转向机黏滑分析与控制优化研究

Stick-Slip Vibration Analysis and Software Function Control Optimization of Steering Gear

为解决转向系统各零部件间发生相对旋转摩擦而产生黏滑(Stick slip)振动及噪声,导致转向不够平滑的问题,针对转向机蜗轮蜗杆减速机构产生的黏滑实际问题,通过试验确定问题来源,建立理论受力模型和CAE仿真分析模型,确定相关影响因子,同步开发转向机的扭矩防跌落(MSP)功能,进行软件功能架构和各模块接口设计,通过软件功能调试优化并设定激活参数,最终锁定电机输出幅值为0.03 N·m的方波扭矩,满足软件层面的实时控制要求,提升了整车操纵舒适性。

The steering system produces stick-slip vibration and noise due to the relative rotational friction between various components,resulting in unsmooth steering.To solve this problem,this paper studies the practical problems of stick-slip caused by worm gear deceleration mechanism of steering gear.The source of the problems are identified through tests,and the relevant influencing factors are determined by establishing a theoretical force model and CAE simulation analysis model.The torque anti-drop function MSP(Mechanical Stuck Prevention)of the steering gear is developed simultaneously.The software functional architecture and module interfaces are designed and the activation parameters are set through the debugging and optimization of the software functions.Finally,the output square wave signal of the motor torque 0.03 N·m is locked,which satisfies the software real-time control requirement,and improves the handing comfort of the vehicle.