说明：  Matlab仿真汽车行驶情况模型，可用于分析汽车受到不同阻力下的速度，受力情况。也可导入预先设置好的行驶速度文件进行仿真。
(Matlab simulation model cars with the situation, can be used to analyze the car speed under different resistance, the force. You can also import files pre-set travel speed simulation.)