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

Tatiana Minav, Jani Heikkinen, Thomas Schimmel and Matti Pietola
Additional contact information
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

Energies, 2019, vol. 12, issue 2, 1-10

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.

Keywords: hydraulic actuator; hydraulic drives; electric drives; efficiency; losses; zonal hydraulics; direct driven hydraulics; non-road mobile working machines; low temperature; high-performance oil (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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