中文说明：
在simulink中建立了一个汽车发动机模型，通过控制油门开度来达到控制发动机转速的目的。输入量是油门开度，输出是发动机转速。
English Description：
A car engine model is established in simulink, by controlling the throttle opening to achieve the goal of control engine speed.Input is the throttle opening, the output is the engine speed.