Moog Gmbh

Werner Händle

Achim Helbig

Tino Kentschke

Klaus Kirch

Eberhard Veil

Reiner Kohlhas

Michael Bürker

The present invention relates to an electro-hydrostatic system () with a hydraulic machine () which is driven by an electric motor () and has a variable volume and/or rotational speed for providing a volumetric flow rate of a hydraulic fluid, a differential cylinder () with a piston surface and with an annular surface, and at least one equalization container (), wherein the drive system () has a closed hydraulic circuit and during operation has an overpressure relative to the environment by means of the hydraulic machine () and/or a pretensioning source (), and the drive system () provides a movement of the cylinder in a first direction by means of a volumetric flow rate of the hydraulic machine () and a volumetric flow rate from the equalization container (), and provides a movement in a second direction by means of a volumetric flow rate of the hydraulic machine () and a volumetric flow rate into the equalization container (), and a power operating mode and a speed operating mode are provided with the differential cylinder ().

Electro-hydrostatic drive system

The invention relates to a hydraulic drive () comprising a working cylinder () and a travel cylinder () which is mechanically connected to the working cylinder (). The working cylinder () and the travel cylinder () each comprise an upper and a lower cylinder chamber (), and all four cylinder chambers () of the working and travel cylinder () are connected to one another in a suitable manner in a closed pressure circuit () which is filled and prestressed with a hydraulic fluid (F). A rotational speed-variable hydraulic machine () with a first and second pressure connection () is arranged in the pressure circuit () in order to conduct the hydraulic fluid (F) between the individual cylinder chambers () of the working and travel cylinder () during the operation (B) of the hydraulic drive (). At least one first and second distributing valve () are arranged in the pressure circuit () such that the respective valve switch positions () which are suitable for the different operating phases of the hydraulic drive () together with the suitably driven hydraulic machine () allow a common movement of the work and travel cylinder () in one or the other piston movement direction (R, R). For this purpose, preferably only the first and the second distributing valve () are arranged in the pressure circuit (). The hydraulic drive () requires a minimum number of components, maintains a low installation complexity, improves the energy efficiency, can be constructed in a compact manner, and can be operated in a sufficiently variable manner.

Hydraulic system

A method for the delay-minimized detection of an auxiliary control variable for a system comprising a control system and a controller, whereby an output variable is detected at the end of the control system, whereby a disturbance variable is active in the control system, characterized in that a state variable is detected in the control system at a place before the point of action of the disturbance variable, whereby the auxiliary control variable is calculated from the state variable that has been weighted with a constant kand from an estimation error, whereby the estimation error is calculated from a comparison between the detected output variable and the integrated auxiliary control variable.

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Marbach, Germany

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