Relevance of valve overlap for meeting Euro 5 soot emissions requirements during load transient process in heavy duty diesel engines Online publication date: Thu, 04-May-2006
by J. Galindo, J.R. Serrano, F. Vera, C. Cervello, M. Lejeune
International Journal of Vehicle Design (IJVD), Vol. 41, No. 1/2/3/4, 2006
Abstract: This work describes the influence on performance and soot emissions of using different valve overlap camshafts during load transient processes in a heavy duty (HD) diesel engine equipped with a variable geometry turbine (VGT) in its turbocharger and a selective catalyst reactor (SCR) in the exhaust line. Based on the results of experiments and calculations, in this paper a description is given of how the valve timing affects the instantaneous exhaust and intake pressure, the short-circuit of the air mass flow, the prejudicial backflows, the performance of the turbine and hence the general performance and pollutant emissions of a VGT equipped HD diesel engine during a transient process. The paper concludes that very low or no overlap is imperative if a VGT is used to meet forthcoming pollutant emissions restrictions and to improve the transient response of HD turbocharged diesel engines.
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