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Effects of Charging System Variability on the Performance and Fuel Economy of a Supercharged Spark-Ignition Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
Annotation ability available
The paper discusses the effects of various charging system technologies on the performance and fuel consumption of a modern supercharged engine, the Jaguar Land Rover AJ126 3.0 litre V6. The goal of the project was to improve performance and reduce the fuel consumption of the standard engine by researching new technologies around the supercharger. As standard the AJ126 engine uses an Eaton R1320 supercharger with a fixed ratio drive from the crankshaft and no clutch. The project sought to investigate the effect of three novel technologies providing various levels of improvement to the basic specification: a new V1270C V-series supercharger from Eaton with improved low-speed volumetric efficiency (in order to quantify potential improvements in low-speed torque), a clutch to disengage the supercharger completely (to investigate the effect of parasitic losses through churning in the supercharger), and finally a variable-ratio supercharger drive system allowing increased control of air flow to the engine (the Fallbrook NuVinci system, providing the ability to better match supercharger delivery to the instantaneous air mass flow demand of the engine).
The different technologies were first tested individually on a dynamometer in order to compare them to the standard AJ126 configuration. This work package quantified the effect of each technology on full-load performance and also on fuel consumption at discrete speed and torque points used as indicators for regulated fuel economy tests. Time-to-torque was also measured during this phase. The components were then built onto a single test engine and installed in a test vehicle, where in-vehicle performance was evaluated. A switching system permitted the effect of the individual technologies to be evaluated by the driver.
Results are presented for each configuration, and discussion is made regarding where the improvements in fuel economy seen with the different technologies originate from. Finally, some discussion is made regarding the value of variable-speed supercharger drives in compound-charging systems, an area of extreme downsizing that has previously been shown to benefit from greater variability.
- A. Meghani - Cosworth, Ltd.
- J. Allen - Cosworth, Ltd.
- J.W.G. Turner - Jaguar Land Rover
- A. Popplewell - Jaguar Land Rover
- D.J. Marshall - Jaguar Land Rover
- J.S. Hoyle - Jaguar Land Rover
- S. McBroom - Fallbrook Technologies Inc
- R. Urista - Fallbrook Technologies Inc
- M. Bazyn - Fallbrook Technologies Inc
CitationMeghani, A., Allen, J., Turner, J., Popplewell, A. et al., "Effects of Charging System Variability on the Performance and Fuel Economy of a Supercharged Spark-Ignition Engine," SAE Technical Paper 2015-01-1286, 2015, https://doi.org/10.4271/2015-01-1286.
- Turner , J. , Popplewell , A. , Patel , R. , Johnson , T. et al. Ultra Boost for Economy: Extending the Limits of Extreme Engine Downsizing, SAE Int. J. Engines 7 1 387 417 2014 10.4271/2014-01-1185
- McAllister , M.J. and Buckley D.J. Future gasoline engine downsizing technologies - CO2 improvements and engine design considerations 19 26 Institution of Mechanical Engineers Internal Combustion Engines Conference London, UK 8th 9th December 2009
- Sammons , H. and Chatterton , E. The Napier Nomad Aircraft Diesel Engine SAE Transactions 63 107 107 131 1955
- Doble , I. Supercharging with an Axial Compressor, SAE Technical Paper 870722 1987 10.4271/870722
- Gunston , B. , World Encyclopaedia of Aero Engines Patrick Stephens Limited Sparkford, Yeoville, Somerset, BA22 7JJ, UK 1995 3rd 1-85260-509-X
- Krebs , R. , Szengel , R. , Middendorf , H. , Fleiß , M. , Laumann , A. and Voeltz , S. The New Dual-Charged FSI Petrol Engine by Volkswagen Part 1: Design MTZ 11 2005 66 2 7 November 2005
- Krebs , R. , Szengel , R. , Middendorf , H. , Sperling , H. , Siebert , W. , Theobald , J. and Michels , K. The New Dual-Charged FSI Petrol Engine by Volkswagen Part 2: Thermodynamics MTZ 12 2005 66 23 26 December 2005
- Sandford , M. , Page , G. , and Crawford , P. The All New AJV8, SAE Technical Paper 2009-01-1060 2009 10.4271/2009-01-1060
- McBroom , S. , Pohl , B. , Smithson , R. , Feicht , D. and Solis , J. Demonstration of a Practical Continuously Variable Accessory Drive System for Engine Driven Accessories SAE paper number 2009-01-1097 , SAE 2009 World Congress Detroit, Michigan, USA 20th 23rd April 2009 10.4271/2009-01-1097
- McBroom , S. , Smithson , R. , Urista , R. and Chadwell , C. Effects of Variable Speed Supercharging Using a Continuously Variable Planetary on Fuel Economy and Low Speed Torque SAE paper number 2012-01-1737 , SAE 2012 Fall Powertrain Conference, Sweden, Malmo, Sweden September 18 20 2012 10.4271/2012-01-1737
- Turner , J.W.G. , Popplewell , A. , Marshall , D. , Johnson T. , Barker , L. , Martin , J. , King , J. , Lewis , A.J.G. , Akehurst , S. , Brace , C.J. and Copeland , C.D. SuperGen on Ultraboost: Variable-Speed Centrifugal Supercharging as an Enabling Technology for Extreme Engine Downsizing SAE paper number 2015-01-1282 , SAE 2015 World Congress, Detroit, Michigan, USA 21st 23rd April 2015