Yaw stability control for in-wheel-motored electric vehicle with a fuzzy PID method

In order to improve in-wheel-motored electric vehicle(EV) yaw stability, the yaw stability control system based on fuzzy PID controller is carried out in this paper. Firstly, we set up the original models for controller: a 2DOF EV dynamics model and wheels with in-wheel motors model. Secondly, a control system which includes three parts: reference model, upper yaw stability fuzzy PID controller and lower moment distribution controller is designed. Besides, under the help of lookup table, the problem that fuzzy toolbox can't be downloaded into dSPACE is solved. Finally, we run the off-line and real-time simulation on a 8 degrees of freedom(DOF) in-wheel-motored EV model with unitire tire model to verify the effectiveness of the fuzzy PID algorithm.