基于模糊控制的后轮独立驱动纯电动汽车驱动控制策略研究

Study on Driving Control Strategy for Rear-Wheel-Independent-Drive Electric Vehicles Based on Fuzzy Control

针对后轮独立驱动纯电动汽车,提出了驱动防滑和转矩协调协同作用的驱动控制策略。驱动防滑控制策略采用了基于路面最优滑转率识别和最优滑转率PI控制的技术方法,主要包括三部分:滑转率及路面附着系数的估计、基于模糊控制的最优滑转率估计及基于最优滑转率的PI控制器设计。转矩协调控制采用了基于理想横摆角速度的PI控制方法。并且搭建了基于CarSim和MATLAB/Simulink的电动汽车驱动控制仿真分析平台,在对接路面和对开路面两种工况下对设计的驱动控制系统进行了仿真分析。仿真结果表明,所设计的驱动控制系统在两种路面行驶时都能实现驱动防滑的控制功能,有效提高了后轮独立电驱动车辆的动力性及行驶稳定性。

For the rear-wheel-independent-drive electric vehicle, this paper proposes a drive control strategy of the interaction of acceleration slip regulationand torque coordinated. The acceleration slip regulation strategy employs a method based on the optimal slip ratio identification and optimal slip ratio PI control. This method consists of three parts： the estimation of slip ratio and longitudinal friction coefficient, the estimation of optimal slip ratio using fuzzycontrol and an PI controller design based on the optimal slip ratio. The torquecoordinated control adopts PI control based on the ideal yaw rate. An electricvehicle driving control simulation and analysis platform is established utilizingCarSim and MATALAB/Simulink software. We carry out simulations and analyses under bisect adhesion road and variational adhesion road for the designed driving control system. The simulation results show that the driving control system canachieve the control function of acceleration slip regulation when vehicle runs ontwo kinds of roads, and effectively improve the power and stability performances of rear- wheel-independent-drive vehicle.