JPH04116746U - inertial brake tester - Google Patents

Abstract

(57) [Summary] [Purpose] In addition to the normal braking force test, to easily and accurately judge the ABS function of vehicles equipped with an anti-skid brake system (hereinafter referred to as ABS). [Structure] An inertial brake that is equipped with rollers 6 and 7 on which the wheels 5 of the test vehicle are placed and can apply an inertial load, and that applies braking to decelerate the rollers 6 and 7 when the vehicle is running at a predetermined speed. In the tester, drive motors 8 and 9 that can variably control the torque of each roller 6 and 7;
Speed detectors 10 and 11 capable of detecting the rotational speed of rollers 6 and 7, and a controller 14 capable of setting torque to the drive motors 8 and 9 to compensate for the insufficiency of mechanical inertia when the rollers 6 and 7 are decelerated are provided. When determining the ABS function, the torque of the drive motor 8, 9 corresponding to any roller 6, 7 is changed to that of the other drive motor 8, 9.
The ABS function of the vehicle is activated by temporarily lowering the wheel 5 compared to the vehicle speed and rapidly decelerating the wheel 5.
Let them judge whether the S function is good or bad.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

In addition to the normal maximum braking force test, this invention also tests the anti-skid brake system (hereinafter referred to as Easily and precisely determine the ABS function of vehicles equipped with ABS (hereinafter referred to as ABS). Regarding the inertial brake tester.

0002

[Conventional technology]

In recent years, many vehicles with ABS have been produced to improve driving stability during sudden braking. As a braking force testing device for the vehicle, a brake equipped with an ABS function determination device is used. A kit tester is required in the market. In view of these points, the applicant has developed a brake tester equipped with various ABS function determination devices. This was published as Utility Application No. 2-73388 and Japanese Patent Application No. 2-325339. I have already applied.

0003 By the way, in Japan's vehicle inspection system, the speed of the rollers is extremely low, so-called bending speed. The brake tester is used in automobile manufacturing factories in other countries and in Japan. uses an inertial brake tester to check braking performance during high-speed driving. may be used.

0004 This inertial brake tester applies an inertial load to the test vehicle while driving at high speed. This amount of inertia is decelerated by the vehicle's braking device, and depending on the deceleration situation, the vehicle It evaluates braking performance, and its basic structure is a machine that approximates the mass of the test vehicle. The mechanical inertia is compensated by a flywheel, etc., and the specified high speed is reached mainly by the power of the test vehicle. At the same time, during subsequent coasting, the vehicle is braked to decelerate the rollers, and at that time The braking ability of the test vehicle is evaluated from the deceleration, stopping distance, deceleration torque, etc. I'm doing it.

[0005]

[Problem that the idea aims to solve] Therefore, with this inertial brake tester, the vehicle is running at high speed as mentioned above. Since the braking test is based on the actual braking test, the ABS function is confirmed using the tester. If you attempt to do so, you must apply extremely sudden braking to lock up the tires. However, there is a problem with the safety and retention of the test vehicle at that time. There have been problems, such as the fact that it is structurally difficult to artificially select the wheels to be used.

[0006] In view of these points, this invention has been developed to improve the ABS function in an inertial brake tester. Sudden braking and artificial wheel locking are problems when checking operation. In addition to the normal maximum braking force test, the ABS function test To provide an inertial brake tester that allows easy and accurate judgment. aimed to.

[0007]

[Means to solve the problem]

For this reason, the inertial brake tester of the present invention is designed with the wheels of the test vehicle mounted on it. It is equipped with rollers that can apply a physical load, and when the vehicle is running at a predetermined speed, the vehicle is braked and rolled. The brake performance of the test vehicle is evaluated based on the deceleration status of the rollers. In the inertial brake tester, the amount of inertia of each roller was determined by the weight of each wheel of the test vehicle. At the same time, each roller drive torque can be variably controlled. A motor, a speed detector that can detect the rotational speed of each roller, and a speed detector that can detect the rotational speed of each roller, and a A controller that can set the reduced torque due to insufficient load to the drive motor. The torque of the drive motor corresponding to any roller can be transferred to other drive motors. By temporarily lowering the wheel speed compared to This kind of ABS function is activated and the quality of the ABS function is judged. Achieves ABS function judgment by a tester and allows this to be done safely This kind of It is characterized by being able to make judgments accurately and rationally.

[0008]

【Example】

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In FIGS. 1 to 3, 1 is A test space set up on the floor of an automobile repair shop, etc., with a vertically long pit 2 in the center. A front wheel brake tester unit 3, 3 is installed on both sides of the pit 2. And brake tester units 4, 4 for the rear wheels are installed.

[0009] The brake tester units 3, 4 are constructed in substantially the same way; The surface of the test vehicle (not shown) has a relatively large friction coefficient. The rollers 6 and 7 have a relatively large diameter on which the wheel 5 can be placed, and the test vehicle on the rollers 6 and 7 is used. Detects the rotational speed of the drive motors 8, 9 and rollers 6, 7 that apply the insufficient amount of load. and speed detectors 10 and 11 for inputting this to a controller to be described later. There is. In this case, although not shown in the figure, the rollers 6 and 7 are used to control the entry and exit of the wheels 5. An auxiliary roller fixing device and an appropriate device located near the roller to prevent the wheel 5 from jumping out. Appropriate means will be provided.

0010 The torque of the drive motors 8 and 9 is controlled by torque control devices 12 and 1 in the controller 14. It is controlled by 3. The controller 14 is, for example, a microcomputer. This computer has a mass setting device that sets the mass of the test vehicle. 15, and an acceleration calculation that calculates deceleration based on the input signals of speed detectors 10 and 11. Based on the input signals from the mass setting device 15 and the acceleration calculator 16, Calculate the inertial force of the test vehicle and calculate the drive torque of the rollers 6 and 7 corresponding to this inertial force. The torque control device 12,1 3 can be input.

[0011] In addition to this, the microcomputer also contains the model, wheel weight, and hardware of the test vehicle. Information such as the eel base and the number of passing times nU and nL, that is, one brake operation. It can be regarded as equivalent to the braking force exerted by the test vehicle, which varies from moment to moment depending on the vehicle. A calculation that multiplies the deceleration of rollers 6 and 7 by the amount of inertia including the electrical inertia compensation of each wheel. Calculated braking force (hereinafter referred to as calculated braking force) upper and lower reference values FU and FL can be input. , from the controller 14, drive motors 8, 9 and wheel base adjustment, which will be described later. It is possible to output ON/OFF signals to the motor.

0012 The above computer also records braking forces for the left and right wheels of the front and rear axles of the test vehicle. Judgment values for the sum and difference of calculated braking forces of rollers 6 and 7, which can be considered equivalent, and ABS function judgment. The upper and lower reference values FU and FL of the calculated braking force of rollers 6 and 7 at the specified time and the The number of passes NU and NL are stored.

[0013] Based on the input calculated braking force, the computer then controls the front and rear axles. Calculate the sum and difference of the calculated braking forces, compare the calculated value with the judgment value above, and then In addition to determining the pass/fail of the ABS function, the number of passes nU, Compare the size of nL with the number of times NU and NL of passing the standard, and judge whether the result is pass or fail. These determination signals can be output to the display lamp 19 of the display panel 18.

[0014] The rear wheel side brake tester units 4, 4 are installed on mounts 20, 20, The platforms 20, 20 extend along a pair of guide rails 21, 21 in the longitudinal direction of the test vehicle. It is movably installed, and a connecting block (not shown) is provided on its back surface. The screw shafts 22, 22 are screwed into the connection block, and the shafts are screwed together. One ends of the wheels 22, 22 are linked to wheel base adjustment motors 23, 23.

[0015] In addition, in the above-mentioned embodiment, the rollers 6 and 7 are used as means for evaluating the braking force of the test vehicle. Detects the deceleration of The braking performance of the test vehicle is evaluated using calculated braking force, but instead of this, the axle torque is It is possible to evaluate the deceleration torque by installing a torque meter, etc., or to evaluate the speed until the roller stops. Evaluation may be performed by measuring the distance traveled, or by accelerating the test vehicle to a specified high speed range. Regarding the method, in this embodiment, the rollers 6 and 7 are accelerated by the drive motors 8 and 9. However, acceleration may be performed by the driving force of the test vehicle itself.

[0016]

[Effect]

The inertial brake tester configured as described above was used to test the ABS of the test vehicle. When measuring the maximum braking force of a vehicle equipped with a vehicle, the specifications of the vehicle are registered in the controller 14. Record.

[0017] In this way, the controller 14 controls the type, weight, and wheelbase of the registered vehicle. Judgment values for the sum and difference of the calculated braking forces of the left and right rollers 6 and 7 of the front and rear axles, and A The upper and lower reference values FU and FL of the calculated braking force of the rollers 6 and 7 at the time of BS function judgment, Read out the number of times NU and NL of passing the standard.

[0018] The controller 14 controls the wheel base based on the wheel base signal. A drive signal is output to the motors 23, 23 for adjusting the speed, and the motors 23, 23 are driven. Ru. When the motors 23, 23 are driven, the power drives the screw shaft 22. Through this, the transmission is transmitted to the frames 20, 20 to which the connecting blocks constituting the screw mechanism are fixed. The frame 20, 20 moves along the guide rails 21, 21, and the wheel It stops at a predetermined position that matches the base.

[0019] After adjusting the center distance of the front and rear rollers 6 and 7 to the specified wheelbase, the test vehicle was When the wheel 5 is moved in the direction of the arrow in Fig. 1 and the wheel 5 is placed on the rollers 6 and 7. Then, the drive motors 8 and 9 are driven. Then, the rollers 6, 7 directly connected to the drive motors 8, 9 are rotated, and the rollers 6, 7 are rotated. The upper wheel 5 is rotated and further accelerated to reach a predetermined high speed range. to reproduce the coasting condition of the test vehicle.

[0020] Under these circumstances, when the driver of the test vehicle depresses the brake pedal, each The wheels 5 are braked and the rollers 6 and 7 are decelerated, and this is detected by the speed detectors 10 and 11. output and input to the controller 14. In this case, the deceleration of rollers 6 and 7 is proportional to the braking force, and the deceleration and inertia The characteristics of the calculated braking force, which is multiplied by I can do it. The controller 14 calculates the sum and difference of the calculated braking forces of the front axle and the rear axle, and It compares it with the judgment value and outputs the pass/fail judgment signal to the display lamp 19 of the display panel 18. Ru.

[0021] In other words, the sum of the calculated braking forces and the sum of the calculated braking forces of the rear axle are both greater than or equal to the judgment value, and the front If the difference between the left and right calculated braking forces of the axle and rear axle are both below the judgment value, the pass indicator lamp 1 will be displayed. 9 lights up, and if the above conditions are not met, the rejection indicator lamp 19 lights up.

[0022] During this time, the acceleration calculator 16 detects each roller based on the speed detection signal that is input every moment. The mass setting device 15 calculates the deceleration of The mass of each wheel is calculated from the mass data of the tested vehicle, and this is sent to the calculator 17. Output. Based on this information, the calculator 17 selects a roller that matches the mechanically insufficient amount of inertia. 6 and 7 are calculated and outputted to the torque control devices 12 and 13 to control each drive. By increasing the torque of motors 8 and 9, the amount of inertia that is insufficient for the vehicle is replaced electrically. be compensated.

[0023] Therefore, each roller 6, 7 will not be rapidly decelerated by the above-mentioned braking. , the driving conditions (braking effect) on the road are reproduced.

[0024] Next, when performing the ABS function judgment, the test vehicle's rollers 6 and 7 should be The wheels 5 are mounted on the vehicle and the rollers 6 and 7 are rotated at high speed to bring the test vehicle into a high-speed coasting state. After forming, the driver operates the brake pedal to apply uniform braking force to each wheel 5. Then, each roller 6, 7 and wheel 5 are rotated at a reduced speed.

[0025] Such a situation is detected by the speed detectors 10 and 11, and is further detected by the acceleration calculator 16. A control signal output from the calculator 17 to the torque controller 12 via the mass setting device 15 Based on the above, the torque of each drive motor 8, 9 is increased and the torque of each drive motor 8, 9 is increased and the torque is The amount of inertia caused by this is electrically compensated.

[0026] Under such circumstances, the torque of the drive motors 8 and 9 for any one wheel 5 or one shaft may be changed. A signal is input to the controller 14 to reduce the torque by the required amount. In this way, the signal is transmitted from the controller 14 to the predetermined torque control device 1. 2, and by means of the device 12 the torque of the drive motor or motors 8, 9 is The rollers 6 and 7 and the wheel 5 riding on them rapidly decelerate. do.

[0027] Therefore, the wheel 5 whose torque has been reduced locks more easily than other wheels 5. This situation is reflected in the vehicle speed sensor (as shown) of the ABS control device installed in the test vehicle. (omitted), and when the wheel 5 is about to lock, the wheel 5 is immediately controlled. Perform corrective action to weaken the power.

[0028] Then, as the braking force is weakened, the rotational speed of the wheel 5 is recovered, and AB When the S control device determines that it is not locked, the braking force of the wheels 5 is strengthened again. Perform corrective action.

[0029] The repeated operation of braking force by the ABS control device is as shown in Figure 3. The locus drawn by this braking force is the upper and lower limit reference values FU, FL. , the number of times it passes is counted by a counter built into the controller 14, and The number of passing points nU and nL are compared with the standard number of passing points NU and NL to determine pass/fail. The determination signal is output to the display lamp 19.

[0030] In this way, in the present invention, an inertia compensation means is used in an inertial brake tester. Instead of mechanical compensation means such as flywheels that were traditionally used as Since it uses electrical compensation means such as a motor, it is difficult to adjust its operation and compensation amount. Can be done easily and precisely.

[0031] Moreover, when determining the ABS function, some or most of the inertia that acts as a load is The load is borne by the drive motors 8 and 9, which are mechanical compensation means, and the test vehicle is braked. In this state, the driving force of the drive motors 8 and 9 corresponding to a predetermined wheel 5 is applied to the other wheels 5. Compared to this, it was temporarily lowered, so it was extremely difficult to lock the wheels. This eliminates the need to apply sudden braking or worry about maintaining the test vehicle's posture at that time. The safety of seed work can be ensured.

[0032] In addition, in the present invention, the driving force of a specific wheel 5 is reduced when braking the wheel 5. Therefore, the wheel 5 is decelerated quickly and the ABS control device of the test vehicle is activated. For example, this idea applies to parts of a vehicle traveling at high speed. When a wheel is placed on a road surface with a low coefficient of friction and brakes are applied, the amount of friction on the road surface increases. This utilizes the principle of rapid deceleration due to the loss of the It is in line with its original function.

[0033] Therefore, in the present invention, a specific wheel 5 is artificially selected to determine the ABS function. Since it can be done, the locking wheel was previously determined by heteronomous conditions. This problem can be resolved and this type of judgment can be made accurately and rationally.

[0034] By configuring as described above, the vehicle speed sensor that constitutes the ABS control device Is it possible to check the operation of valves inserted in the brake hydraulic circuit for each wheel? Therefore, even if the ABS control device malfunctions, the defective location can be identified and corrective measures can be taken. Accurate and rational vehicle maintenance is possible because we can perform appropriate repairs and inspections. Become.

[0035]

[Effect of the idea]

As described above, the inertial brake tester of this invention variably controls the torque of each roller. A drive motor that can be controlled, a speed detector that can detect the rotational speed of each roller, and a A controller that can set the torque for the inertial load deficit to the drive motor when decelerating the motor. Compared to other drive motors, the drive motor torque corresponding to any roller is The ABS function of the vehicle is temporarily lowered and the vehicle's ABS function is activated by rapidly decelerating the relevant wheel. This type of tester operates to determine whether the ABS function is good or bad. In addition to realizing the ABS function judgment based on the Moreover, this type of judgment can be refined by artificially selecting the wheels to lock. It has the effect of being able to be done secretly and rationally.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the main parts of the present invention.

FIG. 3 is a characteristic diagram showing changes in calculated braking force during ABS function determination.

[Explanation of symbols]

5 Wheels 6,7 roller 8,9 Drive motor 10,11 Speed detector 14 Controller

Claims (1)

[Scope of utility model registration request] Claim 1: A roller is provided on which the wheels of a test vehicle can be placed to apply an inertial load, and when the vehicle is running at a predetermined speed, braking is applied to decelerate the roller, and the braking performance of the test vehicle is determined based on the deceleration state of the roller. An inertial brake tester designed to evaluate and a controller that can be set to the drive motor to temporarily reduce the torque of the drive motor corresponding to any roller compared to other drive motors, rapidly decelerating the wheel concerned, thereby improving vehicle anti-skid. An inertial brake tester characterized in that it operates a brake system and determines whether the system is good or bad.