METHOD FOR OPERATING A HYDRAULIC PUMP ARRANGEMENT, AND HYDRAULIC PUMP ARRANGEMENT
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United States of America Patent
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Issued Date -
Jan 15, 2015
app pub date -
Feb 29, 2012
filing date -
Feb 29, 2012
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Abstract
A hydraulic pump arrangement of a portable hydraulic tool operates by an autonomous power supply or is releasably connected to the hydraulic tool by a hose and driven by an electrical power source. A load-dependent control of the hydraulic pump switches between a loaded state and a non-loaded state. A higher electrical power supply is implemented for the loaded state and a lower electrical power supply is implemented for the non-loaded state. To provide energy savings and problem-free operation even in different system pressure conditions, a method fixes a control variable for the load-dependent control that is dependent on work being performed by the hydraulic pump motor. A first threshold value at which switching from the non-loaded state to the loaded state takes place and a second threshold value at which switching from the loaded state to the non-loaded state takes place are assigned to the control variable.
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