Experimental studies of fuel utilisation during the early stages of engine warm-up after cold-starts are reported. The investigation has been carried out on a 1.8 l, 4 cylinder spark-ignition engine with port electronic fuel injection. The relationship between fuel supplied and fuel accounted for by the analysis of exhaust gas composition shows that a significant mass of fuel supplied is temporarily stored or permanently lost. An interpretation of data is made which allows time-dependent variations of these to be separately resolved and estimates of fuel quantities made. The data covers a range of cold-start conditions down to -5 degC at which, on a per cylinder basis, fuel stored peaks typically at around 0.5 g and a total of 1 g is returned over 100 seconds of engine running. Fuel lost past the piston typically accounts for 2 g over 200 to 300 seconds of running. Fuel stored is poorly mixed on return to the bulk mixture and passes into the exhaust system primarily as unburned hydrocarbons.


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    Title :

    Stored and lost fuel quantities after engine start-up


    Additional title:

    Kraftstoffverlust und -lagerung nach Anlassen des Fahrzeugmotors


    Contributors:


    Publication date :

    1997


    Size :

    16 Seiten, 7 Bilder, 11 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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