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Closed loop at idle ..
Posted: Tue Oct 13, 2015 9:28 am
by Torque
I found that during idle the lamda voltage is at about .9V.
Trims are at -9.
If I up the revs to 2000 lambda voltage starts oscillating and trims go to -1 or 0.
(so as it should be)
I brought this up some time ago but still am marvelling what is going on.
Shouldn't the car idle at lamda 1?
Re: Closed loop at idle ..
Posted: Tue Oct 13, 2015 9:19 pm
by Matt
From what I know it should only close loop at cruise (not at idle)
Re: Closed loop at idle ..
Posted: Tue Oct 13, 2015 9:43 pm
by Torque
Ahhhh ... thanks Matt ...
That's exactly my observation.
Why do the fuel trims go up at idle?
I also noticed that trims go up with throttle movement.
Is that some 'enrichment' routine?
And (slightly off topic)
What is AFR MAX/MIN Coefficient?
Re: Closed loop at idle ..
Posted: Wed Oct 14, 2015 6:28 pm
by Matt
Nissans implementation of Z32 STFT/LTFT inside consult seem to reflect total enrichment adjustment (not just closed loop) so acceleration enrichment gets factored in when outside closed loop (which is why its not 0% around idle)
Re: Closed loop at idle ..
Posted: Thu Oct 15, 2015 2:24 am
by Torque
Is it still valid procedure then to adjust K till trims are as low as possible while in closed loop?
Re: Closed loop at idle ..
Posted: Thu Oct 15, 2015 2:36 pm
by Matt
When in closed loop it should be fine still to target 0%