A production version of a V-8 engine was redesigned to run on partially premixed charge compression ignition (PCCI) combustion mode with conventional diesel fuel. The objective of the PCCI combustion experiments was to obtain low engine-out nitrogen oxide (NOx) and after-treatment tolerant soot emission level. Two fuel injection strategies were used during the PCCI combustion experiments: a) pilot-with-main injection strategy (Pil-M), b) pilot-with-main-and-post (PMP) injection strategy.In the Pil-M injection strategy, a significant fraction of the fuel was delivered early during the compression stroke. The early pilot helped to prepare a lean-mixture of enhanced homogeneity before the combustion was initiated. The combustion of this pilot injection followed by the main combustion helped to reduce soot for a constant NOx value. The pilot-injection timing and quantity had to be selected appropriately to retain the fuel-efficiency. Such an injection strategy was successful up to an engine load-level of 10bar BMEP. At higher load levels, it was found that the Pil-M injection strategy was insufficient for a soot reduction. Therefore, the soot reduction was enhanced by using a small quantity of post injection to promote the late-cycle oxidation of soot. The PMP injection strategy helped to expand the load-limits of clean combustion to a load of 16.5 bar BMEP; however this injection strategy had a higher fuel-efficiency penalty as compared to the Pil-M injection strategy.


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    Titel :

    Development of a Fuel Injection Strategy for Partially Premixed Compression Ignition Combustion


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:
    Zoldak, Philip (Autor:in) / Kumar, Raj (Autor:in) / Espinosa, Raul (Autor:in) / de Ojeda, William (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2009


    Erschienen in:

    Erscheinungsdatum :

    2009-04-20


    Format / Umfang :

    16 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch