JP2964803B2 - Abnormality detection method for vehicle transmission drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an abnormality in a vehicle transmission driving device.

[0002]

2. Description of the Related Art A transmission for a vehicle is provided with a shift fork for performing a gear shift, and a driver operates a change lever to drive the shift fork to perform a shift. By the way, in a large bus, since the engine and the transmission are arranged in the rear part of the vehicle body, the distance from the change lever arranged in the driver's seat becomes longer, and accordingly the operation force of the change lever becomes heavy, and the shift operation is performed. It becomes difficult to remove.

[0003] In view of this, a finger control transmission is provided, in which the gearshift operation by the change lever is handled by an electric and air pressure control function, and the gearshift is performed by a gearshift device so that the gearshift can be performed with an extremely light operating force. Transmission drive devices have been employed. This transmission drive device is disposed in the transmission 2 of the engine 1 as shown in FIGS.
Gear shift device 3 including a plurality of pneumatic actuators (not shown) for driving a shift fork and a plurality of solenoid valves Ma to Mn (FIG. 2) for driving these actuators, and an air tank 4 for supplying air to the actuators Sensors Sa to Sd disposed in the change lever mechanism 5 for detecting the position of the change lever in the select direction, and sensors Se to Sg for detecting the position of the shift lever in the shift direction (FIG. 3);
The sensors Sa ′ to Sd ′ which are arranged in the transmission 2 and detect the position of the gear in the select direction, the sensors Se ′ to Sg ′ which detect the position in the shift direction (FIG. 4), and the sensors of the change lever mechanism 5 To output a corresponding solenoid valve drive signal to drive the solenoid valve of the gear shift device 3 and to input a signal from a sensor of the transmission 2 as a feedback signal to control the gear to a predetermined gear. It is constituted by a machine control device 6 and the like.

The solenoid valves Ma to Mn are connected to terminals 6a, 6a 'to 6n and 6n' of the transmission control device 6 as shown in FIG. 2, and a terminal 6a to which the + side of the solenoid valve Ma is connected.
Is connected to the power supply + V, the terminal 6a 'connected to the negative side is connected to a switching circuit, for example, the collector of the transistor Tr, and the collector is connected to the abnormality detection circuit 7 including the high resistance R and the Zener diode Dz. . Terminals 6b, 6b 'to 6 to which other solenoid valves Mb to Mn are connected
The same applies to n and 6n '.

When the transistor Tr is turned on, the power supply + V
Current flows from the solenoid valve Ma through the path of the transistor Tr and the solenoid valve Ma is driven. The transmission control device 6 drives a plurality of electromagnetic valves in accordance with the shift position of the change lever mechanism 5, and controls the transmission 2 to a corresponding shift speed . Variable speed motor control device 6, the input from the abnormality detection circuit 7
In response to the signal, a search for an error location, that is, abnormality detection (self-diagnosis) is performed.

For example, when diagnosing the abnormality of the solenoid valve Ma, the transistor Tr of FIG. 2 is turned on to detect the presence or absence of the voltage at the terminal Ts of the abnormality detection circuit 7. That is, when there is no abnormality in the solenoid valve Ma or the harness (external circuit) 8 that connects the solenoid valve Ma to the terminals 6a and 6a 'of the transmission control device 6, a predetermined voltage is output to the terminal Ts. . However, if the solenoid of the solenoid valve Ma is disconnected or the harness 8 is disconnected in the middle P, the terminal Ts
No voltage is generated. Therefore, the abnormality of the solenoid valve Ma or the harness 8 can be detected by detecting the presence or absence of the voltage of the terminal Ts .

[0007]

THE INVENTION Problems to be Solved] However, the harness
If there is something abnormal in the source 8, that is, if there is a short
The solenoid valve Ma is always driven, and the other normal solenoid valve is
In some combinations, the transmission may be shifted to a position different from the shift position from the change lever , that is, to a gear position contrary to the driver's will.

[0008] The present invention has been made in view of the above, the shift operation by the shift lever, electricity and control functions of the air pressure is responsible, electrodeposition of variable speed drive for performing gear change by the gear shift device solenoid valves or harness It is an object of the present invention to provide an abnormality detection method for a vehicle transmission drive device in which abnormality detection is performed without driving the solenoid valve.

[0009]

According to the present invention, a shift operation by a change lever is performed according to the present invention.
The control function of electricity and air pressure is responsible, and the transmission control device drives a plurality of solenoid valves according to the shift position of the change lever to control the transmission to a corresponding shift speed. An abnormality detection circuit connected between the switching circuit and each of the switching circuits to detect an error portion, wherein the + side and the − side of each solenoid valve are respectively set to the first and second sides. It is connected between a power supply and ground via a switching circuit, and when controlling the solenoid valve, the first and second switching circuits are turned on and off simultaneously. When an abnormality is detected, the solenoid valve is driven. When a feedback signal input from a sensor that detects a gear position is different from a signal corresponding to the combination of the driven solenoid valves, the second switch of the driven solenoid valve is turned on. The abnormality detected by turning on only the first switching circuit to turn off the ring circuit
A current flows through the circuit to detect error points and
The abnormality detection circuit detects that the flowing current does not operate the solenoid valves.
The resistance is set to be high so as to be very small .

[0010]

When the solenoid valve is driven, the first and second switching circuits are turned on at the same time, and a current flows from the power supply through the first switching circuit, the solenoid valve, and the second switching circuit on the + side, and is deenergized. At times, these first and second switching circuits are simultaneously turned off . Can to perform the abnormality detection of the speed change motor drive apparatus and the time of shifting errors
Then , the second switching circuit is turned off and only the first switching circuit is turned on, and the abnormality detection circuit detects whether the solenoid valve is disconnected or not. Thus it is possible to perform Rukoto without abnormality detected by driving the solenoid valve.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 5 shows a drive circuit of a solenoid valve of the transmission control device 10 for carrying out the method of the present invention. The transmission control device 10 has connection terminals 10a and 10a 'to which a plurality of solenoid valves Ma to Mn are connected. , 10b, 10b 'to 10n, 10
n ′, and each of the terminals 10a, 10b to
10n is connected to the + side of each of the solenoid valves Ma and Mb to Mn, and the other terminals 10a ', 10b' to 10n 'are connected to the-side terminals of these solenoid valves Ma and Mb to Mn. You. The terminals 10a and 10a 'are connected to a power supply + via a switching circuit, for example, transistors Tr1 and Tr2.
V, connected to ground. That is, the terminal 10a is connected to the collector of the transistor Tr1, and the emitter of the transistor Tr1 is connected to the power supply + V. The terminal 10a 'is connected to the collector of the transistor Tr2, and the emitter of the transistor Tr2 is grounded. Each base of the transistors Tr1 and Tr2 is connected to a control circuit (not shown), and is controlled on and off.

An abnormality detection circuit 11 comprising a high resistance R and a Zener diode Dz is connected to the terminal 10a '. Other terminals 10b, 10b 'to 10n, 10n'
A switching circuit and an abnormality detection circuit similar to those of the terminals 10a and 10a 'are also connected. The operation will be described below.

When driving the solenoid valve Ma, the transmission control device 10 outputs a solenoid valve drive signal to output the transistor T
r1 and Tr2 are simultaneously turned on. Transistor Tr
When 1 and Tr2 are turned on, current flows from the power supply + V through the path of the transistor Tr1, the solenoid valve Ma, and the transistor Tr2, and the solenoid valve Ma is energized and driven. When the solenoid valve Ma is deenergized, the transistors Tr1 and T1
r2 are simultaneously turned off. As a result, the solenoid valve Ma
The negative side and the negative side are disconnected from the power supply and the ground side and deenergized.

In this manner, the plurality of solenoid valves are driven in accordance with the shift position of the change lever mechanism, and the transmission is controlled to the corresponding shift speed. Then, the transmission control device 10
After the output of the solenoid valve drive signal, when the feedback signal input from the sensor of the transmission is different from the signal corresponding to the combination of the output solenoid valves, it is determined that a shift error has occurred, and the pursuit of the error location, that is, Perform abnormality detection.

For example, when diagnosing the abnormality of the solenoid valve Ma, only the transistor Tr1 is turned on, that is, the voltage + V is applied to the + side of the solenoid valve Ma, the-side is released, and the abnormality detection circuit 11 The presence or absence of a voltage at the terminal Ts is detected.
For example, if the solenoid valve Ma is disconnected, for example, if the solenoid valve Ma is disconnected, or if the harness (external circuit) 12 connecting the solenoid valve Ma and the terminals 10a and 10a 'is disconnected in the middle P, no voltage is generated at the terminal Ts. Therefore, by detecting the presence or absence of the voltage of the terminal Ts, the presence or absence of the disconnection of the solenoid valve Ma or the harness 12 can be detected. In the abnormality detection, when a shift error occurs when controlling to a certain shift speed, a plurality of solenoid valves involved in the shift are inspected simultaneously.

If the solenoid valve Ma and the harness 12 are not disconnected, a predetermined voltage is generated at the terminal Ts of the abnormality detection circuit 11, and the transmission control device 10 determines that the solenoid valve Ma and the harness 12 are normal. Judge that there is. At this time, current flows through the path of the transistor Tr1, the solenoid valve Ma, and the abnormality detection circuit 11, but the current is very small because the resistance R is high, and the solenoid valve Ma does not operate. Therefore, even if a plurality of solenoid valves are inspected at the same time, none of the normal solenoid valves operate and the shift to a gear contrary to the driver's will is prevented. The transmission control device 10 indicates that there is a shift error due to disconnection of the solenoid valve Ma when the solenoid valve Ma is abnormal, and when the solenoid valve Ma is normal, the mechanical control of the transmission drive device is performed. Indicates that a gear shift error has occurred due to a malfunction.

[0017]

As described above, according to the present invention, the shifting operation by the change lever is controlled by the electric and air pressure control functions, and the transmission control device controls a plurality of electromagnetic waves in accordance with the shift position of the change lever. Driving the valve to control the transmission to the corresponding gear, connecting an abnormality detection circuit between the-side of each solenoid valve and each switching circuit,
In the abnormality detection method for a vehicle transmission driving device for detecting an error portion, the + side and the − side of each of the electromagnetic valves are connected between a power supply and a ground via first and second switching circuits, respectively. When controlling the first and second
When the switching circuit is simultaneously turned on and off to detect an abnormality, the solenoid valve is driven, and then a feedback signal input from a sensor that detects the gear position of the transmission corresponds to the combination of the driven solenoid valves. When the signal is different from the signal, the second switching circuit of the driven solenoid valve is turned off and only the first switching circuit is turned on, so that a current flows through the abnormality detection circuit and an error occurs.
-Abnormality detection circuit flows while detecting the location
The current shall be so small that it does not activate the solenoid valves
By setting the resistance to high as described above, it is possible to detect an abnormality of the transmission drive device without driving the solenoid valve when a shift error occurs, and the transmission shifts to a gear contrary to the driver's will. Is prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vehicle transmission drive device employing a finger control transmission.

FIG. 2 is a diagram illustrating a solenoid valve driving circuit of a conventional transmission control device.

FIG. 3 is a diagram illustrating a sensor that detects a shift position of the change lever mechanism of FIG. 1;

FIG. 4 is a diagram showing a sensor for detecting a gear position of a gear of the transmission of FIG. 1;

FIG. 5 is a solenoid valve drive circuit diagram of a transmission control device for implementing the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Transmission 3 Gear shift device 4 Air tank 5 Change lever mechanism 10 Transmission control device 11 Abnormality detection circuit Sa-Sg, Sa'-Sg 'Position detection sensor Ma-Mn Solenoid valve Tr1, Tr2 Transistor

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Shigeki Fukushima 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (56) References JP-A-55-103140 (JP, A) 60-81545 (JP, A) Fully open 1987-138626 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16H 59/00-63/48 B60K 20/00-20 / 08

Claims (1)

(57) [Claims] A shift operation by a change lever is performed by an electric and air pressure control function, and a plurality of solenoid valves are driven by a transmission control device in accordance with a shift position of the change lever to shift a corresponding transmission. In a method of detecting an abnormality of a vehicle transmission driving device for controlling an abnormality in a stage, connecting an abnormality detection circuit between the negative side of each electromagnetic valve and each switching circuit, and detecting an error location, The side and the-side are connected between the power supply and the ground via first and second switching circuits, respectively, and when controlling the solenoid valve, the first and second switching circuits are simultaneously turned on and off to detect abnormality. When the operation is performed, after the solenoid valve is driven, the feedback signal input from the sensor that detects the gear position of the transmission is different from the signal corresponding to the combination of the driven solenoid valves. At this time, the abnormality detection circuit is turned off by turning off the second switching circuit of the driven solenoid valve and turning on only the first switching circuit.
Current flows through the sensor
The detection circuit detects that the flowing current does not activate the solenoid valves.
An abnormality detection method for a vehicle transmission driving device, wherein a high resistance is set so as to be small .