Mazda Family

There is a map where you can set the desried lamba value for all P and N values. But the real question is how does it try to reach that value. Ie: does it look at each event and if the last was richer that the value in the AFR target map then it takes away .XX ms from the next injector firing? and the opposite if lean? And does it keep trying to reach that target under all load conditions, like under part/full boost, part/full throttle, or is it only in vacuum. Finally is volt vs lamba linear on the input? I can program the output of the wideband to be linear or I can have it switch low and high depending which wide of stoich, if this is the case then whats the point of the target AFR map?

cewrx7r1

iTrader: (2)

From somwhere/someone in the past:

The FC Datalogit software has the recalc base feature which adds the fuel correction to the base fuel map and then reset all values of the correction map to 1.000.

But now have a look at the O2 feedback control and what the manual says about the fuel correction and base maps. The base map should be tuned to achieve a stoich mixture and then the fuel correction map should be tuned to achieve the desired A:F ratio.

Then the PowerFC has a setting for the o2 feedback control, that is the coefficient where it goes into open loop. The stock value for this is coefficient is 1.047. The PFC looks into the current cell of the fuel correction map and then compares the value with the value from the o2 feedback setting, if it's above, the PFC goes into open loop, below that value the PFC is in closed loop.

Now if you have used "recalc base" you tell the PFC to achieve a stoich mixture over the whole map, and the feedback control messes up.