电动汽车EPS助力曲线设计与评价研究

Study on Design and Evaluation of Assisted Characteristics Curve for EPS

对电动汽车助力转向特性进行分析,研究不同车速下驾驶员理想转向盘力矩随方向盘转角、侧向加速度变化的规律。以驾驶员理想转向盘力矩为依据,拟合出高、低速范围内理想转向盘力矩,并分析了低速范围内理想转向盘力矩模型参数及其影响因素。提出了符合转向特性的助力函数形式,设计了电动汽车的助力特性曲线,并阐述了设计原理及过程。在ADAMS/CAR中建立的整车模型与Matlab进行联合仿真。试验结果表明:所设计的助力曲线更符合转向特性的要求。

We analyzed the assist characteristic of electric power steering of the vehicle. Under different speeds,the ideal steering wheel torque of driver was changed with the steering wheel angle and lateral acceleration. We studied the ideal steering wheel torque model and established the ideal steering wheel torque models in high and low speed range. The ideal steering wheel torque model parameters in low speed range and its influence factors were analyzed. The vehicle model was built by ADAMS / CAR and Matlab,and the speed responding assist characteristic curve of passenger car was drawn up,and then the process assisted characteristic curve of electric power steering system was formed. The result showed that the assist curve meets the requirements of the automobile steering characteristic.