This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Exploring the Advantages of Variable Compression Ratio in Internal Combustion Engines by Using Engine Performance Simulations
Technical Paper
2011-01-0364
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Variable compression ratio is the technology to adjust internal combustion engine cylinder compression ratio to increase fuel efficiency while under varying loads. The paper presents a new design of a variable compression ratio engine that allows for the volume above the piston at Top Dead Centre (TDC) to be changed. A modeling study is then performed using the WAVE engine performance simulation code for a naturally aspirated gasoline V8 engine. The modeling study shows significant improvements of fuel economy over the full range of loads and especially during light loads operation as well as an improvement of top power and torque outputs. Adjusting the Compression Ratio CR from the low speed wide open throttle knock limited value of CR=10:1 to a variable CR=10:1 to 15:1 for better or about same margin to knock over the full range of engine speeds and loads, maximum torque, power and brake engine thermal efficiency are increased by 5%, 12.5% and 4.5% respectively, while operating at 1 bar Brake Mean Effective Pressure (BMEP) and 2 bar BMEP the brake thermal engine efficiency is up to 10% better.
Recommended Content
Authors
Topic
Citation
Boretti, A. and Scalzo, J., "Exploring the Advantages of Variable Compression Ratio in Internal Combustion Engines by Using Engine Performance Simulations," SAE Technical Paper 2011-01-0364, 2011, https://doi.org/10.4271/2011-01-0364.Also In
References
- Wallace, W.A. Lux, F.B. “A Variable Compression Ratio Engine Development,” SAE Technical Paper 640060 1964 10.4271/640060
- Basiletti, J.C. Blackburne, E.F. “Recent Developments in Variable Compression Ratio Engines,” SAE Technical Paper 660344 1966 10.4271/660344
- Sobotowski, R.A. Porter, B.C. Pilley, A.D. “The Development of a Novel Variable Compression Ratio, Direct Injection Diesel Engine,” SAE Technical Paper 910484 1991 10.4271/910484
- Pischinger, S. Yapici, K.I. Schwaderlapp, M. Habermann, K. “Variable Compression in SI Engines,” SAE Technical Paper 2001-24-0050 2001 10.4271/2001-24-0050
- Mendler, C. Gravel, R. “Variable Compression Ratio Engine,” SAE Technical Paper 2002-01-1940 2002 10.4271/2002-01-1940
- Schwaderlapp, M. Habermann, K. Yapici, K.I. “Variable Compression Ratio - A Design Solution for Fuel Economy Concepts,” SAE Technical Paper 2002-01-1103 2002 10.4271/2002-01-1103
- Moteki, K. Aoyama, S. Ushijima, K. Hiyoshi, R. et al. “A Study of a Variable Compression Ratio System with a Multi-Link Mechanism,” SAE Technical Paper 2003-01-0921 2003 10.4271/2003-01-0921
- Roberts, M. “Benefits and Challenges of Variable Compression Ratio (VCR),” SAE Technical Paper 2003-01-0398 2003 10.4271/2003-01-0398
- Rabhi, V. Beroff, J. Dionnet, F. “Study of a Gear-Based Variable Compression Ratio Engine,” SAE Technical Paper 2004-01-2931 2004 10.4271/2004-01-2931
- Rabhi, D. Rabhi, V. Ranson, P. “Gear Design and Dimensioning Study for a Variable Compression Ratio Engine,” SAE Technical Paper 2005-01-3131 2005 10.4271/2005-01-3131
- Rosso, P.A. Beard, J. Blough, J.R. “A Variable Displacement Engine with Independently Controllable Stroke Length and Compression Ratio,” SAE Technical Paper 2006-01-0741 2006 10.4271/2006-01-0741
- Tanaka, Y. Hiyoshi, R. Takemura, S. Ikeda, Y. et al. “A Study of a Compression Ratio Control Mechanism for a Multiple-Link Variable Compression Ratio Engine,” SAE Technical Paper 2007-01-3547 2007 10.4271/2007-01-3547
- Ishikawa, S. Kadota, M. Yoshida, K. Takahashi, K. et al. “Advanced Design of Variable Compression Ratio Engine with Dual Piston Mechanism,” SAE Int. J. Engines 2 1 982 990 2009 10.4271/2009-01-1046
- Kadota, M. Ishikawa, S. Yamamoto, K. Kato, M. et al. “Advanced Control System of Variable Compression Ratio (VCR) Engine with Dual Piston Mechanism,” SAE Int. J. Engines 2 1 1009 1018 2009 10.4271/2009-01-1063
- Heywood, John B. “Improving the Spark-Ignition Engine” 2005 ERC Symposium Madison, WI (US) June 2005 http://www.erc.wisc.edu/documents/symp05-Heywood.pdf August 2 2010
- Heywood, John B. “Internal Combustion Engines Fundamentals” McGraw-Hill New York 1988
- http://www.freepatentsonline.com/20060048728.pdf
- http://www.freepatentsonline.com/20100180868.pdf
- http://www.ricardo.com/en-gb/Software/Products/WAVE/ August 2 2010
- Chen, S.K. Flynn, P.F. “Development of Single Cylinder Compression Ignition Research Engine,” SAE Technical Paper 650733 1965 10.4271/650733
- Douaud, A.M. Eyzat, P. “Four-Octane-Number Method for Predicting the Anti-Knock Behavior of Fuels and Engines,” SAE Technical Paper 780080 1978 10.4271/780080