基于转角的商用车电动助力转向回正控制研究

摘要

To improve the return-to-center characteristics of the commercial vehicle electric power steering system, a target current controller was developed based on angle. The sensor LH3 was adopted to get the angle as the controller＇s input signal. The PID control method was used to get the target current, through controlling the power motor action, which could make the steering wheel fast return. Finally, the controller＇s simulation model has been built with the use of the simulink software to analyze the return-to-center properties. The results show that the back time of the steering wheel is shortened greatly, and the control method significantly enhances the EPS system return-to-center performance.%以改善商用车电动助力转向系统的回正特性为目标，开发了一种基于转向盘转角的回正目标电流控制器．该控制器以转角传感器LH3获取的转角信号为输入，经PID控制方式荻取回正目标电流，通过控制助力电机动作．使转向盘准确快速回位。并利用Simulink仿真软件搭建了该回正控制器仿真模型，对回正特性进行分析。仿真结果表明：转向盘的回正稳定时间大大缩短，该回正控制器明显提高了EPS系统的回正性能。