The Research And Simulation On Control Method Of Vehicle Electronic Stability Program

In recent years, the research on electronic stability program is the focus in vehicle active safety research field, which is developed after antilock braking system and traction control system. It not only contains all the functions of ABS and ASR, but also improves the vehicle stability in more critical conditions. With the development of technology and the reduction of cost, ESP system will be the standard equipment of the modern cars. While in china, the research in this field is at the very beginning, so this kind of research is of great significance to master our own intellectual property rights, and break the monopoly of foreign technology.Firstly, the paper considered the important influence of nonlinear characteristics of tire on cornering characteristics and driving stability of vehicle was considered at first. The nonlinear tire model (Magic Formula) was adopted, and the four wheels vehicle model with two degrees of freedom and vehicle reference model were set up on this basis.Secondly, through the research on the causes of vehicles'instability, the paper gained the main stability parameters of vehicles, then through the studying on the vehicle stability control system in theory, the side slip angle and yaw rate are chosen to be the main control variables, then the relation between them are analyzed deeply.Thirdly, the paper researched on vehicle stability control algorithms, adopting a control algorithms based on the yaw torque directly control of the vehicle stability, and in accordance with the two important parameters which is to describe automotive'movement status-the yaw rate and the side slip angle, respectively pushed out three targeted control strategy.Finally, through the establishment of the model, the study of vehicle non-stability reason, the choice of control parameter and the research of control method, the paper established MATLAB/SIMULINK simulation modules, through the step input, single-cycle sine input and multi-cycle sine input of the front-wheels, to simulate the side slip angle PID control, yaw rate PID and fuzzy PID control methods. And research shows that the three methods can well control the vehicle side slip angle and yaw rate, so as to improve the vehicle stability.