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    WORK MACHINE AND METHOD FOR CALIBRATING AN ELECTROHYDRAULIC PUMP IN AN OPEN CENTER HYDRAULIC SYSTEM
    1.
    发明公开
    WORK MACHINE AND METHOD FOR CALIBRATING AN ELECTROHYDRAULIC PUMP IN AN OPEN CENTER HYDRAULIC SYSTEM 审中-公开

    公开(公告)号：US20230407599A1

    公开(公告)日：2023-12-21

    申请号：US18459706

    申请日：2023-09-01

    申请人： Deere & Company

    发明人： Justin Sticksel ,  Aaron R. Kenkel ,  Jeffery Dobchuk ,  Bryan J. Rausch ,  Madeline T. Oglesby

    IPC分类号： E02F9/22

    CPC分类号： E02F9/2292 ,  E02F9/2296 ,  E02F9/2235 ,  E02F9/2246

    摘要： A work machine and method for a work machine with an open center hydraulic system for controlling actuation of an implement includes an implement control valve, an electro-hydraulically controlled pump, a hydraulic circuit coupled to the implement actuator, and a pressure transducer positioned for measuring a pressure in the hydraulic circuit between the pump and the implement control valve. A calibration system for calibrating the pump includes a controller having a non-transitory computer readable medium having a program instruction for causing a processor to calibrate a first pump threshold for the pump in a pump-flow curve wherein the first pump threshold including a minimum pump control signal to actuate the pump; determine a hysteresis band in the pump-flow curve; and calibrate a second pump threshold for the pump in the pump-flow curve wherein the second pump threshold including a maximum pump control signal to actuate the pump below a relief setpoint.

    Method of limiting flow through accelerometer feedback
    2.
    发明授权
    Method of limiting flow through accelerometer feedback 有权

    公开(公告)号：US11293168B2

    公开(公告)日：2022-04-05

    申请号：US15908574

    申请日：2018-02-28

    申请人： Deere & Company

    发明人： Aaron R. Kenkel ,  Grant R. Henn ,  Doug M. Lehmann

    IPC分类号： E02F3/42 ,  E02F9/22 ,  E02F3/28 ,  E02F3/342

    摘要： A control system for a material handling vehicle has a boom arm connected to a vehicle frame for rotation about the vehicle frame. An actuator is connected to the vehicle frame and the boom arm to cause the boom arm to rotate about the vehicle frame, and an attachment is connected to the boom arm for rotation with respect to the boom arm. The control system includes a controller that is configured to calculate a pre-determined acceleration limit of the attachment, and a sensor that senses acceleration of the attachment and communicate the sensed acceleration to the controller. The controller is configured to compare the pre-determined acceleration limit of the attachment to the sensed acceleration of the attachment and is configured to adjust a control valve to limit flow to the actuator in response to the sensed acceleration of the attachment being above the pre-determined acceleration upper limit.

    Hydraulic derate stability control
    5.
    发明授权
    Hydraulic derate stability control 有权

    公开(公告)号：US10954650B2

    公开(公告)日：2021-03-23

    申请号：US15908555

    申请日：2018-02-28

    申请人： Deere & Company

    发明人： David J. Myers ,  Doug M. Lehmann ,  Aaron R. Kenkel ,  Kyle E. Leinaar ,  Brian K. Kellogg

    IPC分类号： E02F9/22 ,  E02F3/42 ,  E02F3/28 ,  E02F9/20 ,  E02F3/342

    摘要： A work machine includes a mechanical arm and a work implement coupled to the mechanical arm. The work implement is configured to receive a load. A hydraulic actuator is coupled to the mechanical arm to move the arm between a first position and a second position. A sensor unit is configured to detect the load in the work implement. A valve is in fluid communication with the hydraulic actuator for supplying a fluid output to the hydraulic actuator. A controller is in communication with the value and the sensor unit. The controller is configured to transmit a control signal to the valve to adjust the fluid output to the hydraulic actuator, and wherein the controller is configured to derate the fluid output in response to a signal from the sensor unit that a load is at or above a threshold value.

    Method of testing cycle time of an implement on a work machine and system thereof
    6.
    发明授权
    Method of testing cycle time of an implement on a work machine and system thereof 有权

    公开(公告)号：US10125475B2

    公开(公告)日：2018-11-13

    申请号：US15428562

    申请日：2017-02-09

    申请人： Deere & Company

    发明人： Aaron R. Kenkel ,  Michael R. Gratton

    IPC分类号： E02F9/26 ,  E02F9/20 ,  G07C5/08 ,  G04F10/00 ,  E02F3/28 ,  E02F3/96

    摘要： A method of determining a cycle time of an implement on a work machine includes providing a controller and an actuator for controlling the implement, sending a first instruction from the controller to move the implement to a first position, and sending a second instruction from the controller to move the implement from the first position to a second position. A distance between the first position and the second position is an approximate full stroke of the actuator. The method also includes measuring an amount of time it takes for the implement to move between a first threshold position and a second threshold position. The first threshold position and the second threshold position are defined positions between the first and second positions. The method further includes determining the cycle time of the implement based on the measuring step.