This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Research on Extended Expansion General-Purpose Engine - Heat Release and Friction -
Published October 30, 2007 by Society of Automotive Engineers of Japan in Japan
Annotation ability available
The combustion and efficiency of an extended expansion general-purpose engine employing a multiple linkage system with that of a conventional engine consisting of the same component parts, with the exception of the linkage system. The results show that this extended expansion increases indicated thermal efficiency from 29.6% to 33.2%. In addition, as the piston speed near the compression top dead center of this engine is slow, mass fraction burned depends upon the change in the cylinder volume, relative to the combustion chamber volume during the combustion period. The change of the minimum spark advance for best torque (MBT) timing relative to load is smaller than that of the conventional engine. In addition, measurements of drive loss during motoring operation show that the friction of this engine is approximately the same as that of a conventional engine. As a result, brake thermal efficiency of the test engine was increased by approximately 13%, from 20.1% of the conventional engine to 22.7%, under the EPA mode with fixed ignition timing operation.
CitationKOGA, H. and WATANABE, S., "Research on Extended Expansion General-Purpose Engine - Heat Release and Friction -," SAE Technical Paper 2007-32-0003, 2007.
- A Watanabe, S. Koga, H. Kono, S. Research on Extended Expansion General-Purpose Engine Theoretical Analysis of Multiple Linkage System and Improvement of Thermal Efficiency SAEpaper 2006-32-0101
- Heywood, J. B. Internal Combustion Engine Fundamentals 47 50 1988
- Hatta, K. Asanuma, T. Matsuki, M. Nainen Kikan Keisoku Handbook Asakura Publishing 323 325 1979
- Environmental Protection Agency: Title 40 CFR, Part 90, Subpart E 219 247 2000
- Pouliot, H. N. Delameter, W. R. Robinson, C. W. A Variable-Displacement Spark-Ignition Engine SAE Paper, 770114 1977
- Miwa, K. Kidoguchi, Y. Mohammadi, A. A Study on a New Combustion Cycle with a New Internal Combustion Engine with Rhombic Link Z-Crank Mechanism Transactions of Society of Automotive Engineers of Japan 33 2 19 24 2002
- Sano, S. Kamiyama, E. Ueda, T. Improvement of Thermal Efficiency by Offsetting the Crankshaft Center to the Cylinder Bore Center 1996 JSAE Annual Congress Proceedings, 9638770 129 132 1996