Re: '747 and Proportional Stuff

["Bruce Plecan" <nacelp@bright.net>]

This all sounds exactly what you'd want to do for fuel variantions.  If you
see anything that *doesn't* correspond to the early fuel type report?..
I do appreciate the detailed explain.
Also, thou, might be a *fudge* for specifc O2 sensors.
Grumpy



> This term has been a source of confusion. Other's have stated that
> it's use is tied to different fuels, such as alcohol. This makes sense,
> as the O2 stoich switch point would most likely be different.
> However, I believe that there is more to it.
> The AFR term is used as a divisor in the BPW calculation. To do
> this, the AFR term is used as an index to do a table lookup. This
> table is the inverse AFR, and the resultant lookup is multiplied into
> the BPW. This has the same effect as using the AFR term as a
> divisor in the BPW calc (which it is).
> When open loop, the AFR term is determined by various
> lookups depending upon engine operating conditions. IE: If in
> PE, the AFR term is lower (~12.8), causing an increase in the
> BPW. By setting 'stoich' to the O2 switch point, the BPW calc
> is calibrated, it is based on a known. This way, it's all tied
> together, it allows for calc'ing a BPW for another AFR, simply
> by plugging that AFR into the BPW calculation.
> BobR.


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