> > Another way of measuring fuel is measuring the pulse width of the fuel
> > injectors, and if you know the flow characteristics of the fuel
> > injector (as well as the speed of the vehicle), you can very
> > accurately compute fuel economy.
> One other factor that I haven't seen mentioned yet is the voltage
> applied to the injector coil.  It is important as it varies continually
> and directly influences how fast the injector opens and subsequently how
> much fuel flows for a given pulse width.  I learned about this when
> looking at the MegaSquirt DIY fuel injection system.

The fuel injection computer will already have corrected for that. Unless
your vehicle is constantly under a start condition or is operating under
about 13 volts (which won't happen in a properly functioning vehicle),
it'll have negligible (if any measurable) impact on the measurement
system.

It also adjusts the charge time for the ignition coils based on battery
voltage.

-->Neil

-------------------------------------------------------------------------------
Neil Bradley            In the land of the blind, the one eyed man is not
Synthcom Systems, Inc.  king - he's a prisoner.
ICQ #29402898

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