电动助力转向系统的主动回正控制  

Active Return-to-center Control of an Electric Powered Steering System

作　　者：景立群[1] 季学武[1] 

机构地区：[1]清华大学汽车安全与节能国家重点实验室

出　　处：《汽车技术》2008年第9期9-12,共4页Automobile Technology

基　　金：国家"863"项目资助(项目编号:2006AA110101)

摘　　要：在EPS系统开发过程中发现,若不进行回正控制,安装EPS系统的汽车低速行驶时转向回正不足。通过对回正力矩的分析,探讨了安装EPS系统的汽车低速行驶时转向回正不足的原因。通过对助力及回正行程中转矩信号变化规律的研究提出,以回正前保舵状态时的转矩作为回正的特征参数,确定主动回正所需要的电机电流及持续时间;以转矩信号从非零向零的转变作为判断回正状态的条件。实车试验结果表明,本方法明显改善了EPS系统的转向回正性能。In the development process of EPS system,it was found that the vehicle installing an electric powered- steering system （EPS）without return-to-center control will not approach to neutral position automatically after steered when the car rides at low speeds.The reason for the steering wheel not returning to center was discussed based on the analysis for returning moments.Then the power and torque signal change pattern during returning travel was studied.An active returning method was proposed in this paper,in which the holding torque before returning was used as the returning characteristic parameter to determine the motor current and its duration time,and the change of torque signal from nonzero to zero was used as criteria to determine the ruturning state.Finally,the proposed active returning method was verified on the vehicle and it was found that the method improved EPS return ability obviously.

关 键 词：EPS 主动回正 特征参数 

分 类 号：U463.4[机械工程—车辆工程]