Hydraulic control apparatus and method
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United States of America Patent
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May 16, 2017
Issued Date -
N/A
app pub date -
Mar 18, 2014
filing date -
Sep 21, 2011
priority date (Note) -
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Abstract
A hydraulic control apparatus is disclosed which includes an unloading valve controlling part; an command value calculating part configured to calculate, based on an operation amount of an operation member for changing a position of the directional control valve and a discharge pressure of the hydraulic pump, a virtual negative control pressure, and calculates a control command value for the hydraulic pump based on the virtual negative control pressure; and a correcting part configured to operate under the situation where the directional control valve is in such a state that the fluid path to the hydraulic actuator is closed, wherein the correcting part corrects the control command value or a parameter, which is used in calculating the control command value, such that a discharge flow rate of the hydraulic pump is a predetermined flow rate.
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