Truck & Off-Highway Engineering - April 2023 - 9

TECHNICAL INNOVATIONS
Dextreme Swap
realizes a significant
reduction in losses from
ancillaries by allowing
for aggressive engine
down-speeding without
stalling the engine.
At the core of all the Dextreme systems is
Danfoss' Digital Displacement pump, which
replaces the machine's main hydraulic pump.
and allowing for energy recovery and
reuse, " he said.
According to Danfoss calculations,
sizes. Each system provides an incremental
step in benefits, Bruhn explained
to Truck & Off-Highway Engineering.
" At the core of all the Dextreme systems
is our Digital Displacement pump. In
the Dextreme Swap system, we achieve
significant savings by reducing the engine
speed, dramatically cutting its parasitic
losses without sacrificing productivity.
Due to the fast control response of our
pump, we can run the engine at maximum
load without risk of stalling, " Bruhn said.
" In the Dextreme Flex system, dynamic
allocation of pump displacement
to services prevents high-loss situations
from occurring in the main control valve
through throttling, " he added. " The
Dextreme Max system takes this even
further by recovering energy from some
of the excavator's motions, such as slew
deceleration or boom down. Controlling
hydraulic loads directly from the Digital
Displacement pump also cuts throttling
losses in the main control valve. "
Electrified systems benefit, too
Dextreme can be integrated into diesel,
hybrid and fully-electric excavators and
TRUCK & OFF-HIGHWAY ENGINEERING
will work with any machine control system.
" These systems allow OEMs to
take action now and start the journey of
making significant energy and CO2
savings,
which is why we are mainly focusing
on applying Dextreme to dieselpowered
excavators, " Bruhn said.
" Energy savings are highest on dieselpowered
machines as they inherently
have higher-loss ancillaries driven by
the engine. "
The benefits are slightly different for
electrified systems as they don't benefit
from reducing the engine speed and
associated ancillaries, Bruhn added.
" Our studies have shown that we can
make significant improvements in making
the battery smaller or improving the
runtime of electrified machines - both
of which significantly improve the impact
of these machines. "
" On electric machines, the prime
mover is inherently much more efficient.
However, we would still show significant
efficiency and control improvements
with our Dextreme Flex and Max
systems as more of those systems' benefits
are in reducing control-valve losses
an excavator utilizing the Dextreme
system will have a lower total cost of
ownership than a standard diesel machine.
" We tend to focus on the impact
on the fuel efficiency the end user gets
where we can reduce hourly fuel consumption
of something like 13 L/hr
down to around 11 L/hr with Swap and
all the way to 6.5 L/hr when we offer
the Dextreme Max system, " Bruhn
said. " With global fuel costs where
they are, this directly impacts the running
costs that operators face. "
For owners more interested in reducing
cycle times than fuel consumption,
Dextreme Swap reportedly can
deliver up to 25% higher productivity.
Its integral digital pump controller provides
extensive data, offering fleet operators
real-time performance monitoring
and diagnostics.
Danfoss is in the demonstration
phase with several customers globally
and have an ongoing multi-machine
field trial in the U.K. Dextreme systems
will be available globally through the
Danfoss Power Solutions network.
Ryan Gehm
April 2023 9
BOTH IMAGES: DANFOSS
Truck & Off-Highway Engineering - April 2023

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