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An Analysis of Assisted Turbocharging with Light Hybrid Powertrain
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2006 by SAE International in United States
Annotation ability available
A “new” concept combining existing technologies of engine downsizing, electrically assisted turbocharging and light hybrid powertrain is proposed.
Published analysis of hybrid technology and data of production hybrid vehicles are used to show that much of the benefit is derived from engine downsizing. Engine downsizing results in operation more often at wider open throttle with reduced pumping work and higher efficiency conditions. Results from vehicles using turbocharged, downsized engines are used to further corroborate this conclusion. Fuel shut off during coasting and vehicle stopping/idling also contributes positively to fuel economy improvement.
In a “full hybrid” configuration, electric motor and battery energy is used to compensate for engine downsizing to get high torque at low speeds. Brake energy recovery is used to charge batteries. Published analysis is used to show that the equivalent of recovered brake energy is almost completely used up in carrying the extra weight of the full hybrid system, without any net benefit - except high torque at low speeds and more optimum operation of the downsized engine.
It is proposed that a light hybrid powertrain combined with (electrically) assisted turbocharging can get the same benefits without the extra weight and cost. Assisted turbocharging can be used to shape the torque curve and downsize the engine. Light hybrid configuration can be used for fuel cut-off during coasting and stopping/idling. A methodical optimization between turbo assist and light hybrid functionality can be used to optimize the benefits and minimize the impact on weight and cost. Experimental results showing the torque shaping capabilities of one example of assisted turbocharging - using an e-Turbo™ are presented. Published data on full and light hybrids are used to analyze the proposed configuration. It is shown that the “new” concept can give the same or better fuel consumption reduction than full hybrid systems without the added weight or cost.
CitationShahed, S., "An Analysis of Assisted Turbocharging with Light Hybrid Powertrain," SAE Technical Paper 2006-01-0019, 2006, https://doi.org/10.4271/2006-01-0019.
CI & SI Power Cylinder Systems and Power Boost Technology 2006
Number: SP-2013; Published: 2006-04-03
Number: SP-2013; Published: 2006-04-03
- Arnold S. Balis C. Jeckel D. Larcher S. Uhl P. Shahed S. M. “Advances in Turbocharging Technology and its Impact on Meeting Proposed California GHG Emission Regulations” SAE 2005-01-1852
- Petitjean D. Bernardini L. Middlemass C. Shahed S. M. “Advanced Gasoline Engine Turbocharging Technology for Fuel Economy Improvements” SAE 2004-01-0988
- “Effectiveness and Impact of Corporate Average Fuel Economy (CAFE) Standards (2002)” Transportation Research Board (TRB) The National Academies Press http://www.nap.edu/books/0309076013/html
- California Air Resources Board Staff Proposal Regarding the Maximum Feasible and Cost-Effective Reduction of Greenhouse Gas Emissions from Motor Vehicles June 14 2004
- Schwaderlapp M. Habermann K. Yapici K. “Variable Compression Ratio - A Design Solution for Fuel Economy Concepts” SAE 2002-01-1103
- Oak Ridge National Lab “Transportation Energy Data Book, 2003, Ed 23, Table 4.26”
- EPA website on fuel economy http://www.fueleconomy.gov/feg/byMPG.html
- Walzer P. “Future Powerplants for Cars” SAE 2001-01-3192
- Muta K. Yamazaki M. Tokieda J. “Development of New-Generation System THS II - Drastic Improvement of Power, Performance and Fuel Economy” SAE 2004-01-0064
- van Basshuysen R. Schafer F. Internal Combustion Engine Handbook SAE International
- Steinmaurer G. del Re Luigi “Optimal Energy Management for Mild Hybrid Operation of Vehicles with an Integrated Starter Generator” SAE 2005-01-0280
- Evans D.G. Polom M.E. Poulos S.G. van Maanen K.D. Zarger T.H. “Powertrain Architecture and Controls Integration for GM's Hybrid Full-Size Pickup Truck” SAE 2003-01-0085
- An F. Santini D.J. “Mass Impacts of Fuel Economies of Conventional vs Hybrid Electric Vehicles” SAE 2004-01-0572
- Unnewehr L.E. Auiler J.E. Foote L.R. Moyer D.F. Stadler H.L. “Hybrid Vehicle for Fuel Economy” SAE 760121
- Ogawa H. Matsuki M. Eguchi T. “Development of a Power Train for the Hybrid Automobile - the Civic Hybrid” SAE 2003-01-0083
- Heywood J. B. “Improving the Spark-Ignition Engine” 2005 Symposium, Engine Research Center University of Wisconsin Madison June 2005