Browse Publications Technical Papers 2008-01-2493
2008-10-06

Synergies of PCCI-Type Combustion and Lean NOx Trap Catalysis for Diesel Engines 2008-01-2493

It is widely recognized that future NOx and particulate matter (PM) emission targets for diesel engines cannot be met solely via advanced combustion over the full engine drive cycle. Therefore some combination of advanced combustion and aftertreatment technologies will be required. In this study, advanced combustion modes operating with a diesel particulate filter (DPF) and a lean NOx trap (LNT) catalyst were evaluated on a 1.7 liter 4-cylinder diesel engine. The combustion approaches included baseline engine operation with and without exhaust gas recirculation (EGR) and one PCCI-type (premixed charge combustion ignition) combustion mode to enable high efficiency clean combustion (HECC). Five steady-state operating conditions were evaluated. At the low load setting the exhaust temperature was too low to enable LNT regeneration and oxidation; however, HECC (low NOx) was achievable. HECC was also reached under more moderate loads and the exhaust temperatures were high enough to enable even further NOx reductions by the LNT, but CO and hydrocarbon emissions were increased. At high loads HECC becomes difficult but the LNT performance improves and acceptable regeneration can be met with enrichment methodologies.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Emissions Solutions for 2007 and 2010 Heavy-Duty Diesel Engines

2004-01-0124

View Details

TECHNICAL PAPER

Reduction Techniques of Exhaust Gas Emissions to Meet US EPA Tier4 Standard for Non-Road In-Direct Injection Diesel Engines

2014-32-0130

View Details

TECHNICAL PAPER

Effect of EGR on Autoignition, Combustion, Regulated Emissions and Aldehydes in DI Diesel Engines

2002-01-1153

View Details

X