JPH0587712B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Field of Application) The present invention relates to a shift actuator control device, and more particularly to a shift actuator control device that detects gear disengagement and shifts into gear when a gear disengagement occurs. (Prior art) A parallel shaft gear type transmission and a dry veneer clutch are used, and an actuator that is controlled by a computer operates the transmission and the dry veneer clutch as if they were controlled by a human. A control system has been developed and put into practical use. In this system, the parallel shaft gear type transmission is controlled by a hydraulic shift actuator that changes gears in the shift direction, and a hydraulic select actuator that changes gears in the select direction. , a computer determines the optimal gear position from the amount of depression of the accelerator pedal and the vehicle speed, and drives the shift actuator and select actuator to execute a gear change. In this type of shift transmission system, shift points (including neutral) in the gear shift direction are detected only by a position switch that detects a select position. (Problem to be Solved by the Invention) Therefore, when performing a shift operation from the neutral point to the low (LOW) or R (REVERSE) position, for example, when the shift actuator rotates the shift fork shaft, the neutral position The shift switch is immediately turned off, and when the shift actuator rotates the shift fork shaft to change the gear to the low or reverse position, the low or reverse position switch is turned on. Therefore, it is impossible to detect the position from the neutral point to the shift completion point. For this reason, even if a gear slippage problem occurs while the vehicle is running, the position switch signal simply disappears, making it unclear to what extent the gear slippage has occurred. This caused the engine to rev up, making smooth operation impossible and potentially leading to an accident. SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a shift actuator control device that can quickly detect gear slippage and, when gear slippage occurs, re-enter the gear. (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a transmission that changes the number of revolutions of an engine, and an engine that is interposed between the engine and the transmission and transmits the speed to the transmission. a clutch that turns on and off the rotational force of the engine, an electronic control device that calculates the shift position of the transmission from the amount of depression of the accelerator pedal and the engine speed, and a clutch that operates the transmission based on commands from the electronic control device. A shift actuator control device including a driving actuator and a clutch actuator,
A shift stroke sensor connected to a shift actuator of the transmission to detect the operating position of the shift actuator, and a comparison means for comparing a drive command value of the shift actuator of the transmission with a detection value of the shift stroke sensor. Then, when it is detected that a predetermined difference has occurred in the comparison value of the comparison means at the end of driving the shift actuator, and the value is larger than the set value, a command is issued to turn off the clutch and drive again, and the comparison is made. A shift actuator control device is provided, comprising: command means for issuing a command to re-drive the shift actuator when the value is smaller than a set value. (Function) When changing gears, if the amount of gear disengagement is large depending on the shift stroke position, or if the rate of change in engine speed is large, that is, when large torque is generated in the gear, disengage the clutch. , turn on one of the solenoid valves, engage the gear, and perform the operation. Furthermore, when the amount of gear disengagement is small and the torque is small, one of the solenoid valves is turned on without disengaging the clutch, and the gear is forcibly shifted. (Example) Next, an example of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embodiment of a transmission actuator using the shift actuator control device of the present invention, and FIG. 2 is a flowchart of gear shift control. First, an embodiment of a transmission actuator using the shift actuator of the present invention will be described with reference to FIG. 1 and Table 1. However, although the embodiment of FIG. 1 includes emergency control, the present invention is not specifically limited to including emergency control. In Fig. 1, TM is a well-known parallel shaft gear type transmission, and 1 indicates a shift actuator of the transmission TM, which is connected to a shift rod of the transmission TM in a cylinder 1a. The piston P11 provided on the piston rod 1b and the piston rod 1
A piston 12 that is loosely fitted to the end of b is built in. In this shift actuator 1, as shown in FIG. 1, when hydraulic pressure is applied to the upper hydraulic chamber, the hydraulic pressure acts on the piston P11 and the piston rod 1
b is moved downward and the shift fork shaft of the transmission TM is rotated to switch the transmission TM to reverse or the second forward stage 2, the fourth forward stage 4, or the sixth forward stage 6. In addition, in FIG. 1, when hydraulic pressure is applied to the lower hydraulic chamber, the hydraulic pressure acts on the piston P12 and the extended end of the piston rod 1b, and finally moves the piston rod 1b to the upper end in FIG. The transmission TM is switched to the first forward stage L, the third forward stage 3 or the fifth forward stage 5 by rotating the shift fork shaft of the transmission TM. In FIG. 1, when hydraulic pressure is applied to the lower and upper hydraulic chambers, the hydraulic pressure simultaneously acts on the pistons P11, P12 and the extended ends of the piston rod 1b, and the piston rod 1b is moved to the position shown in FIG. 1 (intermediate position). ) and TransmissionTM
in the neutral position. 2 indicates a selection actuator. The select actuator 2
There is a transmission in cylinder 2a.
A piston P21 provided on a piston rod 2b connected to the TM selection rod and a piston P22 loosely fitted into the end of the piston rod 2b.
is built in, and another piston P23 is provided at the left end of the cylinder 2a, and the cylinder 2a
Hydraulic chambers 2c, 2d, and 2e are formed therein. When applying hydraulic pressure to the three hydraulic chambers of the select actuator 2 as described later, the piston rod 2b can take four positions. At this time,
The transmission TM is neutral N ₁ , N ₂ ,
It will be placed at either position N ₃ or N ₄ . 3 indicates a shift stroke sensor consisting of a variable resistor, for example, and the shift actuator 1
The position of the piston rod 1b is detected over the entire stroke, and a position signal TMS of the piston rod 1b that changes every moment is output. S ₁ to _{S 4} are switches for detecting each of the aforementioned select positions of the select actuator 2, and one of the switches S ₁ to _{S 4} is turned on according to each select position, and the select position is activated. This outputs a signal TMC. V ₁ , V ₂ are solenoid valves that operate the shift actuator 1, and V ₃ , V ₄ , V ₅
is a solenoid valve that operates the selection actuator 2. Pin is the main hydraulic power source, P is the hydraulic power source for the normal hydraulic circuit system, and P' is the hydraulic power source for the emergency hydraulic circuit system. Note that the present invention includes not only hydraulic pressure but also pneumatic pressure.
Ve ₁ is an emergency solenoid valve for the selector actuator 1, Ve ₂ and Ve ₃ are emergency solenoid valves for the shift actuator, and Ve ₄ is a solenoid valve for switching the hydraulic circuit system. . Reference numeral 4 denotes a dry single plate clutch, through which the input side of the transmission TM is connected to the output shaft of an engine (not shown). Clutch 4 release hawk 4
a is connected to the clutch actuator 5.
The clutch actuator 5 has a piston 5b moving in a cylinder 5a, and the piston 5b
is connected to the release fork 4a of the clutch 4 as described above, and the piston 2b is further connected to a clutch stroke sensor 6 consisting of, for example, a variable resistor. The clutch actuator 5 is connected to electromagnetic valves V ₆ , V ₇ , and V ₈ for operating the clutch actuator 5 . The solenoid valve _V8 has a smaller port diameter than the solenoid valve _V7 . When solenoid valve V ₆ is opened with solenoid valves V ₇ and V ₈ closed, hydraulic pressure is applied to hydraulic chamber 5c of clutch actuator 5, and piston 5b moves rightward in FIG. is prohibited. When the solenoid valve V ₈ with a small port diameter or _the solenoid valve V ₇ is opened simultaneously or separately with the solenoid valve V 6 closed, the oil pressure in the hydraulic chamber 5c decreases and the oil filled therein decreases. is pulled out in the direction of the tank T, so the piston 5b moves to the left by the spring force of the clutch 4, and the clutch 4 changes from the disengaged state to the engaged state. The operating speed of the clutch 4 from disengagement to engagement can be adjusted by adjusting the degree of oil drainage by adjusting the degree of opening of the solenoid valves V ₇ and V ₈ . The operating position of the clutch actuator 5, ie, the position of the clutch 4, is detected by a clutch stroke sensor 6, and the position signal is output as "CLUS". 7 is a control device configured with a microcomputer. The control device 7 receives not only detection signals obtained from various parts of the vehicle but also commands issued by the driver or the like. In the present invention, in particular, the clutch stroke position signal "CLUS" emitted from the clutch stroke sensor 6, the engine rotation speed signal "ENGN" (detector not shown),
A position signal "TMS" indicating the shift stroke from the shift stroke sensor 3 and a select position signal "TMC" from the switches S ₁ to _{S 4} are input. The control device 7 is configured to issue output signals to predetermined parts for controlling each part of the vehicle according to a program stored in advance in the memory MEM according to input commands and detection signals. The central processing unit CPU is used for execution. The control device 7 calculates the rate of change in engine rotation speed per unit time (dN/dt) from the input engine rotation speed signal "ENGN" to obtain a signal "ENGDN". In the present invention, although not shown in the figure, the control device 7 uses the accelerator pedal depression amount signal and the engine rotation speed "ENGN" to control the transmission.
The optimum gear change stage of the TM is calculated, a command signal is issued to each electromagnetic valve to operate them, and the shift actuator 1 and select actuator 2 are driven, as well as the clutch actuator 5 is driven. to switch the transmission TM to the optimal gear. In the present invention, as described above, the shift actuator 1 of the transmission TM is provided with the shift stroke sensor 3 to continuously detect the shift stroke and constantly monitor the gear position. If a gear slips out while a large torque is being generated in the transmission TM gear, the clutch 4 is temporarily disengaged and the gear is re-engaged. Additionally, if a gear slips out when the TransmissionTM gear is not generating a large amount of torque, it will automatically re-engage the gear without disengaging the clutch. Furthermore, if gear slippage occurs within a short period of time and the amount of gear slippage is greater than a predetermined value, the clutch 4 is temporarily disengaged and the gear is re-engaged. Next, Table 1 shows the relationship between the operating state and gear position of the normal solenoid valves V ₁ , V ₂ , V ₃ , V ₄ , V ₅ and the emergency solenoid valves Ve ₁ , Ve ₂ , Ve ₃ , Ve ₄ . show.

[Table] As is clear from Table 1, emergency solenoid valves are used when normal solenoid valves fail. For example, the "R" gear position is determined by the solenoid valves Ve ₂ , Ve ₁ ,
Ve ₄ is obtained by turning on, and the “L” gear position is:
_The neutral position is obtained by turning on _{the solenoid valves Ve 3 ,} Ve ₁ and _{Ve 4 .} Next, the operation of the present invention will be explained using the flowchart shown in FIG. First, the clutch stroke position signal “CLUS”, engine speed signal “ENGN”, engine speed change rate “ENGDN”, and shift stroke position signal “TMS” are read (step S1,
S2, S3, S4). Based on the clutch stroke position read in step S1, it is determined whether the clutch is fully engaged or not (step S5). That is, when the clutch is moving from disengagement to engagement or from engagement to disengagement, step 5 is executed.
At this point, the routine of the present invention is exited. If clutch 4 is fully engaged, the flow transitions to "YES". Then step
At S5', the control device 7 determines the value of the acquired shift stroke signal "TMS", and determines whether this value completely matches the gear-on completion position of the transmission TM, or whether there is a difference from the completion position. ,
That is, if the amount of gear slippage is extremely small, within about 0.5 mm, it is determined that gear slippage of the transmission TM has not occurred, and the routine of the present invention is exited. If the amount of gear dislodgement becomes large, step S6
The gear dropout amount is the transmission
For example, when the main gear and clutch gear of the TM are on the verge of disengagement, or when the rate of change in engine speed suddenly increases and exceeds a predetermined value, the process moves to step S8. In addition, as mentioned above, even when the amount of gear slippage is not so large and gear slippage does not occur suddenly, when the engine speed change rate "ENGDN" is not almost zero, that is, when the accelerator pedal is depressed to accelerate When a load is applied to the gear meshing part of the transmission, or when an attempt is made to decelerate by loosening the pressure on the accelerator pedal, and a load is applied to the transmission gear due to rotation from the wheel direction, the flow is changed in step S7. The process moves to step S8. In step S8, a command to disengage the clutch is issued, a command is issued from the electronic control device 7 to the solenoid valve _V6 , hydraulic pressure is applied to the hydraulic chamber 5c of the clutch actuator 5, and the clutch 4 is disengaged. (Step S9). Turn on solenoid valve V ₁ or V ₂ and control device 7
monitors the value of the shift stroke sensor 3, and maintains this on state until the shift operation is completed (steps S10, S11). When the shift operation is completed, issue a clutch engagement command to engage the clutch and step
Turn off the solenoid valve V ₁ or V ₂ that was turned on in S10. On the other hand, in step S7, if the value of the engine speed change rate "ENGDN" is almost 0, it is determined that the transmission TM gear is not under much load, and the clutch is not disengaged. The solenoid valve _V1 or _V2 is turned on, and the control device 7 monitors the value of the shift stroke sensor 3, and maintains this on state until the gear shift operation is completed (steps S14, S15). When the shift operation is completed, solenoid valve _V1 or _V2 is turned off (step S16). In the above embodiment, the value of the shift stroke sensor 3 that determines that gear slippage has occurred is treated as the same value for each gear, but this can be changed to take the optimum value for each gear. You may also perform processing. (Effects of the Invention) As explained above, the present invention detects gear slippage by providing a shift stroke sensor, and can immediately perform the gear shifting operation. Inconveniences such as neutral driving and engine revving have disappeared. When the amount of gear slippage is large,
Or when the engine speed change rate is not nearly zero, that is, when the torque applied to the gear is large,
To enable safe driving by disengaging the clutch and re-engaging the gear, and when the amount of gear disengagement is small and the torque applied to the gear is large, the gear can be re-engaged without disengaging the clutch.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of a transmission actuator using the shift actuator control device of the present invention, and FIG. 2 is a flowchart of gear disengagement control. 1...Shift actuator, 2...Select actuator, _V1 , _V2 , V3, _V4 , _{V5 ,} Ve1, _{Ve2 ,
Ve3} , _Ve4 ...Solenoid valve, 3...Shift stroke sensor, _S1 , _S2 , _S3 , _S4 ...Position sensor, 4...Clutch, 5...Clutch actuator, 7...Control device.

Claims (1)

[Claims] 1. A transmission that changes the engine speed, a clutch that is interposed between the engine and the transmission and turns on/off the engine rotational power that is transmitted to the transmission, and a clutch that changes the speed of the engine based on the amount of depression of the accelerator pedal and the engine speed. A shift actuator control device comprising: an electronic control device that calculates a shift position; an actuator and a clutch actuator that drive a transmission according to commands from the electronic control device;
A shift stroke sensor connected to a shift actuator of the transmission to detect the operating position of the shift actuator, and a comparison means for comparing a drive command value of the shift actuator of the transmission with a detection value of the shift stroke sensor. Then, when it is detected that a predetermined difference has occurred in the comparison value of the comparison means at the end of driving the shift actuator, and the value is larger than the set value, a command is issued to turn off the clutch and drive again, and the comparison is made. A shift actuator control device comprising: command means for issuing a command to drive the shift actuator again when the value is smaller than a set value.