Inverter parameter based hydraulic system control device

Abstract

The present invention relates to a control device for pressure control in a hydraulic system, especially of an elevator-system, the control device is adapted to control an output variable of an inverter supplying a hydraulic pump of the hydraulic system with electric energy, the output variable is adapted to adjust the speed of the hydraulic pump in order to at least partly compensate for a leakage of operating fluid in the hydraulic pump. Further, the invention relates to an elevator-system that includes a hydraulic pump, an inverter, and a control device which controls a supply of the hydraulic pump with electric energy from the inverter. Moreover, the invention relates to a method for pressure control in a hydraulic system, especially of an elevator-system, the method that includes the steps of supplying a hydraulic pump of the hydraulic system with electric energy from an inverter, controlling at least one output variable of the inverter for adjusting the speed of the hydraulic pump, in order to at least partly compensate for a leakage of operating fluid in the hydraulic pump. For providing an inexpensive elevating solution with good right quality for hydraulic elevators, the present invention provides that the control device includes a computing module which is adapted to determine the output variable based on at least one inverter parameter.

Dependencies are inferred from the claim text.