JPH0220929B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a method for checking the operation of an anti-skid valve using a brake testing device in a vehicle having an anti-skid valve (B60T,
G01M).

``Prior Art'' When a vehicle is suddenly braked while the vehicle is running, the wheels lock, but because the vehicle has inertia, it continues to move relative to the road surface, causing slippage between the tires and the road surface. As a result, the frictional force on the left, right, front, and rear wheels, that is, the four wheels, becomes unstable, causing the vehicle to skid or rotate. This phenomenon is called skid, and is often seen especially on wet asphalt roads and ice.

Therefore, in recent years, efforts have been made to control the actual brake distribution characteristics to bring them as close to the ideal curve as possible, and various anti-skid devices have been proposed. is appearing. There is currently a need for a method for checking whether the so-called anti-skid valve of a vehicle is operating as desired. However, no method has yet been proposed for checking the operation of the anti-skid valve under conditions that approximate actual driving conditions.

"Problems to be Solved by the Present Invention" In view of the recent demands as described above, the present invention attempts to solve the following problems.

To be able to check the operation of an anti-skid valve while using a brake testing device capable of measuring the braking force of a vehicle. Therefore, it is possible to save space and measurement time for inspection or measurement, and to improve work efficiency.

To simultaneously measure braking force on four wheels of a vehicle to be diagnosed, and to be able to confirm the operation of an anti-skid valve while reproducing a state that most closely approximates the actual driving conditions of the vehicle. Therefore, it is possible to make accurate confirmation judgments.

To be able to measure many vehicle types while using one brake testing device by inputting the determination values for each vehicle type into a determination value storage circuit for each vehicle type in advance.

To easily confirm the judgment result of the operation of an anti-skid valve.

"Means for Solving Problems" The present invention applies the brakes of a vehicle to be diagnosed after setting the rotational speed of a drive roller of a brake testing device within a certain speed range, thereby applying a braking force to the front wheels and rear wheels of the vehicle to be diagnosed. When the braking force of the anti-skid valve reaches a certain value, in other words, the test start detection circuit connected to the time setting timer is activated, and the braking force of the anti-skid valve reaches a certain value within the set time. It is characterized by measuring the number of repetitions of the upper and lower limits using a counter measurement circuit to confirm the operation of the anti-skid valve.

"Embodiments of the Present Invention" The present invention will be described in detail with reference to the embodiments shown in the drawings.

In one embodiment of FIGS. 1 to 3, reference numeral 1 denotes a brake testing device capable of measuring the braking force of a vehicle to be diagnosed. Reference numeral 2 denotes an elongated drive roller that is driven to rotate by a drive source 3 such as a motor, and as shown in FIG. , D are provided on the floor surface or the base plate 4. Reference numeral 5 denotes a plurality of brake rollers arranged in parallel at predetermined intervals in front of these drive rollers 2, and a plurality of long grooves are formed in the outer periphery of these brake rollers 5 in the longitudinal direction. Reference numeral 6 denotes a power transmission member such as a timing belt that rotates these brake rollers 5 synchronously with the driving rollers 2 facing each other. 7 is interposed between the drive roller 2 and the brake roller 5, and each wheel A, B, C, D of the vehicle to be diagnosed.
This is a lift plate of a lift mechanism (not shown) that can lift up. Reference numeral 8 denotes an elevating safety roller that is provided in front of the brake roller 5 and can prevent the vehicle to be diagnosed from jumping out from the brake roller. Reference numeral 9 is provided on the base plate 4 at the inner middle part of the left and right lift plates, and is in contact with the inner side of each wheel A, B, C, and D of the vehicle to be diagnosed, and is pressed in a direction perpendicular to the circumferential direction of the wheels. It is a link mechanism that has a roller at its tip. Reference numeral 10 connects a wheel base 11 which is adjustable in position on the other base plate 4A which is fixedly provided on the floor surface, and a chain 12.
This moving device 10 is a moving device that can be moved back and forth via a base plate 4A, and is provided at a position approximately in the center of one side wall of the base plate 4A. 13 is a wheel base position detecting device that can detect the amount of movement of the wheel base 11 when it is moved by the moving device 10, and this wheel base position detecting device 13 is located near the end of one side wall of the base plate 4A. It is set in. 14 is a braking force detector attached to each of the drive sources 3 for detecting the braking force of the vehicle to be diagnosed. Reference numeral 15 denotes an operation box that is placed at an appropriate location on the floor surface and issues various inspection instructions to a worker or a diagnostician. 16 is a control device that controls these operation boxes 15. Reference numeral 17 denotes a display device provided on the floor for displaying work instructions to the worker and determination of the operating state of the anti-skid valve, which will be described later. Therefore, the present invention, for example,
The operation of the anti-skid valve of the vehicle to be diagnosed is confirmed using the brake testing device 1 having the above configuration.
Specifically, the rotational speed of the drive roller 2 of the brake testing device 1 is set to a certain speed range, for example, corresponding to the vehicle speed.
After setting the speed to around 25km/h, apply the brakes of the vehicle to be diagnosed, and check the front wheels A, B and rear wheels C, D.
During full braking, the operation of the anti-skid valve is understood as a change in braking force, and the number of repetitions of the upper and lower limits of the limited braking force range within a certain period of time is detected, and then a judgment circuit etc. is used to determine the anti-skid valve operation. Check and judge the operation. The steps or means up to the confirmation judgment are as shown in FIG. That is,
20 measures the braking force in the conventional manner using the brake test device 1, and automatically diagnoses the operation of the anti-skid valve when all items such as the sum of the front wheels, rear wheels, and parking, and the difference between the front wheels and rear wheels pass. This is a push-button type vehicle type setting device that allows you to select the vehicle to be diagnosed. Reference numeral 21 selects a judgment value for the car model, which is a product name such as Bluebird, Skyline, or Sunny, selected by the car model setting device 20 from the car model judgment value storage circuit 22, and multiplies the judgment value by a specified number. This is a judgment reference value calculation circuit that calculates a reference value. 23 receives an instruction from the determination reference value calculation circuit 21 about the reference value a (see FIG. 3) of the braking force of the anti-skid valve at which the test should be started, and then operates the left and right front wheels A, B and the rear of the vehicle to be diagnosed. Wheels C, D
This is a test start reference value detection circuit that turns on the time setting timer 24 when the braking force against the brake reaches the reference value a. Reference numeral 25 indicates upper and lower limit reference values b and c (see Fig. 3) which are suitable for front wheels A, B and rear wheels C, D from the judgment reference value calculation circuit 21.
This is an upper/lower limit detection circuit which receives an instruction and detects the upper limit b and lower limit c of the braking force of the anti-skid valve within a certain range Y within the set time X of the time setting timer. A counter measuring circuit 26 is connected to the upper and lower limit detection circuit and measures the number of times the braking force of the anti-skid valve is repeated in the predetermined range Y within the set time X. 27 is connected to this counter measuring circuit 26 and compares the measured number of repetitions of the upper and lower limits with the number of repetitions set in the pass/fail setting number memory circuit 28 inputted in advance for each vehicle model to confirm the operation of the anti-skid valve as pass/fail. This is a judgment circuit that makes a judgment. The determination result of this determination circuit is displayed on the display device 17 mentioned above. Now, if the trajectory of the braking force of the anti-skid valve of the vehicle to be diagnosed on the drive roller 2 and brake roller 5 of the brake testing device is as shown in Figure 3, then the upper limit in a certain range Y within a set time The number of times b and lower limit c are repeated up and down, or six times in total. Therefore, in this case, if the set number of passes for the selected vehicle to be diagnosed is five or more, the determination circuit 27 compares the two numbers and determines that the vehicle has passed. On the other hand, if the set number of passes is 7 or more, the number of up and down repetitions of 6 does not reach it, so the judgment circuit 27 makes a judgment of failure.

As shown in Figure 2, the judgment circuit makes a judgment on each of the four wheels, front wheels A and B and rear wheels C and D.The overall judgment is that if all four wheels exceed the set number of times, it is passed; It is desirable to reject the test if even one of the wheels does not reach the set number of times. In addition, it is preferable that the determination circuit 27 has a function of determining pass/fail for each of the four wheels and displays the results on the display device 17.

"Effects of the Present Invention" As is clear from the above description, the present invention can provide the following effects.

(1) The anti-skid valve operation of a vehicle can be checked using a brake testing device that can measure the braking force of the vehicle.

Therefore, there is no need for special equipment or space to specifically measure anti-skid valve vehicles, and anti-skid valves can be automatically tested after diagnosing and measuring other items such as braking force tests on the vehicle being diagnosed. Since the operation of the valve can be confirmed, measurement time can be saved, and therefore the efficiency of measuring the vehicle to be diagnosed can be improved.

(2) It is possible to check whether the anti-skid valve is operating normally or not by adapting it to the actual driving conditions of the vehicle. That is, by using the brake testing device 1 which is an embodiment of the present invention, it is possible to simultaneously measure the braking force on four wheels of the vehicle to be diagnosed. Therefore, it is possible to confirm and determine the operation of the anti-skid valve while reproducing a state that most closely approximates the actual driving conditions of the vehicle.

(3) By adopting the anti-skid valve confirmation/judgment method or means according to the embodiment of the present invention, it is possible to measure many types of vehicles while using one brake testing device 1.

(4) In the case of an embodiment in which the judgment circuit can make a pass/fail judgment for each of the four wheels of the vehicle being diagnosed, when making a fail judgment, the braking force of which wheel is judged to be a failure must be repeatedly measured. Can be done.

(5) In the case of an embodiment in which the brake testing device is equipped with an elevating safety roller, the operation of the anti-skid valve can be measured without the vehicle to be diagnosed deviating from the drive roller during full braking.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the brake testing device used in the present invention, FIG. 2 is a block diagram showing the process of confirming and determining the operation of the anti-skid valve of the present invention, and FIG. FIG. 2 is an explanatory diagram showing the trajectory of the braking force of the anti-skid valve of the diagnostic vehicle. 1... Brake test device, 2... Drive roller, A,
B...front wheel, C, D...rear wheel, 4, 4A...base plate, 5...brake roller, 8...safety roller, 10
...Movement device, 11...Wheelbase, 14...Braking force detector, 17...Display device, 20...Vehicle type setting device, 21...Judgment reference value calculation circuit, 22...Judgement value storage circuit for each vehicle type, 23...Test start reference value Detection circuit, 24... Time setting timer, 25... Upper/lower limit detection circuit, 26... Counter counting circuit, 27... Judgment circuit, 28... Pass setting number of times storage circuit.

Claims (1)

[Claims] 1. After setting the rotation speed of the drive roller of the brake testing device to a certain speed range, the brakes of the vehicle to be diagnosed are applied, and the braking force to the front wheels and rear wheels of the vehicle to be diagnosed reaches a certain value. The test start detection circuit connected to the time setting timer is activated, and the counter measurement circuit measures the number of times the braking force is repeated in a certain range of the anti-skid valve within the set time. A method for certifying the operation of an anti-skid valve using a brake testing device including a process of a judgment circuit that checks and judges the operation of the anti-skid valve by comparing it with a set number of times. 2 The rotation speed of the drive roller is 25 km/h, which corresponds to the vehicle speed.
A method for checking the operation of an anti-skid valve using the brake testing device according to claim 1, characterized in that the test result is around H. 3. Using the brake testing device according to claim 1, wherein the wheelbase having the drive roller corresponding to the rear wheel of the vehicle to be diagnosed is adjustable in position by a moving device. How to check the operation of the anti-skid valve.