HYDRAULIC SYSTEM OF WORKING MACHINE AND METHOD FOR CONTROLLING HYDRAULIC SYSTEM OF WORKING MACHINE: Fid-Bau Portal

HYDRAULIC SYSTEM OF WORKING MACHINE AND METHOD FOR CONTROLLING HYDRAULIC SYSTEM OF WORKING MACHINE

MORI HIROYA / HORII HIROSHI

In a hydraulic system of a working device, a controller includes a first calculator that calculates a first electric current value for decelerating an angular velocity of a movable member, a second calculator that calculates a second electric current value for decreasing a supply flow rate of a hydraulic fluid to a hydraulic cylinder, and an electric current restrictor that corrects an electric current supplied to an electromagnetic proportional valve by the second electric current value if a determination distance of an operation length from a current operation position of the hydraulic cylinder to a stroke end is longer than a first threshold value and is not more than a second threshold value and corrects the electric current supplied to the electromagnetic proportional valve by either the selected first or second electric current value if the determination distance is not more than the first threshold value.

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