Experimental evaluation of a digital hydraulic power management system
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|Otsikko||Proceedings of the Third Workshop on Digital Fluid Power, October 13-14 2010, Tampere, Finland|
|Toimittajat||Arto Laamanen, Matti Linjama|
|Tila||Julkaistu - 2010|
|OKM-julkaisutyyppi||A4 Artikkeli konferenssijulkaisussa|
The digital hydraulic power management system is a new energy-efficient alternative to the fluid power system. Based on digital (stroke to stroke) control of each piston of the pumping unit, its functionality consisted of (1) an arbitrary number of independent outlets, (2) service of each outlet at arbitrary pressure levels, (3) energy recovery from each outlet back to the prime mover, (4) power transfer from one outlet to another at arbitrary pressure levels, and (5) energy storage in and recovery from a hydraulic accumulator independent of pressure. Theoretical analysis and simulations show that the principle works and is highly efficient. This paper reports experimental results on the principle. The prototype power management system consisted of a six-piston boxer pump, fast on/off control valves, and two independent outlets. The system was measured for its efficiency, controllability and energy transformation functionality. The results are encouraging but show also that more pistons are needed for smooth flow rates. In addition, control methods need to be further developed for more accurate pressure control.