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    Hybrid Work Machine
    21.
    发明申请
    Hybrid Work Machine 审中-公开

    公开(公告)号：US20180258613A1

    公开(公告)日：2018-09-13

    申请号：US15758273

    申请日：2016-09-02

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： Hiroaki AMANO ,  Shinya IMURA ,  Ryouhei YAMASHITA ,  Shinji ISHIHARA ,  Shinji NISHIKAWA ,  Masafumi HITA

    IPC分类号： E02F9/20 ,  B60K6/28 ,  B60K6/485 ,  B60L11/14 ,  B60W10/26

    摘要： A hybrid work machine that can suppress excessive limiting on pump absorption power even in a situation in which supply of electric power to an electric motor is limited is provided. The hybrid work machine includes: an engine 22; an assist generator motor 23 connected to the engine 22 in such a manner that a torque can be transmitted to the engine 22; an electric storage device 24 that supplies electric power to the assist generator motor 23; a monitoring device 28 that monitors the electric storage device 24 and that acquires electric storage device information; a hydraulic pump 41 driven by the engine 22 and the assist generator motor 23; and a pump regulator 43 that regulates a delivery flow rate of the hydraulic pump 41. The hybrid work machine includes: an increasing rate computing section 81 that computes an allowable increasing rate r in response to the electric storage device information for pump absorption power; a limited power computing section 82 that computes a limited value WPlim of the pump absorption power on the basis of the allowable increasing rate r; and a pump control section 86 that controls the delivery flow rate of the hydraulic pump 41 in response to the limited pump power WPlim.

    HYDRAULIC SYSTEM FOR WORK MACHINES
    22.
    发明申请
    HYDRAULIC SYSTEM FOR WORK MACHINES 审中-公开

    公开(公告)号：US20180058042A1

    公开(公告)日：2018-03-01

    申请号：US15554536

    申请日：2015-09-25

    申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

    发明人： Hidekazu MORIKI ,  Shinya IMURA ,  Shiho IZUMI ,  Hiroaki AMANO ,  Kouji ISHIKAWA

    IPC分类号： E02F9/22

    摘要： A hydraulic system for a work machine includes a first hydraulic pump driving a swing hydraulic motor; a second hydraulic pumps driving a boom cylinder; a first pump displacement increase valve controlling a volume of the first hydraulic pump; a swing pilot pressure sensor detecting a swing operation amount; a boom raising pilot pressure sensor detecting a boom raising operation amount; and a controller controlling a control signal to the first pump displacement increase valve on the basis of the swing operation amount and the boom raising operation amount. The controller controls the control signal in such a manner that a delivery rate of the first hydraulic pump becomes higher as the swing operation amount is larger and an increasing rate of the delivery rate of the first hydraulic pump becomes lower as the boom raising operation amount is larger during a swing boom raising operation.