中文说明：智能算法，粒子群算法已经应用在各行各业当中，也已经取得了不错的效果。这个文件中，也是采用的是粒子群算法（PSO）来控制的PID参数让单位阶跃响应更好。
English Description：
Intelligent algorithms, PSO has been applied in all walks of life were also already achieved good results. This document also uses a PID parameters on particle swarm optimization (PSO) to control better to let the unit step response.