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    HYDRAULIC CONTROL SYSTEM FOR WORKING MACHINE
    1.
    发明公开
    HYDRAULIC CONTROL SYSTEM FOR WORKING MACHINE 审中-公开

    公开(公告)号：EP3604826A1

    公开(公告)日：2020-02-05

    申请号：EP17898335.9

    申请日：2017-03-27

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： OGAWA Yuichi ,  HIJIKATA Seiji ,  HOSHINO Masatoshi

    IPC: F15B21/14 ,  F15B11/08 ,  F15B20/00

    Abstract: Provided is a work machine hydraulic control system capable of detecting abnormality in a pump output power switching device independently of the abnormality state of the pump output power switching device.
    A hydraulic control system of a hydraulic excavator is equipped with an accumulator 21 connected to a hydraulic line 25A between a pilot pump 17 and a pilot valve 20, an unloading valve 27 that is a pump output power switching device, a pressure sensor 29 detecting the pressure of the hydraulic fluid supplied to the pilot valve 20, and a controller 30 having a pump output power control section 31 switching the unloading valve 27 in accordance with the pressure detected by the pressure sensor 29. The controller 30 further has an abnormality determination section 32 that computes a command continuation time in a state in which a command output to the unloading valve 27 is not changed. In the case where this command continuation time is not less than a predetermined value, it determines that the unloading valve 27 is abnormal, and outputs the determination result.

    HYDRAULIC DRIVE SYSTEM OF INDUSTRIAL MACHINE
    2.
    发明公开
    HYDRAULIC DRIVE SYSTEM OF INDUSTRIAL MACHINE 审中-公开
    工业机械液压传动系统

    公开(公告)号：EP3309409A1

    公开(公告)日：2018-04-18

    申请号：EP16807361.7

    申请日：2016-06-01

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： HIJIKATA Seiji ,  ISHIKAWA Kouji ,  IMURA Shinya

    IPC: F15B20/00 ,  E02F9/22 ,  F15B21/14

    CPC classification number: E02F9/2203 ,  E02F9/2217 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  E02F9/268 ,  F15B20/00 ,  F15B20/002 ,  F15B20/004 ,  F15B20/007 ,  F15B21/14

    Abstract: A hydraulic drive system 100A for a work machine includes: a boom cylinder 4; an arm cylinder 8; a hydraulic pump device 51; a control valve 5; a regenerative device 61; a first operation device 41; a second operation device 42; a sensor device 71; and a controller 27. The sensor device 71 includes at least one of pressure sensors 23, 24, 25, and 26. The controller 27 includes an abnormality detection part 142 and a first control part. The abnormality detection part 142 determines whether or not the sensor device 71 is abnormal. If the sensor device 71 is abnormal, the first control part controls the regenerative device 61 such that the hydraulic fluid returning from the boom cylinder 4 is not supplied to the arm cylinder 8 even if the values measured by the sensor device 71 satisfy regenerative conditions.

    Abstract translation: 作业机械的液压驱动系统100A具备：动臂缸4， 斗杆缸8; 液压泵装置51; 控制阀5; 再生装置61; 第一操作装置41; 第二操作装置42; 传感器装置71; 以及控制器27.传感器装置71包括压力传感器23,24,25和26中的至少一个。控制器27包括异常检测部分142和第一控制部分。 异常检测部142判定传感器装置71是否异常。 如果传感器装置71异常，则第一控制部控制再生装置61，使得即使由传感器装置71测量的值满足再生条件，从动臂油缸4返回的液压流体也不被供应到悬臂油缸8。

    POWER REGENERATION DEVICE FOR WORK MACHINE
    4.
    发明公开
    POWER REGENERATION DEVICE FOR WORK MACHINE 审中-公开
    ENERGIERÜCKFÜHRUNGSVORRICHTUNGFÜREINE ARBEITSMASCHINE

    公开(公告)号：EP2672127A1

    公开(公告)日：2013-12-11

    申请号：EP12741503.2

    申请日：2012-01-20

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： FUJISHIMA Kazuo ,  SONODA Mitsuo ,  HIJIKATA Seiji

    IPC: F15B21/14 ,  E02F9/20 ,  E02F9/22 ,  F15B11/08

    CPC classification number: H02K7/1853 ,  E02F9/2075 ,  E02F9/2091 ,  E02F9/2217 ,  E02F9/2285 ,  F15B21/14 ,  F15B2211/353 ,  F15B2211/6654 ,  F15B2211/761

    Abstract: Disclosed is a motive power regeneration system for a working machine. The motive power regeneration apparatus includes a regeneration circuit (53) that is connected to a hydraulic line (51) through which a returning fluid of a boom cylinder (3A) is distributed during a boom lowering operation and provided with a hydraulic motor (24) connected to a generator (25), a flow regulating circuit (54) that is connected to the hydraulic line (51) and provided with a control valve (5A), an inverter (26) that controls the flow rate on the regeneration circuit (53) in accordance with a first flow rate setting (Q2) which varies with the operation amount of an operating apparatus (4A), and a control valve (5A) and a proportional valve (27) that control the flow rate on the flow regulating circuit (54) in accordance with a second flow rate setting (Q1) which varies with the operation amount of the operating apparatus (4A). Therefore, the motive power regeneration apparatus is capable of making an operator constantly feel comfortable with machine operations.

    Abstract translation: 公开了一种用于工作机器的动力再生系统。 动力再生装置包括再生回路53，该再生回路53连接于在动臂下降动作期间分配有动臂缸（3A）的返回流体的液压线路（51），并具备液压马达（24） 连接到发电机（25），连接到液压管路（51）并设置有控制阀（5A）的流量调节回路（54），控制再生回路上的流量的逆变器（26） 根据操作装置（4A）的操作量而变化的第一流量设定（Q2），以及控制流量调节用流量的控制阀（5A）和比例阀（27） 电路（54）根据随着操作装置（4A）的操作量而变化的第二流量设定（Q1）。 因此，动力再生装置能够使操作者对机器操作感到舒适。

    WORK MACHINE
    5.
    发明公开
    WORK MACHINE 审中-公开

    公开(公告)号：EP3591241A1

    公开(公告)日：2020-01-08

    申请号：EP18908807.3

    申请日：2018-03-08

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： HIJIKATA Seiji ,  ISHIKAWA Kouji ,  IMURA Shinya

    IPC: F15B21/14 ,  E02F9/22

    Abstract: Provided is a work machine capable of regenerating a return hydraulic fluid from a hydraulic actuator while preventing a drag loss of a regeneration hydraulic motor and a hydraulic pump from increasing and preventing the regeneration efficiency of the regeneration hydraulic motor from decreasing. A controller 100 computes a required regeneration hydraulic motor revolution speed from a displacement of a regeneration hydraulic motor 13 and a regeneration flow rate of the regeneration hydraulic motor, computes a required first hydraulic pump revolution speed from a displacement of a first hydraulic pump 15 and a target assist flow rate of the first hydraulic pump, and selects a greater one of the required regeneration hydraulic motor revolution speed and the required first hydraulic pump revolution speed as a target revolution speed of an electric motor 14.

    HYDRAULIC ENERGY RECOVERY APPARATUS OF WORKING MACHINE
    6.
    发明公开
    HYDRAULIC ENERGY RECOVERY APPARATUS OF WORKING MACHINE 审中-公开

    公开(公告)号：EP3581810A1

    公开(公告)日：2019-12-18

    申请号：EP18854003.3

    申请日：2018-05-18

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： TAKAHASHI Kiwamu ,  HIJIKATA Seiji ,  HOSHINO Masatoshi ,  OGAWA Yuichi ,  ISHIKAWA Kouji

    IPC: F15B21/14 ,  E02F9/22 ,  F15B1/02

    Abstract: A controller (45) is provided with an elapse time measuring section (47A) that measures an elapse time (tx) elapsed since an initial use of an accumulator (29) based upon a reset signal from a reset switch (44), a number-of-operations measuring section (47B) that measures a number of operations of the accumulator (29), that is, a number (N) of boom lowering operations after a reset, based upon a detection signal from an accumulator side pressure sensor (39), a gas permeation amount estimating section (47C) that estimates an estimation gas permeation amount (Qloss) of the accumulator (29), a sealed gas pressure estimating section (47D) that finds an estimation sealed gas pressure (Pgs) of a gas chamber (29B) of the accumulator (29), and an accumulator degradation determining section (47E) that determines a degradation condition of the accumulator (29) and outputs the determination result.

    CONSTRUCTION MACHINERY
    8.
    发明公开
    CONSTRUCTION MACHINERY 审中-公开

    公开(公告)号：EP3428456A1

    公开(公告)日：2019-01-16

    申请号：EP16891898.5

    申请日：2016-03-11

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： HOSHINO Masatoshi ,  TSURUGA Yasutaka ,  TAKAHASHI Kiwamu ,  HIJIKATA Seiji

    IPC: F15B11/00 ,  E02F9/22

    Abstract: The invention provides a construction machine in which the load torque at the time of engine start-up can be reduced even when the engine stops against the will of the operator.
    A hydraulic excavator includes a control device (35) having a pump displacement control section (37) and an unload control section (38). The pump displacement control section (37) makes the displacement of a hydraulic pump (16) variable to a minimum displacement by controlling a regulator device (20) when the speed of an engine (14) detected by a speed sensor (41) becomes equal to or less than a preset low speed N3 at the time of driving of the engine (14). The unload control section (40) controls an unloading valve (24) to the open position at the time of start-up of the engine (14).

    WORK MACHINE
    10.
    发明公开
    WORK MACHINE 审中-公开

    公开(公告)号：EP4190979A1

    公开(公告)日：2023-06-07

    申请号：EP21933268.1

    申请日：2021-12-17

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： HOSHINO Masatoshi ,  HIJIKATA Seiji ,  TSURUGA Yasutaka ,  YAGISAWA Ryou ,  FURUKAWA Shou

    IPC: E02F9/22 ,  F02D29/04

    Abstract: Provided is a work machine capable of achieving both low fuel consumption and ensuring of workability. The work machine is configured to, in a state where an output of an engine or hydraulic pump has increased to an increase threshold (S12: Yes) with the rotational speed being at a first rotational speed (S11: Yes), raise the rotational speed from the first rotational speed to a second rotational speed (S13); in a process of raising the rotational speed to the second rotational speed, output, to a regulator, a signal instructing reduction in the discharge rate (S14) so as to keep the output of the engine or hydraulic pump constant; and after the rotational speed has reached the second rotational speed, output, to the regulator, a signal instructing increase in the discharge rate (S16) so as to make the output of the engine or hydraulic pump have a value corresponding to a request load.

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