Hydraulic system for working machine and control method of the hydraulic system

    公开(公告)号:US11713557B2

    公开(公告)日:2023-08-01

    申请号:US16901453

    申请日:2020-06-15

    摘要: A hydraulic system includes: a boom cylinder to move a boom; a working tool cylinder to move a working tool attached to the boom; a boom control valve to control the boom cylinder; a working tool control valve to control the working tool cylinder; a horizontal control valve having: an activating position to allow a horizontalizing operation of the working tool; and a stopping position to stop the horizontalizing operation; and a controller device having: a first information obtaining portion to obtain permission and non-permission to the horizontalizing operation; a second information obtaining portion to obtain at least one of upward operation and upward movement of the boom; and a horizontal controller to set the horizontal control valve to the stopping position when the first information obtaining portion obtains the non-permission and the second information obtaining portion obtains one of the upward operation and the upward movement.

    HYDRAULIC SYSTEM FOR WORKING MACHINE
    22.
    发明公开

    公开(公告)号:US20230160179A1

    公开(公告)日:2023-05-25

    申请号:US18099454

    申请日:2023-01-20

    发明人: Yuji FUKUDA

    IPC分类号: E02F9/22 E02F3/42 F15B11/16

    摘要: A hydraulic system for a working machine includes hydraulic actuators actuated with hydraulic fluid delivered from a hydraulic pump, control valves each of which is shiftable among shift positions to control a flowrate of hydraulic fluid flowing to the corresponding hydraulic actuator, a detection fluid passage, an interlocking control valve, and a pressure detection unit. Each control valve includes an input port, an output port, and a flowrate reduction section. One of the control valves includes a flowrate increase section. The interlocking control valve is configured to be shifted in accordance with a shift of the one of the control valves among the shift positions and to be shifted to a blocking position to block a pilot fluid introduced into the interlocking control valve from the detection fluid passage when the one of the control valves is shifted to the increase position.

    Hydraulic circuit for construction machine, and hydraulic circuit

    公开(公告)号:US11591775B2

    公开(公告)日:2023-02-28

    申请号:US17440753

    申请日:2020-03-06

    IPC分类号: E02F9/22 E02F3/32 E02F3/42

    摘要: Provided is a hydraulic circuit, for a construction machine, which drives an actuator by merging pressure oil from a fixed-volume pump into a center bypass oil path from a variable-volume pump to an oil tank, wherein the flow rate of flow from the fixed-volume pump to the center bypass oil path can be controlled in accordance with a requested flow rate of the actuator. A distribution direction-switching valve, which has a first oil path from a fixed-volume pump to an oil tank and a second oil path from the fixed-volume pump to a first center bypass oil path, has a first signal reception unit which causes a spool to slide in a direction in which the first oil path is formed, and a second signal reception unit which causes a spool to slide in a direction in which the second oil path is formed, and determines a distribution ratio of pressure oil flowing to the first oil path and the second oil path in accordance with the difference in size of the signals received by the first signal reception unit and the second signal reception unit, the first signal reception unit receiving a signal based on a negative control signal.

    CONTROL OF A HYDRAULIC SYSTEM
    24.
    发明申请

    公开(公告)号:US20230043231A1

    公开(公告)日:2023-02-09

    申请号:US17444405

    申请日:2021-08-04

    申请人: Caterpillar Inc.

    IPC分类号: E02F3/42 E02F9/22 E02F3/43

    摘要: 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.

    Working machine
    25.
    发明授权

    公开(公告)号:US11572675B2

    公开(公告)日:2023-02-07

    申请号:US17861915

    申请日:2022-07-11

    摘要: A working machine comprises an operation member for operating a hydraulic device via a control valve. An oscillation calculator acquires a specific value corresponding to a feature representing oscillation of the operation member when the feature appears in variation of an control signal output according to an operation amount of the operation member within one of a sequence of predetermined periods, and calculates an evaluation value representing a degree of oscillation of the operation member by adding up the specific value or values obtained within one or more of the predetermined periods. A control signal generator generates a control signal for controlling the control valve based on the operation signal. The control signal generator decreases a value of the control signal per a unit value of the operation signal as the evaluation value gradually increases with the elapse of one or more of the sequence of the predetermined periods.

    SYSTEM AND METHOD FOR BUCKET AGITATION DURING AUTOMATED PAYLOAD TIP-OFF

    公开(公告)号:US20220325497A1

    公开(公告)日:2022-10-13

    申请号:US17229489

    申请日:2021-04-13

    申请人: Caterpillar Inc.

    IPC分类号: E02F3/42

    摘要: A wheel loader machine includes a bucket configured to hold a predetermined load of a granular or powder material, a hydraulic system having an electro-hydraulic actuator to move the bucket over tilt angles and to shake the bucket, a hydraulic sensor configured to detect hydraulic pressure, an interface configured to receive input parameters and to output status information of the bucket, and a controller. The input parameters including a target weight of the granular or powder material. The status information including weight of the granular or powder material in the bucket determined using the detected hydraulic pressure. The controller configured to control the hydraulic system to tilt the bucket to a predetermined tilt angle and to shake the bucket in accordance with an agitation pattern until the weight of the granular or powder in the bucket is at or below the target weight of the granular or powder material.

    Construction Machine
    27.
    发明申请

    公开(公告)号:US20220282448A1

    公开(公告)日:2022-09-08

    申请号:US17637726

    申请日:2020-10-06

    摘要: Provided is a construction machine configured such that a hydraulic actuator is driven by a hydraulic pump for a closed circuit, by which oil film breakage of the hydraulic pump for a closed circuit is prevented to improve the reliability and a high operation rate can be obtained. The construction machine includes a switching valve that is provided in a branch hydraulic line connecting one of suction/delivery ports of a closed circuit pump and a charge line to each other and is opened and closed according to a control signal from a controller. The controller is configured to, in a case where a state in which a delivery volume of the closed circuit pump is kept to zero continues for a predetermined time period or more, open the switching valve and keep the delivery volume of the closed circuit pump to a predetermined delivery volume or more, the predetermined delivery volume being greater than zero.

    PIN ACTUATION SYSTEM AND METHOD
    28.
    发明申请

    公开(公告)号:US20220251805A1

    公开(公告)日:2022-08-11

    申请号:US17171522

    申请日:2021-02-09

    申请人: DEERE & COMPANY

    IPC分类号: E02F9/22 E02F3/42

    摘要: A system for operating a work vehicle includes a hydraulic control assembly and a controller. The hydraulic control assembly includes a pump, accumulator, boom hydraulic cylinder, pin hydraulic cylinder, pin control valve, and ride control valve assembly. The boom hydraulic cylinder moves a boom of the work vehicle. The pin hydraulic cylinder moves a pin on the boom. The ride control valve assembly includes a charge valve and discharge valve. The charge valve is in fluid communication with the pump and the accumulator. The discharge valve is in fluid communication with the accumulator and a reservoir. The controller operates the work vehicle in a ride control mode and pin actuation mode. The pin actuation mode includes opening the charge valve with the discharge valve closed, and directing hydraulic fluid through the pin control valve.

    CONSTRUCTION EQUIPMENT
    29.
    发明申请

    公开(公告)号:US20220243421A1

    公开(公告)日:2022-08-04

    申请号:US17591155

    申请日:2022-02-02

    发明人: Alexandre Gateau

    IPC分类号: E02F3/42 E02F9/20

    摘要: A construction equipment includes an electric actuator including a rod extending along a longitudinal axis, a sliding member movable along the rod, an electric motor for converting electrical power into a movement of the sliding member along the longitudinal axis, a connecting rod including a first end which is articulated on sliding member and a second end which is articulated on a first element of the construction equipment in order to move the first element relative to a second element or inversely and guiding means for guiding the movement of the sliding member the longitudinal axis. The electric motor, the rod and the sliding member are integrated into the second element of the construction equipment.

    MULTI-POSITION HYDRAULIC COUPLING ATTACHMENT

    公开(公告)号:US20220213668A1

    公开(公告)日:2022-07-07

    申请号:US17655954

    申请日:2022-03-22

    IPC分类号: E02F9/22 E02F3/36 E02F3/42

    摘要: Some embodiments of the invention provide a lift arm including an attachment assembly and an electrical supply line having a first end and a second end. The first end is fixed in relation to the lift arm and the second end has a connector coupled to a mounting plate. The lift arm includes a first bracket affixed to the lift arm and a second bracket affixed to the attachment assembly. The mounting plate is moveable between and removably securable to the first bracket and the second bracket.