在工业应用中PID及其衍生算法是应用最广泛的算法之一，是当之无愧的万能算法，如果能够熟练掌握PID算法的设计与实现过程，对于一般的研发人员来讲，应该是足够应对一般研发问题了，而难能可贵的是，在我所接触的控制算法当中，PID控制算法又是最简单，最能体现反馈思想的控制算法，可谓经典中的经典。经典的未必是复杂的，经典的东西常常是简单的，而且是最简单的，想想牛顿的力学三大定律吧，想想爱因斯坦的质能方程吧，何等的简单！简单的不是原始的，简单的也不是落后的，简单到了美的程度。(PID and its derivative algorithm is one of the most widely used algorithm in industrial applications, the universal algorithm is fully deserve to master, if the process of design and implementation of PID algorithm for general R & D personnel, should be sufficient to deal with the problem of general R & D, and to be valuable, I contacted the control algorithm among them, PID is the most simple control algorithm, control algorithm can best embody the feedback of thought, is the classic classic. Classics are not necessarily complicated. Classical things are often simple, and they are the simplest. Consider the three laws of Newton's mechanics. Think of Einstein's equations of mass and energy, how simple! Simple is not primitive, simple is not backward, simple to the extent of the United states.)