EV SBW system structure and SBW steady-state gain for the ideal steering ratio based on two freedom degree vehicle dynamics model were established;and SBW system mathematical model and the active steering con-trol strategy were built in MATLAB/Simulink.In the active steering controll, the hub steering drive motor angle was controlled by the ideal steering ratio and dynamic fuzzy sliding mode variable structure stability control algo -rithm.The results of the sine-input simulation showed that the algorithm based on the ideal steering ratio can meet the requirements of vehicle front wheel angle real-time compensation so as to effectively improve vehicle driving sta-bility.%对电动汽车的线控转向系统结构和基于两自由度的车辆动力学模型对线控转向稳态增益不变的理想转向传动比进行了设计;同时,利用MATLAB/Simulink建立线控转向系统数学模型和主动转向控制策略.在主动转向控制中,通过理想转向传动比和模糊滑模变结构动态稳定性主动控制算法,控制补偿轮边转向电机的转角.通过正弦输入的仿真试验表明,以理想转向传动比为基础,设计的此算法能满足车辆前轮转角实时补偿的需求,进而可有效提高了汽车的行驶稳定性.
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