[Diy_efi] How many Bits for PWM injection driver?

[Dave Dahlgren]

It was the smallest change that could be made.. if you are at 1.00000 ms and add
the next step you get 1.0625 ms. obviously it won't run at 0.0625 ms... but that
is the system resolution 16 ms period was the clock and 8 bits.. so every tick
is worth about 0.0625 ms. or is that 0.062745 really does not matter in the long
run the point is it worked on 2 systems just fine. You also can't get 100% duty
cycle till over 3750 rpm either.. not that I can see a problem with that unless
you have a diesel
Dave

Mike wrote:
> 
> Do I interpret from this that the smallest pulse width (presumably
> at idle and lowest revs) is 64 microseconds ?
> 
> Seems *real* small... was the system ever operating at this shirt
> time period and realiably/with stability ?
> 
> Rgds
> 
> mike
> 
> At 02:29 PM 8/8/2002 -0400, you wrote:
> >if the clock period is 16 ms. it ought to work ok that is all that a haltech
> >has/had and they ran fine. closest increment you could tune was 0.0625 ms.
> >Accell /DFI was about the same every step was 0.064 ms. In the DFI stuff I
> used
> >to work with you acutally enetred steps. #'s from 0 to 255...
> >Dave
> >
> >Les Dittert wrote:
> >>
> >> I tried several archive searches, but didn't see any mentioning if
> >> 8 bits would be too coarse. My gut feeling is that I could live with
> >> 256 steps.
> >> Would it be noticeable during mild throttle settings?
> >>
> >
> >
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