主动前轮转向系统改进型变传动比曲线设计

摘要

为提高低附着系数路面下的车辆操纵稳定性，基于拟合变传动比曲线，采用模糊推理方法，设计了自适应改进型变传动比曲线，把可变传动比功能拓展至稳定性控制层面。在MATLAB/Simulink中的仿真分析验证了所设计的改进型变传动比曲线的有效性。当在线估算的路面附着系数减小时，车辆系统的增益也相应减小，从而使车辆理想横摆角速度响应也减小，提高了车辆在低附着路面行驶时的稳定性和安全性。%Based on the fitting variable steering ratio curve ,an adaptive modified variable steering ratio curve was proposed to enhance the stability on low friction coefficient roads .Simulations in MATLAB/Simulink show the effectiveness of proposed modified variable steering ratio curve .Specif-ically ,when online estimated friction coefficient decreases ,vehicle target yaw rate decreases according-ly ,thereby improving driving stability and safety on slippery roads .