Presentation on theme: "Motivation for full automation – we need it … yesterday & tomorrow Energy Efficiency through Automation Tyler Folsom, PhD, PE QUEST Integrated, Inc. 91."— Presentation transcript:
Motivation for full automation – we need it … yesterday & tomorrow Energy Efficiency through Automation Tyler Folsom, PhD, PE QUEST Integrated, Inc. 91 st Meeting of the Transportation Research Board of the National Academy Jan. 22, 2012, Washington DC
Time Frames Business: Next quarter; fiscal year Politics: Next election Transportation planners: 30 years Iroquois nation: 7th generation
$$$ The economy is a wholly owned subsidiary of the ecosystem. - Robert F. Kennedy Jr. Lovins in Reinventing Fire finds that it is possible for the U.S. to eliminate all petroleum, coal and nuclear energy by 2050 with a savings of $3.8T in transportation while increasing transport volume. Renewable energy is more job intensive than oil or coal. Gilbert and Perl in Transport Revolutions chart how the U.S. and China can each eliminate oil by 2030.
National Security European countries fought wars over access to salt. Making oil no more strategic than salt eliminates the need to protect resources militarily. There is evidence that the demand for oil is peaking before the supply peaks. A gallon of gasoline delivered to Afghanistan costs $25 to $45.
Reasons to eliminate oil Environmental: Pollution, sustainability, global warming National security: Devalue the principal asset of unfriendly countries Business: High oil prices, high oil volatility, better opportunities elsewhere
ElectricYearPriceRange Tesla roadster2008$100,009244 Nissan Leaf2011$33,000100 Mitsubishi MiEV2009$29,00062-100 Coda2012$41,000150 Toyota Scion IQ201250 BMW i32013$35,000100 Plug-in hybridsYearPriceRange Chevy Volt2011$40,00040 Toyota Prius plug-in2012$32,00015 GasolineYearPricempg Volkswagen SL12013230 Announced cars
Transport Revolutions Britain's move to railways, starting in 1830. Substantial reversal of automobile travel in the U.S. during World War II. The change from ships to planes for transatlantic travel. The introduction of high speed rail from 1960 to 1985. The use of air freight starting in 1980.
U.S. driving habits 5% use mass transit. Average bus occupancy is 8.8 people. 88% drive to work with 76% traveling alone. Average trip to work is 12 mi @ 28 mph. 19% of trips are to work. 30% of trips are social and recreational. Average car occupancy is 1.57 people. 65% of miles driven are urban.
Energy to move vehicle Power = K1*V + K2 * V3 For a car, rolling resistance is dominant until 35 mph. For a light vehicle, air drag takes over at 12 mph.
Energy to overcome rolling resistance dW/dt = C V /η Σm·g[C R +s/100+a/g(1+m W /Σm)] C V : Speed of vehicle η: Overall mechanical efficiency of transmission Σm: Total mass of vehicle, rider and baggage g: Gravitational acceleration C R : Coefficient of rolling resistance s: Upslope (%) a: vehicle acceleration m W : Effective rotational mass of wheels
Safety allows smaller vehicles 93% of accidents are caused wholly or in part by human factors. 41% of fatal accidents involve alcohol. Annual U.S. economic cost of accidents is $230B. Autonomous trains are an order of magnitude safer than manual trains. When all vehicles are computer controlled, a motorcycle is almost as safe as an SUV.
Energy to overcome aerodynamic drag dW/dt = 0.5 C V /η C D A ρ (C V +C W ) 2 C V : Speed of vehicle η: Overall mechanical efficiency of transmission C D : Aerodynamic drag coefficient A: Frontal area of vehicle and rider ρ: Air density C W : Headwind
Motorcycle1.8 Bicycle1.1 Bus0.6 – 0.8 Toyota Prius0.26 Pod car0.20 Urbee0.15 Supersonic fighter 0.016 Drag coefficients Urbee is a two passenger car designed for sustainability
City driving cycles Typical light rail: 15.5 mile line. Scheduled time is 38 minutes. Average speed = 24.5 mph or 22 mph with wait. Average speed (mph) Maximum speed (mph) Time stopped or decelerating (%) U.S.A.195643 Europe207425 Japan154352
1000 mpg is possible An electric pod-car has travelled 62 miles in one hour on two ordinary lead-acid batteries; equivalent to 2200 mpg. Practical vehicles weighing less than the rider can achieve a 30 mile range from a 20 lb battery; refueling by battery swap becomes practical. Even if pod-car electricity comes from coal, U.S. carbon savings can be equivalent to 12 trains of 100 coal cars daily.
Details and references T. C. Folsom, Social Implications of Autonomous Urban Land Vehicles, IEEE Technology and Society Magazine, Spring, 2012. T.Folsom @ qi2. com www. enviroteach. com
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