公开(公告)号：US20220082115A1

公开(公告)日：2022-03-17

申请号：US17425315

申请日：2020-01-23

Applicant: SMS group GmbH

Inventor： Michael ZIELENBACH ,  Jörn SOHLER ,  Peter HORN ,  Martin SCHMIDT

IPC: F15B11/10 ,  F15B21/08 ,  G05B19/042 ,  B21B35/00

Abstract: A hydraulic control loop controls a hydraulic adjusting cylinder. The cylinder has a cylindrical housing and a displaceable piston therein. The piston divides the housing interior into a first and a second hydraulic chamber. A first hydraulic valve supplies the first hydraulic chamber with hydraulic fluid. A hydraulic pressure of the first hydraulic chamber is adjustable by controlling the first hydraulic valve. A second hydraulic valve supplies the second hydraulic chamber with hydraulic fluid. A hydraulic pressure of the second hydraulic chamber is adjustable by controlling the second hydraulic valve. A control device controls the two hydraulic valves. In a position control state, the second hydraulic valve is controlled by a position control signal dependent on the working position of the piston and the first hydraulic valve is controlled by an adjusted position control signal, that is generated on the basis of the position control signal.