Upcoming stringent Euro-6 emission regulations for passenger vehicle better
fuel economy, low cost are the key challenges for engine development. In this
paper, 2.2L, multi cylinder diesel engine have been tested for four different
piston bowls designed for compression ratio of CR 15.5 to improve in cylinder
performance and reduce emissions. These combustion chambers were verified in
CFD at two full load points. 14 mode points have been derived using vehicle
model run in AVL CRUISE software as per NEDC cycle based on time weightage
factor. Base engine with compression ratio CR16.5 for full load performance
and 14-mode points on Engine test bench was taken as reference for
comparison. The bowl with flat face on bottom corner has shown reduction 25%
and 12 % NOx emissions at 1500 and 3750 rpm full load points at same level of
Soot emissions. Three piston bowls were tested for full load performance and
14 mode points on engine test bench and combustion chamber ?C? has shown
improvement in thermal efficiency by 0.8%. Combinations of cooled EGR and
combustion chamber ?C? with geometrical changes in engine have reduced
exhaust NOx, soot and CO emissions by 22%, 9 % and 64 % as compared to base
engine at 14 mode points on engine test bench.
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