汽车工程 ›› 2021, Vol. 43 ›› Issue (6): 899-908.doi: 10.19562/j.chinasae.qcgc.2021.06.014

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商用车电液耦合转向系统主动回正控制研究

耿国庆1(),李浩1,江浩斌1,陈杰2,唐斌1   

  1. 1.江苏大学汽车与交通工程学院,镇江 212013
    2.江苏罡阳转向系统有限公司,泰州 225318
  • 收稿日期:2020-11-20 修回日期:2021-01-10 出版日期:2021-06-25 发布日期:2021-06-29
  • 通讯作者: 耿国庆 E-mail:ggq@ujs.edu.cn
  • 基金资助:
    国家自然科学基金(51675235);泰州市重大科技成果转化项目(Grant SCG201904)

Research on Active Returnability Control for Electro⁃hydraulic Coupling Steering System of Commercial Vehicles

Guoqing Geng1(),Hao Li1,Haobin Jiang1,Jie Chen2,Bin Tang1   

  1. 1.Department of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212000
    2.Jiangsu Gangyang Steering System Co. ,Ltd. ,Taizhou 225318
  • Received:2020-11-20 Revised:2021-01-10 Online:2021-06-25 Published:2021-06-29
  • Contact: Guoqing Geng E-mail:ggq@ujs.edu.cn

摘要:

针对装有传统液压助力转向系统的商用车在回正过程中存在低速回正不足或高速回正过度的问题,综合考虑载荷转移、路面条件和轮胎非线性等对回正工况的影响,基于电液耦合转向系统,设计一种车辆质心侧偏角和横摆角速度联合控制的非线性滑模控制器。针对控制算法部分状态量难以获取和影响车辆回正稳定性的路面附着系数难以直接测量的问题,利用UKF观测器为滑模控制器动态估计车辆状态信息和路面附着系数,并将质心侧偏角的观测值和横摆角速度与其期望值之差作为控制系统输入,来求取回正控制所需的转角修正量。最后通过TruckSim、Matlab/Simulink和转向试验台架对不同工况下的转向回正性能进行仿真和台架试验,结果表明,所提出的主动回正控制策略可有效提高转向盘回正的稳定性和控制精准性。

关键词: 商用车, 电液耦合转向系统, UKF观测器, 滑模控制

Abstract:

Aiming at the problem of under?return at low speed and over?return at high speed of commercial vehicle with traditional hydraulically assisted steering system, a nonlinear sliding mode controller with associated control of vehicle’s mass?center sideslip angle and yaw rate is designed based on electro?hydraulic coupling steering system, with concurrent consideration of the effects of load transfer, road condition and tire’s nonlinearity on returnability. In view of the difficulties in obtaining some state variables of control algorithm and directly measuring road adhesive coefficient, which affects the return stability of steering wheel, the unscented Kalman filter observer is utilized as sliding mode controller to dynamically estimate vehicle state information and road adhesive coefficient, and the differences between the observed value and the desired value of mass?center sideslip angle and yaw rate are taken as the input of the control system to find out the required angle correction for returnability control. Finally, simulations with Trucksim and Matlab/Simulink and steering bench tests are conducted on the retrunability performance of steering wheel under different conditions, and the results show that the active returnability control strategy proposed can effectively enhance the stability and control accuracy of steering wheel returnability.

Key words: commercial vehicle, electro?hydraulic coupling steering system, UKF observer, sliding mode control