This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Benefits of Late Inlet Valve Timing Strategies Afforded Through the Use of Intake Cam In Cam Applied to a Gasoline Turbocharged Downsized Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2011 by SAE International in United States
Annotation ability available
Gasoline engine downsizing is already established as a proven technology to reduce automotive fleet CO₂ emissions. Further real-world benefits are possible through more aggressive downsizing; however, there is a trade-off between maintaining a high compression ratio for good part load fuel consumption and maintaining optimal combustion phasing at higher loads. There are many different technologies, which could be applied to gasoline-downsized engines in order to improve efficiency. One is to adopt a Miller/Atkinson cycle, which uses variable valve timing to reduce throttling losses in part load operation and reduce effective compression ratio to optimize combustion phasing at higher loads.
MAHLE Intake CamInCam® is a technology enabler for Miller/Atkinson cycle operation. It uses asymmetric intake valve timing control to effectively provide a method of running increased intake cam duration allowing Late Intake Valve Closing cycle strategies to be adopted.
This paper investigates the effects of this technology applied to a 1.4-liter gasoline direct injection engine. It demonstrates high load combustion phasing improvements through reduced effective compression ratio and improvements at part load through pumping work reduction. The paper also covers the investigation of asymmetric cam control on charge motion through the use of moving geometry CFD.
CitationTaylor, J., Fraser, N., Dingelstadt, R., and Hoffmann, H., "Benefits of Late Inlet Valve Timing Strategies Afforded Through the Use of Intake Cam In Cam Applied to a Gasoline Turbocharged Downsized Engine," SAE Technical Paper 2011-01-0360, 2011, https://doi.org/10.4271/2011-01-0360.
- Louis, J.J.J. “Well-To-Wheel Energy Use and Greenhouse Gas Emissions for Various Vehicle Technologies,” SAE Technical Paper 2001-01-1343 2001 10.4271/2001-01-1343
- Bandivadekar, Anup et. al “On the Road in 2035 - Reducing Transportation's Petroleum Consumption and GHG Emissions” Report Laboratory for Energy and the Environment Massachusetts Institute of Technology July 2008
- Andriesse, Dirk Dr. et. al “The New 1.8 1 DI Turbo-Jet Gasoline Engine from Fiat Powertrain Technologies” 17 Aachener Kolloquium Fahrzeug- und Motorentechnik Aachen 2008
- Heywood, J. B. “Internal Combustion Engine Fundamentals,” McGraw-Hill Book Co. 978-0070286375 161 186 1988
- Miller, R.H. “Supercharging and the Internal Cooling Cycle for High Output” Trans. ASME 69 1947
- Wang, Y. et. al “An analytic study of applying Miller cycle to reduce NO x emission” Applied Thermal Engineering 27 2007 1779 1789 2007
- Wang, Y. et. al “Application of the Miller cycle to reduce NO x emissions from petrol engines” Applied Energy 85 2008 463 474
- Akihisa, D. Sawada, D. “Research on Improving Thermal Efficiency through Variable Super-High Expansion Ratio Cycle,” SAE Technical Paper 2010-01-0174 2010 10.4271/2010-01-0174
- Martins, J.J.G. Uzuneanu, K. Ribeiro, B.S. Jasasky, O. “Thermodynamic Analysis of an Over-Expanded Engine,” SAE Technical Paper 2004-01-0617 2004 10.4271/2004-01-0617
- Bassett, M.D. ‘Investigation of technologies to improve drive-cycle fuel economy.’ I.Mech.E. Conference ‘The Real Hybrid Vehicles’ Dunton, England Sept. 20 2005
- Hitomi, M. Sasaki, J. Hatamura, K. Yano, Y. “Mechanism of Improving Fuel Efficiency by Miller Cycle and Its Future Prospect,” SAE Technical Paper 950974 1995 10.4271/950974
- Goto, T. Hatamura, K. Takizawa, S. Hayama, N. et al. “Development of V6 Miller Cycle Gasoline Engine,” SAE Technical Paper 940198 1994 10.4271/940198
- Schneider, F. Lettmann, M. “MAHLE CamInCam, die neue Lösung für variable Ventilsteuerzeiten” 16 Aachener Kolloquium Fahrzeug- und Motorentechnik Aachen 2007
- Sugiyama, T. Hiyoshi, R. Takemura, S. Aoyama, S. “Technology for Improving Engine Performance using Variable Mechanisms,” SAE Technical Paper 2007-01-1290 2007 10.4271/2007-01-1290
- Bunsen, E. Grote, A. Willand, J. Hoffmann, H. Fritz, O. Senjic, S. “Fuel consumption improvements by variation of intake valve lift and timing - A mechanically fully variable valvetrain system for a 1.6l gasoline engine with direct injection” Haus der Technik Variable Valvetrain Congress 2007
- Kapus, P.E. Denger, D. Holland, T. “Intelligent Simplification - Ways Towards Improved Fuel Economy,” SAE Technical Paper 2002-01-0236 2002 10.4271/2002-01-0236
- Stansfield, P.A. Wigley, G. Garner, C.P. Patel, R. et al. “Unthrottled Engine Operation using Variable Valve Actuation: The Impact on the Flow Field, Mixing and Combustion,” SAE Technical Paper 2007-01-1414 2007 10.4271/2007-01-1414
- Blakey, S.C. Saunders, R.J. Ma, T.H. Chopra, A. “A Design and Experimental Study of an Otto Atkinson Cycle Engine Using Late Intake Valve Closing,” SAE Technical Paper 910451 1991 10.4271/910451
- Boggs, D.L. Hilbert, H.S. Schechter, M.M. “The Otto-Atkinson Cycle Engine-Fuel Economy and Emissions Results and Hardware Design,” SAE Technical Paper 950089 1995 10.4271/950089
- Zaccardi, J.-M. Pagot, A. Vangraefschepe, F. Dognin, C. et al. “Optimal Design for a Highly Downsized Gasoline Engine,” SAE Technical Paper 2009-01-1794 2009 10.4271/2009-01-1794
- Parvate-Patil, G.B. Hong, H. Gordon, B. “An Assessment of Intake and Exhaust Philosophies for Variable Valve Timing,” SAE Technical Paper 2003-32-0078 2003 10.4271/2003-32-0078
- Leone, T.G. Christenson, E.J. Stein, R.A. “Comparison of Variable Camshaft Timing Strategies at Part Load,” SAE Technical Paper 960584 1996 10.4271/960584
- Ariga, S. et. al “Optimum intake valve actuation for fuel economy and improved performance with simple control” Engine Technology Progress in Japan 2010
- Lake, T. Stokes, J. Murphy, R. Osborne, R. et. al. “Turbocharging Concepts for Downsized DI Gasoline Engines,” SAE Technical Paper 2004-01-0036 2004 10.4271/2004-01-0036
- Watanabe, S. Koga, H. Kono, S. “Research on Extended Expansion General-Purpose Engine - Theoretical Analysis of Multiple Linkage System and Improvement of Thermal Efficiency,” SAE Technical Paper 2006-32-0101 2006 10.4271/2006-32-0101