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研究了汽车电动液压助力转向系统(简称EHPS)的结构组成和工作原理。通过建立系统的状态空间方程,搭建了系统的Simulink仿真模型。对系统中转速电流双闭环控制直流电动机的响应特性、跟随特性和抗负载干扰特性进行了仿真分析,分析结果为电动机的选择与匹配提供了理论指导。对液压泵排量、扭杆刚度和活塞的工作面积对系统工作性能的影响进行了仿真分析,分析结果为EHPS的性能分析和优化设计提供了理论依据。
The structure and working principle of the car electric hydraulic power steering system (referred to as EHPS) are studied. By establishing the state space equation of the system, a Simulink simulation model of the system is established. The response characteristics, following characteristics and anti-load disturbance characteristics of the double closed-loop DC motor with speed-current control in the system are simulated and analyzed. The results provide theoretical guidance for the selection and matching of the motor. The effects of hydraulic displacement, torsion bar stiffness and working area of piston on system performance are simulated and analyzed. The results provide theoretical basis for the performance analysis and optimal design of EHPS.