Electrohydrostatic system with pressure sensor

摘要

The present invention concerns an electrohydrostatic system with a hydraulic cylinder comprising a first cylinder chamber and a second cylinder chamber. Furthermore, the electrohydrostatic system has a fluid hydraulic supply device to provide a hydraulic fluid, a fluid hydraulic engine pump unit,set up a fluid hydraulic volume stream to move the hydraulic cylinder. An engine control device is set up to provide a nominal current for an electric drive of the fluid hydraulic engine pump unit. In addition, the electrohydrostatic system has at least one fluid hydraulic safety valve which is connected to the fluid hydraulic pump unit on one side of the valve with one of the cylinder chambers of the hydraulic cylinder and on the other side of the valve. The fluid hydraulic safety valve can be bridged via a bypass connection with a fixed aperture,where the bypass connection is connected to the first valve side and to the second valve side of at least one fluid hydraulic safety valve. The electrohydrostatic system also features a pressure sensor connected to one of the cylinder chambers of the hydraulic cylinder. The pressure sensor shall be set up to detect a fluid hydraulic pressure at one of the cylinder chambers and to provide, according to the detected fluid hydraulic pressure, a release signal for the engine control device to provide the rated current for the electric drive of the fluid hydraulic engine pump unit.