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A Method of Predicting Brake Specific Fuel Consumption Maps
Technical Paper
1999-01-0556
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A method of predicting brake specific fuel consumption characteristics from limited specifications of engine design has been investigated. For spark ignition engines operating on homogeneous mixtures, indicated specific fuel consumption based on gross indicated power is related to compression ratio and spark timing relative to optimum values. The influence of burn rate is approximately accounted for by the differences in spark timings required to correctly phase combustion. Data from engines of contemporary design shows that indicated specific fuel consumption can be defined as a generic function of relative spark timing, mixture air/fuel ratio and exhaust gas recirculation rate. The additional information required to generate brake specific performance maps is cylinder volumetric efficiency, rubbing friction, auxiliary loads, and exhaust back pressure characteristics. A closed set of equations is developed and the method solution presented together with illustrative results showing good agreement between predictions and experimental data. The effects of engine design and calibration settings are investigated.
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Citation
Shayler, P., Chick, J., and Eade, D., "A Method of Predicting Brake Specific Fuel Consumption Maps," SAE Technical Paper 1999-01-0556, 1999, https://doi.org/10.4271/1999-01-0556.Also In
References
- Heywood J.B. Internal Combustion Engine Fundamentals McGraw-Hill 1988
- Matthews R.D. Shizghi M. Combustion Efficiency of Spark Ignition Engines Int.J. of Vehicle Design 8 3 345 354 1987
- Ferguson C.R. Internal Combustion Engines John Wiley & Sons 1986
- Patton K.J. Nitschke R.G. Heywood J.B. Development and Evaluation of a Friction Model for Spark Ignition Engines SAE Paper 890836 1989
- Shayler P.J. Christian S.J. Ma T. A Model for the Investigation of Temperature, Heat Flow and Friction Characteristics During Engine Warm-up SAE Paper 931153 1993
- Taylor C.F. The Internal Combustion Engine in Theory and Practice, Volume 1: Thermodynamics, Fluid Flow, Performance MIT Press 2nd 1985
- Menne R.J. Heusser G. Morris G.D. Potential of the new Ford Zetec-SE Engine to Meet Future Emission Standards International Seminar on Application of Power-train and Fuel Technologies to Meet Emissions Standards June 1996
- Reilly D.J. Anderson R.P Casparian R.J. Dugdale P.H. Saturn DOHC and SOHC Four Cylinder Engines SAE Paper 910676 1991
- Shayler P.J. Chick J.P. Hayden D.J. Yuen H.C.R. Ma T. Progress on Modelling Engine Thermal Behaviour for VTMS Applications SAE Paper 971852 1997