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Logistics and Capability Implications of a Bradley Fighting Vehicle with a Fuel Cell Auxiliary Power Unit

Delphi Corporation-Joseph Conover, Harry Husted, John MacBain
US Army TACOM-Heather McKee
Published 2004-03-08 by SAE International in United States
Modern military ground vehicles are dependent not only on armor and munitions, but also on their electronic equipment. Advances in battlefield sensing, targeting, and communications devices have resulted in military vehicles with a wide array of electrical and electronic loads requiring power. These vehicles are typically designed to supply this power via a main internal combustion engine outfitted with a generator. Batteries are also incorporated to allow power to be supplied for a limited time when the engine is off. It is desirable to use a subset of the battlefield electronics in the vehicle while the engine is off, in a mode called “silent watch.” Operating time in this mode is limited, however, by battery capacity unless an auxiliary power unit (APU) is used or the main engines are restarted. Integration of a solid oxide fuel cell (SOFC) auxiliary power unit into a military vehicle has the potential to greatly extend silent watch operating time and capabilities while significantly reducing fuel use.In this paper the results of a study are presented which show the fuel…
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Dual Voltage Electrical System Simulations

Delphi Automotive Systems, Energenix Center-John A. MacBain
EDS at Delphi Automotive Systems, Energenix Center-Joseph Conover
Published 2000-08-21 by SAE International in United States
A recent SAE paper entitled “Automotive Electrical Systems: Architecture and Components” by Iftikar Khan1 explored many potential electrical hardware and architectural issues for future vehicles. For these concepts to become viable in the marketplace, effective and competitive engineering practice requires that the design and trade studies be performed in the virtual world with hardware prototype validating the design rather than traditional build / break design cycles. This paper studies simulation requirements for such systems including component technical requirements and ease of calibration to specific hardware and proposed designs. This paper will demonstrate modeling techniques for generators (averaged, 3 phase, 14V, and 42V), DC to DC converters, lead acid batteries, and lithium polymer batteries. The viability of the methods will be demonstrated and validated at the component level. These validated component models will then be assembled into systems targeting both a single voltage 42V volt system and dual 42/14 volt systems. One example will demonstrate performance over an entire drive cycle. The high frequency interaction of components will also be demonstrated including both a 42V load…
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