Ign Advance on MR-2

[David Hunt]

If you put the correct filter on the sensor the effect of ambient light is
greatly reduced.  Also, if you use a red led you can see any problems that
crop up.  If you use a red plastic filter, you see exactly what the sensor
sees.

The IR type are cute but difficult to troubleshoot.

dh

----- Original Message -----
From: "Diehl, Jeffrey" <jdiehl at sandia.gov>
To: "'Bruce '" <nacelp at bright.net>; <diy_efi at diy-efi.org>
Sent: Wednesday, August 22, 2001 3:56 PM
Subject: RE: Ign Advance on MR-2


> 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.
>
>
> ------------------------------------------------------------------------
> ----
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
> quotes)
> in the body of a message (not the subject) to
> majordomo at lists.diy-efi.org
>
>
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>


----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org