Based on the traditional counter-force roller test bench used to measure cars without anti-lock brake system, it is modified. In order to increase the speed of the roller, the output shaft of the motor is directly connected to the roller shaft, and at the same time, the supporting wheel and the supporting wheel are set. It can be raised and lowered vertically along the guiding device. When pressed, the supporting wheel is driven to rotate by the wheel. After the measurement is completed, the restoring of the supporting wheel is realized by a spring.
Measuring parameters In this measuring device, measuring parameters mainly include four parts: wheel speed v body speed v, braking torque, load W. According to the working principle of ABS, the purpose of ABS is to automatically adjust the braking force of the brake to make the wheel slip rate S It is within the optimal range of 10% to make full use of the peak adhesion coefficient of the road surface and improve the braking effect of the car. Therefore, the wheel slip rate when the car is braking is an indispensable output parameter, but due to the slip rate S It cannot be obtained directly, but can only be obtained by calculating wheel speed and vehicle body speed. In order to obtain the ground braking force and ground adhesion coefficient of the car intuitively, the braking torque of the braking state must be measured; in addition, because the braking force detection technical requirements are based on the percentage of the axle braking force to the axle load, the total mass is different. It is a relatively objective standard for the automobile, therefore, the synchronous measurement of the automobile load is essential.
Adopt the sensor and its arrangement. Although the speed sensor can use a non-contact speed sensor for the body speed, it is costly and technically complicated. In order to reduce the cost of the test bench, the main drum linear speed (motor output speed) is used to approximately replace the body speed within the allowable range of error; The bench 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, and the wheel speed sensor outputs an AC signal. The input amplifier circuit amplifies the AC signal into a rectangle. And send it to the arithmetic circuit after shaping. For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.
Link to this article：The foundation of the anti-force roller test bench of the automobile is modified
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