Dynamic Analysis And Research Of Electric Vehicle Brake System

The development of the automotive industry is gradually moving towards electrification,intellectualization,networking and sharing with the development of science and technology.The electrification is the integration and carrier of the following three parts,therefore,developing electric vehicle technology is related to the development prospect of modern automobile industry.In this paper,the braking system of electric vehicle is taken as the research object,The Matlab modeling software and the simulation algorithm are used to analyze the composition of the braking system,electric vehicle brake system process dynamics,independent system simulation,regenerative braking coordinated control strategy and brake system steering stability simulation etc.(1)Structural principle of braking system of electric vehicle.The composition,operation and control method of automobile anti-lock brake system(ABS)are introduced,and this paper focuses on the analysis of regenerative brake system of electric vehicle.(2)Dynamic analysis of braking process of electric vehicle.It mainly analyzes the resistance of the whole vehicle and the distribution of braking force of front and rear wheels.In order to ensure the stability of the service brake system,the front and rear wheels must be adjusted in the form of "dynamic curve" to ensure the safety and stability of driving.(3)The simulation analysis of independent system.The traditional mechanical braking system is modeled and simulated by using Matlab software.It is concluded that wheels are locked at 2.127 s.It is necessary to install ABS on the vehicle.The comparison between the vehicle ABS with fuzzy control model and the threshold control simulation model shows that the former is better through the simulation.(4)Research on coordinated control strategy of regenerative braking.The basic principles of designing and implementing a hydraulic brake control design are modifications to the traditional brake system,simple construction,performance reliability and working life.Due to the hysteresis of the traditional hydraulic brake system,the control signal must be sent in advance in order to obtain better results in the integrated control of the ABS.(5)The simulation study of braking system’s handling stability.The typical simulation tests of steering stability were carried out,including steady-state rotation test,steering wheel angle step input test,and steering wheel angle pulse input test.The steering stability of the independent brake and the combined brake vehicle are comprehensively compared to obtain the effect of the combined brake on the steering stability trough these tests.By analyzing the dynamics of the brake system of the electric vehicle,this paper provides a reliable simulation model,which is helpful for the innovation and development of the electric vehicle products,reducing the cost,shortening the development cycle and promoting the development of the electric vehicle.