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Effects of In-Cylinder Fuel Spray Formation on Emissions and Cyclic Variability in a Lean-Burn Engine. Part 2: Results
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The effects of injection system design, air/fuel ratio, coolant temperature and fuel volatility on engine-out hydrocarbon emissions, NOx emissions and cyclic variability have been studied in a prototype 1.8l lean-burn SI engine. The results have been compared with ILIDS measurements of in-cylinder spray characteristics made under similar conditions, to establish the degree to which variations in fuel spray formation affect engine performance. The engine was found to exhibit a different behaviour when running lean compared to stoichiometric. In lean-burn operation, there was a clear tendency for the best performance to occur under operating conditions which produced charge stratification in the cylinder, whereas when the engine was run with a stoichiometric air/fuel ratio, the best performance was achieved under engine operating conditions which gave the most homogeneous charge in-cylinder. The main effects of increasing mid-range or back-end fuel volatility were to increase evaporation from the inlet port wall film, thereby reducing the contribution made by strip atomisation to the overall in-cylinder droplet population early in the intake stroke. The optimum fuel system for lean-burn operation was the combination of an air-assisted injector used with back-flow injection timing.
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Skippon, S. and Takagi, Y., "Effects of In-Cylinder Fuel Spray Formation on Emissions and Cyclic Variability in a Lean-Burn Engine. Part 2: Results," SAE Technical Paper 982620, 1998, https://doi.org/10.4271/982620.Also In
References
- Yamaguchi L. “Nissan's lean burn engine powers Sunny sedan.” Automotive Engineering 101 12 13 1994
- Yamaguchi J. “Toyota's Third Generation Lean Burn Engine,” Automotive Engineering 100 66 67 1992
- Yamaguchi J. “Mazda three-way catalyst for lean-burn engines,” Automotive Engineering 101 11 12 13 1993
- Tabata M. Yamamoto T. Fukube T. “Improving NO x and fuel economy for mixture injected SI engine with EGR,” SAE Paper No. 950684 1995
- Tabata M. Motoshi K. Fujimoto M. Noh Y. “In-cylinder fuel distribution, flow field, combustion characteristics of a mixture injected SI engine,” SAE Paper No. 950104 1995
- Yu C. Kim T. Yi Y. Lee E.J. Noh S. Choi K. “Development of KMC 2.4L lean burn engine,” SAE Paper No. 950685 1995
- Miyoshi N. et al “Development of new concept Three-Way-Catalyst for automotive lean burn engines,” SAE Paper no. 950809 1995
- Glover A.R. Skippon S.M. Boyle R.D. “Interferometric Laser Imaging for Droplet Sizing (ILIDS): A Method for Droplet Size Measurement in Sparse Spray Systems,” Appl. Opt. 34 36 8409 8421 1995
- Skippon S.M. Glover A.R. Cooney P.J. Boyle R.D. “Studies of mixture preparation in a spark ignition engine using Interferometric Laser Imaging for Droplet Sizing (ILIDS),” SAE Paper no. 950457 1995
- Takagi Y. Skippon S.M. “Effects of in-cylinder fuel spray formation on emissions and cyclic variability in a len-burn engine. Part 1: Background and methodology,” SAE Paper no. 982618 1998
- Shin Y. Cheng W.K. Heywood J.B. “Liquid gasoline behavior in the engine cylinder of a SI engine,” SAE Paper no. 941872 1994
- Naitoh Takagi Y. Kokita H. Kuwahara K. “Numerical Prediction of Fuel Secondary Atomization Behaviour in SI Engines based on the Oval-Parabola Trajectories (OPT) Model,” SAE Paper no. 940526 1994
- Takeda K. Yaegashi T. Sekiguchi K. Saito K. Imatake N. “Mixture preparation and HC emissions of a 4-valve engine with port fuel injection during cold starting and warm-up,” SAE Paper No. 950074 1995
- Quader, A.A. “How injector, engine and fuel variables impact smoke and hydrocarbon emissions with port fuel injection,” SAE Paper no. 890623 1989
- Saito K. Sekiguschi K. Imatake N. Takeda K. Yaegashi T. “A new method to analyze fuel behavior in a spark ignition engine,” SAE Paper No. 950044 1995
- Skippon Norton D. “The effects of gasoline volatility on mass and composition of the inlet port wall film in port injected SI engines,” SAE Paper No. 982517 1998
- Lefebvre “Atomization and Sprays,” 1st Hemisphere New York 1989 0-89116-603-3
- Skippon Tagaki Y. “ILIDS measurements of the evaporation of fuel droplets during the intake and compression strokes in a firing lean burn engine,” SAE Paper no. 960830 1996
- Goodfellow, C.L. Gorse, R.A. Hawkins, M.J. McArrangher, J.S. “European Programme on Emissions, Fuels and Engine Technologies (EPEFE) - gasoline aromatics/E100 study,” SAE Paper no. 961072 1996