基于分数阶理论的汽车电动助力转向系统分析  

Analysis of Automotive Electric Power Steering System Based on Fractional Order Theory

作　　者：李剑英 吴林佳 Li Jianying;Wu Linjia(School of Mechanical and Automotive Engineering,Zhaoqing University,Zhaoqing 526061,Guangdong,China)

机构地区：[1]肇庆学院机械与汽车工程学院,广东肇庆526061

出　　处：《科技通报》2023年第5期63-68,共6页Bulletin of Science and Technology

基　　金：教育部协同育人项目(220603950174204);广东省大学生攀登计划项目(pdjh2022b0554);肇庆学院大学生创新创业训练项目(202210580009)。

摘　　要：本文在分析汽车电动助力转向(EPS)系统结构基础上建立其动力学模型,设计了直线型的助力特性曲线,以某款车型参数为例,搭建汽车EPS系统分数阶仿真模型,分别在PID控制和分数阶PIλDμ控制器下,车速为80 km/h时,向转向盘输入一个正弦波力矩,来判断转向盘转角、传感器力矩、回正电压、助力电流和助力电压相对于转向盘力矩输入时的系统响应。研究表明:相对于PID控制,转向盘转角、传感器力矩、回正电压、助力电流和助力电压在分数阶PI^(λ)D^(μ)控制器下,对转向盘力矩输入有更好的响应特性,控制效果更好。本文研究结果为设计效果更好的汽车EPS系统控制器提供指导。The dynamic model of the automotive electric power steering(EPS)system is established based on the analysis of the structure of the automobile electric power steering system,and the linear power assist characteristic curve is designed.Taking the parameters of a certain car model as an example,a fractional-order simulation model of the automotive EPS system is built,when the vehicle speed is 80 km/h,under the PID control and fractional-order PI^D"controller,a sine wave torque is input to the steering wheel to judge the steering wheel angle,sensor torque,back-to-positive voltage,assist current and assist voltage relative to the system response to the steering wheel torque input.The research shows that compared with the PID control,the steering wheel angle,sensor torque,back-to-positive voltage,assist current and assist voltage have better response characteristics to the steering wheel torque input under the fractional-order PI^(λ)D^(μ)controller,and the control effect is better.The researchresults provide guidance for designing better automotive EPS system controllers.

关 键 词：电动助力转向系统 分数阶控制器 转向盘力矩 助力电流 助力电压 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]