On Wed, May 26, 2004 at 12:47:29PM -0300, Future wrote:
> I can4t believe a 10mips (18f452@40mhz) processor is too slow to do fuel
> and spark management.
>
> Maybe it will not be the best solution, but will always be better than any
> carburetor.
>

Just as a point of reference, GM cars in the late 80's early 90's used a
Motorola 68HC11F1 (ish) processor, with interrupts going every 6.25ms for firing
injectors, and larger calculations every 16 interrupts.

I'm not sure about the speed they were running at though.

I think an 18F452 would be enough to run a fuel injected setup with some
additional A/D peripherals.

This schematic is for the 749 ECM which is a 2bar version of the 730 ECM that
was used in almost every GM multiport fuel injected setup from 86-92:

http://www.cruzers.com/~ludis/1227749schematic.html

--
Alex Harford
http://www.alexharford.com
alex-spam@alexharford.com       Tel: (604) 738-5674

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