基于稳态增益的主动转向系统可变传动比模型  

Modeling of variable steering ratio with steady-state gain for active steering system

作　　者：商高高[1] 洪泽[1] 张红党[1] 罗石[1] 何仁[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2010年第3期278-282,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省六大人才高峰项目(E-2002-012)

摘　　要：分析了主动前轮转向系统双行星齿轮机构的工作原理,根据前轮转角的合成机理,分别建立了方向盘转角和叠加转角的运动学模型,通过比较单、双行星齿轮机构输出轴与输入轴的转速差,发现双行星齿轮机构比单行星齿轮机构的传动效率高,从而进一步推导出基于双行星齿轮机构的电机转角随方向盘转角及传动比的变化关系;为了改善汽车的动态转向特性及其在高速直线行驶时的抗干扰能力,以车速为输入变量,参考车辆系统稳态增益的变化范围,构建了可变传动比计算模型.MATLAB/Simulink仿真结果表明:通过该模型计算得到的转向系统角传动比能够随着汽车行驶工况灵活变化,主动调整前轮转角,提高了汽车的操纵轻便性和行驶安全性.Based on the analysis of power transmission mechanism and the front steering angle synthesis mode in Active Front Steering（AFS） system,the kinematic models of steering wheel angle and superposition angle were established.Meanwhile the transmission efficiencies of the single and dual planetary gear sets were compared by calculating the difference between output shaft speed with the input one.Based on the principle of dual planetary gear set,the relation between motor steering angle and steering wheel anglewas described as well.Furthermore,in order to improve the dynamic steering response and the high speed driving stability of vehicle,the mathematic model of variable steering ratio was established by a reasonable assumption.The simulation results show the special functions of variable steering ratio.It means that the driving comfort and active safety can be both improved by AFS.

关 键 词：主动前轮转向 可变传动比 传动机构 稳态增益 

分 类 号：U463.4[机械工程—车辆工程]