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US 11,442,478 B2Granted
Pressure control device
AssigneeHydac Fluidtechnik GmbH
InventorsFrank Schulz, Michael Reik
Life of this patent
Estimating the term…
Abstract
A pressure control device has at least two switching valves (10, 12), a feedback control unit (14), a sensor unit (20), and a voltage supply unit (24), and continuously adjusts hydraulic systems.
Claims16
A pressure control device capable of continuous adjustment of hydraulic systems, the pressure control device comprising:
- a control unit with first and second transistors forming first and second individual controllers, respectively, controlling a pressure limiting function, respectively;
- leak-proof first and second selector valves controlled by first and second valve drivers having first and second electronic switches activated by said first and second transistors, respectively, said first and second selector valves forming a digital pressure control valve, being only settable in fully open and fully closed positions and not being settable in intermediate positions between the fully open and fully closed positions while performing pressure control;
- a sensor in fluid communication with said first and second selector valves;
- a first voltage supply electrically connected to said control unit;
- and
- a hydraulic consumer connected in fluid communication to a hydraulic pressure supply line extending between and being in fluid communication with said first and second selector valves.
3 more elements
A pressure control device capable of continuous adjustment of hydraulic systems, the pressure control device comprising:
- a control unit with first and second transistors forming first and second individual PID controllers, respectively, controlling a pressure reducing function and a pressure limiting function, respectively;
- leak-proof first and second selector valves controlled by first and second valve drivers having first and second electronic switches activated by said first and second transistors as parts of said control device, respectively, said first and second selector valves forming a digital pressure control valve, being capable of only being set in fully open and fully closed positions and incapable of being set in intermediate positions between the fully open and fully closed positions while performing pressure control and being provided with the pressure reducing function and the pressure limiting function by said first and second PID controllers, respectively;
- a sensor in fluid communication with said first and second selector valves;
- a first voltage supply electrically connected to said control unit;
- and
- a hydraulic consumer connected in fluid communication to a hydraulic pressure supply line extending between and being in fluid communication with said first and second selector valves.
3 more elements
Dependencies are inferred from the claim text.