A high-efficient solution for electro-hydraulic actuators with energy regeneration capability

Qu, Shaoyang; Fassbender, David; Vacca, Andrea; Busquets, Enrique

doi:10.1016/j.energy.2020.119291

Cited by 52 publications

(34 citation statements)

References 20 publications

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“…• The novel concept is designed as an open circuit. Open circuit pumps show higher efficiencies than those for closed circuits [18], pump or motor leakages are easier to handle and oil cooling as well as filtering is more convenient, especially for a single centralized reservoir such as present in the novel concept. Open-circuit pump-controlled actuators exist as well, but issues with tilting loads and mode switching during movement were reported [13,19], which does not apply for the EGHM concept.…”

Section: Advantages Towards Electro-hydraulic-actuator Conceptsmentioning

confidence: 99%

Improving the Energy Efficiency of Single Actuators with High Energy Consumption

Fassbender¹,

Minav²,

Brach³

et al. 2021

Linköping Electronic Conference Proceedings

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A load sensing (LS) supply in combination with control valves is one of the most common solutions for the actuation of implements on heavy-duty mobile machines (HDMMs). A major drawback of this approach is its relatively low energy efficiency due to metering losses—especially for multi-actuator operation and load braking. Several novel, more efficient concepts have already been proposed but involve high component costs for each actuator, which is not acceptable for HDMMs with many actuators that have a medium to low energy turnover. Therefore, this work proposes a novel system design which is based on a conventional LS system—for cheap operation of a high number of low-energy-consuming actuators—but allows to avoid metering losses for single high-energy-consuming actuators by replacing their metering valves with electric-generator-hydraulic-motor (EGHM) units that work similar to pump-controlled concepts. The benefits of the novel concept are explained in detail by looking at the three main throttling functions of an actuator in a typical valve-controlled LS systems, which the novel concept avoids by applying pressure in the actuator return lines and recuperating energy electrically instead of dissipating it by throttling. Furthermore, advantages and challenges for the novel concept are analyzed, and ways to address the latter are presented. Before the novel concept is simulated, the required control algorithms are presented. The simulation study in Amesim and Simulink focuses on a telehandler that utilizes the novel concept for the boom, extension and tilt actuators. Simulation results show that the novel system can decrease the required input energy for typical duty cycles by up to 34% compared to a conventional LS system. At the same time, simulations show that, from an economic perspective, it seems most reasonable to utilize the novel EGHM units only for the boom and extension actuators of the studied telehandler.

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Section: Advantages Towards Electro-hydraulic-actuator Conceptsmentioning

confidence: 99%

Improving the Energy Efficiency of Single Actuators with High Energy Consumption

Fassbender¹,

Minav²,

Brach³

et al. 2021

Linköping Electronic Conference Proceedings

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“…More recent studies on open circuits have been presented by Qu et al [38,39]. Their system is based on a speed-controlled gear machine.…”

Section: Open Circuitsmentioning

confidence: 99%

Hysteresis Control in Pump-Controlled Systems—A Way to Reduce Mode-Switch Oscillations in Closed and Open Circuits

Kärnell¹,

Ericson²

2022

Energies

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There is growing interest in using electric motors as prime movers in mobile hydraulic systems. This increases the interest in so-called pump-controlled systems, where each actuator has its own drive unit. Such architectures are primarily appealing in applications where energy efficiency is important and electric recuperation is relevant. An issue with pump-controlled systems is, however, mode-switch oscillations which can appear when the pressure levels in the system are close to the switching condition. In this paper, the mode-switching behavior of different generalized closed and open circuit configurations is investigated. The results show that the choice of where to sense the pressures has a huge impact on the behavior. They also show that, if the pressure sensing components are properly placed, closed and open circuits can perform very similarly, but that mode-switch oscillations still can occur in all circuits. Active hysteresis control is suggested as a solution and its effectiveness is analyzed. The outcome from the analysis shows that active hysteresis control can reduce the risk for mode-switch oscillations significantly.

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“…Double counterbalance valves are used on the knuckle cylinder, and throttle the flow to assist in load holding and load lowering. The unitless openings of the counterbalance valves are calculated in Equations ( 23) and (24).…”

Section: Conflicts Of Interestmentioning

confidence: 99%

“…A study of a differential cylinder connected to two pumps is conducted in [18], studying the effect of pump displacement ratio and cylinder area ratio on energy recovery. Other topics of pump-controlled cylinders and EHAs include: load-holding topolgies [19,20], analysis of EHAs [21][22][23], energy regeneration in EHAs [24], optimization of EHAs [25], and EHAs for more-electric aircraft [26].…”

Section: Introductionmentioning

confidence: 99%

Novel Concept for Electro-Hydrostatic Actuators for Motion Control of Hydraulic Manipulators

2021

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Self-contained hydraulic cylinders have gained popularity in the recent years but have not been implemented for high power articulated hydraulic manipulators. This paper presents a novel concept for an electro-hydrostatic actuator applicable to large hydraulic manipulators. The actuator is designed and analyzed to comply with requirements such as load holding, overload handling, and differential flow compensation. The system is analyzed during four quadrant operation to investigate energy efficiency and regenerative capabilities. Numerical simulation is carried out using path control and 2DOF anti-swing of a hydraulic crane as a load case to illustrate a real world scenario. A comparison with traditional valve-controlled actuators is conducted, showing significantly improved efficiency and with similar dynamic response, as well as the possibility for regenerating energy.

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A high-efficient solution for electro-hydraulic actuators with energy regeneration capability

Cited by 52 publications

References 20 publications

Improving the Energy Efficiency of Single Actuators with High Energy Consumption

Improving the Energy Efficiency of Single Actuators with High Energy Consumption

Hysteresis Control in Pump-Controlled Systems—A Way to Reduce Mode-Switch Oscillations in Closed and Open Circuits

Novel Concept for Electro-Hydrostatic Actuators for Motion Control of Hydraulic Manipulators

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