Browse Publications Technical Papers 2002-01-0503
2002-03-04

Influence of Multiple Injection Strategies on Emissions, Combustion Noise and BSFC of a DI Common Rail Diesel Engine 2002-01-0503

High pressure common-rail injection systems nowadays allow a very high degree of flexibility in the timing and quantity control of multiple injections, which can be used to obtain significant reductions in engine noise and emissions.
The aim of this study is to develop a better understanding of the relationship between injection strategies and the combustion and emission formation process.
Some multiple injection strategies (pilot-pilot-main and pilot-main-after) have therefore been analyzed to highlight their influence on soot, NOx, combustion noise and bsfc (brake specific fuel consumption) on a passenger car DI Diesel engine prototype.
One operating point (2000×2 rpm/bar) was analyzed for the pilot-pilot-main injection strategy while two operating points (1500×5 and 2500×8 rpm/bar) were tested for the pilot-main-after injection strategy.
Finally the main combustion characteristics were determined, for each operating condition, on the basis of the heat release and a correlation was attempted between the combustion parameters and emissions, noise and bsfc.

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