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Reduction of System Inherent Pressure Losses at Pressure Compensators of Hydraulic Load Sensing Systems
Jan Siebert, Karlsruher Institute of Technology, FAST, MOBIMA, Germany
Marcus Geimer, Karlsruher Institute of Technology, FAST, MOBIMA
In spite of their high technical maturity, load sensing systems (LS) have system-inherent energy losses that are largely due to the operation of parallel actuators with different loads at the same pressure level. Hereby, the pressure compensators of the system are crucial. So far, excessive hydraulic energy has been throttled at these compensators and been discharged as heat via the oil. The research project Reduction of System Inherent Pressure Losses at Pressure Compensators of Hydraulic Load Sensing Systems aims to investigate a novel solution of reducing such energy losses. The pressure of particular sections can be increased by means of a novel hydraulic circuit. Therefore, a recovery unit is connected in series with a hydraulic accumulator via a special valve in the reflux of the actuators. The artificially increased pressure level of the section reduces the amount of hydraulic power to be throttled at the pressure compensators. As long as a section fulfills the switching condition of the valve, pressure losses at the respective pressure compensator can be reduced. Thus, via a suitable recovery unit excessive energy can be regenerated and can be directed to other process steps eventually.