"nik ." wrote:

> Hi Denny, I want to multiply the rpm with map values (continuously update=
d
> too) to derive injector pw. All this is much later. I'm starting with rpm
> ideas and writing some basic code for that.
>
> Rev range 7000rpm with 250rpm or 500rpm res.

There are a few engine controller reference designs around that are essenti=
ally
the starting point for most of the automotive companies ECU's

The current ECU's are using the crank (typically 36-1 or 60-2) or cam
timing wheels to provide a reference to a software angle counter
that resolves the rotation into 7200 or 72000 counts per 720 degree
engine cycle.

Everything then is triggered on this count. It is from this count that
RPM information can be calculated. One thing is the accelerations on the
crank are significant.

Regards

Walter Banks
Byte Craft Limited
http://www.bytecraft.com

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