zileger和getfod函数可以实现对传递函数分析，计算PID的三个参数，便于进行设计PID

zileger和getfod函数可以实现对传递函数分析，计算PID的三个参数，便于进行设计PID-zileger and getfod function can be achieved on the transfer function analysis, computation of the three PID parameters, to facilitate the design of PID

可以将模型经过转换计算求其ziegler-nichols整定公式中的参数K,L,T-Model can be after conversion calculation to find the Ziegler-Nichols tuning to the argument in the formula K, L, and T