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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 |
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Article number | 219 |
Number of pages | 10 |
Journal | Energies |
Volume | 12 |
Issue number | 2 |
DOIs | |
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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- 1 Finished
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Behavior of future electro-hydraulic systems in Arctic conditions
Minav, T.
01/09/2015 → 11/07/2019
Project: Academy of Finland: Other research funding