JPH0446109Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to automatic transmissions for vehicles, and more specifically, to backup technology to enable normal control in the event of a failure in the position detection means of a transmission. .

[Conventional technology]

As an automatic transmission system for a vehicle that achieves both operability and fuel efficiency, the applicant has added a sensor and an actuator to a conventional mechanical clutch, transmission, and injection pump that functions as an engine rotation control means. By controlling these electronically, the transmission can be shifted manually (shifted up), and the shift pattern created by this manual operation is stored in the shift map of the memory. He previously proposed an automatic transmission system for vehicles that automatically shifts the transmission (see Utility Model Application No. 70,610/1986).

According to such an automatic transmission for a vehicle, when auto range is selected with the selector, the transmission is sequentially shifted up according to the shift pattern stored in the shift map in the memory, so the vehicle is not driven for a while. For example, there is no need for any gear shifting operations. It also functions as a semi-automatic system, allowing the driver to automatically shift to the desired shift position by simply specifying the desired shift position (shift range) using the selector, even when shifting manually. Therefore, the gear shifting operation is extremely facilitated.

The control flow when changing gears in such a system will be explained based on FIG. 5.

That is, when a shift change command is output from the shift change control means, the accelerator is forcibly controlled to be fully closed in S1, and then the clutch held in the engaged position is operated to the OFF (disconnected) position in S2. After confirming that the clutch has completely moved to the OFF position, the actuator as a shift operation means is operated in S3 to perform neutral position setting processing to set the transmission to the neutral position, and in S4 the clutch is moved to the neutral position. Return to ON (connected) position.
After that, in S5, the synchro rotation speed Nsyc and the gear rotation speed Ng are compared, and if Nsyc<Ng (YES), the process proceeds to S11, which will be described later. If Nsyc>Ng, proceed to S6, fully open the accelerator, and S
7, it is determined again whether Nsyc<Ng, and if YES, the accelerator is fully closed in S8, the gear is set in S9, and S
At 10, release the accelerator and finish. If NO, return to S6 and wait until Nsyc<Ng.
Proceed to step 8.

On the other hand, if Nsyc<Ng in S5, in S11,
Compare the gear rotation speed Ng with the sum of the synchro rotation speed Nsyc and the predetermined tolerance ΔN, and calculate Ng
If <Nsyc+ΔN (YES), the process proceeds to S9 where the gear is set, and the accelerator is returned to S10 to end the process. If NO, wait until Ng<Nsyc+ΔN and proceed to S9 and S10.

Incidentally, in such a system, the gear set is controlled as shown in FIG.

That is, to explain this, in S9-1,
The actuator of the transmission is turned ON, and in S9-2 it is determined whether the position switch of the transmission is ON. If the position switch is ON, the actuator is turned OFF and the next operation is started after the gear shift operation is completed. If the position switch is OFF, in S9-4 the specified time (e.g.
0.5 seconds) has elapsed, and if YES, proceed to S9-5 and turn off the actuator.
Performs error response processing control, but if NO, S
The process returns to 9-1 and S9-2 and repeats the determination in S9-2 until the specified time has elapsed.

In this way, this system not only saves time by detecting the completion of actuator operation using the position switch and moving on to the next operation, but also enables the detection of actuator failure. There is.

[Problem that the invention attempts to solve]

However, with conventional devices, if a gear slips out while driving, the position switch turns OFF from the ON state, but this may be due to a malfunction of the position switch or due to a gear slippage. There was a problem that it was not possible to determine whether

[Purpose of invention]

The present invention has been developed in view of the above-mentioned conventional problems, and its purpose is to provide an automatic transmission device for a vehicle that can reliably determine whether or not there is an abnormality in a position switch while driving. be.

[Means for solving problems]

In order to achieve the above object, the present invention, as shown in FIG. and a shift change control means for controlling the three means to execute a shift change of the transmission based on a determination by the synchronization means for determining whether or not synchronization has been performed, When a gear set incomplete signal is output from the position detecting means of the transmission in a vehicle automatic transmission system that performs control after the gear shifting operation is completed when the gear set completion signal is issued from the position detecting means. , a calculation means for calculating a coefficient representing the relationship between both the rotation sensor and the vehicle speed sensor from the detection output of each sensor, and comparing the calculated coefficient with the reduction ratio of the shift stage when the gear set incomplete signal is generated. The comparison means determines whether there is a failure in the position detection means based on the comparison result, and if the comparison values match, an error is displayed as a failure of the position switch, and if they do not match, the transmission is pulled out of gear. The configuration includes determination means for outputting a control command to once perform a neutral set operation as a result of the occurrence of a neutral set operation.

[Effect of invention]

When the position detection means (position switch) of the transmission is turned off, a coefficient representing the relationship between the rotation sensor and the vehicle speed sensor is calculated from the detection outputs of the rotation sensor and the vehicle speed sensor, and this calculated value and the position Compare to see if it matches the gear reduction ratio when the switch is OFF. If the comparison values match, an error is displayed indicating that the position switch is malfunctioning, and if they do not match, it is assumed that the transmission has slipped out of gear and a neutral set operation is performed.

[Example of idea]

Hereinafter, embodiments of the present invention will be described based on FIGS. 2 to 4.

FIG. 2 is a block diagram showing the hardware of an embodiment of the present invention, and FIG. 3 is a control block diagram.

In these figures, a transmission 3 is attached to an engine 1 via a mechanical clutch 2, and the output shaft of the transmission 3 and a drive axle (not shown) are interlocked via a propeller shaft 4. . 5 is a fuel injection pump attached to the engine 1.

The clutch 2 includes a clutch position detection device 6 that detects whether the clutch 2 is in a connected (ON) state or a disconnected (OFF) state based on its stroke and outputs a clutch ON/OFF signal. It is equipped with a clutch control device 7 for ON/OFF operation.

The transmission 3 also includes a gear rotation speed detection device 8 that calculates and outputs the rotation speed of the gear from the rotation speed of the countershaft, and outputs vehicle speed data related to the vehicle speed based on the rotation speed of the output shaft. a vehicle speed detection device 9 and the transmission 3
The vehicle is equipped with a shift set control device 10 for shifting the shift position via an actuator as a shift operation means, and a position switch 11 as a shift position detection device for detecting and outputting the current shift position of the transmission 3. 12 detects the position of the clutch pedal 13 and activates the clutch pedal.
Clutch pedal position detection device that outputs ON/OFF signals, 14 is an accelerator pedal, 15 is an accelerator switching device, 16 is a selector installed in the driver's cab, and in addition to auto range, it also controls each shift position including the neutral position. It can be selected arbitrarily by manual operation. The selector 16 has a built-in switch corresponding to each shift range, and outputs the selected shift range as an electrical signal.

On the other hand, a control unit 17 that controls the clutch 2 and the transmission 3 controls the selector 16 and the clutch pedal position detection device 1.
a shift change control unit 18 that outputs a shift change command when shift change requirements are satisfied (shift designation operation etc. is performed normally) based on a signal from shift change control unit 18; Synchronization determination that determines the synchronization state at a designated shift position based on the outputs of the position switch 11, vehicle speed detection device 9, and gear rotation speed detection device 8 when a change command is output, and outputs the determination result. 19, and a transmission control circuit 2 which receives a synchronization determination signal output from the synchronization determination section 19 and supplies a drive signal to the shift set control device 10.
0, a clutch control circuit 21 that controls the clutch control device 7 based on a command from the shift change control section 18, and a clutch control circuit 21 that controls the clutch control device 7 based on a command from the shift change control section 18, and a clutch control circuit 21 that switches the accelerator switching device 15 from manual to automatic when a shift change command is output, and controls the fuel. An accelerator control circuit 2 that supplies a rotation control signal to the engine 1 via an accelerator control device 22 attached to the injection pump 5
The main part consists of 3. The shift change control section 18 outputs an alarm signal to the transmission error lamp 24 or the clutch error lamp 25 when a malfunction occurs in the shift change operation. Further, the shift change control unit 18 sends a signal to a shift completion lamp (not shown) when the shift change operation is completed, and sends a signal to the double clutch command lamp 26 when the clutch operation and accelerator operation change to manual. , a signal is sent to the buzzer 27 in the case of shift completion and double clutch instruction. 28 is an accelerator fully closed detection device that detects that the accelerator of the fuel injection pump 5 is fully closed; 29 is a shift range detection device that detects the shift range specified by the selector 16; and 30 is the same selector 16. 31 is an exhaust brake ON relay that operates the exhaust brake to promote synchronization of the transmission 3, and 32 is a manual operation of the exhaust brake. Exhaust brake OFF relay, 33, to temporarily release the shift when changing the shift with the
34 is an exhaust brake control circuit that supplies control signals to the exhaust brake ON relay 31 and the exhaust brake OFF relay 32; 34 is an exhaust brake interlock designation button that instructs the exhaust brake control circuit 33 to link the exhaust brake with the engine brake;
35 is a transmission position indicator that displays the position (shift position) of the transmission 3, and 36 is a reset button that resets the shift completion lamp, buzzer 27, etc.

In the above configuration, manual operation, that is, lever 16a of selector 16 is operated to shift up according to a predetermined vehicle speed pattern, the vehicle speed at that time is stored in a memory provided in transmission control circuit 20, for example, and then When the lever 16a is set to auto range, the vehicle is controlled to automatically shift up using the vehicle speed pattern stored in the memory.

In addition, when operating as a semi-automatic system, that is, when transmission 3 is shifted according to the driver's will,
When the driver simply specifies a desired shift position (shift range) using the selector 16, the shift change to the target shift position is automatically performed.

Here, in the present invention, a gear set incomplete signal is output from the position switch 11, and the rotation sensors on the inlet side and the outlet side of the transmission 3, that is, the gear rotation speed detection device 8, and the vehicle speed sensor, that is, the vehicle speed Rotation speed detected by detection device 9
A calculation means for calculating a coefficient K representing the relationship between the two based on Ng and Nv; a comparison means for comparing the calculated coefficient with the reduction ratio of the shift stage when the gear set incomplete signal is generated; Based on the results, it is determined whether or not there is a failure in the position detection means. If the comparison values match, an error is displayed indicating that the position switch has failed, and if they do not match, it is assumed that the transmission has slipped out of gear and the system is temporarily set to neutral. The transmission actuator is configured to perform failure response control by the configuration including a determination unit that outputs a control command for operation.

Next, the control procedure when the OFF signal is generated from the position switch 11 will be explained based on the flowchart of FIG.

First, a coefficient K is calculated based on the detection outputs of the gear rotation speed detection device 8 and the vehicle speed detection device 9 (step
100). Next, the gear reduction ratio of the shift stage when the gear set incomplete signal is output from the position switch 11 is compared with the coefficient K (step 102).
If the comparison result in step 102 is determined to be a match, a message indicating that the position switch 11 has failed is displayed (step 104), and a flag is set to shift the shift set control to time management control.
Turn it ON (step 106) and end the processing in this routine.

On the other hand, if it is determined in step 102 that the comparison results do not match, a neutral set is performed once (step 108), and the process shifts to transmission gear set control (step 110). In this step, after establishing the neutral state of the transmission and position switch 11, control is executed to set the gear of the selector lever to the specified gear.

[Effect of idea]

As explained above, according to the present invention, when a gear set incomplete signal is output from the position detection means of the transmission, a coefficient representing the relationship between the rotation sensor and the vehicle speed sensor is calculated, and the calculated coefficient is The coefficient is compared with the gear reduction ratio of the shift stage when the gear set incomplete signal is generated, and based on the comparison result, it is determined whether or not there is a failure in the position detection means, and a control command is output in accordance with the determination result. Therefore, even when a gear set incomplete signal is generated from the position detecting means while the vehicle is running, it is possible to reliably determine whether or not there is a failure in the position detecting means, and an excellent effect can be obtained in that appropriate gear shift control can be performed. .

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the present invention;
The figure is a configuration diagram showing an embodiment of the present invention, FIG. 3 is a control block diagram, FIG. 4 is a flowchart for explaining the operation of the hardware, and FIG.
The figure is a flowchart of a conventional transmission device, No. 6.
The figure is a flowchart showing details of gear shift control in a flowchart of shift control of a conventional device. 1...Engine, 2...Clutch, 3...Transmission, 5...Fuel injection pump, 6...
Clutch position detection device, 7...Clutch control device, 9...Vehicle speed detection device, 10...Shift set control device, 11...Position switch, 16...
...Selector, 17...Control unit, 1
8...Shift change control section, 19...Synchronization determination section, 20...Transmission control circuit,
21...Clutch control circuit, 22...Accelerator control device, 23...Accelerator control circuit.

Claims (1)

[Scope of utility model registration request] a clutch operating means for engaging and disengaging the clutch;
The transmission is controlled by controlling the three means based on the judgment of the shift operation means for shifting the transmission, the engine rotation control means for controlling the rotation of the engine, and the synchronization means for determining whether synchronization has been achieved. and a shift change control means for executing a shift change, and the control after the end of the gear change operation is performed when a gear set completion signal is issued from the transmission position detection means after the gear shift. In the transmission, when a gear set incomplete signal is output from the position detection means of the transmission, a calculation means for calculating a coefficient representing the relationship between the rotation sensor and the vehicle speed sensor from the detection output of each sensor; a comparison means for comparing the correspondence between the coefficient and the reduction ratio of the shift stage when the gear set incomplete signal is generated, and determining whether or not there is a failure in the position detection means based on the comparison result, and when the comparison values match. an automatic transmission device for a vehicle, characterized in that the automatic transmission device for a vehicle is characterized in that it includes a determination means for displaying an error indicating that the position switch is malfunctioning, and outputting a control command for temporarily performing a neutral set operation when a mismatch occurs, indicating that the transmission has slipped out of gear. .