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    WORK MACHINE
    2.
    发明公开
    WORK MACHINE 审中-实审

    公开(公告)号：EP4379150A1

    公开(公告)日：2024-06-05

    申请号：EP23781022.1

    申请日：2023-03-30

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： IGARASHI Teruki ,  TANAKA Hiroaki ,  FUKUCHI Ryohei ,  SUZUKI Yusuke

    IPC分类号： E02F9/20 ,  F15B11/042 ,  F15B11/044 ,  F15B11/08

    CPC分类号： F15B11/042 ,  F15B11/08 ,  E02F9/20 ,  F15B11/044

    摘要： A work machine includes a flow control valve that controls the flow rate of a hydraulic operating fluid supplied from a hydraulic pump to a hydraulic cylinder, a solenoid valve that generates an operation pressure for operating the flow control valve, and a controller. The controller executes learning processing of changing in a stepwise manner the operation pressure generated by the solenoid valve, sensing the pressure of the hydraulic cylinder, and storing the operation pressure when the pressure of the hydraulic cylinder has become a reference value, as a learning result operation pressure. The controller calculates a differential pressure across the flow control valve and computes a target opening area of the flow control valve on the basis of the differential pressure across the flow control valve and a target flow rate of the hydraulic operating fluid that passes through the flow control valve. The controller computes a target value of the operation pressure generated by the solenoid valve, on the basis of an opening characteristic table, the target opening area, and the learning result operation pressure, and controls the solenoid valve on the basis of the target value of the operation pressure.

    A COUNTER PRESSURE VALVE ARRANGEMENT
    7.
    发明公开
    A COUNTER PRESSURE VALVE ARRANGEMENT 审中-公开

    公开(公告)号：EP4209683A1

    公开(公告)日：2023-07-12

    申请号：EP22215092.2

    申请日：2022-12-20

    申请人： Parker Hannifin EMEA S.à.r.l.

    发明人： BARI, Mahdi ,  HEINERUD, Nils ,  KARLSSON, Anders ,  NILSTAM, Bo

    IPC分类号： F15B11/044 ,  F15B13/02 ,  F15B13/04 ,  F15B13/043 ,  F15B21/047

    摘要： A counter pressure valve arrangement (5) for controlling a pressure level of a hydraulic fluid in a return line (4) from a hydraulic actuator arrangement. The counter pressure valve arrangement (5) comprises a counter pressure valve (6) having: a moveable valve member (22); a counter pressure regulating port (7) configured for being connected to the hydraulic actuator arrangement via the return line (4); a tank port (8) configured for being connected to a tank (3) or low pressure reservoir for storing low pressure hydraulic fluid; and a pump port (10) configured for being connected to a source of pressurised hydraulic fluid (2, 11). A first position of the valve member (22) effects fluid communication between the pump port (10) and the counter pressure regulating port (7) for supplying pressurised hydraulic fluid to the return line (4), and a second position of the valve member (22) effects fluid communication between the counter pressure regulating port (7) and the tank port (8) for discharging hydraulic fluid from the return line (4) to the tank (3).

    HYDRAULIC DRIVE SYSTEM
    8.
    发明公开
    HYDRAULIC DRIVE SYSTEM 审中-公开

    公开(公告)号：EP4170187A1

    公开(公告)日：2023-04-26

    申请号：EP21825891.1

    申请日：2021-04-27

    申请人： KAWASAKI JUKOGYO KABUSHIKI KAISHA

    发明人： NOSE, Tomomichi ,  KAWASAKI, Hayato ,  MURAOKA, Hideyasu ,  KINOSHITA, Nobuyuki

    IPC分类号： F15B11/024 ,  E02F9/22 ,  F15B11/028 ,  F15B11/044

    摘要： This hydraulic drive system includes: a hydraulic pump that supplies a working fluid to a hydraulic actuator; a meter-in control valve that controls a flow rate of the working fluid flowing from the hydraulic pump to the hydraulic actuator; a meter-out control valve that controls a flow rate of the working fluid being drained from the hydraulic actuator into a tank; and a regeneration valve that supplies, to the hydraulic actuator, the working fluid drained from the hydraulic actuator. The meter-out control valve is connected to the hydraulic actuator in parallel with the regeneration valve.

    METHOD AND CONTROL SYSTEM OF AN ACTUATOR OF AN ARM OF AN AGRICULTURAL OR WORK VEHICLE
    10.
    发明公开
    METHOD AND CONTROL SYSTEM OF AN ACTUATOR OF AN ARM OF AN AGRICULTURAL OR WORK VEHICLE 审中-公开

    公开(公告)号：EP4033036A1

    公开(公告)日：2022-07-27

    申请号：EP22152571.0

    申请日：2022-01-20

    申请人： CNH Industrial Italia S.p.A.

    发明人： GARRAMONE, Adriano ,  GRAVILI, Andrea ,  LIBERTI, Stefano

    IPC分类号： E02F3/43 ,  A01B63/10 ,  E02F9/20 ,  E02F9/22 ,  F15B11/044

    摘要： Control method of an actuator of an arm of an agricultural or work vehicle subject to a load, in which the arm (B) comprises at least one element (AR, TL) directly or indirectly hinged to a vehicle frame (F) and a double action actuator (A1, A2) comprising a lifting chamber (CH1) and a lowering chamber (CH2) opposite the lifting chamber and a directional valve (V1, V2), the method comprising a first step (ST1) of calculate a flow value of hydraulic oil directed to the lowering chamber (CH2) from the directional valve and a corresponding first flow value (F1) of hydraulic oil destined to be discharged from the lifting chamber (CH1), a second step (ST2) of detecting a second flow value (F2) of hydraulic oil actually discharged from the lifting chamber due to the load and a third step (ST3) of adjusting the directional valve (V1, V2) so as to force said second value to equate the first flow value, when the second value exceeds the first (CK = Yes).