JPS6238417Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle hydraulic system, and more particularly to a vehicle hydraulic system for controlling a clutch.

Recently, an increasing number of vehicles have an auto-clutch system in which the clutch is automatically operated without any operation by the driver. This type of device has an actuator operated by the negative pressure generated in the intake manifold, for example, and the actuator of this actuator is connected to the clutch. When operating the clutch, the negative pressure applied to the actuator is adjusted based on a command from the electronic control section, and the operating body of the actuator is moved to operate the clutch. As mentioned earlier, this type of device
Since the negative pressure generated in the intake manifold is used, the negative pressure fluctuates depending on the engine speed, which tends to make the operation of the entire system unstable. In order to improve these drawbacks, it becomes necessary to have a device that can determine the magnitude of the negative pressure from the engine speed and keep the negative pressure applied to the actuator constant at any time. This has the drawback that the entire device becomes complicated and large. In addition, there are other conventional devices that operate actuators using hydraulic pressure. This device uses a solenoid valve to adjust the flow rate of oil flowing into the actuator to adjust the operating speed of the actuator. The method of adjusting the flow rate of oil flowing into the actuator is to open and close an electromagnetic valve in a pulsed manner and change the duty of the pulse. In such conventional devices, the clutch stroke operates in steps, so when the clutch is operated, the clutch does not smoothly turn on and off, and the clutch vibrates finely, causing discomfort to the driver. Another drawback was that it shortened the life of the clutch.

The purpose of this invention is to provide a new vehicle hydraulic system in which a clutch actuator always operates smoothly in a hydraulically controlled autoclutch control system.

Next, one embodiment of this invention will be described in detail using the drawings.

FIG. 1 is a block diagram schematically showing the engine, clutch, and transmission of a vehicle. In the same figure,
1 is an engine, 2 is a clutch provided at the rear of the engine, and 3 is a clutch actuator for operating the clutch. The clutch actuator 3 has a clutch drive 4 and a clutch control 5. 6 is an electronic control device, 7 is a digital-analog converter, 8 is a hydraulic pump, 9 is an oil tank,
10 is an accumulator.

Next, the configurations of the clutch drive device 4 and clutch control device 5 of the clutch actuator 3 will be explained.

FIG. 2 is a block diagram showing details of the clutch actuator 3. The clutch drive device 4 constituting the clutch actuator 3 includes a cylinder 4a, a piston 4b, and an operating body 4c connected to the piston 4b.
The piston 4b is pressed in the clutch engagement direction by a compression spring 4d. The operating body 4c is connected to the clutch 2, and operates the clutch by moving it to the right or left. The clutch control device 5 includes electromagnetic valves 5a, 5
b, 5c. The electromagnetic valve 5a is a normally closed valve, that is, the valve opens when the electromagnetic coil is energized, and is always closed when the electromagnetic coil is not energized. The electromagnetic valve 5b is a normally open valve, that is, the valve is closed when the electromagnetic coil is energized, and is always open when the electromagnetic coil is not energized. The electromagnetic valve 5c is a three-port valve, and ports a, b, and c are always in communication. When the electromagnetic coil is energized, the plunger 5h is pulled upward, and the valve moves in a direction to close port c. The degree of opening of port c also changes as the amount of current applied to the electromagnetic coil changes. 5d is a relief valve, and 5g is a drive circuit that controls the amount of current flowing through the electromagnetic coil of the electromagnetic valve 5c.

Next, the general operation of the clutch actuator 3 will be explained.

The state shown in FIG. 2 is a state in which the engine is stopped, the electromagnetic valve 5a is closed, the electromagnetic valves 5b and 5c are both open, and the piston 4b is supported by the compression spring 4d.
The oil in the cylinder 4a is pushed to the left due to the spring force in the clutch, and the oil in the cylinder 4a returns to the oil tank 9.
Kuratsuchi is in a state of succession. Here, when the shift lever (not shown) is placed in the neutral position and the key switch is turned on, the electromagnetic valves 5a and 5b are energized and the former opens and the latter closes, so that the oil stored in the accumulator 10 is transferred to the relief valve 5d,
Since the piston 4b is quickly fed into the cylinder 4a via the electromagnetic valves 5a and 5c and the hydraulic pump 8 is also activated, the piston 4b moves rightward at a high speed and the clutch is disengaged. At this time, by operating the drive device 5g and adjusting the degree of opening of the port c of the electromagnetic valve 5c, the operating speed of the operating body 4c when the clutch is disengaged can be adjusted.
After that, when the engine starts, the shift lever (not shown) is placed in the drive D position or the reverse position R, the accelerator pedal (not shown) is depressed, and the accompanying idling switch is turned off.
The electromagnetic valve 5a is de-energized and closed, and the electromagnetic valve 5b is de-energized and opened, and the resistance value of the drive circuit 5g becomes a predetermined low resistance value according to a command from the electronic control device 6. Therefore, the plunger 5h of the electromagnetic valve 5c moves up by a predetermined stroke against the spring 5i, and the port c opens by a predetermined amount. Then, the piston 4b is pushed leftward by the force of the compression spring 4d, and the cylinder 4
Since the oil in a flows from port c to port b and returns to oil tank 9 through electromagnetic valve 5b, operating body 4c is also pushed to the left, causing clutch 2 to go from a half-clutch state to an engaged state. . When the clutch is completely engaged, the drive circuit 5g is turned off and the current to the electromagnetic valve 5c is cut off. Note that the moving speed of the operating body 4c can be adjusted in any manner by controlling the degree of opening of the port c of the electromagnetic valve 5c to adjust the amount of oil flowing out. When the clutch 2 is held in the engaged state, the electromagnetic valve 5a is de-energized and closed, and the electromagnetic valves 5b and 5 are closed.
It is sufficient to cut off the power supply to c and leave these in an open state.

To shift the clutch 2 from the engaged state to the disengaged state, the electromagnetic valves 5a and 5b are energized to open the former and close the latter, and the cylinder 4
If oil is sent into the piston 4b, the compression spring 4d
Then, the clutch is pushed to the right against the spring force within the clutch, and the clutch operating body 4c also moves to the right, so that the clutch 2 becomes in the disengaged state. When holding the clutch 2 in the disengaged state, the power to the electromagnetic valve 5c is cut off to open the port c, and the electromagnetic valve 5a is opened.
and 5b to open the former and close the latter. Note that the clutch drive device 4 as described above
Fig. 3 shows the operating state of the system.

The electronic control device 6 includes a read-only memory 6a that stores necessary data such as a sequence program for controlling engine operation and a clutch control pattern for a transmission described later, and read/write data that stores calculation results, input data, etc. memory 6
b, a control memory 6c that stores a control program, a processing device 6d that performs calculations and other data processing under the control of the control program and sequence program, and an input/output interface circuit 6e. In this invention, the electronic control device 6 controls the fuel supply amount,
In addition to controlling engine control parameters such as ignition timing and waste gas recirculation (EGR) according to operating conditions, it also controls the clutch. Therefore, detailed data for controlling the movement of the operating body 4c of the clutch drive device 4 as shown in FIG. 4 is stored in the read-only memory 6a. For example, when disengaging the clutch in order to change the gear ratio of the transmission, as shown in A in FIG.
Data for moving the operating body 4c at a speed of 180 mm/sec is stored. When the control lever of the transmission is in the first gear or reverse position and the clutch is switched from the disengaged position to the engaged position, the speed is 76 mm/sec in the clutch disengaged area, as shown in B in Figure 4. Data is stored in which the operating body 4c is moved at a slow speed of 2 mm/sec in the half-clutch region, and at a speed of 67 mm/sec in the clutch-engaged region. It is being When the control lever of the transmission is in the second gear position and the clutch is switched from the disengaged position to the engaged position, the operation lever is moved at a speed of 76 mm/sec in the clutch disengaged area, as shown in C in Figure 4. 4c, move the operating body 4c at a slow speed of 3mm/sec in the half-clutch region, and move the operating body 4c at a slow speed of 67mm/sec in the clutch-engaged region.
Data for moving the operating body 4c at a speed of sec is stored. When the transmission control lever is in the 3rd gear position and the clutch is to be switched from the disengaged position to the engaged position, the 4th gear
As shown in d in the figure, the operating body 4c is moved at a speed of 76 mm/sec in the clutch disengaged region, and at a slower speed of 6 mm/sec in the half-clutch region.
The operating body 4c is moved at a speed of 67 mm/sec in the clutch contact area.
Contains data for moving c.
When the control lever of the transmission is in the 4th gear position and the clutch is switched from the disengaged position to the engaged position, as shown in Fig. /sec
Data for moving the operating body 4c at a speed of . When the control lever of the transmission is in the 5th gear position and the clutch is switched from the disengaged position to the engaged position, the control lever 4c moves 90 mm / Data for moving the operating body 4c at a speed of sec is stored.

Next, the operation of the automatic clutch device including the clutch actuator according to this invention will be explained.

The driver starts the engine of a parked car,
When attempting to start the vehicle forward, first move the shift lever to neutral position N and turn on the key switch. The clutch actuator 3 is read out from the clutch disconnection data.
A clutch disengagement signal is sent to the That is, when a signal is output that energizes the electromagnetic valves 5a and 5b of the clutch control device 5 to open the former, close the rear wheel, and move the operating body 4c at the speed shown in FIG. 4A. , this signal is converted into an analog value by the digital-to-analog converter 7, and is applied to the drive circuit 5g that drives the electromagnetic valve 5c.
Therefore, an analog voltage is applied to the electromagnetic coil of the electromagnetic valve 5c so that the operating body 4c moves at an operating speed of 180 mm/sec, as shown in FIG. 4A. Then, the port c of the electromagnetic valve opens by a predetermined amount, and the operating body 4c moves at a predetermined speed from the engaged position to the disengaged position, thereby bringing the clutch into the disengaged state. After the clutch is disengaged, the transmission control lever operates according to a command from the electronic control unit 6, and the transmission shifts to the first position.
Can be switched to gear. When this switching operation is completed and the driver presses the accelerator pedal to turn off the idling switch, data as shown in FIG. /sec
is driven at a speed of The moving position of the operating body 4c is determined moment by moment by the electronic control device 6 using a well-known position sensor.
The movement position is read into this. When the operating body 4c enters the half-clutch region in FIG. 4, the moving speed of the operating body 4c is 2 mm/sec.
It is made slowly. When the operating body 4c exits the half-clutch area and enters the clutch contact area, the operating body 4c again receives a command from the electronic control unit 6 at a speed of 67 mm/sec.
The operating body 4c moves at such a speed that the clutch switching is completely completed. After this, change the transmission from 2nd gear to 3rd gear, from 3rd gear to 4th gear, and from 4th gear to 5th gear.
The same clutch switching operation as described above is also performed when changing to a higher speed.

It goes without saying that the clutch operating device according to this invention can be applied not only to gasoline engines but also to diesel engines.

As explained in detail above, this invention uses a valve member that can continuously change the amount of oil to control the amount of oil transferred to the hydraulic cylinder that controls the clutch of the vehicle. Control is much smoother than with conventional control devices, improving both driving sensation and ride comfort.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram showing one embodiment of this invention, Fig. 2 is a block diagram showing details of the clutch actuator, Fig. 3 is an explanatory diagram explaining the operation of the clutch control device, and Fig. 4 FIG. 2 is a characteristic diagram showing moving speed data of an operating body. 1... Engine, 2... Clutch, 3... Clutch actuator, 4... Clutch drive device, 4
a... Cylinder, 4b... Piston, 4c... Operating body, 5... Clutch control device, 5a to 5c...
...Solenoid valve, 6...Electronic control device, 7...Digital-analog converter.

Claims (1)

[Scope of utility model registration request] In a vehicle hydraulic system that has a cylinder that is driven by hydraulic pressure and has a piston that operates a clutch, and an electromagnetic valve member that controls hydraulic pressure to the rear cylinder, the valve opening degree is continuously adjusted in proportion to the amount of energization. A solenoid valve member that is freely adjustable and is provided at the hydraulic pressure supply port of the cylinder, a drive circuit that controls the amount of energization to the solenoid valve member, and an amount of energization to the solenoid valve member by giving a command to the drive circuit. 1. A hydraulic system for a vehicle, comprising: adjusting means for adjusting the clutch so as to operate the clutch at a desired operating speed moment by moment.