Flywheel/Encoder patterns

[Mazda Ebrahimi]

Jeffrey Engel wrote:
> 
> > Subject:       Re: Flywheel/Encoder patterns
> > From:          Kalle Pihlajasaari <kalle at device.data.co.za>
> 
> > Hi There,
>
> An encoder giving absolute crank position would implicitly supply an
> interrupt when the position changes value. Reading crank position directly
> means you wouldn't have to fool with timers or counters to derive it. You'd
> also know exactly what the position is upon start-up without having to store
> the last known position info upon shutdown. No way around the cam sensor tho
> that I can see.

The only real world advatage I see to the encoder is quicker starting with lower 
emissions.  Updating the degree count takes very little time in the processor.  We still 
have to employ a timer to calculate RPM, right?