中文说明：用MATLAB绘制发动机万有特性曲线map图。根据实验数据绘制发动机等燃油消耗曲线和等功率曲线图并进行三维曲线拟合得到万有特性曲线图，M语言中附有实验数据。
English Description：
The map of engine universal characteristic curve is drawn by MATLAB. According to the experimental data, the equal fuel consumption curve and equal power curve of the engine are drawn, and the universal characteristic curve is obtained by three-dimensional curve fitting. The experimental data are attached in M language.