本文档是有关PID闭环控制的几个例子，对学习自动控制原理的朋友有很大的帮助！-This document is the PID closed-loop control of a few examples of automatic control theory of learning is very helpful friend!

闭环控制中比列积分微分的计算过程以及具体实现方法-Closed loop control PID calculate ways and how to achieve it