Vehicle Efficiency Technologies and Fuel Savings Overview
This article discusses the impact of efficiency standards and vehicle technologies on consumer fuel savings. It explores the background of automobile efficiency, advancements in efficiency technologies, and the rise in fuel economy standards. The content highlights the evolution of vehicle efficiency, including improvements in engine technologies, transmission systems, vehicle load reduction, and hybridization. Consumers can expect to see significant improvements in fuel economy as regulations and standards promote the adoption of energy-efficient practices.
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Presentation Transcript
Efficiency standards, vehicle technologies, and consumer fuel savings Nic Lutsey, Ph.D. March 20, 2014
Overview Automobile efficiency Background, efficiency standards Efficiency technologies Impact on fuel costs Commercial freight truck efficiency Background, efficiency standards Efficiency technologies Impact on fuel costs 2
Automobile fuel economy background Average new vehicle fuel economy remained at 19-22 mpg from 1980-2009 Horsepower has doubled since 1980, and vehicles have gotten heavier and larger Vehicle technology has advanced, but not toward increased fuel economy Fuel prices since 2011 have been twice as high as in the 1990s and more unstable 3 Adjusted label fuel economy from US EPA Trends report http://www.epa.gov/otaq/fetrends.htm; US EIA fuel prices: http://www.eia.gov/forecasts/steo/realprices/
Automobile efficiency on the rise California s Pavley Assembly Bill 1493 of 2002 Breaks decades-long stagnation creates standards for 2009-2016 May 19, 2009: Agreement on 2012-2016 standards ( 35.5 mpg ) July 29, 2011: Agreement for 2017-2025 standards ( 54.5 mpg ) NY Times Bloomberg 4
Automobile efficiency on the rise In 2004, California adopted the first greenhouse emission regulation, for light duty vehicles through model year 2016 Since, California and federal agencies collaborated on standards through 2025 Consumers will see fuel economy go from 19 to 38 miles per gallon (mpg) 39 mpg CAFE regulation 24 mpg Consumer fuel economy 19 mpg 5 US EPA Trends report http://www.epa.gov/otaq/fetrends.htm; US EPA/NHTSA 2012-2016 and 2017-2025 greenhouse gas emission and fuel economy standards: http://www.epa.gov/otaq/climate/regs-light-duty.htm
Automobile efficiency: Technology Light-duty vehicles have many energy losses (thermodynamic, accessory, friction, aerodynamic, tire, braking, etc) that can all be greatly reduced for 40-60% energy use and CO2 reductions Percent CO2 and fuel consumption improvement for given technologies are shown These technologies are all available in some variation in the marketplace today Engine Engine friction reduction 3-4% Cylinder deactivation 5-6% Cam phasing 4-5% Variable valve lift 4-5% Turbo direct injection 12-15% Turbo cooled EGR 21-24% Transmission Torque convertor lock up 0-1% Aggressive shift logic 2% High efficiency gearbox 6-speed automatic 2% 8-speed automatic 6-8% Dual clutch Continuously variable 6-10% Vehicle load reduction Low-drag brakes 1% Electric power steering 1% Improved accessories 2-4% Tires 2-4% Aerodynamics 2-5% Lightweighting 5-20% 3-4% Hybridization 12V Stop-Start 5-7% High-voltage mild 6-8% Parallel hybrid 20-35% 9-13% 6 Sources: US EPA, NHTSA, CARB, 2011-2012 regulatory assessments
Automobile efficiency: New models Recent technology deployments are increasing fuel economy by 25-50% Engine, transmission, aerodynamic, lightweighting available across vehicle types Hybrid technology goes further; electric vehicle technology goes much further Label fuel economy (mpg) increase Fuel economy percent change CAFE (mpg) increase Model Technologies 2012 Subaru Impreza 29.3 40.4 22 30 38% Continuously variable transm., variable valve timing, 160-lb mass red. 2014 Mazda Mazda3 2.0L 35.9 45.9 27 34 28% Direct injection, 6-speed auto., 100-lb mass reduction 2014 Mazda Mazda3 2.5L 32.7 43.5 25 32 33% Direct injection, 6-speed auto., 100-lb mass reduction, mild hybrid 2013 Volkswagen Jetta 2014 Dodge Dart Aero 2012 BMW 328i 2014 Bentley Continental 2013 Ford Explorer 2014 Range Rover 2014 Jeep Grand Cherokee 2013 GMC K15 Sierra 31.6 46.2 25 34 46% Diesel, automated manual transmission 31.9 43.2 24 32 35% Turbo, variable valve lift, dual clutch transmission 28.5 36.7 22 26 29% Turbo, direct injection, 8-speed auto 16.2 23.6 13 18 46% Direct injection, variable valve lift, cylinder deact., 8-speed 20.8 29.8 16 23 43% Turbo, direct injection, 6-speed automatic 18.5 24.8 14 19 34% Supercharger, 8-speed transm., 700-lb mass reduct., stop-start 21.7 31.2 17 24 44% Diesel, 8-speed automatic, aerodynamics 19.0 24.4 15 19 28% Direct injection, cylinder deactivation, 6-speed automatic 7 Source: Model year 2010-2014 vehicle fuel economy testing; from US EPA fuel economy guide data file: https://www.fueleconomy.gov/feg/download.shtml
Efficiency technologies: Driving costs down Due to increased fuel economy standards, new vehicles will see a reduction in fuel consumption by over 40% from 2012 to 2025 Per-mile fuel costs reduced from $0.16 $0.09 per mile Annual per-vehicle fuel bill are reduced from $1,900 $1,100 per year 21 mpg 24 mpg 38 mpg 8 US EPA Trends report http://www.epa.gov/otaq/fetrends.htm; US EPA and NHTSA 2012-2016 and 2017- 2025 greenhouse gas emission and fuel economy standards: http://www.epa.gov/otaq/climate/regs-light- duty.htm; US EIA fuel prices: http://www.eia.gov/forecasts/steo/realprices/
Electric-drive: Much lower annual driving costs Shifting from average gasoline vehicle to an electric vehicle goes much further in reducing annual vehicle energy costs: At $0.20 per kWh, drops annual average fuel bill by over 50% At $0.10 per kWh, drops annual average fuel bill by over 75% 21 mpg 24 mpg 38 mpg Electric vehicle @ $0.20/kWh Electric vehicle @ $0.10/kWh 9 US EPA Trends report http://www.epa.gov/otaq/fetrends.htm; US EPA and NHTSA 2012-2016 and 2017- 2025 greenhouse gas emission and fuel economy standards: http://www.epa.gov/otaq/climate/regs-light- duty.htm; US EIA fuel prices: http://www.eia.gov/forecasts/steo/realprices/; Electric vehicle based on 0.34 kWh/mile
Truck efficiency on the rise, too Industry and fleet efforts, US EPA SmartWay program, and California greenhouse gas tractor-trailer rule have led the push for increased efficiency May 21, 2010: First truck efficiency standards ( Phase 1 ) Feb. 18, 2014: Announcement of next phase of standards ( Phase 2 ) 10
Truck efficiency: Technology Heavy-duty vehicles have many energy losses (thermodynamic, accessory, friction, aerodynamic, tire, etc) that can all be greatly reduced for total of 30- 45% energy use reduction. Percent CO2 and fuel consumption improvement for given technologies are shown Tractor Tires: 1-3% Aerodynamics: 2-4% Engine idle-off: 5-6% Lightweighting: 2% Engine Friction, load reduction: 1-2% Aftertreatment: 1-3% Advanced control, injection: 1-3% Turbo, air handling: 1-2% Turbocompounding: 2-5% Waste heat recovery: 4-8% Trailer Tires/wheels: 1-6% Aero skirt: 3-5% Aero gap: 1-3% Aero tail: 3-5% Lightweighting: 2-5% Transmission Direct drive: 1% Single drive: 1-2% Friction reduction: 1-2% Automated manual: 2-8% Dual clutch: 2-10% Sources: EPA, 2011; NRC, 2010; TIAX, 2012; ICCT, 2013 (http://www.theicct.org/trailer-technologies-increased-hdv-efficiency, http://www.theicct.org/ghg-reduction-potential-heavy-duty-vehicles-eu) 11
Truck efficiency: Cost reductions Due to increased efficiency standards, new Class 8 tractor-trailers could see a reduction fuel consumption by up to 40% Tractor-trailer efficiency could increase from 6 mpg ~10 mile per gallon Per-ton-mile freight fuel costs reduced from $0.36 $0.20 per ton-mile 12 Based on US EIA Annual Energy Outlook (diesel prices), Transportation Energy Data Book (historical vehicle fuel economy); US EPA/NHTSA 2014-2018 rulemaking, assuming 38,000 lb payload for high-roof sleeper cab Class 8 tractor-trailer
Conclusions Great potential for increasing the efficiency in the transportation sector with cost-effective emerging technologies Advanced engines, transmissions, aerodynamics, lightweighting, etc Efficiency improvements are on the way due to new light-duty efficiency (and greenhouse gas emission) standards through 2025 Consumers will save ~40% on per-mile and annual fuel costs Efficiency improvements are on the way, due to new heavy-duty efficiency (and greenhouse gas emission) standards in 2025+ timeframe Shippers, retailers,(and indirectly consumers ) could save up to ~40% on per-ton-mile shipping costs 13 Based on US EIA Annual Energy Outlook, Transportation Energy Data Book; US EPA/NHTSA 2014-2018 rulemaking, assuming 38,000 lb payload for high-roof sleeper cab Class 8 tractor- trailer
Thanks! nic@theicct.org 14
