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    Speed control system for crane and winch applications
    41.
    发明授权
    Speed control system for crane and winch applications 有权

    公开(公告)号：US11613451B2

    公开(公告)日：2023-03-28

    申请号：US16734899

    申请日：2020-01-06

    Applicant: DANFOSS POWER SOLUTIONS II Technology A/S

    Inventor： Vincent Joseph Duray ,  Jerry Carl Weber

    IPC: B66D1/40 ,  B66D1/44 ,  B66D1/08 ,  B66D1/02

    Abstract: The present disclosure relates to a hydraulic system including a variable displacement hydraulic motor for lifting and lowering a load. The hydraulic motor has a high operating speed and a low operating speed. The system also includes an actuator for controlling whether the hydraulic motor is operating at the high or low speed, and a pressure sensor for sensing when a system pressure corresponding to the hydraulic motor exceeds a threshold pressure value. The system further includes a speed control system that controls the actuator such that the hydraulic motor is prevented from operating at the first operating speed when the system pressure exceeds the threshold pressure value.

    Pilot control mechanism for boom bounce reduction
    42.
    发明授权
    Pilot control mechanism for boom bounce reduction 有权

    公开(公告)号：US11566642B2

    公开(公告)日：2023-01-31

    申请号：US17303465

    申请日：2021-05-28

    Applicant: Danfoss Power Solutions II Technology A/S

    Inventor： Meng (Rachel) Wang ,  Michael Berne Rannow

    IPC: F15B21/00 ,  F15B11/044 ,  B66C13/06 ,  E02F9/22 ,  F15B11/00 ,  E04G21/04 ,  F16F15/023 ,  F16F15/027

    Abstract: A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.

    System with motion sensors for damping mass-induced vibration in machines
    43.
    发明授权
    System with motion sensors for damping mass-induced vibration in machines 有权

    公开(公告)号：US11536298B2

    公开(公告)日：2022-12-27

    申请号：US17562449

    申请日：2021-12-27

    Applicant: Danfoss Power Solutions II Technology A/S

    Inventor： QingHui Yuan

    IPC: F15B21/00 ,  E04G21/04 ,  E02F9/22 ,  F15B13/01 ,  F15B15/20 ,  F15B20/00

    Abstract: A system for damping mass-induced vibrations in a machine having a long boom or elongate member, the movement of which causes mass-induced vibration in such boom or elongate member. The system comprises at least one motion sensor operable to measure movement of such boom or elongate member resulting from mass-induced vibration, and a processing unit operable to control a first control valve spool in a pressure control mode and a second control valve spool in a flow control mode in order to adjust the hydraulic fluid flow to the load holding chamber of an actuator attached to the boom or elongate member to dampen the mass-induced vibration. The system further comprises a control manifold fluidically interposed between the actuator and control valve spools that causes the first and second control valve spools to operate, respectively, in pressure and flow control modes.

    INTEGRATED PRESSURE DIAGNOSTIC FOR OFF-HIGHWAY STEERING ISOLATION CIRCUIT
    48.
    发明申请
    INTEGRATED PRESSURE DIAGNOSTIC FOR OFF-HIGHWAY STEERING ISOLATION CIRCUIT 有权

    公开(公告)号：US20230063904A1

    公开(公告)日：2023-03-02

    申请号：US17795651

    申请日：2020-12-30

    Applicant: Danfoss Power Solutions II Technology A/S

    Inventor： Kenneth Marshall BEFUS

    IPC: F15B19/00 ,  B62D5/09 ,  B62D5/08 ,  B62D5/06 ,  F15B13/02

    Abstract: A system and method for detecting the functional state of a piloted or direct-operated isolation valve in a hydraulic circuit is presented. In some examples the hydraulic circuit is a steering circuit and the isolation valve provides selective isolation between a hydraulic actuator and one or more metering valves. In some examples, the isolation valve assembly is movable between a first position, in which fluid flow between the metering valve and the actuator is enabled, and a second position, in which fluid flow between the metering valve and the actuator is blocked. When the isolation valve assembly is moved to one of the first and second positions, an inlet port and a pressure sensing port of the isolation valve assembly are placed in fluid communication with each other. When the isolation valve assembly is moved to the other of the first or second position, a second inlet port and the pressure sensing port are placed in fluid communication.

    SYSTEM AND DEVICE FOR ANTICIPATING AND CORRECTING FOR OVER-CENTER TRANSITIONS IN MOBILE HYDRAULIC MACHINE
    50.
    发明申请
    SYSTEM AND DEVICE FOR ANTICIPATING AND CORRECTING FOR OVER-CENTER TRANSITIONS IN MOBILE HYDRAULIC MACHINE 有权

    公开(公告)号：US20220364326A1

    公开(公告)日：2022-11-17

    申请号：US17832203

    申请日：2022-06-03

    Applicant: Danfoss Power Solutions II Technology A/S

    Inventor： Aaron H. JAGODA

    IPC: E02F9/22 ,  F15B21/00

    Abstract: A mobile hydraulic system includes a hydraulic actuator coupled to a load, and a control unit coupled to the load and/or to the hydraulic actuator. The control unit is adapted to anticipate an over-center transition of the load relative to a gravity vector prior to the over-center transition through the use of sensors configured with accelerometers, gyroscopes and magnetometers. In some examples, the over-center transition is from an overrunning driving of the load to a passive driving of the load. In some examples, the over-center transition is from a passive driving of the load to an overrunning driving of the load. In some examples, the control unit is adapted to control change in a metered flow through one or more ports of the associated actuator to minimize and/or prevent one or more hydraulic effects of the anticipated over-center transition. In some examples, the control unit controls the metered flow by causing one or more actuators (e.g., a solenoid) to shift one or more valve positions to change the flow through one or more ports of the associated actuator.

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