Patents by Inventor Jin Kitajima
Jin Kitajima 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).
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Patent number: 11591768Abstract: A control method of a work machine includes: calculating a maximum flow rate of hydraulic oil discharged from a hydraulic pump; calculating a first target speed of working equipment including a bucket based on an operation amount of an operation device operated for driving a plurality of hydraulic actuators to which the hydraulic oil discharged from the hydraulic pump is supplied to drive the working equipment and a distance between the bucket and a target excavation landform; calculating a second target speed of the working equipment based on the maximum flow rate, and the operation amount of the operation device and the distance between the bucket and the target excavation landform; and outputting a control signal for controlling the hydraulic actuators based on a smaller one of the first target speed and the second target speed.Type: GrantFiled: August 31, 2017Date of Patent: February 28, 2023Assignee: KOMATSU LTD.Inventors: Toru Matsuyama, Hikaru Suzuki, Jin Kitajima
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Patent number: 11085169Abstract: A work equipment control device includes a bucket posture-determining unit, a working plane-determining unit, and a bucket control unit. The bucket posture-determining unit determines an angle of a bucket in global coordinates. The working plane-determining unit determines an angle of a working plane in the global coordinates indicating a target shape of an excavation object of work equipment. The bucket control unit controls the bucket such that a difference between the angle of the bucket and the angle of the working plane maintains a uniform angle.Type: GrantFiled: November 29, 2017Date of Patent: August 10, 2021Assignee: Komatsu Ltd.Inventors: Toru Matsuyama, Jin Kitajima, Yuki Shimano
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Publication number: 20210222395Abstract: A control method of a work machine includes: calculating a maximum flow rate of hydraulic oil discharged from a hydraulic pump; calculating a first target speed of working equipment including a bucket based on an operation amount of an operation device operated for driving a plurality of hydraulic actuators to which the hydraulic oil discharged from the hydraulic pump is supplied to drive the working equipment and a distance between the bucket and a target excavation landform; calculating a second target speed of the working equipment based on the maximum flow rate, and the operation amount of the operation device and the distance between the bucket and the target excavation landform; and outputting a control signal for controlling the hydraulic actuators based on a smaller one of the first target speed and the second target speed.Type: ApplicationFiled: August 31, 2017Publication date: July 22, 2021Inventors: Toru Matsuyama, Hikaru Suzuki, Jin Kitajima
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Patent number: 10584463Abstract: A control device for a construction machine includes an operational amount data acquisition unit configured to acquire operational amount data indicating an operational amount of the working unit, an operation determination unit configured to determine a non-operation state of a bucket on the basis of the operational amount data, a bucket control determination unit configured to determine whether bucket control conditions are satisfied, on the basis of determination of the non-operation state, and a working unit control unit configured to output a control signal for controlling the bucket to maintain a state of the working unit, when the bucket control conditions are determined to be satisfied.Type: GrantFiled: November 29, 2016Date of Patent: March 10, 2020Assignee: Komatsu Ltd.Inventors: Toru Matsuyama, Jin Kitajima, Yuki Shimano
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Patent number: 10501911Abstract: A control device includes a bucket control unit and a speed restricting unit. The bucket control unit calculates a control speed controlling a bucket so as to maintain an angle of the work equipment at a constant angle. The speed restricting unit reduces the control speed when the bucket is driven at the control speed calculated by the bucket control unit and when a direction in which the bucket is driven and a direction in which the arm is driven coincide with each other.Type: GrantFiled: November 29, 2016Date of Patent: December 10, 2019Assignee: Komatsu Ltd.Inventors: Toru Matsuyama, Jin Kitajima
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Patent number: 10443214Abstract: A control system for a work vehicle includes at least one sensor, an operating device, and a controller. The operating device includes at least one operating member. The controller is programmed to control a work implement of the work vehicle based on signals from the at least one sensor and the operating device. The controller is further programmed to use the signals to obtain a distance between the work implement and a design terrain which represents a target shape of a work object, and to determine whether a surface compaction determination condition indicating that work performed by the work implement is surface compaction work is satisfied. The controller executes a surface compaction control in which a velocity of the work implement toward the design terrain is limited in response to the distance between the work implement and the design terrain when the surface compaction determination condition is satisfied.Type: GrantFiled: September 14, 2017Date of Patent: October 15, 2019Assignee: KOMATSU LTD.Inventors: Yuki Shimano, Jin Kitajima, Yoshiki Kami, Masashi Ichihara
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Patent number: 10364546Abstract: A distance obtaining unit obtains the distance between a work implement and a design terrain. A work aspect determining unit determines a work aspect by the work implement. A limit velocity deciding unit limits the velocity of the work implement when the distance between the work implement and the design terrain becomes smaller. When the work aspect is surface compaction work and the distance between the work implement and the design terrain is within a first range of at least a portion that is equal to or less than a predetermined first distance, the limit velocity deciding unit increases the limit velocity of the work implement in comparison to when the work aspect is an aspect of a work other than surface compaction, or cancels the limiting of the velocity of the work implement.Type: GrantFiled: March 17, 2016Date of Patent: July 30, 2019Assignee: KOMATSU LTD.Inventors: Yuki Shimano, Tomohiro Nakagawa, Masashi Ichihara, Jin Kitajima
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Patent number: 10352021Abstract: A work equipment control device includes a work equipment state specifying unit, a control reference specifying unit, a distance specifying unit, and a bucket control unit. The work equipment state specifying unit specifies a state of work equipment. The control reference specifying unit specifies a control reference of the work equipment. The distance specifying unit specifies a distance between the work equipment and the control reference. The bucket control unit generates a control command to drive a bucket such that the state of the work equipment is maintained when the distance between the work equipment and the control reference is less than a bucket control start threshold.Type: GrantFiled: November 29, 2016Date of Patent: July 16, 2019Assignee: Komatsu Ltd.Inventors: Toru Matsuyama, Jin Kitajima
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Publication number: 20190194905Abstract: A work equipment control device includes a bucket posture-determining unit, a working plane-determining unit, and a bucket control unit. The bucket posture-determining unit determines an angle of a bucket in global coordinates. The working plane-determining unit determines an angle of a working plane in the global coordinates indicating a target shape of an excavation object of work equipment. The bucket control unit controls the bucket such that a difference between the angle of the bucket and the angle of the working plane maintains a uniform angle.Type: ApplicationFiled: November 29, 2017Publication date: June 27, 2019Inventors: Toru Matsuyama, Jin Kitajima, Yuki Shimano
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Publication number: 20180266071Abstract: A control device includes a bucket control unit and a speed restricting unit. The bucket control unit calculates a control speed controlling a bucket so as to maintain an angle of the work equipment at a constant angle. The speed restricting unit reduces the control speed when the bucket is driven at the control speed calculated by the bucket control unit and when a direction in which the bucket is driven and a direction in which the arm is driven coincide with each other.Type: ApplicationFiled: November 29, 2016Publication date: September 20, 2018Applicants: Komatsu Ltd., Komatsu Ltd.Inventors: Toru Matsuyama, Jin Kitajima
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Publication number: 20180230672Abstract: A control device for a construction machine includes an operational amount data acquisition unit configured to acquire operational amount data indicating an operational amount of the working unit, an operation determination unit configured to determine a non-operation state of a bucket on the basis of the operational amount data, a bucket control determination unit configured to determine whether bucket control conditions are satisfied, on the basis of determination of the non-operation state, and a working unit control unit configured to output a control signal for controlling the bucket to maintain a state of the working unit, when the bucket control conditions are determined to be satisfied.Type: ApplicationFiled: November 29, 2016Publication date: August 16, 2018Inventors: Toru Matsuyama, Jin Kitajima, Yuki Shimano
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Patent number: 10017913Abstract: A construction machine control system includes: a target construction ground shape generation unit which generates a target construction ground shape indicating a target shape of an excavation target; a working device control instruction determination unit which outputs an instruction for driving the working device in a working device operation plane orthogonal to at least one of a boom axis, an arm axis, and a bucket axis based on an operation state of at least one of an arm and a bucket and a distance between the bucket and the target construction ground shape; and a tilting control instruction determination unit which outputs an instruction for performing a tilting control of the bucket about a tilting axis based on a tilting state of the bucket and the distance between the bucket and the target construction ground shape.Type: GrantFiled: May 31, 2016Date of Patent: July 10, 2018Assignee: Komatsu Ltd.Inventors: Tsutomu Iwamura, Jin Kitajima, Yoshiro Iwasaki, Yuto Fujii, Takashi Yokoo
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Patent number: 10006189Abstract: A control system controls a construction machine that includes a work machine including a bucket having a plurality of tilting mechanisms. The control system includes: a tilt angle sensor that is provided in the bucket so as to detect tilt angle data including a rotation angle of the bucket about the tilt shaft, the tilt angle sensor being capable of detecting an inclination angle with respect to a horizontal plane; a data acquisition unit to which the tilt angle data is output from the tilt angle sensor; a data fixing unit that fixes the tilt angle data output to the data acquisition unit based on a fixing command to generate fixed data; and a work machine control unit that controls the work machine based on the fixed data until the fixing command is disabled.Type: GrantFiled: May 9, 2017Date of Patent: June 26, 2018Assignee: Komatsu Ltd.Inventor: Jin Kitajima
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Publication number: 20180148905Abstract: A work equipment control device includes a work equipment state specifying unit, a control reference specifying unit, a distance specifying unit, and a bucket control unit. The work equipment state specifying unit specifies a state of work equipment. The control reference specifying unit specifies a control reference of the work equipment. The distance specifying unit specifies a distance between the work equipment and the control reference. The bucket control unit generates a control command to drive a bucket such that the state of the work equipment is maintained when the distance between the work equipment and the control reference is less than a bucket control start threshold.Type: ApplicationFiled: November 29, 2016Publication date: May 31, 2018Inventors: Toru Matsuyama, Jin Kitajima
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Publication number: 20180002901Abstract: A control system for a work vehicle includes at least one sensor, an operating device, and a controller. The operating device includes at least one operating member. The controller is programmed to control a work implement of the work vehicle based on signals from the at least one sensor and the operating device. The controller is further programmed to use the signals to obtain a distance between the work implement and a design terrain which represents a target shape of a work object, and to determine whether a surface compaction determination condition indicating that work performed by the work implement is surface compaction work is satisfied. The controller executes a surface compaction control in which a velocity of the work implement toward the design terrain is limited in response to the distance between the work implement and the design terrain when the surface compaction determination condition is satisfied.Type: ApplicationFiled: September 14, 2017Publication date: January 4, 2018Inventors: Yuki SHIMANO, Jin KITAJIMA, Yoshiki KAMI, Masashi ICHIHARA
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Patent number: 9856628Abstract: A control system controls a construction machine having a work machine including a tilting bucket. The control system includes: a first acquisition unit configured to acquire dimension data; a second acquisition unit configured to acquire external shape data of the bucket; a third acquisition unit configured to acquire target excavation landform data indicating a target excavation landform that is a two-dimensional target shape of an excavation object on a work machine operation plane perpendicular to a bucket axis; a fourth acquisition unit configured to acquire work machine angle data; a fifth acquisition unit configured to acquire tilt angle data indicating a turning angle of the bucket; and a calculation unit configured to obtain two-dimensional bucket data indicating an external shape of the bucket on the work machine operation plane on the basis of the dimension data, the external shape data, the work machine angle data, and the tilt angle data.Type: GrantFiled: June 2, 2014Date of Patent: January 2, 2018Assignee: Komatsu Ltd.Inventors: Jin Kitajima, Kazuki Takehara
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Publication number: 20170342679Abstract: A construction machine control system includes: a target construction ground shape generation unit which generates a target construction ground shape indicating a target shape of an excavation target; a working device control instruction determination unit which outputs an instruction for driving the working device in a working device operation plane orthogonal to at least one of a boom axis, an arm axis, and a bucket axis based on an operation state of at least one of an arm and a bucket and a distance between the bucket and the target construction ground shape; and a tilting control instruction determination unit which outputs an instruction for performing a tilting control of the bucket about a tilting axis based on a tilting state of the bucket and the distance between the bucket and the target construction ground shape.Type: ApplicationFiled: May 31, 2016Publication date: November 30, 2017Inventors: Tsutomu Iwamura, Jin Kitajima, Yoshiro Iwasaki, Yuto Fujii, Takashi Yokoo
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Patent number: 9803340Abstract: A control deciding unit for deciding to execute a leveling control for controlling a work implement so that the work implement moves along a design terrain when a leveling determination condition is satisfied. The control deciding unit decides to execute a surface compaction control for limiting the velocity of the work implement toward the design terrain in response to the distance between the work implement and the design terrain when a surface compaction determination condition is satisfied. The control deciding unit maintains the surface compaction control when the leveling determination condition is satisfied while the surface compaction control is being executed.Type: GrantFiled: March 17, 2016Date of Patent: October 31, 2017Assignee: KOMATSU LTD.Inventors: Yuki Shimano, Jin Kitajima, Yoshiki Kami, Masashi Ichihara
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Publication number: 20170268198Abstract: A distance obtaining unit obtains the distance between a work implement and a design terrain. A work aspect determining unit determines a work aspect by the work implement. A limit velocity deciding unit limits the velocity of the work implement when the distance between the work implement and the design terrain becomes smaller. When the work aspect is surface compaction work and the distance between the work implement and the design terrain is within a first range of at least a portion that is equal to or less than a predetermined first distance, the limit velocity deciding unit increases the limit velocity of the work implement in comparison to when the work aspect is an aspect of a work other than surface compaction, or cancels the limiting of the velocity of the work implement.Type: ApplicationFiled: March 17, 2016Publication date: September 21, 2017Inventors: Yuki SHIMANO, Tomohiro NAKAGAWA, Masashi ICHIHARA, Jin KITAJIMA
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Publication number: 20170268204Abstract: A control deciding unit for deciding to execute a leveling control for controlling a work implement so that the work implement moves along a design terrain when a leveling determination condition is satisfied. The control deciding unit decides to execute a surface compaction control for limiting the velocity of the work implement toward the design terrain in response to the distance between the work implement and the design terrain when a surface compaction determination condition is satisfied. The control deciding unit maintains the surface compaction control when the leveling determination condition is satisfied while the surface compaction control is being executed.Type: ApplicationFiled: March 17, 2016Publication date: September 21, 2017Inventors: Yuki SHIMANO, Jin KITAJIMA, Kami YOSHIKI, Masashi ICHIHARA