400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2001-01-2794 Hybrid Propulsion Truck Platform Dually Developed by the U.S. Army and DaimlerChrysler Hal Almand National Automotive Center, U.S. Ar my Tank-automotive and Armaments Command William Doolittle and Gerry Klees For DaimlerChrysler Corporation International Truck and Bus Meeting and Exhibition Chicago, Illinois November 12-14, 2001Downloaded from SAE International by Purdue University, Sunday, August 19, 2018Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department. To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. ISSN 0148-7191 Positions and opinions advanced in this paper are those of the aut hor(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by whic h discussions will be printed with the paper if it is p ublished in SAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishing to submit papers to be c onsidered for presentation or publication thr ough SAE should send the manuscript or a 3 00 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in theGlobal Mobility DatabaseDownloaded from SAE International by Purdue University, Sunday, August 19, 2018 2001-01-2794 Hybrid Propulsion Truck Platform Dually Developed by the U.S. Army and DaimlerChrysler Hal Almand National Automotive Center, U.S. Army Tank-automotive and Armaments Command William Doolittle and Gerry Klees For DaimlerChrysler Corporation ABSTRACT This paper provides an overview of the Hybrid Electric Commercially Based Tactical Truck (COMBATT), a collaborative program between the U.S. Army Tank-automotive and Armaments Command’s (TACOM) National Automotive Center (NAC) and the DaimlerChrysler Hybrid Electric Vehicle Platform Engineering Group. As part of the 21 st Century Truck Initiative, the COMBATT plat forms represent the class 2b (light) trucks. The platforms contain all of the utility and enhanced off-road capabilit y features of the baseline COMBATT platform plus the second generation of a hybrid propulsion system incorporating an integral auxiliary power supply. The hybrid feature increases fuel efficiency, expands operational capability by providing a limited range electric propulsion mode, and enables an extended auxiliary electrical power supply capability. The auxiliary power supply provides up to 20kW of continuous electric power and 30kW of peak electric power for on- or off-board applications. INTRODUCTION The COMBATT program was initiated as a means of developing a commercially based military truck that would satisfy many of the per formance attributes of the current HMMWV at a significantly lower cost. Further, objectives of the COMBATT vehicle were to reduce the military’s logistics footpr int, operations, service, and overall lifecycle cost, while providing a vehicle that delivers off-road mobility, increased load carrying, and robustness. Combining these vehicle attributes with DaimlerChrysler’s hybrid vehicle technology and integral electric auxiliary power supply will result in a new type of military vehicle with exc eptional mobility and utility. BACKGROUND The Army has developed and fielded the best-recognized Light Tactical Wheeled Vehicle (LTWV) in the world, the High Mobility Multipurpose Wheeled Vehicle or HMMWV. Designed in the early 1980s, the HMMWV has been in continuous production ever since. With many vehicles now approaching 20 years of age, future concepts are being considered. One of the most innovative approaches, supported by the NAC, is to adapt a modifie