商用车电动助力转向系统助力特性研究

Study on the Characteristic of Electric Power Steering System of Commercial Vehicle

根据某商用车的结构、参数和试验数据,对商用车电动助力转向系统的布置、助力特性进行研究。设计方向盘转矩梯度曲线函数和速度梯度曲线函数,并确定电动助力转向系统的助力特性。运用TruckSim和Matlab/Simulink作为联合仿真平台,建立了装备电动助力转向系统的商用车联合仿真模型,对电动助力转向系统的助力特性以及对整车操纵稳定性的影响进行仿真研究,仿真分析表明所设计的助力特性可以有效提高商用车的转向轻便性和改善轨迹跟踪能力。

According to the structure, performance parameters and test data of a commercial vehicle, the arrangement and assist charac- teristic of electric power steering system is studied for commercial vehicle. On the basis of test data, the gradient curve functions of steer- ing wheel torque and velocity are designed, and the assist characteristics of electric power steering system is determined. Co-simulation model of the commercial vehicle equipped with electric power steering system is established on the simulation platform of TruckSim and Matlab/Simulink. The assist characteristics of electric power steering system and its influence of the vehicle steering stability is studied via co-simulation model. The co-simulation results show that the assist characteristics can enhances steering handiness and improves trajeeto- IT tracking ability of commercial vehicle effectively.