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Energies 2017, 10(7), 941;

Efficiency Improved Load Sensing System—Reduction of System Inherent Pressure Losses

Institute of Mobile Machines (Mobima), Karlsruhe Institute of Technology (KIT), Rintheimer Querallee 2, 76131 Karlsruhe, Germany
Author to whom correspondence should be addressed.
Academic Editor: Andrea Vacca
Received: 24 March 2017 / Revised: 20 June 2017 / Accepted: 28 June 2017 / Published: 7 July 2017
(This article belongs to the Special Issue Energy Efficiency and Controllability of Fluid Power Systems)
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Although more efficient than e.g., constant flow systems, hydraulic load sensing (LS) systems still have various losses, e.g., system inherent pressure losses (SIPL) due to throttling at pressure compensators. SIPL always occur whenever two or more actuators are in operation simultaneously at different pressure levels. This paper introduces a novel hydraulic LS system architecture with reduced SIPL. In the new circuit, each actuator section is automatically connected either to the tank or to a hydraulic accumulator in dependence of its individual and the systems load situation via an additional valve. When connected to the accumulator, the additional pressure potential in the return line increases the load on the actuator and thus reduces the pressure difference to be throttled at the pressure compensator. The new circuit was developed and analyzed in simulation. For this, the hydraulic simulation model of a hydraulic excavator was used. To validate the sub-models of both machine and new circuit, two separate test rigs were developed and used. Both valid sub-models then were combined to the model of the optimized system. The final simulation results showed, that under the applied conditions, the novel hydraulic circuit was able to decrease SIPL of the examined system by approximately 44% and thus increasing the machines’ total energy efficiency. With the successful completion of the project, the gathered knowledge will be used to further develop the proposed circuit and its components. View Full-Text
Keywords: efficiency improvement; load sensing system; system inherent pressure losses efficiency improvement; load sensing system; system inherent pressure losses

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Siebert, J.; Wydra, M.; Geimer, M. Efficiency Improved Load Sensing System—Reduction of System Inherent Pressure Losses. Energies 2017, 10, 941.

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