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Increasing EGR Tolerance using High Tumble in a Modern GTDI Engine for Improved Low-Speed Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 08, 2013 by SAE International in United States
Annotation ability available
Engine downsizing and downspeeding using GTDI technology improves fuel economy while maintaining vehicle performance. The downsizing potential of an engine application is limited by engine knock at low engine speeds as well as turbocharger inlet and catalyst temperatures at high speeds, requiring high spark retard and fuel enrichment, respectively. Both spark retard and fuel enrichment reduce the overall real world fuel economy benefit. Cooled exhaust gas recirculation (EGR) has been investigated as a way of reducing knock and lowering exhaust gas temperatures.
This paper discusses the use of low-pressure route cooled EGR for knock mitigation at low engine speeds in order to improve full load performance and fuel consumption and increase the potential for engine downsizing. In particular, this study focuses on increasing the EGR tolerance of the combustion system through the use of very high tumble ratios exceeding that of current production systems, enhanced ignition and increased compression ratio. An externally boosted single cylinder research engine is used to investigate the effects of these various concepts on the EGR tolerance and the subsequent effects on low speed, full-load engine performance and fuel consumption. Computational fluid dynamics (CFD) is used to understand the mixture preparation and turbulence differences expected when using high tumble intake ports.
A high tumble combustion system was found to provide high EGR dilution tolerance, improved thermal efficiency and higher load capability through advancement of the knock limited combustion phasing. However, extremely high tumble ratios were found to increase the knocking tendency of the engine.
CitationWheeler, J., Polovina, D., Ramanathan, S., Roth, K. et al., "Increasing EGR Tolerance using High Tumble in a Modern GTDI Engine for Improved Low-Speed Performance," SAE Technical Paper 2013-01-1123, 2013, https://doi.org/10.4271/2013-01-1123.
- Lake , T. , Stokes , J. , Murphy , R. , Osborne , R. et al. Turbocharging Concepts for Downsized DI Gasoline Engines SAE Technical Paper 2004-01-0036 2004 10.4271/2004-01-0036
- Anderson , W. , Yang , J. , Brehob , D. , Vallance , J. et al. Understanding the Thermodynamics of Direct Injection Spark Ignition (DISI) Combustion Systems: An Analytical and Experimental Investigation SAE Technical Paper 962018 1996 10.4271/962018
- Duchaussoy , Y. , Lefebvre , A. , and Bonetto , R. Dilution Interest on Turbocharged SI Engine Combustion SAE Technical Paper 2003-01-0629 2003 10.4271/2003-01-0629
- Cairns , A. , Blaxill , H. , and Irlam , G. Exhaust Gas Recirculation for Improved Part and Full Load Fuel Economy in a Turbocharged Gasoline Engine SAE Technical Paper 2006-01-0047 2006 10.4271/2006-01-0047
- Iwamoto , Y. , Noma , K. , Nakayama , O. , Yamauchi , T. et al. Development of Gasoline Direct Injection Engine SAE Technical Paper 970541 1997 10.4271/970541
- Kuwahara , K. , Ueda , K. , and Ando , H. Mixing Control Strategy for Engine Performance Improvement in a Gasoline Direct Injection Engine SAE Technical Paper 980158 1998 10.4271/980158
- Lumsden , G. , Eddleston , D. , and Sykes , R. Comparing Lean Burn and EGR SAE Technical Paper 970505 1997 10.4271/970505
- Neame , G. , Gardiner , D. , Mallory , R. , Rao , V. et al. Improving the Fuel Economy of Stoichiometrically Fuelled S.I. Engines by Means of EGR and Enhanced Ignition - A Comparison of Gasoline, Methanol and Natural Gas SAE Technical Paper 952376 1995 10.4271/952376
- Tabata , M. , Yamamoto , T. , and Fukube , T. Improving NOx and Fuel Economy for Mixture Injected SI Engine with EGR SAE Technical Paper 950684 1995 10.4271/950684
- Brustle , C. and Hemmerlein , N. Exhaust Gas Turbocharged SI engines and their Ability of Meeting Future Demands IMechE Paper No. C484/039/94 1994
- Liang , L. , Reitz , R. , Iyer , C. , and Yi , J. Modeling Knock in Spark-Ignition Engines Using a G-equation Combustion Model Incorporating Detailed Chemical Kinetics SAE Technical Paper 2007-01-0165 2007 10.4271/2007-01-0165
- Alger , T. , Chauvet , T. , and Dimitrova , Z. Synergies between High EGR Operation and GDI Systems SAE Int. J. Engines 1 1 101 114 2009 10.4271/2008-01-0134
- Alger , T. , Hanhe , S. , Roberts , C. , and Ryan , T. The Heavy Duty Gasoline Engine - A Multi-Cylinder Study of a High Efficiency, Low Emission Technology SAE Technical Paper 2005-01-1135 2005 10.4271/2005-01-1135
- Potteau , S. , Lutz , P. , Leroux , S. , Moroz , S. et al. Cooled EGR for a Turbo SI Engine to Reduce Knocking and Fuel Consumption SAE Technical Paper 2007-01-3978 2007 10.4271/2007-01-3978
- Cairns , A. , Fraser , N. , and Blaxill , H. Pre Versus Post Compressor Supply of Cooled EGR for Full Load Fuel Economy in Turbocharged Gasoline Engines SAE Technical Paper 2008-01-0425 2008 10.4271/2008-01-0425
- Alger , T. , Gingrich , J. , and Mangold , B. The Effect of Hydrogen Enrichment on EGR Tolerance in Spark Ignited Engines SAE Technical Paper 2007-01-0475 2007 10.4271/2007-01-0475
- Alger , T. , Gingrich , J. , Mangold , B. , and Roberts , C. A Continuous Discharge Ignition System for EGR Limit Extension in SI Engines SAE Int. J. Engines 4 1 677 692 2011 10.4271/2011-01-0661
- Berntsson , A. , Josefsson , G. , Ekdahl , R. , Ogink , R. et al. The Effect of Tumble Flow on Efficiency for a Direct Injected Turbocharged Downsized Gasoline Engine SAE Int. J. Engines 4 2 2298 2311 2011 10.4271/2011-24-0054
- Heywood , J.B. Internal Combustion Engine Fundamentals McGraw-Hill 1988
- Livengood J. C. , and Wu P. C. Correlation of Auto-ignition Phenomenon in Internal Combustion Engines and Rapid Compression Machines 5th Symposium (International) on Combustion The Combustion Institute 347 356 1955
- Warnatz J. , Maas U. , and Dibble R. W. Combustion: Physical And Chemical Fundamentals, Modeling And Simulation, Experiments, Pollutant Formation Springer 2006
- Whitaker , P. , Shen , Y. , Spanner , C. , Fuchs , H. et al. Development of the Combustion System for a Flexible Fuel Turbocharged Direct Injection Engine SAE Int. J. Engines 3 1 326 354 2010 10.4271/2010-01-0585
- FIRE v2009 Manual AVL List GmbH Graz 2009