JPH03113164A - Control by transmission controller - Google Patents

Abstract

PURPOSE:To improve reliability of a transmission controller by setting the gear selection position at a proper position by increasing or reducing the gear selection position of a selecting actuator little by little from a set position when the gear change disorder is judged. CONSTITUTION:A control unit 4 drives a selecting actuator 2a and shift actuator 2b and carries out the speed change of a transmission 1. In this case, if the position of the shift actuator 2b which is detected by a potentiometer 2g is outside a synchromesh mechanism range and the operation speed which is detected by a detecting means 4a from the potentionmeters 2f and 2g exceeds a standard speed for a prescribed time or more, a judging means 4b judges the gear change disorder. Then, the gear selection position of the selection actuator 2a is increased or reduced little by little from a set position, and the selection position is set properly. Thus, the gear change disorder due to the deflection of the stop position of the actuator is eliminated, and the succeeding generation of the disorder is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to gear switching of a transmission control device that is equipped with a shift actuator and a select actuator and automatically controls a transmission and a clutch based on the amount of depression of an accelerator pedal, vehicle speed, etc. The present invention relates to a control method in the event of a failure.

[Prior Art] FIG. 3 is a simplified configuration diagram showing an example of a conventional transmission control device. In the figure, 1 is a well-known parallel shaft gear type transmission, which is composed of a select actuator 2a and a shift actuator 2b. The gear change is controlled by the actuator section 2. As shown in FIG. 4, this transmission 1 is equipped with a synchromesh mechanism 1e consisting of a synchronizer hub 1f and a cone clutch 1c to prevent gear noise during gear changes. A synchronizer hub 1f of a freely movable sleeve 1d is pressed against a cone clutch 1c of a gear 1b, thereby synchronously connecting the shaft 1a and the gear 1b. Each of the actuators 2a, 2b includes a tank 3a,
Hydraulic drive system 3 consisting of pump 3b and accumulator 3c
The piston rod 2c is driven by the hydraulic pressure of the piston rod 2c.

2d controls the drive gear of the transmission 1. This control is performed under the control of a drive unit (hereinafter abbreviated as D/U) 2e, and this D/U 2
e is controlled by the main control unit 4. 2f and 2g are potentiometers as position detection means for detecting the positions of the piston rods 2c and 2d, and D/U is controlled so that the actual position signals of the potentiometers 2f and 2g match the target position signal M from the main control unit 4. 2. As shown in the schematic diagram in FIG. 5 (al), the gear position is controlled by feedback control by
from the neutral position of td N Fj to each gear position, that is, the first gear position of it 1 n, tt
2 is switched to the 2nd gear position of rt, the 3rd gear position of u 3 pt, the 4th gear position of at 4 +y, the 5th gear position of It 51F, and the reverse gear position of (I RII. 6 is the clutch actuator 7 The clutch actuator 7 is connected and disconnected in conjunction with the piston rod 7a.The clutch actuator 7 is supplied with hydraulic pressure from the hydraulic drive system 3, and the actual position signal of the piston rod 7a detected by the potentiometer 7c is the main signal. Feedback control is performed by the D/U 7b so as to match the target position signal C from the control unit 4. The D/U 7b is controlled by the main control unit 4. 8 is an engine, which is controlled by the main control unit 4. The rotation of the engine 8 is transmitted to the axle 10 via the clutch 6 and the transmission 1.The main control unit 4 includes an accelerator pedal detector 11.
, the brake pedal detector 12, the key switch 13, the exhaust brake switch 14, the selector 15, etc.
7 and the like. Therefore, the main control unit 4 controls the clutch 6 and the transmission 1 according to the amount of depression of the accelerator pedal, the vehicle speed, the switching position of the selector 15, and the like. Note that "D4" of the selector 15 is for 1st to 4th speeds, ((p
, jl is an automatic shift mode from 2nd speed to 5th speed. To change gears, as schematically shown in FIG. put in. At this time, the dog clutch 1d is slid on the shaft 1a by the actuators 2a and 2b and meshed with the gear 1b, and the gear 1b is engaged with the shaft 1b.
By connecting with a, driving force is transmitted via other gears and shafts.

However, as shown in FIG. 5('b), the shift lever 50
be caught between the shift blocks 52 and 53, or due to malfunction of the actuator itself, the actuator 2a,
2b will not move and a gear change failure will occur. As a method for detecting this gear change failure,
-11759, JP 60-222328, JP 62-278342, JP 62-27
Some of them are described in Japanese Patent Application Laid-open No. 8343 and Japanese Patent Application Laid-Open No. 62-288755. However, in all of the above publications, gear change defects are detected based on the elapsed time from the start of the gear change operation, so it is difficult to detect the condition of the defect, for example, the position where each actuator 2a, 2b malfunctions. Unable to take appropriate action.

Therefore, as described in JP-A No. 62-288756, the operating speed of the actuator is detected, and when the operating speed continues to decrease for a predetermined period of time, it is determined that the actuator is malfunctioning and the actuator is moved to the target position. stop the operation,
Some devices are designed to then operate to the target position again.

[Problems to be Solved by the Invention] Since the conventional transmission control device is configured as described above, the transmission 1 is usually provided with the synchromesh mechanism 1e, and the actuator in the synchromesh mechanism range 1 is The operating speed of the gearbox 2b inevitably decreases due to friction between the synchronizer ring and the gears when they mesh with each other, and this reduction in speed is often interpreted as a malfunction. Also,
The actuator used in each of the above publications is a three-position cylinder, and the piston rod can only be stopped at a predetermined position. In other words, when the actuator malfunctions due to temporary locking, the actuator is returned to the neutral position and then restarted to perform gear switching, thereby eliminating the gear switching malfunction. No consideration is given to the deviation of the Particularly in the case of the select actuator, if the stop position shifts due to errors or changes over time during assembly, the shift lever 50 may get caught between the shift blocks 51 to 53, and at this time the select actuator 2a may stop. It is not possible to reset the position to the proper position, and control alone cannot prevent the gear switching failure from occurring again, resulting in problems such as the need for reassembly and adjustment.

This invention was made to solve the above-mentioned problems, and it detects the speed of the actuator and determines whether the actuator is malfunctioning at a position other than the synchronized mesh mechanism during gear change. A control method for a highly reliable transmission control device that prevents a decrease in the speed of an actuator caused by a mechanism from being judged as malfunction, corrects the stop position of the actuator to an appropriate position, and prevents recurrence of gear switching failures. The purpose is to obtain.

[Means for Solving the Problems] A control method for a transmission control device according to the present invention includes a position detecting means for detecting the position of a piston rod, and based on a signal from the position detecting means, the piston rod is moved to each position of the transmission. An actuator unit includes a shift actuator and a select actuator, each of which is a servo cylinder that can be positioned at any position in the gear position, and detects the operating speed of the piston rod of the shift actuator based on a signal from the position detection means of the shift actuator. When the operating speed continues to be lower than the reference speed at a position outside the synchromesh mechanism range of the transmission based on a signal from the speed detection means and the shift actuator during a gear shift operation. and a control unit having a determination means for determining that the gear switching is defective, and when the shift actuator is determined to be defective in gear switching by the determination means, the position of the piston rod is at a relatively shallow position of the gear shifting operation. After slightly increasing and decreasing the gear select position of the select actuator from the set position, the shift actuator is driven to perform a gear shift operation, and the piston rod is positioned at a relatively deep position for the gear shift operation. In this case, the shift actuator is driven to perform a gear removal operation and return to the neutral position, and then the gear insertion operation is performed again.

[Operation] The control method for the transmission control device according to the present invention includes detecting the actuating speed of the actuator from the position detecting means and detecting the gear change position of the shift actuator, and determining whether the position of the actuator is outside the range of the synchromesh mechanism. , the determination means determines that there is a gear switching failure due to malfunction of the actuator only when the operating speed of the actuator decreases below the reference speed for a predetermined period of time, and the position of the piston rod of the shift actuator at the time of this gear switching failure is determined to be in gear. When the operation is at a relatively shallow position, the gear select position of the select actuator is slightly increased and decreased from the set position, and then the shift actuator is driven to perform a gear shift operation, and the position of the piston rod is adjusted to the gear position. When the shift actuator is in a relatively deep position, the shift actuator is driven to perform a gear disengaging operation to return to the neutral position, and then the gear shifting operation is performed again.

[Embodiment] Figs. 1 and 2 are a partially simplified configuration diagram showing an embodiment of a transmission control device according to the present invention, and a flow chart explaining a control method, and are different from the conventional example shown in Figs. The same parts are given the same reference numerals and their explanations are omitted.

In the figure, a shift actuator 2a and a select actuator 2b of the actuator section 2 are composed of servo cylinders that can stop piston rods 2c and 2d at arbitrary positions,
The hydraulic switching solenoid valves 31a to 32c are mechanically connected to the hydraulic drive system 3 and control the hydraulic pressure from the hydraulic drive system 3 to stop the piston rods 2c and 2d at arbitrary positions.

The hydraulic switching solenoid valves 31a to 32c are first solenoid valves 31a and 32a which are normally open two-way valves that guide hydraulic pressure from the hydraulic drive system 3, and normally open two-way valves that operate the piston rods 2c and 2d. Second solenoid valves 31b, 32b and third solenoid valve 31c.

32c. The main control unit 4 includes each actuator 2a.

2b, a speed detection means 4a for detecting the operating speed from the potentiometers 2f and 2g, and the shift actuator 2.
When the position of the piston rod 2d during gear change is outside the range of the synchronized mesh mechanism according to the position signal from the potentiometer 2g of b, and the operating speed from the speed detection means 4a continues to be lower than the reference speed for a predetermined period of time, the gear is changed. Determination means 4b for determining that the change is defective
It is equipped with

Next, the operation will be explained. The main control unit 4 calculates the target gear position based on the output signals from each detector based on the flowcharts in FIGS. 2(al) and (b),
When the target gear position differs from the current gear position, a gear change request flag is set, a target position signal M is output, and D/D is set to match the target position signal M.
U2e drives each actuator 2a, 2b to change gears.

To change gears, the shift actuator 2b drives the shift lever 50 to remove the current gear (shift out), the select actuator 2a positions the shift lever 50 at the select position, and the shift actuator 2b moves the shift lever 50 to the select position. 51-5
3 to shift into gear. Next, FIG. 2(C).

According to the flowchart of fdl, the operating speed of the shift actuator 2b during the gear shifting operation in gear change is detected by the speed detection means 4a from the amount of change in the shift stroke, and it is determined that the operating speed of the actuator 2b is lower than the reference speed for a predetermined period of time. If this continues, the determining means 4b determines that the gear change is defective, and sets a shift-in speed reduction flag. Next, when the gear change is determined to be defective, it is determined from the position signal of the potentiometer 2g of the shift actuator 2b whether or not the current position of the piston rod 2d of the shift actuator 2b is within the synchromesh mechanism range, If it is within the range of the synchronized mesh mechanism, continue to perform one normal gear change. In addition, if it is outside the synchronized mesh mechanism range, it is determined from the above position signal whether the shift-in operation is at a deep position or a shallow position, and if it is a deep position, the shift actuator 2b is shifted out and shifted to the neutral position. and shift in again. Next, when the position is shallow,
Switching solenoid valves 32a to 32 of shift actuator 2b
c is turned off, the hydraulic pressure applied to the piston rod 2c is set to 0, and the operating force of the shift actuator 2b is set to 0. Next, it is determined whether the select position has deviated from the target position signal M, and if the select position has deviated, the select actuator 2a is positioned again to match the target position signal M, and then a shift-in is performed. Further, if there is no deviation, a predetermined correction is applied and then shift-in is performed. In this embodiment, the gear change failure at the shallow position of the shift-in operation is not just a malfunction of the actuator, but also a failure of the change lever as shown in Fig. 5 (bl).
50 may be caught between the gear boxes 51 to 53.

The correction method for the select actuator 2a in this case is as follows:
As shown in FIG. 1, the hydraulic drive system 3 is restarted to return the position of the select actuator 2a to the target position F, and the target position signal M is set so that the target position F is shifted in the Fa force direction and the Fb force direction. The selection position is shifted and corrected by gradually increasing the predetermined correction amount ±α, and is shifted in each time. That is,
First, correct the select position by α in the Fa force direction (+α) and position it, then shift in. If the gear is not engaged, correct the position by α in the Fb force direction (−α) and position, then shift in again. . If the gear does not engage with this, move further ±α from the corrected select position as above.
Each of the above flowcharts, in which the gear is positioned at the corrected position and shifted in, and the above operations are repeated until the gear shift is completed or the shift-in operation reaches a deep position, is repeatedly activated at predetermined time intervals.

As described above, the control method of the transmission control device of this embodiment detects the gear change position of the shift actuator 2b, and when the position of the actuator 2b is outside the synchronized mesh mechanism range, the operating speed of the actuator 2b is increased. The determining means 4b determines that the gear switching is defective due to malfunction of the actuator 2b only when a predetermined period of time has elapsed since the speed decreases from the reference speed, and the gear select position is corrected based on the determination result of the determining means 4b. It is possible to prevent a decrease in the speed of the actuator 2b in the synchromesh mechanism from being determined as a malfunction, thereby increasing the reliability of the device. Also,
When the shift actuator 2b is determined to be defective in gear switching by the determining means 4b, the gear select position of the select actuator 2a is slightly increased and decreased from the set position, so that the select position can be set to an appropriate position, and the actuator It becomes easy to eliminate gear switching failures due to deviations in stop positions and prevent recurrence, and the reliability of the device can be further improved.

[Effects of the Invention] As described above, according to the control method of the transmission control device of the present invention, when the shift actuator is located outside the synchromesh mechanism range and the operating speed becomes lower than the reference speed for a predetermined period of time, Since the gear switching is determined to be defective, a decrease in the speed of the actuator in the synchromesh mechanism is not judged as a malfunction.
Since it is possible to reliably detect a gear switching failure, the reliability of the device can be increased. Also, when the shift actuator is determined to have a gear switching failure by the determination means, the gear select position of the select actuator can be slightly increased or decreased from the set position. Since it is possible to set the select position to the appropriate position, there is no need for reassembly or adjustment, and it is easy to eliminate gear switching failures due to deviations in the stop position of the actuator and prevent recurrence, further increasing the reliability of the device. .

[Brief explanation of drawings]

FIG. 1 is a partially simplified configuration diagram showing an embodiment of a transmission control device according to the present invention, FIG. 2 is a flowchart explaining a control method of the transmission control device of the present invention, and FIGS. 3 to 5 are diagrams showing a conventional transmission. FIG. 1 is a simplified configuration diagram showing an example of a control device and a schematic diagram showing main parts thereof. DESCRIPTION OF SYMBOLS 1... Transmission, 1e... Synchromesh mechanism, 2... Actuator part, 2a... Select actuator, 2b... Shift actuator, 2f, 2g... Potentiometer, 2e, 7b...
- Drive unit, 3... Hydraulic drive system, 4... Main control unit, 4a... Speed detection means,
4b... Judgment means, 6... Clutch, 7... Clutch actuator, 8... Engine, 15... Selector. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] An actuator section consisting of a shift actuator that changes gears in the shift direction of a transmission having a synchromesh mechanism in each gear, and a select actuator that changes gears in the select direction; A target position signal is calculated from the vehicle speed and the set position of the selector that selects the gear, and the actuator section is controlled to set the gear within the target range, and to connect and disconnect according to the operation of the transmission. and a control unit for controlling a clutch, the shift actuator and select actuator having position detection means for detecting the position of the piston rod, and based on a signal from the position detection means, the piston rod is shifted to each shift of the transmission. The control unit includes a servo cylinder that can be positioned at any position in the shift actuator, and the control unit includes a speed detection means for detecting the moving speed of the piston rod of the shift actuator based on a signal from the position detection means of the shift actuator; determining means for determining that a gear changeover is defective when the moving speed at a position outside the synchromesh mechanism range of the transmission continues to be lower than a reference speed for a predetermined period of time based on a signal from the speed detecting means during a gear shifting operation; When the shift actuator is determined to be defective in gear switching by the determination means, the gear select position of the select actuator is slightly increased from the set position when the piston rod is at a relatively shallow position for gear shifting operation. After decreasing the amount, the shift actuator is driven to perform a gear engagement operation, and when the piston rod is at a relatively deep position for the gear engagement operation, the shift actuator is driven to perform a gear release operation. A control method for a transmission control device, which comprises returning the transmission to a neutral position and then performing a gear shift operation again.