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Fuel Metering Effects on Hydrocarbon Emissions and Engine Stability During Cranking and Start-up in a Port Fuel Injected Spark Ignition Engine
Technical Paper
2000-01-2836
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A cycle by cycle analysis of engine behavior during the first few cycles of cranking and start-up was performed on a production four-cylinder engine. Experiments were performed to elucidate the effects of initial engine position (rest position after last engine shut-down), first and second cycle fueling, engine temperature, and spark timing on fuel delivery to the cylinder, engine-out Hydrocarbon (EOHC) emissions, and Gross Indicated Mean Effective Pressure (IMEPg). The most important effect of the piston starting position is on the first firing cycle engine rpm, which influences the IMEPg through combustion phasing. Because of the low rpm values for the first cycle, combustion is usually too advanced with typical production engine ignition timing. For both the hot start and the ambient start, the threshold for firing is at an in-cylinder air equivalence ratio (λ) of 1.1. Open-Valve Injection is detrimental to the mixture preparation process during cranking because it causes mixture non-uniformity, directly deposits fuel in the cylinder which increases EOHC, and for the ambient start, wets the spark plug which results in misfiring.
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Castaing, B., Cowart, J., and Cheng, W., "Fuel Metering Effects on Hydrocarbon Emissions and Engine Stability During Cranking and Start-up in a Port Fuel Injected Spark Ignition Engine," SAE Technical Paper 2000-01-2836, 2000, https://doi.org/10.4271/2000-01-2836.Also In
References
- Henein N.A. Tagomori M.K. Yassine M.K. Asmus T.W. Thomas C.P. Hartman P.G. “Cycle-by-Cycle Analysis of HC Emissions During Cold Start of Gasoline Engines” SAE Paper 952402 1995
- Shin, Y. Cheng, W.K. Heywood, J.B. “Liquid Gasoline Behavior in the Engine Cylinder of a SI Engine” SAE Paper 941872 1994
- Stanglmaier, R.H. Hall, M. J. Mattews, R.D. “In-Cylinder Fuel Transport during the First Cranking Cycles in a Port Injected 4-Valve Engine” SAE Paper 970043 1997
- Shayler, P.J. Issacs, R.M. Ma, T.H. “The Variation of In-Cylinder Mixture Ratios during Engine Cranking at Low Ambient Temperatures” Proc. Inst. Mech. Engrs. 206 55 62 1992
- Morishima, R. Asai, K “Mixture Strength at Cranking Cycles of Gasoline Engine Starting,” SAE Paper 920235 1992
- Takeda, K. Yaegashi, T. Sekiguchi, K. Sakito, K. Imatake, N. “Mixture Preparatin and HC Emissions of a 4-Valve Engine with Port Fuel Injection During Cold Starting and Warm-up” SAE Trans. 104 3 88 94 Paper 950074 1995
- Imatake, N. Saito, K. Morishima, S. Kudo, S. Ohhata, A. “Quantitative Analysis of Fuel Behavior in Port-Injection Gasoline Engines,” SAE Trans. 106 3 1779 1789 Paper 971639 1997
- Cheng W.K. Summers T. Collings N. “The Fast-Response Flame Ionization Detector,” Prog. Energy Combustion Science 24 89 124 1998
- Cowart, J.S. Cheng, W.K. “Throttle Movement Rate Effects on Transient Fuel Compensation in a Port-Fuel-Injected SI Engine” SAE Paper 2000-01-1937 2000
- Min, K.D. Cheng, W. K. Heywood, J. B. “The Effects of Crevices on the Engine-Out Hydrocarbon Emissions in SI Engines” SAE Paper 940306 1994
- Chun, K.M. Heywood, J.B. “Estimating Heat Release and Mass of Mixture Burned from Spark Ignition Engine Pressure Data,” Combustion Science and Technology 54 134 143 1987
- Heywood, J. B. Internal Combustion Engine Fundamentals McGraw-Hill 1987
- Witze, P.O. Green, R.M. “LIF and Flame-Emission Imaging of Liquid Fuel Films and Pool Fires in an SI Engine Durngin a Simulated Cold Start,” SAE Trans. 106 3 Paper 970866 1291 1305 1997
- Cheng W.K. Hamrin D. Heywood J.B. Hochgreb S. Min K.D. Norris M. “An Overview of Hydrocarbon Emissions Mechanisms in Spark-Ignition Engines,” SAE Transaction 102 Paper 932708 1207 1220 1993
- Obert, E. Internal Combustion Engines and Air Pollution Hrper and Row 1973