JPS6229432A - Clutch control device for car - Google Patents

Abstract

PURPOSE:To exercise the engine brake and transfer to a smooth running condition, by keeping the clutch connected when the accelerator pressing amount is zero and a car speed is increasing from zero, and allowing a normal clutching operation when the accelerator pedal is pressed, in a down slope, for example. CONSTITUTION:To the MPU 1 are input detected signals of a stroke sensor 4 to detect the pressing of the accelerator pedal 3, a rotation speed detecting sensor 7 to detect the rotation speed of a propeller shaft, a transmission position sensor 11, and an engine rotation speed sensor 13. When the pressing amount of the accelerator is zero and the rotation speed of the propeller shaft is increasing from zero, that is, the car is running by inertia on a down slope, for example, the MPU 1 controls an electromagnetic valve 10 to make a clutch 8 in the connected condition through an actuater 9. On the other hand, when the accelerator pedal 3 is pressed down, the clutch 8 is controlled to connect and disconnect in an ordinary speed change program.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clutch control device for an automobile equipped with a mechanical automatic transmission. In particular, the present invention relates to a clutch control device that can bring a clutch into an engaged state without depressing an accelerator pedal when a vehicle starts moving from a stopped state.

[Conventional technology]

Conventionally, in mechanical automatic transmissions, the clutch is connected for the first time when the accelerator pedal is pressed to start, transmitting engine torque to the drive shaft. At this time, the clutch is engaged through a half-clutch state so that the rotational speed of the drive shaft changes gradually. When driving, when the accelerator pedal is released, the clutch remains engaged and engine braking is applied. When the brake pedal is depressed and the vehicle speed further decreases to below a predetermined speed, the clutch becomes disengaged. When the accelerator pedal is pressed again, the appropriate transmission gear is selected and shifted depending on the vehicle speed at that time.

Thereafter, the gears are automatically changed according to the engine rotation speed, vehicle speed, and amount of depression of the accelerator pedal.

In this way, the mechanical automatic transmission is structured so that the vehicle will not start or shift unless the accelerator is depressed.

[Problem that the invention seeks to solve]

However, with conventional mechanical automatic transmissions like this, even if a vehicle stopped on a slope releases the brake and coasts, the clutch does not engage unless the accelerator pedal is depressed, so the engine brake does not work. If you press the accelerator pedal after coasting for a certain amount of time, the clutch may feel uncomfortable, resulting in a poor operating feel.

In addition, if the accelerator pedal is not depressed and the vehicle is moving, the clutch will be engaged and the gears will be shifted if the vehicle is in motion. If the vehicle is moving, the clutch will be engaged and the gears will be shifted even when the vehicle is slowing down to stop. However, there was a problem in that the engine brake was applied inadvertently, which worsened the operating feel.

The present invention solves these conventional problems,
To provide a clutch control device for an automobile capable of applying an engine brake by connecting a clutch even if the accelerator pedal is not depressed when the vehicle starts moving from a stopped state.

Means for Solving Problem C] The present invention incorporates instruction information of the variable range of the transmission gear, engine rotation speed information, vehicle speed, and accelerator depression amount,
A clutch control device for an automobile includes control means for switching the connection state of the clutch, the amount of fuel supplied to the engine, and the transmission gear connected to the engine output shaft. Do you keep the clutch engaged when the speed increases from zero? 11.

[For production]

The present invention is applicable when the accelerator depression amount is zero and the vehicle speed increases from zero, for example, when the brake is released while the vehicle is stopped on a slope and the vehicle has started coasting. , engine braking can be applied by keeping the clutch engaged, allowing a smooth transition to acceleration when the accelerator pedal is depressed.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, a stroke sensor 4 for detecting the amount of depression of an accelerator pedal 3 is connected to a microprocessor 1 via an input/output control device 2.
, a rotational speed detection sensor 7 that detects the rotational speed of the output shaft 6 of the mechanical automatic transmission 5, and a solenoid valve 10 that drives and controls an actuator 9 that connects and disconnects the clutch 8.

Furthermore, a transmission position sensor 11 that detects the gear position of the mechanical automatic transmission 5, a rotation speed sensor 13 that detects the rotation speed of the engine 12, an injection pump 14 that is interlocked with the accelerator pedal 3, and the like are also connected. A mechanism for switching gears of the automatic transmission 5 is omitted in the drawing.

Normally, the microprocessor 1 processes the amount of depression of the accelerator pedal 3 detected by the stroke sensor 4 and the output shaft 6 detected by the rotation speed detection sensor 7 when the clutch is engaged or disengaged.
The clutch connection state is controlled so that the rotational speed of the output shaft 6 changes gradually.

FIG. 2 is a flowchart illustrating the operation of the apparatus according to the embodiment of the present invention.

The microprocessor 1 takes in vehicle speed information from the vehicle speed sensor 7 and accelerator depression amount information from the stroke sensor 4, and when the accelerator depression amount is zero and the vehicle speed is increasing from zero, that is, the vehicle speed is When the flag is not zero and the stop flag is "1", the clutch is controlled to be in the engaged state. The stop flag is set to "1" when the vehicle stops, and is reset to "0" when the clutch is engaged. When the accelerator pedal 3 is depressed, the clutch connection/disconnection is controlled according to a normal gear shift operation program.

〔Effect of the invention〕

As explained above, when the vehicle starts moving from a stopped state without depressing the accelerator pedal, the clutch can be engaged and engine braking can be applied, so the next time the accelerator pedal is depressed, the engine brake can be applied smoothly. can be accelerated. Therefore, in addition to normal starting and shifting operations, there is an effect that safe starting is possible and a good operational feel is achieved regardless of the operating procedure when starting a vehicle stopped on a slope or the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a flowchart explaining the operation of the apparatus according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Microprocessor, 2... Input/output control device, 3... Accelerator pedal, 4... Stroke sensor, 5... Mechanical automatic transmission, 6... Output shaft, 7...
・Rotational speed detection sensor, 8...Clutch, 9...Actuator, 10...Solenoid valve, 11...Transmission position sensor, 12...Engine, 13...
Rotational speed sensor, 14...injection pump. Patent Applicant Hino Motors Co., Ltd. Agent Patent Attorney Naotaka Ide M2 Figure

Claims (1)

[Claims] (1) It takes in the instruction information of the variable range of the transmission gear, the engine rotation speed information, the vehicle speed, and the amount of accelerator pedal depression, and switches the clutch connection state, the amount of fuel supplied to the engine, and the transmission gear connected to the engine output shaft. A clutch control device for an automobile including a control means, characterized in that the control means includes means for controlling the clutch to be in an engaged state when the amount of accelerator depression is zero and the vehicle speed increases from zero. Automobile clutch control device.