基于模糊非线性状态误差反馈策略的EPS回正控制  

EPS return control based on fuzzy NLSEF control method

作　　者：陈久闪 赵林峰[1] 祖春胜 

机构地区：[1]合肥工业大学汽车与交通工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2017年第5期595-600,共6页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省自然科学基金资助项目(2013AKZR0077);安徽省自然科学基金青年资助项目(1508085QE92);中央高校基本科研业务费专项资金资助项目(JZ2014HGBZ0374)

摘　　要：为了解决电动助力转向(electric power steering,EPS)系统回正控制中快速性与准确性之间的矛盾,提升回正控制的稳定性,文章针对PID控制中积分环节的不利影响及滑模变结构控制(sliding mode control,SMC)较为依赖精确数学模型的问题,采用了非线性状态误差反馈(nonlinear state error feedback,NLSEF)的EPS回正控制策略;对NLSEF的参数采用模糊化控制调节,以转向盘的转角及角速度作为输入变量,建立回正控制策略模型。台架试验结果对比表明,参数模糊化控制的NLSEF方案明显改善了EPS的回正性能,同一车速条件下,不论转向盘初始状态如何,都能快速、准确地操纵汽车回正。In order to enhance the return stability of electric power steering（EPS） system, and resolve the contradiction between the rapidity and accuracy during the return control, the fuzzy nonlinear state error feedback（NLSEF） control is proposed to eliminate the negative effect of the integral link in PID control and solve the problem that sliding mode control （SMC） is more dependent on the exact mathematical model. The NLSEF parameters are adjusted by fuzzy control. Taking the steering wheel angle and angular velocity as the input variables, the return control strategy model is established. The bench test results show that the proposed control strategy can improve the return performance of EPS. At the same vehicle velocity, the return control system can quickly and accurately control the steering wheel back to the mid-position no matter what the initial steering wheel angle is.

关 键 词：电动助力转向(EPS) 回正 非线性状态误差反馈(NLSEF) 模糊控制 

分 类 号：U463.4[机械工程—车辆工程]