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.

Downloads

Download data is not yet available.

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

L. Viktor Larsson, Robert Lejonberg, and Liselott Ericson. Control Optimisation of a Pump-Controlled Hydraulic System using Digital Displacement Pumps. In The 17th Scandinavian Conference on Fluid Power (SICFP’21), 2021. URL: https://ecp.ep.liu.se/index.php/sicfp/article/view/35, last visited on: 2021-08-18.

Søren Ketelsen, Damiano Padovani, Torben O. Andersen, Morten Kjeld Ebbesen, and Lasse Schmidt. Classification and review of pump-controlled differential cylinder drives. Energies, 12(7), 2019. URL: https://doi.org/10.3390/en12071293, last visited on: 2021-08-18.

Kim Heybroek. On Energy Efficient Mobile Hydraulic Systems: with Focus on Linear Actuation. PhD thesis, Linköping University, 2017. URL: https://doi.org/10.3384/diss.diva-142326, last visited on: 2021-08-18.

Danfoss Power Solutions. Digital Displacement Pump, User Guide https://assets.danfoss.com/documents/184429/BC306384089197en-000201.pdf. Last visited on: 2021-08-18, 2019.

Epiroc. Scooptram ST14 Battery http://www.podshop.se/Epiroc/epiroc/Products/DownloadLowres/?productRef=83685. Last visited on: 2021-08-18, 2019.

Niall Caldwell. Review of Early Work on Digital Displacement® Hydrostatic Transmission Systems. volume BATH/ASME 2018 Symposium on Fluid Power and Motion Control of Fluid Power Systems Technology, 09 2018. URL: https://doi.org/10.1115/FPMC2018-8922, last visited on: 2021-08-18.

Matthew Green, Jill Macpherson, Niall Caldwell, and W. H. S. Rampen. DEXTER: The Application of a Digital Displacement® Pump to a 16 Tonne Excavator. volume BATH/ASME 2018 Symposium on Fluid Power and Motion Control of Fluid Power Systems Technology, 09 2018. URL: https://doi.org/10.1115/FPMC2018-8894, last visited on: 2021-08-18.

Matteo Pellegri, Matthew Green, Jill Macpherson, Callan McKay, and Niall Caldwell. Applying a Multi-Service Digital Displacement ® Pump to an Excavator to Reduce Valve Losses. In 12th International Fluid Power Conference (IFK’20), Dresden, Germany, 2020. URL: https://doi.org/10.25368/2020.70, last visited on: 2021-08-18.

Samuel Kärnell, Amy Rankka, Alessandro Dell’Amico, and Liselott Ericson. Digital Pumps in Speed-Controlled Systems - An Energy Study for a Loader Crane Application. In 12th International Fluid Power Conference (IFK’20), Dresden, Germany, 2020. URL: https://doi.org/10.25368/2020.71, last visited on: 2021-08-18.

Michael Sprengel and Monika Ivantysynova. Neural network based power management of hydraulic hybrid vehicles. International Journal of Fluid Power, 18(2):79–91, 2017. URL: https://doi.org/10.1080/14399776.2016.1232117, last visited on: 2021-08-18.

Hosam K. Fathy, Julie A. Reyer, Panos Y. Papalambros, and A. Galip Ulsoy. On the coupling between the plant and controller optimization problems. volume Proceedings of the American Control Conference, 06 2001. URL: https://doi.org/10.1109/ACC.2001.946008, last visited on: 2021-08-18.

Karl Uebel, Henrique Raduenz, Petter Krus, and Victor de Negri. Design Optimisation Strategies for a Hydraulic Hybrid Wheel Loader. In BATH/ASME 2018 Symposium on Fluid Power and Motion Control, 2018. URL: https://doi.org/10.1115/FPMC2018-8802, last visited on: 2021-08-18.

Petter Krus and Johan Andersson. Optimizing Optimization for Design Optimization. In In ASME Design Engineering Technical Conferences and Computers and Information in Engineering Conference, pages 951–960, 09 2003. URL: https://doi.org/10.1115/DETC2003/DAC-48803, last visited on: 2021-08-18.

Olle Sundstrom and Lino Guzzella. A generic dynamic programming Matlab function. In 2009 IEEE Control Applications, (CCA) Intelligent Control, (ISIC), pages 1625–1630, 2009. URL: https://doi.org/10.1109/CCA.2009.5281131, last visited on: 2021-08-18.

Downloads

Published

2021-11-20

How to Cite

Larsson, L. V., Lejonberg, R., & Ericson, L. (2021). Optimisation of a Pump-Controlled Hydraulic System using Digital Displacement Pumps. International Journal of Fluid Power, 23(1), 53–78. https://doi.org/10.13052/ijfp1439-9776.2313

Issue

Section

SICFP 2021