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Drivecycle Benefits of Controlling Airflow with the SuperTurbo™
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The SuperTurbo™ is a driven turbocharger that uses a high-speed traction drive combined with a CVT (Continuously Variable Transmission) or electric motor to provide additional power to or from the turbo shaft. The CVT can be shifted to a ratio that provides a turbo speed that generates a desired boost pressure and air flow rate to the engine. Unlike a conventional turbocharger, where the turbine and compressor powers must be balanced, the a driven turbocharger can provide additional power to the turbo shaft through supercharging when the turbine is not collecting sufficient power to drive the compressor to the desired boost pressure, and during other operating conditions can absorb excess turbine power through turbo-compounding to improve engine efficiency. This direct control of air flow to the engine enables greater flexibility in engine operation. The topics presented focus on heavy-duty diesel engines, but the concepts can be applied to all engine types. Transient response is improved, as well as fuel efficiency during transient operation of diesel engines, as excess fueling to provide exhaust energy to the turbine is avoided. Instead, additional airflow is provided to the engine through supercharging to increase combustion efficiency. This aids in engine downspeeding, as well as downsizing, to provide improved drivability of the vehicle. Simulations and engine testing show that efficient transients can provide a fuel savings of up to 6% over a transient drivecycle, and the ability to downspeed the engine can provide an additional 3% efficiency gain. Overall, the ability to directly control airflow to the engine provides flexibility for engine operation that is not possible with a conventional turbocharger.
CitationBrown, J. and Waldron, T., "Drivecycle Benefits of Controlling Airflow with the SuperTurbo™," SAE Technical Paper 2018-01-0970, 2018, https://doi.org/10.4271/2018-01-0970.
Data Sets - Support Documents
|Unnamed Dataset 1|
- Winterbone , D. , Benson , R. , Mortimer , A. , Kenyon , P. et al. Transient Response of Turbocharged Diesel Engines SAE Technical Paper 770122 1977 10.4271/770122
- Tufail , K. , Winstanley , T. , Karagiorgis , S. , Hardalupas , Y. et al. Characterisation of Diesel Engine Transient Pumping-Loss and Control Methodology for Transient Specific Fuel Consumption (SFC) SAE Technical Paper 2009-01-2748 2009 10.4271/2009-01-2748
- Rakopoulos , C. , Dimaratos , A. , Giakoumis , E. , and Peckham , M. Experimental Assessment of Turbocharged Diesel Engine Transient Emissions during Acceleration, Load Change and Starting SAE Technical Paper 2010-01-1287 2010 10.4271/2010-01-1287
- Terdich , N. , Martinez-Botas , R. , Howey , D. , Copeland , C. et al. Off-Road Diesel Engine Transient Response Improvement by Electrically Assisted Turbocharging SAE Technical Paper 2011-24-0127 2011 10.4271/2011-24-0127
- Sexton , P. , Smithson , R. , and McIndoe , G. Progress in Demonstration Prototypes Using the Continuously Variable Planetary Technology in a C-Class RWD Car and a Fork Lift Truck SAE Technical Paper 2015-01-1104 2015 10.4271/2015-01-1104