Ign Advance on MR-2

[Diehl, Jeffrey]

Ok, I'm convinced.  The LED is much easier to fabricate, but I intend to
drive this car to and from work and it needs to be reliable.

As an aside, is reflected light really that big of an issue if the car has a
hood on it?  Not trying to be difficult, but I have to ask.

I don't have much space between the crank puley and the car's frame.  How
much "meat" do I have to have in order to be able to sense it?

Thanx,
Mike Diehl.

-----Original Message-----
From: Bruce
To: diy_efi at diy-efi.org
Sent: 8/22/2000 9:52 AM
Subject: Re: Ign Advance on MR-2


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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