说明：  常规PID 控制原理简单，容易实现，稳态无静差。因 此，长期以来广泛应用于工业过程控制，并取得了良好的 控制效果。已知对象的精确数学模型时，只要正确设定参 数，PID 调节器便可实现作用
(Conventional PID control is simple, easy, steady-state non-static error. Therefore, a long time widely used in industrial process control, and achieved good control effect. Accurate mathematical model of known objects, as long as the right to set parameters, PID controller function can be realized)