Relevance of valve overlap for meeting Euro 5 soot emissions requirements during load transient process in heavy duty diesel engines

  • J. Galindo /
  • J. R. Serrano /
  • F. Vera /
  • C. Cervelló /
  • M. Lejeune
Journal ar
International Journal of Vehicle Design
  • Volumen: 41
  • Número: 1-4
  • Fecha: 30 May 2006
  • Páginas: 343-367
  • ISSN: 01433369
  • Source Type: Journal
  • Document Type: Article
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. Copyright © 2006 Inderscience Enterprises Ltd.

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