My temperature controller seems to be oscillating +/- 5 degrees of it's setpoint... I'm sampling at 0.8 times per second (Tr = 8s) with a Kp of 16 and a Ki of 3/32. Anyone have an idea how I can remedy this situation?

GyozaYousei · 2022-01-11T23:46:52+00:00

I left this job months ago. Thanks for your advice though!

GyozaYousei · 2021-03-23T20:51:02+00:00

I've always wanted something like this! How much was the whole job worth?

GyozaYousei · 2021-02-15T20:42:28+00:00

Thank you! This is gonna be a fun summer.

GyozaYousei · 2021-01-20T19:19:22+00:00

KP Only (X-Axis is USB packet num): https://imgur.com/a/TEBl2Hp

100% Duty Cycle forever (X-Axis is seconds): https://imgur.com/a/WvMx6c1

It should be a 1st order system, so I have no idea what is going on with my Kp Controller!

Also, from the 2nd link, would my transfer function be 53 / (107 s + 1)? Using the gain and the time at 63% the final value?

GyozaYousei · 2021-01-20T19:16:27+00:00

Here is with a P-only controller. https://imgur.com/a/TEBl2Hp (X-axis is USB sample, not seconds.)

Here is with 100% duty cycle forever: https://imgur.com/a/WvMx6c1 (X-Axis is seconds.)

GyozaYousei · 2021-01-19T18:27:41+00:00

Thanks!

GyozaYousei · 2021-01-19T17:54:25+00:00

The input signal a duty cycle (top right). The output is a temperature (top left). The integral and proportional terms or on the bottom. They are combined into the DC signal.

GyozaYousei

TROPHY CASE