This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Flex Fuel Engine - Influence of Fuel Composition on the CA50 at Maximum Brake Torque Condition
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 22, 2015 by SAE International in United States
Annotation ability available
The automotive industry usually adopts the crankshaft angle between 8° and 10° after piston top dead center for the CA50 (crank angle of 50% of mass fraction burned) in order to set the maximum break torque spark timing calibration in Otto cycle engines. There are few studies of the influence of fuel composition, such as the ethanol content, on the CA50 at the maximum torque operating condition. The subject is relevant to the extent that the fuels used in the Brazilian domestic market are different from those usually adopted abroad. The Brazilian gasoline must contain, by law, a volumetric percentage between 18% and 27% of anhydrous ethanol in its composition and, currently, this level is set at 27%. The introduction of flex fuel vehicles in the domestic market in 2003, which now represent most of the new vehicles production in the Country, allowed the use of any blend of national gasoline and hydrous ethanol. This significantly expanded the range of fuel properties variation. This fuel flexibility influences the design, calibration and efficiency of internal combustion engines. The present work is a study to assess more information on the influence of different fuels on the CA50 at maximum break torque spark timing calibration. This knowledge may help in researches related to the development of fuels, internal combustion engines and in the search for greater engine efficiencies, using different fuels.
CitationMachado, G., de Melo, T., and de Mendonça Soares, L., "Flex Fuel Engine - Influence of Fuel Composition on the CA50 at Maximum Brake Torque Condition," SAE Technical Paper 2015-36-0215, 2015, https://doi.org/10.4271/2015-36-0215.
- Heywood J.B. Internal combustion engine fundamentals McGraw Hill Inc. U.S.A. 1988
- Prucka , R.G. An Experimental Characterization of a High Degree of Freedom Spark-Ignition Engine to Achieve Optimized Ignition Timing Control” PhD Dissertation Department of Mechanical Engineering, University of Michigan Michigan 2008
- Machado G.B. Metodologias para desenvolvimento de combustíveis e determinação da velocidade de propagação de chama em motores de ignição por centelha D.Sc. Thesis Department of Mechanical Engineering PUC-Rio Rio de Janeiro 2012
- Guoming G.Z. , Chao F.D. , James W. MBT Timing Detection and its Closed-Loop Control Using In-Cylinder Pressure Signal SAE Paper 2003-01-3266 2003 10.4271/2003-01-3266
- Guoming G.Z. , Chao F.D. , James W. MBT Timing Detection and its Closed-Loop Control Using In-Cylinder Ionization Signal SAE Paper 2004-01-2976 2004 10.4271/2004-01-2976
- Magnusson J. An Investigation of Maximum Brake Torque Timing based on Ionization Current Feedback Master Thesis Dept. of Electrical Engineering, Linköping University Linköping 2007
- Carvalho L.O. , Melo T.C.C. , Neto R.M.A.C. Investigation on the Fuel and Engine Parameters that Affect the Half Mass Fraction Burned (CA50) Optimum Crank Angle SAE Paper 2012-36-0498 2012 10.4271/2012-36-0498
- Pitz W.J. , Cernansky N.P. , Dryer F.L. , Egolfopoulos F.N. , Farrell J.T. , Friend D.G. , Pitsch H. Development of an Experimental Database and Chemical Kinetic Models for Surrogate Gasoline Fuels SAE Paper 2007-01-0175 2007 10.4271/2007-01-0175
- Machado G.B. , Barros J.E.M. , Braga S.L. , Braga C.V.M. Influence of gasoline components on engine efficiency and emissions Oil Gas Sci. Technol. 2014 10.2516/ogst/2013187
- Machado G.B. , Barros J.E.M. , Braga S.L. , Braga C.V.M. , Oliveira E.J. , Silva A.H.M.F.T. , Carvalho L.O. Investigations on surrogate fuels for high octane oxygenated gasolines Fuel 90 2 2011 640 646
- Farrell J.T. , Johnston R.J. , Androulakis I.P. Molecular structure effects on laminar burning velocities at elevated temperature and pressure SAE Paper 2004-01-2936 2004 10.4271/2004-01-2936
- AVL AVL IndiCom - Advanced combustion analysis software, version 2.1 Graz, Austria 2009