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An Experimental Study on the Effect of More Expansion Cycle in a Spark- Ignition Engine Utilizing either Early- or Late-Closing of Intake Valve
Technical Paper
2000-05-0037
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English
Abstract
This paper presents a further investigation into the effect of more-expansion cycle in a spark-ignition engine. On the basis of the results obtained in the previous studies, several combinations of late-closing (L.C.) of intake valve and expansion ratios were tested using a single-cylinder production engine. A large volume of intake capacity was put into the intake manifold to simulate multi-cylinder engines. With a large intake capacity, L.C. can decrease the pumping loss and thus increase the mechanical efficiency. Increasing the expansion ratio from 11 to 23.9 with L.C. application can produce about 11% improvement of thermal efficiency which was suggested to be caused by the increased cycle efficiency. The decrease of compression ratio from 11 to 5.5 gives little effect on the thermal efficiency if the expansion ratio could be kept constant. Thus, the expansion ratio is revealed to be a determining factor for cycle efficiency, while compression ratio is no more important, which suggests the usefulness of controlling the intake charge with intake valve closure timing. These were successfully explained by simple thermodynamic calculation and thus the mechanism could be verified by the estimation.
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Authors
- Seiichi SHIGA - 1)2)4)5)6) Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan 3) Honda Motor Co. Ltd., Advisor Emreitus
- Yasuyuki HIROOKA - 1)2)4)5)6) Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan 3) Honda Motor Co. Ltd., Advisor Emreitus
- Shizuo YAGI - 1)2)4)5)6) Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan 3) Honda Motor Co. Ltd., Advisor Emreitus
- Herchel T.C. MACHACON - 1)2)4)5)6) Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan 3) Honda Motor Co. Ltd., Advisor Emreitus
- Takao KARASAWA - 1)2)4)5)6) Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan 3) Honda Motor Co. Ltd., Advisor Emreitus
- Hisao NAKAMURA - 1)2)4)5)6) Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan 3) Honda Motor Co. Ltd., Advisor Emreitus
Citation
SHIGA, S., HIROOKA, Y., YAGI, S., MACHACON, H. et al., "An Experimental Study on the Effect of More Expansion Cycle in a Spark- Ignition Engine Utilizing either Early- or Late-Closing of Intake Valve," SAE Technical Paper 2000-05-0037, 2000.Also In
References
- Taylor, C.F. The Internal Combustion Engines in Theory and Practice II 1979 403 The MIT Press
- Tomizuka, K. History of Internal Combustion Engines 42 1978 San-ei Shobo Co. (in Japanese)
- Heywood, J.B. The Internal Combustion Engine Fundamentals 1998 183 McGraw Hill Book Co.
- Cho, F. et al Proc. of JSAE Conf. No.951 Yokohama 1995 277
- Ueda, K. et al Proc. of JSAE Symposium No.9802 Toyohashi 1998-3 32
- Shiga, S. et al SAE Paper, No. 960585 1996
- Shiga, S. et al Proc. of JSAE Spring Convention, No.984 1998 43