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Optimal Use of Boosting Configurations and Valve Strategies for High Load HCCI - A Modeling Study
Technical Paper
2012-01-1101
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This study investigates a novel approach towards boosted HCCI operation, which makes use of all engine system components in order to maximize overall efficiency. Four-cylinder boosted HCCI engines have been modeled employing valve strategies and turbomachines that enable high load operation with significant efficiency benefits. A commercially available engine simulation software, coupled to the University of Michigan HCCI combustion and heat transfer correlations, was used to model the HCCI engines with three different boosting configurations: turbocharging, variable geometry turbocharging and combined supercharging with turbocharging. The valve strategy features switching from low-lift Negative Valve Overlap (NVO) to high-lift Positive Valve Overlap (PVO) at medium loads. The new operating approach indicates that heating of the charge from external compression is more efficient than heating by residual gas retention strategies. Hot intake charge allows for valve events and combustion phasing that enable high turbine performance and alleviate the backpressure problems often associated with boosted HCCI. Reduced pumping work and high intake pressure allow for further improvements in the upper load limit and efficiency, while avoiding NOx formation and ringing.
Boosting enables high load HCCI but combustion needs to occur in such a way as to allow for increased exhaust energy directed to the turbine. The addition of supercharging allows for higher intake pressures and temperatures, while the associated mechanical work penalty can be minimized by optimizing the supercharger gearing. The successful use of PVO and currently available turbochargers supports the realization of a dual mode SI/HCCI engine. This is also supported by the presence of high intake temperatures which allow compression ratio values closer to those of mainstream direct injection SI engines.
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Mamalis, S., Babajimopoulos, A., Guralp, O., and Najt, P., "Optimal Use of Boosting Configurations and Valve Strategies for High Load HCCI - A Modeling Study," SAE Technical Paper 2012-01-1101, 2012, https://doi.org/10.4271/2012-01-1101.Also In
References
- Onishi, S. Jo, S. Shoda, K. Jo, P. et al. “Active Thermo-Atmosphere Combustion (ATAC) - A New Combustion Process for Internal Combustion Engines,” SAE Technical Paper 790501 1979 10.4271/790501
- Noguchi, M. Tanaka, Y. Tanaka, T. Takeuchi, Y. “A Study on Gasoline Engine Combustion by Observation of Intermediate Reactive Products during Combustion,” SAE Technical Paper 790840 1979 10.4271/790840
- Najt, P. Foster, D. “Compression-Ignited Homogeneous Charge Combustion,” SAE Technical Paper 830264 1983 10.4271/830264
- Thring, R. “Homogeneous-Charge Compression-Ignition (HCCI) Engines,” SAE Technical Paper 892068 1989 10.4271/892068
- Milovanovic, N. Chen, R. Turner, J. “Influence of the Variable Valve Timing Strategy on the Control of a Homogeneous Charge Compression (HCCI) Engine,” SAE Technical Paper 2004-01-1899 2004 10.4271/2004-01-1899
- Caton, P.A. Song, H.H. Kaahaaina, N.B. Edwards, C.F. “Residual-effected homogeneous charge compression ignition with delayed intake-valve closing at elevated compression ratio,” Int. J. Engine Res. 2005 6 4 399 219
- Kuo, T.-W. “Valve and Fueling Strategy for Operating a Controlled Auto-Ignition Combustion Engine,” SAE 2006 HCCI Symposium September 2006
- Babajimopoulos, A. Challa, V.S.S.P. Lavoie, G.A. Assanis, D.N. “Model-Based Assessment of Two Variable Cam Timing Strategies for HCCI Engines: Recompression vs. Rebreathing,” Proceedings of the ASME Internal Combustion Engine Division 2009 Spring Technical Conference, ICES2009-76103
- Yun, H. Wermuth, N. Najt, P. “High Load HCCI Operation Using Different Varying Strategies in a Naturally-Aspirated Gasoline HCCI Engine,” SAE Int. J. Engines 4 1 1190 1201 2011 10.4271/2011-01-0899
- Christensen, M. Johansson, B. Amnéus, P. Mauss, F. “Supercharged Homogeneous Charge Compression Ignition,” SAE Technical Paper 980787 1998 10.4271/980787
- Olsson, J. Tunestål, P. Haraldsson, G. Johansson, B. “A Turbo Charged Dual Fuel HCCI Engine,” SAE Technical Paper 2001-01-1896 2001 10.4271/2001-01-1896
- Olsson, J. Tunestål, P. Johansson, B. “Boosting for High Load HCCI,” SAE Technical Paper 2004-01-0940 2004 10.4271/2004-01-0940
- Hyvönen, J. Haraldsson, G. Johansson, B. “Supercharging HCCI to Extend the Operating Range in a Multi-Cylinder VCR-HCCI Engine,” SAE Technical Paper 2003-01-3214 2003 10.4271/2003-01-3214
- Yap, D. Wyszynski, M. Megaritis, A. Xu, H. “Applying boosting to gasoline HCCI operation with residual gas trapping,” SAE Technical Paper 2005-01-2121 2005 10.4271/2005-01-2121
- Cairns, A. Blaxill, H. “Lean Boost and External Exhaust Gas Recirculation for High Load Controlled Auto-Ignition,” SAE Technical Paper 2005-01-3744 2005 10.4271/2005-01-3744
- Wilhelmsson, C. Tuneståal, P. Johansson, B. “Operation strategy of a Dual Fuel HCCI Engine with VGT,” SAE Technical Paper 2007-01-1855 2007 10.4271/2007-01-1855
- Martins, M. Zhao, H. “4-Stroke Multi-Cylinder Gasoline Engine with Controlled Auto-Ignition (CAI) Combustion: a comparison between Naturally Aspirated and Turbocharged Operation,” SAE Technical Paper 2008-36-0305 2008 10.4271/2008-36-0305
- Johansson, T. Johansson, B. Tunestål, P. Aulin, H. “HCCI Operating Range in a Turbo-charged Multi Cylinder Engine with VVT and Spray-Guided DI,” SAE Technical Paper 2009-01-0494 2009 10.4271/2009-01-0494
- Dec, J. Yang, Y. “Boosted HCCI for High Power without Engine Knock and with Ultra-Low NOx Emissions - using Conventional Gasoline,” SAE Int. J. Engines 3 1 750 767 2010 10.4271/2010-01-1086
- Dec, J. Yang, Y. Dronniou, N. “Boosted HCCI - Controlling Pressure-Rise Rates for Performance Improvements using Partial Fuel Stratification with Conventional Gasoline,” SAE Int. J. Engines 4 1 1169 1189 2011 10.4271/2011-01-0897
- Mamalis, S. Nair, V. Andruskiewicz, P. Assanis, D. et al. “Comparison of Different Boosting Strategies for Homogeneous Charge Compression Ignition Engines - A Modeling Study,” SAE Int. J. Engines 3 1 296 308 2010 10.4271/2010-01-0571
- Kulzer, A. Nier, T. Karrelmeyer, R. “A Thermodynamic Study on Boosted HCCI: Experimental Results,” SAE Technical Paper 2011-01-0905 2011 10.4271/2011-01-0905
- Gamma Technologies. Inc. http://www.gtisoft.com
- Eng, J. “Characterization of Pressure Waves in HCCI Combustion,” SAE Technical Paper 2002-01-2859 2002 10.4271/2002-01-2859
- Heywood, J.B. 1988 Internal Combustion Engine Fundamentals McGraw-Hill New York 1988
- Farrell, J. Stevens, J. Weissman, W. “A Second Law Analysis of High Efficiency Low Emission Gasoline Engine Concepts,” SAE Technical Paper 2006-01-0491 2006 10.4271/2006-01-0491