shuaijianquxianfa

代码说明：

  采用衰减曲线法计算系统P、PI、PID控制器参数，绘制整定后系统的单位阶跃响应曲线。(The attenuation curve method is used to calculate the parameters of P, PI and PID controllers, and the unit step response curve of the system after setting is drawn.)