What does N represent in the PID formula (see image copied from the compensator tuning function)?

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Oren Eliezer 2020-7-6

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评论： Oren Eliezer 2020-7-9

采纳的回答： Vidya Sagar Reddy Kurre

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Vidya Sagar Reddy Kurre 2020-7-7

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Hello Oren,

N is Filter Coefficient.

Regards!

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Vidya Sagar Reddy Kurre 2020-7-8

编辑：Vidya Sagar Reddy Kurre 2020-7-8

Hello Oren,

The below image might help you understand the Filter application.

The same is explained at 09:38 duration in the first video link.

Thank You!! Regards.

Oren Eliezer 2020-7-9

Hello Vidya,

Ok, now I understand the structure. So the presence of this filter seems to be the defualt strcuture for the PID controller assumed in Simulink. In my application this is a discrete-time PID compensator for which no such filtering is in the D path. However, there is an analog low-pass filter in the output sensing, which gives an equivalent effect (doesn't matter much that it also acts on the signal that is also fed into the P and I branches). Now I noticed that there is a selection "use filtered derivative", which I can simply unselect to reduce the D path to simple derivative.

Thanks again,

Oren

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