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Fuel Anti-Knock Quality- Part II. Vehicle Studies - How Relevant is Motor Octane Number (MON) in Modern Engines?
Technical Paper
2001-01-3585
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2002 World Congress & Exhibition
SAE International Fall Fuels & Lubricants Meeting & Exhibition
Language:
English
Abstract
The effect of fuel anti-knock quality on power and acceleration performance is studied in twenty-three European and Japanese cars equipped with knock sensors. The anti-knock quality of a fuel in a given car and operating condition is defined by its octane index OI = RON - KS where K is a constant for that condition and S is the sensitivity, (RON-MON), and RON and MON are the Research and Motor Octane numbers respectively. The higher the octane index, the better the antiknock quality of the fuel and the better the power and acceleration performance. K is often assumed to be 0.5 so that OI =(RON+MON)/2. However, it is found that in most cases considered here, K is negative so that for a given RON, a fuel with higher sensitivity (lower MON) has better anti-knock quality and better performance. Even when K is not negative it has a small (< 0.2) positive value so that MON contributes much less to fuel anti-knock quality than generally assumed.
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Authors
Citation
Kalghatgi, G., "Fuel Anti-Knock Quality- Part II. Vehicle Studies - How Relevant is Motor Octane Number (MON) in Modern Engines?," SAE Technical Paper 2001-01-3585, 2001, https://doi.org/10.4271/2001-01-3585.Also In
References
- McNally, M.J. Callison, J.C. Evans, B. Graham, J.P. Swaynos, D.V. Uihlein, J.P. Wusz, T. “ The effect of gasoline octane quality on vehicle acceleration performance - A CRC study” SAE Paper# 912304 1991
- 1995
- Whelan, D.E. Schmidt, G.K. Hischier, M.E. “ An acceleration based method to determine the octane number requirement of knock sensor vehicles” SAE Paper# 982721 1998
- Sugawara, Y. Akasaka, Y. Kagami, M. “ Effects of gasoline properties on acceleration performance of commercial vehicles.” SAE Paper No. 971725 1997
- Kalghatgi, G.T. “ Fuel anti-knock quality - Part I, Engine Studies” SAE Paper# 2001-01-3584 2001
- Leppard, W.R. “ The chemical origin of fuel octane sensitivity” SAE Paper# 902137 1990
- Bradley, D. Morley, C. “ Autoignition in spark-ignition engines” 1997
- Bell, A.G. “ The relationship between octane quality and octane requirement” SAE Paper# 750935 1975