Optimisation of a Pump-Controlled Hydraulic System using Digital Displacement Pumps

Authors

  • L. Viktor Larsson Division of Fluid and Mechatronic Systems (Flumes), Department of Management and Engineering (IEI), Linköping University, Linköping, Sweden https://orcid.org/0000-0002-4400-2062
  • Robert Lejonberg Epiroc Rock Drills AB, Örebro, Sweden
  • Liselott Ericson Division of Fluid and Mechatronic Systems (Flumes), Department of Management and Engineering (IEI), Linköping University, Linköping, Sweden

DOI:

https://doi.org/10.13052/ijfp1439-9776.2313

Keywords:

Control Optimisation, Simulation-Based Optimisation, Pump Control, Digital Displacement Pump, Mobile Hydraulics

Abstract

When electrifying working machines, energy-efficient operation is key to maximise the use of the limited capacity of on-board batteries. Previous research indicate high energy savings by means of component and system design. In contrast, this paper focuses on how to maximise energy efficiency by means of both design and control optimisation. Simulation-based optimisation and dynamic programming are used to find the optimal electric motor speed trajectory and component sizes for a scooptram machine equipped with pump control, enabled by digital displacement pumps with dynamic flow sharing. The results show that a hardware configuration and control strategy that enable low pump speed minimise drag losses from parasitic components, partly facilitated by the relatively high and operation point-independent efficiencies of the pumps and electric motor. 5–10% cycle energy reductions are indicated, where the higher figure was obtained for simultaneous design and control optimisation. For other, more hydraulic-intense applications, such as excavators, greater reductions could be expected.

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Author Biographies

L. Viktor Larsson, Division of Fluid and Mechatronic Systems (Flumes), Department of Management and Engineering (IEI), Linköping University, Linköping, Sweden

L. Viktor Larsson recieved a Ph.D. in hydraulics at Linköping University in 2019. He currently works as a postdoctoral researcher at Linköping University, with optimisation of electrohydraulic systems for working machines as primary research topic.

Robert Lejonberg, Epiroc Rock Drills AB, Örebro, Sweden

Robert Lejonberg received a M.Sc. in hydraulics at Linköping University in 2008. He has worked in various Norwegian offshore projects with hydraulics and control design. Currently Robert is working at Epiroc Rock Drills AB as an R&D engineer developing battery electric loaders and mine trucks.

Liselott Ericson, Division of Fluid and Mechatronic Systems (Flumes), Department of Management and Engineering (IEI), Linköping University, Linköping, Sweden

Liselott Ericson received a Ph.D in hydraulics at Linköping University (LiU), Sweden, in 2012. She currently works as an associate professor at Fluid and Mechatronic Systems at LiU. The areas of interest include pump and motor design, electro-hydraulic systems, modelling and simulation.

References

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Published

2021-11-20

Issue

Section

SICFP 2021