Overrunning pump protection for flow-controlled actuators
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United States of America Patent
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Oct 14, 2014
Grant Date -
Oct 18, 2012
app pub date -
Apr 18, 2011
filing date -
Apr 18, 2011
priority date (Note) -
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Abstract
A hydraulic system includes an actuator, a pump, rod side and cap side fluid connections between the pump and the rod and cap side chambers, respectively, at least one selectively actuatable regeneration valve that selectively provides flow from the cap side fluid connection to the rod side fluid connection, and a controller. The controller controls the pump to selectively vary the flow rate of the pump in response to a commanded motion to control movement of the piston. The controller actuates the regeneration valve during a retraction of the piston into the cylinder when pump is acting as a motor.
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