John Pearson wrote:
>
> I am thinking of ways to control the ignition timing advance curve of a
> car. I was thinking that I might time the amount of time between cylinder
> firings and divide that number by 360. Then I would know when to fire the
> next cylinder after checking with a lookup table for the programmed curve.
>
> Is there a better or easier way?
>
> Thanks
>
> John

One thing is to remember that the less calculations you have to do while
the engine is running, the better.

Two ways I have found around this, is to precalculate data that is used
while the engine is running, or use a lookup table.

I used precalculated data with 4 stages of advance, vac adv, dwell and
RPM timing etc. It took a PIC 16F84 about 40 - 60 inline instructions to
get the timing for all these parameters as well as do the actual timing
from the results.

Check out

http://www.picnpoke.com/projects/ignition.html

There is some early downloadable code there that uses a lookup table.

--
Best regards

Tony

http://www.picnpoke.com
mailto:sales@picnpoke.com