JP3829006B2 - Clutch connection / disconnection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clutch connecting / disconnecting device having an electromagnetic valve in a hydraulic system, and more particularly to a clutch connecting / disconnecting device that prevents overloading and erroneous diagnosis of the electromagnetic valve.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a so-called auto clutch device is known in which an actuator is combined with a friction clutch to automatically connect and disconnect the clutch. In addition to this automatic connection / disconnection, a so-called semi-automatic clutch device has also been proposed that enables manual connection / disconnection using a clutch pedal.
[0003]
[Problems to be solved by the invention]
By the way, in the case of such a semi-automatic clutch device, the clutch is configured to be interlocked with the pedal depression and mechanically so that manual connection / disconnection is possible. Even when the driver does not intentionally depress the pedal, but when he / she puts his / her foot on the pedal unintentionally, the pedal is mechanically depressed, which affects clutch control.
[0004]
In this case, each unit operating for automatic connection / disconnection cannot easily achieve the target operation, resulting in an overload or malfunction. Then, the self-diagnosis function works, and it is possible that a failure is judged even though it is not actually a failure.
[0005]
It is desirable that the semi-auto clutch device is capable of preventing overload and misdiagnosis due to automatic / manual mutual interference and smoothly returning to the normal automatic / manual state from the interference state.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a clutch connecting / disconnecting device that solves the above-described problems and prevents electromagnetic valve overload and erroneous diagnosis.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is urged toward the first piston and the first piston moved in conjunction with the depression of the pedal in the hydraulic cylinder that controls the stroke of the clutch fork that engages and disengages the clutch. In order to move the second piston in the clutch disengagement direction, a hydraulic pump that injects oil between the two pistons is provided, and the second piston is moved between the pistons in the clutch contact direction. If an electromagnetic valve that releases the oil is provided, and the energizing time of the electromagnetic valve exceeds a predetermined time before the desired stroke is not obtained , it is determined by the pedal switch whether the clutch pedal is released. the energization is stopped, subsequent, provided an electromagnetic valve protection means for inhibiting the energization of the solenoid valve, when the solenoid valve energization time has exceeded a predetermined time, If latch pedal is disengaged, but determines that the failure of the solenoid valve.
[0009]
If the hydraulic pump is driven after energization of the electromagnetic valve is prohibited, the energization prohibition may be canceled.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0011]
As shown in FIG. 1, a clutch connecting / disconnecting device of the present invention includes a clutch 1 that transmits engine rotation to a transmission, and a clutch fork 2 that is mechanically connected to the clutch 1 to move the clutch 1 in the connecting / disconnecting direction. A slave cylinder 3 that accommodates a piston provided at one end of the clutch fork 2, an intermediate cylinder 4 that provides hydraulic pressure to the slave cylinder 3 to control the stroke of the clutch fork 2, and is arranged in tandem in the intermediate cylinder 4 The first and second pistons 5 and 6, the hydraulic pump 7 for injecting oil between the pistons 5 and 6, the electromagnetic valve 8 for releasing the oil between the pistons 5 and 6, the second piston 6 on the first piston 5 side Spring 9 to be pressed against, clutch pedal 10 used for manual connection / disconnection, and transmission amount of clutch pedal 10 to first piston 5 It is equipped with a manual operation for the transmission system 11 that. A hydraulic oil tank 12 stores hydraulic oil, and a relief valve 13 operates at an abnormally high pressure. The low pressure sides of the hydraulic pump 7, the electromagnetic valve 8 and the relief valve 13 are connected to a common low pressure circuit 14, and the operating oil tank 12 is provided in the low pressure circuit 14. The head portion of the intermediate cylinder 4 communicates with the low pressure circuit 14 when the second piston 5 is in the illustrated position.
[0012]
As an electrical system for clutch connection / disconnection control, an electronic control unit (ECU) (not shown) that controls a motor for driving a hydraulic pump and an electromagnetic valve, a pedal switch 15 for recognizing whether or not the clutch pedal 10 is released, and a stroke amount of the clutch fork 2 Stroke sensor 16 that detects (position), and hydraulic pressure that switches when the clutch fork 2 starts to move away from the fully engaged position by detecting the pressure of the head portion of the intermediate cylinder 4 or when the clutch fork 2 approaches the fully engaged position of the clutch. A switch 17 and a motor 18 for driving the hydraulic pump are provided. The electromagnetic valve protection means of the present invention is accommodated in the ECU. The electromagnetic valve 8 is a so-called normally closed valve that opens the flow path when energized and closes the flow path when not energized.
[0013]
First, normal operation of the clutch connecting / disconnecting device will be described.
[0014]
When the clutch pedal 10 is in the released state, the first piston 5 is positioned at one end of the intermediate cylinder 4, and the second piston 5 is pushed toward the first piston 5 by the spring 9. In the manual connection / disconnection, as shown in FIG. 2, when the clutch pedal 10 is depressed, the first piston 5 pushes the second piston 6 and moves the second piston 6 in the clutch disengagement direction. The hydraulic pressure is applied to the clutch fork 2 and the clutch disengagement is achieved. When the clutch pedal 10 is gradually released, the first piston 5 and the second piston 6 are pushed back by a spring (a clutch spring such as a diaphragm) provided in the clutch and the spring 9. As a result, the clutch fork 2 gradually returns to the original position, and complete clutch engagement is achieved via the half clutch.
[0015]
In the automatic connection / disconnection, it is assumed that the clutch pedal 10 is in a released state in a normal operation. As shown in FIG. 3, by driving the hydraulic pump 7, oil is injected between the pistons 5 and 6, and the pressure between the pistons becomes high. For this reason, the second piston 6 moves in the clutch disengagement direction. The oil pressure is applied to the slave cylinder 3, the clutch fork 2 moves, and the clutch disengagement is achieved. In the clutch engagement control, as shown in FIG. 4, by energizing the electromagnetic valve 8, the pistons are connected to the low pressure circuit 14 to release the oil between the pistons. The second piston 6 is pushed back in the clutch contact direction by the clutch spring and the spring 9, and the oil between the pistons 5 and 6 escapes through the electromagnetic valve 8. As a result, the clutch fork 2 gradually returns to the original position, and complete clutch engagement is achieved via the half clutch. The stroke speed of the clutch fork 2, that is, the clutch connection speed can be controlled by opening and closing the electromagnetic valve 8 with an arbitrary duty ratio. Further, in the automatic connection / disconnection, the stroke amount of the clutch fork 2 is detected by the stroke sensor 16, and the half clutch point can be recognized or the clutch complete engagement can be recognized by this stroke amount.
[0016]
Next, the electromagnetic valve protection operation will be described.
[0017]
In the normal operation of the automatic connection / disconnection of the clutch connection / disconnection device, when the electromagnetic valve 8 is energized from the state of clutch disconnection, the oil between the pistons 5 and 6 will naturally escape through the electromagnetic valve 8, so the clutch fork A desired stroke should be obtained for 2. However, when the electromagnetic valve 8 is out of order, the oil between the pistons 5 and 6 is not released even when energized, so the high pressure between the pistons 5 and 6 is maintained and the second piston 6 is not pushed back. . In this case, a desired stroke cannot be obtained in the clutch fork 2 even if time elapses. Therefore, if the energization time of the electromagnetic valve 8 exceeds a predetermined time before the stroke amount detected by the stroke sensor 16 becomes a desired value, it can be considered that the electromagnetic valve 8 is out of order.
[0018]
However, when the driver unconsciously places his / her foot on the pedal, that is, when the foot is placed, the first piston 5 is located away from one end of the intermediate cylinder 4, thereby preventing the second piston 6 from returning. Then, even if the energization time of the electromagnetic valve 8 elapses, a desired stroke cannot be obtained in the clutch fork 2. Since the electromagnetic valve 8 has not failed, the determination of failure is an error. However, if energization is continued as it is, the electromagnetic valve 8 may be overheated.
[0019]
Therefore, it is determined by the electromagnetic energizing time of the valve 8 is a predetermined time, for example, when more than 2 seconds, the pedal switch 15 whether the clutch pedal 10 is either released state while the desired stroke can not be obtained. If the clutch pedal 10 is in a released state, it is not a footrest, so it is determined that the electromagnetic valve 8 has failed, the energization of the electromagnetic valve 8 is stopped, and the driver is troubled by a display device (not shown). Inform. If the clutch pedal 10 is not in the released state, it is a footrest, so energization of the electromagnetic valve 8 is stopped, and energization of the electromagnetic valve 8 is prohibited after heeling. When the energization of the electromagnetic valve 8 is stopped, the second piston 6 does not move in the clutch engagement direction, and the complete clutch engagement is not achieved. When the complete clutch engagement is not achieved, the driver releases his / her foot from the clutch pedal 10 according to the driving feeling, so that the footrest is eliminated and the complete clutch engagement is achieved. Even if the footrest is eliminated, it is not preferable to immediately energize the electromagnetic valve 8 because it has just been energized for a predetermined time. Therefore, energization after dredging is prohibited.
[0020]
The prohibition of energization of the electromagnetic valve 8 is not canceled until the hydraulic pump 7 is next driven. The hydraulic pump 7 is always driven when the clutch is disengaged. Therefore, when the hydraulic pump 7 is driven, a new clutch is disengaged. On the contrary, new clutch disengagement is not performed until the hydraulic pump 7 is driven. Therefore, the energization prohibition is canceled when the hydraulic pump 7 is driven.
[0021]
FIG. 5 shows a control flow. First, in the clutch engagement process of FIG. 5A, the ECU energizes the electromagnetic valve 8 in response to a clutch engagement command, and waits for the stroke sensor 16 to detect complete clutch engagement. If the stroke amount detected by the stroke sensor 16 indicates that the clutch is fully engaged while the energization time of the electromagnetic valve 8 does not exceed the predetermined time, the control is terminated normally. When the energization time of the electromagnetic valve 8 exceeds a predetermined time, it is determined by the pedal switch 15 whether or not the clutch pedal 10 is in the released state. If the clutch pedal 10 is in the released state, it is determined that the electromagnetic valve 8 has failed. If the clutch pedal 10 is not in the disengaged state, an energization prohibition flag designating prohibition of energization of the electromagnetic valve is set. This energization prohibition flag is referred to by other control routines. As a result, energization after the start is prohibited.
[0022]
Thereafter, if the energization prohibition flag is set in the prohibition release processing of FIG. 5B, it is determined whether or not the motor 18 of the hydraulic pump 7 is energized. If the motor 18 has been energized, the energization prohibition flag is cleared.
[0023]
【The invention's effect】
The present invention exhibits the following excellent effects.
[0024]
(1) Since a failure of an electromagnetic valve is distinguished from a footrest, a correct diagnosis can be made.
[0025]
(2) Since the solenoid valve is not energized continuously for a long time, it is protected from overheating and durability is ensured.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a clutch connecting / disconnecting device showing an embodiment of the present invention.
FIG. 2 is an operation diagram at the time of manual disconnection of the clutch connecting / disconnecting device of FIG. 1;
FIG. 3 is an operation diagram at the time of automatic disconnection of the clutch connecting / disconnecting device of FIG. 1;
4 is an operation diagram of the clutch connecting / disconnecting device of FIG. 1 during automatic contact.
FIG. 5 is a control flowchart of the clutch connecting / disconnecting device of the present invention, where (a) shows a clutch engagement process and (b) shows a prohibition release process.
[Explanation of symbols]
1 Clutch 2 Clutch fork 4 Intermediate cylinder 5 First piston 6 Second piston 7 Hydraulic pump 8 Electromagnetic valve 9 Spring 10 Clutch pedal 15 Pedal switch 16 Stroke sensor

Claims (2)

In the hydraulic cylinder that controls the stroke of the clutch fork that connects and disconnects the clutch, the first piston that is moved in conjunction with the depression of the clutch pedal and the second piston that is biased toward the first piston are arranged in a column, In order to move the second piston in the clutch disengagement direction, a hydraulic pump that injects oil between both pistons is provided, and in order to move the second piston in the clutch contact direction, an electromagnetic valve that releases oil between both pistons is provided, If the energization time of the solenoid valve exceeds the predetermined time before the desired stroke is obtained , it is determined by the pedal switch whether the clutch pedal is released or not. If not, the energization is stopped. the electromagnetic valve protection means for inhibiting the energization provided, when the solenoid valve energization time has exceeded a predetermined time, the clutch pedal is released form If the clutch engaging and disengaging apparatus characterized by determining a failure of the solenoid valve. Wherein after prohibiting the energization of the solenoid valve, the When the hydraulic pump is driven, the clutch engaging and disengaging device according to claim 1, characterized in that to release the energization prohibited.

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