JPH1068432A - Automatic clutch controller for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a clutch from being moved in the OFF direction by air leak when a car is parked with a gear engaged to improve reliability in parking with a gear engaged. SOLUTION: In a device for disconnecting a mechanical clutch when fluid pressure is supplied to a clutch actuator 55 and for connecting with the releasing of the supply, usual solenoid valves 80, 81 used usually in a usual circuit and changing fluid pressure in a supplying position, an exhausting position and a close position and emergency solenoid valves 84, 85 which are used in an emergency circuit and change fluid pressure in the exhausting position and the close position are provided. The usual solenoid valves 80, 81 are changed at the supplying position and the exhausting position in response to a driving state and is held at the close position when an engine key switch 103 is turned off and the emergency solenoid valves 84, 85 are changed at the close position when the engine key switch 103 is turned on and at the exhausting position when turned off. When the engine is stopped, the emergency solenoid valves 84, 85 are at the exhausting position to exhaust air and to connect and hold a clutch even if there is air leakage in the usual solenoid valves 80, 81.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an automatic clutch control device for a vehicle.

[0002]

2. Description of the Related Art In recent years, vehicles equipped with an automatic transmission for automatically performing a shift operation by interposing a torque converter between an engine and a transmission in order to reduce driver fatigue have been increasing. Since the torque converter is a fluid coupling, the transmission efficiency of the torque converter is inferior to that of the mechanical clutch, which is disadvantageous in terms of improving fuel efficiency.

Therefore, in order to improve the fuel efficiency as well as the ease of operation, a conventional transmission and a mechanical clutch are used, and the driver does not operate the clutch and the transmission, but automatically operates them by electronic control. The present applicant has proposed an automatic transmission in which a gearshift operation is performed (Japanese Utility Model Laid-Open No. 60-188637).

FIG. 2 is a diagram showing the overall structure of the engine. In this example, a fuel injection pump 41, a mechanical clutch 42, and a transmission 43 of a diesel engine 40 are provided with various detecting means for detecting their operating states and an actuator for driving them. And the automatic control circuit 60 controls the actuator based on signals from these detecting means to realize automatic shifting.

[0005] For automatic shifting, means for detecting an operating state is required. This operating state is determined from the engine load, the position where the select lever is engaged, the clutch engaged / disengaged state, the actual shift position of the transmission, and the vehicle speed. Can be.

For this reason, the accelerator pedal 45 has an accelerator sensor 50 for detecting the depression angle (accelerator opening) of the accelerator pedal 45 as an engine load, and the mechanical clutch 42 has a clutch stroke sensor for detecting the stroke of the clutch. 54 is a transmission 43 having a shift position sensor 58 for detecting an actual shift position.
A main shaft rotation sensor 56 for detecting the rotation speed of the main shaft connected to the rear axle via the propeller shaft 44 is provided.

Since the main shaft rotation speed is proportional to the vehicle speed, the main shaft rotation speed sensor 56 functions as a vehicle speed sensor.

Further, the synchronizing of the meshing gears is performed by driving the gear shift mechanism when the rotation speed of the main gear that idles on the main shaft enters a synchronization region provided with respect to the rotation speed of the main shaft. Need to detect speed.

In this case, the main gear is synchronously meshed with the counter shaft for transmitting the engine output.
The rotation speed of the counter shaft is also the rotation speed of the main gear, and therefore, a counter shaft rotation sensor 57 is provided. Reference numeral 48 denotes a shift selector that outputs a designated position signal of the select lever 49.

Next, the control lever of the fuel injection pump 41, as an actuator to be controlled by the automatic control circuit 60, is driven in response to these detection means, and the engine rotation and the required rotation are matched. Governor control device 53 for controlling engine rotation
However, the clutch 42 is provided with a clutch actuator 55 for connecting and disconnecting the clutch, and the transmission 43 is provided with a gear shift actuator 59 for driving a gear shift mechanism to perform gear shift setting.

An automatic control circuit 60 for controlling each of these actuators performs a shift, that is, a shift change, based on signals from an accelerator opening sensor 50 and the like as operating state detecting means and a main shaft rotation sensor 56 as vehicle speed detecting means. Is determined, and a shift control signal is output at the time of shifting. The governor control device 5 is controlled by this control signal.
3. Drive the clutch actuator 55 and the gear shift actuator 59 to increase or decrease the engine speed, disconnect or engage the clutch, and shift the gear to the next shift stage.

In this case, the automatic control circuit 60
For example, a manual control circuit 70 is provided in parallel so as to cope with a case where control becomes impossible due to a failure such as disconnection of a harness.

The manual control circuit 70 includes a changeover switch 71
When ~ 74 '(these switches are integrally switched) is set to the manual side, the drive of the clutch actuator 42 and the lever operation of the selector 48 are performed so that the clutch is connected or disconnected according to the switch operation of the clutch operation switch 75. Accordingly, the drive of gear shift actuator 59 is controlled so that the transmission is shifted to the designated shift stage.

The control lever of the fuel injection pump 41 is linked to the accelerator pedal 45 via the linkage 30 and operates according to the pedal opening during manual operation.

FIG. 3 is a schematic view showing the structure of the clutch actuator 55. In this case, there are provided air pressure supply and discharge solenoid valves 80 and 81 driven by the output signal of the automatic control circuit 60 or the manual control circuit 70. The clutch actuator 55 operates in the clutch disconnecting direction by the air pressure supplied when the solenoid valve 80 is turned on, and operates in the clutch contact direction via the return spring by discharging the air pressure when the solenoid valve 81 is turned on. It has become.

[0016]

In such an automatic transmission vehicle, for example, in parking with gears on a hill or the like, the solenoid valves 80 and 81 are both OFF and closed at this time. When the solenoid valve 80 generates air leakage, the leaked air pressure may cause the clutch actuator 55 to operate in the clutch disconnection direction.
In this case, there is a concern that the effect of geared parking is lost.

An object of the present invention is to solve such a problem.

[0018]

According to a first aspect of the present invention, there is provided a hydraulic clutch actuator for connecting and disconnecting a mechanical clutch. When a hydraulic pressure is supplied to the clutch actuator, the mechanical clutch is disconnected, and when the supply is released, the clutch is connected. In the automatic clutch control device for a vehicle configured as described above, a service circuit and an emergency circuit provided in parallel with each other for guiding fluid pressure to the clutch actuator, a position for supplying and discharging fluid pressure provided in the service circuit, and a supply / discharge position. A service clutch valve that switches to a position for shutting off the clutch, an emergency clutch valve that is provided in the emergency circuit and switches to a position for discharging fluid pressure and a position for shutting off, and supplies the service clutch valve according to the operating state. Position and the discharge position. When the engine key switch is turned off, the switch is held in the shut-off position. A blocking position at ON of the engine key switch a Tchibarubu comprises an automatic control circuit for switching to OFF at the discharge position.

According to a second aspect of the present invention, in the first aspect, a service supply solenoid valve which is disposed in parallel with each other as the service clutch valve and supplies fluid pressure when the valve is opened, and a service discharge valve which discharges fluid pressure when the valve is opened. An electromagnetic valve is provided, and an emergency open / close electromagnetic valve and a supply / discharge electromagnetic valve for selectively switching between supply and discharge positions of fluid pressure are provided as the emergency clutch valve, and the automatic control circuit includes a normal supply electromagnetic valve and The emergency discharge solenoid valve is opened and closed according to the operating condition and closed together when the engine key switch is turned off, while the emergency discharge solenoid valve is closed when the engine key switch is turned on and turned off.
Open the valve sometimes.

According to a third aspect of the present invention, there is provided an automatic vehicle having a hydraulic clutch actuator for connecting and disconnecting a mechanical clutch, wherein the mechanical clutch is disconnected when a fluid pressure is supplied to the clutch actuator, and the hydraulic clutch is connected when the supply is released. In the clutch control device, a service circuit and an emergency circuit provided in parallel with each other for guiding fluid pressure to the clutch actuator, and a position for supplying and discharging fluid pressure and a position for shutting off supply and discharge provided in the service circuit. A service clutch valve which is switched, an emergency clutch valve which is provided in the emergency circuit, and switches between a position for supplying and discharging fluid pressure and a position for shutting off, and a supply position and discharge for the service clutch in accordance with an operation state. Position and when the engine key switch is turned off, it is held in the shut-off position,
An automatic control circuit that switches the emergency clutch valve to the shut-off position when the engine key switch is turned on and a discharge position when the engine key switch is turned off, a manual circuit that selectively switches the emergency clutch valve by the clutch operation switch, and a manual control circuit that is connected to the power circuit An emergency main switch selectively connected, a relay circuit for opening the automatic control circuit and closing a manual control circuit when the emergency main switch is connected, and an automatic control for connecting to a power supply circuit via an engine key switch A backup power supply circuit connected to the circuit in parallel with the engine key switch.

According to a fourth aspect of the present invention, in the third aspect, the service clutch valve is a service supply solenoid valve which is disposed in parallel with each other and supplies fluid pressure when the valve is opened, and a service discharge solenoid valve which discharges fluid pressure when the valve is opened. An electromagnetic valve, an emergency on-off electromagnetic valve as the emergency clutch valve, and a supply / discharge electromagnetic valve for selectively switching between supply and discharge positions of fluid pressure are provided. The discharge solenoid valve is opened / closed according to the operation state and closed when the engine key switch is turned off, while the emergency opening / closing solenoid valve is closed when the engine key switch is turned on and opened when the engine key switch is turned off. A control circuit switches between an emergency opening / closing solenoid valve and a supply / discharge solenoid valve by a clutch operation switch, and the relay circuit operates when the emergency main switch is connected. While disconnecting the control circuit from the normal supply / discharge solenoid valve and the emergency opening / closing solenoid valve, and connecting the manual control circuit to the emergency opening / closing solenoid valve and the supply / discharge solenoid valve, the above-mentioned operation is performed when the emergency main switch is not connected. The automatic control circuit is connected to the normal supply / discharge solenoid valve and the emergency opening / closing solenoid valve, and the manual control circuit is disconnected from the emergency opening / closing solenoid valve and the supply / discharge solenoid valve is switched to the discharge position. .

[0022]

In the first to fourth aspects of the present invention, the normal solenoid valves (80) and (81) are operated by the automatic control circuit (60) during normal operation with the engine key switch (103) turned ON.
Is controlled according to the operation state, and since the solenoid valve (85) is closed at this time, the common circuit (83A)
The supply / discharge of air pressure to / from the clutch actuator (55) is controlled via the controller, and the mechanical clutch is connected / disconnected.

Turning off the engine key switch (103)
Sometimes, the emergency control valve (85) is opened by the automatic control circuit (60), and at this time, the solenoid valve (84) is in a non-energized state and is switched to the discharge position. (83B) is maintained in the pressure release position.

When the engine key switch (103) is turned off, the automatic control circuit (60) operates the solenoid valve (80).
The solenoid valves (80) and (81) are both closed in order to maintain a non-energized state with respect to (81). For this reason, if air leakage occurs in the solenoid valve (80), the normal circuit (83)
Even if air pressure leaks into A), it is released from the emergency circuit (83B) to the atmosphere, so that the clutch actuator (55) does not operate in the clutch disconnection direction due to air pressure.

However, reference numerals in parentheses are given corresponding to the embodiments.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 55 denotes a clutch actuator which disconnects the mechanical clutch when a fluid pressure is supplied and connects the mechanical clutch by a return spring when the fluid pressure is discharged. 8
An emergency circuit 83B is provided in parallel with 3A.

The service circuit 83A selectively opens and closes valves in response to an ON-OFF signal from an automatic control circuit 60 (automatic shift control is performed based on signals from various sensors for detecting an operation state as before). Solenoid valves 80 and 81 for supplying and discharging air pressure are provided in parallel to constitute a service clutch valve, and an emergency circuit 83B is provided with an on-off switch from a clutch operation switch 75A as a manual control circuit. A supply / discharge solenoid valve 84 that switches between a supply position and a discharge position of air pressure in response to an OFF signal, and a solenoid valve 85 that opens and closes in response to an ON-OFF signal from the automatic control circuit 60 or the clutch operation switch 75A are interposed in series. These constitute an emergency clutch valve.

The solenoid valves 81 and 84 are provided with orifices 86 and 87 for reducing the discharge flow rate of the air pressure. 8
Reference numeral 8 denotes a main reservoir for accumulating the air pressure from the compressor 89, 90 denotes a sub-reservoir, and 91 denotes a dryer.

The operating portions 80 of the solenoid valves 80 and 81
A, 94A drive circuits 92, 93 have relays 94 for opening and closing them, and both actuating parts 85A, 85A of the solenoid valve 85.
B driving circuits 95 and 96 include these in the automatic control circuit 60.
And a relay 97 selectively connected to the clutch operation switch 75A.
8 and 99 are connected to the emergency power supply circuit 100. Each of the solenoid valves 80, 81, 85 opens when energized,
Closes when not energized. The solenoid valve 84 switches to a fluid pressure supply position when energized, and to a discharge position when not energized.

An emergency main switch 101 is interposed in the emergency power supply circuit 100.
Is turned on (connected), the drive circuits 92 and 93 of the solenoid valves 80 and 81 are opened by the operation of the relay 94, and the drive circuits 95 and 96 of the solenoid valve 85 by the operation of the relay 97.
From the automatic control circuit 60 to the clutch operation switch 75A.
Switch to the side.

In this case, the clutch operation switch 75A is
The drive circuit 96 on the side of the operating portion 85B of the solenoid valve 85 at the clutch connection position is made so that the switching operation can be performed in three stages.
The drive circuit 102 of the operating portion 84A of the solenoid valve 84 is connected to the emergency power supply circuit 100 at the clutch disengaged position, and the drive circuit 95 of the operating portion 85A of the solenoid valve 85 at the clutch stopped position.

The automatic control circuit 60 is connected to a battery (power supply) 105 via a backup power supply circuit 104 in parallel with the engine key switch 103. When the engine key switch 103 is turned on, the solenoid valve 85 is closed, and the engine key switch 103 is turned off. To open the solenoid valve 85.

In such a configuration, during normal operation with the engine key switch turned ON, the opening and closing of the solenoid valves 80 and 81 are controlled by the automatic control circuit 60 according to the operating state. Is closed, the clutch actuator 5 is connected via the service circuit 83A.
5 is controlled to supply and discharge air pressure, and the mechanical clutch is disconnected.

When the engine key switch is turned off, the electromagnetic valve 85 is opened by the automatic control circuit 60. At this time, the electromagnetic valve 84 is in a non-energized state and has been switched to the discharge position. Are maintained in the pressure release position.

When the engine key switch is turned off, the automatic control circuit 60 maintains the non-energized state of the solenoid valves 80 and 81, so that the solenoid valves 80 and 81 are both closed.

Therefore, even if air leaks into the solenoid valve 80 and air pressure leaks into the service circuit 83A, this air is released from the emergency circuit 83B to the atmosphere. It does not operate in the clutch disengagement direction.

Therefore, in the parking with gears in which the vehicle is parked with the gears engaged, the clutch is not accidentally disconnected and the effect of the parking with gears can be maintained.

On the other hand, in this embodiment, even if the automatic control circuit 60 cannot perform the clutch disconnection control via the normal solenoid valves 80 and 81 due to a failure such as a disconnection of a harness, the emergency main switch is used. When 101 is turned ON, the drive circuits 92 and 93 of the solenoid valves 80 and 81 are opened to the automatic control circuit 60 by the operation of the relay 94, and the drive circuit 95 of the solenoid valve 85 is operated by the operation of the relay 97.
Since 96 switches to the clutch operation switch 75A side, the clutch can be disconnected, connected, and stopped by the switching operation of the clutch operation switch 75A.

That is, when the clutch operation switch 75A is turned to the clutch engagement position, the solenoid valve 85 is actuated by the operating portion 85.
B is opened by energization, and the solenoid valve 84 is at the position for discharging air pressure. To release the air pressure, the clutch actuator 55 is operated in the clutch connection direction by the return spring.

When the clutch operation switch 75A is switched to the clutch disengaged position, the solenoid valve 85 is opened, and the solenoid valve 84 is switched to the air pressure supply side by energizing the operating portion 84A. 55 disconnects the clutch by the air pressure supplied via the solenoid valves 84 and 85. Further, when the clutch operation switch 75A is turned to the clutch stop position, the electromagnetic valve 85 closes by energizing the operating portion 85A, and the operation of the clutch actuator 55 is stopped.

In the above-described embodiment, the emergency solenoid valves 84 and 85 are arranged in series in order to enable manual clutch operation. Only the solenoid valve 85 may be provided so that it can be switched between the discharge position and the shutoff position.

Further, according to this embodiment, since the ordinary solenoid valve 80 and the emergency solenoid valve 85 are located in parallel, the supply and discharge of air pressure to and from the clutch actuator 55 are controlled independently of each other. Since it is possible, there is no possibility that the operation of the clutch becomes inoperable due to the entry of foreign matter into the piping, and highly reliable clutch control becomes possible.

[0044]

As described above, according to the present invention, when the engine key switch is turned off, such as when the vehicle is parked, the service clutch valve for controlling the clutch actuator may leak and air pressure may leak. However, since the emergency clutch valve is in the discharge position and discharges the air pressure, the clutch actuator does not operate in the clutch disengagement direction, and the reliability of the geared parking can be improved.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram showing an embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing a conventional technique.

FIG. 3 is a configuration diagram of a clutch actuator.

[Explanation of symbols]

 55 clutch actuator 60 automatic control circuit 75A clutch operation switch 80, 81 service solenoid valve 84, 85 emergency solenoid valve 94, 97 relay 101 emergency main switch 103 engine key switch 104 battery power supply circuit 105 battery

Claims (4)

[Claims] An automatic clutch control device for a vehicle, comprising a hydraulic clutch actuator for connecting and disconnecting a mechanical clutch, wherein the hydraulic clutch is disconnected when a hydraulic pressure is supplied to the clutch actuator, and is connected when the hydraulic clutch is released. A service circuit and an emergency circuit provided in parallel with each other for guiding fluid pressure to the clutch actuator; and a service clutch provided in the service circuit for switching between a position for supplying and discharging fluid pressure and a position for interrupting supply and discharge. A valve, an emergency clutch valve that is provided in the emergency circuit and switches between a position where the fluid pressure is discharged and a position where the fluid pressure is cut off, and a position where the service clutch valve is switched between a supply position and a discharge position according to an operation state and an engine key. Switch off
Sometimes, the emergency clutch valve is held in the shut-off position while the emergency clutch valve is turned to the shut-off position when the engine key switch is turned on.
An automatic control circuit for a vehicle, comprising: an automatic control circuit that sometimes switches to a discharge position. 2. A service supply solenoid valve which is disposed in parallel with each other as said service clutch valve and supplies a fluid pressure when the valve is opened, and a service discharge solenoid valve which discharges the fluid pressure when the valve is opened, further comprising the emergency clutch. An emergency opening / closing solenoid valve and a supply / discharge solenoid valve for selectively switching between supply and discharge positions of fluid pressure are provided as valves, and the automatic control circuit sets the regular supply solenoid valve and the regular discharge solenoid valve in accordance with an operation state. 2. The automatic clutch control device for a vehicle according to claim 1, wherein the emergency discharge solenoid valve is closed when the engine key switch is turned on, and is closed when the engine key switch is turned off, while being closed when the engine key switch is turned off. 3. An automatic clutch control device for a vehicle, comprising: a hydraulic clutch actuator for connecting and disconnecting a mechanical clutch, wherein the mechanical clutch is disconnected when a fluid pressure is supplied to the clutch actuator, and connected when the supply is released. A service circuit and an emergency circuit provided in parallel with each other for guiding fluid pressure to the clutch actuator; and a service clutch provided in the service circuit for switching between a position for supplying and discharging fluid pressure and a position for interrupting supply and discharge. A valve, an emergency clutch valve provided in the emergency circuit for switching between a position for supplying fluid pressure, a position for discharging, and a position for shutting off; and a position for switching the service clutch between a supply position and a discharge position according to an operation state. When the engine key switch is turned off, the engine is held in the shut-off position while the emergency clutch valve is An automatic control circuit that switches to the cut-off position when the key switch is ON and a discharge position when the key switch is OFF, a manual circuit that selectively switches the emergency clutch valve by the clutch operation switch, and an emergency circuit that selectively connects the manual control circuit to the power supply circuit A relay circuit for opening the automatic control circuit to close the manual control circuit when the emergency main switch is connected, and an engine key switch for the automatic control circuit connected to the power supply circuit via the engine key switch. An automatic clutch control device for a vehicle, comprising: a backup power supply circuit connected in parallel. 4. A service supply solenoid valve which is disposed in parallel with each other as said service clutch valve and supplies a fluid pressure when the valve is opened, and a service discharge solenoid valve which discharges the fluid pressure when the valve is opened. An emergency opening / closing solenoid valve and a supply / discharge solenoid valve for selectively switching between supply and discharge positions of fluid pressure are provided as valves, and the automatic control circuit opens and closes the regular supply solenoid valve and the regular discharge solenoid valve according to the operation state. When the engine key switch is turned off, the emergency opening / closing solenoid valve is closed when the engine key switch is turned on and is opened when the engine key switch is turned off. The solenoid valve is switched by the clutch operation switch.
Further, the relay circuit cuts off the connection between the automatic control circuit and the regular supply / discharge solenoid valve and the emergency opening / closing solenoid valve when the emergency main switch is connected, and the manual control circuit and the emergency opening / closing solenoid valve and the supply / discharge solenoid valve. While the valve is connected, when the emergency main switch is not connected, the automatic control circuit is connected to the regular supply / discharge solenoid valve and the emergency opening / closing solenoid valve, and the connection between the manual control circuit and the emergency opening / closing solenoid valve is cut off. 4. The automatic clutch control device for a vehicle according to claim 3, wherein the supply / discharge solenoid valve is switched to a discharge position.