TY - JOUR
T1 - Synergies of PCCI-type combustion and lean NOx Trap catalysis for diesel engines
AU - Parks, Jim
AU - Prikhodko, Vitaly
AU - Kass, Mike
AU - Huff, Shean
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85072473176&partnerID=8YFLogxK
U2 - 10.4271/2008-01-2493
DO - 10.4271/2008-01-2493
M3 - Conference article
AN - SCOPUS:85072473176
SN - 0148-7191
JO - SAE Technical Papers
JF - SAE Technical Papers
T2 - Powertrains, Fuels and Lubricants Meeting
Y2 - 6 October 2008 through 9 October 2008
ER -