A comparison between cylinder charge composition of common rail diesel engine
by P. Eastwood, K. Tufail, T. Winstanley, A. Darlington, S. Karagiorgis, Y. Hardalupas, A.M.K.P.Taylor
International Journal of Vehicle Design (IJVD), Vol. 49, No. 1/2/3, 2009

Abstract: 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 ('quasi-steadystate'). 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 realisable reduction in overall NOx 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.

Online publication date: Mon, 30-Mar-2009

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