actuator system (1; 51) with actuator control (2) to control a fluid cylinder (3; 53) and with a fluid cylinder (3; 53),trained to provide a linear movement, with actuator control (2) a processing device (7) for the processing of control orders, a valve device (8) for influencing flow flows between a fluid source (19) and a fluid cylinder (3; 53),a supply connection (16) for a fluid connection of the valve device (8) to the fluid cylinder (3; 53) and a sensor device (12) associated with the fluid cylinder (3; 53) for the determination of a flow pressure gradient (16) including a cylinder housing (3; 53) (27; 59) with a cylinder bore (28),which is formed along a movement axis (29), a working piston incorporated linearly in the cylinder bore (28);which together with a perimeter wall section (32) and a front wall section (30; 60) of the cylinder housing (27; 59) determines a variable working space (34), includes a fluid connection (44) for an intake of fluid into the workspace (34) and for a discharge of fluid from the workspace (34) and where the working piston (4) in the workspace (34) is movable between a first end position (39) and a second end position (40), thereby characterized, that the working piston (4) and the cylinder housing (27; 59) form a signalling device in the area of the first end position (39),which, when the working flask is approached (4) to the first end position (39) is designed to provide a flow signal to the fluid connection (44) and that the processing device (7) is so designed to evaluate a sensor signal of the sensor device (12) that the working flask is approached (4) is traceable to the first end position (39) on the basis of the flow signal.
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