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Controlling Low-Speed Pre-Ignition in Modern Automotive Equipment: Defining Approaches to and Methods for Analyzing Data in New Studies of Lubricant and Fuel-Related Effects (Part 2)
Technical Paper
2016-01-0716
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In recent years, an abnormal combustion phenomenon called low-speed pre-ignition (LSPI) has arisen from the downsizing of gasoline engines in order to improve fuel economy and comply with global CO2 legislation. The type and quality of the fuel and lubricant has been found to influence LSPI occurrence rates. A methodology for studying LSPI has been implemented, and a rigorous statistical approach for studying the data from a stationary engine test can provide consistent results as shown in Part 1 of the series.
LSPI events can be determined by an iterative statistical procedure based on calculating the mean and standard deviation of peak pressure (PP) and crank angle location of 2% mass fraction burned (MFB02) data, determining cycles with parameters which exceeded n standard deviations from the mean and identifying outliers. Outliers for the PP and MFB02 metrics are identified as possible LSPI events.
Further investigation was conducted to refine the approaches and methods used for analyzing data. This paper expands on some of the methodology described in Part 1 and explores the assumption of normal distribution that is used to determine the number of standard deviations beyond which correspond to outliers. The application of a method for adjusting departure from normality in terms of skewness and kurtosis is explored to reduce the frequency of false positives and negatives.
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Boese, D., Ritchie, A., and Young, A., "Controlling Low-Speed Pre-Ignition in Modern Automotive Equipment: Defining Approaches to and Methods for Analyzing Data in New Studies of Lubricant and Fuel-Related Effects (Part 2)," SAE Technical Paper 2016-01-0716, 2016, https://doi.org/10.4271/2016-01-0716.Also In
References
- Welling , O. , Collings , N. , Williams , J. , and Moss , J. Impact of Lubricant Composition on Low-speed Pre-Ignition SAE Technical Paper 2014-01-1213 2014 10.4271/2014-01-1213
- Dingle , S. , Cairns , A. , Zhao , H. , Williams , J. et al. Lubricant Induced Pre-Ignition in an Optical SI Engine SAE Technical Paper 2014-01-1222 2014 10.4271/2014-01-1222
- Boese , D. , Ritchie , A. and Young , A. Controlling low-speed pre-ignition in modern automotive equipment. Part 3: Identification of key additive component types and other lubricant composition effects on low-speed pre-ignition Presentation at SAE World Congress USA April 12-14, 2016
- Takeuchi , K. , Fujimoto , K. , Hirano , S. , and Yamashita , M. Investigation of Engine Oil Effect on Abnormal Combustion in Turbocharged Direct Injection - Spark Ignition Engines SAE Int. J. Fuels Lubr 5 3 1017 1024 2012 10.4271/2012-01-1615
- Hirano , S. , Yamashita , M. , Fujimoto , K. , and Kato , K. Investigation of Engine Oil Effect on Abnormal Combustion in Turbocharged Direct Injection - Spark Ignition Engines (Part 2) SAE Technical Paper 2013-01-2569 2013 10.4271/2013-01-2569
- Fujimoto , K. , Yamashita , M. , Hirano , S. , Kato , K. et al. Engine Oil Development for Preventing Pre-Ignition in Turbocharged Gasoline Engine SAE Int. J. Fuels Lubr 7 3 869 874 2014 10.4271/2014-01-2785
- Tamura , K. , Utaka , T. , Kamano , H. , Hayakawa , N. et al. Abnormal Combustion Induced by Combustion Chamber Deposits Derived from Engine Oil Additives in a Spark-Ignited Engine SAE Int. J. Engines 8 1 200 205 2015 10.4271/2014-32-0091
- Boese , D. and Ritchie , A. Controlling low-speed pre-ignition in modern automotive equipment: Defining approaches to and methods for analyzing data in new studies of lubricant-and fuel-related effects Presentation at 20th International Colloquium Tribology Germany January 12-14, 2016
- Glugla , C. and Mancini , M. Method and System for Pre-Ignition Control US 8775055 B2 July 8 2014
- Binder , D. and Dearth , M. Engine-Lubricant Octane Boost to Quiet Sporadic Pre-Ignition US 2014/016594 A1 June 19 2014
- Fleishman , A. A Method for simulating non-normal distributions Psychometrika 43 4 520 532 1978 http://dx.doi.org/10.1007/BF02293811