JPS5965626A - Control method for clutch - Google Patents

Abstract

PURPOSE:To prevent rushing out of a vehicle when an engine is brought to a stop under a condition except neutral state, by a method wherein a fluid discharge piping which is provided with a normally opened electromagnetic flow rate limit valve, being closed upon electrification thereof, is installed in the fluid operating circuit of an actuator. CONSTITUTION:An electromagnetic feed valve 7, located in a piping 4a, is closed usually and opened upon electrification thereof. A hydraulic operating chamber A of an actuator 3 is communicated with a first discharge piping 4b connected to a return piping 4d opened to an oil tank 8, and an electromagnetic discharge valve 9, which is closed usually and opened upon electrification thereof, is situated in the piping 4b. The hydraulic operating chamber A, located in parallel to the first discharge piping 4b, is communicated with a second discharge piping 4c connected to the return piping 4d, and an electromagnetic on-off valve 10 with a throttle, which is opened usually and closed upon electrification, is positioned in the piping 4c.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an automatic clutch that operates a dry single-plate clutch using a fluid pressure actuator.

This type of automatic clutch disengages the clutch by applying fluid pressure to a fluid pressure actuator.

When the fluid pressure is released, the clutch is engaged.
The supply and discharge of this fluid pressure is controlled by an electronic control device in accordance with vehicle conditions such as starting, stopping, and shifting during engine operation.

By the way, when the engine is stopped, that is, when the engine is parked or parked, the fluid pressure of the actuator is released in order to ensure the durability of the clutch components such as the clutch spring, hydraulic equipment, and sealing material. In order to prevent battery discharge, the power switch of the electronic control unit is linked to the ignition switch of the engine.

In this case, when the ignition switch is turned off to stop the engine, the current to the solenoid valve that applies fluid pressure to the actuator is immediately cut off, the fluid pressure in the actuator is released, and the clutch is suddenly engaged. On the other hand, even if the ignition switch is turned off, the engine continues to rotate for a short time due to inertia, so if the transmission is in a position other than neutral, the engagement of the clutch may cause a shock or cause the car to suddenly jump out. There is danger.

Therefore, in order to solve this problem, a delay circuit is installed in the electrical circuit of the electronic control unit to delay the release of the solenoid valve until the engine has completely stopped even after the ignition switch is turned off. The one that was made was
This method is proposed in Japanese Patent No.-13857.

However, this prior art requires a delay circuit, and the durability and reliability of this delay circuit are not necessarily satisfactory.

The present invention has been devised in view of the above points, and includes a fluid discharge pipe equipped with an electromagnetic flow rate limiting valve that is normally open to limit the flow rate and closed when energized, in the fluid operating circuit of the actuator. The purpose of the present invention is to provide a clutch control system that can prevent the vehicle from jumping out even if the engine is stopped when the transmission is in a state other than neutral.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In the figure, C11 is the engine flywheel, 2 is the dry single plate clutch, and the clutch brake l/-1-
2a, a clutch disc 2b disposed between the Brennoy plate 28 and the engine flywheel 1, a diaphragm spring 2C that presses the Brennoy, and the diaphragm spring. Clutch release bearing 2d that operates 2d, clutch release lever 2e that operates trial release bearing 2d, and the release L/bar 2.
a and a lever 2g connected at one end by a clutch shaft 2f.

6 is a clutch actuator, and the piston rod 3b of the piston 6a is rotatably connected to the other end of the lever 2g by a pin 3C. The clutch actuator hydraulic pressure chamber A is connected to a hydraulic pump 5, which is a hydraulic pressure source, through a pipe 4a.

6 is an accumulator disposed in the pipe 4a; 7
1 is an electromagnetic supply valve disposed in the pipe 4a, which is normally closed and opens when energized.

The hydraulic pressure chamber A of the actuator 3 is as follows.

It is connected to a first discharge pipe 4b which is connected to a return pipe 4d opened to the oil tank 8.

An electromagnetic discharge valve 9, which is normally closed and opens when energized, is disposed in the discharge pipe 4b.

The hydraulic action chamber A of the actuator 5 is.

Further, it is connected to a second discharge pipe 4C which is arranged in parallel with the first discharge pipe 4b and connected to the return pipe 4d, and there is normally an open circuit in the second discharge pipe 4C. An electromagnetic on-off valve 10 equipped with a throttle that closes when energized
is installed. The second discharge pipe 4C may be of any type as long as it has a function of limiting the amount of flowing oil. An orifice may be provided therein, and the pipe 4C itself may be made of a thin material. Further, the other chamber B of the actuator 3 is connected to the return pipe 4d.

Reference numeral 11 denotes an electronic control device composed of a microcomputer, which detects a clutch position sensor 12 disposed opposite a rod 3d connected to a piston 3a of the clutch actuator 3, and the rotation speed of the flywheel 1. Engine rotation sensor 15. accelerator pedal 1
Accelerator sensor 15 for detecting the operating position of 4. Vehicle speed sensor 18 that detects the rotation speed of the output shaft 17 of the transmission 16
The electromagnetic supply valve 7. Controls the electromagnetic discharge valve 9 and the electromagnetic on-off valve 10.

A power switch 19 is disposed in the wiring connecting the electronic control unit 11 and the power source 2o, and is interlocked with the ignition switch.

Next, the operation of the apparatus of the present invention will be explained.

Based on the speed change signal, the output from the electronic control device 11
The electromagnetic supply valve 7 is energized to open it, the % electromagnetic discharge valve 9 is de-energized to close it, and the electromagnetic shut-off valve 10 is energized to close it.

As a result, pressure oil is supplied from the achievator 6 to the hydraulic chamber A of the clutch actuator 3 via the electromagnetic supply valve 7, causing the piston 3a to move to the right and the clutch 2 to be disengaged.

After the clutch is disengaged, the predetermined speed change operation ends (!:'+!The magnetic supply valve 7 is energized and closed, and the electromagnetic discharge valve 9 is energized to open it, and as a result, the hydraulic pressure of the actuator 3 is reduced. Pressure oil in the working chamber A is discharged through the electromagnetic discharge valve 9,
Clutch 2 (closely engaged, and the vehicle will be driven in a new gear position.The speed at which the clutch is engaged may be controlled by pulse-controlling the energization to the electromagnetic exhaust valve 9, or by using the electromagnetic shut-off valve 10 in combination. , the valve can also be pulse-controlled to provide fine speed control.

Next, we will discuss the case where the engine is stopped after the vehicle has stopped.

In order to cut the power out of the vehicle, the vehicle speed is reduced, and if the vehicle speed is below 12I (IIVHr), the accelerator pedal is released, and the engine speed is 4.
00 rpm or less [In order to prevent engine stalling,
The output from the electronic control device 11 opens the electromagnetic supply valve 7 in the same manner as described above, and the '1δ magnetic discharge valve 9 and the electromagnetic shut-off valve 1 are opened.
0 is closed, the clutch actuator 5 is activated, the clutch 2 is disconnected, and the vehicle width is stopped. In this way, the clutch is disengaged when the vehicle is stopped, but when the ignition key is turned off to stop the engine, the power switch 19 linked to this is also turned off, so the electronic control unit 11 does not function. As a result, the magnetic supply valve 7, the electromagnetic discharge valve 9, and the electromagnetic shut-off valve 10 are not energized at the time 't. Therefore, only the electromagnetic on-off valve 10, which is a normally open valve, is opened, and the pressure oil in the hydraulic chamber A of the clutch actuator 3 is slowly discharged from this throttled on-off valve 10, so that the clutch 2 is slowly operated. As a result, when the clutch is engaged, the rotational inertia of the engine will no longer affect the transmission, even if the transmission is in reverse, for example, in first gear.

As explained above in detail, the present invention includes an electromagnetic on-off valve that is normally open and closes when energized in the hydraulic circuit for clutch operation. iii. Since a second discharge pipe is provided that communicates with the hydraulic pressure chamber of the clutch actuator and limits the flow rate, the first gear is in the reverse state without providing an electrical delay circuit as in the prior art. When attempting to park, it is possible to prevent the car from jumping out or knocking due to sudden engagement of the clutch when the engine is stopped.

or

[Brief explanation of the drawing]

The figure is a circuit diagram of the device u of the present invention. 1...Engine flywheel, 2...Clutch. 3...Clutch actuator, 4a...Piping, 4
b...First discharge pipe L 4b...Second discharge pipe, 5...Hydraulic pump% 6...Accumulator, 7...Electromagnetic supply valve, 8...Oil tank , 9...
・Solenoid discharge valve% 10, Solenoid on-off valve, 11...Electronic control device patent applicant Isuso Jidosha Co., Ltd. agent Patent attorney Tsuji 2 people other than the award

Claims (1)

[Claims] An electromagnetic supply valve, which is normally closed and closes when energized, is disposed in the piping that communicates the fluid pressure application chamber of the clutch actuator with the fluid pressure source, and the first discharge valve communicates with the fluid pressure application chamber. An electromagnetic discharge valve that is normally closed and closes when energized is disposed in the piping, and an electromagnetic on-off valve that is normally closed and closes when energized is connected to the fluid pressure action chamber of the clutch actuator to control the flow rate. 1. A clutch control device characterized in that a second discharge pipe for limiting the amount of water is disposed in parallel with the first discharge pipe.