Hydraulic device and method for regulating a hydraulic device

Abstract

The invention relates to a hydraulic device for supplying a plurality of work units (), in particular on a plastics injection moulding machine, said device comprising at least one controller (), at least one valve regulator and/or one valve controller and a central drive (). A regulating valve () with a regulating-valve geometry is provided on at least one of the work units (). Pressure sensors () detect at least one pressure both upstream and downstream of the regulating valve (), the load pressure () of at least one of the work units (), and the system pressure (). Since the valve regulator and/or the valve controller has knowledge about the regulating-valve geometry of the at least one regulating valve () and is designed to derive, from a relationship between the regulating-valve geometry and at least one pressure difference resulting from the pressures detected upstream and downstream of the regulating valve (), at least one volume flow rate actual value per regulating valve (), and the controller () is designed to derive, from the volume flow rate setpoint values of the at least one work unit () and/or the volume flow rate actual values of the at least one regulating valve (), at least one setpoint value feedforward control for the central drive () in such a way that the system pressure () corresponds at least to the relevant highest load pressure () of the work units (), the hydraulic device is improved in terms of functionality, energy, efficiency and economy.