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Fuel Properties and Engine Injection Configuration Effects on the Octane on Demand Concept for a Dual-Fuel Turbocharged Spark Ignition Engine
Technical Paper
2016-01-2307
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Efficiency of spark ignition (SI) engines is limited towards high loads by the occurrence of knock, which is linked to the octane number of the fuel. Running the engine at its optimal efficiency requires a high octane number at high load whereas a low octane number can be used at low load.
Current project aims at developing an “Octane on Demand” (OOD) concept: the fuel octane number is adjusted “on demand” to prevent knock occurrence by adapting the fuel RON injected in the combustion chamber. Thus, the engine cycle efficiency is increased by always keeping combustion phasing at optimum. This is achieved by a dual fuel injection strategy, involving a low-RON base-fuel and a high-RON octane booster. The ratio of fuel quantity on each injector is adapted to fit the RON requirement function of engine operating conditions.
This OOD concept requires a good characterization of the octane requirement needed to run the engine at its optimal efficiency over the entire map. It also involves choosing the best dual fuel combination, including a base-fuel and an octane booster to fit this concept.
To find the best fuel combination, three different octane boosters (ethanol, reformate and a blend of butanol isomers (SuperButolTM)) and two base-fuels (a very low-RON naphtha (71 RON) and a Non-Oxygenated Gasoline (NOG, 91 RON)) are tested on a test bench using an up-to-date gasoline direct plus indirect injection multicylinder engine. The way the two fuels are injected (GDI or PFI) is also investigated. Results reveal that the injection configuration has quite a low effect on the octane booster demand (to keep the engine at its optimal combustion phasing). As shown in previous work, ethanol is confirmed to be a remarkable octane booster, for its favorable sensitivity S (defined as S = RON - MON). It is also shown that the base-fuel, compared to the high octane fuel, has a weaker effect on the octane booster requirement, promoting the use of a less processed naphtha-based low-RON fuel (71) as a base-fuel.
According to 0D-simulations, about 4% CO2 savings are expected over the WLTP cycle, considering a light C sedan car powered with an up-to-date 1.6L. The more loaded the driving cycle, the larger the CO2 gains: up to 25% CO2 savings are obtained in full load conditions. Finally, work is in progress to build a complete dual fuel democar.
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Citation
Bourhis, G., Solari, J., DAUPHIN, R., and De Francqueville, L., "Fuel Properties and Engine Injection Configuration Effects on the Octane on Demand Concept for a Dual-Fuel Turbocharged Spark Ignition Engine," SAE Technical Paper 2016-01-2307, 2016, https://doi.org/10.4271/2016-01-2307.Also In
References
- ExxonMobil The Outlook for Energy: A view to 2040 2014
- International Energy Agency World Energy Outlook 2011 2011
- US Energy Information Administration International Energy Outlook DOE/EIA-0484(2013) 2013
- World Energy Council London Global Transport Scenarios 2050 2011
- Bourhis , G. , Solari , J.-P. , Morel , V. , and Dauphin , R. Using Ethanol’s Double Octane Boosting Effect with Low RON Naphtha-Based Fuel for an Octane on Demand SI Engine SAE Int. J. Engines 9 3 2016 10.4271/2016-01-0666
- Kuzuoka , K. , Kurotani , T. , Chishima , H. , and Kudo , H. Study of High-Compression-Ratio Engine Combined with an Ethanol-Gasoline Fuel Separation System SAE Int. J. Engines 7 4 1773 1780 2014 10.4271/2014-01-2614
- Partridge , R. , Weissman , W. , Ueda , T. , Iwashita , Y. et al. Onboard Gasoline Separation for Improved Vehicle Efficiency SAE Int. J. Fuels Lubr. 7 2 366 378 2014 10.4271/2014-01-1200
- Okamoto , K. , Ichikawa , T. , Saitoh , K. , Oyama , K. et al. Study of Antiknock Performance Under Various Octane Numbers and Compression Ratios in a DISI Engine SAE Technical Paper 2003-01-1804 2003 10.4271/2003-01-1804
- Nakata , K. , Uchida , D. , Ota , A. , Utsumi , S. et al. The Impact of RON on SI Engine Thermal Efficiency SAE Technical Paper 2007-01-2007 2007 10.4271/2007-01-2007
- Akihama , K. , Taki , M. , Takasu , S. , Ueda , T. et al. Fuel Octane and Composition Effects on Efficiency and Emissions in a High Compression Ratio SIDI Engine SAE Technical Paper 2004-01-1950 2004 10.4271/2004-01-1950
- 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
- Stein , R. , Polovina , D. , Roth , K. , Foster , M. et al. Effect of Heat of Vaporization, Chemical Octane, and Sensitivity on Knock Limit for Ethanol - Gasoline Blends SAE Int. J. Fuels Lubr. 5 2 823 843 2012 10.4271/2012-01-1277
- Leach , B. , Pearson , R. , Ali , R. , and Williams , J. CO2 Emission Reduction Synergies of Advanced Engine Design and Fuel Octane Number SAE Technical Paper 2014-01-2610 2014 10.4271/2014-01-2610
- Nikola Rankovic , Guillaume Bourhis , Melanie Loos , and Roland Dauphin Understanding octane number evolution for enabling alternative low RON refinery streams and octane boosters as transportation fuels Fuel 150 0 41 47 2015 10.1016/j.fuel.2015.02.005
- Bourhis G. , Solari J.P. , and Dauphin R. Measurement of RON Requirements for Turbocharged SI Engines: One Step to the Octane on Demand Concept SIA Powertrain Versailles 2015
- Marie Bedon , Misa Milosavljevic , Virginie Morel , Jean-Pascal Solari , Guillaume Bourhis , Roland Dauphin Finding the optimal engine configuration and combination of low RON base fuel / octane booster for an Octane on Demand dual-fuel engine: a simulation approach using experimental data Fuel 2016
- Morganti , K. , Abdullah , M. , Alzubail , A. , Viollet , Y. et al. Improving the Efficiency of Conventional Spark-Ignition Engines Using Octane-on-Demand Combustion. Part I: Engine Studies SAE Technical Paper 2016-01-0679 2016 10.4271/2016-01-0679
- Pilla , G. , Kumar , R. , Laget , O. , De Francqueville , L. et al. Simulation and Optical Diagnostics to Characterize Low Octane Number Dual Fuel Strategies: a Step Towards the Octane on Demand Engine SAE Technical Paper 2016-01-2164 2016
- Xu W. , Mohammad TA. , Shaik KM. , and Harale A. Method for contemporaneously dimerizing and hydrating a feed having butene US2013/0104449 A1 2013
- Xu W. , AlSHahrani FM. , Bourane A. , and Vogel S. Ralf Process for the hydration of mixed butenes to produce mixed alcohols US2014/0039226 A1 2014
- ASTM International Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel ASTM Standard D2700 2013b
- ASTM International Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel ASTM Standard D2699 2013b
- Kasseris , E. and Heywood , J. Charge Cooling Effects on Knock Limits in SI DI Engines Using Gasoline/Ethanol Blends: Part 1-Quantifying Charge Cooling SAE Technical Paper 2012-01-1275 2012 10.4271/2012-01-1275
- Kasseris , E. and Heywood , J. Charge Cooling Effects on Knock Limits in SI DI Engines Using Gasoline/Ethanol Blends: Part 2-Effective Octane Numbers SAE Int. J. Fuels Lubr. 5 2 844 854 2012 10.4271/2012-01-1284
- Whitaker , P. , Shen , Y. , Spanner , C. , Fuchs , H. et al. Development of the Combustion System for a Flexible Fuel Turbocharged Direct Injection Engine SAE Int. J. Engines 3 1 326 354 2010 10.4271/2010-01-0585
- Anderson , J. , Leone , T. , Shelby , M. , Wallington , T. et al. Octane Numbers of Ethanol-Gasoline Blends: Measurements and Novel Estimation Method from Molar Composition SAE Technical Paper 2012-01-1274 2012 10.4271/2012-01-1274
- Jung , H. , Shelby , M. , Newman , C. , and Stein , R. Effect of Ethanol on Part Load Thermal Efficiency and CO2 Emissions of SI Engines SAE Int. J. Engines 6 1 456 469 2013 10.4271/2013-01-1634
- Leone , T. , Olin , E. , Anderson , J. , Jung , H. et al. Effects of Fuel Octane Rating and Ethanol Content on Knock, Fuel Economy, and CO2 for a Turbocharged DI Engine SAE Int. J. Fuels Lubr. 7 1 9 28 2014 10.4271/2014-01-1228
- 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
- Sluder , C.S. , Szybist , J.P. , Mccormick , R.L. , Ratcliff , M.A. et al. Exploring the Relationship Between Octane Sensitivity and Heat-of-Vaporization SAE Int. J. Fuels Lubr. 9 1 80 90 2016 10.4271/2016-01-0836
- Knop , V. and Essayem , E. Comparison of PFI and DI Operation in a Downsized Gasoline Engine SAE Int. J. Engines 6 2 941 952 2013 10.4271/2013-01-1103
- Gautam Kalghatgi , Robert Head , Junseok Chang , Yoann Viollet et al. An Alternative Method Based on Toluene/n-Heptane Surrogate Fuels for Rating the Anti-Knock Quality of Practical Gasolines SAE Int. J. Fuels Lubr. 7 663 672 2014 10.4271/2014-01-2609
- Roger Cracknell , Wolfgang Warnecke , Jan-Hendrik Redmann , and Goh Tor Kit Octane Requirements of Modern Downsized Boosted Gasoline Engines MTZ 07-08 4 7 2015
- Orlebar , C. , Joedicke , A. , and Studzinski , W. The Effects of Octane, Sensitivity and K on the Performance and Fuel Economy of a Direct Injection Spark Ignition Vehicle SAE Technical Paper 2014-01-1216 2014 10.4271/2014-01-1216