The friction coefficient of the sand-sticking roller is similar to the real road surface, which can simulate the actual braking situation of the car, increase the speed of the car and then brake, detect the braking force of the left and right wheels on the same car, and evaluate the car through calculation The braking performance of the car, the braking efficiency and stability data of the car during braking are given. The reaction roller brake test bench puts the front and rear wheels of the tested car on two rollers respectively. The two rollers rotate in the same direction under the drive of a motor and drive the wheels to rotate. At this time, the rolling of the wheels can be measured. resistance. When the brake air pressure of the tested car is greater than one atmosphere, the motor drives the wheels to rotate at the equivalent speed, and the tested car will brake. At this time, the wheel gives the roller a force that is opposite to the driving direction of the roller, that is, the braking force. This force causes the entire brake device to rotate with the roller as the axis and is balanced by the balance device to be relatively stationary. The balance is suspended on the base of the test bench and The change amount of the stretching sensor at the free end of the drum gearbox is reflected, and the change amount is converted into an analog electric signal and transmitted to the secondary instrument panel controlled by the single-chip microcomputer. After the conversion, the braking force value is displayed on the instrument panel panel. The working time of each braking is seconds. Once the wheels are completely locked, raise the brake pedal, otherwise the wheels of the car may be excessively worn. In the fully automatic automobile detection system, while the secondary instrument panel outputs the braking force value, the single-chip microcomputer transmits the digital signal generated by the converter to the main control computer system. The main control microcomputer substitutes it into the international market together with the pre-measured vehicle front and rear axle weight values.
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