The effects of temperatures of catalytic converter, intake temperatures and fuel skip injections on engine-out HC emissions were investigated during cold and hot start. The tests were conducted according to engine cooling temperatures which were contr...
The effects of temperatures of catalytic converter, intake temperatures and fuel skip injections on engine-out HC emissions were investigated during cold and hot start. The tests were conducted according to engine cooling temperatures which were controlled by simulated coolant temperatures of cold and hot start, on a 1.5L, 4-cylinder, 16valve, multipoint-port-fuel-injection gasoline engine. Real time engine-out HC emissions were measured at a exhaust port and cylinder head using Fast Response Flame Ionization Detector (FRFID).
Unburned hydrocarbons emitted at the cold coolant temperature were much higher than those of the hot coolant temperatures. And temperatures of catalytic converter and applications of fuel skip injections which can be controlled with coolant temperatures provide the high potential for start-up engine-out HC emissions reduction.