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Time-Resolved Emission Behavior of SI Engine under Transient Throttle Operating Conditions during Start Phase
Published May 21, 2008 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Meeting
This work was investigated on the time-resolved regulated emission such as THC, NOx, and smoke behaviors emitted from the tailpipe of a gasoline engine under different throttle movement ramp rates with the fuel injection pressure during transient phase. Throttle ramp rates were classified into three patterns such as very fast (0.1s), mild (0.5s), and slow throttle gradient (1.0s) transient operation. Simultaneously measuring THC and NOx with fast response gas analyzers, a high sensitivity opacimeter for full flow type was used for smoke. To verify the emission formation mechanism during transient phase, various sensors and actuating signals were accurately diagnosed.