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A Study on Optimization of an Over-Expansion Cycle Gasoline Engine with Late-Closing of Intake Valves
Technical Paper
2007-24-0089
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This study presents the possibility of realizing better thermal efficiency in a spark-ignition engine with over-expansion cycle. The test engine with the displacement volume of 649cc was used together with four kinds of expansion ratios (geometric compression ratio) from 10 to 25, and four sets of intake valve closure timings from 0 to 110 ° C.A. ABDC. In previous studies, the indicated thermal efficiency reached 48% However, there was a problem that the maximum output was reduced to almost half compared with the conventional engine, since the effective displacement volume was decreased with decreasing the substantial compression ratio (εc). As a method of solving this problem, supercharging was applied by using compressed air supplied from an external compressor. As a result, BMEP could be vastly expanded under most conditions, and the BSFC could be improved by 22% at the maximum comparing with the original condition with the compression ratio of 10 and the intake valve closure timing of 0deg. C.A. ABDC.
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Authors
- Yuichi SAKATA - Department of Mechanical Engineering, Gunma University1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan
- Kosuke YAMANA - Department of Mechanical Engineering, Gunma University1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan
- Kenji NISHIDA - Honda R&D, Asaka, Saitama 351-0024, Japan
- Takayuki SHIMIZU - Gunma University
- Seiichi SHIGA - Gunma University
- Mikiya ARAKI - Gunma University
- Hisao NAKAMURA - Gunma University
- Tomio OBOKATA - Gunma University
Topic
Citation
SAKATA, Y., YAMANA, K., NISHIDA, K., SHIMIZU, T. et al., "A Study on Optimization of an Over-Expansion Cycle Gasoline Engine with Late-Closing of Intake Valves," SAE Technical Paper 2007-24-0089, 2007, https://doi.org/10.4271/2007-24-0089.Also In
References
- Yuzawa Y. et al Characteristics of Over-Expansion Cycle in a Large SI Engine with Late-Closing of Intake Valve CD Proceedings of the 18 th Internal Engine Symposium, Seoul 2002
- Shiga S. Effect of the Application of Over-Expansion Cycle on the Improvement of Thermal efficiency in a Gasoline Engine Symposium Text of JSAE, No.17-04 2004 13 19
- Tuttle J.H. Controlling Engine Load by Means of Late Intake-Valve Closing SAE Paper 800794 1980
- Tuttle J.H. Controlling Engine Load by Means of Early Intake-Valve Closing SAE Paper 820408 1982
- Anderson M.K. Assanis D.N. Filipi Z.S. First and Second Law Analyses of a Naturally-Aspirated, Miller Cycle, SI Engine with Late Intake Valve Closure SAE Paper 980889 1998
- Zhang F. et al Study on Miller Cycle Gas Engine for Generation, -A Verification of Miller Cycle Effect-, Proc. of JSAE Spring Convention Yokohama 1995 277
- Ueda T. et al A High Expansion Ratio Gasoline Engine for the Hybrid Vehicle Proc. of JSAE Symposium, No. 9802, Toyohashi 1998 32
- Heywood J.B. Internal Combustion Engine Fundamentals McGraw-Hill Book Company 1988 715
- Ishizawa S. Characteristics of Quenching Crevice Widths in Combustion Chamber of a Spark Ignition Engine Transactions of the Japan Society of Mechanical Engineers, Series B 62 593 1996 402 403