This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effect of Octane on the Performance of Two Gasoline Direct Injection Passenger Cars
Technical Paper
2015-01-0767
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The performance aspect of gasoline combustion has traditionally been measured using Research Octane Number (RON) and Motor Octane Number (MON) which describe antiknock performance under different conditions. Recent literature suggests that MON is less important than RON in modern cars and a relaxation in the MON specification could improve vehicle performance, while also helping refiners in the production of gasoline. At the same time, for the same octane number change, increasing RON appears to provide more benefit to engine power and acceleration than reducing MON. It has also been suggested that there could be fuel efficiency benefits (on a tank to wheels basis) for specially adapted engines, for example, operating at higher compression ratio, on very high RON (100+). Other workers have advocated the use of an octane index (OI) which incorporates both RON and MON to give an indication of octane quality.
The objective of this study was to investigate the effect of RON and MON on the power and acceleration performance of two Euro 4 gasoline vehicles under full throttle acceleration conditions. Fifteen fuels covering RON levels 95 to 103 and sensitivities (RON minus MON) up to 15 were blended and tested. Both pure hydrocarbon and blends containing ethanol or ETBE were included so that any specific effects of oxygenates could be identified. Three additional fuels, covering RON as low as 86, were blended using primary reference fuels.
The results confirm the findings of other studies that MON is not a good predictor of vehicle performance and in fact high MON levels increase acceleration time under full throttle conditions.
Recommended Content
Authors
Topic
Citation
Stradling, R., Rickeard, D., Hamje, H., Williams, J. et al., "Effect of Octane on the Performance of Two Gasoline Direct Injection Passenger Cars," SAE Technical Paper 2015-01-0767, 2015, https://doi.org/10.4271/2015-01-0767.Also In
References
- Huber , K , Hauber , J , Raba , A and Nell , R. New Test Procedure to Determine Fuel's Knock Resistance MTZ 07-08I2013 74 62 69
- CRC Octane Group Fuel Antiknock Quality - Engine Response to RON versus MON - Scoping Tests CRC Report No. 660 May 2011
- Chow , E. , Heywood , J. , and Speth , R. Benefits of a Higher Octane Standard Gasoline for the U.S. Light-Duty Vehicle Fleet SAE Technical Paper 2014-01-1961 2014 10.4271/2014-01-1961
- CRC Review To Determine The Benefits Of Increasing Octane Number On Gasoline Engine Efficiency: Task 1Report CRC Project No. CM-137-11-1 December 2011
- CRC Review To Determine The Benefits Of Increasing Octane Number On Gasoline Engine Efficiency: Analysis And Recommendations - Tasks 2-5 CRC Project No. CM-137-11-1b September 2012
- Bisordi , A. , OudeNijeweme , D. , Bassett , M. , Stansfield , P. et al. Evaluating Synergies between Fuels and Near Term Powertrain Technologies through Vehicle Drive Cycle and Performance Simulation SAE Technical Paper 2012-01-0357 2012 10.4271/2012-01-0357
- Stansfield , P. , Bisordi , A. , OudeNijeweme , D. , Williams , J. et al. The Performance of a Modern Vehicle on a Variety of Alcohol-Gasoline Fuel Blends SAE Int. J. Fuels Lubr. 5 2 813 822 2012 10.4271/2012-01-1272
- Foong , T. , Morganti , K. , Brear , M. , da Silva , G. et al. The Effect of Charge Cooling on the RON of Ethanol/Gasoline Blends SAE Int. J. Fuels Lubr. 6 1 34 43 2013 10.4271/2013-01-0886
- Kalghatgi , G. Fuel Anti-Knock Quality - Part I. Engine Studies SAE Technical Paper 2001-01-3584 2001 10.4271/2001-01-3584
- 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 10.4271/2001-01-3585
- Kalghatgi , G. , Nakata , K. , and Mogi , K. Octane Appetite Studies in Direct Injection Spark Ignition (DISI) Engines SAE Technical Paper 2005-01-0244 2005 10.4271/2005-01-0244
- Kalghatgi , G. Auto-Ignition Quality of Practical Fuels and Implications for Fuel Requirements of Future SI and HCCI Engines SAE Technical Paper 2005-01-0239 2005 10.4271/2005-01-0239
- Mittal , V. and Heywood , J. The Relevance of Fuel RON and MON to Knock Onset in Modern SI Engines SAE Technical Paper 2008-01-2414 2008 10.4271/2008-01-2414
- Bell , A. Modern SI Engine Control Parameter Responses and Altitude Effects with Fuels of Varying Octane Sensitivity SAE Technical Paper 2010-01-1454 2010 10.4271/2010-01-1454
- Davies , T. , Cracknell , R. , Lovett , G. , Cruff , L. et al. Fuel Effects in a Boosted DISI Engine SAE Technical Paper 2011-01-1985 2011 10.4271/2011-01-1985
- Amer , A. , Babiker , H. , Chang , J. , Kalghatgi , G. et al. Fuel Effects on Knock in a Highly Boosted Direct Injection Spark Ignition Engine SAE Int. J. Fuels Lubr. 5 3 1048 1065 2012 10.4271/2012-01-1634
- Remmert , S. , Campbell , S. , Cracknell , R. , Schuetze , A. et al. Octane Appetite: The Relevance of a Lower Limit to the MON Specification in a Downsized, Highly Boosted DISI Engine SAE Int. J. Fuels Lubr. 7 3 743 755 2014 10.4271/2014-01-2718