Tuning PDF loop (pseudo derivative feedback)

hondgm · 2014-01-15T13:23:09+00:00

I know about the auto-tuning algorithm for PID: cycle the temperature up an d down, measure the peaks and distance between the peaks, and calculate Kp, Ki, and Kd. But recently I've been experimenting with what Phelan called PDF, and am in trigued by it. There isn't a lot of information out there about it, but ne arly everyone that's used it has good things to say. The problem is, how is it tuned? It only has a Ki and Kd, so that makes it slightly simpler. An auto-tune algo like the one I just mentioned would b e great, or at the very least, some general guide for manual tuning. A met hod that doesn't mention poles, zeros, or transforms would be nice because even though I have an EE degree, my strong point isn't controls. Either I forgot everything in my controls class or never learned it, I don' t know which.

Jan 15, 2014 42 Replies

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Spehro Pefhany 12 years ago

I'm pretty sure PID is in there between Locksmithing and Small Engine Repair.

Best regards, Spehro Pefhany

"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com

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Jim Thompson 12 years ago

[snip]

Reminds me of when a ran my power mower over a sewer clean-out and bent the crank :-(

Bought a new crank and piston assembly from Sears (this would have been around 1963) and put the thing back together. But I couldn't get it all to cinch up properly, so I started it up anyway, then tightened up the head, etc. Ran perfectly after that ;-) ...Jim Thompson

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Michael A. Terrell 12 years ago

And know how to use a blue wrench. :)

-- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.

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