Quote:
Originally Posted by ike84
So rather than there being an operating range with high and low ends, the dme is just looking at greater or less than .45v? That makes my project much simpler! Thanks blue.
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Yes in simple terms that is sort of correct.
There is an operating range of both the O2 sensor and the DME
What I described is (as I say in very simple terms) how the STFT strategy works.
The primary reason for the rich-lean rich-lean strategy is Catalytic converter function.
It would be way better if you did some research on how the various sensors work and their relationship to each other.
Explanations can be rather complex.
If you want a better understanding of how the basic fueling strategy on a modern car works and it's relationship to the overall OBDII system. You need to study up on the function of:
MAF sensors, O2 sensors, and Catalytic converters, and most importantly their relationship to each other.
For MAF and O2 sensors research via "Bosch" they developed both for automotive use.
Also do a Wikipedia search for Catalytic converter function. Pay close attention to the section on three way Cats. That is what is used on all U.S. sold cars.
OBDII and fueling strategies are built or developed around Catalytic converter function.
Three way Catalytic converter function in particular.
Once you get a handle on how the sensors and cats function then go to youtube and look up "Scannerdanner" (Paul Danner) study everything he has on fuel trims. check his website out. he also has a book or two in print.
Do all I have mentioned and you will start to have a "general" understanding of how fueling and the OBDII system on a modern day car works.
Another interesting subject to look at is:
Rich burn versus lean burn engines....