Research On Control Strategy Of Differential-braking-based Vehicle Dynamics Stability

With the vehicle performance improving and the highway developing rapidly, the vehicle's speed has been greatly improved, coupled with the rapid increase in the number of vehicle, loss of lives and property caused by the traffic accidents is increasing. Vehicle safety, especially the active safety gains more and more attention, and become the focus on research and development of automotive company and majority scholars.In this paper, eight-degrees-of-freedom vehicle dynamic model and the two-degrees-of-freedom ideal reference vehicle model have been built. Study on the control strategy of vehicle lateral stability base on them. Using fuzzy control principle to direct at the nonlinear time-varying characteristics of vehicle stability control system, the fuzzy controller was designed, which can control combined the feedback of yaw rate and the heart of sideslip angle, making the difference between actual value and nominal value of vehicle yaw rate and sideslip angle in a certain range to keep the stability of vehicle. When the vehicle in the unstable state, adjusting braking power and generating yaw torque at the same time by the differential method to control the vehicle stability, and ultimately make the vehicle running in accordance with the intention of driver. Make Simulations on the model controls by the MATALAB/SIMULINK software and to verify the effectiveness of control algorithm. Designed of vehicle dynamics stability control hardware-in-the-loop test bed, and carried out related experimental verification based on dSPACE.The results show that the proposed control strategy can more effectively control the vehicle yaw rate and sideslip angle, enhancing the vehicle stability.