Review of the 21st Century Truck Partnership Third Report (2015) / Chapter Skim
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5 Vehicle Power Demands
5 Vehicle Power Demands
Pages 85-101
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From page 85... ...
The various uses of the tion, pumps, and other accessories on the engine needed to engine power (overcoming rolling resistance, overcoming meet emissions certification. The column titled "accessories" aerodynamic drag, power train losses, auxiliary loads)
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From page 86... ...
Also, the goals do not include the effect of energy density of the fuel used and do The 21CTP Roadmap and Technical White Papers (2013) not allow for other energy sources such as solar power or off- offer five technology goals for vehicle power demands.
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From page 87... ...
Accomfrom the DOE Annual Merit Review and other publications. plishments to date include full-scale wind tunnel testing of Table 5-1 lists the projects affiliated with the 21CTP that are two tractors, three trailers, and 23 devices.
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From page 88... ...
The Partnership has not accepted a 40 percent stretch goal and has put the greatest part of its effort into the SuperTruck Response to Recommendations from NRC Phase 2 Review program. This program is focused on an idealized tractor trailer combination rather than a real-world mix of tractors R5-1 NRC Phase 2 Recommendation 5-1.
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From page 89... ...
6 S Lew, Michelin North America, Inc., "Test Methods for Truck Tire Rolling Resistance and Reducing Fuel Consumption of M-D and H-D Ve- 7 Jens Kleffmann, Continental, "Effect of Tire Inflation on Rolling hicles," Presentation to the Committee on Assessment of Technologies and Resistance," Presentation to NRC Committee on Assessment of TechnoloApproaches for Reducing the Fuel Consumption of Medium- and Heavy- gies and Approaches for Reducing the Fuel Consumption of Medium- and Duty Vehicles, Phase 2, on November 21, 2013.
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From page 90... ...
SOURCE: S Lew, Michelin North America, Inc., "Test Methods for Truck Tire Rolling Resistance and Reducing Fuel Consumption of M-D and H-D Vehicles," Presentation to the Committee on Assessment of Technologies and Approaches for Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles, Phase 2, on November 21, 2013.
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From page 91... ...
The Partnership agrees that lack of consistent rolling resistance measurement could be a barrier to increased acceptance of NRC Phase 2 Recommendation 5-3. Wide-Base Single Tire NGWBS tires, along with the lack of education for fleets and Retrofits: The 21CTP should consider producing a comprehen owner-operators on the benefits of low rolling resistance tires.
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From page 92... ...
. Of significance is be reduced with reductions in tire rolling resistance, the the statement, "use good engineering judgment to simulate limits to such reductions must be carefully weighed against all engine work inputs and outputs as they typically would tire traction and the ability of vehicles to attain safe stop- operate in use." This statement leaves open to estimates and ping distances.
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From page 93... ...
WEIGHT REDUCTION Weight reduction is beneficial if it can be reliably trans Truck weight reduction affects fuel consumption by lated into more freight to be carried or reduced fuel consumpreducing tire rolling resistance and unrecovered energy tion. Vehicles carrying freight in or on a trailer can either used when accelerating or climbing a grade.
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From page 94... ...
, magne"increased focus on manufacturing technologies that reduce sium alloys (40-70 percent weight reduction) , carbon fiber the cost penalty associated with more expensive lightweight composites (30-65 percent weight reduction)
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From page 95... ...
the introduction to this chapter, current regulations for fuel The project will ultimately develop forming technology that consumption and greenhouse gas emissions are now based enables Al sheet to replace steel sheet, which, together with on load specific fuel consumption. Therefore, a key goal for molded fiberglass-reinforced composite panels and compo- weight reduction is translating it into usable freight that can nents, will provide individual panel and component weight be transported.
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From page 96... ...
Whether batteries are used for starting the niques for mitigating the temperature of the exhaust vehicle, hotel loads for the driver, the air conditioning to protect personnel and materials external to the truck system, a hybrid power train, or a trailer refrigeration (such as hay under a truck in a field that is being har- unit, thermal management of the battery is extremely vested) were devised by several OEMs.
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From page 97... ...
information on driveline power demand and consider updates to this study. The Partnership will review research results from the SuperTruck teams to gather current technology information Response to Recommendations from the NRC Phase 2 for power demand, and revise assessments of power demand as Review appropriate.
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From page 98... ...
, and government/ was formed in 2002. As improvements in aerodynamic regulatory (ORNL, Clean Cities, South Coast Air Quality drag and tire rolling resistance have been made, the relative Management District [SCAQMD]
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From page 99... ...
Lawrence Livermore National Labo velopment of High Power Density Driveline for Vehicles (Developing ratory. DOE Annual Merit Review VSS006, Livermore, Calif., June 19.
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From page 100... ...
National Renewable Energy Laboratory. DOE Annual Merit Review you may show by engineering analysis that disregarding VSS097, Washington, D.C., June 17.
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From page 101... ...
Refer to the standard-setting part what signals you simulate and explain why these signals to determine the specifications for your duty cycle(s)
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