Posted to Emissions Forum on 10/14/2012
Re: Equivalencey Ratio PIDS
I'm unclear and interested in knowing more as well.
I read somewhere (sorry, can't remember if the source was
reliable) that the equivalence ratio is used in the feedback
strategy to allow for transient conditions while still
remaining in closed loop, like heavy
acceleration/deceleration, unusual coolant or intake air
temperatures, etc. If that's correct, it seems to me that an
A/F sensor would be more useful, but I believe that I've
also seen that in the data stream of a conventional HO2S
Additions and/or corrections are invited.
Quick Stop Smog & More
Sacramento, California, USA