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

Tatiana Minav; Jani Heikkinen; Thomas Schimmel; Matti Pietola

doi:10.3390/en12020219

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

Tatiana Minav, Jani Heikkinen, Thomas Schimmel, Matti Pietola

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

101 Downloads (Pure)

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

Original language	English
Article number	219
Number of pages	10
Journal	Energies
Volume	12
Issue number	2
DOIs	https://doi.org/10.3390/en12020219
Publication status	Published - 11 Jan 2019
MoE publication type	A1 Journal article-refereed

Keywords

hydraulic actuator
hydraulic drives
electric drives
efficiency
losses
zonal hydraulics
direct driven hydraulics
non-road mobile working machines
low temperature
high-performance oil
Hydraulic drives
Zonal hydraulics
Hydraulic actuator
Direct driven hydraulics
Losses
Electric drives
Efficiency
High-performance oil
Non-road mobile working machines
Low temperature

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energies-12-00219Final published version, 2.76 MBLicence: CC BY

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Minav, T., Heikkinen, J., Schimmel, T., & Pietola, M. (2019). Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions. Energies, 12(2), [219]. https://doi.org/10.3390/en12020219

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title = "Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions",

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",

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