JP2928652B2 - Control device for vehicle engine with automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an engine for a vehicle with an automatic transmission, and more particularly to a control device for an engine for a vehicle with an automatic transmission that controls the engine output during gear shifting to perform torque reduction control. .

[0002]

2. Description of the Related Art In a conventional control system for an engine for a vehicle with an automatic transmission, torque reduction control of the engine is performed in order to suppress a thrust shock during gear shifting. Is obtained from the turn bin rotation speed and the throttle opening at the point where the turn bin rotation speed suddenly changes, for example, at the point where the turn bin rotation speed decreases in the case of a shift up (for example, Japanese Patent Application Laid-Open No. 60-227049). Reference).

[0003]

However, in the above-described control apparatus for a vehicle engine with an automatic transmission,
If the torque drops due to the one-way clutch engagement timing, a so-called shift shock occurs, and if the clutch engagement force is reduced due to wear of the clutch or the oil pressure is weak, or if the torque is higher than the setting, the turbine An idling of rotation speed appears.

[0004] Therefore, in a device adopting the torque down control, the torque is increased due to the over-control at the time of idling and the shift time becomes shorter than a set value, so that the force applied to the clutch is increased and the deterioration of the clutch is further increased. There is a problem of going forward.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has the following arrangement as means for solving the above-mentioned problems. That is, an automatic transmission, change point detecting means for detecting a change point at which the turbine rotation changes from a rising direction to a decreasing direction, and torque reduction corresponding to the turbine rotation at the change point detected by the change point detecting means. A control means for initiating a torque-down control based on the amount of change, the control means for a vehicle engine with an automatic transmission, wherein the change detected by the change point detecting means after a shift signal is input. An air-blowing detecting means for detecting air-blowing of the turbine rotation during a period up to a point, and when the air-blowing detecting means detects the air-blowing, the control means outputs a torque based on the turbine rotation at the change point. Regulating means for regulating the setting of the down amount.

Preferably, the air-blowing detecting means detects air-blowing based on a sudden change in turbine rotation in a rising direction.

[0007]

In the above configuration, proper torque correction is performed at the time of gear shifting, and functions to suppress a decrease in torque at the time of gear shifting.

[0008]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a diagram illustrating an overall configuration of a control device (hereinafter, referred to as a device) for a vehicle engine with an automatic transmission according to an embodiment of the present invention. In the figure,
A piston 2 slides in a combustion chamber 3 of the engine body 1, and an intake port 4 and an exhaust port 6 are supported in the combustion chamber 3. An intake valve 7 is provided between the intake port 4 and the combustion chamber 3, and an exhaust valve 8 is provided between the exhaust port 6 and the combustion chamber 3.

A throttle valve 9 for controlling the amount of intake air is provided upstream of the intake port 4, and a surge tank 10 as an intake expansion chamber is provided downstream of the throttle valve 9. Further downstream, there is an injector 11 for injecting and supplying fuel.
Is provided. The amount of intake air to the intake port 4 is detected by an air flow sensor 20 a in the air flow meter 20, and the temperature of the intake air is detected by an intake temperature sensor 21. The throttle opening sensor 22 incorporates an idle switch (not shown) and detects the opening of the throttle valve 9. The distributor 15 is provided with a rotation speed sensor 25 for detecting the engine rotation speed, a crank angle sensor 28 for detecting the crank angle, and the exhaust port 6 is provided with an O ₂ sensor 26. I have.

The torque converter 5 in the automatic transmission 13 is provided with a turbine speed sensor 12 for detecting a turbine speed. The speed signal Ne from the sensor and a shift from the automatic transmission 13 are detected. The pattern signal is input to an engine control unit (ECU) 30. The engine control unit (ECU) 30 receives the output from each of the above-mentioned sensors, sends an ignition time control signal to the distributor 15, and sends a control signal to the injector 11 to adjust the fuel injection amount. .

Next, the torque down control in the apparatus of this embodiment will be described in detail. FIG. 2 is a flowchart showing a torque control procedure in the apparatus of the present embodiment. In the figure, an engine control unit (ECU) 3
In step S1, the shift pattern is read from the vehicle speed V based on the output from the rotation speed sensor 25, the throttle opening TVO detected by the throttle opening sensor 22, and the shift pattern signal from the automatic transmission 13. Put in. In step S2, it is determined from the shift pattern read in step S1 whether or not the vehicle is in a shift state.

If the determination in step S2 is YES,
At step S3, a shift signal is output, and upon receiving this signal, the transmission 13 starts a shift operation at the next step S4. In step S5, as will be described later, an air blowing detection process according to the flowchart shown in FIG. 3 is executed based on the fluctuation of the turbine speed. Then, the next step S6
If it is determined from the result of the processing in step S5 that an idle air blow has occurred, then in step S12, if it is determined that no idle air blow has occurred, it is determined whether or not the actual gear shift has been started in step S7. Is determined.

In step S8, since it is determined in step S6 that there is no idling, the turbine speed at the start of the actual shift is read. In the following step S9, a torque down control amount determined by the turbine rotational speed read in step S8 and the throttle opening at that time is determined.
Then, in step S10, torque control is executed based on the torque down control amount determined in step S9.

In step S11, it is determined whether the torque control has been executed or not. If the determination result is NO, the process returns to step S10, but if the determination result is YES, the process returns to step S1. On the other hand, if it is determined in step S6 that idling is occurring, and if it is determined in step S12 that actual shifting has started, the engine control unit (ECU) 30 reads the turbine speed at that time in step S13. Put in. The turbine speed is a speed corresponding to a point B in FIG. 4 described later. In the next step S14, a torque down control amount T1 determined by the turbine speed read in step S13 and the throttle opening at that time is determined.

In step S15, a virtual turbine speed, which will be described later, that is, the turbine speed when it is assumed that no air blowing has occurred, is read. In the following step S16,
A torque down control amount T2 determined by the turbine speed calculated in step S15 and the throttle opening at that time is determined. This virtual turbine rotation speed is a rotation speed corresponding to point A in FIG.

At step S17, at step S1
4. Based on the torque down control amounts T1 and T2 determined in step S16, the torque down control amount T is calculated according to the following equation (1). That is, the torque down control amount is obtained by T = (T1 + T2) / 2 (1).

Here, the reason why the final calculation of the torque down control amount T is performed using the above equation (1) will be described. FIG. 4 is a diagram showing a change in turbine speed nt with respect to time t, and a solid line in the diagram indicates an actual change in turbine speed. Regarding the turbine rotation speed corresponding to point A in the figure, even if the torque correction amount is determined on the basis of the value, the correction amount is small, while the turbine rotation speed corresponding to point B is idle. Is not obtained as a result of transmission of the actual engine output.
Therefore, when the torque reduction amount is determined based on the turbine rotation speed corresponding to the point B, the torque reduction amount is set to be large by the amount of the idling.

Therefore, in order to mutually correct the torque down amounts obtained based on the turbine speeds corresponding to the points A and B, the average of the two torque down control amounts is calculated according to the equation (1). It is determined as the final torque down control amount T. After obtaining the final torque-down control amount T in step S17, torque control is executed based on the torque-down control amount in step S10. Then, in step S11, it is determined whether or not the torque control has been executed or ended. If the result of the determination is NO, step S11 is repeated.
Return to 10. However, if the result of the determination is YES, the process returns to step S1.

Next, a description will be given of the processing for detecting an air blow at step S5 in the flowchart shown in FIG. FIG. 3 is a flowchart showing a process for detecting air blowing from fluctuations in the turbine speed. Referring to FIG.
As initialization, the values of variables i and j, which will be described later, are set to 0, and the air blowing flag F is set to 0. Next step S22
In the engine control Yunitsuto (ECU) 30 reads the actual turbine speed nt _i at time t _i as illustrated in FIG. 4, in the following step S23, and stores that value in Sutatsuku (not shown) in the ECU30 .

In step S24, the value of i is decremented by one, and in the next step S25, it is determined whether or not the absolute value of i is greater than a basic sampling number K1 for smoothing to be described later. If the determination result is NO, step S
22 and the actual turbine speed nt at time t _i-1
Read _i-1 . However, the determination in step S25 is YE
If it is S, it is determined that the desired number of smoothing start basic samples has been obtained, and the number of smoothed samples K2 is determined in step S26.
Here, a value of 5 to 8 is used as the number of smoothed samples K2.

In the next step S27, the following equation (2)
, The turbine speed is smoothed.

[0022]

(Equation 2)

In step S28, an air blowing threshold value K4 corresponding to the throttle opening at that time is retrieved from the table shown in FIG. 5, and in the next step S29, the following equation (3) is obtained.
Variation turbine speed of the smoothed determined by [Delta] Nt _i
And the variation ΔNt _i-K3 of the turbine speed at a point before K3 (a variable for variation comparison, which takes a value of 3 to 5).
Then, it is determined whether the value is larger than the air blowing threshold value K4 retrieved in step S28 or whether the value is negative.

ΔNt _i = Nt _i −Nt _{i -1} (3) If the value of ΔNt _i −ΔNt _i -K3 is smaller than K4 in the judgment in step S29, the process returns to step S22 again, and if it is equal to or larger than K4. If so, it is determined that the fluctuation ΔNt of the turbine speed has begun to change suddenly, and the flow advances to step S30 to set the value of j to 1
Only increment.

Further, if it is negative the value of ΔNt _i -ΔNt _i-K3, the process proceeds to the normal control of the step S36 as the shift is started. In step S31, it is determined whether or not the value of j is equal to or greater than the comparison threshold value K5. If j is smaller than the threshold value, the process returns to step S22.
It is determined that the fluctuation of the turbine speed has continued for a predetermined time or more and the air blowing has started, and the air blowing flag is turned on in step S32. It should be noted that this air blowing start point corresponds to point C in FIG.

In step S33, the actual turbine speed nt
At time t, as shown in FIG. _i Turbines in
Rotation speed nt_i And the time t which is three sampling points before that_i-3 To
Turbine speed nt_i-3 Calculate the difference between
Is negative, that is, the point where the actual turbine rotation starts to decrease
(Point B in FIG. 4). At step S35,
ΔNt determined in step S29_i −ΔNt_i-K3Based on the value of
Before the start of air blowing, that is, the time before point C in FIG.
The change in turbine speed at
Equation (4) is introduced.

[0027] nt = In _{{(ΔNt i -ΔNt i-K3} ) / (t i -t i-K3)} t + C ... (4) where, C is followed by a constant step S37, step S33
The point at which the actual turbine rotation obtained in the step starts to decrease, that is, FIG.
The turbine speed corresponding to the point A at the time t _{S at} the point B is obtained by the above equation (4). This is the turbine speed when it is assumed that there is no blowing, that is, the virtual turbine speed. Point A is a straight line obtained by approximating the change in turbine speed at a time before point C by the above-described linear expression (4). And the perpendicular BD drawn from the point B to the horizontal axis.

As described above, according to this embodiment,
By detecting the air blow of the turbine speed at the time of shifting by the automatic transmission, the torque down control amount is determined based on the turbine speed at the start of the actual speed change and the turbine speed at the time when it is assumed that there is no air blow. Thus, there is an effect that appropriate torque correction can be performed and an excessive decrease in torque during shifting can be prevented.

[0029]

As described above, according to the present invention,
There is an effect that it is possible to prevent the turbine rotation speed from increasing due to the idling of the turbine rotation speed at the time of gear shifting by the automatic transmission, thereby causing an excessive decrease in torque.

[Brief description of the drawings]

FIG. 1 is a diagram showing the overall configuration of a control device for a vehicle engine with an automatic transmission according to an embodiment of the present invention;

FIG. 2 is a flowchart showing a torque control procedure in the apparatus of the embodiment;

FIG. 3 is a flowchart showing a process of detecting air blowing from fluctuations in turbine speed;

FIG. 4 is a diagram showing a change in turbine speed with respect to time;

FIG. 5 is a diagram showing a table for searching for an air blowing threshold value corresponding to a throttle opening;

FIG. 6 is a diagram for explaining how to obtain a sample value of the turbine speed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine main body 2 Piston 3 Combustion chamber 4 Intake port 5 Torque converter 6 Exhaust port 7 Intake valve 8 Exhaust valve 9 Slottle valve 10 Surge tank 11 Injector 12 Turbine speed sensor 13 Automatic transmission 15 Distributor 20 Air flow meter 20a Air flow sensor 21 intake air temperature sensor 22 Surotsutoru opening sensor 25 speed sensor 26 O ₂ sensor 28 crank angle sensor

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F02D 29/00 B60K 41/04 F02D 45/00 310 F02D 45/00 330

Claims (2)

(57) [Claims] 1. An automatic transmission, a change point detecting means for detecting a change point at which the turbine rotation changes from an ascending direction to a decreasing direction, and a change in the turbine rotation at the change point detected by the change point detecting means And a control means for starting torque-down control based on the torque-down amount. The control device for a vehicle engine with an automatic transmission, wherein the change-point detection means detects a shift signal after a shift signal is input. An air-blowing detecting means for detecting air-blowing of the turbine rotation during the period up to the changed point, and when the air-blowing detecting means detects air-blowing, A control device for a vehicle engine with an automatic transmission, comprising: a regulating unit that regulates the setting of the torque reduction amount based on the torque. 2. The control device for a vehicle engine with an automatic transmission according to claim 1, wherein the air-blowing detecting means detects the air-blowing based on a sudden change of the turbine rotation in a rising direction. .