Effects of post-injections on diesel engine emissions and efficiency at low load using design of experiments

R.C. Willems, R. Dreezen, P.C. Bakker, L.M.T. Somers

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Abstract

A design of experiments and regression analysis are used to investigate the influence of engine operating conditions on post-injection efficacy. The study targets emissions of engine-out soot and NOx, as well as fuel economy and is performed on a typical heavy-duty diesel engine at a relatively low load. The regression models indicate the presence of a strong correlation between available oxygen, reduction in engine-out soot and optimal post-injection scheduling. This observation strengthens the suggestion that enhanced late-cycle mixing of fuel and oxidizer is an important contributor to the soot reduction capabilities of post-injections. Decrements in both NOx emissions and fuel consumption are established for a particular post-injection scheme, although an intricate synergy with EGR rate was found, emphasizing the importance of careful scheduling of a post-injection event.
Original languageEnglish
Title of host publication8th European Combustion Meeting (ECM 2017), April 18-21, Dubrovnik, Croatia
Pages1088-1093
Number of pages6
Publication statusPublished - 18 Apr 2017
Event8th European Combustion Meeting (ECM 2017), April 18-21, Dubrovnik, Croatia - Dubrovnik, Dubrovnik, Croatia
Duration: 18 Apr 201721 Apr 2017
http://www.adriacombustioninstitute.org/ecm2017/

Conference

Conference8th European Combustion Meeting (ECM 2017), April 18-21, Dubrovnik, Croatia
Abbreviated titleECM 2017
CountryCroatia
CityDubrovnik
Period18/04/1721/04/17
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Willems, R. C., Dreezen, R., Bakker, P. C., & Somers, L. M. T. (2017). Effects of post-injections on diesel engine emissions and efficiency at low load using design of experiments. In 8th European Combustion Meeting (ECM 2017), April 18-21, Dubrovnik, Croatia (pp. 1088-1093)