【摘要】 为改善轮毂驱动电动汽车的转向轻便性,提出了一种基于变论域模糊比例-积分-微分(PID)的差动助力转向控制方法。建立转向系统模型和理想助力特性模型,获得车辆转向行驶过程中的理想方向盘力矩;根据方向盘力矩偏差和偏差变化率的大小,调整PID的3个控制参数,实现4个车轮的转矩分配控制;利用PID对车轮的滑移率进行控制,以避免车轮过度滑转;基于CarSim和MATLAB/Simulink软件的数字仿真进行了控制性能分析。结果表明:变论域模糊PID控制下车辆转向轻便性改善43.5%,横摆角速度误差均方根值为0.212 rad/s;该方法能提高方向盘力矩跟踪理想力矩的精度,且有效地实现了车轮滑移率控制。更多还原

【Abstract】 A differential power steering control method was proposed based on variable universe fuzzy proportional-integral-derivative(PID) to improve the steering lightness of an in-wheel-motored electric vehicle.A steering system model and an ideal power assist characteristic model were established to obtain the ideal steering wheel torque during vehicle steering. According to the deviation of steering wheel torque and the change rate of the deviation, the PID control parameters were adjusted and the torque distribution control of the four wheels were realized. PID was used to control the slip rate of the wheels to avoid excessive wheel slip. Numerical simulation based on CarSim and MATLAB/Simulink software was used to analyze the control performance. The results show that the vehicle steering lightness improvement under variable-domain fuzzy PID control is 43.5%, and the error rms of the yaw rate is 0.212 rad/s. The proposed control method can improve the accuracy of steering wheel torque tracking ideal torque, and effectively realize the wheel slip rate control.更多还原