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Energy Management of Low-Pressure Systems Utilizing Pump-Unloading Valve and Accumulator

School of Mechanical Engineering, Purdue University, 610 Purdue Mall, West Lafayette, IN 47907, USA
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Energies 2019, 12(23), 4423; https://doi.org/10.3390/en12234423
Received: 31 October 2019 / Revised: 17 November 2019 / Accepted: 18 November 2019 / Published: 21 November 2019
In the context of improving energy efficiency and fuel consumption of mobile hydraulic equipment, it is important to analyze all the sources of power loss occurring within the hydraulic systems. While plenty of analyses have been performed on the working implements and the main transmission systems, very little attention has been paid to low-pressure (LP) systems until recently. LP systems are required on closed-circuit hydraulic systems to replenish losses, provide cooling flow, and maintain a pilot pressure necessary to operate hydraulic control valves and variable displacement units. It is shown that these circuits, which are often thought to have minimal impact on power consumption, actually cause significant, continuous power loss. A new method of power savings in these circuits is investigated through management of charge pump flow by application of an accumulator-sense pump-unloading (ASPU) valve. This work further proposes the combination of a split LP architecture with an ASPU valve. Three systems are simulated using Simcenter Amesim® and MATLAB/Simulink®. Using realistic duty cycles and unit loss models on a circuit for mobile off-road hydraulic equipment, it is shown that a standard LP system can consume about 5 kW of power. Power savings of up to 65% over a standard LP system are demonstrated by the proposed architecture. View Full-Text
Keywords: low pressure system; accumulator; unloading valve; energy efficiency; charge pump; fluid power; power loss; hydraulics low pressure system; accumulator; unloading valve; energy efficiency; charge pump; fluid power; power loss; hydraulics
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Stump, P.M.; Keller, N.; Vacca, A. Energy Management of Low-Pressure Systems Utilizing Pump-Unloading Valve and Accumulator. Energies 2019, 12, 4423.

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