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K Hybrid Fuel Efficiency In addition to Army internal hybrid studies, there have been a number of hybrid studies initiated with some completed by the major defense industry suppliers. Some of those efforts are summarized below. Oshkosh Defense presently offers in production a series hybrid diesel-electric power train system called ProPulseÂ® on its Heavy Expanded Mobility Tactical Truck (HEMTT-A3) and Medium Vehicle Replacement (MTVR). Reportedly, this system increases the HEMTT fuel economy by up to 20 percent versus the non-hybrid version. The system also is capable of providing up to 120 kW of electrical power to external users. BAE Systems recently received a $32 million agreement to develop a 35-ton series diesel-electric hybrid Bradley Fighting Vehicle. QinetiQ, a partner on this project, is developing the electric cross drive transmission (Modular E-X-Drive). As another example, General Dynamics Land Systems completed a drive evaluation in 2009 of a series hybrid âE-Drive Stryker,â part of an internal R&D project. Using independent electric hub-drives, it leveraged the existing architecture and hardware of the Advanced Hybrid Electric Drive (AHED) vehicle, developed by GDLS from 1999 to 2007. It was subsequently dropped as the integration of braking, motoring, and gearing into the independent wheel hubs proved to have problematic reliability. Overseas suppliers have also been active in military vehicle hybrids as shown by the below hybrid powerpack (civilian rail) and land defense marketing materials from MTU Solutions (Figure K.3). PREPUBLICATION COPY â SUBJECT TO FURTHER EDITORIAL CORRECTION K-1
FIGURE K.1 ProPulse Hybrid Diesel-Electric System. SOURCE: Oshkosh Defense. Undated. Hybrid Diesel-Electric System. Online. https://oshkoshdefense.com/wp-content/uploads/2019/02/ProPulse_SS_6- 13-11.pdf. Accessed November 2020. PREPUBLICATION COPY â SUBJECT TO FURTHER EDITORIAL CORRECTION K-2
FIGURE K.2 Hybrid Powerpack. SOURCE: Rolls-Royce Power Systems. Undated. Marketing Materials for the mBrid Hybrid Powerpack. Online. Available at https://www.mtu-solutions.com/cn/en/applications/rail/railcar- powerpacks/hybrid-powerpack.html. Accessed November 2020. PREPUBLICATION COPY â SUBJECT TO FURTHER EDITORIAL CORRECTION K-3
FIGURE K.3 Advanced Propulsion System Technologies. SOURCE: Rolls-Royce Power Systems. Undated. Marketing Materials for the MTU Land Defense Systems. Online. Available at https://www.mtu- solutions.com/cn/en/applications/defense/land-defense-solutions.html. Accessed March 2021 PREPUBLICATION COPY â SUBJECT TO FURTHER EDITORIAL CORRECTION K-4