Hi all,

Can anyone please explain the "derivative" algorithm of the PID Auto-tuner in MATLAB? How does it work? What is the function of the filter coeeficient, N?? What will be the effect if I obtain a negative value for the derivative parameter?

Generally, the function of derivative in PID controller is to minimize the magnitude of overshoot caused by the integral control component. Is this same principle apply to the derivative algorithm in that PID auto-tuner??

Please advice. Very sorry for keep posting different title of posts, as I have run into several problems which are quite unrelated. So, I just separate them in different posts. Thank you very much.

Regards

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