Design and implementation of bicycle disc braking distance test system

CHEN Meng-qun，YANG Cheng-zhong
（School of Automation，Hangzhou Dianzi University，Hangzhou 310018，China）

Abstract：As the bicycle disc brake is getting more and more popular，the reliability testing is very important. But in the domestic market，there is no test system for the disc brake. Aiming at this problem，a system was designed to test the braking distance of the bicycle disc brake. The bicycle simulator was firstly created to simulate bicycle braking. Then a tension sensor and a speed sensor were installed on the braking simulator. The tension sensor was used to indirectly measure the power of gripping on the handlebar when the bicycle simulator was braking. The speed sensor was used to measure the speed of the inertial disc throughout the braking process. The signals of the two sensors were collected by the data acquisition card. The data of the sensors from the data acquisition card was gotten and analyzed，the commands were sent to control of the braking process， the data was real-time displayed，including tension value，velocity，the braking distance and so on. The braking distance of a bicycle disc brake was determined by the average of multiple test results. Finally the verification experiment was done in a factory producing Bicycle disc brakes. The results indicate that the system can accurately measure the bike's braking distance，and be stable to perform，easy to operate and practical. This set of test system for the bicycle disc brake has good application value.
Key words：bicycle disc brake；braking simulator；inertial disc；braking distance