Patents by Inventor Daito Sakai

Daito Sakai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11505923
    Abstract: A construction machine that can display various work devices including a bucket on a display device without causing a sense of discomfort is provided. A display controller is configured to deform a first drawing figure to create a first post-deformation drawing figure such that a triangle having vertexes at a first coupling point, a second coupling point and a first monitor point in the first drawing figure becomes congruent with a triangle having vertexes at the first coupling point, the second coupling point and the first monitor point in a coordinate system on an image on a display device, and arrange the first post-deformation drawing figure on a screen of the display device such that positions of the first coupling point, the second coupling point and the first monitor point in the first post-deformation drawing figure are arranged correspondingly to positions of the first coupling point, the second coupling point and the first monitor point, respectively, in the coordinate system on the image.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: November 22, 2022
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Kohei Hiromatsu, Shiho Izumi, Daito Sakai
  • Patent number: 11434623
    Abstract: A measurement controller (20): computes the position of a plane (S1) representing a side surface of a work implement (1A) in an image-capturing-device coordinate system (Co1) on the basis of an image of the side surface of the work implement captured by an image-capturing device (19) and an internal parameter of the image-capturing device; computes the coordinate values of a point on the work implement in the image-capturing-device coordinate system (Co1), the point corresponding to any pixel constituting the work implement on the captured image, on the basis of positional information on the pixel on the captured image and the position of the plane (S1); and converts the coordinate values of the point on the work implement in the image-capturing-device coordinate system, the point corresponding to the pixel, to coordinate values in a work-implement coordinate system (Co3) to output the coordinate values in the work-implement coordinate system (Co3) to a work-machine controller (50) of a hydraulic excavator (1
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: September 6, 2022
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Naoki Hayakawa, Kohei Hiromatsu, Daito Sakai, Shiho Izumi
  • Publication number: 20210156121
    Abstract: A measurement controller (20): computes the position of a plane (S1) representing a side surface of a work implement (1A) in an image-capturing-device coordinate system (Co1) on the basis of an image of the side surface of the work implement captured by an image-capturing device (19) and an internal parameter of the image-capturing device; computes the coordinate values of a point on the work implement in the image-capturing-device coordinate system (Co1), the point corresponding to any pixel constituting the work implement on the captured image, on the basis of positional information on the pixel on the captured image and the position of the plane (S1); and converts the coordinate values of the point on the work implement in the image-capturing-device coordinate system, the point corresponding to the pixel, to coordinate values in a work-implement coordinate system (Co3) to output the coordinate values in the work-implement coordinate system (Co3) to a work-machine controller (50) of a hydraulic excavator (1
    Type: Application
    Filed: September 25, 2018
    Publication date: May 27, 2021
    Inventors: Naoki HAYAKAWA, Kohei HIROMATSU, Daito SAKAI, Shiho IZUMI
  • Publication number: 20210047805
    Abstract: A construction machine that can display various work devices including a bucket on a display device without causing a sense of discomfort is provided. A display controller is configured to deform a first drawing figure to create a first post-deformation drawing figure such that a triangle having vertexes at a first coupling point, a second coupling point and a first monitor point in the first drawing figure becomes congruent with a triangle having vertexes at the first coupling point, the second coupling point and the first monitor point in a coordinate system on an image on a display device, and arrange the first post-deformation drawing figure on a screen of the display device such that positions of the first coupling point, the second coupling point and the first monitor point in the first post-deformation drawing figure are arranged correspondingly to positions of the first coupling point, the second coupling point and the first monitor point, respectively, in the coordinate system on the image.
    Type: Application
    Filed: December 17, 2018
    Publication date: February 18, 2021
    Inventors: Kohei HIROMATSU, Shiho IZUMI, Daito SAKAI
  • Patent number: 10801187
    Abstract: Provided is a work machine that is equipped with a control unit that executes area limiting control with respect to a work device. The control unit includes: a position computing section that calculates the position, on an operation plane, of the forward end (first reference point) of a bucket and the rear end (second reference point) of the bucket; and a first distance computing section that calculates the distances in the operating plane from the first reference point and the second reference point to the target face A to be controlled. When the smaller one of the two distances is equal to or lower than a threshold during area limiting control, the control unit corrects an operation signal output from an operation lever device so as to reduce the operating speed of a hydraulic actuator that is a control target of the operation signal.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: October 13, 2020
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shiho Izumi, Ryuu Narikawa, Kouji Ishikawa, Daito Sakai, Takahiko Kurose
  • Patent number: 10774502
    Abstract: A work machine includes: a multi-joint type work implement; a plurality of hydraulic actuators driving the work implement; an operation device outputting an operation signal to the plurality of hydraulic actuators; a storage section storing a target configuration defined by connecting a plurality of target surfaces; a control object surface selection section that in the case where a control point set at a claw tip of a bucket is under the target configuration, uses a target surface closest to the control point on the target configuration as a control object surface; and a target operation control section that controls the plurality of hydraulic actuators such that the operational range of the control point is limited to the control object surface and a region above the same in the case where an excavation operation is input from an operator via the operation device.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: September 15, 2020
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Daito Sakai, Shiho Izumi, Ryuu Narikawa, Kouji Ishikawa
  • Patent number: 10378186
    Abstract: When a work implement is actuated in such a manner that a work point is located at each of a plurality of positions on a datum line, a first work point position computing section calculates a position of the work point at each of the plurality of positions. A calibration value computing section calculates calibration values of angle conversion parameters (?bm, ?bm, ?am, ?am, ?bk, ?bk), dimension parameters (Lbm, Lam, Lbk), and line parameters (tilt tan ?, intercept Zline) using the fact that the positions of the work point at each of the plurality of positions calculated by the first work point position computing section can satisfy a linear equation indicating a datum line. A parameter update section reflects the calibration values calculated by the calibration value computing section in computation by a corresponding computing section that is one of the angle computing section and the first work point position computing section.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: August 13, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kohei Hiromatsu, Shiho Izumi, Yasuhiko Kanari, Daito Sakai
  • Publication number: 20190127946
    Abstract: A work machine includes: a multi-joint type work implement; a plurality of hydraulic actuators driving the work implement; an operation device outputting an operation signal to the plurality of hydraulic actuators; a storage section storing a target configuration defined by connecting a plurality of target surfaces; a control object surface selection section that in the case where a control point set at a claw tip of a bucket is under the target configuration, uses a target surface closest to the control point on the target configuration as a control object surface; and a target operation control section that controls the plurality of hydraulic actuators such that the operational range of the control point is limited to the control object surface and a region above the same in the case where an excavation operation is input from an operator via the operation device.
    Type: Application
    Filed: February 28, 2017
    Publication date: May 2, 2019
    Inventors: Daito SAKAI, Shiho IZUMI, Ryuu NARIKAWA, Kouji ISHIKAWA
  • Publication number: 20190119886
    Abstract: Provided is a work machine that is equipped with a control unit that executes area limiting control with respect to a work device. The control unit includes: a position computing section that calculates the position, on an operation plane, of the forward end (first reference point) of a bucket and the rear end (second reference point) of the bucket; and a first distance computing section that calculates the distances in the operating plane from the first reference point and the second reference point to the target face A to be controlled. When the smaller one of the two distances is equal to or lower than a threshold during area limiting control, the control unit corrects an operation signal output from an operation lever device so as to reduce the operating speed of a hydraulic actuator that is a control target of the operation signal.
    Type: Application
    Filed: February 28, 2017
    Publication date: April 25, 2019
    Inventors: Shiho IZUMI, Ryuu NARIKAWA, Kouji ISHIKAWA, Daito SAKAI, Takahiko KUROSE
  • Publication number: 20180282977
    Abstract: When a work implement is actuated in such a manner that a work point is located at each of a plurality of positions on a datum line, a first work point position computing section calculates a position of the work point at each of the plurality of positions. A calibration value computing section calculates calibration values of angle conversion parameters (?bm, ?bm, ?am, ?am, ?bk, ?bk), dimension parameters (Lbm, Lam, Lbk), and line parameters (tilt tan ?, intercept Zline) using the fact that the positions of the work point at each of the plurality of positions calculated by the first work point position computing section can satisfy a linear equation indicating a datum line. A parameter update section reflects the calibration values calculated by the calibration value computing section in computation by a corresponding computing section that is one of the angle computing section and the first work point position computing section.
    Type: Application
    Filed: December 19, 2017
    Publication date: October 4, 2018
    Inventors: Kohei HIROMATSU, Shiho Izumi, Yasuhiko Kanari, Daito Sakai