JPH04204347A - Inspection of brake force of vehicle provided with antilock control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a braking force testing method for an automobile equipped with an on-vehicle anti-lock control device.

[Prior Art] Automobiles equipped with on-vehicle anti-lock control devices need to be inspected to see if the anti-lock control device operates correctly before being assembled and shipped or during periodic inspections. An anti-lock control device is a device that efficiently brakes automobiles, and due to its nature requires sufficient inspection to ensure safety.

Inspection of anti-lock control devices generally involves checking whether the signal system sent from the wheel speed sensor to the anti-lock control circuit (electronic control circuit, hereinafter referred to as ABS @ control circuit color circuit) is being sent correctly, and checking whether the braking force is A braking force test is conducted to ensure that the required braking force is obtained.

The inspection equipment used for this inspection includes a brake tester equipped with a meter for measuring braking torque on a wheel drive unit consisting of a rotating roller that receives and rotates the front or rear wheels of the vehicle and its drive motor, and a brake tester that is equipped with a meter that measures braking torque. A from the wheel speed sensor connected via the check terminal provided.
It consists of an inspection unit that checks whether there is an abnormality in the wheel speed signal sent to the BSIIm circuit and controls the operation of the brake tester.

In the conventional method of testing braking force using the above inspection device, the rotating roller is started by turning on the ignition and soyon, and when the rotation reaches a certain rotational speed, the brake is stepped on and the braking force test begins. be done.

When the brake is pressed, a control signal is sent to the solenoid valve via the ABS control circuit from the inspection unit.

This control signal has a fixed pattern and is sent according to a program pre-installed in the electronic control circuit of the inspection unit.

This signal pattern is such that, for example, when the ABS is in 3rd place 1 control, signals for depressurization, holding, and pressurization are sent at predetermined intervals. In the case of two-position control, the pattern is such that signals for depressurization and pressurization are sent at predetermined intervals.

When such a pattern of control signals is sent, the braking force changes even though the brakes are being applied. This change in braking force is detected by the brake tester, and the detection signal is sent to the inspection unit to check the braking force. It is determined whether the change in power is normal. Then, the judgment made by the above inspection unit is as follows.
Conventionally, the absolute value of braking force was used.

[Problem to be solved by the invention] However, in the conventional braking force test described above,
A signal corresponding to the absolute value of the braking force is sent to the inspection unit,
Based on this, it was determined whether the braking force was normal or not, so the measured value changes significantly depending on the force applied when stepping on the brake pedal. When the brake pedal is first pressed strongly, the pressure reduction value and pressurization value fluctuate greatly, and when the brake pedal is pressed lightly, the fluctuation becomes small.

Therefore, in order to judge that the braking force is normal regardless of whether the pedal force is large or small, it is necessary to widen the range of the judgment criteria and set a loose standard. There was a possibility that defective products would be passed despite the shortage.

Conventionally, the only way to prevent such misjudgments from occurring is to set strict conditions for the force with which the inspector steps on the brake, which requires skill in the inspection and does not improve work efficiency. There were also problems.

This invention was made in view of the current state of the conventional braking force inspection method for automobiles equipped with the above-mentioned anti-lock control device B, and its purpose is to send a pseudo control signal to the anti-lock control device to control the anti-lock control device. We propose a braking force testing method that detects changes in power and tests whether the braking force - ratio is within a predetermined range, making accurate pass/fail judgments and improving work efficiency. It's about doing.

(Means for Solving the Problems) As a means for solving the above problems, in the present invention, when a car equipped with an anti-lock control device is stopped, a rotating roller is brought into contact with a wheel and driven to rotate, and the wheel is braked. During braking, the anti-lock control device is depressurized, held,
Controlling the operation of the control valve by sending a pressurization control signal from the outside in a predetermined pattern, detecting changes in the resulting braking force and determining the ratio of braking force before and after pressure reduction, and the ratio between pressure reduction and after pressure reduction. A braking force inspection method for vehicles equipped with an anti-lock control system was adopted in which the ratios of the maintained braking forces are determined and it is determined whether each ratio is within a predetermined range.

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

FIG. 1 is a diagram showing a state in which an automobile is set in an inspection apparatus for carrying out the braking force inspection method according to the present invention.

The automobile is equipped with an anti-lock control circuit (hereinafter abbreviated as ABS control circuit) 10 that automatically controls brake braking. The ABS control circuit 10 consists of a microcomputer, and as shown in FIG.
It includes a central processing unit (CPU) 12, a storage section 13, a drive circuit 14, a check terminal 15, and the like. When the vehicle is running, when the brake is pressed, the CPU 12 calculates the wheel speed, etc. based on the wheel speed signal from the wheel speed sensor S, and controls the opening and closing of the solenoid valve (2), which is an actuator, via the drive circuit 14.

The testing device for testing the operation of the ABS control circuit 1o consists of a test unit 20 and a brake tester 3°.
It is connected to the illI control circuit 1o.

The test unit 20 includes a connection terminal 21 and a relay unit 22.
, interface unit 23, sequencer 24.25
etc. Sequencer 24.

A brake tester 30 is connected to 25, and this brake tester 30 includes a motor 31, a rotating roller 32 driven by the motor, and a braking dynamometer 3 that measures the braking force.
3. It is equipped with a photoelectric switch 34 for detecting the presence or absence of wheels.

FIG. 3 shows a block diagram of the configuration of the interface unit 23. As shown, the interface unit 23
is equipped with input/output terminals 15'a, 15'b, interface circuits 231, 231', microcomputer 232, ink face circuits 233, 234, etc.

The microcomputer 232 contains a program for instructing a control signal for testing braking force according to the present invention. When a serial signal sent from the ABS control circuit 10 is received through the input terminal 15'a, a test control signal of a predetermined pattern is output from the microcomputer 232 through the output terminal 15'b to the ABsIJ1 circuit 1.
sent to o.

The sequencer 24 also includes a calculation unit that calculates the braking force value and ratio from a signal representing the braking force detected by the brake tester 30, and a determination unit that determines whether these values and ratio are within a predetermined range. It is included.

A braking force test is performed using the test device as described above as follows.

Connect the testing device as shown in Figure 1, and use the brake tester 30.
Place the front wheel (or rear wheel) on the Turn on the ignition IGN to start the ABsiil J11 circuit 10, turn on the power of the testing device, and turn on the motor 3 of the brake tester 30.
1 to rotate the rotary roller 32 and put it into a pseudo running state.

Anticock control starts when you step on the brake, but
In this case, this anti-lock control is applied to the ignition IGN.
A serial signal sent to the testing device 20 when the tester is turned on is sent to a mote controlled by a control signal according to a program of the interface unit 23.

The control signal of a predetermined pattern according to the program of the interface unit 23 generates a pressure reduction command, a holding command, and a pressurization command in a predetermined pattern within a certain period of time, and the resulting change in braking force is as shown in Fig. 4. It is a signal.

When the braking force changes according to the control signal, the change in braking force is detected by the braking dynamometer 33 and sent to the sequencer 24 as an electrical signal.

In the sequencer, based on the above signal, the calculation section calculates the braking force
, Y, Z absolute bonds are issued. The ratios of Y/X and Z/Y are determined from the obtained braking force values.

Next, the determination section compares the braking force value and the ratio value with a reference value to determine the braking state. For example, the braking force is determined to be normal if it is within the range of determination values such as 20%<Y/X<80% 105%<Z/Y<350%. If it is outside any of the above ranges, it will be judged as abnormal braking force and will be rejected.

The above inspection is performed for each wheel, for example, the left front wheel, the left front wheel, the right rear wheel, and the left rear wheel.

After testing the braking force, the brake pedal is released and the operation of the wheel speed sensor signal system and other switches is tested.

[Effects] As explained in detail above, the braking force inspection method according to the present invention detects changes in braking force controlled by an anti-lock control device that can reduce, maintain, and increase braking force, and determines the braking force before and after the pressure is reduced. In order to check whether the braking force is normal by determining whether the ratio of the braking force after depressurization and the braking force maintained after pressurization is within a predetermined range, the inspector can check whether the braking force is normal or not. Even if there are various differences, the test results can be judged correctly and the work efficiency of the test can be improved.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic block diagram of an inspection device for carrying out the braking force inspection method according to the present invention, FIG. 2 is a schematic block diagram of an ABS control circuit, FIG. 3 is a schematic block diagram of an interface unit, and FIG. FIG. 2 is a diagram illustrating changes in braking force due to pressure reduction, holding, and pressurization commands. 10...ABS control circuit, 15...Check terminal, 20...Test unit, 23...Interface unit,
30... Brake tester, 32... Rotating roller, 33... Braking dynamometer, S... Wheel speed sensor, ■...
・Solenoid valve. Patent Applicant Sumitomo Electric Industries Co., Ltd. Agent Kama 1) Text 2 Part 3
Figure 4

Claims (1)

[Claims] (1) When a car equipped with an anti-lock control device is stopped, a rotating roller is brought into contact with a wheel and driven to rotate, and while the wheel is being braked, control signals for depressurization, holding, and pressurization are sent to the anti-lock control device. is sent from the outside in a predetermined pattern to control the operation of the control valve, and changes in the resulting braking force are detected and the ratio of the braking force before and after pressure reduction and the ratio of the braking force maintained after pressure reduction and after pressurization are determined. A braking force inspection method for a vehicle equipped with an anti-lock control device, characterized in that the braking force of a vehicle equipped with an anti-lock control device is determined by determining whether each ratio is within a predetermined range.