中文说明：
压缩包包含1份matlab的model文件，1份pdf文件。建立了二自由度汽车模型及其运动微分方程，使用simulink进行了建模，进行了仿真试验和简单分析。
English Description：
The package contains one matlab model file and one PDF file. A two degree of freedom vehicle model and its motion differential equation are established. The model is established by using Simulink, and the simulation test and simple analysis are carried out