电动助力转向系统回正控制研究

根据转向系统的回正特性，针对现有的电动助力转向系统模型在回正控制中的不足，提出了新的回正控制算法。借助专家控制器，实现了不同转向状态下控制策略的变换，即将常规助力控制和回正控制算法结合，采用控制器的辨识算法和监督算法构成闭环系统，使转向行程判断准确，实时性好。在此基础上，设计了新型的试验台架，可以更好地模拟车轮转向过程。结果表明，采用该回正控制策略能获得较好的回正性能，同时提高了转向系统的稳定性。

Study on Return-to-center Control of Electric Power Steering System

According to the return-to-center characteristics of a steering system and the deficiencies of an electric steering system model in the process of return-to-center, a new return-to-center control scheme was put forward. By dint of an expert controller, a control scheme that can convert in different steering state was realized. Based on above analysis, a new pattern of test- bed was designed, which could simulate the process of steering better. The results show that this control scheme can obtain excellent return-to-center performance and improve the stability of steering system.