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  1. #1
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    65
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    1,669

    Default car trip computer and fuel consumption

    Was thinking about this earlier on tonight. Totally random I know but that's how these things go for me sometimes.
    So, we have a 05 Magna Awd that has a trip computer in it. It gives an "at that point in time" (instantaneous?) fuel consumption figure. I was wondering how it works that out. As far as I'm aware they don't have a specific fuel flow sensor (At least I have never seen anything in the workshop manual about one) so I'm wondering how it measures how much fuel is being used at a given point in time.
    The only thing I can think of is it knows how long the injectors are open for ( I'm assuming its got sequential injector timing but not even sure about that) and it also knows what the fuel pressure in the fuel rail is and just calculates how much fuel goes through each injector for a given opening time.
    Then I suppose it just uses that figure with road speed to work out the consumption.
    Any thoughts?

    peter

  2. #2
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,541

    Default

    Injector stroke? (they are positive displacement)

    Michael

  3. #3
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Found this on goggle, and the link to it is below;
    The car's trip computer is measuring the fuel injector flow rates, engine temperature, fuel tank float level and other information gathered by the car's computer system.
    https://www.google.com/search?q=How+...hrome&ie=UTF-8
    To grow old is mandatory, growing up is optional.

  4. #4
    Join Date
    Aug 2008
    Location
    Charlestown NSW
    Age
    65
    Posts
    1,669

    Default

    I was too tired last night. Usually the first thing I do is search the net but last night it didn't even enter my head. Besides it nicer to talk to someone else - even if it is a conversation with a reply delay.
    peter

  5. #5
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Quote Originally Posted by bollie7 View Post
    Besides it nicer to talk to someone else - even if it is a conversation with a reply delay.
    peter
    My partner Pam says the same about me!!!!!!!!!!!!!!!!!!!!!
    To grow old is mandatory, growing up is optional.

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