Effect of Fuel Preparation on Cold-Start Hydrocarbon Emissions from a Spark-Ignited Engine 961957
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.
Citation: Kaiser, E., Siegl, W., Lawson, G., Connolly, F. et al., "Effect of Fuel Preparation on Cold-Start Hydrocarbon Emissions from a Spark-Ignited Engine," SAE Technical Paper 961957, 1996, https://doi.org/10.4271/961957. Download Citation
Edward W. Kaiser, Walter O. Siegl, Gerald P. Lawson, Frank T. Connolly, Carl F. Cramer, Kelvin L. Dobbins, Paul W. Roth, Michael Smokovitz
Ford Motor Co.
1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition
Outcome of the European Programme on Emissions, Fuels and Engine Technologies (Epefe)-SP-1204, Emissions Formation and In-Cylinder Control of Emissions in SI Engines-SP-1268