线控转向系统前轮主动转向控制策略研究

Study on front wheel active steering control strategy of SBW

文章的研究目的是实现线控转向系统前轮主动转向以改善车辆的行驶状态。文章首先对转向执行模块进行动力学分析,并设计出基于前馈控制的理想传动比;其次,结合理想传动比和状态反馈,建立前馈-反馈联合控制系统,以获得最优的前轮转角;最后,联合Carsim中的车辆模型进行仿真试验,并选取方向盘转角阶跃输入作为试验工况。结果表明,文章所采用的联合控制策略可实时调整前轮转角,有效地改善了车辆的行驶状态,为线控转向系统的研究提供了一定的参考价值。

The purpose of this paper is to realize the front wheel active steering of the SBW to improve the working state of the vehicle.Firstly,the dynamic analysis of the steering execution module is carried out,and an ideal transmission ratio based on feedforward control is designed.Secondly,combined with the ideal transmission ratio and state feedback,a feedforward-feedback joint control system is established to obtain the optimal front wheel Angle.Finally,the vehicle model in Carsim is combined for simulation test,and the steering wheel Angle step input is selected as the test condition.The results show that the joint control strategy adopted in this paper can adjust the front wheel Angle in time and effectively improve the running state of the vehicle,and this provides a certain reference value for the research of the SBW.