Hydraulic winch control system and method
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United States of America Patent
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May 30, 2017
Grant Date -
Mar 3, 2016
app pub date -
Aug 27, 2014
filing date -
Aug 27, 2014
priority date (Note) -
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Abstract
A hydraulic winch assembly uses a control algorithm that separates brake control from drum rotation to permit fine control of load position. Actuation of an operator interface to a first position displacement threshold will release a drum brake but will not activate a hydraulic pump for operating a hydraulic motor coupled to the drum until the operator interface is moved to a second position displacement threshold. During the operating condition when the brake is released but the pump is not operating, the force of a load applied to a cable coupled to the drum may cause the cable to slowly unwind from and rotate the drum, thereby permitting fine control of drum rotation. Additionally, when the pump is activated upon further movement of the operator interface, a speed of the motor may be modulated, such as by a gear ratio command, to permit precise control over lower drum speeds.
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