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Originally Posted by EricVanWyk
If I am understanding you correctly, you were essentially integrating the output of a PD controller, which would effectively give you a PI controller?
Integrated once, P becomes I, D becomes P, so PD = IP = PI?
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Yep, that's apparently what's going on. It explains why I've been improperly suggesting PD control where pretty much everyone else uses PI.
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I'm wondering if there are any useful side effects to this method... I'll ponder it more when I'm not on drugs (lousy cold!)
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I toyed with closed-loop speed control back in the IFI controller days, when debugging wasn't quite as easy as probing LabVIEW wires or opening a front panel window. I was using a servo as an analog indicator to show me what the PID computation was producing as its output, and I wanted a consistent zero point.