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公开(公告)号：US20210332559A1
公开(公告)日：2021-10-28
申请号：US16858367
申请日：2020-04-24
Applicant: Caterpillar Inc.
Inventor： Rustin Glenn METZGER , Adam Martin NACKERS , Joshua Aaron FOSSUM , Christopher M. RUEMELIN , Corey Lee GORMAN
Abstract: A hydraulic circuit is disclosed. The hydraulic circuit may include a hydrostatic pump to provide, at a flow rate, a fluid to a hydraulic motor, wherein the hydrostatic pump has a displacement, and wherein the hydraulic motor drives a swinging element; a swing circuit pressure sensor to sense a circuit pressure of the hydraulic circuit; a pilot pressure actuator to control, based on a supply pressure, the displacement of the hydrostatic pump; a pilot pressure override valve to control the supply pressure; and a controller configured to adjust, based on sensed signals and with the pilot pressure override valve, the supply pressure, wherein the sensed signals include: a circuit pressure signal based on the circuit pressure sensed by the swing circuit pressure sensor; and a sensed swing speed signal based on a swing speed of the swinging element sensed by one or more machine sensors.
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Patent Agency Ranking
公开(公告)号：US20210301500A1
公开(公告)日：2021-09-30
申请号：US17301867
申请日：2021-04-16
Applicant: Caterpillar Inc.
Inventor： Rustin Glenn METZGER , Corey Lee GORMAN , Adam Martin NACKERS
Abstract: A hydraulic system controller is disclosed. The hydraulic system controller may determine a maximum active circuit pressure of a set of active hydraulic circuits of the hydraulic system, wherein the hydraulic system includes a hydraulic pump to cause fluid to flow throughout the set of active hydraulic circuits; determine a circuit pressure of a hydraulic circuit of the hydraulic system; determine, based on a hydraulic flow command for the hydraulic circuit and the circuit pressure, a desired circuit delta-pressure for the hydraulic circuit; determine, based on the desired circuit delta-pressure and a pressure difference between the maximum active circuit pressure and the circuit pressure, a circuit valve setting for a circuit valve of the hydraulic circuit; and cause a control device to set a position of the circuit valve according to the circuit valve setting.
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公开(公告)号：US20180373275A1
公开(公告)日：2018-12-27
申请号：US15629172
申请日：2017-06-21
Applicant: CATERPILLAR INC.
CPC classification number: G05D16/08 , E02F9/2235 , E02F9/2246 , E02F9/264 , E02F9/265 , G01C21/165 , G01N33/28 , G01S17/023 , G01S17/89
Abstract: A method of using sensor feedback for controlling fluid pressures in a machine includes receiving from each of a plurality of Inertial Measurement Units (IMU's) mounted on different components of the machine, a time series of signals indicative of acceleration and angular rate of motion measurements for each of the components of the machine on which one or more of the plurality of IMU's are mounted, and receiving from at least one non-IMU sensor, a signal indicative of at least one of position, velocity, or acceleration of at least one of the machine components, position, velocity, or acceleration of any potential obstacles or other features at a job site where the machine is operating, a fluid pressure, an engine speed, a fluid relief pressure, a maximum pump output pressure, or an operator input. The method includes fusing the signals received from the IMU's with each other, with a signal from the at least one non-IMU sensor, and in reference to a machine reference frame to determine best estimates of current output joint angles for each of the plurality of components of the machine with reference to the machine reference frame. The method still further includes solving a kinematic equation using the best estimates of current output joint angles for the components of the machine and structural design information characterizing the machine, determining whether a higher fluid pressure to a fluid actuation cylinder connected between two of the machine components is required to avoid stalling of one of the two machine components relative to the other of the two machine components under load after each successive timestep of the series of timesteps, or whether an adjustment to a pressure cut off for a fluid pump on the machine is required for an operation.
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公开(公告)号：US20230043231A1
公开(公告)日：2023-02-09
申请号：US17444405
申请日：2021-08-04
Applicant: Caterpillar Inc.
Inventor： Adam Martin NACKERS , Rustin Glenn METZGER , Chris Rustu CESUR , Steven D. SPENCER
Abstract: A hydraulic system may include a first actuator to control a first linkage member, a second actuator to control a second linkage member, a first primary hydraulic circuit and a first secondary hydraulic circuit that include the first actuator, a second primary hydraulic circuit and a second secondary hydraulic circuit that include the second actuator, a first pump to cause fluid to flow through the first primary hydraulic circuit and the second secondary hydraulic circuit, a second pump to cause fluid to flow through the second primary hydraulic circuit and the first secondary hydraulic circuit, and a controller. The controller may be configured to determine that an operator assistance mode is enabled, and cause closing of a first valve that controls fluid flow through the first secondary hydraulic circuit and a second valve that controls fluid flow through the second secondary hydraulic circuit.
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公开(公告)号：US20210332555A1
公开(公告)日：2021-10-28
申请号：US16860585
申请日：2020-04-28
Applicant: CATERPILLAR INC.
Inventor： Rustin Glenn METZGER , Adam Martin NACKERS , Joshua Aaron FOSSUM , Christopher M. RUEMELIN , Corey Lee GORMAN
Abstract: A swing motion control system for an earth-moving machine may include a closed loop hydraulic circuit including a hydrostatic swing pump fluidly coupled to at least one hydraulic swing motor configured to control a swing mechanism of the earth-moving machine, a pressure control device configured to control the pressure of fluid supplied to the hydrostatic swing pump for control of the pressure output by the pump, and a controller. The controller may be configured to monitor and process signals received from sensors and operator input, wherein the signals received from the sensors are indicative of machine position and pose, and inertia mass of swing components and a payload being moved by the swing mechanism of the machine, and control at least one of an offset amount for desired pump displacement by the hydrostatic swing pump or an offset amount for pump output pressure from the hydrostatic swing pump based on at least one of an amount of slope on which the machine is operating or the inertia mass of the swing components and payload.
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公开(公告)号：US20190323201A1
公开(公告)日：2019-10-24
申请号：US15956324
申请日：2018-04-18
Applicant: Caterpillar Inc.
Inventor： Terril James Johnson , David Eugene COOPER , Anthony Dean McNEALY , Matthew BUNGE , Andrew SUMNERS , Rustin Glenn METZGER , Corey Lee GORMAN , Brad Robert VAN DE VEER
Abstract: An excavator machine includes an undercarriage assembly including a drive assembly, and a carriage assembly rotatably coupled to the undercarriage assembly and including an operator cab positioned at a front of the carriage assembly. The excavator machine also includes a boom assembly. The boom assembly is coupled to the carriage assembly via two branches, and the branches are coupled to the carriage assembly on opposing sides of the operator cab.
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