[Diy_efi] Data Logger CPU schematic and C for review

[Steven P. Donegan]

I'm glad you have this level of knowledge - tag you're it :-)

The hardware part I have prototyped already and a scope did show the
curves I expect. I will get back to that board after the data logger is
completed...

On Sat, 2007-02-03 at 14:45 -0800, Adam Wade wrote:
> --- "Steven P. Donegan" <steve at donegan.org> wrote:
> 
> > The ION stuff is basically watching for spark plug
> > event, then for 2-3 curves in data and finding the
> > correct ones - one indicates ping, one is peak
> > pressure - there are others... It's been done
> > on a slow 32 bit controller so it should be do-able
> > on the ARM...
> 
> The difficulty comes in wanting to go beyond a few
> simple basic curves to more complex data; for
> instance, closed-loop spark control that can "see"
> ping and PPP timing, or closed-loop fueling control
> from watching vagaries in the ion trace that indicate
> different end gas compositions.  This is where FFT
> becomes necessary, since you have essentially several
> sets of low-signal data all meshed together.  For
> basic patytern-matching, though, a LUT would probably
> be acceptable, provided you weren't running an engine
> where the normal ion trace was fairly close to one of
> those in the "library"; the trace will vary with
> combustion chamber size, heat of combustion,
> combustion speed, fuel mixture, spark timing...  And
> so on.
> 
> | Kawasaki Zephyr 615 (Daphne)       Kawasaki Zephyr 550 (Velma)|
> | "It was like an emergency ward after a great catastrophe; it  |
> |   didn't matter what race or class the victims belonged to.   |
> |  They were all given the same miracle drug, which was coffee. |
> |   The catastrophe in this case, of course, was that the sun   |
> |     had come up again."                    -Kurt Vonnegut     |
> | M/C Fuel Inj. Hndbk. @ Amazon.com -  http://tinyurl.com/6o3ze |
> 
> 
>  
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