISC
AT + ISCTR + ISCAS + DHENB + ISCCL + IS
CRA + ISCPS + ISCCLH + ISCVB) × KALT A closed / open loop control discrimination flag F which is set to 1 when closed loop control is selected in S128.
Referring to the value of LAGCL, if FLAGCL = and closed-loop control is selected, the process proceeds to S129, where FLAGCL is set.
If the open loop control is selected at = 0, the process returns to S109 to execute the same duty limitation as at the start.

At step S129, the duty ratio ISCON
Is compared with the lower limit value IMINCL at the time of the closed loop control. If ISCON ≦ IMINCL, the routine proceeds to S130, where the duty ratio ISCON is set to the lower limit value IMINCL (ICONL).
SCON ← IMINCL), and proceeds to S138. The lower limit value IMI
In the case of NCL or IMINOP, the duty ratio ISCON is unnecessarily reduced and the opening of the ISC valve 13 is reduced, and
This is set to prevent the feeling from deteriorating and the engine stall due to the decrease in the idle speed due to the decrease in the air flow rate by the C valve 13.

On the other hand, when it is determined in S129 that ISCON> IMINCL and the routine proceeds to S131, the upper limit basic value IMAX is set based on the cooling water temperature TW by referring to the table TBMXCL with interpolation calculation. This upper limit basic value IMAX is the duty ratio ISC
This setting is made to prevent the ON speed from becoming unnecessarily large and the idling speed from becoming excessive. On the table, the higher the cooling water temperature TW, the lower the basic characteristic value ISCTW, and therefore, the duty ratio ISCON Therefore, the upper limit basic value IMAX is stored as the cooling water temperature TW becomes higher.

Then, the process proceeds to S132, where the air conditioner switch 8
It is determined whether or not 9 is ON. If it is ON, the process proceeds to S133, and the upper limit basic value air conditioner correction ID1 is set with the set value ISCBAC (ID1 ← ISCBAC). Is set to 0 (ID1 ←
0).

Then, in S135, the upper limit basic value IMAX is added to the upper limit basic value air conditioner correction ID1 to set the upper limit value IMAXCL (IMAXCL ← IMAX + ID1). The upper limit value IMAXC because the air conditioner is idle when it is running
L is also set higher by the air conditioner correction value ID1.

Then, in S136, the duty ratio ISCON
And the above upper limit value IMAXCL, ISCON ≧ IMAXCL
In the case of, the process proceeds to S137 and the duty ratio ISCON is set to the upper limit value I.
MAXCL is set (ISCON ← IMAXCL), and the process proceeds to S138. If ISCON <IMAXCL, the duty ratio I
SCON is within the allowable range (IMINCL <ISC
ON <IMAXCL), and the process directly proceeds to S138.

Thereafter, when the process proceeds from S110, S113, S130, S136 or S137 to S138, the duty signal DUT corresponding to the duty ratio ISCON set in each of the above steps is obtained.
Y is output to the coil of the ISC valve 13 (DUTY ←
ISCON), exit the routine. The output of the duty signal DUTY for the ISC valve 13 is held until a new duty signal DUTY is set at the next execution of the routine. (Correction value setting routine) FIG.
This is a correction value setting routine that is executed by interruption every 1.2 msec.

First, an air conditioner correction value setting subroutine (details will be described later) is executed in S201 to execute an air conditioner correction value ISCAC.
The AT vehicle travel range correction value setting subroutine (details will be described later) is executed in S202 to set the AT vehicle travel range correction value ISCATDS, and the acceleration / deceleration correction setting subroutine (details described later) is executed in S203. To set the dashpot correction value DSHPT, and execute the dashpot correction value update subroutine (details will be described later) in S204 to execute the dashpot correction value DHE.
The NB is updated, a radial fan correction setting subroutine (details will be described later) is executed in step S205 to set a radial fan correction ISCRAS, and a power steering correction value setting subroutine (details will be described later) is executed in step S206 to set the power steering correction value ISCPS. ,
In S207, the air conditioner clutch correction value setting subroutine (details will be described later) is executed to execute the air conditioner clutch correction value ISCCLH.
And exit the routine.

(Basic characteristic value setting subroutine) FIG. 4 is a basic characteristic value ISCTW setting subroutine executed in the main routine (see S115).
Are set separately for warm-up (parked state) and running warm-up.

First, it is determined whether the vehicle is completely stopped in S301 to S303. In S301, the idle switch 12b is turned on
If it is ON (throttle valves 11d and 11e are fully closed), the process proceeds to S302, and OFF (throttle valve 1
If 1d and 11e are open), the process proceeds to S305.

In S302, the parking switch 60 is turned on.
(The state where the select lever is set to the P range)
If it is OFF, proceed to S303, and if it is OFF, proceed to S305.

In S303, the vehicle speed V detected by the vehicle speed sensor 56
It is determined whether the vehicle speed VSP is 0 based on SP, and VSP = 0.
In the case of (stop state), the process proceeds to S304, and in the case of VSP ≠ 0 (running state), the process proceeds to S305.

In step S304, a leaving / running warm-up discrimination flag FLAGTIS is set (FLAGTIS ← 1, leaving warm-up), and in step S306, the basic warm-up warming characteristic value table TISTWS is referred to with interpolation calculation based on the cooling water temperature TW. After setting the basic characteristic value ISCTW, the routine exits.

The basic characteristic value ISCTW of the warming-up of the warm-up is determined by increasing the opening of the ISC valve 13 by the ISC valve 13 because the transmission is shifted to the P range and the vehicle is completely stopped. The value is set higher than the running warm-up in order to increase the intake air amount, increase the engine speed, and shorten the engine warm-up completion time. Although there is an upper limit in consideration of the fuel consumption rate and feeling, the optimum basic characteristic value ISCTW is determined from experiments and the like using the cooling water temperature TW as a parameter to form a table.
Store in 9

On the other hand, S301, S302, or S303 to S305
In step S307, the flag for leaving / running warm-up flag FLAGTIS is cleared (FLAGTIS ← 0, running warm-up), and in S307, the running warm-up basic characteristic value table TISTWR based on the cooling water temperature TW.
Is set with the interpolation calculation to set the basic characteristic value ISCTW, and then the routine exits.

When the transmission is in the D range (first speed, 2nd speed)
Speed), or in the N range. The optimum basic characteristic value ISCTW at the time of warm-up of the running is obtained by experiments using the cooling water temperature TW as a parameter to prevent accelerator depression and uncomfortable feeling at the time of running. The table is stored in a table, and is set to a value lower than the warm-up time.

(Idle target speed setting subroutine)
FIG. 5 is a subroutine for setting the idle target rotation speed NSET executed in the main routine (see S116).

First, in step S401, the idle / running warm-up discrimination flag F
Referring to the value of LAGTIS, if FLAGTIS = 1 (leaving warm-up), proceed to S402, FLAGTIS = 0 (running warm-up)
In the case of, go to S403.

In S402, the target warm-up rotation speed NSETS is set by referring to the target warm-up rotation speed table TNSETS with interpolation calculation based on the cooling water temperature TW.
After setting the idle target rotation speed NSET stored at a predetermined address in the RAM 50 with the target rotation speed during idle warming NSETS (NSET ← NSETS), the flow proceeds to S406.

The target rotation speed table TNS at the time of the warm-up during the leaving as described above.
The ETS is stored in the ROM 49, and in each area, an optimum target rotation speed NSETS obtained in advance through experiments or the like is stored. During the warm-up period, the transmission is shifted to the P range, and the vehicle is completely stopped. Therefore, in order to reduce the warm-up time, the target rotation speed NSE of each region is reduced.
TS is set to a value higher than a target rotation speed NSETR during traveling warm-up described later.

On the other hand, in step S401, the travel warm-up (FLAGTIS
= 0), and proceeds to S403, based on the coolant temperature TW, refers to the target rotational speed table TNSETR at the time of traveling warm-up with interpolation calculation, sets the target rotational speed NSETR at the time of traveling warm-up, and proceeds to S405. After setting the idle target rotation speed NSET stored at a predetermined address in the RAM 50 to the target rotation speed NSETR at the time of traveling warm-up (NSET ← NSTR), the process proceeds to S406.

The target rotation speed table TNS at the time of running warm-up described above.
The ETR is stored in the ROM 49 and is obtained by calculating the target rotation speed NSETR using the cooling water temperature TW as a parameter, and is set to a value lower than that of the warm-up.

When the process proceeds from S404 or S405 to S406, it is determined whether the neutral switch 59 is OFF (the select lever is set to a position other than the N range).
Proceeding to S407, if the power is ON, the power is not transmitted to the transmission and the load on the engine 1 is not applied, so the process proceeds to S409.

When the operation proceeds to S407, the parking switch 6
0 is OFF (select lever is set other than P range)
The selector lever is in the D range,
It is determined that the engine has been shifted to the first, second, etc. drive ranges and the engine is under load, and the program proceeds to S408, where it is turned on.
In the case of, the select lever has been shifted to the P range,
Since no load is applied to the engine 1, the process proceeds to S409.

When the process proceeds from S407 to S408, the value of the flag for leaving / running warm-up flag FLAGTIS is referred to, and FLAGTIS is referred to.
If = 0 (running warm-up), proceed to S410, FLAGTIS = 1
In the case of (ignition warm-up), jump to S411.

In step S410, since the vehicle is running, the target rotational speed NSET is set to the target rotational speed NSETR set in step S403 to increase the idle target rotational speed NSET by the set value DNAT.
The idle target rotation speed NSET stored at a predetermined address of the RAM 50 is set with the value obtained by adding the AT (NSE
T ← NSETR + DNAT), and proceed to S411.

When the operation proceeds to S411, the air conditioner switch 89 is turned on.
Then, if it is ON, proceed to S412, compare the preset target rotation speed lower limit value DARCON when the traveling range air conditioner is ON with the idle target rotation speed NSET, and set NSET ≦ D
In the case of ARCON, the process proceeds to S413, in which the running range air conditioner ON target speed lower limit value D is a lower limiter for lowering the idle target speed NSET to the air conditioner load.
After setting with ARCON (NSET ← DARCON),
Exit the routine.

Further, in S411, it is determined that the air conditioner switch 89 is OFF, or in S412, NSET> DARCO
If it is determined to be N, the process exits the routine.

On the other hand, when the process proceeds from S406 or S407 to S409, it is determined whether or not the air conditioner switch 89 is ON. When the switch is ON, the process proceeds to S414 and the idle target revolution speed NSET and the preset N, P range air conditioning ON target revolution speed lower limit. Value NARC
ON, and if NSET ≦ NARCON, proceed to S415, and set the idle target rotational speed NSET with the N / P range air conditioner ON target rotational speed NARCON, which is the lower limiter for dealing with the load when the air conditioner is ON. After performing (NSET ← narcon), the routine exits. Also,
If it is determined in S409 that the air conditioner switch 89 is OFF, or if it is determined in S414 that NSET> NARCON,
Exit the routine.

(Closed / Open Loop Control Determination Subroutine) FIG. 6 is executed in the main routine (S117).
This is a closed / open loop control determination subroutine to be performed. First, in S501, the set time TMA after the start is
In order to determine whether or not I has elapsed, the value of the post-start elapsed time determination count value COUNTST is referred to, and if COUNTST = 0, that is, if it is determined that the set time has elapsed after start, S502.
If COUNTST ≠ 0, proceed to S503, count down the elapsed time determination count value COUNTST after starting (COUNTST ← COUNTST-1), and after the engine starts, the set time has not elapsed and the engine speed is still unstable. To select open loop control
The process jumps to S527, clears the closed / open loop control determination flag FLAGCL, and exits the routine.

On the other hand, when the flow proceeds to S502, the idle switch 12
b is ON, and ON (throttle valve 11d,
If 11e is fully closed), the process proceeds to S504, and if OFF (throttle valves 11d and 11e are open), the process jumps to S527 to select open loop control.

When the process proceeds from S502 to S504, it is determined whether the neutral switch 59 is ON.
To determine if the parking switch 60 is ON and ON
If it is OFF, proceed to S509, and if it is OFF, proceed to S506.

In S504 and S505, neutral switch 5
9. Both the parking switch 60 is OFF and the select lever is in a range other than the N range and the P range, that is,
When it is determined that the travel range has been set and the process proceeds to S506, the elapsed time after the neutral switch 59 or the parking switch 60 has been turned ON, that is, after the shift to the P and N ranges has reached the set time ATC [SEC]. Elapsed time determination count value C after shifting to P and N ranges to determine
The set time ATC is set in OUNTAT (down counter).
After setting the set value COUNTATTC corresponding to the following, the routine proceeds to S507, where the vehicle speed VSP detected by the vehicle speed sensor 56 is compared with a preset vehicle speed VSPFBA for discriminating closed / open loop control during running, and if VSP <VSPFBA
Proceed to S508, and if VSP ≧ VSPFBA, proceed to S527 to select open loop control. Then, in S508, the engine speed NE detected based on the output of the first crank angle sensor 31 is compared with a preset closed / open loop control determination engine speed RPMFB, and NE <
If RPMFB, the process proceeds to S513, and if NE ≧ RPMFB, the process proceeds to S527 to select open loop control.

Further, when it is determined that the range is the N range or the P range and the process proceeds from S504 or S505 to S509, the value of the elapsed time determination count value COUNTAT after shifting to the P and N ranges is referred to. , N
After shifting to the range, it is determined that the set time ATC [SEC] has elapsed, and the process proceeds to S510.

On the other hand, if COUNTAT と 0 is determined in S509 and the routine proceeds to S511, the elapsed time determination count value COUNTAT after shifting to the P and N ranges is counted down (COUNT).
AT ← COUNTAT-1), after shifting from the driving range to the P and N ranges, it is estimated that the set time has not elapsed, and that the engine speed has not yet been stabilized due to a sudden change in the engine load, and the flow jumps to S527. Select open loop control.

When COUNTAT = 0 is determined in S509 and the routine proceeds to S510, the vehicle speed VSP detected by the vehicle speed sensor 56 is compared with a predetermined vehicle speed VSOPPA for determining closed / open loop control when the vehicle stops, and VSP ≧ VSPOP.
If A, proceed to S512, compare the engine speed NE with a value obtained by adding the set value NCLOP to the idle target speed NSET set in the above-mentioned idle target speed setting subroutine, and go to S513 if NE <NSET + NCLOP. Proceeds, and if NE ≧ NSET + NCLOP, the process jumps to S527 to select open loop control.

If VSP <VSPOPA in S510, or if NE <NSET + NCLOP in S512, the process proceeds to S513, where the engine speed NE and the value obtained by subtracting the set value DNACF from the idle target speed NSET are calculated. In the case of NE <NSET-DNACF, proceed to S517,
If NE≥NSET-DNACF, the process proceeds to S514. S514
Then, it is determined whether or not the air conditioner switch 89 is OFF. If the air conditioner switch 89 is ON, the air conditioner for determining whether or not the elapsed time after the air conditioner has been turned on → OFF has reached the set time AOFF [SEC] in S515. Elapsed time discrimination count value COUNTA after ON → OFF (Down counter)
The set value COUNT corresponding to the set time AOFF
AOFF is set (COUNTA ← COUNTAOFF), and the process jumps to S527 to execute open loop control because the air conditioner switch 89 is currently ON and air conditioner correction is in transition.

On the other hand, in S514, the air conditioner switch 89 is turned off.
If it is determined to be F and the process proceeds to S516, the air conditioner is turned on → OF.
Referring to the value of the post-F elapsed time determination count value COUNTA, if COUNTA = 0, it is determined that the set time AOFF [SEC] after the air conditioner switch 89 has been turned ON → OFF, and the flow proceeds to S517. If COUNTA ≠ 0, the process proceeds to S518, and the elapsed time determination count value C after the air conditioner is turned ON → OFF is set to C.
Count down COUNTA (COUNTA ← COU
NTA-1), and proceed to S527 to select open loop control.

Then, when proceeding from S513 or S516 to S517, the engine speed NE is subtracted from the idle target speed NSET to obtain a differential rotation ΔN. In S519, the differential rotation ΔN and the set value NDPS are calculated. Compare and if ΔN ≧ NDPS
Proceed to S520, and proceed to S527 if ΔN <NDPS.

At S520, the differential rotation ΔN and the set value D
NFB (however, DNFB ≧ NDPS) and ΔN ≦
In the case of DNFB, the process proceeds to S521, and in the case of ΔN> DNFB, it is determined that the closed loop control condition is satisfied, and the process proceeds to S525. In order to select the closed loop control, the closed / open loop control determination flag FLAGCL is set, and the routine exits.

In S521, referring to the value of the acceleration / deceleration correction DSHPT set in the acceleration / deceleration correction setting subroutine described later, it is determined whether the acceleration / deceleration correction DSHPT is 0 [%].
If DSHPT 0, proceed to S522; if DSHPT ≠ 0, proceed to S523.

When the flow advances to S522, a dashpot correction value DH set in a dashpot correction value setting routine described later.
With reference to the value of ENB, the dashpot correction value DHENB
Is determined to be 0 [%], and if DHENB ≠ 0, proceed to S523; if DHENB = 0, proceed to S524.

At S523, the count value COUNTCL (down) of the steady state shift determination counter for determining whether the state of the acceleration / deceleration correction DSHPT = 0 or the dashpot correction value DHENB = 0 has passed the set time CLSD [sec]. The counter COUNT is set to a set value COUNTCLSD corresponding to the set time CLSD (COUNTCL ← COUNT).
TCLSD), the process proceeds to S527 to select open-loop control because of a transient state in which acceleration / deceleration correction or dashpot correction is currently being performed.

On the other hand, when the processing proceeds from S522 to S524, the value of the steady state transition determination count value COUNTCL is referred to, and COU
If NTCL = 0, it is a steady state, and it is determined that the closed loop control condition is satisfied.
Proceeding to S525, if COUNTCL ≠ 0, proceeding to S526, decrementing the steady state transition determination count value COUNTCL (COUNTCL ← COUNTCL−1), and proceeding to S527.

Then, when the flow advances from S520 or S524 to S525, the closed / open loop control discrimination flag FLAG
CL is set (FLAGCL ← 1, closed loop control is selected), and the routine exits.

Also, S502, S503, S507, S508, S511, S512, S5
15, S518, S519, S523 Alternatively, when the process proceeds from S526 to S527, the closed / open loop control determination flag FLAGCL is cleared (FLAGCL ← 0, open loop control selection).
And exit the routine.

The closed-loop control conditions according to the above-mentioned flowchart are summarized in the following <1> to <7>. Otherwise, open-loop control is performed.

<1> After starting, a predetermined time TMASI [sec]
] <2> Idle switch 12b is ON <3> (i) Neutral switch 59 or parking switch 60 is ON and vehicle speed VSP <VSPOPA
Or (ii) when the neutral switch 59 or the parking switch 60 is ON and VSP ≧ VSPOPA [Km /
h], but the engine speed NE <(NSET + NCL
OP) [rpm] or (iii) the neutral switch 59 or the parking switch 60 is both OFF and the vehicle speed VSP <V
SPFBA [Km / h] and engine speed NE <RPMF
B [rpm] <4> (i) The air conditioner switch 89 is ON, and the air conditioner transient correction value ISCACF = 0 or ISCACFCF0
[%], The engine speed NE <(NNSET−
DNACF) [rpm] or (ii) Air conditioner switch 89 is OFF and ON →
After a predetermined time AOFF [sec] elapses after turning off, or
Engine speed NE <(NSET-DNACF) [rpm]
<5> When the neutral switch 59 or the parking switch 60 is ON, and is OFF → ON for a predetermined time AT
<6> Power Steering Correction Value ISCPS = 0 or ISC
Even if PS ≠ 0 [%], differential rotation ΔN ≧ NDPS [rpm]
<7> (i) All of <1> to <6> are satisfied, and acceleration / deceleration correction DSHPT = 0 [%] and dashpot correction DH
ENB = 0 [%] continues for a predetermined time CLSD [sec], or differential rotation ΔN> DNFB [rpm] even when the predetermined time CLSD [sec] has not continued, or (ii) <1> to <6>, and acceleration / deceleration correction DSHPTＤ0 [%] or dashpot correction D
Even if HENB ≠ 0 [%], differential rotation ΔN> DNFB [rpm
(Air conditioner correction value setting subroutine) FIGS.
This is a subroutine for setting an air conditioner correction value ISCAC that is executed (see S201) in a correction value setting routine that is executed every 1.2 msec.

First, in S601, it is determined whether the neutral switch 59 is ON. If it is OFF, the process proceeds to S602. If it is ON, it is determined that the range is the N range, and the process proceeds to S603.

When the processing advances to S602, the parking switch 60 is turned on.
If it is ON, it is determined that it is the P range and the process proceeds to S603. If it is OFF, it is determined that it is the travel range and the process proceeds to S604.

When the flow advances to S603, the traveling range determination flag FLA
Clear GAT (FLAGAT ← 0, N or P range)
Proceed to S605, and when proceeding to S604, set the running range determination flag FLAGAT (FLAGAT ← 1, running range).
Proceed to S605.

In S605, it is determined whether or not the air conditioner switch 89 is ON. If the air conditioner switch 89 is ON, the process proceeds to S606, and if it is OFF, the process proceeds to S607. In order to determine whether or not a set time AON [sec] has elapsed since the air conditioner switch 89 was turned ON. Of the air conditioner transient correction end determination count value COUNTAC (downtown) of FIG.
Set TAON (COUNTAC ← COUNTAON),
Proceed to S620.

If it is determined in step S605 that the air conditioner switch 89 is ON, and the flow advances to step S606, the count value of the air conditioner transient correction end determination COUNTAC is referenced, and COUNTACＣＯ0.
In case of, set time AO after air conditioner switch OFF → ON
It is determined that N has not elapsed, and the process proceeds to S608.
If NTAC = 0, it is determined that the set time AON has elapsed after the air conditioner switch has been turned OFF → ON, and the flow proceeds to S611.

At S608, the air conditioner transient correction end determination count value COUNTAC is counted down (COU
NTAC ← COUNTAC−1), and proceeds to S609 to compare the engine speed NE with the set upper limit obtained by adding the set value DNAC to the idle target speed NSET, and then NE ≦ NSET + DNAC
In the case of NE, it is determined that the engine speed NE is lower than the set speed, and the routine proceeds to S610. In the case of NE> NSET + DNAC, it is determined that the engine speed NE is higher than the set speed, and S611 is performed.
Proceed to.

When the flow advances to S610, the travel range determination flag FLA
Referring to the value of GAT, if FLAGAT = 1 (running range), proceed to S612, and if FLAGAT = 0 (N or P range), proceed to S613.

When the flow proceeds to S612, the air conditioner transient correction value ISCAC
After setting the initial value of F with the set value ACFFD (ISCAC
F ← ACFFD [%]), and the process proceeds to S616. Further, when the process proceeds to S613, the air conditioner transient correction value ISCACF is set to the set value ACFFN.
After setting the initial value with (ISCACF ← ACFFN
[%]), And proceed to S616. . Note that each of the above set values ACFF
Let D and ACFFN be the first set values.

On the other hand, when the process proceeds from S606 or S609 to S611, it is determined whether the air conditioner transient correction value ISCACF is equal to or less than 0 [%]. ] After setting (I
SCACF ← 0), and proceed to S616. If ISCACF> 0, the air conditioner transient correction value ISCACF is set to a second set value D smaller than the first set values ACFFD and ACFFN.
The air conditioner transient correction value ISCACF is subtracted by ACFF.
Is updated (ISCACF ← ISCACF-DACFF), and S6
Proceed to 16.

When the process proceeds to S616 from any of the above S612 to S615, the value of the travel range discrimination flag FLAGAT is referred to and FL is determined.
If AGAT = 1 (running range), proceed to S617, FLAG
If AT = 0 (P, N range), proceed to S618.

At S617, the air conditioner steady-state correction value ISCAC
After setting S with the third set value ADDTY (ISCACS
← ACCTY), and proceed to S619. In step S618, the air conditioner steady-state correction value ISCACS is stored in the backup RAM 50a.
Air conditioner learning correction value MAC read from the predetermined address of
After setting in DTY (set in the air conditioner correction learning routine to be described later) (ISCACS ← MACDTY), S619
Proceed to.

When the process proceeds from S617 or S618 to S619,
The air conditioner correction value ISC is a value obtained by adding the air conditioner steady-state correction value ISCACS to the air conditioner transient correction value ISC ACF.
Set AC [%] (ISCAC ← ISCACF + ISCACS)
), Exit the routine.

On the other hand, when the process proceeds from S607 to S620, the air conditioner correction value ISCAC is read, and it is determined whether the air conditioner correction value ISCAC is 0% or less. If ISCAC ≦ 0, the process proceeds to S621 and the air conditioner correction value ISCAC is set to 0 [ %] (I
SCAC ← 0), exits the routine.

If ISCAC> 0, the process proceeds to S622, where the air conditioner correction value ISCAC and the set value ISCACD [%] are set.
(A value close to 0%), and if ISCAC ≧ ISCACD, the process proceeds to S623. If ISCAC <ISCACD, the air conditioner correction value ISCAC is close to 0 [%], thereby preventing control hunting and improving convergence. Therefore, the process proceeds to S624 to reduce the subtraction amount.

When the flow advances to S623, the traveling range determination flag FLA
Referring to the value of GAT, if FLAGAT = 1 (driving range), proceed to S626 and set the weight loss value DSAC as the first subtraction value with the set value DSAC1D [%] (DSAC ← DSAC
1D), proceed to S630. If FLAGAT = 0 (P, N range), the process proceeds to S627, where the weight loss value DSAC is set as the first subtraction value with the set value DSAC1N (DSAC ← DS
AC1N), and proceed to S630.

When the process proceeds from S622 to S624, the value of the running range determination flag FLAGAT is referred to, and FLAGAT = 1.
In the case of (running range), proceed to S628 and reduce the weight loss value DSAC to the second
Set value DSAC2D (however, DSAC1
D> DSAC2D) (DSAC ← DSAC2)
D), proceed to S630. If FLAGAT = 0 (P, N range), the process proceeds to S629, in which the set value DSAC2N (where DSAC1N> DS
AC2N) (DSAC ← DSAC2N),
Proceed to S630.

When the process proceeds to S630 from any of S626 to S629, the air conditioner correction value ISCAC is subtracted by the reduced value DSAC (ISCAC ← ISCAC-DSAC), and the routine exits.

FIG. 29 shows a typical example of the above air conditioner correction value setting.
Will be described according to the time chart of FIG.

When the air conditioner switch 89 is set from OFF to ON, the air conditioner correction value ISCAC is set to a preset air conditioner steady-state correction value IS for a set time AON [sec].
CACS (ACDTY or MACDTY) and air conditioner transient correction value ISCACF (ACFFD or A
CFFN) (elapsed time t1 to
t2) During the set time AON [sec], the engine speed NE is controlled so as to approach the engine speed obtained by adding the set value DNAC to the idle target speed NSET.

That is, if the air conditioner correction value ISCAC is set to a value that does not include the air conditioner transient correction value ISC ACF, immediately after the air conditioner switch 89 is turned on, a load due to driving of the air conditioner compressor is suddenly applied to the engine. As shown by the broken line in c), the engine speed greatly fluctuates and the feeling deteriorates.

Therefore, the air conditioner switch 89 is turned on.
Then, during the set time AON, the air conditioner transient correction value ISCAC
By increasing the air conditioner correction value ISCAC by F
Increase the duty ratio ISCON for the valve 13,
By increasing the opening of the ISC valve 13 to increase the amount of air, it is possible to prevent the engine speed NE from dropping due to a sudden increase in load caused by driving the air conditioner compressor immediately after the air conditioner switch is turned on. As shown, a stable feeling can be obtained.

When the set time AON [sec] has elapsed, the air conditioner transient correction value ISCACF is decreased by the set value DACFF in each calculation cycle until the value becomes 0 (elapsed time t2 to t3). In this way, by gradually decreasing the air conditioner transient correction value ISCACF with time, the engine speed NE is reduced to the idling-up speed when the air conditioner is driven.
Can be shifted smoothly.

Thereafter, the air conditioner switch 89 is turned off.
When F (elapsed time t4), the above air conditioner correction value ISC
AC is set value DS as the first subtraction value for each operation cycle
The air conditioner correction value ISCAC is decreased by AC1D or DSAC1N until the set value ISCACD is reached.

When the air-conditioner correction value ISCAC reaches the set value ISCACD (elapsed time t5), the air-conditioner correction value ISCAC is set as a second subtraction value smaller than the first subtraction value for each operation cycle. DSAC
Decrease the amount to 2D or DSAC2N until it becomes 0.

That is, when the air conditioner switch 89 is turned from ON to OFF, if the air conditioner correction value ISCAC is suddenly set to 0, the air conditioner switch is turned ON → OFF, especially since the variable capacity air conditioner compressor 64 is used.
Air conditioner clutch relay 65 is still ON within a predetermined time after that
(Connection), and the load on the engine driven by the air conditioner compressor remains due to the air conditioner capacity control, so that the engine speed drops as shown by the broken line in FIG.

After the air conditioner switch 89 is turned off,
When the above air conditioner correction value ISCAC is reduced with the weight reduction value remaining large, ISCAC = 0 as shown by the dashed line in FIG.
The convergence of the engine speed NE in the vicinity is deteriorated.

Therefore, the air conditioner switch 89 is turned off.
Thereafter, the air conditioner correction value ISCAC is reduced by a first subtraction value in each calculation cycle until the air conditioner correction value ISCAC decreases to the set value ISC ACD, and the air amount is gradually reduced by gradually reducing the opening of the ISC valve 13. To prevent the engine speed from dropping due to the friction from the air conditioner compressor 64 remaining immediately after the air conditioner switch 89 is turned off. After that, when the air conditioner correction value ISCAC drops below the set value ISACCD, the air conditioner correction value is reduced. The ISCAC is reduced by a second subtraction value smaller than the first subtraction value at each calculation cycle until it becomes 0, and the air conditioner correction value I is reduced.
By reducing the rate of decrease of the duty ratio ISCON set using SCAC to decrease the rate of decrease of the opening of the ISC valve 13, the idle target rotation speed N when the air conditioner is turned off is set.
The convergence of the engine speed NE to the target speed is improved by reducing the rate of decrease of the engine speed NE when approaching SET.

(Air Conditioner Correction Learning Routine) FIG. 9 is a routine for executing an interrupt when the air conditioner switch 89 is turned from OFF to ON. First, in step S101, the value of the closed / open loop control discrimination flag FLAGCL is referred to, and FLAGCL = 1.
In case of (closed loop control), proceed to S702, FLA
If GCL = 0 (during open loop control), the flow proceeds to S707.

In S702, the current closed loop correction ISC _I set in a closed loop correction I update routine described later is read and stored as a current feedback control value MISCI at a predetermined address of the RAM 50 (MISCI ← ISC). _I ) Timer TIMER in S703
Start LRN and turn on air conditioner switch 89 in S704
N is determined, and if ON, proceed to S705; if OFF, S7
Go to 07. In S705, the value of the closed / open loop control discrimination flag FLAGCL is referred to, and FLAGCL = 1
In the case of (closed loop control), proceed to S706, FLA
If GCL = 0 (during open loop control), the flow proceeds to S707.

When the flow advances to S706, the timer TIMERLRN is compared with a preset time TACLRN, and TIME is set.
If RLRN≥TACLRN, it is determined that the air conditioner switch 89 is ON and the set time has elapsed during the closed loop control, and the process proceeds to S708, where TIMERLRN <TA
In the case of CLRN, the process returns to S704.

On the other hand, from S701, S704 or S705
When proceeding to S707, the timer TIMERLRN is reset (TIM
After ELRRN ← 0), exit the routine.

When the flow advances to S708, the timer TIMER
After resetting LRN (TIMERLRN ← 0), the current ISC _I for the closed loop correction _I is read in S709,
It is stored in a predetermined address of the RAM 50 as the feedback control value LISCI after the lapse of the set time TACLRN.

Then, the flow advances to S710, where the backup RAM is used.
The air conditioner correction learning value MACDTY stored at the predetermined address of 50a is updated with the value obtained from the following equation, and the process exits.

MACDTY ← MACDTY + [(LIS
CI-MISCI) × KACON] KACON: I-rate transfer rate FIG. 10 is a routine for executing an interrupt when the air conditioner switch 89 is turned ON → OFF. First, in S801, the value of the closed / open loop control discrimination flag FLAGCL is referred to, and F
If LAGCL = 1 (during closed loop control), proceed to S802. If FLAGCL = 0 (during open loop control), exit the routine.

At S802, the feedback control value MISCI (the value when the air conditioner switch 89 is turned from OFF to ON) stored at a predetermined address in the RAM 50 is read out, and S8 is executed.
In step 03, the current closed loop correction ISC _I is read and stored as a current feedback control value LISC _{I at} a predetermined address in the RAM 50 (LISCI ← IS
C _I ).

Then, the flow advances to S804, where the backup RAM is used.
The air conditioner correction learning value MACDTY stored at the predetermined address of 50a is updated with the value obtained from the following equation, and the process exits.

MACDTY ← MACDTY + [(LIS
CI−MISCI) × KACON] As described above, when the air conditioner is ON and the closed loop control is being performed, the feedback control value MISCI at that time is used.
And then the same condition (during closed loop control and the air conditioner switch 89 is ON) is set for the set time TACL
When the air conditioner correction learning MACDTY is set based on the difference from the feedback control value LISCI when the RN continues, the air conditioner correction value ISCAC in the P and N ranges is set in the aforementioned air conditioner correction value setting subroutine.
By using the air conditioner correction learning value MACDTY as the air conditioner steady-state correction value ISCACS, the aging of the ISC valve 13 and the like can be compensated, and a predetermined idle-up can always be performed when the air conditioner is turned on. Since the engine load is relatively large in the traveling range as compared with the N and P ranges, the influence of the deterioration of the ISC valve 13 is small, and therefore, it is not necessary to use the learning correction value.

Further, the air conditioner switch 89 is turned OFF → O
By executing not only the interrupt at the time of N but also the interrupt at the time of ON → OFF, the air conditioner correction learning value MACDTY set in the interrupt routine executed when the air conditioner switch 89 is turned OFF → ON and the previous OFF → ON. The deviation from the air conditioning correction learning value MACDTY set at the time can be compensated.

(AT Vehicle Travel Range Correction Value Setting Subroutine) FIGS. 11 and 12 show an AT executed in a correction value setting routine interrupted every 51.2 msec (see S202).
This is a subroutine for setting a vehicle travel range correction value ISCATDS.

First, the running range discrimination flag FLA set in the air conditioner correction value setting subroutine described above in S901.
Referring to the value of GAT, if FLAGAT = 1 (running range), proceed to S902; if FLAGAT = 0 (P, N range)
Proceed to S903.

In S902, the running range shift determination count value COUNTAT1 corresponding to the delay time ISCAT1 [sec] at the time of shifting from the P, N range to the running range set in S913 described later is set to the value of the (down counter). With reference to COUNTAT1 = 0, the process proceeds to S904. further,
If COUNTAT1 ≠ 0, the process proceeds to S905, and the running range shift determination count value COUNTAT1 is counted down (COUNTAT1 ← COUNTAT1 −1), and the process proceeds to S908.

In step S902, the travel range state (neutral switch 59 and parking switch 60 are both turned off).
FF) continued for more than the delay time ISCAT1 (COUN
(TAT1 = 0) and proceeds to S904, the AT vehicle travel range correction value I stored at a predetermined address in the RAM 50 is determined.
Compare SCATDS with the set increase value DRGDTY,
If ATDS ≧ DRGDTY, the routine proceeds to S906, where the AT vehicle travel range correction value ISCATDS is set to the set increase value DRGDTY.
(ISCATDS ← DRGDTY), and the process proceeds to S908. If ISCATDS <DRGDTY, the routine proceeds to S907, where the AT vehicle travel range correction value ISCATDS is set to the set value DL.
The AT vehicle travel range correction value ISCATDS is set to a value obtained by adding TAT1 (however, DLTAT1 <DRGDTY) (ISCATDS ← ISCATDS + DLTAT1), and S908
Proceed to.

Then, from S905, S906, or S907
Proceeding to S908, the set value CO corresponding to the delay time ISCAT2 [sec] when shifting from the travel range to the N and P ranges
Count value COU for N, P range shift determination in UNTISCAT2
Set NTAT2 (down counter) (COUNT
AT2 ← COUNTISCAT2), exit the routine.

On the other hand, in S901, the N and P ranges (FLAGAT =
0) and the process proceeds to S903, referring to the N, P range shift determination count value COUNTAT2, and
If 2 ≠ 0, proceed to S909, and count value COUNTAT
Count down 2 (COUNTAT2 ← COUNT
AT2-1), proceed to S913.

When it is determined in step S903 that COUNTAT2 = 0, the flow proceeds to step S910, where the AT vehicle travel range correction value I
Judge whether SCATDS is 0 or less, and if ISCATDS> 0, S9
Proceed to 11 to set the AT vehicle travel range correction value ISCATDS with a value obtained by subtracting the set value DLTAT2 from the AT vehicle travel range correction value ISCATDS (ISCATDS ← ISCATDS-D).
LTAT2), and proceed to S913. If ISCATDS ≦ 0, the routine proceeds to S912, where the AT vehicle traveling range correction value ISCATDS is set to 0 [%] (ISCATDS ← 0), and the routine proceeds to S913.

Then, from S909, S911, or S912
Proceeding to S913, the running range shift determination count value CO with the set value COUNTISCAT1 corresponding to the delay time ISCAT1 [sec] when shifting from the N, P range to the running range.
After setting UNTAT1 (COUNTAT1 ← COUN
TISCAT1), exit the routine.

A representative example of the setting of the AT vehicle running range correction value will be described with reference to the time chart of FIG.

When shifting from the N and P ranges (FLAGAT = 0) to the running range (FLAGAT = 1) (elapsed time t
1) The clocking of a predetermined delay time ISCAT1 [sec] is started, and after the delay time ISCAT1 [sec], a small set value DLTAT1 [%] is added for each operation cycle (ISCATDS ← ISCATDS + DLTAT1), and the AT vehicle is started. The travel range correction value ISCATDS [%] is the set value DRGDT
When Y [%] is reached (elapsed time t2), the AT vehicle travel range correction value ISCATDS [%] is changed to the set value DRGDT.
It is fixed at Y [%] (elapsed time t2 to t3).

When shifting from the N and P ranges to the driving range, the load is applied to the engine with a small delay time, so that the AT vehicle driving range correction value ISCATDS is immediately changed from 0 to 0.
When the set value DRGDTY [%] is set, the engine speed NE temporarily increases as shown by the broken line in FIG.

If the AT vehicle travel range correction is not performed, the engine load is suddenly applied when shifting from the N, P range to the travel range, and the engine speed decreases as shown by the two-dot chain line in FIG. Thus, it takes time for the engine speed to converge due to the closed loop correction ISC _I.

Therefore, when shifting to the driving range,
Predetermined delay time I corresponding to transmission delay time of engine load
After SCAT1 has elapsed, the AT vehicle travel range correction value ISCATDS
Is gradually increased until the set value DRGTY is reached.
By gradually increasing the duty ratio ISCON set using the vehicle travel range correction value ISCATDS and gradually increasing the air amount by the ISC valve 13, fluctuations in the engine speed are prevented and the feeling is improved.

On the other hand, when shifting from the running range (FLAGAT = 1) to the N, P range (FLAGAT = 0) (elapsed time t3), the counting of a predetermined delay time ISCAT2 [sec] is started, and the delay time ISCAT2 [sec] is started. After the elapse, the AT vehicle travel range correction value ISCATDS is decremented by a small amount set value DLTAT2 [%] in every operation cycle until it becomes 0 (ISCATDS ← ISCATDS-DLTAT2, elapsed time t4).

When the vehicle shifts from the driving range to the N and P ranges, the engine load suddenly decreases with a small delay time. Therefore, if the AT vehicle driving range correction value ISCATDS is immediately set to 0, the load on the engine on the transmission side is completely reduced. , The engine speed temporarily decreases and the feeling deteriorates as shown by the broken line in FIG.

If the AT vehicle travel range correction is not performed, when the travel range is shifted from the travel range to the N or P range, the engine load is sharply reduced. Therefore, as shown by the two-dot chain line in FIG. A blow-up occurs and the feeling deteriorates.

Therefore, when shifting to the N and P ranges, after the predetermined delay time ISCAT2 has elapsed, the AT vehicle traveling range correction value ISCATDS is gradually reduced until it becomes 0 [%], and the duty ratio ISCON is gradually reduced, thereby reducing the ISC. By gradually reducing the amount of air by the valve 13, the fluctuation of the engine speed at this time is prevented, and the feeling is improved.

(Acceleration / deceleration correction setting subroutine)
FIG. 14 shows the acceleration / deceleration correction DSH executed in the correction value setting routine interrupted every 51.2 msec (see S203).
This is a PT setting subroutine.

First, in S1001, it is determined whether or not the idle switch 12b is OFF.
If the throttle valve is in the open state (11e is open), the flow proceeds to S1002, and if it is ON (the throttle valves 11d and 11e are fully closed), the flow proceeds to S1003.

When the flow advances to S1002, the travel range determination flag FL
Refer to the value of AGAT, FLAGAT = 0 (N, P range)
In the case of, the process proceeds to S1004, and in the case of FLAGAT = 1 (running range), the process proceeds to S1005.

At S1004, the throttle opening sensor 12
ROM 49 based on the throttle opening THV detected in step a.
After setting the acceleration / deceleration correction DSHPT [%] by referring to the N / P range acceleration / deceleration correction table TDASHN stored at a series of addresses with interpolation calculation, the process proceeds to S1006.

When the flow advances from S1002 to S1005, the travel range acceleration / deceleration correction table TD stored in a series of addresses in the ROM 49 based on the throttle opening THV is stored.
Acceleration / deceleration correction DSHP with reference to ASHD with interpolation calculation
After setting T [%], the process proceeds to S1006.

When the select lever is shifted to the N range or the P range, no load is applied to the engine, and when the throttle valves 11d and 11e are opened, racing, air blowing, etc. are performed. The change in the engine speed NE according to the degree change is larger than in the travel range.

Accordingly, the acceleration / deceleration correction DSHPT corresponding to the throttle opening THV stored in each area of the N / P range acceleration / deceleration correction table TDASHN is based on the acceleration / deceleration correction table T for the travel range employed in the travel range.
The value is set to a value larger than the acceleration / deceleration correction DSHPT stored in the DASHD, so that controllability according to the engine load can be obtained.

Then, S1004 or S1005 to S1006
When the process proceeds to (3), the current acceleration / deceleration correction (DSHP
T) Set NEW ((DSHPT) NEW ← DSHP
T).

Thereafter, when the flow proceeds to S1007, the current acceleration / deceleration correction (DSHPT) NEW is compared with the acceleration / deceleration correction (DSHPT) OLD set in the previous routine.
If (PT) NEW <(DSHPT) OLD (throttle opening decreases), proceed to S1008, where (DSHPT) NEW ≧ (DS
HPT) OLD (Throttle opening increase or no change)
In the case of, jump to S1030.

At S1008, the travel range determination flag FL
Refer to the value of AGAT, FLAGAT = 0 (N, P range)
If so, proceed to S1009; if FLAGAT = 1 (running range), proceed to S1010.

At S1009, the set value DDASHN is used to set the weight reduction value DDASH [%] (DDASH ← DDAS).
HN), and proceed to S1011. When the process proceeds to S1010, the set value D
Set the weight loss value DDASH [%] in DASHD (where DDASHN> DDASHD) (DDASH ← DDA
SHD), and proceed to S1011.

It should be noted that the decrease in the engine speed when the throttle opening is reduced is smaller than in the traveling range in the no-load state.
Because the P range is quicker, (DSHPT) NEW <
The deceleration value DDASH of the acceleration / deceleration correction value DSHPT at the time of (DSHPT) OLD is set larger than the travel range at the time of the N and P ranges.

Then, when the flow proceeds to S1011, the acceleration / deceleration correction value DSHPT is set to a value obtained by subtracting the above-mentioned reduced value DDASH from the previous acceleration / deceleration correction (DSHPT) OLD (DSHPT).
← (DSHPT) OLD-DDASH).

On the other hand, the idle switch 12
When it is determined that b is ON and the throttle is in the fully closed state and the process proceeds to S1003, the value of the travel range determination flag FLAGAT is referred to, and
If FLAGAT = 0 (N, P range), proceed to S1012,
If FLAGAT = 1 (running range), proceed to S1013.

At S1012, the set value NDASHN [%]
To set the offset value NDASH (NDASH ← ND
ASHN), and when the processing proceeds to S1013, the set value NDASHD is set.
(However, NDASHN> NDASHD) [%] sets the offset value NDASH (NDASH ← NDASH).
D), and then proceed to S1014, respectively.

Then, when the flow advances to S1014, the engine speed N
The offset value ND is added to E and the target idle speed NSET.
Compare with the value obtained by adding ASH, and NE ≧ NSET + NDA
If SH, proceed to S1015, and if NE <NSET + NDASH, proceed to S1016.

At S1015, the running range determination flag FL
Refer to the value of AGAT, FLAGAT = 0 (N, P range)
In step S1017, the process proceeds to step S1017, where the dashpot holding value RDASH is set with a preset set value RDASHN [%] (RD
ASH ← RDASHN), and if FLAGAT = 1 (running range), proceed to S1018 and hold the dashpot holding value RD
ASH is set by a preset set value RDASHD [%] (RDASH ← RDASHD), and thereafter, the process proceeds to S1019.

Then, when the flow advances to S1019, the current acceleration / deceleration correction DSHP stored at a predetermined address in the RAM 50 is reached.
T, the acceleration / deceleration correction DSHPT is compared with the dashpot holding value RDASH, and DSHPT ≦ RD
In the case of ASH, proceed to S1020, and set the acceleration / deceleration correction DSHPT with the dashpot holding value RDASH (DSH
PT ← RDASH), and the process proceeds to S1030.

If it is determined at step S1019 that DSHPT> RDASH and the process proceeds to step S1021, the travel range determination flag FLA is set.
Referring to the value of GAT, if FLAGAT = 0 (N, P range), proceed to S1022, and if FLAGAT = 1 (running range), proceed to S1023.

When the flow advances to S1022, the set value DDSH1N [%]
To set the first weight loss value DDSH1 (DDSH1 ← DD
SH1N), and if it proceeds to S1023, the set value DDSH1D
(However, DDSH1D <DDSH1N) [%] sets the first weight loss value DDSH1 (DDSH1 ← DDSH1).
D), and then proceed to S1024 respectively.

Then, when the flow advances to S1024, the acceleration / deceleration correction DSH is performed.
After setting the acceleration / deceleration correction DSHPT with a value obtained by subtracting the first weight loss value DDSH1 from PT (DSHPT ← D
SHPT-DDSH1), proceed to S1030.

On the other hand, in S1014, NE <NSET + NDASH
When the process proceeds to S1016, it is determined whether the acceleration / deceleration correction DSHPT is equal to or less than 0. If DSHPT ≦ 0, the process proceeds to S1025, and the acceleration / deceleration correction DSHPT is fixed at 0 (DSHPT ←
After 0), proceed to S1030. If DSHPT> 0, the process proceeds to S1026.

At S1026, the running range determination flag F is set.
With reference to the value of LAGAT, if FLAGAT = 0 (N, P range), proceed to S1027, and if FLAGAT = 1 (running range), proceed to 1028.

At S1027, the second weight loss value DDSH2 is set with the set value DDSH2N (where DDSH1N> DDSH2N) [%] (DDSH2 ← DDSH2N), and
When the process proceeds to S1028, the set value DDSH2D (however, DD
SH1D> DDSH2D) [%] and the second weight loss value DDS
Set H2 (DDSH2 ← DDSH2D), and set
Proceed to S1029.

In S1029, after the acceleration / deceleration correction DSHPT is set to a value obtained by subtracting the second amount of decrease DDSH2 from the acceleration / deceleration correction DSHPT (DSHPT ← DSHPT-D).
DSH2), proceed to S1030.

The first and second weight loss values DDSH1, DD
Each set value DDSH1N, DDSH2 for setting SH2
N, DDSH1D, DDSH2D, DDSH1N> DD
By setting SH2N, DDSH1D> DDSH2D, when the engine speed NE when the throttle is fully closed falls to the idle target speed NSET, if the engine speed NE approaches the idle target speed NSET, the acceleration / deceleration correction DS is set.
By making the reduction value with respect to the HPT small, the convergence of the engine speed NE to the target idle speed NSET is improved, and control hunting can be prevented.

Then, S1007, S1011, S1020, S1024, S1025
Alternatively, when proceeding from S1029 to S1030, S1004, S1005, S1
011, S1020, S1024, S1025, or the previous acceleration / deceleration correction (DSHPT) OLD stored at a predetermined address of the RAM 50 is updated with the acceleration / deceleration correction DSHPT set in S1029 ((DSHPT) OLD ← DSHPT), and the routine is executed. Through.

A typical example of the above-described acceleration / deceleration correction setting will be described with reference to the time chart of FIG.

The idle switch 12b changes from ON (throttle valves 11d and 11e are fully closed) to OFF (throttle valves 11d and 11e are open) (elapsed time t1).
In an acceleration operation in which the throttle opening THV gradually increases, the engine speed NE increases in accordance with the throttle opening THV. At this time, the acceleration / deceleration correction DSHPT set based on the throttle opening THV rises in each calculation cycle, and the duty ratio ICON of the ISC valve 13 is set by taking in the acceleration / deceleration correction DSCPT (ISCTR).
And the opening of the ISC valve 13 is increased (elapsed times t1 to t2 and t3 to t4).

In a steady operation in which the throttle opening THV is substantially constant, the acceleration / deceleration correction DSHPT is constant (elapsed times t2 to t3 and t4 to t5).

When the throttle valves 11d and 11e are suddenly closed, the pressure in the intake pipe rapidly decreases, and the fuel adhering to the intake port 4 and the inner wall surface of the intake manifold 5 is sucked into the combustion chamber at a stretch. The air-fuel ratio is over-rich due to a decrease in the intake air amount due to the rapid closing of the throttle valves 11d and 11e. However, when the throttle valves 11d and 11e are closed (elapsed time t5).
), The acceleration / deceleration correction DSHPT is set according to the throttle opening THV.
By setting the PT and the duty ratio ISCON to be large, the opening of the ISC valve 13 is secured in proportion to the throttle opening THV, and the throttle valves 11d, 11
After the shift to the closing of e, the acceleration / deceleration correction DSHPT is applied to the throttle valves 11d and 11e until the idle switch 12b is turned on (throttle fully closed) (elapsed time t5 to t6).
Is reduced by the set value DASHH every calculation cycle (51.2 msec) regardless of the valve closing speed. During this time, the ISC valve 13 secures the air amount, compensates for the decrease in the intake pipe pressure, and compensates for the air-fuel ratio. Over-rich is prevented. This prevents misfires and abnormal combustion caused by air-fuel ratio over-rich immediately after the throttle valve suddenly closes,
Exhaust emissions are improved.

Since the acceleration / deceleration correction DSHPT at the time of shifting from the throttle open state to the throttle fully closed state is set to a value corresponding to the throttle opening THV, the dashpot period after the shift to the throttle fully closed state is shorter. Always obtained properly.

When the idle switch 12b is turned on, the acceleration / deceleration correction DSHPT is applied to the dashpot holding value RDASH at the first reduction value DDSH1 every calculation cycle.
(However, DDASH>DDSH1> DDSH2) is decremented (elapsed time t6 to t7). As a result, the reduction rate of the acceleration / deceleration correction DSHPT becomes relatively large when the throttle is fully closed, and the return time to the target rotational speed is reduced.

Thereafter, when the acceleration / deceleration correction DSHPT reaches the dashpot holding value RDASH, this value is maintained until the engine speed NE decreases to a value obtained by adding the offset value NDASH to the idle target speed NSET ( When the engine speed NE becomes lower than the value obtained by adding the offset value NDASH to the idle target speed NSET during the elapsed time t7 to t8), the first decrease value is obtained until the engine speed NE reaches the idle target speed NSET. The acceleration / deceleration correction DSHPT is subtracted by a second decrease value DDSH2 smaller than DDSH1 for each calculation cycle (after the elapsed time t8).

As a result, the idle switch 12b is turned on.
Thereafter, until the engine speed NE reaches the idle target speed NSET, the decreasing rate of the duty ratio ISCON set by using the acceleration / deceleration correction DSHPT decreases gradually, and the decreasing rate of the opening degree of the ISC valve 13 also decreases sequentially. Become smaller.
As a result, the rate of decrease of the engine speed NE when approaching the idle target speed NSET is reduced, engine stall is prevented, and the convergence of the engine speed NE to the idle target speed NSET is improved.

(Dashpot Correction Value Setting Routine) FIG. 15 shows a dashpot correction value setting routine that is executed by interruption every set time, for example, every 100 msec.

First, in S1101, it is determined whether or not the idle switch 12b is ON.
If e is fully closed), the flow proceeds to S1102, and if OFF (throttle valves 11d and 11e are open), the flow proceeds to S1104.

In S1102, the engine speed NE is compared with a preset dashpot determination engine speed DHEKN.
If NE <DHEKN, proceed to S1103, and NE ≧ DHEK
If N, proceed to S1104. The dashpot determination rotational speed DHEKN is a value near the idle rotational speed (for example, 1900 rpm) in consideration of idle-up such as air conditioner correction.

When the process proceeds from S1101 or S1102 to S1104, the dashpot correction value DHENB is set to 0 (DHEN).
After B ← 0), the flow proceeds to S1113.

When the flow advances from S1102 to S1103, the engine speed (NE) OLD set at the time of execution of the previous routine (100 msec before) and stored at a predetermined address in the RAM 50 is read, and at S1105, the previous engine speed (NE) is read. ) Set time (100msec) from the difference between OLD and current engine speed NE
) Is calculated (NDOWN ← (NE) OLD−NE).

Then, at S1106, the engine speed reduction amount NDOWN is compared with the set value DNES1, and NDOWN <DN
In the case of ES1, proceed to S1107, and set the engine speed reduction amount discrimination flag FLAGDH indicating that the engine speed reduction amount is small (slow deceleration) (FLAGDH ← 1).
Then, the process proceeds to S1114.

When it is determined in step S1106 that NDOWN ≧ DNES1, the routine proceeds to step S1108, where the engine speed reduction amount NDO is determined.
WN and set value DNES2 (However, DNES1 <DNES
2), and if NDOWN <DNES2, the process proceeds to S1109 and sets the dashpot correction value DHENB to the set value DHNEB.
Set with 1 [%] (DHENB ← DHNEB1), S111
Proceed to 3. If NDOWN ≧ DNES2, the process proceeds to S1110.

In S1110, the engine speed reduction amount N
DOWN and set value DNES3 (however, DNES2 <DNES
3), and if NDOWN <DNES3, the process proceeds to S111 and sets the dashpot correction value DHENB to the set value DHNEB2.
(However, DHNEB1 <DHNEB2) [%] is set (DHENB ← DHNEB2), and the process proceeds to S1113. Also,
If NDOWN ≧ DNES3, the process proceeds to S1112, where the dashpot correction value DHENB is set to the set value DHNEB3 (however, DHN
EB2 <DHNEB3) [%] and set (DHENB ←
DHNEB3), and proceed to S1113.

The above S1104, S1109, S1111, S1112 to S1113
When the routine proceeds to (1), the engine rotational speed decrease amount determination flag FLAGDH is cleared (FLAGDH ← 0, the decrease amount is large), and the routine proceeds to S1114.

Then, S1107 or S1113 to S1114
When the process proceeds to step S3, the current engine speed NE is stored at a predetermined address in the RAM 50 at the previous engine speed (N
E) Update OLD ((NE) OLD ← NE) and exit the routine.

FIG. 16 shows a dashpot correction value update subroutine executed (see S204) in a correction value setting routine interrupted every 51.2 msec.

First, in S1201, the value of the engine rotational speed decrease amount discrimination flag FLAGDH is referred to. If FLAGDH = 1 (lower decrease amount), the process proceeds to S1202, and if FLAGDH = 0 (lower decrease amount), the routine exits.

When the flow advances to S1202, the dashpot correction value DH
It is determined whether ENB [%] is equal to or less than 0, and if DHENB ≦ 0, the process proceeds to S1203 and the dashpot correction value DHENB is set to 0.
After setting to [%] (DHENB ← 0), the routine exits.

When it is determined in S1202 that DHENB> 0, and the flow advances to S1204, the dashpot correction value DHEN is set.
The dashpot correction value DHENB is updated with a value obtained by subtracting the set value DDFEB (small value) from B (DHENB).
← DHENB-DDFEB) and exit the routine.

FIG. 32 is a time chart showing a typical example of setting a dashpot correction value.

At the time of sudden deceleration due to sudden closing of the throttle valves 11d and 11e, the idle switch 12b shifts from the OFF state to the ON state (the throttle valves 11d and 11e are fully closed) and the engine speed NE sharply decreases. ,
Dashpot determination rotation speed DHEKN (for example, 1900 rp)
m) or less and the engine speed reduction amount NDOWN is relatively large (DNES3 ≦ NDOWN) (elapsed time t1 to t).
In 2), the dashpot correction value DHENB is set with the large set value DHNEB3 [%].

If the dashpot correction is not performed when the engine speed NE suddenly drops, the engine speed drops and stalls as shown by the broken line in the figure. Therefore, when the engine speed NE suddenly drops below a set value DHEKN (for example, 1900 rpm) near the idle speed when the throttle valves 11d and 11e shift from the open state to the fully closed state, the engine speed By increasing the dashpot correction value DHENB as the decrease amount NDOWN (= (NE) OLD-NE) of the ISC valve 13 is increased, the duty ratio ISCON for the ISC valve 13 is increased, and the opening of the ISC valve 13 is increased to increase air. Increase the amount to prevent the engine speed NE from dropping.

Thereafter, the engine speed reduction amount NDOWN is calculated as follows:
Section of DNES2 ≦ NDOWN <DNES3 (elapsed time t2
In t3), the dashpot correction value DHENB is set at the intermediate set value DHNEB2 [%].

Next, the engine speed reduction amount NDOWN is calculated as follows:
Section of DNES1 ≦ NDOWN <DNES2 (elapsed time t3
To t4), a relatively small set value DHNEB1
The dashpot correction value DHENB is set in [%].

If the dashpot correction value DHENB is kept at the set value DHNEB3 even when the engine speed reduction amount NDOWN is relatively small, rotation fluctuation occurs as shown by a dashed line in FIG. Convergence deteriorates.

The engine speed reduction amount NDOWN
However, in the section of NDOWN <DNES1 (after the elapsed time t4), the dashpot correction value DHENB is reduced by a small set value DDFEB in the calculation cycle (51.2 msec) until it becomes zero.

That is, when the dashpot correction value DHENB is set to 0 at the elapsed time t4, the ISC valve 13
, The engine speed NE drops as shown by the broken line in the figure, and the convergence to the idle speed deteriorates. Accordingly, the dashpot correction value DHENB is reduced in accordance with the decrease in the decrease amount NDOWN of the engine speed NE to improve the convergence to the idle speed.

(Radio fan correction setting subroutine) FIG.
7 is a radial fan correction ISC executed in a correction value setting routine that is executed every 51.2 msec (see S205).
This is a RAS setting subroutine.

First, in S1301, the main computer 41
It is determined whether the radiator fan relay 63 for controlling the operation of the radiator fan 62 is ON based on the data in the
If it is ON, proceed to S1302; if it is OFF, proceed to S1303.

When the flow advances to S1302, the radial fan correction ISCRAS stored at a predetermined address in the RAM 50 is set to the set value R.
Set with AS [%] (ISCRAS ← RAS) and exit the routine. In addition, the process proceeds to S1303, where
Set SCRAS to 0 [%] (ISCRAS ← 0) and exit the routine.

FIG. 33 is a time chart showing the setting of the above-mentioned radian correction ISCRAS.

When the radiator fan 62 is operating, a large current is consumed by the radiator fan motor.
Since the amount of power generated by the alternator (generator) also increases, the load on the engine 1 increases accordingly and the engine speed NE tends to decrease. However, when the radiator fan 62 is ON, the duty with respect to the ISC valve 13 is reduced. The ratio ICON is increased by the radial fan correction ISCRAS, and the opening of the ISC valve 13 is increased to prevent the engine speed NE from lowering. (Power Steering Correction Value Setting Subroutine) FIGS.
This is a subroutine for setting a power steering correction value ISCPS, which is executed (see S206) in a correction value setting routine that is executed every 51.2 msec. The power steering correction value ISCPS set in this subroutine is for compensating that the turning angle is large and the load on the engine 1 that drives the power steering oil pump increases, and the engine speed NE decreases.

First, at step S1401, a power steering turning switch (hereinafter abbreviated as "power steering turning switch") 58
Is determined to be ON, the process proceeds to S1402 if ON (the steering angle is large), and proceeds to S1409 if OFF (the steering angle is small).

At S1402, the vehicle speed VSP detected by the vehicle speed sensor 56 is compared with the set value VSPPS [Km / h], and
If P ≦ VSPPS, proceed to S1403; if VSP> VSPPS, proceed to S1409.

In S1403, the cooling water temperature T W detected by the cooling water temperature sensor 21 is compared with a set value T WPS [° C].
If TW ≧ TWPS, proceed to S1404, if TW <TWPS
Proceed to S1409.

At S1402, when the vehicle speed VSP is equal to or higher than the set value VSPPS, the engine load for driving the power steering oil pump is relatively small because the engine load due to traveling is large. Therefore, the power steering correction value IS
Eliminates the need for CPS compensation. In S1403, when the warm-up is not completed (TW <TWPS), the basic characteristic value I
Since the SCTW is set to be large, the engine load for driving the power steering oil pump is relatively reduced, and the compensation by the power steering correction value ISCPS becomes unnecessary.

In S1404, the value of the idle speed discrimination flag FLAGPS set to 1 when the engine was idling at the time of execution of the previous routine is referred to as FLAGPS = 1.
In the case of (last idle state), proceed to S1405, and FLAGPS
If = 0 (previous idle release state), the process proceeds to S1406.

When the flow advances to S1405, the set value ISPSN [rpm
] To set the idle discrimination rotational speed ISPSN (ISP
SN ← ISPSNH), and proceeds to S1407. Further, when the process proceeds to S1406, the set value ISPSNNL (however, ISPSNNL <IS
(PSNH) [rpm] to set the idle discrimination rotational speed ISPSN (ISPSN ← ISPSNL), and proceed to S1407.
As shown in FIG. 34, by setting hysteresis in the idle state (FLAGPS = 1) and the idle release state (FLAGPS = 0) when setting the idle determination rotation speed ISPSN, control hunting of the idle state determination in S1407 is prevented. I am trying to do it.

In S1407, the engine speed NE is compared with the idling speed ISPSN, and NE> ISPS.
In the case of N, it is determined that the idle is released, and the process proceeds to S1408, where the idle speed discrimination flag FLAGPS is cleared (FLAGPS
After ← 0), go to S1409. If NE ≦ ISPSN, it is determined that the engine is in the idle state, and the flow advances to S1410.

In step S1410, the air conditioner switch 89 is turned off.
If it is OFF, proceed to S1411; if it is ON, S1
Proceed to 412.

In S1411, the main computer 41
Duty ratio IS for ISC valve 13 calculated by
Based on CON, power steering correction value IS when air conditioner is off
The CPS is set by referring to the table or by calculation, and S1413
Proceed to. Further, when the process proceeds to S1412,
Duty ratio IS for ISC valve 13 calculated by
Power steering correction value ISCPS when air conditioner is ON based on CON
Is set by referring to the table or by calculation, and the process proceeds to S1413.

As shown in FIG. 35 (b), the power steering correction value ISCPS when the air conditioner is turned off indicated by a solid line is set to be larger than the power steering correction value ISCPS when the air conditioner is turned on indicated by a dashed line. That is, when the air conditioner is ON, the duty ratio ISCON is set to be large by the air conditioner correction value ISCAC, so that the engine load due to power steering is relatively reduced, and therefore, the power steering correction value ISCPS is set smaller than when the air conditioner is OFF.

The power steering correction value ISCPS set in S1411 or S1412 is such that when the duty ratio ISCON is large (small), the load on the engine 1 is large (small) and the opening of the ISC valve 13 is large (small). Although the air amount is increased (decreased) to prevent the engine speed NE from decreasing (increased), the load by the power steering pump is relatively small (large) with respect to the total load applied to the engine at this time. Therefore, it is set small (large).

Then, from S1411 or S1412 to S1
In 413, the idle speed discrimination flag FLAGPS is set (FLAGPS ← 1), and the routine exits.

Also, S1401, S1402, S1403, or S140
When the process proceeds from S8 to S1409, it is determined whether the power steering correction value ISCPS is equal to or less than 0. If ISCPS ≦ 0, the process proceeds to S1414, and the power steering correction value ISCPS is set to 0 [%] (ISCPS ←
0), exit the routine. S141 if ISCPS> 0
Proceed to 5 to change the power steering correction value ISCPS to the set value DISC.
After the power steering correction value ISCPS is updated by subtracting PS (ISCPS ← ISCP-DISCPS), the routine exits.

FIG. 35 shows a typical time chart for setting the power steering correction value.

When the steering angle is large and the power steering switch 58 is turned on during idling after the completion of warm-up, the power steering correction value ISCPS according to the duty ratio ISCON (the difference between when the air conditioner switch 89 is off and when it is on) Is set (elapsed time t1).

As a result, when the power steering oil pump driving load increases with a large turning angle, the power steering correction value IS
Duty ratio IS for ISC valve 13 by CPS
By increasing CON and increasing the opening of the ISC valve 13 to increase the amount of air, a drop in the engine speed is prevented.

Also, immediately after the power steering switch 58 is switched from ON to OFF (elapsed time t2), the power steering correction value ISCPS is immediately set to 0 [%]. Ratio ISC
Since ON is rapidly decreased by the power steering correction value ISCPS and decreased, but the power steering oil pump driving load is present, the engine speed N as shown by the two-dot chain line in FIG.
E fluctuates greatly, but the power steering correction value IS
Until CPS becomes 0, the power steering correction value ISCPS is subtracted by the set value DISCSP every calculation cycle (51.2 msec), thereby gradually decreasing the opening of the ISC valve 13 to compensate for the air amount. The fluctuation of the engine speed NE is prevented as shown by the solid line in FIG.

(Air Conditioner Clutch Correction Value Setting Subroutine) FIG. 20 is a subroutine for setting the air conditioner clutch correction value ISCCLH executed in the correction value setting routine interrupted every 51.2 msec (see S207). First, in S1501, it is determined whether the air conditioner switch 89 is ON.
If it is ON, proceed to S1502; if it is OFF, proceed to S1503.

At S1502, the air conditioner switch 89 is turned on.
The count value COUNTCLH (down counter) for determining the elapsed time after turning ON / OFF the air conditioner for determining whether the set time TCLH [SEC] after N → OFF has elapsed is set by the set value TACCLH corresponding to the set time TCLH (C
OUNTCLH ← TACCLH), and proceeds to S1505.

In addition, when the processing proceeds to S1503, the air conditioner is turned on → OF.
With reference to the value of the elapsed time determination count value COUNTCLH after F, if COUNTCLH ≠ 0, the process proceeds to S1504, and after counting down (COUNTCLH ← COUNTCLH−1), the process proceeds to S1505.

When the process proceeds from S1502 or S1504 to S1505, the air conditioner clutch correction value ISCCLH is set to the set value DISCL.
After setting in H [%] (ISCCLH ← DISCLH),
Exit the routine.

On the other hand, in S1503, COUNTCLH1 = 0, and after the air conditioner switch 89 is turned from ON to OFF, it is determined that the predetermined time TCLH [SEC] has elapsed, and the process proceeds to S1506. After setting (ISCCLH ← 0), exit the routine.

FIG. 36 shows the air conditioner clutch correction value IS.
Setting of CCLH and ON / OF of air conditioner switch 89
F, ON / OFF of the air conditioner clutch relay 65, displacement control of the variable displacement air conditioner compressor 64, and the relationship with the engine speed NE.

First, the variable capacity air conditioner compressor 64
Is described below. Air conditioner switch 8
When 9 is turned on, the main computer 41 turns on the air conditioner clutch relay 65 after the set delay time ACENT (for example, 0.3 sec) has elapsed, connects the magnet clutch 64a of the variable capacity air conditioner compressor 64, drives the compressor 64, and A compressor capacity (DUTY) signal is output from the air conditioner control unit 81 to the compressor 64 in accordance with the required capacity signal from the computer 41, and the capacity of the compressor 64 is reduced to the minimum capacity (MI
N) to the set capacity. When the air conditioner switch 89 is turned off, the compressor capacity (DUT
Y) The signal causes the capacity of the compressor 64 to gradually decrease to the minimum capacity (MIN). After the air conditioner switch 89 is turned off, a sufficient time for which the capacity of the air conditioner compressor 64 can be considered to have reached the minimum capacity (MIN) AC
After a lapse of CLTM (for example, 8 seconds), the air conditioner clutch relay 65 is turned off.

Therefore, at the same time when the air conditioner switch 89 is turned on (elapsed time t1), the air conditioner clutch correction value IS
Set CCLH to the set value DISCLH and set ISC valve 1
3 is increased by the air conditioner clutch correction amount ISCCLH to increase the opening degree of the ISC valve 13 and increase the amount of air, thereby increasing the engine speed NE and turning on the air conditioner clutch relay 65.
To prevent a decrease in the engine speed due to an increase in the engine load driven by the compressor 64.

Thereafter, when the air conditioner switch 89 is turned off (elapsed time t2), the capacity of the variable capacity air conditioner compressor 64 is gradually reduced, and the above-described air conditioner correction value ISCAC is gradually reduced (FIGS. 7, 8 and 9). 29), the duty ratio ICON with respect to the ISC valve 13 decreases, and the ISC valve 1
3, the air amount decreases and the engine speed N
E is returned to the target rotation speed when the air conditioner is turned off.

From the time when the capacity of the variable capacity air conditioner compressor 64 is reduced (elapsed time t3), the time until the magnet clutch 64a is disengaged (the air conditioner clutch relay 65).
During the period T1 until the clutch turns off), the friction of the clutch remains. For this reason, at the moment when the magnet clutch 64a of the variable capacity air conditioner compressor 64 is disengaged, the friction caused by the clutch suddenly disappears.
As shown by a broken line in FIG. 4, a rotation fluctuation due to a temporary increase in the rotation speed occurs, and the feeling is deteriorated. The air conditioner clutch correction is for compensating the engine load due to the friction of the clutch. After the air conditioner switch 89 is turned on, the air conditioner switch 89 is turned off.
Thereafter, after the set time ACCLTM has elapsed, the air conditioner clutch relay 65 is turned off, and the variable capacity air conditioner compressor 64 is turned off.
Until the magnetic clutch 64a is completely disengaged, that is, after the air conditioner switch 89 is turned off, the set time TC
Until LH [SEC] (TCLH> ACCLTM) has elapsed, the air conditioner clutch correction value ISCCLH is set to DI
SCLH is set to increase the duty ratio ISCON for the ICS valve 13 during this time.
When the air conditioner clutch correction ISCCLH is set to 0 when a is disengaged, the moment the air conditioner clutch 64a is disengaged, the friction due to the clutch disappears and the engine load is reduced, so that ICON is reduced and the opening of the ISC valve 13 is reduced. The amount of air is reduced to prevent rotation fluctuation at this time. As a result, as shown by the solid line in FIG. 7E, the rotation fluctuation due to the temporary increase in the rotation speed immediately after the air conditioner clutch 64a is disengaged is eliminated, and the feeling is improved.

(Post-Start Correction Setting Interrupt Routine) FIG.
Is a post-start correction initial value setting routine that executes an interrupt when the start / normal control discrimination flag FLAGST set in the ISC valve control main routine changes from 1 to 0.

Start / normal control discrimination flag FLAGST
From FLAGST = 1 (startup control) to FLAGST = 0
(Normal control), that is, the starter switch 61 is changed from ON to OFF, and the engine speed N
When an interrupt is started immediately after the start-time control when E is NE ≠ 0, first, in S1601, a post-start correction initial value table TISCSD based on the cooling water temperature TW (a larger value is stored as the cooling water temperature TW is lower). Is referenced with interpolation calculation to set the initial value of the post-start correction ISCSD. Next, in S1602, the post-start correction update interrupt time is referred to by interpolation calculation with reference to the post-start correction update interrupt time table TTDISC (the longer the lower the cooling water temperature TW is, based on the cooling water temperature TW). Set TDISC.

Then, in step S1603, an interrupt for each post-start correction update interrupt time TDISC is permitted, and the routine exits.

FIG. 22 is a post-start correction setting routine which is executed every interruption time of the post-start correction update interrupt, and improves the connection of the duty ratio ISCON from the start control to the normal control to improve the startability. It is.

First, in S1701, it is determined whether the post-start correction ISCSD stored at a predetermined address in the RAM 50 is 0 or less. If ISCSD> 0, the flow advances to S1702 to proceed to S1702.
SCSD is updated with the value obtained by subtracting the set value DISCSD (I
(SCSD ← ISCSD-DISCSD), and exit the routine.

On the other hand, in S1701, it is determined that ISCSD ≦ 0,
In S1703, the post-start correction ISCSD stored at a predetermined address in the RAM 50 is fixed to 0 [%] (IS1703).
CSD ← 0), proceed to S1704, and start correction update interrupt time T after start
Disable interrupts for each DISC and exit the routine.

A typical example of the post-start correction setting will be described with reference to the time chart of FIG.

When the starter switch 61 is turned on, or
When the engine speed NE is 0 (start / normal control discrimination flag FLAGST = 1), the start-up switch 61 does not execute the post-start correction program (elapsed time t0 to t1).
Immediately after ON → OFF, and the engine speed NE is NE ≠ 0
At this time, the initial value of the post-start correction ISCSD is set (elapsed time t1).

Then, the set value DIS is set for each post-start correction update interrupt time TDISC until the post-start correction ISCSD becomes zero.
Decrease by CSD.

FIG. 38 shows the relationship between the change in the duty ratio ISCON for controlling the ISC valve 13 and the post-start correction ISCSD.

At the time of start-up control (FLAGST = 1), the duty ratio ISCON set in the main routine of the ISC valve control is set to a relatively large value. Since the control is precisely performed by the correction term, the connection of the duty ratio ISCON is deteriorated as shown by the one-dot chain line in the figure, and the startability is reduced.

The post-start correction ISCSD is for compensating for this, and the duty ratio ISCON set in the start control is mostly based on the starting characteristic value ISCST set based on the cooling water temperature TW. Since the starting characteristic value ISCST is set to be larger as the cooling water temperature TW is lower (see FIG. 1), the step of the duty ratio ICON with respect to the ISC valve 13 at the time of transition from the starting control to the normal control becomes larger.

For this reason, the lower the cooling water temperature TW is, the more the FIG.
As shown by the solid line in FIG. 7, the initial value of the post-start correction ISCSD is set to be large, and the post-start correction ISCSD is set to be long to increase the time until the post-start correction ISCSD becomes 0 (elapsed time t1). T3) On the other hand, as the cooling water temperature TW becomes higher, the post-start correction ISCSD as shown by the broken line in FIG.
Is small, and the post-start correction interrupt time TDISC is set short to shorten the time until the post-start correction ISCSD becomes 0 (elapsed time t1 to t2). Duty ratio ICON to ISC valve 13 when shifting from start-up control to normal control
38 is smoothed as shown by the solid line in FIG.
The sudden change of the air flow rate by the C valve 13 is prevented, and the startability is improved.

(Closed-loop correction I-minute update routine) FIGS. 23 to 25 are flowcharts showing a closed-loop correction I-minute update procedure executed by interruption every set time, for example, every 10 msec.

First, in S1801, the value of the start / normal control discrimination flag FLAGST set in the ISC valve control main routine is referred to. If FLAGST = 1 (at start or during engine stall), the flow advances to S1802, and FLAGST = 0
In the case of (normal time), the process proceeds to S1803.

In step S1802, a normal control shift time discrimination count value COUNTSTI (down counter) for judging whether or not a set time LRNISS [SEC] has elapsed since the shift to the normal operation (normal control) after the start is obtained. A set value COUNTLRNISS corresponding to the set time LRNISS is set (COUNTSTI ← COUNTLRNISS), the flow proceeds to S1858, the closed loop correction I minute ISC _I is set to 0 [%], and the flow proceeds to S1859. Further, when the processing proceeds to S1803, the value of the normal control transition time discrimination count value COUNTSTI is referred to, and if COUNTSTI ≠ 0, after transition to the normal control, it is determined that the set time LRNISS has not elapsed and S1 is determined.
Proceeding to 804, the count value COUNTSTI is counted down (COUNTSTI ← COUNTSTI -1), and S1805 is executed.
Proceed to. On the other hand, if COUNTSTI = 0, it is determined that the set time has elapsed since the shift to the normal control, and the flow proceeds to S1805.

In S1805, the cooling water temperature TW and the set temperature L
RNITW [° C.], and if TW ≧ LRNITW, proceed to S1806; if TW <LRNITW, proceed to S1810. When the process proceeds to S1806, the value of the start / normal control discrimination flag (FLAGST) OLD read during the previous routine execution is referred to, and if (FLAGST) OLD = 1 (at the time of previous routine execution, start control), normal operation is performed. To judge the control transfer first time and to initialize ISC _I for closed loop correction I
Proceed to 1807. If (FLAGST) OLD = 0, proceed to S1810.

In S1807, it is determined whether or not the air conditioner switch 89 is ON. If the air conditioner switch 89 is ON, the process proceeds to S1808, and if it is OFF, the process proceeds to S180.
Go to 9.

When the flow advances to S1808, the backup RAM 50a
Learning value ACON when the air conditioner is ON stored in
Read Te closed loop correction I portion ISC _I a I initialized at I minute learning value ACONI during air conditioner ON, also, the process proceeds to S1809, closed loop correction I min ISC
I is initialized with the I-minute learning value ACOFFI when the air conditioner is OFF stored in the backup RAM 50a, and the process proceeds to S1810.

Each of the above-mentioned I-minute learning values ACONI, ACOFF
I is updated in a closed loop correction I-based learning value learning subroutine described later and stored at a predetermined address in the backup RAM 50a.
Only once immediately after 1 has changed from ON to OFF (from start-up control to normal control), the closed-loop correction I-minute ISC based on the I-minute learning value ACONI or ACOFFI learned during the previous engine operation according to the air conditioner operating state.
Initialize I. This allows closed loop correction I
The minute ISC _I is immediately compensated, and the startability is improved.

Then, when the flow advances to S1810, the value of the closed / open loop control determination flag FLAGCL set in the closed / open loop control determination subroutine described above is referred to. If FLAGCL = 1 (closed loop control), the flow advances to S1811 to execute FLAGCL. = 0 (open loop control), the process proceeds to S181 without updating the correction amount ΔI described later.
Proceed to 2.

In S1811, it is determined whether the post-start correction is being performed (ISCSD ≠ 0) by referring to the value of post-start correction ISCSD. If ISCSD ≠ 0, the flow proceeds to S1813, and if ISCSD = 0, the flow proceeds to S1817. . In S1813, the cooling water temperature TW is compared with the set temperature TWAS [° C.]. If TW ≧ TWAS (warm-up completed), the flow proceeds to S1814, where TW <TWAS (during warm-up).
In the case of, go to S1817. In S1814, the vehicle speed VSP is compared with the set value VSAS [Km / h], and VSP <VSAS
If (stop), the process proceeds to S1815, and if VSP ≧ VSAS (running), the process proceeds to S1817.

[0286] Thereafter, the process proceeds when the closed-loop correction in the I min value obtained by adding the after-start correction ISCSD to ISC _I update the above-mentioned closed-loop correction I portion ISC _I to S1815 (IS
C _I ← ISC _I + ISCSD), the process proceeds to S1816, and the post-start correction ISCSD is set to 0 to the extent that the post-start correction ISCSD is shifted to the closed-loop correction I portion (ISC
SD ← 0), and proceed to S1817.

As shown in FIGS. 39A and 39B, when the open-loop control is shifted to the closed-loop control, the post-start correction ISCSD (ISCAS) is not shifted to the closed-loop correction ISC _I. Until the closed loop correction ISC _I converges, a step in the duty ratio ISCON occurs, and the engine speed NE fluctuates. As a countermeasure, it is conceivable to increase a correction amount ΔI described later. However, when the correction amount ΔI is extremely increased, convergence deteriorates and hunting occurs in the engine speed NE.

On the other hand, as shown in FIGS. 39 (c) and (d), when the predetermined condition is satisfied (TW ≧ TWAS and VS
P <VSAS), when the control is shifted from the open loop control to the closed loop control, the post-start correction ISCSD (ISCA
When S) is ISCSD ≠ 0, the correction ISCSD (IS
Since the CAS) and is shifted to the closed loop correction I portion ISC _I, closed loop correction I portion ISC by increments
_The compensation is made by _I , and the connection from the open loop control to the closed loop control is improved, and the fluctuation of the engine speed NE at this time is prevented.

Thereafter, when the routine proceeds from S1811, S1813, S1814 or S1816 to S1817, the idling target engine speed NSE
The difference rotation ΔN between T and the engine speed NE is obtained (ΔN ←
NSET-NE), and proceeds to S1818 to determine whether the air conditioner switch 89 is ON. If ON, proceed to S1819; if OFF, proceed to S1820.

In S1819, the differential rotation ΔN and the set value N
IH3 (NIH3 <0), and if ΔN ≦ NIH3, the process proceeds to S1826, where the correction amount ΔI is set to the set value TIPTAH3.
(TIPTAH <0) (ΔI ← TIPTAH
3) Go to S1845.

If ΔN> NIH3 in S1819, the process proceeds to S1821, and the differential rotation ΔN and the set value NIH2 are set.
(Where NIH3 <NIH2 <0), and ΔN ≦
In the case of NIH2, the process proceeds to S1827 and the correction amount ΔI is set to the set value TI.
PTAH2 (however, TIPTAH3 <TIPATAH2
<0> (ΔI ← TIPTAH2), and the process proceeds to S1845. If ΔN> NIH2, the process proceeds to S1822 and the differential rotation Δ
N and set value NIH1 (however, NIH2 <NIH1 <0)
When ΔN ≦ NIH1, the process proceeds to S1828, where the correction amount ΔI is set to the set value TIPTAH1 (where TIPTAH2 <
Set by TIPTAH1 <0) (ΔI ← TIPTAH
1) Go to S1845.

When it is determined in step S1822 that ΔN> NIH1 and the flow advances to step S1823, the difference rotation ΔN is compared with 0, and ΔN
If ≦ 0, proceed to S1829 and set the correction amount ΔI to the set value TIPTA
H (however, TIPTAH1 <TIPTAH, TIPAT
H = 0 [%]) (ΔI ← TIPTAH), and S184
Proceed to 5. If ΔN> 0, the process proceeds to S1824. S182
4, the differential rotation ΔN and the set value NIL1 (where 0 <N
IL1), and if ΔN ≦ NIL1, the process proceeds to S1830, where the correction amount ΔI is set to the set value TIPTAL (however, TIPT
AH ≦ TIPATL) (ΔI ← TIPTA
L), proceed to S1845. If ΔN> NIL1, S182
Proceed to 5.

At S1825, the differential rotation ΔN and the set value NI
L2 (where NIL1 <NIL2), and ΔN ≦
In the case of NIL2, the process proceeds to S1831, and the correction amount ΔI is
L1 (however, TIPTAL <TIPTAL1) is set (ΔI ← TIPTAL1), and the process proceeds to S1845. Also, ΔN
If> NIL2, proceed to S1832 and set the correction amount ΔI to the set value TI.
PTAL2 (however, TIPTAL1 <TIPTAL2)
(ΔI ← TIPTAL2), and the process proceeds to S1845.

FIG. 40 shows the relationship between the correction amount ΔI and the difference rotation ΔN. As can be seen from the figure, if the differential rotation ΔN is small, the correction amount ΔI is set small. Thereby, the convergence of the engine speed NE to the idle target speed NSET is improved.

On the other hand, in S1818, the air conditioner switch 89
Is determined to be OFF and proceeds to S1820, the S1820, S183
3 to S1837, the differential rotation ΔN and the set values NIH3, N
IH2, NIH1, 0, NIL1, and NIL2 are compared in the same manner as described above, and it is determined in S1820 that ΔN ≦ NIH3 and S1
When the process proceeds to 838, the correction amount ΔI is set by the set value TIPRTH3 (where TIPRTH3 <0) (ΔI ← TIPRT).
H3), proceed to S1845. In S1833, it is determined that ΔN ≦ NIH2, and when the flow proceeds to S1839, the correction amount ΔI is set to the set value TIPRTH.
2 (however, TIPRTH3 <TIPRTH2 <0) is set (ΔI ← TIPRTH2), and the process proceeds to S1845.

In S1834, it is determined that ΔN ≦ NIH1, and S184
When the process proceeds to 0, the correction amount ΔI is set to the set value TIPRTH1 (however,
Set by TIPRTH2 <TIPRTH1 <0) (ΔI
← TIPRTH 1), proceed to S1845.

At S1835, it is determined that ΔN ≦ 0, and the routine proceeds to S1841, where the correction amount ΔI is set to the set value TIPRTH (however, TIPRTH
TH1 <TIPRTH, TIPRTH = 0 [%]) is set (ΔI ← TIPRTH), and the process proceeds to S1845.

In S1836, it is determined that ΔN ≦ NIL1, and S184
2, the correction amount ΔI is changed to the set value TIPRTL (however, T
(IPRTH ≦ TIPRTL) (ΔI ← TIPR)
TL), proceed to S1845.

In S1837, it is determined that ΔN ≦ NIL2 and S184
When the process proceeds to 3, the correction amount ΔI is set to the set value TIPRTL1 (however,
Set by TIPRTL <TIPRTL1 (ΔI ← TI
PRTL1), proceed to S1845. In S1837, ΔN> N
If it is determined that IL2 and the process proceeds to S1844, the correction amount ΔI is set to the set value TIPRTL2 (where TIPRTL1 <TIPRT1).
L2) (ΔI ← TIPRTL2), and the process proceeds to S1845.

Then, S1826 to S1832 or S183
8 to S1844, the process proceeds to S1845.
Closed loop correction I portion ISC _I The closed loop correction I portion ISC _I that of being stored in a predetermined address
Is updated with a value obtained by adding the correction amount ΔI set in any of S1826 to S1832 and S1838 to S1844 (ISCI ← I
SC _I + ΔI), the process proceeds to S1846.

FIG. 41 is a time chart showing the relationship between the fluctuation of the engine speed NE relative to the target idle speed NSET, the correction amount ΔI and the closed loop correction ISC _I.

[Elapsed time t0 to t1] Since the engine speed NE is higher than the set value NIH3 with respect to the idle target speed NSET (ΔN ≦ NIH3), the engine speed NE is set.
Correction amount ΔI is set to the minimum set value TIPTAH3 to reduce
Is set by (S1826).

As a result, the closed loop correction I component IS
CI becomes lower by the set value TIPTAH3, and the duty ratio ISCON for the ISC valve 13 is correspondingly reduced.
, The opening of the ISC valve 13 decreases, and the engine speed NE decreases.

[Elapsed time t1 to t2] Next, the differential rotation Δ
When N falls between the set values NIH3 and NIH2, the correction amount ΔI is set at the set value TIPTAH2 (S1827),
The closed loop correction ISC ISC _I is the set value TIPTA
It becomes even lower by H2.

[Elapsed time t2 to t3] Then, the differential rotation Δ
When N falls between the set values NIH2 and NIH1, the correction amount ΔI is set to the set value TIPAH1 (S1828), and the closed-loop correction I minute ISC _I is set to the set value TIPTHA.
One minute, the engine speed NE decreases. When the differential rotation ΔN falls between the set values NIH1 and 0, the correction amount ΔI is set at the set value TIPTAH (0 [%]) (S1829).
The minute ISC _I does not change.

Thereafter, the differential rotation ΔN is set to 0 and NIL1.
Is smaller than the set value TIPTAL (T
IPTAH ≦ TIPTAL is set (S1830).

[Elapsed time t3 to t4] Next, the differential rotation Δ
When N falls between the set values NIL1 and NIL2, the correction amount ΔI is set at the set value TIPTAL1 (S1831), and the closed-loop correction I minute ISC _I is set at the set value TIPT.
It becomes higher by AL1 minute.

[Elapsed time t4 to t5] Thereafter, when the engine speed NE becomes lower than the set value NIL2 with respect to the idle target speed NSET (ΔN> NIL2), the correction amount Δ
I is set to the set value TIPTAL2 (S1832), and the closed loop correction I ISCI is set to the set value TIPTA.
It becomes higher by L2.

[Elapsed time t5 to t6] Also, the differential rotation ΔN
Is smaller than the set values NIL2 and NIL1, the correction amount Δ
I is set at the set value TIPTAL1 (S1831), and the closed loop correction I minute ISC _I is set at the set value TIPTAL1.
Only get higher.

Then, the differential rotation ΔN is equal to the set values NIL1 and N
Since the set values TIPTAL and TIPTAH are 0 [%] during the period between the values IH1 and IH1, the closed-loop correction ISC _I does not change.

[After the elapsed time t6] On the other hand, when the differential rotation ΔN falls between the set values NIH1 and NIH2, the correction amount ΔI
Is set at the set value TIPTAH1, and thereafter, the differential rotation Δ
N converges between the set values NIH1 and NIL1, and the correction amount ΔI is set to the set values TIPTAL and TIPTAH (both are 0
[%]), The closed loop correction I component ISC _I is constant.

In S1845, the closed loop correction I component I
After setting the SC _I, the process proceeds to S1846, (details below) closed loop correction I portion of the learning subroutine is executed.

Next, in S1847, the value of the normal control shift time discrimination count value COUNTSTI is referred to, and COUNTST
If I 場合 0 (within the set time LRNISS after start) S1848
The process proceeds to S1850 if COUNTSTI = 0.

In S1848, a preset warm-up completion judgment value LRNI for judging whether to restart the warm-up and the cooling water temperature TW.
If TW ≧ LRNITW (warm-up restart), the flow proceeds to S1849, and if TW <LRNITW (engine cold state), the flow proceeds to S1850. Proceeding to S1849, and compares the closed loop correction I portion ISC _I and the lower limit value IMINBL, the process proceeds to S1853 if the ISC _I ≦ IMINBL, the closed loop correction I portion ISC _I the lower limit IMI
Set with NBL and proceed to S1859.

On the other hand, if it is determined in S1849 that ISC _I > IMINBL, the flow advances to S1851 to compare the above closed-loop correction I component ISC _I with the upper limit value IMAXBL.
_{If I} ≧ IMAXBL, the process proceeds to S1854, where the closed loop correction I component ISC _I is set to the upper limit value IMAXBL, and the process proceeds to S1859. If ISC _I <IMAXBL, it is determined that the closed-loop correction I component ISC _I is within the allowable range (IMAXBL> ISC _I > IMINBL), and the process directly proceeds to S1859.

Also, S1847 or S1848 to S185
0, the closed loop correction I
_I is compared with a value (lower limit value) obtained by subtracting the basic characteristic value ISCTW set in the basic characteristic value setting subroutine from the duty limit lower limit value IINCL set in the aforementioned ISC valve control main routine, and ISC _I ≤ ( IMIN
In the case of CL-ISCTW, the process proceeds to S1855, and the closed-loop correction ISC _{I is set} to the lower limit (IMINCL-IS).
CTW) (ISC _I ← IMINCL-ISCTW),
Proceed to S1859.

In S1850, ISC _I > (IMINCL−
In the case of (ISCTW), the process proceeds to S1852, where the closed loop correction ISC _I is compared with a value (upper limit) obtained by subtracting the basic characteristic value ISCTW from the duty limit upper limit IMAXCL set in the ISC valve control main routine. ISC
_{If I} ≧ (IMAXCL−ISCTW), proceed to S1856,
The closed loop correction I minute ISC _I is set at the upper limit value (IMAXCL−ISCTW) (ISC _I ← IMAXCL).
-ISCTW), and proceed to S1859. In S1852, ISC _I <(I
MAXCL-ISCTW), the closed-loop correction ISC _I is within the allowable range (IMINCL-ISCTW) <
It is determined that ISC _{I is} smaller than (IMAXCL−ISCTW), and the process proceeds directly to S1859.

Duty ratio I for ISC valve 13
The majority of SCON is the basic characteristic value ISCTW, and the lower limit value for the correction term other than the basic characteristic value ISCTW is set by subtracting the basic characteristic value ISCTW from the duty limit lower limit value IMINCL.
Is subtracted from the basic characteristic value ISCTW to set the upper limit value.

However, <1> after starting, a predetermined time LRNIS
If it is within S [sec] (S1847), and <2> the warm-up completion judgment value LRN for judging whether the cooling water temperature TW and the warm-up are to be restarted.
If ITW is TW ≧ LRNITW (S1848), it is determined that warm-up is to be restarted, and IMINBL ≦ ISC _I ≦ IMAXBL regardless of open loop or closed loop control.

When the control is shifted to the normal control at the restart of the warm-up, when the closed-loop correction ISC _I is initially set (S1808 or S1809), the closed-loop correction ISC ISC _I has a small value (negative value). Learning value A)
CONI (when the air conditioner switch 89 is ON) or a learning value ACOFFI (when the air conditioner switch 89 is OFF)
If it is updated at (F), the engine speed NE will decrease, and if it is significant, it will stall. Therefore, the upper limit value and the lower limit value are set to the set values IMINBL and IMAX, respectively.
As the BL, the upper limit and the lower limit of the closed loop correction ISC ISC _I are shifted up to improve the restartability (see FIG. 41 (c)).

On the other hand, if it is determined in step S1810 that FLAGCL = 0 (open loop control) and the flow advances to step S1812, the cooling water temperature TW and the set value TWCL [° C.] for determining whether the cooling water temperature TW during open loop control is low water temperature. And TW ≦ T
In the case of WCL, proceed to S1857, and in the case of TW> TWCL,
Proceed to S1847.

[0322] Proceeding to S1857 refers to the value of closed-loop correction I portion ISC _I, the process proceeds to S1858 case of ISC _I <0, after the above-mentioned closed-loop correction I portion ISC _I is set to 0 (ISC _I ← 0) Then, proceed to S1859. Also, ISC
_{When I} ≧ 0, the process proceeds to S1847.

As described above, during open loop control (FL
When the cooling water temperature TW of AGCL = 0 is low (TW ≤ TWCL)
) And the closed loop correction ISC _I is negative (ISC _I <0), the closed loop correction ISC _I is set to 0. (ISC _I
← 0). That is, when the closed-loop correction I component ISC _I set by the learning value ACONI or ACOFFI described later is on the negative side, the duty ratio ISCON decreases, and the opening degree of the ISC valve 13 decreases and the engine speed NE decreases. In order to prevent this, the lower limit value of the closed-loop correction ISC _I set by the learning value ACONI or ACOFFI immediately after the starter switch 61 shifts from ON to OFF (start-up control → normal control). It is set to 0.

Then, S1853 to S1856 or S185
When the process proceeds to S1859 from any one of the steps 8, the previous start / normal control discrimination flag (FLAGST) to be used in the next routine stored at a predetermined address in the RAM 50 with the current start / normal control discrimination flag FLAGST value ) Update the OLD value ((FLAGST) OLD ← FLAGST) and exit the routine.

(Closed Loop Correction I Minute Learning Subroutine) FIG. 26 shows the closed loop correction I correction subroutine executed in the closed loop correction I minute update procedure (see S1846).
This is a minute learning subroutine.

First, it is determined in S1901 to S1908 whether the learning condition is satisfied.

That is, in S1901, the cooling water temperature TW is compared with the warm-up completion judgment value LRNITW [° C.], and TW ≧ L
If RNITW (engine warm-up completed), proceed to S1902, if TW <LRNITW (engine cold), S1
Proceed to 913.

In S1902, the value of the power steering correction value ISCPS is referred to. If ISCPS = 0 (the power steering turning angle is small), the flow proceeds to S1903, and if ISCPS ≠ 0, the flow proceeds to S1913.

In S1903, it is determined whether the air conditioner switch 89 is OFF. If it is OFF, the flow proceeds to S1904, and if it is ON, the flow proceeds to S1905.

In S1904, the radian correction value ISC is set.
Referring to the value of RA, ISCRA = 0 (radiator fan 62
Is OFF), proceed to S1905, and if ISCRA ≠ 0, S1
Proceed to 913.

Then, S1903 or S1904 to S1905
When the process proceeds to, the value of the acceleration / deceleration correction DSHPT is referred to, and DSHPT = 0.
In the case of, the process proceeds to S1906, and in the case of DSHPT ≠ 0, the process proceeds to S1913.

At S1906, the dashpot correction value DH
Referring to the value of ENB, if DHENB = 0, that is, if DSHPT = 0 and DHENB = 0 and it is determined that the engine is in the idling steady state, the flow proceeds to S1907, and DHEN
If B ≠ 0, proceed to S1913.

In S1907, the closed loop correction I
With reference to the ISC _I correction amount ΔI, the process proceeds to S1908 if ΔI = 0 (a state in which the engine speed NE converges within the allowable range of the idle target speed NSET), and proceeds to S1913 if ΔI ≠ 0. move on.

In S1908, the set value LRISCT corresponding to the predetermined time and the learning condition satisfaction determination count value C are determined in order to determine whether the state in which learning is possible has continued for a predetermined time or more.
Compare COUNTISCI with COUNTISCI ≧ LRISC
In the case of T, it is determined that the learning condition is satisfied, and the flow advances to S1909. If COUNTISCI <LRISCT, the process proceeds to S1910, where the count value COUNTISCI is counted up (CO
UNTISCI ← COUNTISCI + 1), exits the routine.

On the other hand, if the flow proceeds to S1909, it is determined whether or not the air conditioner switch 89 is ON. If the air conditioner switch 89 is ON, the flow proceeds to S1911 and the I-part learning value ACONI stored at a predetermined address of the backup RAM 50a when the air conditioner is ON is closed loop at the present time. updated with the value of the correction I portion ISC _I (AC
ONI ← ISCI), and the process proceeds to S1913. S191 when OFF
2 and the I-minute learning value ACOF when the air conditioner is OFF stored at a predetermined address of the backup RAM 50a.
FI is the current closed-loop correction ISC ISC
Update with the value of _I (ACOFFI ← ISC _I ) and proceed to S1913.

Then, S1901, S1902, S1904 to S1907, S1
When the process proceeds to S1913 from 911 or S1912, the count value COUNTISCI is cleared (COUNT
ISCI ← 0), exit the routine.

[0337] Incidentally, as shown by the broken line in FIG. 42 (a), when not using I component learning value ACONI or ACOFFI when setting the closed loop correction I portion ISC _I, via the open-loop control from the start control Therefore, a difference occurs before the control is shifted to the closed loop control.
As a result, as indicated by the broken line in FIG. 42 (b), the initial explosion occurs, but does not easily transition to the complete explosion, and the transition from the start control to the open loop control has a slight rise in the engine speed NE. Occurs.

On the other hand, as shown by the solid line in FIG. 42 (a), the difference from the start control to the transition to the closed loop control is obtained by adding the I component learning value ACONI or ACOFFI to the closed loop correction I. Immediately, as shown by the solid line in FIG. 42 (b), the operation immediately shifts from the first explosion to the complete explosion, so that the engine speed NE rises smoothly and the startability is improved.

[0339]

As described above, according to the first aspect of the present invention,
According to Ming, the variable capacity energy associated with turning on the air conditioner switch
Increase in engine load by driving the ACON compressor
The setting value while the air conditioner switch is on.
The transient correction value is added to the fixed
Set the compensation value and set it at least based on the engine temperature.
The basic characteristic value set in
Correct and set the ISC valve opening to increase the amount of intake air.
When compensating by weighing, the air conditioner switch
Between the time it is turned on and the time that elapses
And the engine speed is preset to the idle target speed.
Only when the set value is less than or equal to the set upper limit value
Since the transient correction value is fixed by the first set value,
Variable volume that gradually increases after the switch is turned on
This corresponds to the driving load of the air conditioner compressor.
In the meantime, the transient correction value is fixed at the first set value, and I
SC valve opening can be kept increased and properly
The operation of the variable capacity compressor is reduced by increasing the intake air volume.
The load can be compensated. Therefore, the air conditioner switch
Immediately after turning on the air conditioner.
Appropriately increase the ISC valve opening in response to the dynamic load
In addition, the amount of intake air can be increased,
Eliminates the drop in engine speed,
Can be obtained.

[0340] After the air conditioner switch is turned on,
After the set time has elapsed or the engine speed is set to the upper limit
When the value is exceeded, the transient correction value is increased to the first
A second setting that is smaller than the set value,
Variable capacity after the air conditioner switch is turned on
Elapse of delay period of increase in driving load of air conditioner compressor
After that, the driving load of the variable capacity compressor becomes a steady state.
Therefore, correspondingly, the transient correction value is reduced accurately,
Increasing correction of intake air volume by transient correction value is gradually reduced
can do.

Therefore, is the air conditioner switch turned on?
From the variable displacement compressor
It is consistent with the process of engine load change due to drive load change.
As a result, it is possible to accurately increase the intake air amount,
Prevent fluctuations in engine speed and engine speed
Convergence can be improved.
Good feeling can be obtained.

According to the invention of claim 2, the air conditioner
Idle eyes when the switch is turned on from off
Set according to the deviation between the target speed and the engine speed
The feedback control value and then the air conditioner switch off
Target idle speed when the set time has elapsed
Set according to the deviation between the engine speed and the engine speed
Based on the difference from the back control value, the air conditioner correction learning value is
Set. And while the air conditioner switch is on
When the shift position of the automatic transmission is in the N or P range,
Is to fix the steady-state correction value by the air-conditioner correction learning value.
Thus, in addition to the effects of the invention described in claim 1, the ISC valve
To reflect the effects of age deterioration of the
N, P-lens greatly affected by aging of ISC valve
Automatic transmission torque transmission at the engine
When the air conditioner has been reduced, the air conditioner learning value
During the ON period of the ACON switch,
Increasing the amount of intake air by compensating for the effects of aging, etc.
Can stabilize the engine speed.
You. Also, when the air conditioner switch is on,
When the shift position of the transmission is in the travel range,
Steady-state correction value based on a third set value determined in advance corresponding to the
Is fixed, so that the torque of the automatic
If the engine load is increasing due to
The air conditioner switch is turned on by the third set value corresponding to
Increase the opening of the ISC valve properly during the period and inhale
The air volume can be increased, and in this case
The engine speed can be stabilized.

According to the third aspect of the present invention, the air conditioner
After the switch goes from on to off, the air conditioning
If it is equal to or greater than the preset value, the air-conditioner correction value
Is reduced by the first subtraction value every calculation cycle. And d
When the AC compensation value falls below the set value,
The positive value is increased by a first
Decreased every operation cycle by the second subtraction value smaller than the subtraction value
The invention according to claim 1 or 2 because the number is reduced.
In addition to the effect, the air conditioner switch was turned off from on
After that, the variable capacity air conditioner compressor
The transient correction value is gradually and accurately reduced according to the drive load.
To gradually reduce the opening of the ISC valve.
The operation of the variable displacement compressor is reduced by the gradual decrease of the intake air volume.
The load can be compensated. Therefore, the air conditioner switch
Immediately after turning off the air conditioner.
Reduce the opening of the ISC valve appropriately in response to the gradual decrease in dynamic load
Slightly, the intake air volume can be gradually reduced,
As a result, the regular supplement is set immediately after the air conditioner switch is turned off.
Sudden decrease in intake air volume due to positive value being set to zero
Eliminates the drop in engine speed caused by
The variable capacity air conditioner remaining immediately after the switch is turned off
Without being affected by friction from the impreza
The convergence of the engine speed can be improved,
Feeling can be obtained. Also air conditioning
After the switch goes from on to off, the air conditioning
If the value is equal to or greater than the preset value,
Gradually decreased by the first subtraction value and decreased below the set value
When the second subtraction value is smaller than the first subtraction value,
Air conditioner correction value is set to zero corresponding to no correction every calculation cycle
Convergence of the engine speed
Both improvement and stabilization can be achieved.

According to the fourth aspect of the present invention, the variable capacitance energy
An air conditioning compressor is installed and the air conditioner switch is turned on.
After switching from off to on, the air
Turn off relay and move from engine to above compressor
When the power transmission of the
The basic characteristic value set based on the
Installed in the air bypass passage that bypasses the
The ISC valve opening to increase the amount of intake air
The variable capacity air conditioner compressor
The base value to compensate for the increase in engine load.
It is given by an accord clutch correction value. And this air
When the air conditioner switch is turned on
From the moment, the air conditioner switch is turned off and then
Until the set time that is longer than the delay time elapses
During the operation of the variable capacity air conditioner compressor
Preset values to compensate for increased engine load
Air conditioner switch from on to off
Load of variable capacity air conditioner compressor immediately after
When the delay time of turning off the air conditioner relay due to the gradually decreasing
The air conditioner clutch correction value during this time.
The opening of the ISC valve is corrected to increase and the amount of intake air
Because of the delay period of turning off the air conditioner relay
The load on the variable capacity air conditioner compressor
Despite the sudden decrease in the correction value, the intake air amount
The engine speed temporarily drops due to the decrease
Can be eliminated. Therefore, variable volume air
Appropriately compensates for engine load caused by driving the compressor
Can be compensated and improve driving feeling
it can.

[Brief description of the drawings]

1 and 2 are flowcharts showing an ISC valve control procedure.

FIG. 2

FIG. 3 is a flowchart illustrating a correction value setting procedure.

FIG. 4 is a flowchart showing a basic characteristic value setting procedure.

FIG. 5 is a flowchart showing a procedure for setting an idle target rotation speed;

FIG. 6 is a flowchart showing a closed / open loop control determination procedure.

FIGS. 7 and 8 are flowcharts showing an air conditioner correction value setting procedure.

FIG. 8

FIG. 9 is a flowchart showing an air conditioner correction learning procedure when the air conditioner switch is turned from OFF to ON.

FIG. 10 is a flowchart showing an air conditioner correction learning procedure when the air conditioner switch is turned on → off.

FIGS. 11 and 12 are flowcharts showing a procedure for setting an AT vehicle traveling range correction value.

FIG. 12

13 and 14 are flowcharts showing an acceleration / deceleration correction setting procedure.

FIG. 14

FIG. 15 is a flowchart showing a dashpot correction value setting procedure.

FIG. 16 is a flowchart showing a procedure for updating a dashpot correction value.

FIG. 17 is a flowchart showing a procedure for setting a radial fan correction.

FIG. 18 and FIG. 19 are flowcharts showing a power steering correction value setting procedure.

FIG. 19

FIG. 20 is a flowchart showing a procedure for setting an air conditioner clutch correction value.

FIG. 21 is a flowchart showing a procedure for setting a correction initial value after starting.

FIG. 22 is a flowchart showing a post-start correction setting procedure.

FIGS. 23 to 25 are flowcharts showing a closed-loop correction I component updating procedure.

FIG. 24

FIG. 25

FIG. 26 is a flowchart showing a closed-loop correction I-minute learning procedure;

FIG. 27 is a schematic diagram of an engine control system.

FIG. 28 is a configuration diagram of a control device.

FIG. 29 is a time chart showing a relationship among an air conditioner switch, an air conditioner correction value, and an engine speed.

FIG. 30 is a time chart showing a relationship between a traveling range or N and P ranges, an AT vehicle traveling range correction, and an engine speed.

FIG. 31 is a time chart showing a relationship among an idle switch, throttle opening, acceleration / deceleration correction, and engine speed.

FIG. 32 is a time chart showing a relationship among an idle switch, an engine speed, and a dashpot correction value.

FIG. 33 is a time chart showing the relationship between radiator fan ON / OFF and radiator correction.

FIG. 34 is a time chart showing hysteresis at the time of setting the idling rotation speed.

FIG. 35 is a time chart showing a relationship between a power steering switch, a power steering correction value, and an engine speed.

FIG. 36 is a time chart showing a relationship among the capacity of an air conditioner switch, an air conditioner clutch relay, an air conditioner compressor, an air conditioner clutch correction value, and an engine speed.

FIG. 37 is a time chart showing changes in post-start correction.

FIG. 38 is a time chart showing a change in duty ratio.

FIG. 39 is a time chart showing a shift of a post-start correction value to a closed loop correction I portion.

FIG. 40 is an explanatory diagram showing the relationship between the correction amount for the closed loop correction I and the difference rotation.

FIG. 41 is a time chart showing the relationship between the engine speed, the amount of correction for closed loop correction I, and the amount of closed loop correction I;

FIG. 42 is a time chart showing a use state of a learning value for closed loop correction I;

[Explanation of symbols]

 6e: Air bypass passage 11d, 11e: Throttle valve 13: ISC valve 89: Air conditioner switch AON: Set time (after turning on the air conditioner switch) NSET + DNAC: Set upper limit value ISCACF: Air conditioner transient correction value ISCACS: Air conditioner steady correction value ISCAC: Air-conditioner correction value ACFFD, ACFFN: first set value DACFF: second set value ACDTY: third set value ISCTW: basic characteristic value LISCI, MISCI: feedback control value TACLRN, TCLH: set time MACDTY: air-conditioner correction learning value ISCACD, DISCLH: Set value DSAC1D, DSAC1N: First subtraction value DSAC2D, DSAC2N: Second subtraction value ISCCLH: Air conditioner clutch correction value NE: Engine speed TW: Engine temperature (cooling water temperature)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02D 29/00-29/06 F02D 41/00-45/00 395

Claims (4)

(57) [Claims] 1. A variable capacity air conditioner compressor is mounted.
The air conditioner switch is turned on.
To fix the steady-state correction value according to the set value.
Is turned on, the transient correction value is set by the first set value.
And then to a second set value that is smaller than the first set value
More gradually, at least based on engine temperature.
The basic characteristic value set in
Corrected by the air conditioner correction value that added the handover correction value,
Via the air bypass passage that bypasses the throttle valve
Set the opening of the mounted ISC valve to increase the amount of intake air.
In the method of controlling an ISC valve for an engine, the transient correction value is set after the air conditioner switch is turned on.
Until the set time has elapsed and the engine
The number of revolutions adds a preset value to the idle target speed.
Only when it is less than the calculated upper limit, the first
More fixed, after a set time from being turned on the air conditioner switch,
Or, if the engine speed exceeds the upper limit
Until the transient correction value becomes zero,
I of an engine characterized by a more gradual decrease
SC valve control method. 2. The air conditioner switch is turned on from off.
At the time, the target speed of the idle
The feedback control value set according to the deviation
After the set time elapses after the air conditioner switch is turned on,
And the deviation between the target idle speed and the engine speed.
Based on the difference from the previously set feedback control value.
Te, set the air conditioner correction learning value, while the air conditioner switch is turned on, the steady-state correction value, automatic
When the shift position of the transmission is in the travel range,
Fixed according to a third set value predetermined in accordance with the
When the shift position of the dynamic transmission is in the N or P range,
A contract that is fixed by an air conditioner correction learning value.
The method for controlling an ISC valve of an engine according to claim 1 . 3. The air conditioner switch shifts from on to off.
After that, if the air conditioner correction value is
At this time, the air-conditioner correction value is calculated based on a first subtraction value for each calculation cycle.
And the air conditioner correction value falls below the above set value.
Come, the first subtraction until the air conditioner compensation values reaches zero
Decrease every operation cycle by the second subtraction value smaller than the value
3. The ISC valve control method for an engine according to claim 1, wherein 4. A variable capacity air conditioner compressor is mounted.
After the air conditioner switch changes from on to off,
Turn off the air conditioner relay with a fixed delay
To shut off power transmission from the compressor to the compressor.
There, the basic characteristics set based on at least the engine temperature
Adjust the air valve to bypass the throttle valve.
Set the opening of the ISC valve interposed in the Ipass passage,
By increasing the intake air volume, the variable capacity air
Compensates for increase in engine load due to compressor operation
The base value given by air conditioning clutch correction value from the time the air conditioner switch is turned on to, air conditioning Sui
Switch is turned off, and then set for longer than the delay time.
Until the set time elapses, the air conditioner
Compensate for the increase in engine load associated with driving the compressor
For the above air conditioner clutch,
Set the correction value and set the basic characteristic value according to the air conditioner clutch correction value.
Correct the air bypass to bypass the throttle valve
Set the opening of the ISC valve interposed in the
An ISC valve control method for an engine, characterized by increasing the amount of air .