Simulation Research Of Vehicle Electronic Stability Program Based On ADAMS And MATLAB

ESP--the vehicle electronic stability program is a rapid development of new type vehicle active safety system in recent years,is also a research focus and hot spot in the vehicle active safety field in last few years.The system is mainly used when the cars are driven during turning on the road with low adhesion coefficient or in high speed,the lateral force of the tire usually attained to the physical limit and the vehicle dynamic stability will be lost because of the exterior disturbance or cornering,which will greatly reduce the running safety.The ESP system can real-time monitoring and comprehensive control engine driving torque and wheel braking force to improve the vehicle steering stability.Avoid dangerous working conditions,such as oversteering and understeering,at the same time make cars running accordance with the driver's intentions.At first,This paper analyzes the various aspects factors which influence cornering characteristics and driving stability of vehicle.The MATLAB/simulink is applied to create two degrees of freedom and vehicle reference model which is used to compute the ideal yaw rate and the ideal vehicle slip angle in different steering angles and vehicle velocities.The basic method and principles of vehicle stability control were researched theoretically.Including the influence of slip characteristics of tire on vehicle stability,and the influence of vehicle speed,steering wheel angle and road surface state.The simulation experimental researches of vehicle handling and stability were carried out under limit condition with ADMAS/Car.Due to nonlinear and time-varying property of the ESP system,the fuzzy controller and the vehicle with robustness is selected.Based on the control theory of these two methods,the fuzzy controller and PID controller were designed in the MATLAB/simulink platform.Many kinds of limit situation researches were carried out with the two kinds of control methods.The results show that the vehicle with ESP has well performance,and the path trail performance becomes better than the vehicle without ESP,the yaw rate and the vehicle side slip angle are under control.Vehicle handling stability is improved greatly,and active safety performance have been greatly improved.Then complete the control strategy optimization,using self-tuning fuzzy-PI control method to complete optimization experiment,verify the results and prove the superiority of the new method.