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Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions

Author

Listed:
  • Tatiana Minav

    (School of Engineering, Department of Mechanical Engineering, Aalto University, P.O. Box 14400, 02150 Espoo, Finland)

  • Jani Heikkinen

    (Faculty of Industrial Automation and Electrical Engineering, Saint Petersburg Electrotechnical University ETU “LETI”, 197376 St. Petersburg, Russia)

  • Thomas Schimmel

    (Evonik Industries AG, Kirschenallee, 64293 Darmstadt, Germany)

  • Matti Pietola

    (School of Engineering, Department of Mechanical Engineering, Aalto University, P.O. Box 14400, 02150 Espoo, Finland)

Abstract

Direct driven hydraulic drives (DDH) have the advantages of compact high power density in hydraulic systems and flexible control of electric motors. These advantages can benefit non-road mobile machinery (NRMM) applications. However, maintaining high efficiency while working in sub-zero conditions with NRMM is challenging. Therefore, this paper investigates the effect of hydraulic oil on the efficiency of a DDH in a cold environment for an NRMM application. In the DDH setup, the speed and position control of a double-acting cylinder was implemented directly with an electric motor drive in a closed-loop system without the conventional control valves. Efficiency measurements of the DDH setup with two oils (conventional multi-grade and high-performance) were conducted under different operating conditions (speed and payload) and environmental conditions (temperature in °C). The paper provides an evaluation of the electro-hydraulic system and a discussion on the usage of hydraulic oil by non-road mobile working machines in sub-zero conditions. An experimental investigation demonstrated an improvement in efficiency of 5%-unit at 22 °C, from 2%-unit to 5%-unit at 3 °C, and of almost a 10%-unit at temperatures below zero (−10 °C) by changing oil.

Suggested Citation

  • Tatiana Minav & Jani Heikkinen & Thomas Schimmel & Matti Pietola, 2019. "Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions," Energies, MDPI, vol. 12(2), pages 1-10, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:2:p:219-:d:196858
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    References listed on IDEAS

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    1. Paolo Casoli & Luca Riccò & Federico Campanini & Andrea Bedotti, 2016. "Hydraulic Hybrid Excavator—Mathematical Model Validation and Energy Analysis," Energies, MDPI, vol. 9(12), pages 1-19, November.
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    Cited by:

    1. Wang, He & Chen, Zhen & Huang, Jiahai, 2021. "Improvement of vibration frequency and energy efficiency in the uniaxial electro-hydraulic shaking tables for sinusoidal vibration waveform," Energy, Elsevier, vol. 218(C).
    2. Juraj Benić & Juraj Karlušić & Željko Šitum & Mihael Cipek & Danijel Pavković, 2022. "Direct Driven Hydraulic System for Skidders," Energies, MDPI, vol. 15(7), pages 1-13, March.
    3. Hyukjoon Kwon & Monika Ivantysynova, 2020. "System Characteristics Analysis for Energy Management of Power-Split Hydraulic Hybrids," Energies, MDPI, vol. 13(7), pages 1-23, April.
    4. 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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