400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2001-01-2773 Hybrid Electric Systems for 20-Ton Platforms Carl Johnson National Automotive Center, U.S. Ar my Tank-automotive and Armaments Command Lorin Dueck United Defense L.P . International Truck and Bus Meeting and Exhibition Chicago, Illinois November 12-14, 2001Downloaded from SAE International by University of British Columbia, Thursday, August 02, 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 University of British Columbia, Thursday, August 02, 2018 2001-01-2773 Hybrid Electric Systems for 20-Ton Platforms Carl Johnson National Automotive Center, U.S. Army Tank-automotive and Armaments Command Lorin Dueck United Defense L.P. ABSTRACT Hybrid electric propulsion has matured to the point that it is in production for small vehicle platforms. Work still needs to be done on adapting the technology for heavier weight classes. The dramatic increase in fuel efficiency, the exhaust emission reductions and the availability of an on-board source of high-power electrical energy for auxiliary systems are important for the commercial and military market. The U.S. Army's National Automotive Center (NAC) in Warren, MI, and United Defense L.P. (UDLP) in San Jose, CA, have developed a series hybrid 20-ton tracked military vehicle to explore this technology. This paper describes this work and its application to the other hybrid programs. INTRODUCTION Hybrid electric propulsion systems are one approach to producing more fuel-efficient, heavy vehicles. Both the Army and private industry desire the advantages promised by this technology . The Army desires the enhanced range and reduced logistics train, while commercial transportation desires the fuel savings and associated reductions in cost of doing business. In addition, the Army is undergoing a transformation from the heavy forces of the cold war era to a lighter, more transportable force that is more responsive to today’s varied conflict envir onment. When speaking of a lighter force, the term “lighter” is relative. To the Army, “lighter” means a gross vehicl e weight (GVW) of 20 tons. This has generated significant interest in hybrid electric propulsion systems for weight classes well beyond the current span of production vehicles. However, by exploiting recent advances in technology and integration techniques, which make heavier vehicles practical, the Army can reach these weight classes. The production of new vehicles is only one part of the creation of the more deployable force. The Army has a large “legacy” force. Many of these vehicles are within the weight range required but must be enhanced in performance and demonstrate improvements in reliability, maintainability, and efficiency before becoming viable candidates for inclusion into the future force. The M113 Armored Personal Carrier (APC) is such a legacy vehicle. An M113 rebuild program, which includes a hybrid e