New drive – Curtain up for the technology of the future - DEUTZ Home

Photos: Bomag
Customers from the construction machinery
branch require above all that the power units
of their equipment can cope with the highest
of demands and can demonstrate above average
capability and reliability. In addition, the
power units must be energy-efficient, low on
fuel consumption and environmentally friendly
by complying with the stricter emissions regulations.
Too much to ask? Not for DEUTZ. At
bauma 2010, Bomag presents a roller prototype
whose DEUTZ hybrid drive meets every
one of these requirements.
Global demands for CO 2 reductions
are leading to an increasingly
growing discussion on alternative
power drive designs.
Hybrids in the passenger vehicle
segment have been around for
years but remain the exception
for mobile machinery. Already
in 2007 DEUTZ was pioneering
the development of a hybrid
drive for a wheel loader for the
Atlas Weyhausen company. This
was a sensation for non-road
applications. The AR 60 wheel
loader has meanwhile found a
successor that is on the way to
being series-produced with the
DEUTZ hybrid drive (DEUTZ LIVE
reports).
The DEUTZ hybrid drive is also
highly suited to other construction
machinery. The compacting
of asphalt is ideal for utilizing
hybrid technology. Compacting
is characterised by a roller’s
nonstop reversing manoeuvres:
braking, direction change and
then a short burst of acceleration.
On top of this, the compacting
process requires an on
and off activation of a generator
system, which requires still more
power.
DEUTZ again takes a pioneering
role in collaboration with its partners.
At bauma 2010, Bomag,
the global leader in compacting
technology as well as a manufacturer
for earth, asphalt and
waste compacting equipment,
presents its original field tested
“hybrid roller” based on BW 174
AP AM, the most successful
Bomag roller with a market share
of more than 50 percent.
This “hybrid roller” uses a 47
kW TD2009 DEUTZ combustion
engine and a DEUTZ hybrid system
made up of an e-machine, a
high-performance battery, along
with powerful electronics and a
maximum usable 22kW of electric
power. The hybrid system’s
e-machine is integrated into the
combustion engine’s flywheel
housing thereby saving space.
Expertise
The electronics and battery are
easily accessible by being located
in the roller’s door.
The operating principles of the
DEUTZ hybrid system are both
simple and efficient. The electric
motor takes energy from the
battery and assists the main
power unit as required, e.g.
when switching to vibration or
during acceleration. This then
covers the peaks of when performance
is needed. The concept
enables a significantly reduced
nominal performance level from
the diesel engine, i.e. downsizing,
meaning no need for complex
exhaust gas aftertreatment
systems. During low engine-load
phases, e.g. during braking or
vibration system deactivation,
the e-machine functions as a
generator and recharges the battery.
Mechanical kinetic energy
can then be recuperated. During
optimal work phases the diesel
engine always operates at its
most efficient. A further feature
of the system is its automatic
start/stop function. When running
idle, and when consumers
are shut down, the diesel engine
automatically switches off.
Movement of the drive lever, or
the activation of a consumer,
switches on the diesel engine
via the e-machine. This takes
place without any delay so that
the operator can begin work immediately.
This significantly reduces overall
fuel consumption and the associated
emissions of CO2. Initial
tests have been very promising
with diesel savings of up to thirty
percent.
The tested prototype can be
seen at bauma 2010. Advanced
compacting engineering coupled
with frontline engine technology -
making the BW174 AP hybrid into
a 21st century roller. $
15