中文说明：专家PID控制仿真实例，求三阶传递函数的阶跃响应，对象采用时间是1ms，采样对象运用Z变换厚离散化，设计专家PID控制器
English Description：
Expert PID control simulation, and third-order transfer function of the step response, time is 1ms, sampler objects using discretization of the z-transform of thick, design expert PID controller