Control system for hydraulic power units
AssigneeMannesmann Rexroth GmbH
InventorsStefan Schmidt, Michael Reinert, Joachim Neumann
Life of this patent
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Abstract
The present invention relates to a control system for hydraulic power units, in particular hydraulic cylinder-piston-assemblies comprising a valve to be controlled by an electronic controller, the valve controlling the fluid path between the power unit, a pressure source and a reservoir. A pressure sensor and a circuit for differentiating the sensed pressure quantity in response to time is provided for sensing a respective output variable of the power unit. The pressure variation signal is utilized to assist operating the valve to improve the control operation, i.e. to dampen fluid vibrations or to decrease the hammering noise produced in the operation of stamping, nibbling or shearing machines.
Claims8
A control system for a hydraulic power unit, comprising:
- a valve;
- an electronic controller coupled to the valve for controlling fluid communication between the power unit, a fluid pressure source and a reservoir;
- a pressure sensor for providing a pressure signal in response to fluid pressure in a fluid line communicating with the hydraulic power unit;
- and
- a circuit for differentiating said pressure signal in single or multiple steps as a function of time to provide a pressure variation signal to be used for controlling said valve.
Dependencies are inferred from the claim text.