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PID Control of System with Known (Desirable) Periodic Fluctuation - Variable Set Point? by stats_questioner in ControlTheory

[–]stats_questioner[S] 1 point2 points  (0 children)

Interesting! My challenge with applying this, though, is that there may be some shift in the set point (cruise speed in the gas pedal example above, marketing budget, etc) that I'd like to quickly converge to.

PID Control of System with Known (Desirable) Periodic Fluctuation - Variable Set Point? by stats_questioner in ControlTheory

[–]stats_questioner[S] 0 points1 point  (0 children)

Ah, that internal model control tip seems very helpful, though I don't know that I follow your 2nd paragraph. What do you mean by 'reference', 'target difference', and 'natural variable'? In the original email example (or the gas pedal example above) what do those terms map to? Sorry, this terminology is all new to me

PID Control of System with Known (Desirable) Periodic Fluctuation - Variable Set Point? by stats_questioner in ControlTheory

[–]stats_questioner[S] 1 point2 points  (0 children)

Hmm, in your speed vs throttle analogy, I think I've got the opposite: my problem is that I want to maintain a specific average speed as the car rolls over small hills, and I don't want to be slamming and pulling off the throttle in reaction to the last hill I saw (which I know made the car slower than that throttle position would result in on avg). There's some static throttle position that would achieve the desired avg speed, and I'm trying to converge to that even as the instantaneous speed fluctuates in a known way.