3 ms·
In the typical pedagogy, D is only necessary if you feel the PI isn’t responding fast enough (for rapid control). D, being very sensitive to high frequencies, h
by ssivark 7y ago
In the typical pedagogy, D is only necessary if you feel the PI isn’t responding fast enough (for rapid control). D, being very sensitive to high frequencies, helps with that.
- themeiguoren 7y agoAnd the reason you’d leave it out is because a PI controller is guaranteed to be stable with positive gains. Throw the D term in there and you have to start checking pole positions to make sure your system doesn’t blow up.