Control device of hydraulic winch
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United States of America Patent
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Aug 25, 2020
Grant Date -
Sep 19, 2019
app pub date -
Mar 11, 2019
filing date -
Mar 16, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
A control device of a hydraulic winch includes an engine, a hydraulic pump, a hydraulic motor driving a winch drum, a winch manipulating member, an engine control unit controlling a rotation speed of the engine, a winch load detector detecting a load applied to the winch drum, and a motor capacity control unit controlling a motor capacity of the hydraulic motor so as to decrease a motor capacity of the hydraulic motor in a fuel-saving operation mode to a motor capacity which is smaller than a motor capacity of the hydraulic motor in a normal operation mode. The engine control unit sets an upper limit value of the rotation speed of the engine in the fuel-saving operation mode to a value which is lower than a maximum rotation speed of the engine in the normal operation mode and corresponds to the load detected by the winch load detector.
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