JPH0567905B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is designed to easily and precisely determine the function of other vehicles equipped with anti-skid brakes (hereinafter referred to as ABS vehicles) by measuring the maximum braking force. Regarding the brake tester.

(Conventional technology) In recent years, efforts have been made to improve driving stability during sudden braking.
As many ABS vehicles are being produced, there is a demand in the market for a brake tester with ABS function determination as a braking force testing device for these vehicles.

Conventionally, this type of brake tester, as disclosed in Japanese Patent Application Laid-Open No. 1-148649, has been designed to measure a roller on which the tires of a test vehicle are placed, a motor to drive the roller, and a load between the tire and the roller during braking. Some vehicles are equipped with a detector that detects fluctuations, and after the tires are rotated at high speed, the brakes are operated and the braking condition of the vehicle is measured by the detector.

However, this method required a high-speed, high-output motor and had the problem of not being able to perform measurements under road conditions with a low coefficient of friction, where ABS vehicles perform their original function.

For this reason, the applicant formed a horizontal groove on one side of the circumferential surface of the roller to provide a high friction coefficient part, and
The other side peripheral surface is formed into a smooth surface to provide a low friction coefficient area, and when measuring the maximum braking force, the tire is placed on the high friction coefficient area and the roller is rotated at a relatively constant speed, while when determining the ABS function, the tire is placed on the high friction coefficient area. We have developed a brake tester in which the tire is transferred to a low friction coefficient area and the roller is rotated at a relatively high speed to achieve the above-mentioned purpose.
It has been filed as No. 73388 (Jitsuhei 4-54436).

(Problem to be solved by the invention) However, in the tester of this application, as a result of providing two types of friction coefficient parts on the circumferential surface of the roller, the roller becomes long and the tester becomes large accordingly. Since the space between the rollers is restricted, there is a problem in that it becomes difficult to install pits required for inspecting and adjusting the underside of a vehicle during measurement, for example.

In addition, when determining the ABS function with the above tester,
Since all four wheels of the test vehicle are placed on areas with a low coefficient of friction, the wheels that lock are determined by heterogeneous conditions such as tire wear and ground contact area, making it possible to judge the ABS function based on specific wheels. I couldn't do it.

Therefore, even if the tester determines that the ABS function has failed, it is not possible to identify the parts to be adjusted or repaired as in the past. It was unreasonable to have to replace a series of related parts such as valves.

The present invention solves these problems and makes it possible to miniaturize this type of tester, perform maintenance inspections on the underside of the test vehicle during measurement, and make it possible to determine the ABS function for specific wheels. The purpose of this invention is to provide a brake tester that allows accurate testing.

(Means for Solving the Problems) Therefore, the brake tester of the present invention includes a roller having a high friction peripheral surface on which a wheel can be placed, a driving means capable of driving the roller, and a braking force of the roller. A plurality of brake tester units are equipped with detectable braking force detection means, and the signals inputted from the braking force detection means are stored and calculated, and based on judgment values stored in advance with this information as conditions, the brake test is performed. In a brake tester having a controller for determining the pass/fail of power, the torque of a predetermined roller can be set to be lower than the torque of other rollers, and this kind of tester can be miniaturized.
This feature allows for maintenance inspection of the underbody of the test vehicle at the time of measurement, as well as the ability to determine ABS function based on specific wheels, making it possible to perform this type of measurement precisely.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In Figs. 1 to 3, 1 is a test space provided on the floor of an automobile repair shop, etc., and a vertically long pit 2 is placed in the center of the test space. A brake tester unit 3 for the front wheels is installed on both sides of the pit 2.
3, rear wheel brake tester unit 4,
4 is installed.

The brake tester units 3 and 4 have substantially the same structure, and each includes a pair of rollers 6 on which wheels 5 of a test vehicle (not shown) can be placed on a circumferential surface with a groove formed therein, and a pair of rollers 6 on which wheels 5 of a test vehicle (not shown) can be placed. 6, a transmission means 7 such as a chain and sprocket disposed between the rollers 6, 6, a wheel boarding lift 8 disposed between the rollers 6, 6, and a load cell etc. capable of inputting a signal to a controller to be described later. The braking force detecting means 9 is also provided.

In addition, the brake tester units 3 and 4 are
A drive means 10 such as a torque-controllable motor that is ON/OFF controlled by the controller, and a drive means 1 by a control signal from the controller.
Torque control device 11 capable of variable control of zero torque
and a transmission means 12 such as a pulley and a belt disposed between the drive means 10 and the one roller 6.
It has

The brake tester unit 4 on the rear wheel side is
The mount 13 is installed on a mount 13, which is movable along a pair of die rails 14 arranged in the longitudinal direction of the test vehicle. (omitted).

One end of the screw shaft 15 is connected to a wheelbase adjustment motor 16, which is installed between the brake tester units 3 and 4, and whose operation is controlled by a controller 17.

The controller 17 has a built-in microcomputer, for example, and inputs the vehicle type information of the test vehicle, the maximum braking force signal from the braking force detecting means 9, and the braking force signal from the braking force detecting means 9 when determining the ABS function to the computer. and the number of passing times n _U , n _L ,
In other words, it is possible to input the number of times the braking force, which changes moment by moment, passes through the upper and lower reference limits f _U and f _L with one brake operation, and the computer inputs ON/OFF signals to the drive means 10, Control signals for each torque control device 11, wheel base adjustment motor 16 and wheel boarding lift 8
It is possible to output ON/OFF signals for the

On the other hand, the above-mentioned computer contains the wheelbase of each vehicle type, the braking force judgment value of the sum and difference of the left and right braking forces of the front and rear axles, and the upper and lower limit reference values f _U , f of the braking force when determining the ABS function. _L and the number of times N _U and N _L of passing the reference are stored.

Then, the computer calculates the sum and difference of the front and rear axles based on the input maximum braking force signal, and compares the calculated value with the braking force determination value to determine whether the result is acceptable. At the same time, the magnitude of the number of passes n _U , n _L at the time of ABS function judgment is compared with the reference number of passes N _U , N _L to determine whether the result is pass or fail, and these judgment signals are sent to the display lamp on the display panel 18. It is possible to output to 19.

FIG. 4 shows another embodiment of the invention, in which the same reference numerals are used for corresponding components as in the previous embodiment.

In this embodiment, instead of variably controlling the driving force of the driving means 10 by the torque control device 11 when determining the ABS function, a clutch device 20 that intermittents the driving force of the driving means 10 and a clutch device 20 that controls the operation of the device 20 are used. The clutch control device 21 is used to cut off the drive of the roller 6 on which the test wheel is mounted, or to make it in a semi-connected state, thereby simplifying the torque control described above.

(Function) The brake tester configured as described above uses a roller 6 having grooves on its circumferential surface to measure the maximum braking force as will be described later.
Since the ABS function can be determined, the length of the roller can be approximately halved compared to a roller with two types of friction coefficient parts, and the tester can be made smaller and lighter.
Since a large space can be secured between the holes 6 and 6, a pit 2 large enough for a worker to enter can be provided in the area.

Therefore, by having the operator enter the pit 2 during a series of measurements to be described later, it is possible to carry out maintenance and inspection work on the underside of the test vehicle.

Next, when measuring the maximum braking force using the above tester, it is carried out in the same manner as in the conventional method.

That is, the model of the test vehicle, for example, an ABS vehicle, is registered in advance in the controller 17, and when the vehicle model is registered, the controller 17 registers the wheelbase of the registered vehicle, the upper and lower limits of the braking force of each wheel 5, and the front axle. and the braking force judgment value of the sum and difference of the left and right braking forces of the rear axle, the upper and lower limit standard values f _U and f _L of the braking force used in the ABS function judgment test, and the number of times the standard is passed.
N _U and N _L are read out, and based on the wheel base information, the wheel base adjustment motor 1
A control signal is output to 6 and 16.

Therefore, the motors 16, 16 are driven, and the power thereof is transmitted via the screw shafts 15, 15 to the frames 13, 13, which together constitute the screw mechanism, and the frames 13, 13 are connected to the guide rail 1.
4 and 14, and stops at a position commensurate with the predetermined wheel base.

After adjusting the center distance between the front and rear rollers 6, 6 to the wheel base, the test vehicle is moved to the brake tester units 3, 4, and its wheels 5 are placed on the tire loading lift 8.

Thereafter, the lift 8 is lowered to place each wheel 5 on a pair of rollers 6, 6, and when the lift 8 has been lowered to a predetermined position, the driving means 10 for each roller 6 is driven.

The power of the drive means 10 is transmitted by the transmission means 12, 7
The rotation of the rollers 6, 6 causes the wheels 5 on the rollers 6, 6 to rotate.

Under such circumstances, when the driver of the test vehicle depresses the brake pedal, the braking force of each wheel 5 is input to the controller 17 via the braking force detection means 9. The controller 17 calculates the sum and difference of the braking force values of the front axle and the rear axle, compares the calculated value with a judgment value, and displays a judgment signal of pass/fail on the display plate 1.
output to the display lamp 19 of 8.

In other words, if the total braking force and the sum of the rear axle are both greater than or equal to the judgment value, and both the difference between the front axle and the difference between the rear axle are less than or equal to the judgment value, the pass indicator lamp 19 lights up, and if the above conditions are not met. , the rejection indicator lamp 19 lights up.

Next, when performing the ABS function determination, the driving force of the driving means 10 is adjusted via the torque control device 11 to an extent that overcomes the braking force described below, and under such a situation, the roller 6 is rotated. A uniform braking force is applied to each wheel 5 by rotating the wheels 5 and having the driver operate the brake pedal.

Therefore, in this case, the maximum braking force measurement
Since ABS function determination eliminates the trouble of relocating the wheel 5 on the roller 6, these measurements can be easily performed.

Under such conditions, the driving force of any wheel 5 or the drive means 10 for one axis, that is, the driving force of the roller 6
A signal is input to the controller 17 to reduce the transmission torque by the required amount.

In this way, the above signal is transmitted to the controller 1.
7 to a predetermined torque control device 11, which controls one or more drive means 1.
The driving force of 0 is adjusted downward. The adjusted driving force is then transmitted to a predetermined roller 6 via the transmission means 12 and 9, and since the driving force of the roller 6 is weak, the wheels 5 on the roller 6 rotate at a reduced speed.

If a given wheel 5 thus forms a locking precursor, such a situation will occur when the vehicle installed on the test vehicle
When the vehicle speed sensor (not shown) of the ABS control device detects that the wheel 5 is about to lock, a corrective action is immediately taken to weaken the braking force of the wheel 5.

Then, as the braking force is weakened, the rotational speed of the wheel 5 recovers, and if the ABS control device determines that it is not locked, a corrective action is performed to strengthen the braking force of the wheel 5.

This repetitive operation of braking force by the ABS control device is performed repeatedly at high speed during one braking operation as shown in Fig. 3, and the trajectory of this braking force value reaches the upper and lower reference limits f _U , f When passing _L , it is counted by a counter circuit built in the controller 17, and the number of times it passes n _U , n _L is the number of times it passes the reference number N _U , N _L
Pass/fail is determined based on the comparison, and the determination signal is output to the display lamp 19 of the display panel 18.

In this way, in the present invention, when braking the wheels 5, by reducing the driving force of a specific wheel 5, the wheel 5 is quickly decelerated, and the test vehicle side
This idea is to activate the ABS control device, and the idea is that when some wheels of a vehicle traveling at high speed are placed on a road surface with a low coefficient of friction and the brakes are applied, the This is based on the principle that the vehicle loses grip and decelerates rapidly, and is in line with the original function of an ABS control device.

Therefore, in the present invention, based on the specific wheel 5,
Since it is possible to judge the ABS function, it eliminates the problem of determining lock wheels based on heteronomous conditions as in the past, allows this type of judgment to be made precisely, and increases the reliability of the judgment results. It will be done.

Additionally, with the above configuration, the operation of the vehicle speed sensor that makes up the ABS control device, the valves inserted in the brake hydraulic circuit, etc. can be checked for each wheel, so even if the ABS control device malfunctions, However, by being able to identify the defective location and perform repairs and inspections accordingly, accurate and rational maintenance becomes possible.

(Effects of the Invention) As described above, since the brake tester of the present invention is provided with a roller having a high-friction peripheral surface on which a wheel can be placed, the brake tester of the present invention requires a roller having two types of friction coefficient parts on the peripheral surface. In comparison, this type of tester can be made smaller and lighter, and it is also possible to secure a wide space between the rollers arranged coaxially, making it possible to install, for example, a pit in the space, and use the pit to perform measurements. Can perform maintenance inspections on the underbody of the test vehicle.

Furthermore, since the present invention allows the torque of a predetermined roller to be lower than the torque of other rollers, it is possible to determine the ABS function based on a specific wheel, and this type of measurement can be performed precisely.
Since the ABS control device installed in the test vehicle can be checked for each individual vehicle, the failure location of the control device can be identified, and its repair inspection and maintenance can be carried out accurately and rationally.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is a block diagram showing the main parts of Figure 1, and Figure 3 is a block diagram showing the main parts of Figure 1.
FIG. 4 is a characteristic diagram showing the transition of the braking force when determining the ABS function, and is a block diagram showing the main part of another embodiment of the present invention. 3, 4... Brake tester unit, 5...
Wheels, 6... rollers, 9... braking force detection means,
10...Driving means, 17...Controller.

Claims (1)

[Claims] 1. A plurality of brake tester units each including a roller having a high-friction peripheral surface on which a wheel can be placed, a driving means capable of driving the roller, and a braking force detecting means capable of detecting the braking force of the roller; In a brake tester that has a controller that stores and calculates the signal input from the braking force detection means and determines whether the braking force is acceptable or not based on a pre-stored judgment value using this information as a condition, the torque of a predetermined roller is determined. A brake tester characterized in that the torque can be lowered than that of other rollers.