Truck & Off-Highway Engineering - June 2023 - 6

TECHNICAL INNOVATIONS
POWERTRAIN
AGCO goes clean
and green with
CORE75 engine
The fully integrated electric axle platform
is a clean-sheet design for medium- and
heavy-duty commercial vehicles.
New diesel ICE powertrains for on- and
off-highway applications have been rolling
out at a rapid pace over the past year.
Navistar recently launched its clean-sheet
S13 integrated powertrain for on-highway
use in the North American market (www.
sae.org/news/2022/10/navistars-groundup-approach-to-all-new-diesel-engine).
Caterpillar
also announced a new engine,
the C13D, for off-highway applications at
CONEXPO 2023 in Las Vegas (www.sae.
org/news/2023/03/cat-c13d-launch).
Another OEM to recently launch a
In-house-developed electric components for the new e-axle include the silicon-carbide inverter.
" In the initial [AxTrax] product we
had e-components which we bought
off-the-shelf from suppliers, like e-motors
and inverters, " Feldhaus shared
with Truck & Off-Highway Engineering.
" What we identified is that it's not able
to be the most efficient setup if we buy
components off-the-shelf. We identified
as a group both for passenger- and
commercial-vehicle applications that
we needed to develop those components
in-house to get the maximum
efficiency. That was the biggest lesson
learned for us on the first generation. "
Approximately seven years ago, ZF
decided to develop SiC inverter technology
and PSM (permanent synchronous
magnet) hairpin e-motor technology,
according to Feldhaus. " Together
with some of our partners, we developed
core technology like the silicon6
June 2023
carbide semiconductors [that are] extremely
important for the power efficiency
gains, " he said.
The modular design enables manufacturers
to use ZF's full e-powertrain
systems or " mix and match " their own
components. " Total cost of ownership
has been the main driver to come up
with this product development, " he
said. " For end users to apply electric
trucks in their fleets, we have to come
up with a solution for their business
case. So, efficiency has been in the
forefront. "
Production of AxTrax 2 is planned to
begin in Europe in late 2024 and in the
U.S. in 2025. Feldhaus could not yet share
OEM signoffs, " but this product will be
readily available in this market on many
OEM chassis, " he added.
Ryan Gehm
new powertrain is AGCO, which revealed
its new CORE75 off-highway
diesel engine in October 2022. The engine
made its debut in the Fendt 700
Vario Gen7 tractor and was billed as a
new design from the ground up. Truck &
Off-Highway Engineering sat down for
an interview with several AGCO representatives
at CONEXPO 2023 where the
company had the new engine on display,
to discuss the technical details of
the CORE75 as well as some of the design
principles that guided its creation.
Less revs, more power
The CORE75 is a turbocharged, inlinesix
cylinder, 7.5-liter (457 cubic-inch)
engine featuring a 110-mm (4.33-inch)
bore and a 132-mm (5.19-inch) stroke.
AGCO claims a peak output of 223 kW
(299 hp SAE net) at 1500-1700 rpm and
1450 Nm (1069 lb-ft) at 1200-1400 rpm.
The company claims that these figures
are a 12% improvement over the outgoing
engine, and the CORE75 reportedly
can operate over a wider speed range
of up to 2100 rpm.
The CORE75 was designed to offer
max torque at lower speeds compared
to the outgoing engine. This enabled
improved fuel economy (188 g/kWh) as
well as reduced NVH (noise, vibration
and harshness). " The lower engine
speed is actually one of the secret sauces
with this engine, " said Kelvin Bennett,
senior vice president engineering, AGCO
TRUCK & OFF-HIGHWAY ENGINEERING
BOTH IMAGES: ZF

http://www.sae.org/news/2022/10/navistars-ground-up-approach-to-all-new-diesel-engine http://www.sae.org/news/2023/03/cat-c13d-launch

Truck & Off-Highway Engineering - June 2023

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