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Digital hydraulics offers advantages over traditional proportional valves but lacks high flow rate performance. This study proposes a solution based on operated on/off valves. The proposed system achieved a flow rate of nearly 350 LPM at nominal operating pressure with a roughly 25 ms fast response time. A novel dual flow solution is also presented and analyzed. These breakthroughs demonstrate the innovative feasibility of implementing pilot-operated, stroke-limited on/off valves in digital hydraulics. The results show that more possible discrete flow rates were achievable using the dual discrete flow method. In conclusion, the grouping of these valves and digital control approach enhances fluid power systems resolution, opening new possibilities for wider adoption, and improved performance in digital hydraulic systems.
Elsaed et al. (Sun,) studied this question.