Using a diesel passenger-car, we measured charge composition and emissions of nitrogen oxide and soot, on the European extra-urban drive cycle (EUDC), and also on isolated transients, representative of the EUDC. Our objective was to compare emissions and charge composition, between a transient, and engine operation at specific points on the transient locus ('quasisteadystate'). On the EUDC, we measured two nitrogen oxide spikes. The first, fast-response nitrogen oxide spike, could be ascribed to the pedal demand step input: this is small, compared to the second nitrogen oxide spike resulting from the remainder of the transient (adjustments in speed and load). The estimated charge composition, in a transient, agreed closely with the measurement, both qualitatively and quantitatively. The burned-gas fraction (BGF), estimated from a transient, revealed that the period of largest discrepancy from that demanded, is short (~1 sec). This indicates that the use of BGF, rather than the customary mass air-flow, may be more apposite during transients encountered in real driving. However, since this discrepancy is short-lived, the realizable reduction in overall NO(x) emissions, using BGF as a controlled variable, at least during the EUDC, is likely to be small. BGF-based control is nevertheless attractive, insofar as boundary conditions bearing direct relationships to combustion are easily imposed.


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    Titel :

    A comparison between cylinder charge composition of common rail diesel engine


    Beteiligte:
    Eastwood, P. (Autor:in) / Tufail, K. (Autor:in) / Winstanley, T. (Autor:in) / Darlington, A. (Autor:in) / Karagiorgis, S. (Autor:in) / Hardalupas, Y. (Autor:in) / Taylor, A.M.K.P. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2009


    Format / Umfang :

    18 Seiten, 12 Bilder, 25 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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