Study On Vehicle Stability Control Strategy

When the vehicle is at a high speed or the road adhesion coefficient of the road is relatively small,such as some of the limit conditions for steering,due to the effect of external interference or diversion,the turning radius becomes larger or smaller,therefore,the vehicle is prone to instability,which can cause traffic accidents.The Electronic Stability Program is new generation vehicle active safety system,it can adjust the running state of the vehicle in real time,so as to improve the stability of vehicle driving.In this paper,the principle of vehicle stability control is analyzed,detailed characterization of yaw rate and sideslip angle of the vehicle stability.The ideal two degree of freedom model of vehicle is established by using Matlab/Simulink,The control idea of direct yaw moment by DYC(Direct Yaw Control),based on fuzzy control theory,design of yaw rate fuzzy PID controller and sideslip angle fuzzy PID controller,the weighted design of the yaw moment is also designed.The calculation of compensating yaw moment is deduced,according to the difference between the front wheel angle and the actual yaw rate and the expected yaw rate,the driving state of the vehicle is determined,the control strategy of braking force distribution is developed,by means of differential braking,single wheel braking is used to distribute the braking force.Combined with software CarSim and Matlab/Simulink,choose the double lane change and serpentine two test conditions for the co simulation,the simulation results are compared and analyzed,the results show that the control strategy can effectively improve the stability of the vehicle.In order to verify the validity of the control strategy,based on the driving simulator platform,and the double lane change and serpentine two conditions for the control and no control of the hardware in the loop experiment,the experimental results verify the effectiveness of the proposed control strategy.