电液比例阀旁通流量式ECHPS系统设计与试验  

Design and Test of by-pass Flow Type ECHPS Based on Electro-hydraulic Proportional Valve

作　　者：唐斌[1] 江浩斌[2] 宋海兵 王春宏 

机构地区：[1]江苏大学汽车工程研究院,江苏泰州225300 [2]江苏大学汽车与交通工程学院,江苏镇江212013 [3]江苏罡阳转向系统有限公司,江苏泰州225300

出　　处：《河南科技大学学报（自然科学版）》2017年第5期25-31,共7页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(51275211);中国博士后科学基金项目(2016M590417);江苏省科技成果转化专项基金项目(BA2015168);江苏省高校自然科学基金项目(16KJB580001);江苏大学高级人才科研启动基金项目(15JDG093)

摘　　要：针对液压助力转向(HPS)系统无法兼顾低速转向轻便性和高速转向路感的问题,提出了电液比例阀旁通流量式电控液压助力转向(ECHPS)系统。通过试验获得了驾驶员偏好的方向盘转矩,通过仿真得到了典型车速下的等效转向阻力矩。以典型车速和转向盘转矩下的助力油压与特征点助力油压的残差平方和最小为目标函数,对转向系统参数进行了优化,设计了基于驾驶员偏好转矩的随速可变助力特性。通过台架试验验证了可变助力特性设计方法的正确性,制定了基于自适应模糊滑模控制的控制策略,进行了双纽线和高速中间位置小转角转向道路试验。道路试验结果表明:与装备HPS系统的车辆相比,装备ECHPS系统的车辆低速转向轻便性提高了35.3%,高速转向路感提高了52.2%。In order to solve the problem that hydraulic power steering( HPS) system cannot keep balance between low-speed steering portability and high-speed steering road feel,the electronically controlled hydraulic power steering( ECHPS) system with electro-hydraulic proportional valve of by-pass flow type was proposed.The driver preferred steering torque was obtained by experiment,and the equivalent steering resistance moment was achieved by simulation. The steering system parameters were optimized with the minimum quadratic sum of the difference between assist oil pressure at typical speeds and characterized assist oil pressure as objective function. The variable assist characteristics of ECHPS system were established. The design method of variable assist characteristics was verified by bench test. Then the control strategy of ECHPS system based on adaptive fuzzy sliding mode control theory was developed. The road tests of lemniscate steering and high-speed central steering with small angle were carried out. The results show that low-speed steering portability of the vehicle equipped with ECHPS system increases by 35. 3% and high-speed steering road feel increases by 52. 2%compared with HPS system.

关 键 词：电控液压助力转向 电液比例阀 可变助力特性 自适应模糊滑模控制 

分 类 号：U463.4[机械工程—车辆工程]