Based on the traditional counter-roller test rig used to measure cars without anti-lock braking system, it is necessary to retrofit, in order to increase the rotation speed of the drum, directly connect the output shaft of the motor to the drum shaft, and set the wheel and wheel. It can be vertically lifted and lowered along the guiding device. When pressure is applied, the wheel is rotated by the wheel. After the measurement is completed, the spring is used to reset the wheel. Measurement parameters In the measurement device, the measurement parameters mainly include four parts: wheel speed v body speed v, braking torque, load W. According to ABS working principle, the purpose of ABS is to automatically adjust the brake braking force, so that the wheel slip rate S In the optimal range of 10% to fully utilize the peak adhesion coefficient of the road and improve the braking effect of the vehicle, therefore, the wheel slip ratio during automobile braking is an indispensable output parameter, but due to the slip rate S Can not be obtained directly, only through the wheel speed and body speed calculations. In order to obtain the ground braking force and the ground adhesion coefficient of the car, the braking torque of the braking state must be measured; in addition, the braking force detection technology requirements are judged by the percentage of the shaft braking force to the axle load, and the total mass is different. For cars, it is an objective standard. Therefore, the synchronous measurement of the vehicle load is indispensable. Use sensors and their arrangement. Although the speed sensor can use non-contact speed sensor for the body speed, but the cost is high and the technology is complicated, in order to reduce the cost of the test bench, in the allowable range of error, the speed of the main drum (motor output speed) is used to replace the body speed; The gantry only needs to measure the wheel speed. The wheel speed sensor adopts a magnetoelectric sensor. The sensor gear mounted on the wheel shaft rotates with the wheel shaft. The wheel speed sensor outputs the AC signal, and the input amplification circuit magnifies the AC signal into a rectangle. After shaping and sent to the operation circuit.
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