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1DISTRIBUTION A. See first page.
U.S. ARMY COMBAT CAPABILITIES DEVELOPMENT COMMAND –GROUND VEHICLE SYSTEMS CENTER
Kevin Boice
Ground Vehicle Power and Mobility
CCDC GVSC
Combat Vehicle Electrification Overview and Motivation
DISTRIBUTION A. Approved for public release; distribution unlimited.OPSEC #: 3641
2DISTRIBUTION A. See first page.
• Enable Advanced warfighting capabilities• Silent Mobility affects: audible (5:1
reduction) and thermal (10:1 reduction)• Directed Energy Weapons • Significantly Improved Sprint/Acceleration• Flexible/Open Hull of Vehicle – Series
Hybrid• Enables Transition to Fuel Cell and All
Electric for full time near silent mobility
COMBAT VEHICLE ELECTRIFICATION MOTIVATIONS
Today’s Acoustic
Detectability
Future Acoustic Detectability
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COMBAT VEHICLE ELECTRIFICATION CHALLENGES
KeyCharacteristics
Hybrid (Power Electronics) All-Electric (Energy Storage) Fuel CellPower
DensityTemperature
Threshold Capacity
(300 mile range)Charge Rate Hydrogen
StorageCurrent / Army or Industry
3kW/L 85C Coolant ~0.15kW/L (best Li Ion)
100 kW 3.4MJ/L
Future ArmyRequirement
12kW/L 105C CoolantEngine coolant
0.60 kW/L 6 MW 13.6MJ/L
ImprovementRequired
4x 24% 4x 60x 4x
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ELECTRIFIED POWERTRAIN CONCEPTS
Current R&D Focus
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TRACK AND SUSPENSION CONSIDERATIONS
5
SprocketSprocket
PEM 1 – Single sprocket, single track strand per side
PEM 2 – Dual sprocket, single track strand per side
PEM 3 – Dual sprocket, dual track strands per side
Sprocket Idler
Sprocket Sprocket IdlerIdler
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VEHICLE CONE INDEX (VCI) ANALYSIS
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IN SPROCKET PACKAGING
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• Selected single sprocket, single track strand per side (PEM 1) for project
• Dual sprocket, dual track strands per side (PEM 3) had impacts to soft soil mobility (VCI) due to decreased ground contact
• Dual sprocket, single track strand per side (PEM 2) has challenges with packaging density of motors and track tensioning design. Will continue to investigate for future, but not current project
• Single sprocket, single track strand per side (PEM 1) met mobility requirements and had less packaging and cost difficulties
CURRENTLY PURSUED EXTERNAL ARCHITECTURE
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INTERNAL ARCHITECTURE CONSIDERATIONS
Move bulkhead ~13 inches
75% motor growth available
Independent Sprocket Drives
Motor Driven Modern Transmission
Controlled Steering Differential
80% motor growth available
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INTERNAL ARCHITECTURE CONSIDERATIONS
• Common components allow modularity and scalability
• Follows 600VDC Military Standard (MIL-PRF-GCS600A)
• Can parallel converters, batteries, motors, fuel cells, and generators
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PERFORMANCE ESTIMATES
• Package in vehicle and meet / exceed performance requirements
• Modularity allows re-use across vehicle weight classes (OMFV, RCV, OMT)
