Review of the 21st Century Truck Partnership, Second Report (2012) / Chapter Skim
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5 Vehicle Power Demands
5 Vehicle Power Demands
Pages 78-91
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From page 78... ...
Also illustrated in Figure 5-1 is the tire-rolling-resistance power consumption.2 Figure 5-1 indicates that these two sources of power consumption are equal at about 50 mph, while rolling resistance power consumption is about twice TABLE 5-1 Heavy-Duty Truck Power Consumption that because of aerodynamic drag at 37 mph, when the (each hour) tractor-trailer is equipped as a 2008 model pre-SmartWay3 combination vehicle.
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From page 79... ...
: Reduce essential auxiliary loads by hardware demonstrations, and validate and deploy cost 50 percent. (The baseline for this goal is a Class 8 effective, reliable, and durable technologies that reduce vehi highway tractor-trailer with sleeper, operating 5 days cle power demands.
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From page 80... ...
The study clearly is an Engineers (SAE) protocols (e.g., SAE J1263 coast-down test- excellent one, with very thorough evaluation of numerous ing; SAE J1321, Type II over-the-road testing with control candidate design improvements for all three of the trailer truck)
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From page 81... ...
these aerodynamic components. The SmartWay program has provided an important TIAX Summary visibility in the heavy-duty truck industry to the benefits of adapting manufacturer-developed aerodynamic trailer TIAX provided data on the performance of a collection features and low-rolling-resistance tires.
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From page 82... ...
These projects will provide appropriate next steps under the A common 18-wheeler highway tire specification for 21CTP for many of the vehicle power demand topics. today (pre-low rolling resistance)
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From page 83... ...
Nelson, Michelin Tire North America, "Truck Tires and Rolling Resistance," presentation to the National Research Council Committee to Assess Fuel Economy Technologies for Medium- and bitmap Heavy-Duty Vehicles, February 4, 2009, Washington, D.C.
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From page 84... ...
Most Class 8 reduced rolling resistance for the tires of the combination tractor-trailer combination trucks can benefit from the fuel tractor-van trailer, rather than for the tractor drive wheels consumption reductions contained in NGWBSTs. There are only, because improved-performance trailer tires are equally some application issues that carriers must become aware of, important to realizing the full benefit of reduced rolling such as trailer spread-axle configurations.
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From page 85... ...
In Table 5-1, auxiliary load is identified as 9 percent of the demand on the engine. A 50 percent Truck weight reduction affects fuel consumption by reduction, to 4.5 percent of the demand, would provide a corre- reducing tire rolling resistance and unrecovered energy used sponding 4.5 percent reduction in fuel consumption on a level when accelerating or grade climbing.
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From page 86... ...
funded under the SuperTruck projects themselves. trailer application, the fuel-consumption reduction is only about 0.5 percent per 1,000 lb of tare weight reduction, Weight-Reduction Goals because payload remains constant (NESCCAF/ICCT, 2009, p.
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From page 87... ...
Furthermore, the NRC Phase 1 report suggested and ORNL will explore the possibility of improving the duc- that it should be the responsibility of the truck manufacturers tility of magnesium and its low-temperature formability. The to take the next steps of system integration, product validaresearchers will also explore the development of new joining tion, and production application of lightweight materials.
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From page 88... ...
Such a two-phase SuperTruck projects provide a unique opportunity to bring heat-transfer system with a net higher heat-transfer than a together manufacturers and suppliers for coordinated sysconventional nonboiling cooling system further supports the tems R&D. notion to reduce radiator size (ANL, 2009b)
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From page 89... ...
power demand. To represent only the power consumptions of The DOE presented fuel and lubricants development vehicle power demand, it is appropriate that the term "powplans to the committee.9 The DOE suggested that it might ertrain" be removed from the Goal 5.b statement.
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From page 90... ...
2008. Final Regulation Order to Reduce vehicle power demands: Project prioritization by the 21CTP Greenhouse Gas Emissions from Heavy-Duty Vehicles.
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From page 91... ...
2011. Low Rolling Resistance Tires Gain Traction NESCCAF/ICCT (Northeastern States Center for a Clean Air Future/Inter- with Carriers Seeking to Save Fuel, Money.
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