Truck & Off-Highway Engineering - October 2024 - 22

Off-highway
hybrids are entering
PRIME TIME
Cost and batterypackaging
constraints
prevent John Deere
from fully electrifying
the 944 X-Tier wheel
loader used for a
variety of quarry
applications.
The 944 and 644 X-Tier
electric-drive vehicles
have accumulated more
than three million customer
hours. Additional
X-Tier loader models, the
744 and 824, launched
earlier this year. The 850
X-Tier dozer is next for
market deployment.
" We've learned a lot, and
we're applying that
knowledge to future electric-drive
models and our
battery-electric projects, "
Van Tine said.
Hybrid technology is a
Grant Van Tine said John
Deere's experience with
electric-drive wheel loaders
goes back to 2013 with the
debut of the 644 X-Tier
model. The company now has
four X-Tier hybrid loaders.
powerful emissions-reduction resource. In a fuel emissions
comparison of vehicles powered by one of three
sources - diesel-electric, diesel-electric with renewable
fuel, or battery-electric - each provided a double-digit
percentage carbon emission savings versus a conventional
diesel engine.
In a 2,500-hour usage example, an engine using
renewable fuel (R100) provided a carbon emissions
reduction estimate of 74% when compared to a conventional
diesel engine. John Deere's calculated values
are based on machine telematics data and Argonne
National Laboratory's GREET (Greenhouse gases,
Regulated Emissions and Energy use in Technologies)
model for fuel emissions factors.
" From John Deere's perspective, we don't see a single
solution that will win out and work in every single
22 October 2024
Eaton's P2/P3 hybrid transmission concept provides a 20-30% reduction in carbon
emissions and a higher level of performance compared to a conventional transmission.
application, " Van Tine said, underscoring the relevance of combustion
engines running renewable fuels, hybrid and all-electric technologies
for off-highway vehicles. " We continue to invest in ICE technology,
looking at solutions from both a compression ignition and spark ignition
standpoint, to enable a variety of renewable fuels for the future, "
Van Tine said.
'Novel' hybrid transmission
Looking back several years, hybrid technologies were essentially stalled
out. " For vocational vehicles, hybridization makes sense today based on
a combination of fuel savings and added performance, and this situation
TRUCK & OFF-HIGHWAY ENGINEERING
CLOCKWISE FROM TOP LEFT: JOHN DEERE; EATON; SAE/RYAN GEHM
Truck & Off-Highway Engineering - October 2024

Table of Contents for the Digital Edition of Truck & Off-Highway Engineering - October 2024
