A comparison between cylinder charge composition of common rail diesel engine

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A comparison between cylinder charge composition of common rail diesel engine

Eastwood, P. / Tufail, K. / Winstanley, T. / Darlington, A. / Karagiorgis, S. / Hardalupas, Y. / Taylor, A.M.K.P.

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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Document information

Title :

A comparison between cylinder charge composition of common rail diesel engine

Contributors:

Eastwood, P. (author) / Tufail, K. (author) / Winstanley, T. (author) / Darlington, A. (author) / Karagiorgis, S. (author) / Hardalupas, Y. (author) / Taylor, A.M.K.P. (author)

Published in:

International Journal of Vehicle Design ; 49 , 1-3 ; 150-167

Publication date :

2009

Size :

18 Seiten, 12 Bilder, 25 Quellen

ISSN :

0143-3369

DOI :

https://doi.org/10.1504/IJVD.2009.024245

Type of media :

Article (Journal)