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Impact of Lubricant Composition on Low-speed Pre-Ignition
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
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One of the limits on the maximum fuel efficiency benefit to be gained from turbocharged, downsized gasoline engines is the occurrence of pre-ignitions at low engine speed. These pre-ignitions may lead to high pressures and extreme knock (megaknock or superknock) which can cause severe engine damage. Though the mechanism leading to megaknock is not completely resolved, pre-ignitions are thought to arise from local autoignition of areas in the cylinder which are rich in low ignition delay “contaminants” such as engine oil and/or heavy ends of gasoline. These contaminants are introduced to the combustion chamber at various points in the engine cycle (e.g. entering from the top land crevice during blow-down or washed from the cylinder walls during DI wall impingement).
This paper presents results from tests in which model “contaminants”, consisting of engine lubricant base stocks, base stocks mixed with fuel and base stocks mixed with one or more additives were injected directly into a test engine to determine their propensity to ignite. The ignition tendency was found to be lower for less reactive base stocks and for base stocks mixed with certain additives. Further, when small amounts of fuel were mixed with relatively non-ignitive lubricant base stocks the ignition tendency was found to increase significantly. These results may guide development of new lubricants which could be used to reduce megaknock in downsized engines.
CitationWelling, O., Collings, N., Williams, J., and Moss, J., "Impact of Lubricant Composition on Low-speed Pre-Ignition," SAE Technical Paper 2014-01-1213, 2014, https://doi.org/10.4271/2014-01-1213.
- Bandel , W. , Fraidl , G. , Kapus , P. , Sikinger , H. et al. The Turbocharged GDI Engine: Boosted Synergies for High Fuel Economy Plus Ultra-low Emission SAE Technical Paper 2006-01-1266 2006 10.4271/2006-01-1266
- Zaccardi , J. , Pagot , A. , Vangraefschepe , F. , Dognin , C. et al. Optimal Design for a Highly Downsized Gasoline Engine SAE Technical Paper 2009-01-1794 2009 10.4271/2009-01-1794
- Vangraefschèpe , F. , and Zaccardi , J.M. Analysis of destructive abnormal combustions appearing at high load and low engine speed on high performance gasoline engines SIA Strasbourg 2007
- Fraser , N. , Blaxill , H. , Lumsden , G. , and Bassett , M. Challenges for Increased Efficiency through Gasoline Engine Downsizing SAE Int. J. Engines 2 1 991 1008 2009 10.4271/2009-01-1053
- Manz , P. , Daniel , M. , Jippa , K. , and Willand , J. Pre-ignition in highly-charged turbocharged engines, analysis procedure and results 8th International Symposium on Combustion Diagnostics 2008
- Zaccardi , J. , Duval , L. , and Pagot , A. Development of Specific Tools for Analysis and Quantification of Pre-ignition in a Boosted SI Engine SAE Int. J. Engines 2 1 1587 1600 2009 10.4271/2009-01-1795
- Willand , J. , Daniel , M. , Montefrancesco , E. , Geringer , B. et al. Limits on Downsizing in Spark Ignition Engines due to Pre-ignition MTZ Worldwide 56 2009
- Haenel , P. , Seyfried , P. , Kleeberg , H. , and Tomazic , D. Systematic Approach to Analyze and Characterize Pre-ignition Events in Turbocharged Direct-injected Gasoline Engines SAE Technical Paper 2011-01-0343 2011 10.4271/2011-01-0343
- Amann , M. , Alger , T. , and Mehta , D. The Effect of EGR on Low-Speed Pre-Ignition in Boosted SI Engines SAE Int. J. Engines 4 1 235 245 2011 10.4271/2011-01-0339
- Zahdeh , A. , Rothenberger , P. , and Schäfer J. Diagnosing engine combustion using high speed photography in conjunction with CFD Baden-Baden 2008
- Dahnz , C. , Han , K. , Spicher , U. , Magar , M. et al. Investigations on Pre-Ignition in Highly Supercharged SI Engines SAE Int. J. Engines 3 1 214 224 2010 10.4271/2010-01-0355
- Kalghatgi , G. , Bradley , D. , Andrae , J. , and Harrison , A. The nature of ‘superknock’ and its origins in SI engines I.Mech.E Conference on Internal combustion engines: Performance, Fuel Economy and Emissions London 2009
- Zahdeh , A. , Rothenberger , P. , Nguyen , W. , Anbarasu , M. et al. Fundamental Approach to Investigate Pre-Ignition in Boosted SI Engines SAE Int. J. Engines 4 1 246 273 2011 10.4271/2011-01-0340
- Welling , O. , Collings , N. , Williams , J. , and Moss , J. Measuring the Impact of Engine Oils and Fuels on Low-Speed Pre-Ignition in Downsized Engines SAE Technical Paper, 14PFL-0351
- API 1609 Engine Oil Licensing and Certification System 19th 2012
- Wagner , A. , Schönecker , M. , Spelsberg-Korspeter , G. , and Hagedorn , P. On Criteria for the Robust Design of Squeal Free Brakes SAE Technical Paper 2012-01-1816 2012 10.4271/2012-01-1816
- Peyton K. Odeo/Nalco Fuel Field Manual McGraw-Hill 2002 0-07-138786-2
- Amann , M. and Alger , T. Lubricant Reactivity Effects on Gasoline Spark Ignition Engine Knock SAE Int. J. Fuels Lubr. 5 2 760 771 2012 10.4271/2012-01-1140
- Sagawa , T. , Fujimoto , H. , and Nakamura , K. Study of Fuel Dilution in Direct-Injection and Multipoint Injection Gasoline Engines SAE Technical Paper 2002-01-1647 2002 10.4271/2002-01-1647
- Saville , S. , Gainey , F. , Cupples , S. , Fox , M. et al. A Study of Lubricant Condition in the Piston Ring Zone of Single-Cylinder Diesel Engines Under Typical Operating Conditions SAE Technical Paper 881586 1988 10.4271/881586