Abstract
ABSTRACT
Latest development results on heavy duty diesel engines show that the required U.S. emission limits for 2010 can only be achieved with DeNOx and filter efficiencies of at least 90 %. To realize the related engine-out emissions engine concepts with a peak firing pressure capability of at least 200 bar, cooled exhaust gas recircula-tion with EGR rates up to 25 % at full load, injection systems with a pressure potential of 2500 bar and two-stage turbocharging are necessary. 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 for instance1,0 instead of 0,27 g/kWh, the then possible higher engine-out emissions will allow reduced require-ments for the engine concept along with a significantly better fuel consumption.