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Mass Impacts on Fuel Economies of Conventional vs. Hybrid Electric Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 08, 2004 by SAE International in United States
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The strong correlation between vehicle weight and fuel economy for conventional vehicles (CVs) is considered common knowledge, and the relationship of mass reduction to fuel consumption reduction for conventional vehicles (CVs) is often cited without separating effects of powertrain vs. vehicle body (glider), nor on the ground of equivalent vehicle performance level. This paper challenges the assumption that this relationship is easily summarized. Further, for hybrid electric vehicles (HEVs) the relationship between mass, performance and fuel consumption is not the same as for CVs, and vary with hybrid types. For fully functioning (all wheel regeneration) hybrid vehicles, where battery pack and motor(s) have enough power and energy storage, a very large fraction of kinetic energy is recovered and engine idling is effectively eliminated. This paper assesses two important impacts of shifting from conventional to hybrid vehicles in terms of the mass vs. fuel economy relationship - 1) significant improvements in fuel economy with little or no change in mass, and 2) once a switch to hybrid powertrains has been made, the effectiveness of mass reduction in improving fuel economy will be diminished relative to conventional vehicles. In this paper, we discuss vehicle tractive load breakdowns and impacts of hybridization on vehicle efficiency, discuss capture of kinetic energy by conversion to electrical energy via regenerative braking, assess benefits of shutting off the engine when the vehicle does not require power, and investigate energy losses associated with vehicle mass.
CitationAn, F. and Santini, D., "Mass Impacts on Fuel Economies of Conventional vs. Hybrid Electric Vehicles," SAE Technical Paper 2004-01-0572, 2004, https://doi.org/10.4271/2004-01-0572.
SAE 2004 Transactions Journal of Fuels and Lubricants
Number: V113-4 ; Published: 2005-07-05
Number: V113-4 ; Published: 2005-07-05
- National Research Council, 2002, Effectiveness and Impact of Corporate Average Fuel Economy Standards, National Academy Press, Washington D.C.
- An, F., and Santini D.. 2003. “Assessing Tank-to-Wheel Efficiencies of Advanced Technology Vehicles,” SAE Paper No. 2003-01-0412, Society of Automotive Engineers, Warrendale, Pa.
- An, F., Vyas A., Anderson J., and Santini D.. 2001. “Evaluating Commercial and Prototype HEVs,” SAE Paper No. 2001-01-0951, Society of Automotive Engineers, Warrendale, Pa.
- An, F., DeCicco J., and Ross M., 2001, “Assessing the Fuel Economy Potential of Light Duty Vehicles,” SAE paper 2001-01FTT-31, Society of Automotive Engineers, Warrendale, PA
- Weiss et al., 2000, On the Road in 2020: A Life-Cycle Analysis of New Automobile Technologies, MIT Energy Laboratory Report No. MIT EL 00-003, Energy Laboratory, Massachusetts Institute of Technology, Cambridge, Mass., Oct.
- General Motors Corp., et al., 2001, Well-to-Wheel Energy Use and Greenhouse Gas Emissions of Advanced Fuel/Vehicle Systems - North American Analysis, Executive Summary Report, available electronically at Argonne National Laboratory's Transportation Technology Research and Development Center web sit http://www.transportation.anl.gov/ at document address http://www.tis.anl.gov.8000/db1/ttrdc/document/DD D/126.PDF.
- An, F., Stodolsky F., and Santini D., 1999, “Hybrid Options for Light-Duty Vehicles,” SAE paper 1999-01-2929, Reprinted from Electric and Hybrid Electric Vehicles and Fuel Cell Technology (SAE SP-1466), Society of Automotive Engineers, Warrendale, Penn., presented at the Future Transportation Technology Conference, Costa Mesa, Calif., Aug.
- Graham, R., et al., 2001, Comparing the Benefits and Impacts of Hybrid Electric Vehicle Options, Final Report, July 2000, Electric Power Research Institute, Palo Alto, Calif.
- Plotkin, S., et al., 2001, Hybrid Vehicle Technology Assessment: Methodology, Analytical Issues, and Interim Results, Argonne National Laboratory Report ANL/ESD/02-2, Argonne, Ill.
- Santini, D.J., et al., 2002, “Hybridizing with Engine Downsizing,” paper number 02-4095, 81st Annual Meeting of the Transportation Research Board, Washington, D.C., Jan. 13-17.
- Hellman, K.. and Heavenrich R., “Light-Duty Automotive Technology and Fuel Economy Trends: 1975 Through 2003”, EPA420-R-03-006, EPA, 2003.
- Toyota Hybrid System Press Release 1997 & 2001, Hybrid Synergy Drive, THSII, 2004
- Sovran G. and Blaser D., 2003, “A Contribution to Understand Automotive Fuel Economy and Its Limits, SAE Paper No. 2003-01-2070, Society of Automotive Engineers, Warrendale, Pa.
- Evans, D. G., et al., 2002, “Powertrain Architecture and Controls Integration for GM's Hybrid Full-Size Pickup Truck”, SAE Paper No. 2003-01-0085, Society of Automotive Engineers, Warrendale, Pa.
- Hermance, D. “New Efficiency Baseline 2004 Prius.” Presentation to the Electric Power Research Institute Plug-in Hybrid Electric Vehicle Workshop, Long Beach, CA. Nov. 15, 2003.
- Barth, M., An F., Younglove T., Scora G., Wensel T. and Ross Marc, 2000. NCHRP Project 25-11: Development of a Comprehensive Modal Emissions Model - the Final Report. National Research Council, Washington DC, 2001.
- An, F., and Aymeric Rousseau. 2001. “Integration of a Modal Energy and Emissions Model into a PNGV Vehicle Simulation Model PSAT,” SAE Paper No. 2001-01-0954, Society of Automotive Engineers, Warrendale, Pa
- Duoba M., Ng H., and Larsen R., In-Situ Mapping and Analysis of the Toyota Prius HEV Engine, SAE 2000-01-3096, 2000 FTT Costa Mesa, California Aug. 21-23, 2000
- Santini, D., and Anderson J., Some Evidence on Determinants of Fuel Economy as a Function of Driving cycle and Test Type, SAE931804, SAE Transactions (1993).