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HYDRAULIC SYSTEM FOR WORK MACHINE, AND METHOD FOR CONTROLLING HYDRAULIC SYSTEM FOR WORK MACHINE
Swing of the movable member (21) is smoothly decelerated.A hydraulic system (S) of a working machine (1) includes a working device (20) including a movable member (21) and a hydraulic cylinder (22), an electromagnetic proportional valve (70), and a controller (80), and the controller (80) includes a first calculator (86) that calculates a first electric current value (I1) for decelerating an angular velocity (ω) of the movable member (21), a second calculator (87) that calculates a second electric current value (I2) for decreasing a supply flow rate of a hydraulic fluid to the hydraulic cylinder (22), and an electric current restrictor (88) that corrects an electric current supplied to the electromagnetic proportional valve (70) by the second electric current value (I2) in a case where a determination distance (H), which is an operation length (L) from a current operation position of the hydraulic cylinder (22) to a stroke end (E), is longer than a first threshold value (T1) and is equal to or less than a second threshold value (T2) and corrects the electric current supplied to the electromagnetic proportional valve (70) by a selected one of the first electric current value (I1) and the second electric current value (I2) in a case where the determination distance (H) is equal to or less than the first threshold value (T1).
HYDRAULIC SYSTEM FOR WORK MACHINE, AND METHOD FOR CONTROLLING HYDRAULIC SYSTEM FOR WORK MACHINE
Swing of the movable member (21) is smoothly decelerated.A hydraulic system (S) of a working machine (1) includes a working device (20) including a movable member (21) and a hydraulic cylinder (22), an electromagnetic proportional valve (70), and a controller (80), and the controller (80) includes a first calculator (86) that calculates a first electric current value (I1) for decelerating an angular velocity (ω) of the movable member (21), a second calculator (87) that calculates a second electric current value (I2) for decreasing a supply flow rate of a hydraulic fluid to the hydraulic cylinder (22), and an electric current restrictor (88) that corrects an electric current supplied to the electromagnetic proportional valve (70) by the second electric current value (I2) in a case where a determination distance (H), which is an operation length (L) from a current operation position of the hydraulic cylinder (22) to a stroke end (E), is longer than a first threshold value (T1) and is equal to or less than a second threshold value (T2) and corrects the electric current supplied to the electromagnetic proportional valve (70) by a selected one of the first electric current value (I1) and the second electric current value (I2) in a case where the determination distance (H) is equal to or less than the first threshold value (T1).
HYDRAULIC SYSTEM FOR WORK MACHINE, AND METHOD FOR CONTROLLING HYDRAULIC SYSTEM FOR WORK MACHINE
HYDRAULIKSYSTEM FÜR EINE ARBEITSMASCHINE UND VERFAHREN ZUR STEUERUNG DES HYDRAULIKSYSTEMS FÜR EINE ARBEITSMASCHINE
SYSTÈME HYDRAULIQUE POUR ENGIN DE CHANTIER ET PROCÉDÉ DE COMMANDE DE SYSTÈME HYDRAULIQUE POUR ENGIN DE CHANTIER
MORI HIROYA (author) / HORII HIROSHI (author)
2024-11-06
Patent
Electronic Resource
English
IPC:
E02F
Baggern
,
DREDGING
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