首先对电动助力转向系统(EPS)进行了建模、分析及合理的简化。根据该系统特性,选择基于H∞的控制方法。在对S/T奇异值曲线的深入观察和研究的基础上,提出一种根据系统频域关键参数先构造闭环函数然后反推出系统控制器的方法。EPS系统频谱分析及干扰和模型参数摄动下的仿真结果表明,该方法设计的控制器简单有效,具有很好的鲁棒稳定性和鲁棒性能。 First, the electric power steering system (EPS) was modeled, analyzed and reasonably simplified. According to the characteristics of the system, choose H∞-based control method. Based on the in-depth observation and research on S / T singular value curve, a method of constructing closed-loop function based on the key parameters in the frequency domain and then deducing the system controller is proposed. Simulation results show that the proposed controller is simple and effective, has good robust stability and robustness.