Control device

A control device, comprising:

• a working cylinder having a piston-rod unit movable in a cylinder housing, the piston-rod unit dividing the cylinder housing into an annular chamber and a piston chamber;
• a valve housing having a pressure supply port and a return port on an input side of the valve housing and having first and second utility ports and first and second control ports, the first and second utility ports being connectable in fluid communication with the annular chamber and the piston chamber, respectively;
• first and second hydraulically unlockable valves connected in fluid communication the first and second control ports, respectively, between the working cylinder and the valve housing;
• a control spool guided for longitudinal movement in the valve housing and biased by an energy store to a middle positon in the valve housing in which the first and second utility ports and the first and second control ports are blocked from fluid communication with the pressure supply port, the control spool being movable to first and second switching positions on a first side of the middle position retracting the piston-rod unit into the cylinder housing and charging the annular chamber, respectively and to third and fourth switching positions on a second side of the middle position charging the piston chamber and extending the piston-rod unit from the cylinder housing, respectively;
• an electric motor actuating movement of the control spool in the valve housing from the middle position, the electric motor being controlled by control electronics;
• and
• first and second hydraulic accumulators connected in fluid communication to the annular chamber and the piston chamber, respectively;
• and
• a sensor detecting an operational state of the working cylinder and generating input signals received by the control electronics.