Analysis And Simulation Of The Braking Performance For Electromagnetic Brake Of City Bus

City bus is not only the main body of city public transportation, but also an important part of city life. With the improvement of standard of living, people's demands for city bus are increasing continuously. When the city bus runs, there is a common problem for city bus without sufficient brake power which is caused by large number of passengers and frequently braking. The application of electromagnetic brake can not only solve this problem effectively, but also improve security, environment protection, comfort and cost-effectiveness of city bus to meet passengers' demands. Therefore, according to the characteristics of city bus, it is necessary to study the special function and the braking performance of electromagnetic brake of city bus to make electromagnetic brake more suitable for the request of city bus development.Firstly, the dissertation synthetically discussed the fundamental problems of electromagnetic brake of city bus, such as working principle, basic structure and installation modes. According to the working condition and developing trend of city bus, the dissertation proposed the function and design requirements for the electromagnetic brake of city bus, and then focused on introducing a type of electromagnetic brake of city bus DHZ100, which is designed by the work-team, and its application effect. The dissertation deducted the formula for calculating braking torque and temperature-rise of electromagnetic brake of city bus, and by analyzing the braking process of city bus with electromagnetic brake, the dissertation also obtained the formula for calculating the braking performance indexes—braking distance, braking deceleration and braking time. By establishing the bond graph of city bus's power transmission and using the Matlab/Simulink based on the bond graph, this dissertation established the simulation model of braking performance of electromagnetic brake. Through simulating the braking performance of DHZ100, the influence of this brake on city bus had been obtained. And through comparing the simulation results of the braking performance of city bus equipped with electromagnetic brake with city bus not equipped with electromagnetic brake, it was proved that the theoretical analysis of braking performance was correct, and proposed a simple and feasible method for optimized design and matching design of electromagnetic brake of city bus.The main contributions in this dissertation have been applied in the design of electromagnetic brake on city bus, and have been proved to be practical and correct by experiments.