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    VARIABLE LOAD SENSE SPRING SETTING FOR AXIAL PISTON OPEN CIRCUIT PUMP
    41.
    发明申请
    VARIABLE LOAD SENSE SPRING SETTING FOR AXIAL PISTON OPEN CIRCUIT PUMP 有权
    用于轴向活塞打开电路泵的可变负载感测弹簧设置

    公开(公告)号：US20150247496A1

    公开(公告)日：2015-09-03

    申请号：US14633653

    申请日：2015-02-27

    Applicant: DANFOSS POWER SOLUTIONS INC.

    Inventor： Abhijit DAS

    IPC: F04B49/06 ,  G06F17/11

    CPC classification number: F04B49/065 ,  F04B1/26 ,  G06F17/11

    Abstract: A variable load sense spring setting for an axial piston open circuit having three subsystems. A backstepping control applied to the first and second subsystems to determine an operator control input and a load sense spool effective open area control input that stabilize the first and second subsystems. The calculating a feasible load sense area from the third subsystem and the control inputs.

    Abstract translation: 一种用于具有三个子系统的轴向活塞开路的可变负载感应弹簧设置。 应用于第一和第二子系统的后台控制来确定操作员控制输入和稳定第一和第二子系统的负载感测线轴有效开放区域控制输入。 计算来自第三子系统和控制输入的可行负载感测区域。

    AUTOMATIC TOOL TILT COMMAND SYSTEM
    42.
    发明申请
    AUTOMATIC TOOL TILT COMMAND SYSTEM 有权

    公开(公告)号：US20250074758A1

    公开(公告)日：2025-03-06

    申请号：US18956648

    申请日：2024-11-22

    Applicant: DANFOSS POWER SOLUTIONS INC.

    Inventor： Christian S. Daley

    IPC: B66F9/22 ,  B66F9/16 ,  E02F9/20

    Abstract: An automatic tool tilt command system for a boom moveably connected with one end to a chassis of a working machine, wherein a tiltable tool is attachable to the other end. A first electronic control valve for controlling a fluid flow to and from a lift cylinder for moving the boom and a second electronic control valve for controlling a fluid flow to and from a tilt cylinder for tilting the tool. A control unit receives signals to move the boom and transmits signals to the first electronic control valve in order to move the boom. In parallel the control unit transmits signals to the second electronic control valve which are based on a predetermined fluid flow ratio defined by the fluid flow for the boom movement and the fluid flow for tool levelling, so that the tool maintains its inclination angle with respect to the horizontal.

    FAN DRIVE SYSTEM
    44.
    发明公开
    FAN DRIVE SYSTEM 审中-公开

    公开(公告)号：US20230417253A1

    公开(公告)日：2023-12-28

    申请号：US18250264

    申请日：2021-12-20

    Applicant: Danfoss Power Solutions Inc.

    Inventor： Elias NIELSEN

    IPC: F04D27/00 ,  F04D25/04

    CPC classification number: F04D27/004 ,  F04D25/04

    Abstract: The fan system includes a fan operated by a hydraulic motor which is driven by a hydraulic variable displacement pump that includes a displacement volume adjusting element. A tilt angle of the displacement volume adjusting element can be adjusted by controlling a tilt current supplied to an electronic displacement control unit. The hydraulic fan system further includes means for determining the volumetric flow rate of the pump and a control unit having: a signal connection to the means for determining the volumetric flow rate of the pump, a signal connection to a fan speed setting device, and a fan speed calculating unit for calculating a fan speed from the determined volumetric flow rate, a fan speed error determining unit for determining a fan speed error by comparing the calculated fan speed to the fan speed set by the fan speed setting device. The control unit can supply an adapted tilt current to the electronic displacement control unit in order to adjust the tilt angle of the displacement volume adjusting device, such that the volumetric flow rate can be adapted in order to reduce the fan speed error, wherein an ideal tilt current value is derived from the calculated fan speed and safety actions are performed in order to prevent damage to the fan, if the difference between the ideal tilt current value and the adapted tilt current is higher than a tilt current threshold value.

    LIFTING MECHANISM
    45.
    发明公开
    LIFTING MECHANISM 审中-公开

    公开(公告)号：US20230174353A1

    公开(公告)日：2023-06-08

    申请号：US17887736

    申请日：2022-08-15

    Applicant: Danfoss Power Solutions (Jiangsu) Co., Ltd. ,  Danfoss Power Solutions Inc.

    Inventor： Zhekang DU ,  Xiaozhong CHEN

    IPC: B66F3/32 ,  F15B13/02 ,  F15B15/18 ,  F15B13/06 ,  F15B11/04

    CPC classification number: B66F3/32 ,  F15B13/02 ,  F15B15/18 ,  F15B13/06 ,  F15B11/04 ,  F15B2211/40

    Abstract: The lifting mechanism includes a battery, an electric machine, a hydraulic pump, an oil tank, a hydraulic cylinder, a work platform and a proportional valve or switch valve. In the energy-regeneration mode, the hydraulic fluid drives the hydraulic pump to operate as a hydraulic motor, thus in turn driving the electric machine to operate as a generator and charge the battery. In the present application, the hydraulic pump operates to increase a pressure in a hydraulic line between the hydraulic pump and the proportional valve or switch valve before the proportional valve or switch valve is switched from a unidirectional communication position to a bidirectional communication position. When the proportional valve or switch valve is switched from the unidirectional communication position to the bidirectional communication position, by increasing the pressure in the hydraulic line, it could be avoided that the volume of hydraulic fluid has low pressure is compressed because the hydraulic fluid has low pressure is communicated with hydraulic fluid has high pressure; therefore a state of sudden drop of the work platform is avoided, and safety performance and operating experience of the lifting mechanism is improved.

    ANTI-STALL SYSTEM FOR OPEN CIRCUIT SYSTEMS
    49.
    发明申请
    ANTI-STALL SYSTEM FOR OPEN CIRCUIT SYSTEMS 有权

    公开(公告)号：US20220010528A1

    公开(公告)日：2022-01-13

    申请号：US17368979

    申请日：2021-07-07

    Applicant: Danfoss Power Solutions Inc.

    Inventor： Caleb Van De Stroet ,  Austin Hansell

    IPC: E02F9/22 ,  F02D29/04 ,  F02B63/06 ,  F15B20/00

    Abstract: An anti-stall system to prevent an engine, particularly a low-powered engine, from stalling when encountering a load that the machine is capable of overcoming but due to the nature of the engine, the load encounter would result in a stall. The system includes a hydraulic system in communication with a control system that has one or more sensors that detect, determine, and/or transmit an operational variable. The control system further comprises a plurality of anti-stall blocks having unique configurations, including a first configured to limit output flow upon determination of an engine droop, a second configured to limit output flow based on available engine torque, a third configured to limit output pressure upon rapid engine droop detection, and a fourth configured to prioritize and share output flow between the machine functions. The anti-stall blocks provide for complementary and cooperative configuration to prevent a stall from occurring based on responses to the detection and determination of various dynamic and continuous operational variables in real-time or near real-time with operational parameters.

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