This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Effect of Oil Intrusion on Super Knock in Gasoline Engine
Technical Paper
2014-01-1224
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Super knock which occurs in highly boosted spark ignition engines in low speed pre-ignition regime can lead to severe engine damage. However, super knock occurs occasionally, it is difficult to clearly identify the causes. The widely accepted assumption for the cause of this phenomenon is oil intrusion. Most of oils have been proved to have higher cetane number than n-heptane dose, indicating that the intruded oil is very liable to auto-ignition in a boosted engine. Although there have been reported the type of base oil and additive has significant effect on pre-ignition frequency, the oil induced super knock is still so far not supported by any direct evidence.
This paper presents the effect of direct oil intrusion into cylinder on super knock. The experiment was carried out in a single cylinder engine. The diluted oil by gasoline with different ratio was directly injected into cylinder using a modified single-hole injector with 4MPa injection pressure. The results showed that oil intrusion before TDC could indeed induce pre-ignition then cause knock. The effect of oil injection timing on knock intensity varies with oil injection quantity and dilution ratio. For the same dilution ratio, more oil intrusion leads to more severe knock. The slightly diluted oil (75% oil + 25% gasoline, for example) causes the heaviest knock.
Recommended Content
Authors
Citation
Qi, Y., Xu, Y., Wang, Z., and Wang, J., "The Effect of Oil Intrusion on Super Knock in Gasoline Engine," SAE Technical Paper 2014-01-1224, 2014, https://doi.org/10.4271/2014-01-1224.Also In
References
- Willand J , Daniel M , Montefrancesco E et al. Limits on downsizing in spark ignition engines due to pre-ignition MTZ worldwide 2009 70 5 56 61
- 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
- Dahnz C , Spicher U. Irregular combustion in supercharged spark ignition engines - pre-ignition and other phenomena International Journal of Engine Research 2010 11 6 485 498
- 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
- Amann , M. , Alger , T. , Westmoreland , B. , and Rothmaier , A. The Effects of Piston Crevices and Injection Strategy on Low-Speed Pre-Ignition in Boosted SI Engines SAE Int. J. Engines 5 3 1216 1228 2012 10.4271/2012-01-1148
- 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
- Rudloff J , Zaccardi J M , Richard S et al. Analysis of pre-ignition in highly charged SI engines: Emphasis on the auto-ignition mode Proceedings of the Combustion Institute 2013 34 2 2959 2967
- Kalghatgi G T , Bradley D. Pre-ignition and ‘super-knock’ in turbo-charged spark-ignition engines International Journal of Engine Research 2012 13 4 399 414
- Zhang Z. Research on Pre-ignition and Oil Dilution of Turbocharged GDI Engine Doctor dissertation Tianjin Tianjin University 2012
- Konig , G. and Sheppard , C. End Gas Autoignition and Knock in a Spark Ignition Engine SAE Technical Paper 902135 1990 10.4271/902135