In the recently introduced MTU Series 2000 Common Rail engines for marine applications, a combustion technicque with multiple injections (i.e. pre-, main- and post-injection) has been established for the first time in this power range. The pre-injection helps reducing both NO(x)-emissions and combustion noise by lowering the gradient of the cylinder pressure increase. This opens the possibility to raise the injection pressure at low and intermediate engine speeds in order to improve spray atomization and consequently reduce the emissions of particulate matter during acceleration. The post-injection is used in order to enhance oxidation of soot during the late stages of combustion and thus helps to further reduce emissions of particulate matter. The paper gives a general overview about the characteristic engine features and technical data as well as a detailed description of the new injection system which allows for a secure and stable injection of even small pre- and post-injection fuel quantities. This injection system plays an important role in reaching the development goals, which are superior torque and acceleration with minimized emissions of noise and particulate matter while maintaining highest power density, low specific fuel consumption and an EPA Tier 2 emission level at the same time. Both the design of the injection system and the theoretical background about how pre- and post injections are utilized in order to increase torque and decrease emissions will be adressed in detail. Test data available from both test engines operated on a test bench and engines running on a test boat will be shown in order demonstrate the effectiveness of the concept of a high pressure Common Rail system with split injections for use in highspeed heavy duty Diesel engines.


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    Titel :

    Utilizing multiple injections for optimized performance and exhaust emissions with the MTU Series 2000 Common Rail marine engines


    Beteiligte:
    Stiesch, Gunnar (Autor:in) / Baumann, Hermann (Autor:in) / Wachter, Volker (Autor:in) / Schmitz, Josef (Autor:in) / Teetz, Christoph (Autor:in)


    Erscheinungsdatum :

    2007


    Format / Umfang :

    11 Seiten, 14 Bilder, 2 Tabellen, 5 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch