Abstract
This paper deals with improvements in combustion and exhaust gas emissions in a single cylinder Diesel engine for heavy-duty commercial vehicle applications. A low compression ratio type piston was used to assure suitable ignition delay time during which sufficient air was introduced into the spray plume to suppress NO_x and soot formation. As a result, PCI combustion successfully controls NO and soot emissions simultaneously at 40% load. At 50% load, 70% EGR with 100kPa (gage) supercharging favorably reduce both emissions. In addition, after-injection was also tested to reduce THC and soot emissions at the same load.
