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Analysis of a SuperTurbocharged Downsized Engine Using 1-D CFD Simulation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2010 by SAE International in United States
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The VanDyne SuperTurbocharger (SuperTurbo) is a turbocharger with an integral Continuously Variable Transmission (CVT). By changing the gear ratio of the CVT, the SuperTurbo is able to either pull power from the crankshaft to provide a supercharging function, or to function as a turbo-compounder, where energy is taken from the turbine and given to the crankshaft. The SuperTurbo's supercharger function enhances the transient response of a downsized and turbocharged engine, and the turbo-compounding function offers the opportunity to extract the available exhaust energy from the turbine rather than opening a waste gate.
Using 1-D simulation, it was shown that a 2.0-liter L4 could exceed the torque curve of a 3.2L V6 using a SuperTurbo, and meet the torque curve of a 4.2-liter V8 with a SuperTurbo and a fresh-air bypass configuration. In each case, the part-load efficiency while using the SuperTurbo was better than the baseline engine. For the bypass configuration, the full-load efficiency was better as well. Also shown was the transient response of the system was similar to a naturally aspirated (N/A) engine, even at low engine speeds. Downsizing from a 3.2L improved fuel economy 17%, and downsizing from a 4.2L improved 36% on the NEDC driving cycle
When implemented with a close coupled catalyst and an air bypass configuration, where some fraction of the boost air bypasses the engine and is inserted into the exhaust in front of the turbine, the exhaust temperatures were air cooled so that fuel enrichment was not necessary. The result was a gasoline engine that could run at high brake mean effective pressure (BMEP) at low engine speeds, and because of the special bypass configuration, can go to high loads with a single compressor. A bypass arrangement would not be possible without the supercharger function of the SuperTurbo.
CitationChadwell, C. and Walls, M., "Analysis of a SuperTurbocharged Downsized Engine Using 1-D CFD Simulation," SAE Technical Paper 2010-01-1231, 2010, https://doi.org/10.4271/2010-01-1231.
- Lumsden, G. OudeNijeweme, D. Fraser, N. Blaxill, H. “Development of a Turbocharged Direct Injection Downsizing Demonstrator Engine,” SAE Int. J. Engines 2 1 1420 1432 2009
- Shaded, S.M. Baur, K.-H. “Parametric Studies of the Impact of Turbocharging on Gasoline Engine Downsizing,” SAE Int. J. Engines 2 1 1347 1358 2009
- Kleeberg, H. Tomazic, D. Lang, O. Habermann, K. “Future Potential and Development Methods for High Output Turbocharged Direct Injected Gasoline Engines,” SAE Technical Paper 2006-01-0046 2006
- Petitjean, D. Bernardini, L. Middlemass, C. Shahed, S.M. “Advanced Gasoline Engine Turbocharging Technology for Fuel Economy Improvements,” SAE Technical Paper 2004-01-0988 2004
- Dipl.-Ing.A.Königstein Internationales Wiener Motorensymposium 2008
- Super-Turbocharger U.S. Patent Application 11/204,817
- VanDyne E. “An Advanced Turbcharging System for Improved Fuel Efficiency” ICE2007-1808 2007
- Samaras Z. Geivanidis S. “Comparison of the Fuel Consumption Measured Over EU and US Legislated Cycles” http://www.walshcarlines.com/pdf/US-EPA_NEDC_comparison.pdf
- Fisher F.B. “Application of Map Width Enhancement Devices to Turbocharger Compressor Stages” SAE Paper 880794