Characteristics of HC Emissions by Starting Conditions in an SI Engine 18ICES/037
Authors
Seongsoo Kim - Silla University
Abstract
During the SI engine starting up, starting conditions directly contribute to the unburned hydrocarbon emissions in spark ignition engines. The effects of catalytic converter temperatures and fuel injection skip methods on HC emissions were investigated. The test was conducted on a 1.5L, 4-cylinder, 16 valves, and multipoint-port-fuel-injection gasoline engine. To understand the formation of HC emissions, HC concentration was measured in an exhaust port using a Fast Response Flame Ionization Detector (FRFID). The result showed that HC emissions, which were emitted at the cold coolant and the catalytic converter temperature, were generated much higher than those of hot coolant and catalytic converter temperatures. In additions, fuel injection skips reduced highly HC emissions. It is convinced that optimized fuel injection skip method according to coolant and catalytic converter temperatures could be applied to reduce HC emissions during the SI engine startings.