JPH0615306B2 - Start control method for internal combustion engine vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine vehicle equipped with a vehicle clutch device configured so that clutch engagement and disengagement operations can be performed in response to an electric signal. The present invention relates to a start control method.

(Prior Art) As a conventional control method for starting a vehicle equipped with a vehicle clutch device that operates in response to an electric signal, for example, the internal combustion engine speed is set to the accelerator while the friction clutch is engaged. A vehicle start control method is known in which the vehicle start can be smoothly performed by controlling the position of the fuel adjusting member so as to maintain the value according to the operation amount (JP-A-60- 12345).

(Problems to be Solved by the Invention) However, according to the control method described above, the deceleration operation for returning the accelerator pedal at a relatively high speed while the clutch engagement operation is being performed by the automatic clutch device to start the vehicle. When the engine is operated, the fuel adjusting member is quickly returned to the position where the fuel is cut so that the engine speed corresponds to the accelerator operation amount at that time, so that the twisting force acts on the vehicle drive system and the clutch is disengaged. There has been a problem that a mechanical shock and / or an unpleasant sound is generated when separated. In addition, such a twisting force causes a problem that the life of the vehicle is shortened.

Therefore, an object of the present invention is to provide a start control method for an internal combustion engine vehicle using a vehicle clutch device, which is capable of solving the above-mentioned problems caused by the conventional vehicle start control method.

(Means for Solving the Problems) The method according to the present invention relates to an internal combustion engine vehicle equipped with a clutch device configured to connect and disconnect a clutch in response to an electric signal for starting the vehicle. At least during the connection operation period of the clutch device, in the start control method of the internal combustion engine vehicle, which controls the speed of the internal combustion engine in relation to the operation amount of the accelerator operation member, the accelerator operation member during the starting operation of the vehicle. It is characterized in that the rotational speed of the internal combustion engine is reduced at a rate such that a large strain force does not occur in the drive system of the vehicle including the clutch when operated in the deceleration direction.

(Operation) When acceleration is performed by the accelerator operating member during the start control, the internal combustion engine speed increases in accordance with the operation amount of the accelerator operating member, whereby smooth start control that matches the accelerator operating state is executed. It On the other hand, during start control, when the accelerator operating member is operated in the deceleration direction at an operating speed higher than a predetermined operating speed, the speed of the internal combustion engine does not change in accordance with the change in the accelerator operation amount at that time, and the vehicle The engine speed is reduced at a rate such that a large twisting force is not generated in the drive system.

As a result, even if the accelerator operating member is rapidly operated in the decelerating direction for some reason during the vehicle start control, the engine speed does not decrease rapidly in response to it.
It is possible to effectively prevent an excessive strain force from being generated in the vehicle drive system as it slowly drops.

Example Hereinafter, the method of the present invention will be described in detail with reference to the illustrated example.

FIG. 1 shows a block diagram of an internal combustion engine vehicle device configured to perform vehicle start control by a start control method according to the present invention. The internal combustion engine vehicle device 1 is
An internal combustion engine 3 for driving a wheel drive unit 2 of a vehicle (not shown) is provided, and a rotational output from an output shaft 4 of the internal combustion engine 3 includes an automatic clutch device 6 including a friction clutch 5. It is configured to be transmitted to the wheel drive unit 2 via the gear type transmission 7.

The automatic clutch device 6 includes a drive plate 5a and a passive plate 5b, and a known friction clutch 5 configured to connect and disconnect by adjusting the position of the passive plate 5b by operating a release lever 5c. Of the clutch actuator 8 for operating the release lever 5c and the actual position of the passive plate 5b (hereinafter,
The clutch position sensor 9 for detecting the actual clutch position). The first position signal Pc indicating the actual clutch position output from the clutch position sensor 9 is the target position of the passive plate 5b (hereinafter referred to as the target clutch position).
Is input to the clutch control unit 10, which is input from the outside as described later. The clutch control unit 10 is responsive to the first position signal Pc and the first target signal Sc to drive the clutch actuator 8 so that the actual clutch position is positioned at the target clutch position indicated by the first target signal Sc at that time. The first drive signal Dc is output, and the friction clutch 5 is controlled to be in the target clutch position state indicated by the first target signal Sc given from the outside.

In order to be able to automatically shift the gear shift position of the gear type transmission 7 to an optimum position corresponding to the current operating state of the vehicle, a transmission actuator for operating the gear type transmission 7 11, a gear position sensor 12 that detects the actual gear shift position of the gear-type transmission 7 at each time and outputs a second position signal Pg that indicates the actual gear shift position, and a transmission actuator 11 that receives a second position signal Pg in response to the second position signal Pg. A transmission control unit 13 that outputs a drive signal Dg is provided, and an automatic transmission system is configured together with the automatic clutch device 6.

In the transmission control unit 13, a vehicle speed signal V indicating the actual vehicle speed at that time and an accelerator signal A indicating the operation amount of the accelerator pedal 14 are sent to the vehicle speed sensor 20 and the accelerator sensor 1.
6, the optimum gear shift position at that time is map-calculated based on appropriate map data from the vehicle speed at that time indicated by the vehicle speed signal V and the accelerator operation amount at that time indicated by the accelerator signal A. The second drive signal Dg for driving the transmission actuator 11 so that the target gear position indicated by the calculation result is obtained is output while referring to the second position signal Pg. The transmission control unit 13 further includes a gear shift execution signal GS indicating that the gear shift operation is being performed, a clutch control signal CS for disengaging the friction clutch 5 during the gear shift operation, and a friction clutch for gear shifting. The engine control signals EC for controlling the rotational speed of the internal combustion engine 3 are output so that the internal combustion engine 3 does not blow up when 5 is disconnected. Since the transmission control unit itself having such a function is known, a detailed description of its configuration will be omitted.

The clutch control signal CS is input to the first changeover switch 17 and taken out as the first target signal Sc when the first changeover switch 17 is changed over as shown by the solid line. On the other hand, the shift execution signal GS is a signal for controlling the switching of the second changeover switch 18
Is given to. The gear change execution signal GS indicates the gear type transmission 7.
When it is in the state indicating that the gear shifting operation is being performed, the second changeover switch 18 is changed over to the state shown by the dotted line in FIG. 1, and the engine control signal EC is selected as its output. ing. On the other hand, the shift execution signal G
When S indicates that the gear type transmission 7 is not performing a gear shifting operation, the second changeover switch 18
Has been switched to the state shown by the solid line in FIG. 1, and the accelerator signal A is selected instead of the engine control signal EC.

A block indicated by reference numeral 19 is a start detection unit that determines whether or not the vehicle is in a start state, and receives a speed signal N, an accelerator signal A, a second position signal Pg, and a vehicle speed signal V. Based on these input signals, the start detection unit 19 determines whether the vehicle is in the starting operation state, and the start detection signal SS is output only when it is determined that the vehicle is in the starting operation state.

The start detection signal SS is the start control unit 2 to which the speed signal N, the accelerator signal A, and the first position signal Pc are input.
0 is input as a start signal, and when the vehicle starts,
The start control unit 20 outputs a first control signal Uc and a second control signal Ue for controlling the automatic clutch device 6 and the internal combustion engine 3 according to the method of the present invention. The first and second control signals Uc and Ue are input to the first changeover switch 17 and the third changeover switch 21, respectively. The first and third changeover switches 17 and 21 operate in response to the start detection signal SS, and when the start detection signal SS is output, these changeover switches 17 and 21 are shown by dotted lines in FIG. 1, respectively. Switch as shown. As a result, when the vehicle starts, the clutch control unit 1 uses the first control signal Ue as the first target signal Sc instead of the clutch control signal CS.
At the same time, the second control signal Ue is given to the engine control unit 22 as the target signal Nt in place of the output of the second changeover switch 18.

The speed signal N is input to the engine control unit 22 in addition to the target speed signal Nt, and the fuel supplied to the internal combustion engine 3 is adjusted so that the actual speed of the internal combustion engine 3 matches the target speed indicated by the target speed signal Nt. The position of the throttle valve, control lever, etc.
It is executed by the engine control unit 22.

Next, the configuration of the start control unit 20 will be described with reference to FIG.

The accelerator signal A is input to the target speed calculation unit 31, where the target speed TN of the internal combustion engine 3 corresponding to the accelerator operation amount at that time is calculated. This calculation is performed on the basis of map data indicating the relationship between the accelerator operation amount and the target speed that have been stored, and the target speed data Da indicating this calculation result is given to one fixed contact 32a of the changeover switch 32. . The output from the movable contact 32b of the changeover switch 32 is taken out as the second control signal Ue and given to the third changeover switch 21 (see FIG. 1). Second control signal U
e and the target speed data Da are compared in the target rotation comparison unit 33, and the comparison output signal CM indicating the comparison result is input to the switch 34.

The first position signal Pc indicating the clutch position at that time is the first
It is input to the determination unit 35, where the position of the passive plate 5b of the friction clutch 5 is within a range closer to the drive plate 5a than the predetermined position (hereinafter, this state is "the clutch position is a predetermined position or more"). It is determined whether or not), and the switch 34 is closed by the output of the first determination unit 35 when the clutch position is equal to or greater than a predetermined position.

The comparison output signal CM extracted by closing the switch 34 is input to the OR gate 37 to which the detection signal DS from the rapid deceleration detection unit 36 that operates in response to the accelerator signal A is input. The comparison output signal CM is Ue
It is a signal which becomes "H" level only in the case of the state of> Da, while the detection signal DS is a signal which becomes "H" level when the accelerator pedal 14 is operated in the deceleration direction at an operation speed equal to or higher than a predetermined value. is there.

The output of the OR gate 37 is applied to the changeover switch 32 as its changeover control signal, and the changeover switch 32 is changed over as shown by the dotted line when the output of the OR gate 37 is at the "H" level.

The other fixed contact 32c of the changeover switch 32 has an output T from the timer 38 which operates in response to the start detection signal SS.
The output data Db from the target speed subtraction unit 39, which is operable only for a predetermined period when the level of a is "H", is applied. The target speed subtraction unit 39 repeatedly executes an operation of subtracting a constant value from the value of the target speed indicated by the input second control signal Ue at predetermined time intervals, and the output data Db indicating the subtraction result is the other. Fixed contact 32c
Applied to.

Here, the level of the detection signal DS is "L" unless the accelerator pedal 14 is operated in the deceleration direction at a speed higher than a predetermined operation speed after it is determined that the vehicle is in the starting state.
Since the switch 34 is in the open state when the clutch position is equal to or larger than the predetermined value, the switch 34 is in the open state when the friction clutch 5 is about to be connected for the start operation. It will be. Therefore, in the above-mentioned state, the target speed data Da remains unchanged from the second control signal Ue.
Is output as.

If the accelerator operation is performed in the decelerating direction at an operation speed higher than a predetermined speed because the accelerator pedal 14 is suddenly released or the like, the level of the detection signal DS becomes "H" and the changeover switch 32 is indicated by a dotted line. Switched as shown. Therefore, in place of the target speed data Da that has rapidly decreased due to the release of the accelerator pedal 14 or the like,
The output data Db is output as the second control signal Ue.

The value of the second control signal Ue input to the target speed subtraction unit 39 is gradually decreased at a predetermined rate, and the target speed obtained as a result is output as output data Db, which is output via the switch 32 to the first value. 2 output as the control signal Ue. Therefore, when the changeover switch 32 is changed over by the dotted line, the state of Ue ≠ Da is set, and the level of the comparison output signal CM of the target rotation comparing section 33 becomes “H”. The comparison output signal CM that is at the “H” level is input to the OR gate 37 via the switch 34 that is closed by the output from the first determination unit 35. Therefore, even if the accelerator pedal 14 reaches the open position and the level of the detection signal DS returns to "L", the changeover switch 32 is indicated by a dotted line as long as the "H" level state of the comparison output signal CM continues. The switching state is maintained.

When the target value indicated by the output data Db from the target speed subtraction unit 39 becomes equal to or lower than the target value indicated by the target speed data Da, the level of the comparison output signal CM becomes “L”, and at this time, the level of the detection signal DS becomes If it is "L", the changeover switch 32 is returned to the changeover state shown by the solid line again.

That is, when the accelerator pedal 14 is operated in the deceleration direction at an operation speed equal to or higher than a predetermined operation speed, the second control signal Ue
Is used as the output data Db indicating the target speed which is reduced at a constant rate in the target speed subtraction unit 39,
When the state of Ue ≦ Da is reached, the accelerator pedal 1 is restarted.
The second control signal Ue is obtained in accordance with the operation of No. 4.

The start control unit 20 also includes a clutch feed amount setting unit 40 that operates in response to the accelerator signal A,
The setting data Dt indicating the target value of the clutch feed amount according to the accelerator operation amount at each moment, that is, the moving amount of the passive plate 5b per unit time is calculated and output. On the other hand, speed signal N
In order to determine whether the output torque of the engine is less than or equal to the value required for the engine load at that time,
The discriminating unit 41 is provided, and the discriminating data DD from the second discriminating unit 41 is input to the target clutch position calculating unit 42 to which the setting data Dt is input. The target clutch position calculation unit 42 responds to the output Tb from the timer 43 that operates in response to the start detection signal SS, and the level of the output Tb is "H" level in response to the start detection signal SS. It is a configuration that operates only during the period. The target clutch position calculation unit 42 calculates the target value of the clutch position suitable for the starting state at that time according to the operation amount of the accelerator pedal 14, and outputs the first control signal Uc indicating the calculation result.

As described above, the start control unit 20 uses the start detection signal S
In response to S, a first control signal Uc indicating a target value of the clutch position for starting and a second control signal Ue for controlling the engine speed during starting according to the method of the present invention are output.

With such a configuration, when the start detection unit 19 shown in FIG. 1 detects that the vehicle has started, the start control unit 20 outputs the first and second control signals Uc, Ue. , The changeover switch 1 which is changed over by the start detection signal SS as shown by the dotted lines, respectively.
The first target signal Sc and the target speed signal Nt are input to the clutch control unit 10 and the engine control unit 22 via 7, 21.

Therefore, in the automatic clutch device 6, the first control signal U
The control for connecting the friction clutch 5 is performed so that the clutch position determined by c is obtained. On the other hand, in the engine control unit 22, in response to the second control signal Ue, the engine speed control according to the accelerator pedal operation at the time of starting is executed, thereby performing the clutch connecting operation for starting the vehicle and the clutch connecting operation. Engine speed control for smooth execution is executed. In this case, when the accelerator pedal 14 is operated in the decelerating direction at an operation speed higher than the predetermined operation speed, the output data Db obtained by the subtraction operation by the target speed subtraction unit 39 is output, so that the engine speed rapidly increases. When the friction clutch 5 is subsequently disengaged, it is possible to effectively prevent an unreasonable strain force from being applied to the vehicle drive system.

When the start control is completed, the changeover switches 17 and 21 return to the state shown by the solid line again, so that the automatic clutch device 6 operates in response to the clutch control signal CS from the transmission control unit 13, while the engine control unit 22 is operated. Is an accelerator signal A or an engine control signal E from the changeover switch 18.
It operates in response to C, whereby control for automatic shifting is executed. Since this automatic shift operation is known, its details are omitted.

In the above embodiment, an example of the apparatus for carrying out the method of the present invention has been described.
In a vehicle control device using a microcomputer, it is needless to say that the microcomputer can be provided with an appropriate control program to carry out the method of the present invention.

In the above embodiment, when the accelerator pedal is rapidly operated in the deceleration direction when the vehicle is started, this is detected to prevent the twisting force due to the sudden deceleration from being applied to the vehicle drive system. The present invention is not limited to this, and is intended to detect all deceleration operations that cause an excessive force to be applied to the drive system while the vehicle is starting.

(Effects of the Invention) According to the method of the present invention, as described above, the vehicle with the clutch device is started in response to the signal from the outside, so that the clutch connection and the engine speed change depending on the operation amount of the accelerator. When the vehicle is controlled to start, the accelerator operation member is operated in a decelerating direction at an operation speed higher than a predetermined operation speed, for example, the target speed of the internal combustion engine responds to the accelerator operation amount. Since it does not change and changes stepwise or continuously at a predetermined rate, the speed of the internal combustion engine does not drop sharply in this case. Therefore, for example, even when the accelerator pedal is suddenly released, the engine speed gradually and gradually decreases, so that no excessive force is applied to the drive system of the vehicle, and noise or No problems such as vibration occur.

[Brief description of drawings]

FIG. 1 is a block diagram of an internal combustion engine vehicle apparatus for carrying out the method according to the present invention, and FIG. 2 is a detailed block diagram of the start control unit 20 shown in FIG. 1 ... Internal combustion engine vehicle device, 3 ... Internal combustion engine, 5 ... Friction clutch, 6 ... Automatic clutch device, 14 ... Accelerator pedal, 19 ... Start detection unit, 20 ... Start control unit, 31 ... ... target speed calculation unit, 32 ... changeover switch, 36 ... sudden deceleration detection unit, 39 ... target speed subtraction unit, Da ... target speed data, DS ... detection signal, A ...
... accelerator signal, Db ... output data, Ue ... second control signal.

Claims (1)

[Claims] Claims: 1. To start an internal combustion engine vehicle equipped with a clutch device configured to connect and disconnect a clutch in response to an electric signal, at least the clutch is operated by the clutch device. During the period
In a start control method for an internal combustion engine vehicle, which controls the speed of an internal combustion engine in relation to an operation amount of an accelerator operation member, when the accelerator operation member is operated in a deceleration direction during a starting operation of the vehicle, the clutch And a starting control method for an internal combustion engine vehicle, wherein the rotational speed of the internal combustion engine is reduced at a rate such that a large strain force is not generated in the drive system of the vehicle.