JPH0356652Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control unit that performs gear change control, a clutch operation means that engages and engages the clutch, a shift operation means that shifts a transmission, and an engine that controls engine rotation. The present invention relates to an improvement in an automatic transmission for a vehicle equipped with a rotation control means and a clutch disengagement detection means for detecting engagement and disengagement of a clutch.

[Conventional technology] Of the mechanical automatic systems that achieve both easy driving and fuel efficiency, only the clutch operation at the time of starting is left manual, and after driving, the driver specifies the target gear using the selector lever, or the automatic range is used. There is a semi-automatic system that automatically performs all operations as the vehicle speed increases if you specify
−70610).

Figure 1 is the overall configuration diagram, Figure 2 is a detailed diagram of the main parts,
FIG. 3 shows a control block diagram, and these drawings are drawings showing embodiments of the present invention. Among them, known parts will be explained in order to better understand the invention of the present application.

In the figure, a non-synchronized transmission 30 is attached to an engine 10 via a mechanical clutch 20, and its output shaft is connected to a propeller shaft 31.
It is connected to a rear axle (not shown) via.

The engine 10 is provided with an accelerator opening sensor 12 for detecting the position of the fuel injection pump 11, which is an engine rotation control means.

The clutch 20 includes an OFF detection switch 21a and an ON detection switch 21b, which are clutch discontinuation detection means for detecting clutch disengagement, and a clutch actuator 22, which is a clutch operation means for connecting and disengaging the clutch. A clutch valve 23 for selectively supplying air is provided. Note that 24 is a check valve.

The transmission 30 includes a countershaft rotation sensor 32 that detects the rotational speed of the main gear, and a vehicle speed sensor 3 that detects the rotational speed of the main shaft.
3, a shift position sensor 34 that detects the shift position of the transmission, and a shift change actuator 35 that is a shift operation means that shifts the transmission.
is provided.

On the other hand, a selector 13 provided in a driver's cab (not shown) uses a selector lever 13a to reverse R, 1
Six ranges from speed to 6th speed and neutral N can be specified, and there is a switch inside that corresponds to each range. 14 is an auto button that specifies auto range, and when this button 14 is turned on,
By specifying a specific speed (for example, 5th speed) with the selector 13, it is possible to switch to auto range. 15 is a shift position display lamp, 16 is an accelerator pedal, and 17 is an accelerator switching device.
And these sensor devices 12, 13, 14,
15, 17, 21a, 21b, 23, 32, 3
3, 34, and 35 are connected to a control unit 40 composed of a microcomputer.

The control unit 40 includes a shift change control circuit 41 that determines whether or not to change the shift based on detection signals from the vehicle speed sensor 33, the accelerator opening sensor 12, and the shift position sensor 34. A synchronization determination circuit 4 that determines whether the rotational speeds of the main gear and the main shaft are synchronized based on detection signals from the countershaft rotation sensor 32 and the vehicle speed sensor 33.
2, a clutch intermittent control circuit 43 which controls the clutch actuator 22 by turning the clutch valve 23 ON and OFF based on the output of the determination circuit 42, and outputs an accelerator switching command to the accelerator control switching device 17 to manually operate the accelerator. An engine control circuit 44 for switching from to auto, and a shift control circuit 45 for controlling a shift actuator based on a detection signal from the shift position sensor 34 are provided.

FIG. 4 shows the basic control flow of the semi-automatic system.

First, the shift change control circuit 41 determines whether the signal from the selector 13 is neutral (step S1), and if YES, the transmission control circuit 45 outputs a control signal to the shift change actuator 35 to change the gear. The machine 30 is set to neutral and the control ends (step S2). If NO in step S1, it is determined whether or not the selector 13 is in reverse (step S3), and if YES, the transmission 30 is set in reverse and the control ends. If NO in step S3, it is determined whether auto range is specified based on the signals from auto button 14 and selector 13 (step S5). If YES, vehicle speed sensor 33, accelerator opening sensor 1
Based on the signal from 2, the target shift gear corresponding to the vehicle speed and accelerator opening is determined (step S6), and NO.
In this case, the target shift stage is designated as the stage designated by the selector 13 by the driver (step S7),
Both then proceed to step S8. In step S8, the shift change control circuit 41 determines whether or not a shift is necessary (step S8). If NO, the control ends; if YES, it determines whether or not to shift up (step S9), and if YES, it determines whether or not to shift up. If yes, shift up control is performed and the control ends (step S10); if NO, shift down control is performed and the control ends (step S11).

FIG. 5 shows the detailed flow of step S10 or S11.

When a shift request occurs, the control unit 40 fully closes the accelerator (step S20), turns the clutch OFF (step S21), sets the transmission to neutral (step S22), and then turns the clutch ON (step S23). ). Next, it is determined whether the main shaft gear rotational speed Ng is greater than the synchro rotational speed Nsyc (step S24). If the answer is YES, it is determined whether the main shaft gear rotational speed Ng is smaller than the sum of the synchro rotational speed Nsyc and the relative rotational speed △N that starts the shift change actuator operation (step S28), and if the answer is NO. If so, wait until it becomes YES, and only if it is YES, set the transmission in gear (step S29), release the accelerator (step S30), and end the control.

If NO at step S24, the accelerator is fully opened (step S25). Next, it is determined whether the rotational speed Ng of the main shaft gear is greater than the synchro rotational speed (step S26). NO.
If YES, the process returns to step S25, and if YES, the accelerator is fully closed (step S27) and the process proceeds to step S28.

FIG. 8 shows the detailed flow of step S21, in which the clutch disengagement control circuit 43 outputs a control signal to turn on the clutch valve 23 and switch it to the position, and air (not shown) is supplied to the pressure chamber of the clutch actuator 22. Direct air from source to clutch
Perform the OFF operation (step S210). then OFF
It is determined whether the detection switch 21a is turned on (step S211), and if YES, the control ends. If NO, it is determined whether a specified time (for example, 1 second) has elapsed (step S212), and NO
If so, the process returns to step S210, and if YES, the control is interrupted (step S213) and ends.

FIG. 9 shows the detailed flow of step S23, in which the clutch on/off control circuit 43 outputs a control signal to turn off the clutch valve 23 and switch it to the OFF position, exhausting the air in the pressure chamber of the clutch actuator 22. to turn on the clutch (step S230). Next, the ON detection switch 21b
is turned on (step S23).
1) If YES, control ends. If NO,
It is determined whether a specified time (for example, 2 seconds) has elapsed (step S232), and if NO, the process proceeds to step S2.
Returning to step S230, if YES, the control is interrupted (step S233) and the control is ended.

By the way, the step S210 or S2
30, the following control is performed assuming that the switch 21a or 21b that confirms the result of the operation always operates correctly, and if the switch 21a or 21b is out of order, the clutch actuator 22 is The next control must be performed before the operation is completed, which may cause problems for the system.

That is, in FIG. 8, if the OFF detection switch 21a is malfunctioning and is always on, the transmission will attempt to be set to neutral (step S22) before the clutch is completely turned off, so the gear The gear is forcibly pulled out with excessive surface pressure acting on the fork, which increases wear on the fork.
ON detection switch 21b is faulty and always ON
If it is, the accelerator is fully opened before the clutch is completely turned on (step S25), causing the engine rotation to rise more than necessary, and as a result, there is a problem that smooth gear shifting operations cannot be performed.

[Objective of the Invention] Accordingly, an object of the present invention is to provide an automatic transmission device for a vehicle that allows smooth shifting operation even when a failure occurs in the clutch disengagement detection means.

[Configuration of the invention] According to the invention, there is provided a control unit that performs gear change control, a clutch operation means that engages and engages the clutch, a shift operation means that shifts the transmission, an engine rotation control means that controls engine rotation, and a clutch operation means that controls the clutch. In an automatic transmission system for a vehicle, which includes a clutch disengagement detection means for detecting clutch disengagement, the control unit includes a failure determination means for determining a failure of the clutch disengagement detection means, and a failure determination means for determining whether or not the clutch disengagement is detected by the clutch operation means. An intermittent determination means is provided for determining whether or not the operation time has passed a specified time.

[Operation and effect of the invention] Therefore, the failure determination means determines the failure of the clutch discontinuity detection means necessary for the next operation,
When the clutch is malfunctioning, in the next operation, the clutch disengagement is determined not by the malfunctioning clutch discontinuation detecting means, but by the discontinuity determining means depending on whether or not the operating time of the clutch operating means has elapsed for a specified time. By doing this, you can reliably confirm the completion of intermittent switching, and as a result, you can perform smooth gear shifting operations.

[Preferred Embodiment] When carrying out the present invention, it is preferable that the clutch discontinuation detection means uses an OFF detection switch and an ON detection switch that close when the clutch is disengaged.

In implementing the present invention, it is preferable that the failure determination means and the intermittent determination means are provided as determination steps in the control flow of the shift change control section of the control unit.

When implementing the present invention, the operation time of the clutch operating means for determining whether or not the clutch of the discontinuation determining means is engaged is, for example, 1 second for clutch disengagement (OFF);
It is preferable to set the clutch engagement (ON) to 2 seconds, for example.

[Examples] Examples of the present invention will be described below with reference to the drawings.

Although the drawings of the present invention are the same as those of the conventional device, the control mode is different, and the control flow of the shift change control section 41 of the control unit 40 shown in FIG. Steps S46 (FIG. 7) and S36 (FIG. 6), which are failure determination means for detecting
Steps S35 (FIG. 6) and S, which are discontinuity determining means for determining discontinuation of the clutch based on the operation time of the clutch actuator 22 in the event of a failure of these switches.
45 (FIG. 7) are provided respectively.

Next, control aspects of these control flows will be explained.

FIG. 6 shows the control flow when the clutch is OFF.

The shift change control circuit 42 outputs a control signal from the clutch intermittent control circuit 43, turns the clutch valve 23 ON, switches it to the position, guides air from an air source (not shown) to the pressure chamber of the clutch actuator 22, and turns it OFF. (Step S3)
0). Next, turn off the inside of the microcomputer.
Flag 1 that turns ON when the detection switch is abnormal
It is determined whether or not it is turned on (step S31). If NO, turn off the OFF detection switch 21
Determine whether or not a is turned on (step S3)
2). If YES, the process moves to step S36, which is a failure determination means, and if NO, it is determined whether a specified time (for example, 1 second) has elapsed (step S3).
3), if NO, return to step S32 and select YES
If this is the case, the control is interrupted (step S34) and the control is ended.

If step S31 is YES, that is,
When the OFF detection switch 21a is malfunctioning,
The process moves to step S35, which is an intermittent determining means, and it is determined whether a prescribed time (for example, 1 second) has elapsed.
If NO, wait until it becomes YES, and when it becomes YES, that is, the clutch actuator 22
When the OFF operation time reaches the specified time, the clutch
It is determined that the OFF has been completed, and the process moves to step S36, which is a failure determination means. In step S36, the clutch is turned OFF and the ON detection switch 2 is turned OFF.
1b is off, that is, whether the ON detection switch 21b is normal. If YES, flag 2 is turned OFF (step S37), and if NO, that is, if ON detection switch 21b is out of order, flag 2 is turned OFF.
It is turned on (step S38) and the control ends. The specified time (1 second) in step S35 is the necessary and sufficient time required to complete the clutch OFF operation, so even if the OFF detection switch 21a is out of order, the clutch OFF will be completed and the gear shift will continue. The machine neutralizes smoothly and fork wear is prevented.

FIG. 7 shows the control flow when the clutch is ON.

The shift change control circuit 42 outputs a control signal from the clutch intermittent control circuit 43 to turn the clutch valve 23 to the OFF position and exhaust the air in the pressure chamber of the clutch actuator 22.
Turn ON (step S40). Next, ON detection switch 2 inside the microcomputer
It is determined whether flag 2, which is turned on when 1b is abnormal, is turned on (step S41).
If NO, it is determined whether the ON detection switch 21b has turned ON (step S42), and if YES, the process moves to step S46, which is a failure determination means, and if NO, it is set for a specified time (for example, 2 seconds) It is determined whether or not the time has elapsed (step S43). If NO, the process returns to step S42; if YES, the control is interrupted (step S44) and the control ends.

If step S41 is YES, that is, ON
If the detection switch 21b is out of order, the process moves to step S45, which is an intermittent determining means, and it is determined whether a prescribed time (for example, 2 seconds) has elapsed. NO.
In this case, wait until it becomes YES, and when it becomes YES, that is, turn clutch actuator 22 ON.
When the operation time reaches the specified time, it is determined that the clutch has been turned on and the process moves to step S46, which is a failure determination means. In step S46, the clutch is turned ON and the OFF detection switch 21a is turned on.
It is determined whether the switch is OFF, that is, whether the OFF detection switch 21a is normal. If the answer is YES, flag 1 is turned OFF (step S47), and if NO, that is, if the OFF detection switch 21a is out of order, flag 1 is turned OFF.
It is turned on (step S48) and the control ends. The prescribed time (2 seconds) in step S45 is the necessary and sufficient time required to complete the clutch ON operation, so even if the ON detection switch 21b is out of order, the clutch ON operation will be completed and the clutch ON operation will be completed. Even when the accelerator is fully opened, engine rotation is prevented from increasing more than necessary, and gear shifts are performed smoothly.

[Summary] As explained above, according to the present invention, even if a failure occurs in the clutch disengagement detection means, the clutch disengagement determination means determines whether the clutch is engaged or not, and as a result, smooth gear shifting operations can be performed.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram showing the clutch operating means of FIG. 1, FIG. 3 is a control block diagram, and FIG. 4 is a basic control flow chart of the semi-automatic system.
Figure 5 is a general control flowchart during gear shifting, and Figures 6 and 7 are the clutch of the present invention.
Control flowcharts showing OFF and ON control modes, Figures 8 and 9 are for conventional clutches.
FIG. 3 is a control flowchart showing OFF and ON control modes. 21a...Clutch OFF detection switch, 21
b...Clutch ON detection switch, 22...Clutch actuator, 23...Clutch valve,
40...control unit, 41...shift change control circuit, 43...clutch intermittent control circuit.

Claims (1)

[Scope of utility model registration request] A control unit that performs gear change control, a clutch operation means that engages and engages the clutch, a shift operation means that shifts the transmission, an engine rotation control means that controls engine rotation, and a clutch disengagement detection means that detects engagement and disengagement of the clutch. In an automatic transmission for a vehicle, a control unit includes a failure determining means for determining a failure of a clutch discontinuation detecting means, and a control unit that determines whether or not the clutch is engaged or disconnected when the failure determination means determines a failure of the clutch discontinuation detecting means, and determines whether or not the operation time of the clutch operating means has elapsed for a predetermined time. 1. An automatic transmission device for a vehicle, characterized in that an automatic transmission device for a vehicle is provided with an intermittent determination means for making a determination based on the following.