直流电机闭环控制 在开环模型的基础上，在直流电机模型中加入PID模块，对其形成闭环控制。(DC motor closed-loop control Based on the open-loop model, a PID module is added to the DC motor model to form a closed-loop control.)

利用MATLAB仿真设计出前馈反馈水箱模型，PID已经调节完毕，可以直接使用(The feedforward feedback water tank model is designed by MATLAB simulation. PID has been adjusted and can be used directly.)