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    HYDRAULIC EXCAVATOR AND METHOD FOR MEASURING STROKE OF HYDRAULIC CYLINDER OF HYDRAULIC EXCAVATOR
    1.
    发明申请
    HYDRAULIC EXCAVATOR AND METHOD FOR MEASURING STROKE OF HYDRAULIC CYLINDER OF HYDRAULIC EXCAVATOR 有权
    液压挖掘机液压挖掘机液压缸液压挖掘机及其测量方法

    公开(公告)号：US20150066312A1

    公开(公告)日：2015-03-05

    申请号：US14342683

    申请日：2013-02-27

    Applicant: KOMATSU LTD.

    Inventor： Yukihiro Sakuda ,  Satoru Shintani ,  Masato Kageyama

    IPC: E02F9/26 ,  E02F9/22 ,  G01M17/00 ,  G01D5/26 ,  G01M13/00 ,  E02F3/42 ,  E02F3/43

    CPC classification number: E02F9/264 ,  E02F3/425 ,  E02F3/435 ,  E02F9/2271 ,  F15B15/04 ,  F15B15/28 ,  F15B15/2861 ,  F15B2211/6336 ,  F15B2211/6656 ,  F15B2211/7656 ,  G01B7/00 ,  G01B7/30 ,  G01D5/264 ,  G01M13/00 ,  G01M17/00

    Abstract: A hydraulic excavator includes a base body portion, a movable portion, a hydraulic cylinder, a position sensor, a rotary encoder, and a control unit. The rotary encoder includes a light emitting unit, a light receiving unit, and a disk unit having a plurality of transmission portions. The control unit measures the stroke length of the hydraulic cylinder by correcting deviation of the stroke length, which is measured by the position sensor, based on the pulse signal output from the rotary encoder. In this way, there can be obtained a hydraulic excavator capable of precisely measuring a stroke length of a hydraulic cylinder driving a work implement, as well as a method for measuring the stroke of the hydraulic cylinder of the hydraulic excavator.

    Abstract translation: 液压挖掘机包括基体部分，可移动部分，液压缸，位置传感器，旋转编码器和控制单元。 旋转编码器包括发光单元，光接收单元和具有多个传输部分的盘单元。 控制单元通过基于由旋转编码器输出的脉冲信号来校正由位置传感器测量的行程长度的偏差来测量液压缸的行程长度。 以这种方式，可以获得能够精确地测量驱动工作工具的液压缸的行程长度的液压挖掘机以及用于测量液压挖掘机的液压缸的冲程的方法。

    Filter state estimation system and filter state estimation method
    3.
    发明授权
    Filter state estimation system and filter state estimation method 有权

    公开(公告)号：US10695699B2

    公开(公告)日：2020-06-30

    申请号：US15577942

    申请日：2017-06-16

    Applicant: Komatsu Ltd.

    Inventor： Yuuki Yokoyama ,  Masato Kageyama

    IPC: B01D35/143 ,  B01D29/60 ,  E02F9/26 ,  E02F9/20 ,  B01D29/11 ,  B01D35/147 ,  B01D35/02 ,  E02F9/22 ,  F15B21/041 ,  F15B19/00 ,  E02F3/32

    Abstract: A filter state estimation system is configured to estimate a state of a filter provided in a hydraulic circuit. The hydraulic circuit includes: the filter; a bypass channel circumventing the filter and through which an oil flows; and a valve provided in the bypass channel and configured to be opened and closed based on a differential pressure. The filter state estimation system includes: a sensor to detect that the valve is in an open state or in a closed state; a temperature sensor to detect a temperature of the oil; and a state estimating unit to estimate a state of the filter based on detection results detected by the sensor and the temperature sensor. The state estimating unit estimates the state of the filter based on the temperature of the oil which is detected by the temperature sensor when the sensor detects that the valve is in the open state.

    HYDRAULIC CYLINDER SPOOL VALVE DEVICE
    6.
    发明申请
    HYDRAULIC CYLINDER SPOOL VALVE DEVICE 审中-公开

    公开(公告)号：US20190003497A1

    公开(公告)日：2019-01-03

    申请号：US16069207

    申请日：2016-01-29

    Applicant: Komatsu Ltd.

    Inventor： Shuuji Hori ,  Masato Kageyama ,  Mutsumi Ono ,  Hiroyuki Chikugo ,  Akira Hasebe ,  Junichi Fukushima ,  Shunsuke Koike

    IPC: F15B13/04 ,  F15B11/10 ,  F15B13/043 ,  F15B13/042 ,  F16K31/06

    Abstract: A hydraulic cylinder spool valve device, which extends and retracts a cylinder rod of a hydraulic cylinder, includes: a first spool valve having a first dead band and a first opening characteristic; a second spool valve having a second dead band and a second opening characteristic; and a controller performing communication with the hydraulic cylinder by using the first spool valve and positioning the second spool of the second spool valve within the second dead band and performing communication with the hydraulic cylinder by using the second spool valve and positioning the first spool of the first spool valve within the first dead band, and adjusting a characteristic of a switching dead band between the first opening characteristic and the second opening characteristic.

    Filter State Estimation System and Filter State Estimation Method
    7.
    发明申请
    Filter State Estimation System and Filter State Estimation Method 审中-公开

    公开(公告)号：US20180361283A1

    公开(公告)日：2018-12-20

    申请号：US15577942

    申请日：2017-06-16

    Applicant: Komatsu Ltd.

    Inventor： Yuuki Yokoyama ,  Masato Kageyama

    IPC: B01D35/143 ,  B01D35/147 ,  B01D29/60 ,  B01D35/02 ,  E02F9/22 ,  F15B21/04

    Abstract: A filter state estimation system is configured to estimate a state of a filter provided in a hydraulic circuit. The hydraulic circuit includes: the filter; a bypass channel circumventing the filter and through which an oil flows; and a valve provided in the bypass channel and configured to be opened and closed based on a differential pressure. The filter state estimation system includes: a sensor to detect that the valve is in an open state or in a closed state; a temperature sensor to detect a temperature of the oil; and a state estimating unit to estimate a state of the filter based on detection results detected by the sensor and the temperature sensor. The state estimating unit estimates the state of the filter based on the temperature of the oil which is detected by the temperature sensor when the sensor detects that the valve is in the open state.

    Work vehicle
    8.
    发明授权
    Work vehicle 有权

    公开(公告)号：US09909282B2

    公开(公告)日：2018-03-06

    申请号：US14771244

    申请日：2015-01-29

    Applicant: KOMATSU LTD.

    Inventor： Kazeto Kumamoto ,  Masato Kageyama

    IPC: E02F9/26 ,  E02F9/08 ,  E02F9/14 ,  E02F3/32

    CPC classification number: E02F9/26 ,  E02F3/32 ,  E02F9/0808 ,  E02F9/0833 ,  E02F9/0883 ,  E02F9/14 ,  E02F9/265

    Abstract: The hydraulic excavator comprises a revolving frame, a boom, a rotary encoder, and a link member. The revolving frame has a base plate and a first vertical plate and second vertical plate that are opposite each other and rise from the base plate. The boom is rotatably supported by the first vertical plate and the second vertical plate. The rotary encoder is provided at a position that is different from a position of the rotational axis of the boom, and senses the rotational angle of the boom according to the rotation of the boom. The link member transmits displacement of the boom to the rotary encoder.

    STROKE DETECTION DEVICE, STROKE DETECTION METHOD, STROKE DETECTION SYSTEM, OPERATION LEVER UNIT, AND OPERATION LEVER STROKE DETECTION SYSTEM
    9.
    发明申请
    STROKE DETECTION DEVICE, STROKE DETECTION METHOD, STROKE DETECTION SYSTEM, OPERATION LEVER UNIT, AND OPERATION LEVER STROKE DETECTION SYSTEM 审中-公开
    冲击检测装置，冲击检测方法，冲击检测系统，操作杆单元和操作杆检测系统

    公开(公告)号：US20150345991A1

    公开(公告)日：2015-12-03

    申请号：US14425428

    申请日：2014-10-06

    Applicant: KOMATSU LTD.

    Inventor： Masato Kageyama ,  Yoshiyuki Nagaya ,  Hiroyuki Chikugo ,  Daigoh Fujii

    IPC: G01D5/14 ,  F15B19/00

    CPC classification number: G01D5/14 ,  E02F9/2004 ,  F15B13/0424 ,  F15B19/005 ,  F16K11/185 ,  G01D5/145 ,  G05G9/047 ,  G05G2009/04755

    Abstract: A stroke detection device includes: four rods provided, moveably along respective axial directions, side by side on a same circumference of a device body, the stroke detection device detecting a change in relative positions of the four rods at a time the rods perform a stroke with respect to the device body; a magnet disposed to each of the rods such that a magnetic field is generated between rods adjacent to each other on the circumference and that the magnetic field varies at a time the rods adjacent to each other on the circumference perform a stroke relatively; and magnetic field detection units disposed on at least three positions between the magnets adjacent to each other in the device body, each of the magnetic field detection unit detecting the magnetic field between the magnets and outputting an electric signal in accordance with the detected magnetic field.

    Abstract translation: 行程检测装置包括：在装置主体的同一圆周上并排地设置有沿着各个轴向方向可动地设置的四个杆，所述行程检测装置检测在杆执行行程时四个杆的相对位置的变化 相对于装置体; 设置在每个杆上的磁体，使得在圆周上彼此相邻的杆之间产生磁场，并且磁场在圆周上彼此相邻的杆处相对地发生变化; 以及设置在所述装置主体中彼此相邻的磁体之间的至少三个位置的磁场检测单元，所述磁场检测单元中的每一个检测所述磁体之间的磁场，并根据所检测的磁场输出电信号。

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