understandable explanation of PID parameters?

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01-09-2009, 05:01 AM

Zaphod

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understandable explanation of PID parameters?

Hi guys,

as I'd like to test the new MS2 closed loop boost control I need an understandable explanation of the PID parameters. I had a look at wikipedia in English as well as in German - I didn't understand even in German. The last time I had this type of maths was like 10 years ago when studying.

So could someone give me an "easy" explanation? Thanks!

01-09-2009, 10:12 AM

y8s

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P: a rubberband attached to a point. the further you are from that point, the stronger the rubber band pulls you back to it. Analagous to the spring on your car.

I: a temporal rubber band. the longer it's not centered on the set point, the stronger it gets. in other words, over time, it zeroes in better.

D: a shock absorber on your car. it damps the output of the controller as it approaches the set point. too low/soft and you get overshoot (cadillac). too high/hard and the reaction time of the system is sluggish and unstable.