The use of pistons made of fine grain carbon was investigated in a spark-ignition engine within a European Community funded research project (TPRO-CT92-0008). Pistons were designed and manufactured and then tested in a single cylinder engine. Due to the carbon material's lower coefficient of thermal expansion the top land clearance between piston and cylinder can be reduced by a factor of three in comparison to standard aluminium designs.Under steady-state part-load operating conditions the emission of unburned hydrocarbons can be reduced by more than 15% compared to aluminium pistons, without significant penalties in NOx-emissions. Simultaneously, a small improvement in fuel economy of about 2% is observed. At full-load blow-by leakage flow is reduced by more than 50%. The piston crown temperature is about 30°C higher with the carbon piston than with the standard aluminium piston, due to the lower thermal conductivity of the carbon material. Under cold-start and warm-up conditions the reduction in hydrocarbon emissions can be as high as 28%, depending on the piston design. For maximum benefit the carbon piston crown has to be coated, in order to close the pistons porosity.


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    Titel :

    Reduction of Hydrocarbon Emissions from SI-Engines by Use of Carbon Pistons


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Arndt, Jörg (Autor:in) / Haag, Jürgen (Autor:in) / Heuer, Jürgen (Autor:in) / Wunderlich, Klaus (Autor:in) / Stock, Mario (Autor:in) / Krämer, Michael (Autor:in) / Pischinger, Stefan (Autor:in) / Coelingh, Wim (Autor:in)

    Kongress:

    1995 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1995



    Erscheinungsdatum :

    01.10.1995




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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