Design of Modified Variable Steering Ratio Curve for Active Front Steering System

Abstract

Abstract:

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. Specifically, when online estimated friction coefficient decreases, vehicle target yaw rate decreases accordingly, thereby improving driving stability and safety on slippery roads.

Key words: vehicle engineering, active front steering, variable steering ratio curve, friction coefficient

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。

关键词: 车辆工程, 主动前轮转向, 变传动比曲线, 附着系数

CLC Number:

U463.4

Zhou Bing, Fan Lu , Lü Xuning. Design of Modified Variable Steering Ratio Curve for Active Front Steering System[J]. China Mechanical Engineering, 2014, 25(20): 2813-2818.

周兵, 范璐, 吕绪宁. 主动前轮转向系统改进型变传动比曲线设计[J]. 中国机械工程, 2014, 25(20): 2813-2818.

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