基于路面附着系数的电动助力转向控制研究  

Research on the Control of Electric Power Steering System Based on Road Adhesion Coefficient

作　　者：曹艳玲[1] 李鹏帅 CAO Yan-ling LI Peng-shuai(College of Vehicle and Traffic Engineering, Henan University of Science and Technology, Henan Luoyang 471003, China)

机构地区：[1]河南科技大学车辆与交通工程学院,河南洛阳471003

出　　处：《机械设计与制造》2017年第7期91-94,共4页Machinery Design & Manufacture

基　　金：河南省科技计划基金项目(144100510004)

摘　　要：为了解决路面附着系数变化对驾驶员路感的影响问题,基于路面附着系数对电动助力转向(EPS)系统的助力特性曲线进行了设计。在建立了整车和EPS系统的动力学模型基础上,结合最大回正力矩的估计方法对路面附着系数进行了推理和辨识,并据此,基于Matlab/Simulink平台对EPS的整体模型进行0.3g侧向加速度下的阶跃仿真,结合驾驶员理想方向盘转矩拟合得到随附着系数和车速变化的助力特性曲线。仿真结果表明,路面附着系数能被较好的估计,所设计的EPS助力特性曲线在高、低附着系数的路面上都能够满足驾驶员理想方向盘转矩要求,同时,低附着系数路面的驾驶员路感显著增加,能够提醒驾驶员注意行车的操纵安全。In order to solve the problem that the change of influences the driver＇s road feeling, this paper designs a power characteristic curve of the electric power steering （EPS） system based on road adhesion coefficient With the dynamics models of the vehicle and EPS system are established, this paper reasons and estimates the road adhesion coefficient combining with the method to estimate the maximum aligning torque, moreover, makes a step simulation about the whole models of EPS under 0.3g lateral acceleration based on Matlab/Simulink platform, and conducts the fitting of power characteristics curve which changes along with road adhesion coefficient and speed baesd on the driver＇s ideal handwheel torques. The simulation results show that the road adhesion coefficient can be well estimated , and the power characteristics curve designed meets the requirement of the driver＇s ideal handwheel torques on the high and low adhesion coefficient road, meanwhile, A significant increase of the driver＇s road feeling on low adhesion coefficient road can remind the driver to pay attention to the manipulation safety of driving.

关 键 词：路面附着系数 驾驶员路感 电动助力转向 回正力矩 助力特性曲线 

分 类 号：TH16[机械工程—机械制造及自动化] U463.4[机械工程—车辆工程]