Lowest Engine Out Emissions as the Key to the Future of the Heavy Duty Diesel Engine – New Development Results

Authors

Prof. Dr. F. X. Moser, Dipl.-Ing. R. Dreisbach, Dr.-Ing. T. Sams, AVL List GmbH, Graz

Year

2004

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 566

Summary

Latest development results on heavy duty diesel engines show that from today’s point of view it is possible to achieve the required U.S. emission limits for 2010 with corresponding exhaust gas aftertreatment. However, based on the achievable NOx and particulates engine out emissions of approximately 1,0 g/kWh NOx and 0,06 g/kWh PM, exhaust gas aftertreatment systems with DeNOx and filter efficiencies of at least 90 % are mandatory. To achieve the mentioned engine out emissions it is necessary to realize engine concepts with a peak firing pressure capability of at least 200 bar, cooled exhaust gas recirculation with EGR rates of 25 % at full load, injection systems with a pressure potential of 2400 bar and two-stage turbocharging. Turbocharger efficiencies of more than 50% are required to keep the unavoidable increase of fuel consumption within acceptable limits. For Europe the same applies in case Europe would introduce the U.S. limits. In case the limits for NOx would be set to approximataly 1,0 instead of 0,27 g/kWh, the then possible higher engine out emissions will allow reduced requirements for the engine concept along with a sigificantly better fuel consumption.

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