[Diy_efi] Interesting AFR sensing idea

[Shannen at grolen.com]

DBut, how would you distinguish rich/lean from dry air/moist, normal/low
compression (due to mechanical fault), normal plug/faulty plug?  What
about swapping a set of standard plugs for a set of super platinum ultra
bug zappers?  What about wires that burn out?
Plug firing might make an additional sensor input, but I don't think it
should be the primary basis for fuel control
I>I was looking through some scope traces and explanations here:
DI>http://www.cnnw.net/~fourty/trendingdis.htm

DI>And something occurred to me.

DI>Would it be possible to detect precise AFR readings based on the firing volt
DI>of a cylinder's spark?

DI>If the voltage is higher the cylinder is lean, lower and it's rich.

DI>The real issue is determining the relationship between AFR and voltage.  Sin
DI>engine's vary and their spark systems do too.

DI>--Perry

DI>-- 
DI>Perry Harrington			Data Acquisition & Instrumentation, Inc	
DI>perry at dainst dot com					 http://www.dainst.com/

DI>Those who would give up essential liberty to purchase a little temporary saf
DI>deserve neither liberty or safety. Nor, are they likely to end up with eithe
DI>                             -- Benjamin Franklin

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