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.
Stored and lost fuel quantities after engine start-up
Kraftstoffverlust und -lagerung nach Anlassen des Fahrzeugmotors
1997
16 Seiten, 7 Bilder, 11 Quellen
Conference paper
English
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