[Diy_efi] Info on how to make crank position sensor circuit?

[bcroe at juno.com]

Just how much more accuracy than individual flywheel teeth 
is really useful?  Bruce Roe

On Sun, 02 Jun 2002 23:33:17 -0700 David Gravereaux <davygrvy at pobox.com>
writes:
> 1) Count gear teeth on the flywheel from a HAL effect with a second 
> sensor in the distributor resetting which stroke the crank is on.
> 
> 2) Use a PLL and multiply the gear tooth frequency upto some factor 
> for greater precision in the counters.
> 
> Instead of using a timer to derive a rotational position, I'd prefer 
> to use "clicks" and count up to it all in hardware.  I'd like to use 
> this as
> the "server" part of an engine management system where I can 
> register (now
> in software) events such as injector open and spark fire and such.  
> Anyone ever built such a thing?

> David Gravereaux 

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