基于多MAP图的商用车电动助力转向控制策略  

Control strategy of electric power steering for commercial vehicle based on Multi-MAP

作　　者：李耀华[1] 何杰 范吉康 LI Yaohua;HE Jie;FAN Jikang(School of Automobile,Chang’an University,Xi’an 710064,China;Shanghai Automotive Industry Corporation Technical Center,Shanghai 201804,China)

机构地区：[1]长安大学汽车学院,西安710064 [2]上汽技术中心,上海201804

出　　处：《汽车安全与节能学报》2022年第1期86-94,共9页Journal of Automotive Safety and Energy

基　　金：国家自然科学基金资助项目(51207012);陕西省自然科学基金资助項目(2021JM-163)。

摘　　要：为解决前轴轻载荷和低路面附着因数工况下传统电动助力转向(EPS)降低驾驶员路感的问题,提出设计了基于多MAP图的EPS控制策略。该策略中,考虑了不同前轴载荷和路面附着因数对转向阻力矩的影响,采用反向传播(BP)神经网络计算不同工况下所需转向助力矩。通过Trucksim与Simulink联合仿真,验证评价了基于多MAP图的EPS控制策略。结果表明:基于多MAP图的EPS控制策略使车辆具有良好的转向轻便性,转向手力矩特性符合商用车理想转向盘转矩特性,可在轻载和低附着因数工况下增大转向盘转矩梯度,驾驶员中心转向区路感平均提升212%,改善了行驶安全性。An electric power steering(EPS)control strategy based on multi-MAP was proposed to decrease driver’s road feeling,and to solve the problem that traditional EPS gives too much assist torque under the conditions of a vehicle with light front axle load driving on the road with low adhesion coefficient.This control strategy considered front axle load and road adhesion coefficient based on the change of steering resistance torque under different front axle loads and adhesion coefficients.Determined steering resistance torque under different front axle load and adhesion coefficient by using the Back Propagation(BP)neutral network.This strategy was evaluated through the co-simulation of Trucksim and Simulink.The results show that the proposed EPS control strategy makes the vehicle have good steering portability,handling torque meet the ideal handling torque of commercial vehicle.The steering wheel torque gradient can be increased under light load and low adhesion factor conditions,and the road feel in the driver’s center steering area is increased by an average of 212%,improving driving safety.

关 键 词：电动助力转向(EPS) 驾驶员路感 路面附着因数 前轴载荷 多MAP图 商用车 

分 类 号：U463.21[机械工程—车辆工程]