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MPG calculation?

Discussion in 'Gen 2 Prius Technical Discussion' started by bcrill, Aug 18, 2006.

  1. bcrill

    bcrill Junior Member

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    Hi folks,

    I'm wondering - does anyone know how the Prius estimates the MPG that appears in real-time on the display?

    I can't imagine that it would literally divide the distance driven by the fuel flowing to the ICE during the ~ 1 second update time - seems like you'd get a large error dividing two small numbers.

    Thanks!
     
    #1 bcrill, Aug 18, 2006
  2. kevinwhite

    kevinwhite Active Member

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    <div class='quotetop'>QUOTE(bcrill @ Aug 18 2006, 02:02 PM) [snapback]305550[/snapback]</div>
    I'm sure that's what it does - there is no other information available.

    That probably gives a lower limit on the update period or the quantization in distance or volume would be too great.

    The five minute bars use information obtained over a longer period so the quantization error will be smaller.

    kevin
     
    #2 kevinwhite, Aug 18, 2006
  3. hobbit

    hobbit Senior Member

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    vehicle speed and distance
    injector duration and frequency
    *assumes* nominal fuel pressure behind it
    .
    _H*
     
    #3 hobbit, Aug 18, 2006
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