Hydraulic system and method for controlling a hydraulic system
AssigneePutzmeister Engineering GmbH
InventorChristian Ziemens
Life of this patent
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Abstract
A hydraulic system having a hydraulic pump, having a plurality of hydraulic loads and having a plurality of load-sensing valves for adjusting the pump performance of the hydraulic pump. An association unit is arranged between the hydraulic pump and the hydraulic loads and in a first switched state defines a first hydraulic path between the hydraulic pump and the hydraulic loads and in a second switched state defines a second hydraulic path between the hydraulic pump and the hydraulic loads. The system comprises a controller, which processes a state value of a hydraulic load as an input variable and which determines a control signal for the switched state of the association unit. The invention also relates to a method for controlling a hydraulic system.
Claims13
A hydraulic system comprising
- a plurality of hydraulic pumps;
- a plurality of hydraulic consumers, each hydraulic consumer having a state value which represents a current operating state of the hydraulic consumer;
- a plurality of load-sensing valves for setting the pumping capacity of the plurality of hydraulic pumps, said load sensing-valves having an adjustable opening cross-section;
- an allocation unit arranged between the plurality of hydraulic pumps and the plurality of hydraulic consumers, which allocation unit comprising a plurality of hydraulic switches that define a first hydraulic path between the plurality of hydraulic pumps and the plurality of hydraulic consumers in a first switching state of the plurality of hydraulic switches and a second hydraulic path between the plurality of hydraulic pumps and the plurality of hydraulic consumers in a second switching state of the plurality of hydraulic switches;
- and
- a controller which processes the state value of the plurality of hydraulic consumers as an input variable and which determines a control signal for the switching state of the allocation unit,
- wherein said allocation unit comprises a first allocation unit with an inlet end connected to receive hydraulic fluid from the plurality of load-sensing valves and an outlet end connected to deliver hydraulic fluid to the plurality of hydraulic consumers and a second allocation unit with an inlet end connected to receive hydraulic fluid from the plurality of hydraulic pumps and an outlet end connected to deliver hydraulic fluid to the plurality of load-sensing valves.
A method for controlling a hydraulic system, said method comprising:
- using a plurality of hydraulic pumps to supply a plurality of hydraulic consumers, each of said hydraulic consumers having a state value representative of an operating condition of the hydraulic consumer;
- providing a plurality of load-sensing valves between said plurality of hydraulic pumps and said plurality of hydraulic consumers, wherein an opening cross section of the load-sensing valves is adjustable;
- arranging an allocation unit between the plurality of hydraulic pumps and the plurality of hydraulic consumers, said allocation unit comprising a plurality of hydraulic switches operatively connected to said plurality of load-sensing valves to define a first hydraulic path between the plurality of hydraulic pumps and the hydraulic consumers in a first switching state of the plurality of hydraulic switches and define a second hydraulic path between the plurality of hydraulic pumps and the plurality of hydraulic consumers in a second switching state of the plurality of hydraulic switches, said allocation unit comprising a first allocation unit having an inlet end connected to receive hydraulic fluid from the plurality of hydraulic pumps and an outlet end connected to deliver hydraulic fluid to the plurality of load-sensing valves, and a second allocation unit having an inlet end connected to receive hydraulic fluid from the plurality of load-sensing valves and an outlet end connected to deliver hydraulic fluid to the plurality of hydraulic consumers;
- connecting said plurality of hydraulic consumers, first allocation unit and second allocation unit to a controller;
- processing the state value of the plurality of hydraulic consumers as an input variable in said controller to determine control signals to define the switching state of the first allocation unit and the second allocation unit.
Dependencies are inferred from the claim text.