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A Class of Energy Efficient Self-Contained Electro-Hydraulic Drives with Self-Locking Capability

Author

Listed:
  • Lasse Schmidt

    (Department of Energy Technology, Aalborg University, Pontoppidanstraede 111, 9220 Aalborg, Denmark)

  • Søren Ketelsen

    (Department of Energy Technology, Aalborg University, Pontoppidanstraede 111, 9220 Aalborg, Denmark)

  • Morten Helms Brask

    (Bosch Rexroth A/S, Gungevej 1, 2650 Hvidovre, Denmark)

  • Kasper Aastrup Mortensen

    (Bosch Rexroth A/S, Gungevej 1, 2650 Hvidovre, Denmark)

Abstract

Pump controlled and self-contained electro-hydraulic cylinder drives may improve energy efficiency and reduce installation space compared to conventional valve solutions, while being in line with the trend of electrification. The topic has gained increasing interest in industry as well as in academia in recent years. However, this technology has failed to break through in industry on a broad scale, with the reason assumed to be lack of meeting industry requirements. These requirements include high drive stiffness enabling a large application range, and the ability to maintain cooling and filtration in required ranges, enabling proper reliability and durability. Furthermore, at this point the cost of realization of such drives is comparable only to high end valve drive solutions, while not providing dynamics on a similar level. An initiative to improve this technology in terms of a class of drives evolving around a hydraulic cylinder locking mechanism is proposed. The resulting class of drives generally rely on separate cylinder forward and return flow paths, allowing for fluid cooling and filtration as well as control of the drive stiffness. The proposed class of drives is analyzed regarding energy loss and recovery potential, a basic model based control design is realized, and the industrial feasibility of the drive class is considered. It is found that the proposed class of drives may be realized with standard components maintained in their design ranges at competitive costs compared to conventional valve solutions. Furthermore, it is found that pressure levels may be controlled in a proper way, allowing to produce either highly efficient operation or a high drive stiffness.

Suggested Citation

  • Lasse Schmidt & Søren Ketelsen & Morten Helms Brask & Kasper Aastrup Mortensen, 2019. "A Class of Energy Efficient Self-Contained Electro-Hydraulic Drives with Self-Locking Capability," Energies, MDPI, vol. 12(10), pages 1-26, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:10:p:1866-:d:231657
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    References listed on IDEAS

    as
    1. Damiano Padovani & Søren Ketelsen & Daniel Hagen & Lasse Schmidt, 2019. "A Self-Contained Electro-Hydraulic Cylinder with Passive Load-Holding Capability," Energies, MDPI, vol. 12(2), pages 1-21, January.
    2. Søren Ketelsen & Damiano Padovani & Torben O. Andersen & Morten Kjeld Ebbesen & Lasse Schmidt, 2019. "Classification and Review of Pump-Controlled Differential Cylinder Drives," Energies, MDPI, vol. 12(7), pages 1-27, April.
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    Cited by:

    1. Lukasz Stawinski & Justyna Skowronska & Andrzej Kosucki, 2021. "Energy Efficiency and Limitations of the Methods of Controlling the Hydraulic Cylinder Piston Rod under Various Load Conditions," Energies, MDPI, vol. 14(23), pages 1-20, November.
    2. Paolo Casoli & Fabio Scolari & Carlo Maria Vescovini & Massimo Rundo, 2022. "Energy Comparison between a Load Sensing System and Electro-Hydraulic Solutions Applied to a 9-Ton Excavator," Energies, MDPI, vol. 15(7), pages 1-15, April.
    3. Lasse Schmidt & Kenneth Vorbøl Hansen, 2022. "Electro-Hydraulic Variable-Speed Drive Networks—Idea, Perspectives, and Energy Saving Potentials," Energies, MDPI, vol. 15(3), pages 1-33, February.
    4. Søren Ketelsen & Sebastian Michel & Torben O. Andersen & Morten Kjeld Ebbesen & Jürgen Weber & Lasse Schmidt, 2021. "Thermo-Hydraulic Modelling and Experimental Validation of an Electro-Hydraulic Compact Drive," Energies, MDPI, vol. 14(9), pages 1-29, April.

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