Method and device for controlling a hydraulic installation of a utility vehicle
AssigneeMannesman Rexoth AG
InventorJoerg Dantlgraber
Life of this patent
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Abstract
What is disclosed is a method for controlling a hydraulic cylinder acting against a load, and a hydraulic installation of a utility vehicle operating in accordance with this method, wherein the pressure in the supply line to the effective areas of the hydraulic cylinder is maintained at a level that approximately corresponds to the pressure level in a hydraulic accumulator for supplying the hydraulic installation.
Claims9
A method for controlling a multistage hydraulic cylinder of an implement, that acts on a load, including at least two selectively connectable active areas and being supplied with hydraulic fluid via a hydraulic pump, a hydraulic accumulator and a respective control valve assigned to each active area, said method comprising the steps of:
- detecting an operating pressure in a pressure line leading to the hydraulic cylinder;
- and
- controlling each control valve of each active area of the hydraulic cylinder as a function of the detected operating pressure such that a resulting operating pressure corresponds to a target pressure that permits the hydraulic fluid to return from the hydraulic cylinder to the hydraulic accumulator.
A hydraulic system for an implement, said system including a hydraulic cylinder to which hydraulic fluid is suppliable from a hydraulic accumulator and/or a hydropump via a control valve for advancing, holding or retracting a piston, the hydraulic cylinder including a plurality of active areas that are selectively controllable for actuating the hydraulic cylinder, wherein a respective valve is assigned to each active area and a control apparatus is provided that controls the valves depending on the operating pressure in the pressure line leading to the hydraulic cylinder, said controlling being effected such that a resulting operating pressure corresponds to a target pressure that permits the hydraulic fluid to return from the hydraulic cylinder to the hydraulic accumulator.
Dependencies are inferred from the claim text.