JPH0647139Y2 - Clutch controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a clutch control device that performs a clutch connection / disconnection operation by a hydraulic actuator.

(Prior Art) A block diagram of a conventional clutch control device is shown in FIG.

In the figure, reference numeral 1 denotes a hydraulic cylinder for controlling engagement / disengagement of a clutch, which is a normally closed disconnection valve 3 for allowing hydraulic oil from a pump 6 to flow into a cylinder chamber a, and hydraulic oil to a tank 7. The connection valves 4 and 5 for returning are connected. The contact valve 4 is normally open and is provided with a throttle for limiting the flow rate. The contact valve 5 is normally closed. When hydraulic oil flows into the cylinder chamber a through the disconnecting valve 3, the piston 2 operates to the right and the clutch (not shown) is disengaged. Since a clutch spring that operates to keep the clutch in a constant contact state is built into the inside of the clutch, the oil pressure in the cylinder chamber a is stored in the tank 7.
When the clutch spring is opened, the piston 2 moves to the left by the action of the clutch spring, and the hydraulic oil in the cylinder chamber a is discharged to the tank 7 via the contact valves 4 to 5. Therefore, the clutch will be in the contact state, but when regulating the contact speed,
When the hydraulic oil is returned to the tank 7 only through the contact valve 4 with the throttle, and the contact valve 5 is quickly brought into the contact state, the contact valve 5 is used.
Back through.

(Problems to be Solved by the Invention) In such a conventional clutch control device, even if any one valve of the disconnecting valve 3, the connecting valve 4, and the connecting valve 5 fails, the clutch connecting There is a problem that disconnection control cannot be performed. Further, there is a problem that the thrust of the actuator is insufficient due to the hydraulic pressure leak from the pipe line, and the sliding resistance is increased due to the increase of the viscosity of the working oil in cold weather, and the thrust of the actuator is insufficient.

The present invention has been made in view of the above points, and controls the clutch so that the vehicle can travel safely even if one of the three valves falls into an inoperable state due to a failure or the like, and An object of the present invention is to provide a clutch control device that compensates for the reduced thrust of the actuator when the hydraulic pressure leaks from the pipeline or when the viscosity of the working fluid increases in cold weather.

(Means for Solving the Problems) According to the present invention, the clutch spring is operated by disengaging the clutch by the fluid pressure actuator that operates by the fluid pressure applied by switching the valve, and reducing the fluid pressure by switching the valve. In a clutch control device for performing a clutch connection operation by force, an emergency actuator connected to a piston of the fluid pressure actuator and an emergency actuator provided on a side of the emergency actuator that operates the piston in a clutch disengagement direction. Valve means, detecting means for detecting a failure of the valve for operating the fluid pressure actuator, and operating means for operating the emergency valve means to disconnect the clutch when the detecting means detects a failure of the valve. A clutch control device characterized by being provided can be provided.

(Operation) In the clutch control device of the present invention, one of the three valves for connection and disconnection, which controls the inflow and outflow of the working fluid to and from the fluid pressure actuator for engaging and disengaging the clutch, is damaged due to a failure or the like. Even if it falls into the inoperable state, the clutch is controlled so that the vehicle can travel safely by the emergency valve means that operates the emergency actuator connected to the piston of the actuator, and the hydraulic pressure leaks from the pipeline or the cold weather. At times, it has the effect of assisting the thrust of the actuator.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing a clutch control device according to the present invention.

The piston 2 of the hydraulic cylinder 1 has, on the one hand, a link 13
The engine 11 is connected to the transmission 14 via the clutch 10. The cylinder 1 and the piston 2 constitute a fluid pressure actuator. The other side of the piston 2 penetrates the emergency cylinder 22 and is connected to the potentiometer 9. A step is provided in the shaft portion of the piston 2 at an internal position of the emergency cylinder 22, which penetrates the emergency piston 21 that drives the piston 2 only in the right direction in the drawing. The emergency piston 21
And the emergency cylinder 22 constitute an emergency actuator. The pump 6 and the cylinder chamber a of the hydraulic cylinder 1 are connected via a normally closed shutoff valve 3, and the cylinder chamber a
The intermediate portion of the disconnection valve 3 and the tank 7 are connected to each other through a parallel circuit of a normally open connection valve 4 with a throttle and a normally closed connection valve 5. The emergency cylinder chamber b is always opened to the tank 7 through an emergency valve 8 which is a three-way valve and a throttle. When the emergency valve 8 is activated, it is insulated from the tank 7 and the throttle and connected to the pump 6. . The disconnection valve 3, the connection valve 4, the connection valve 5, and the emergency valve 8 are connected to the control unit 12 and are operated by a signal from the control unit 12. The position signal from the potentiometer 9 for detecting the connection state of the clutch 10 is input to the control unit 12 via the other piston 2.

Next, the operation of the clutch control device according to the present invention will be described. The contact valve 4 is maintained in the closed state while the vehicle is traveling. Then, the shift is determined from the vehicle speed and the engine speed, and if the shift is different from the current shift, it is necessary to change the shift. The clutch must be disengaged when changing gears. When the control unit 12 determines that a shift change is to be performed, a signal is output to the disconnection valve 3 to open it. Then, the hydraulic oil from the pump 6 flows into the cylinder chamber a through the valve, operates the piston 2 to the right, and disconnects the clutch 10. After confirming that the clutch 10 is in the disengaged state by the position signal from the potentiometer 9, the shift change is performed. When the shift change is completed, the signal output to the disconnecting valve 3 is stopped and the connecting valve 4 is opened. Then, due to the action of the clutch spring inside the clutch 10, the clutch 10 operates in the contact direction, and the hydraulic oil in the cylinder chamber a is discharged to the tank 7 via the disconnection valve 4. A throttle is attached to the contact valve 4, the discharge speed is restricted, and the contact speed of the clutch 10 is restricted. It is necessary to quickly engage the clutch 10 when the vehicle suddenly starts up or runs at a high speed. In that case, a signal is output to the engagement valve 5 to open the clutch 10 and the discharge speed from the cylinder chamber a to the tank 7 is increased. To increase. Further, in the case of the half-clutch state, all the three valves are closed at the position where the position signal of the piston 2 detected by the potentiometer 9 matches a predetermined value, and the piston 2 is closed.
Hold the position of.

Even if one of the three valves fails during control of the clutch, the clutch cannot be controlled. Whether or not the control is impossible can be detected by the disagreement between the position signal of the piston 2 corresponding to the signal output state to the three valves and the position signal from the potentiometer 9. control unit
When the uncontrollable state is detected at 12, the driver is informed of the occurrence of the failure by a notification means such as a lamp, and at the same time, all the three valves are opened. And emergency valve 8
Is operated to cause hydraulic oil to flow into the emergency cylinder chamber b. By this operation, the piston 2 operates in the right direction and the clutch 10 is disengaged regardless of which of the three valves 3, 4, 5 is out of order. When the disconnection state is confirmed by a signal from the potentiometer 9, the contact valve 3 is closed and the contact valves 4 and 5 are opened. That is, the signal is output only to the contact valve 5 among the three valves. Control of the clutch after this state is performed by holding the signal output to the contact valve 5 and using only the emergency valve 8.

Since various different embodiments can be easily constructed without departing from the spirit of the present invention, the present invention is not limited to a specific embodiment other than the limitation described in the above-mentioned utility model registration claim. Absent.

(Effects of the Invention) As described above, according to the present invention, any one of the three valves for connection and disconnection that controls the inflow and outflow of the working fluid to and from the fluid pressure actuator for engaging and disengaging the clutch is provided. Even if the valve becomes inoperable due to a malfunction or the like, the clutch is controlled so that the vehicle can travel safely by the emergency valve means that operates the second fluid pressure actuator connected to the piston of the actuator, and the clutch is controlled from the pipeline. It is possible to provide a clutch control device that supplements the thrust of the actuator when hydraulic pressure leaks or during cold weather.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional clutch control device. 1 ... hydraulic cylinder, 2 ... piston, 3 ... break valve, 4 ... contact valve, 5 ... contact valve, 6 ... pump, 7 ... tank, 8 ... emergency valve, 9 …… Potentiometer, 10 …… Clutch, 11 …… Engine, 12 ……
Control unit, 13 …… link, 14 …… transmission,
21 …… Emergency piston, 22 …… Emergency cylinder.

Claims (1)

[Scope of utility model registration request] 1. A clutch for causing a clutch to be disengaged by a fluid pressure actuator that operates by a fluid pressure applied by switching a valve, and reducing the fluid pressure by switching a valve to perform a clutch connection operation by a clutch spring force. In the control device, the emergency actuator connected to the piston of the fluid pressure actuator, the emergency valve means provided on the side of the emergency actuator that operates the piston in the clutch disengagement direction, and the fluid pressure actuator are operated. A clutch control, comprising: a detection unit that detects a failure of the valve, and an operation unit that operates the emergency valve unit to disconnect the clutch when the detection unit detects a failure of the valve. apparatus.