Control system for hydraulic power units
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United States of America Patent
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Jan 12, 1999
Grant Date -
N/A
app pub date -
Aug 8, 1997
filing date -
Aug 12, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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