A single cylinder direct injection engines has been developed and commissioned on a transient engine test bed to study particulate mass emissions from different combustion modes. The engine is capable of 2/4 stroke operation by means of electro-hydraulic camless system. Both SI and CAI can be achieved with gasoline and its mixture with ethanol. In this study particulate matter emissions in selected combustion modes were measured and analysed. The following observations were made: (1) The particle emissions from the DI gasoline engine are dominated by smaller particles. (2) The presence of ethanol tends to reduce the formation and emission of soot particles in most combustion modes. The effect of ethanol content on soot reduction becomes saturated when ethanol concentration reaches 15%, irrespective of the combustion modes. (3) The particle size distribution of gasoline combustion is normally characterised with a peak between (1) nm to (3) nm in diameter. The combusiton of ethanol and gasoline blends minimises the presence of soot particles in such peak regions. (4) The exhaust particle size concentration and distribution is affected by the in-cylinder conditions at the time of injection and the subsequent mixture formation procees. Hotter charge and better mixing are the main parameters affecting the soot particles in the exhaust irrespective of the combustion mode.


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    Title :

    Particulate matter emission from different combustion modes in a 2/4 stroke switchable direct injection gasoline engine


    Contributors:
    Ojapah, M. (author) / Zhang, Y. (author) / Zhao, H. (author) / Ganippa, L. (author)


    Publication date :

    2011


    Size :

    9 Seiten, 5 Bilder, 1 Tabelle, 9 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English