HYDRAULIC SYSTEM FOR WORK MACHINE, AND METHOD FOR CONTROLLING HYDRAULIC SYSTEM FOR WORK MACHINE

WIPO Patent Application WO/2023/127436

A1

The present invention reduces oscillation of a movable member (21) smoothly.　A hydraulic system (S) of a work machine (1) comprises: a work device (20) having a movable member (21) and a hydraulic cylinder (22); an electromagnetic proportional valve (70); and a control device (80). The control device (80) is provided with: a first calculation unit (86) that calculates a first electric current value (I1) for decelerating the angular speed (ω) of the movable member (21); a second calculation unit (87) that calculates a second electric current value (I2) for reducing the supply flow rate of a hydraulic oil to the hydraulic cylinder (22); and an electric current limiting unit (88) that corrects an electric current to be supplied to the electromagnetic proportional valve (70) by using the second electric current value (I2) when a determination distance (H), which is an operation length (L) from a present operation position to a stroke end (E) of the hydraulic cylinder (22), is longer than a first threshold (T1) but not longer than a second threshold (T2), and corrects the electric current to be supplied to the electromagnetic proportional valve (70) by selecting one of the first electric current value (I1) and the second electric current value (I2) when the determination distance (H) is not longer than the first threshold (T1).

MORI HIROYA (JP)
HORII HIROSHI (JP)

PCT/JP2022/045019

July 06, 2023

December 07, 2022

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KUBOTA KK (JP)

E02F9/22

JPS62153091A	1987-07-08
JPH0777957B2	1995-08-23
JPS6160931A	1986-03-28

YASUDA & OKAMOTO PATENT ATTORNEYS (JP)

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