电动液压助力转向系统的节能优化研究  

Study on Energy Saving Optimization of Electric Hydraulic Power Steering System

作　　者：夏雨 张涌 吴海啸 姜朋昌 XIA Yu;ZHANG Yong;WU Haixiao;JIANG Pengchang(College of Automobile and Traffic Engineering,Nanjing Forestry University,Nanjing 210037)

机构地区：[1]南京林业大学汽车与交通工程学院,南京210037

出　　处：《森林工程》2019年第3期93-99,120,共8页Forest Engineering

基　　金：国家自然科学基金资助项目(51375007)

摘　　要：针对某型纯电动商用汽车的EHPS,在传统常流式EHPS基础上提出一种新型的常压式EHPS系统。这种系统在传统常流式EHPS系统的基础上加装了蓄能器和电磁阀等结构,取代了电机和液压泵的持续工作状态,使系统既能满足转向助力的需求,又能减轻能量的耗损,实现系统的节能优化。根据系统性能对其关键部件进行合理的选型和计算;基于助力需求选择合适的助力特性曲线形式,并在MATLAB曲线拟合工具箱中进行基于车速系数的助力特性的曲线拟合;根据助力特性确立系统控制的方法;在MATLAB/simulink软件中对常压式EHPS进行建模,对系统的助力响应、控制性能和助力跟随性进行仿真分析,并对能耗进行计算。仿真得到的结果表明,这种常压式EHPS能够达到转向助力性和节能性的双重要求。For EHPS of a pure electric commercial vehicle, a constant pressure type EHPS has been proposed based on the constant flow type EHPS. This system has been installed an accumulator and solenoid valve on the basis of the traditional constant flow type EHPS, which replaces the continuous working state of the motor and hydraulic pump. This system can not only meet the needs of steering power, but also reduce energy consumption and realize energy-saving optimization of the system. According to the system performance, the key components have been selected and calculated reasonably;choose the appropriate assist characteristic curve form based on the assist demand, and perform curve fitting of assist characteristic based on the vehicle speed coefficient in MATLAB curve fitting toolbox;the method of system control has been established according to the assist characteristic;the constant pressure type EHPS has been modeled in MATLAB/simulink software, and the system’s assist response, control performance and power-following performance have been simulated and analyzed, and the energy consumption has also been calculated. The simulation results show that the constant pressure type EHPS can meet the dual requirements of steering assist and energy saving.

关 键 词：常压式EHPS 助力特性 建模与仿真 

分 类 号：U463.4[机械工程—车辆工程]