Process control constant Kp?

Larry Sutherland

· RE: Programming question BoeBot in chapter 8 process control a constant was introduced Kp which can very between 15 - 50 (35· text program).
·· Question: Where and why are these numbers?

Post Edited (Larry Sutherland) : 1/13/2008 7:15:15 PM GMT

Franklin

From the document
Currently, the proportional control is simply equal to the error: P = E. In actuality, the
error is multiplied by some constant, gain (KP), to adjust how much drive is applied for a
set amount of error: P = KPE

• Kp, Ki, Kd: Sets the gain constants for control.
If you read the document it explains most of it, the values are chosen to get the best results from the circuit and are not always the same.

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- Stephen

Larry Sutherland

It's the chosen value 35 I am wondering about. I understand how the equation works .

Martin Hebel

Can you reference the page you are seeing the 15 to 50 on?

-Martin

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SelmaWare Solutions - StampPlot GUI for controllers, XBee and Propeller Application Boards

Southern Illinois University Carbondale, Electronic Systems Technologies

American Technical Educator's Assoc. Conference·- April, Biloxi, MS. -- PROPELLER WORKSHOP!

Larry Sutherland

Yes that would be in· How the FollowingBoeBot.bs2 Works· page 286 in·Your Turn activity.

Larry Sutherland

I believe it goes back to Rotational Velocity vs. Pulse Width in Chapter 3 .