Hydraulic system for work machine, and method for controlling hydraulic system for work machine: Fid-Bau Portal

Hydraulic system for work machine, and method for controlling hydraulic system for work machine

MORI YUYA / HORII HIROSHI

A hydraulic system (S) for a working machine (1) is provided with: a working 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) having: a first calculation unit (86) that calculates a first current value (I1) that reduces the angular velocity (omega) of the movable member (21); a second calculation unit (87) that calculates a second current value (I2) that reduces the flow rate of hydraulic oil supplied to the hydraulic cylinder (22); and a current limiting unit (88) that corrects the current supplied to the electromagnetic proportional valve with a second current value when a determination distance (H), which is an operation length (L) from the current operation position of the hydraulic cylinder to the stroke end (E), is longer than a first threshold value (T1) and equal to or less than a second threshold value (T2), and corrects the current supplied to the electromagnetic proportional valve with a second current value when the determination distance (H) is equal to or less than the first threshold value (T1). Any one of the first current value and the second current value is selected to correct the current supplied to the electromagnetic proportional valve.

作业机(1)的液压系统(S)具有：作业装置(20)，具有可动部件(21)和液压缸(22)；电磁比例阀(70)；和控制装置(80)，控制装置(80)具有：第一运算部(86)，运算使可动部件(21)的角速度(ω)减速的第一电流值(I1)；第二运算部(87)，运算使工作油向液压缸(22)的供给流量减少的第二电流值(I2)；以及电流限制部(88)，在从液压缸的当前的动作位置到行程末端(E)的动作长度(L)即判定距离(H)比第一阈值(T1)长且为第二阈值(T2)以下的情况下，用第二电流值校正向电磁比例阀供给的电流，在判定距离(H)为第一阈值(T1)以下的情况下，选择第一电流值和第二电流值中的任一个校正向电磁比例阀供给的电流。

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