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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
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.
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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
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.
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公开(公告)号：US11536009B2
公开(公告)日：2022-12-27
申请号：US16523275
申请日：2019-07-26
申请人： Deere & Company
发明人： Doug M. Lehmann , Aaron R. Kenkel
摘要： A monitoring system for a work vehicle having a lift system to which an implement is attachable via a connection assembly includes a weight detection subsystem operable with the lift system and configured to transfer signals representative of a weight supported by the lift system. The monitoring system also includes a position detection subsystem operable with the connection assembly and configured to transfer signals representative of a state of the connection assembly. A controller is in operable communication with the weight detection subsystem and the position detection subsystem and is configured to receive signals from the weight detection subsystem and from the position detection subsystem, determine a condition of the connection assembly based on the signals received, and output a signal based at least in part on the determined condition.
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公开(公告)号：US11499292B2
公开(公告)日：2022-11-15
申请号：US16864696
申请日：2020-05-01
申请人： Deere & Company
发明人： Todd F. Velde , Madeline T. Oglesby , Lance R. Sherlock , Benjamin P. Koestler , Mark D. Anderson , Aaron R. Kenkel , Doug M. Lehmann , Craig Christofferson , Kenneth Franck , Christopher J. Meyer
摘要： In embodiments, a work vehicle magnetorheological fluid (MRF) joystick system includes a joystick device, an MRF joystick resistance mechanism, and a controller architecture. The joystick device includes, in turn, a base housing, a joystick, and a joystick position sensor. The MRF joystick resistance mechanism is controllable to selectively resist movement of the joystick relative to the base housing. The controller architecture is configured to: (i) when detecting operator rotation of the joystick in an operator input direction, determine whether continued joystick rotation in the operator input direction will misposition the work vehicle in a manner increasing at least one of work vehicle instability and a likelihood of work vehicle collision; and (ii) when determining that continued joystick rotation will misposition the work vehicle, command the MRF joystick resistance mechanism to generate an MRF resistance force deterring continued joystick rotation in the operator input direction.
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公开(公告)号：US10408241B2
公开(公告)日：2019-09-10
申请号：US15933478
申请日：2018-03-23
申请人： DEERE & COMPANY
摘要： In accordance with an example embodiment, a method includes monitoring a position of an actuator during operation of the actuator, determining that an actuator command value is greater than an actuator command value threshold, starting a timer upon a movement of the actuator through a starting position during the operation of the actuator at the actuator command value, determining satisfaction of at least one condition, and stopping the timer upon satisfaction of the at least one condition and movement of the actuator through an ending position.
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公开(公告)号：US10954654B2
公开(公告)日：2021-03-23
申请号：US15908561
申请日：2018-02-28
申请人： Deere & Company
摘要： A work machine includes systems and methods for stability control and for calibrating the stability control. During operation the load on a work implement is detected and it is determined if the load is at or above a threshold value. A derated fluid output is determined if the load is at or above the threshold value. A control signal is output to the valve based on the derated fluid output. During calibration the pressure in a hydraulic cylinder is detected at one or more locations as a mechanical arm moves between a lower position and an upper position. One or more baseline values are established for the mechanical arm between the lower position and the upper position.
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公开(公告)号：US20210025129A1
公开(公告)日：2021-01-28
申请号：US16522113
申请日：2019-07-25
申请人： Deere & Company
摘要： An actuator is connected to a frame and a boom arm to pivot the boom arm with respect to the frame. A spool valve directs fluid from a pump into a selected side of the actuator. A first anti-cavitation valve is fluidly positioned between the first end of the actuator and the reservoir to permit fluid flow from the reservoir to the first end of the actuator while the first anti-cavitation valve is open and inhibit fluid flow from the first end of the actuator to the reservoir. A second anti-cavitation valve is fluidly positioned between the second end of the actuator and the reservoir to permit fluid flow from the reservoir to the second end of the actuator while the second anti-cavitation valve is open and inhibit fluid flow from the second end of the actuator to the reservoir.
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公开(公告)号：US20190264424A1
公开(公告)日：2019-08-29
申请号：US15908583
申请日：2018-02-28
申请人： Deere & Company
发明人： Doug M. Lehmann , Grant R. Henn , Aaron R. Kenkel
摘要： A method of controlling hydraulic fluid flow to a material handling vehicle implement includes coupling a boom arm to a vehicle frame for rotation about the vehicle frame, rotating a boom arm with respect to the vehicle frame with a first actuator, coupling an attachment to the boom arm for rotation with respect to the boom arm, rotating the attachment with respect to the boom arm with a second actuator, sensing a velocity of the attachment, communicating the sensed velocity to a control system, sensing a weight of the attachment, communicating the sensed weight to the control system, calculating a kinetic energy of the attachment based upon the sensed velocity and the sensed weight of the attachment, and adjusting fluid flow through the control valve to limit a range of movement of the attachment in response to the calculated kinetic energy of the attachment exceeding a pre-determined kinetic energy.
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公开(公告)号：US20190264423A1
公开(公告)日：2019-08-29
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
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.
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