Knock sensing and retarding ignition

[Ron Schroeder]

Hi Stephan,

I have been thinking of doing the same thing to replicate vac advance on a
NA engine.  For an ignition driver, use something like the injector driver
on the MegaSquirt.  It could then directly drive the coil or be seen by the
ignition module as points.

Ron Schroeder
WD8CDH
day 631 344-4561
nite 631 286-5677

----- Original Message -----
From: "Stephen Webb" <swebb at netlab.uky.edu>
To: <diy_efi at diy-efi.org>
Sent: Thursday, January 24, 2002 1:46 PM
Subject: Re: Knock sensing and retarding ignition
> I have thought about doing this, and may, as time permits.
>
> I have a motorola MPX something or another map sensor (2.5 bar?), National
> LM1815 (? I think) variable reluctance negative slope zero crossing
> detector IC.  To glue it all together in an intelligent way, I have a
> PIC microcontroller.
>
> Basically the idea is to use the ADC on the pic to read the MAP signal,
> and either compute or look up a retard value.
<snip>
> *I'm not sure of a "good" way to trigger the ignition module from the
> pic.  Normally it sees the signal from the distributor, which I don't know
> how to replicate, but I suspect there is an easy way to reliably trigger
> the thing.  Anyone?

----------------------------------------------------------------------------
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