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基于UIO的EPS系统状态反馈最优控制

DOI: 10.3724/SP.J.1004.2014.01433, PP. 1433-1441

Keywords: 电动助力转向,未知输入观测器,状态反馈,阻力距,助力-回正特性

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Abstract:

?准确地获知电动助力转向(Electricpoweringsteering,EPS)系统阻力矩是提高行车安全的一个重要因素.针对车辆转向过程中,由不同附着路面上EPS系统所需辅助力矩与转向路感之间的差别而可能导致的误操纵问题,本文基于2自由度整车动力学的EPS系统模型,结合轮胎特性,以轮胎侧偏角和理想路面附着系数为输入,通过设计非线性观测器估计当前路面的附着系数,以获取EPS系统阻力矩;进而,根据EPS系统模型,运用未知输入观测器(Unknowninputobserver,UIO)估算方向盘输入转矩,并基于EPS系统状态反馈以实现对EPS系统的无传感器最优控制.最后,对基于永磁同步电机(Permanentmagnetsynchronousmotor,PMSM)的EPS系统进行仿真实验分析.结果表明:在以电机q轴电流闭环误差最小为指标函数情形下,本设计的方向盘回正残留角从25°降到0°,能有效抑制系统外界干扰,提高了转向时人-车系统的鲁棒性.

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