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@PHDTHESIS{Leifeld:843267,
author = {Leifeld, Roland},
othercontributors = {Murrenhoff, Hubertus and Schmitz, Katharina},
title = {{H}ybridmodul für elektrohydraulische {A}ntriebssysteme
von {B}aggern},
volume = {111},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Düren},
publisher = {Shaker Verlag},
reportid = {RWTH-2022-03002},
isbn = {978-3-8440-8541-9},
series = {Reihe Fluidtechnik. D},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2022},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, RWTH Aachen University, 2022},
abstract = {To this day, mobile machines largely consist of drive
systems that are primarily powered by a diesel engine. A
large proportion of the mechanical power available at the
engine shaft is usually converted into hydraulic power by
hydrostatic pumps. The advantages of hydraulics as a robust
and compact drive technology for operating many parallel,
primarily linear, actuators will continue to lead to its use
in mobile machinery in the future. For a long time,
increasing machine efficiency or productivity was based on
improving individual drive subsystems. However, a holistic
view of the mobile machine, which considers the interaction
of all subsystems in the machine as well as the external
influences on the machine, is promising. With respect to the
interaction between subsystems, the primary goal is to shift
the load collective of each subsystem to its optimal
operating point. The focus of this work is the development
of a hydraulic hybrid system, which is to be understood as
an additional module supplementing the regular valve system
of a hydraulic excavator. In addition to a purely static
power balancing, this system also includes the limitation of
dynamic torque changes on the diesel engine. Transient load
conditions of the ICE in particular are responsible for an
increase in both fuel consumption and engine emissions. The
hydraulic hybrid system developed, which is used as a
supplement to a ICE, is thus able to prevent abrupt torque
loads on the ICE through dynamic support. The static power
balancing of the ICE consists of actively charging the
storage in phases with power surplus, which corresponds to
an increase of the base load, and being supported by the
storage of the hybrid system in phases with power shortage.
In the form of volume flow support, the hybrid system
together with the main pump provides the required power for
the electrohydraulic LS system. The hybrid system is
compared with the standard/LS system based on three load
cycles, whereby the measurements were carried out in each
case with the same machine, on the same day, with the same
machine operator, in order to ensure a high degree of
comparability of the measurement results. On average of all
cycles, a fuel saving of approx. 16 $\%$ and a reduction in
cycle time of approx. 4 $\%$ is determined with the hybrid
system.},
cin = {412810},
ddc = {620},
cid = {$I:(DE-82)412810_20180620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2022-03002},
url = {https://publications.rwth-aachen.de/record/843267},
}
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