JPH0658845A - Antilock brake system inspection method for vehicle - Google Patents

Abstract

PURPOSE:To determine good or bad of a brake system by rotating a pair of rollers carrying right and left wheels, opening a brake valve for a specified wheel at the time of braking and rotating the brake valve together with the rollers, and making a decision that the brake system is normal if the other wheel slips tray a predetermined amount. CONSTITUTION:An air reservoir tank 1 is coupled through a brake pedal 2 and a double check valve 3 interlocked therewith to a rear booster 5. Solenoid valves MV1-MV4 are coupled through a front booster 4 and a booster 5, respectively, with a pedal 2. At the time of inspection, right and left wheels are carried on a pair of rotating rollers while at the time of braking, the solenoid valves MV1-MV4 in a brake circuit for a specified wheel are opened through a controller 6. The specified wheel follows the rotation of roller but the other wheel slips through braking. If the slip matches a predetermined value, a decision is made that the antilock brake system for the specified wheel is normal. Preferably, test operation is carried out through a data communication means based on an external signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects the rotation speeds of at least three wheels by a rotation sensor, calculates a pseudo vehicle body speed by a control device in accordance with signals from the rotation sensors, and detects the lock of the wheels. The present invention relates to a method for inspecting an antilock brake device for a vehicle having a valve that releases a brake pressure of a locked wheel.

[0002]

2. Description of the Related Art An inspection method in which a wheel is placed on a pair of rollers and rotated, a brake is applied to generate a brake torque, and a braking force is inspected is widely used. And
In the case of a brake having an anti-lock brake device, a functional test of the control unit is performed, and after the wheels are placed on a pair of rollers and rotated as described above, the brake pedal is depressed to generate a brake torque, and the external tester is used. There is known an inspection method for inspecting the operation of the antilock function by greatly changing the pseudo vehicle speed signal input from the vehicle (for example, see Japanese Patent Laid-Open No. 3-21139).

[0003]

However, in the above method, it is possible to inspect whether the antilock is activated or not, but the wheel speed sensor provided on each wheel or the incorrect connection between the left and right of the hydraulic / pneumatic circuit is There was a problem that both left and right wheels could not be detected because they ride on the same roller.

[0004]

[Knowledge] Since the anti-lock brake device has a wheel rotation sensor and a control device, it has been found that the quality of the anti-lock brake device can be detected by instructing the opening / closing of the valve of each wheel using the control device. .

Therefore, the present invention is based on the above findings,
An object of the present invention is to provide an inspection method for a vehicle anti-lock brake device, which inspects the quality of each wheel of the anti-lock brake device using a conventional inspection device.

[0006]

According to the present invention, the rotational speeds of at least three wheels are detected by a rotation sensor, and a pseudo vehicle speed is calculated by a control device based on signals from the rotation sensors to lock the wheels. In an inspection method of a vehicle anti-lock brake device having a valve that detects and releases the brake pressure of the locked wheel, a left and right wheel is placed on a pair of rotating rollers, the rollers are rotated, and a brake is applied. Sometimes the control device opens the valve of the brake circuit of the specified wheel and causes the specified wheel to rotate at the same speed as the roller,
Provided is a method for inspecting an antilock brake device for a vehicle, which determines that the antilock brake device for a designated wheel is normal when the other wheel rotates late by a predetermined slip amount.

[0007]

In the method for inspecting an antilock brake device for a vehicle constructed as described above, if there is a defect in a member or connection that constitutes the antilock brake device, even if the valve of the designated wheel is opened when the brake is actuated. Since the braking force of the wheel is not released, it is possible to easily know a failure of a member, erroneous piping, erroneous wiring, or the like.

Further, the above inspection method can be inspected by using a conventional test apparatus.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A data communication means is provided in a control device so that a remote test operation can be performed by a signal from the outside.

When the ROM and RAM of the control unit are insufficient in capacity, they can be supplemented by an external control unit.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an antilock brake system (A
BS), the air reservoir tank 1 is connected to the rear booster 5 via a brake pedal 2 and a double check valve 3 (DCV) interlocked with the brake pedal 2. The solenoid valves MV1 and MV2 for changing the hydraulic pressure of the front wheels are connected to the brake pedal 2 via the front booster 4, and the solenoid valves MV3 and MV4 for changing the hydraulic pressure of the rear wheels are connected to the brake pedal 2 via the rear booster 5 and the double check valve 3. It is connected to the.

The control unit 6 controls the hydraulic pressure of each wheel by calculating the pseudo vehicle speed and the slip ratio of each wheel based on the signal from the wheel speed sensor SS of each wheel.

FIG. 3 shows a block diagram of the inspection indicator, which includes a data communication means 7 for exchanging data with an external device, a wheel designation parameter and program 8, a monitor data interpreting means (including ROM and RAM) 9, and a keyboard. The interpreting means 10 and the screen display means 11 are respectively the control unit 1
Connected to 2.

FIG. 2 shows a block diagram of the control unit 6, which has input / output means (I / O means).
The solenoid valves MV1 to MV4 and the wheel speed sensor SS are connected to 15.

The control unit 20 is an ABS of a designated wheel.
The control unit 20 is connected to the I / O means through the mode execution means 16, the wheel speed, the solenoid valve position, and the pump monitor means 18, respectively, and the control unit 20 thereof has the data communication means 17 and the parameter interpretation means 19 (including ROM and RAM). Respectively connected to.

The operation flow chart of FIG. 4 and FIG.
The inspection method will be described from the ABS control device 6 side also with reference to FIG.

First, it is determined whether or not the communication buffer is arriving (step S1). In the case of NO, it is judged whether or not the time has expired in 500 milliseconds (ms) (step S2), and YE
If it is S, it is sent to the communication failure recovery process, and if NO, the return data communication is confirmed. If YES in step 1,
It is determined whether or not it is an OA (Hex) incoming call (step S3).
If NO, it is determined whether or not the incoming call is 30 (Hex) (step S4). If NO, send it to the faulty incoming call recovery process and Y
If it is ES, 30 (Hex) is transmitted to the diagnostic device within 500 ms and the process ends (step S5).

If YES in step S3, OA (H
ex) is transmitted to the diagnostic device of FIG. 3 by the communication means 17 within 500 ms (step S6). That is, the test is started. Then, it is determined whether or not the communication buffer has arrived (step S7). In the case of NO, it is judged whether or not the wave 500 milliseconds has expired (step S8), and if YES, it is sent to the communication failure recovery processing, and in the case of NO, it returns.

If YES in step S7, the parameters (direction designation of the test wheel and the solenoid valve) are stored (step S9). Then, the parameters are echoed back to the diagnostic device of FIG. 3 (step S10).

Then, it is determined whether or not the communication buffer is received (step S11). In the case of NO, it is judged whether or not the time for 500 milliseconds has expired (step S12), and if YES, it is sent to the communication failure recovery processing, and in the case of NO, it returns. If YES in step S11, it is determined whether or not an FF (Hex) call has arrived (step S13). If NO, send to the communication failure recovery process, and if YES, change the instruction parameter (step S14), send the designated monitor item to the diagnostic device (step S15), and return to step 1 to repeat the same control. Then, the ABS inspection of each wheel is executed.

That is, the inspection of each wheel is repeated by instructing which wheel of the on-off valve is changed as shown in FIG. 7 to execute the monitor item.

Next, the operation of the test indicator for instructing the ABS control unit to perform a test will be described with reference to FIG.

First, the test item information guide is transmitted (step S1). Then, it is checked whether or not it is normally transmitted, and if it is transmitted, the parameter information guide is transmitted (step S2).

Similarly, after checking the incoming call, FO
When (Hex) transmission is started (step S3), the inspection is performed.

During the above, on the monitor which is the screen display means of the test indicator, the ABS inspection is selected as a work item, the air is bleeded as work preparation, the front wheels are left to right, and the rear wheels are left to right in this order. The screen prompts you to test, release the parking brake, press the brake pedal, and then touch the Start Inspection key.

When the inspection is started, for example, the display such as Charin Soku FL 2 km / h, ABS valve FL hosi, hydraulic pump OFF, start, end, etc. is displayed on the monitor (step S4). Then, next to the end screen, a screen indicating whether there is an abnormality appears.

Then, it is judged whether or not the parameter setting is changed (step S5). If YES, the procedure returns to step S1 to continue the test, and if NO, it is judged whether the test is finished (step S6). If YES, the control is ended, and if NO, 12 (Hex) is transmitted and step S4 is performed.
Before (step S7), monitoring is continued.

[0029]

Since the present invention is constructed as described above, each wheel can be inspected if the antilock brake device is abnormal, and failure, erroneous piping, erroneous wiring, etc. can be easily performed. You can know

Further, if the front wheels are sequentially tested by the test indicator, it can be used for off-line inspection on the production line and the inspector can inspect the vehicle while he / she is in the vehicle, so that no extra man-hours are required.

[Brief description of drawings]

FIG. 1 is an ABS configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram of the electronic control device of FIG.

FIG. 3 is a block diagram of an inspection indicator.

FIG. 4 is an operation flowchart of FIG.

5 is an operation flowchart of FIG.

FIG. 6 is a diagram illustrating items and parameters of an ABS function test.

FIG. 7 is a diagram showing an example of torque change in a functional test.

[Explanation of symbols]

 1 ... Air reservoir 2 ... Brake pedal 3 ... Double check valve 4, 5 ... Booster 6 ... Electronic control unit 7, 17 ... Data communication means 9 ... Monitor data interpreting means 11 ... Screen display means 16 ... Designated wheel ABS mode execution 19 ... Parameter interpretation means

Claims (1)

[Claims] 1. A rotation sensor detects rotation speeds of at least three wheels, a pseudo vehicle speed is calculated by a control device based on signals from the rotation sensors, a lock of the wheels is detected, and a brake of the locked wheels is detected. In an inspection method of a vehicle anti-lock brake device having a valve for releasing pressure, left and right wheels are placed on a pair of rotating rollers, the rollers are rotated, and a brake circuit of a specified wheel is controlled by a control device at the time of braking operation. The anti-lock brake device of the specified wheel is judged to be normal when the valve is opened, the specified wheel is rotated at the same speed as the roller, and the other wheel is rotated by a predetermined slip amount slowly. Inspection method of lock brake device.