中文摘要：

汽车的转向特性是研究及评价现代汽车安全性能最重要的指标之一。当汽车处于高速、紧急转向的状态时，车辆容易失控，因此有必要对汽车的转向特性进行分析。根据给定的技术参，建立汽车线性二自由度汽车动力学模型，利用MATLAB/Simulink软件建立汽车控制仿真模型，比较汽车在不同前轮角阶跃输入和不同车速下的车身姿态，研究汽车的转向特性，进而对汽车操纵稳定性进行评价。结果表明，汽车的行驶速度、前轮转角以及轮胎的侧偏刚度对汽车操纵稳定性有很大影响。当汽车以较低速度，较小的前轮转角行驶，并且选用较大侧偏刚度的轮胎是相对安全的。

英文摘要：

Vehicle steering characteristics is one of the most important indicators of studying and evaluating the modern automotive safety performance. When the car is in a state of high speed or emergency steering,the vehicle is easily out of control. So the study of vehicle steering characteristics analysis is necessary for the research on the vehicle＆#39;s steering stability. The linear 2-dof vehicle model is established in this article,based on the given parameters. A vehicle simulation model is established using MATLAB/Simulink, and postures of the vehicle in different front wheel angle step input and different speed are compared. The vehicle steering characteristic is studied,to evaluate the vehicle steering stability. Results show that the vehicle′s speed and front wheel angle as well as the tire cornering stiffness have a great influence on the vehicle steering stability. When a lower speed,a smaller angle,and the larger tire cornering stiffness of tire are chosen for the vehicle,it is relatively safe.