Difference between AFR DIFFERENCE and O2 CORRECTION values?

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vipercrazy
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Joined: Mon Dec 31, 2012 2:48 am

Difference between AFR DIFFERENCE and O2 CORRECTION values?

Postby vipercrazy » Sun Jan 04, 2015 3:50 am

I have been using the AFR Difference value to determine my fuel trim %, I recently noticed the O2 Correction value and I cant seem to figure out exactly what it is measuring. Can anyone explain both of these values for me?

JimKden
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Joined: Wed Jan 12, 2011 2:28 am

Re: Difference between AFR DIFFERENCE and O2 CORRECTION valu

Postby JimKden » Sun Jan 04, 2015 6:10 am

I look at the O2 Correction as primary, then the AFR difference. Then I use the AFR difference to either reduce or increase the O2 Correction value and change the base fuel table by the corrected O2 Corr value. For example if the O2 correction is +5% and the AFR difference is -5% (minus means it is short on fuel for the target AFR) then the base fuel table should be corrected by 10%. I use that method because sometimes the O2 correcton is "catching up" and it may be under or over compensating at a given time.

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HaltechMatthew
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Re: Difference between AFR DIFFERENCE and O2 CORRECTION valu

Postby HaltechMatthew » Mon Jan 05, 2015 3:24 pm

AFR difference is simply current difference between the target and actual AFRs, the O2 correction is the amount the closed loop system is adjusting the fuel.

krisjanis
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Joined: Wed Oct 21, 2015 3:04 am

Re: Difference between AFR DIFFERENCE and O2 CORRECTION values?

Postby krisjanis » Mon Jul 11, 2016 1:57 am

Is this correct?

If AFR difference is 0,03 (is it correct, that I am 0,03 lambda values rich) example target: 0,9 - measured 0.87

and if I have difference -⁠0,03 (than I am 0,03 lambda values lean) target 0,9 - measured 0,93

JimKden
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Joined: Wed Jan 12, 2011 2:28 am

Re: Difference between AFR DIFFERENCE and O2 CORRECTION values?

Postby JimKden » Mon Jul 11, 2016 2:37 am

Then fix your fuel map!


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