Truck & Off-Highway Engineering - October 2023 - 26

ORIGINAL
EQUIPMENT
GM Defense adapts Hummer EV for military concept vehicle
The military EV adds a 46-inch gun
The six-passenger Electric Military Concept Vehicle (eMCV) uses the production Hummer EV's
chassis and suspension system but with some modifications.
GM Defense announced in July 2022
that the U.S. Army selected it to provide
a battery-electric vehicle for analysis
and demonstration. As a subsidiary
of General Motors, that vehicle could be
based on none other than the GMC
Hummer EV pickup (www.sae.org/
news/2022/06/hummer-ev-drive), production
of which had just begun
months before.
Less than a year after that announcement,
GM Defense in June 2023 revealed
at the Modern Day Marine Expo in
Washington, D.C. its Electric Military
Concept Vehicle (eMCV). Featuring GM's
Ultium Platform, the EV propulsion architecture
satisfied the U.S. Army's requirement
for a light- to heavy-duty BEV
that helps to reduce fossil-fuel reliance in
operational and garrison environments.
" With access to GM's advanced technologies,
GM Defense is able to provide
proven commercial technologies
adapted to meet specific defense requirements
and the needs of our customers, "
said Steve duMont, president
of GM Defense, which leverages GM's
$35-billion investments in EV and autonomous-vehicle
technology. " This
demonstration will prove to our U.S.
Army customer...how the underlying
26 October 2023
technology can be leveraged for future
defense needs, whether on an installation
or in a tactical environment. "
The six-passenger eMCV uses the
production Hummer EV's chassis and
suspension system but with some modifications.
GM Defense added 37-inch
tires (compared to 35-inch for the roadgoing
model), a new heavy-duty brake
system and Fox performance shock absorbers.
Engineers reportedly also improved
upon the production truck's already-impressive
approach (49.7 deg.)
and departure (38.4 deg.) angles to further
enhance offroad performance.
ring, swing side-arm mounts and Silent
Watch and Silent Drive capabilities,
emitting low acoustic and thermal signatures.
The concept also offers exportable
power for mission-critical equipment.
An onboard 12-kW diesel-powered
generator provides limited battery
charging and propulsion.
As in the Hummer EV Edition 1 truck,
the eMCV's Ultium battery pack consists
of two layers of vertical cell modules,
combined to form a 200-plus
kWh, 24-module pack. Mounted low in
the center of the vehicle platform, the
pack's placement helps to keep the
center of gravity low and enables short
front and rear overhangs (34.7 inches/881
mm front, 46.5 inches/1,181 mm
rear for the production model).
The three-motor e4WD propulsion
system also is carried over from the
Edition 1 model. The dual-motor rear
drive unit features virtual locking capability;
there's a single motor and electronic
locking differential up front. The
resulting performance figures: 1,000 hp
(745 kW) and 11,500 lb-ft (15,591 Nm) of
wheel torque.
The eMCV is capable of 800-V DC fastcharging
up to 350 kW, enabling up to
nearly 100 miles (160 km) of driving
range in about 12 minutes. The military
vehicle offers 329 miles (529 km) of
combined driving range, according to GM
Defense, with 0-60 mph (0-97 km/h)
acceleration times as quick as 3 seconds.
The eMCV is a technology and concept development vehicle that will directly inform GM Defense's
ongoing series-hybrid Light Tactical Wheeled Vehicle development.
TRUCK & OFF-HIGHWAY ENGINEERING
BOTH IMAGES: GM DEFENSE

http://www.sae.org/news/2022/06/hummer-ev-drive

Truck & Off-Highway Engineering - October 2023

Table of Contents for the Digital Edition of Truck & Off-Highway Engineering - October 2023