Ign Advance on MR-2

[Bruce]

Infra-red, and crank don't mix too well.
Sunlight can overwhelm it.
If you use a pulsed Source, is better, but sunlight, or reflected sunlight
can blind it.
Bruce

Diehl, Jeffrey" <jdiehl at sandia.gov>
Subject: RE: Ign Advance on MR-2
> I've heard a lot of talk about magnetic reluctor sensors and the
associated
> circuitry.  What about a Infra-Red emitter/receiver pair who's output goes
> through a Schmitt trigger?  This seems easier to design around...  What am
I
> missing?
> I could have two wheels attached to the crank pulley, one with 1 tooth,
and
> one with 4 teeth.  I might have to run the output through a flip-flop to
> reduce the frequency 1/2...  Then use a 2-bit counter to select one of 4
> transisters to turn on, which in turn charge/discharge the coil.
> This seems simple, actually.  Am I missing something?
> I can't use the cam gears for timing, because we intend to adjust the cam
> timing on the fly; this is why we need to build a circuit which emulates
the
> distributer, which is run off the exhaust cam.
> As you can see, we have suffered from feature creap.  We started out
simply
> wanting to emulate the distributor, now we are talking about a 4-coil DIS.
> <evil grin>
> Any comments are more than welcome.
> Thanx,
> Mike Diehl.


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