Author Topic: Closed Loop Monitor (Read 3554 times)

mrjezza · « **on:** June 20, 2006, 07:29:47 PM »

http://autospeed.drive.com.au/cms/A_1716/article.html

Does anyone know how one of these works (read: how I can make one without subscribing to that website

)?

johna · « **Reply #1 on:** June 20, 2006, 07:49:59 PM »

If you click the Print Article link (http://autospeed.drive.com.au/cms/A_1716/printArticle.html) you get some small photos from which you can probably work out the wiring.

johna · « **Reply #2 on:** June 20, 2006, 08:48:10 PM »

...and the photos are pretty easy to access too if you know what to look for:

mrjezza · « **Reply #3 on:** June 21, 2006, 02:06:09 AM »

Legend

I initially tried to access the pages by typing in page names manually but that didn't work so it never occurred to me it would for the images.

Well done

bmwman91 · « **Reply #4 on:** June 21, 2006, 11:41:19 AM »

So....it looks to see if the O2 output keeps bouncing above & below .45V (closed loop) vs. going consistently higher (richer at WOT & open-loop)?

The LM311 is a voltage comparator...and I guess the pot sets the O2 output threshold at which the LED gets turned on? Pretty nifty simple little device. For under $10 I would say it is worth it for tinkering enjoyment.