Total and speciated, engine-out, hydrocarbon (HC) emissions have been measured as a function of time after a 23°C cold start of a gasoline-fueled, V-8 engine. Hydrocarbon emissions from two fuel injection systems were compared: a production port-fuel-injection (PFI) system; and a pre-vaporized (heated) central-fuel-injection (PV-CFI) system. The results indicate that, for this particular engine at the chosen operating conditions, the effect of fuel preparation on HC emissions during cold start is minimal at low load (2.57 bar IMEP (gross), MAP = 0.34 bar) but becomes significant at higher load (5.15 bar IMEP, MAP = 0.58 bar) early in the cold start.Comparison of the relative contribution to the exhaust HC of a series of fuel-derived alkanes suggests that fuel absorption in oil films is a minor contributor to HC emissions from this engine during a 23°C cold start.
Effect of Fuel Preparation on Cold-Start Hydrocarbon Emissions from a Spark-Ignited Engine
Sae Technical Papers
1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1996
1996-10-01
Conference paper
English
Automotive engineering | 1994
|SAE Technical Papers | 1994
|SAE Technical Papers | 1997
|Automotive engineering | 1997
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