Danfoss Power Solutions Aps

Frede Callesen

Dirk Wroblewski

A control arrangement () of a hydraulic system () is provided, said control arrangement () comprising a supply port arrangement having a high pressure port () and a low pressure port (), a working port arrangement having two working ports (), a first valve () arranged between said high pressure port () and said working port arrangement (), a second valve () arranged between said low pressure port () and said working port arrangement (). Such a control arrangement should enhance the control of a hydraulic system. To this end a controller () is provided for controlling said first valve () and said second valve (), said controller () has an input connection () for receiving a signal of an operator input device and on the basis of said signal said controller at least initially calculates an unbalance between a first flow demand for said first valve () and a second flow demand for said second valve (), and adjusts said first valve () according to said first flow demand and said second valve () according to said second flow demand.

Control arrangement of a hydraulic system and a method for controlling a hydraulic system

A hydraulic valve arrangement () is provided comprising comprising a supply port arrangement having a high pressure port () and a low pressure port (), a working port arrangement having two working ports (), a first valve () arranged between said high pressure port () and said working port arrangement (), a second valve () arranged between said low pressure port () and said working port arrangement (), a controller () for controlling said first valve () and said second valve (), said controller () having an input connection () for receiving a signal of an operator input device, and a regenerative flow path which can be established by means of at least one of said first valve () and said second valve (). The function of such a hydraulic valve arrangement should be enhanced. To this end said controller () said controller interrupts said regenerative flow path when a feed pressure at said working port arrangement () exceeds a predetermined pressure level.

Hydraulic valve arrangement

A valve group includes an inlet module and at least one service module connected to the inlet module, the inlet module having a housing, a pressure port, a pressure gallery, a tank port, a tank gallery, a spool movable in the housing to interrupt in a first position a connection between the pressure port and the pressure gallery and to connect in a second position the pressure port and the pressure gallery. A first pressure transducer is provided to detect a first pressure in the pressure gallery and a second pressure transducer is provided to detect a second pressure in the tank gallery, the pressure transducers being connected to a controller determining the position of the spool based on the pressures read from the pressure transducers.

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Odense S, Denmark

Frede Callesen