This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effects of Squish Area Shape on Knocking in a Four-Valve Spark Ignition Engine
Technical Paper
1999-01-1494
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Squish flow control is well known as a key technology for improving knock limit in spark ignition engines. However, to acquire a sufficient squish area in a four-valve engine is difficult. In order to achieve a maximum effect of knock suppression with a minimum squish area, we have developed, what we call, a Slant Squish Combustion Chamber for new engines. A slant squish compared with a conventional squish produces an effective reverse squish flow in the early expansion stroke, resulting in higher flow velocity and turbulence. Furthermore, flame propagation to squish area and end gas is accelerated. These improvements are considered to suppress the knock phenomenon. Consequently, with a slant squish, a high compression ratio, to achieve low fuel consumption and high engine performance is realized.
Recommended Content
| Technical Paper | An Experimental Investigation on a New Squish Jet-Turbulence Combustion Chamber for SI Engine |
| Technical Paper | Development of Four-stroke Outboard Motor |
| Technical Paper | Comparison of Direct Injection Gasoline Combustion Systems |
Authors
Citation
Ueda, T., Okumura, T., Sugiura, S., and Kojima, S., "Effects of Squish Area Shape on Knocking in a Four-Valve Spark Ignition Engine," SAE Technical Paper 1999-01-1494, 1999, https://doi.org/10.4271/1999-01-1494.Also In
References
- Matsumoto K. Inoue T. Nakanishi K. Okumura T. “The Effects of Combustion Chamber Design and Compression Ratio on Emissions, Fuel Economy and Octane Number Requirement” SAE Paper 770193 1977
- Belaire R.C. Davis G.C. Kent J.C. Tabaczynski R.J. “Combustion Chamber Effects on Burn Rate in a High Swirl Spark Ignition Engine” SAE Paper 830335 1983
- Nakajima Y. “Trends in Increasing Compression Ratio and Future Tasks” Journal of Society of Automotive Engineers of Japan 39 9 1985
- Hashimoto N. Shiraishi T. Tanaka H. “Development of a Low HC,High Efficiency Combustion Chamber for a High Power 4V Engine” FISITA 24th 2 1992
- Adachi S. Horio K. Nakamura Y. Nakano K. Tanke A. “Development of Toyota 1ZZ-FE Engine” SAE Paper 981087 1998
- Tada H. Takaoka T. Nouno Y. Sasaki N. Ueda T. “Development of New In-line 4-cylinder 1.5L Gasoline Engine for the TOYOTA Hybrid System”
- Kawamura H. Asahi T. Goto M. Endou K. Kawai K. “Development of Toyota New V12 Gasoline Engine” Journal of Society of Automotive Engineers of Japan 51 9 1997
- Kojima S. Miyagawa H. Katsumi N. Okumura T. Ueda T. “Mechanism of Knock Suppression by Newly Developed Squish Shape” Proceedings of 75th JSME Spring Annual Meeting 513-514 1998
- Miyagawa H. Kojima S. Katsumi N. Ueda T. Okumura T. “Numerical Analysis of the Effects of Squish Geometry on a Newly Developed 4-Valve Gasoline Engine Combustion Process” The Fourth International Symposium COMODIA 98 1998
- Nakajima Y. Nagai T. Iijima T. Yokoyama J. Nakamura K. “Analysis of Combustion Patterns Effective in Improving Anti-Knock Performance of a Spark Ignition Engine” JSAE Review March 1984
- Hayashi T. Taki M. Kojima S. Kondo T. “Photographic Observation of Knock with a Rapid Compression and Expansion Machine” SAE Paper 841336 1984