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)