Patents Assigned to Komatsu Ltd.
  • Publication number: 20240167247
    Abstract: A hydraulic excavator includes a vehicular body, a boom bottom pin supported by the vehicular body, a boom rotatably coupled to the vehicular body by the boom bottom pin, a boom top pin attached to a tip end of the boom, an arm rotatably coupled to the boom by the boom top pin, an arm top pin attached to a tip end of the arm, and a bucket rotatably coupled to the arm by the arm top pin. The computing device calculates a weight of a load conveyed by a work implement based on any two equilibrium equations of an equation of moment equilibrium around the boom bottom pin, an equation of moment equilibrium around the boom top pin, and an equation of moment equilibrium around the arm top pin.
    Type: Application
    Filed: January 24, 2022
    Publication date: May 23, 2024
    Applicant: KOMATSU LTD.
    Inventors: Minoru SHIMIZU, Shota YAMAWAKI, Motoki KOYAMA
  • Patent number: 11987956
    Abstract: A work vehicle controls an engine output based on an accelerator operation amount and a work equipment operation amount. A control device for the work vehicle includes an acceleration correction unit, a target vehicle speed determination unit, and a deceleration correction unit. The acceleration correction unit obtains a corrected accelerator operation amount by correcting the accelerator operation amount based on an inching operation amount. The target vehicle speed determination unit determines a target vehicle speed based on the corrected accelerator operation amount and a signal based on an operation of a shift operation member. The deceleration correction unit corrects the target vehicle speed based on the inching operation amount.
    Type: Grant
    Filed: April 2, 2020
    Date of Patent: May 21, 2024
    Assignee: KOMATSU LTD.
    Inventor: Takahisa Oasa
  • Publication number: 20240159018
    Abstract: A work machine includes a body, a work implement, and a controller. The body includes a frame to which the work implement is attached, an operator's cab, and a plurality of liquid-sealed mounts that are installed at different positions of the frame and support the operator's cab. At least one of the plurality of liquid-sealed mounts includes a sensor that detects a liquid pressure of a sealed liquid. The controller calculates an inclination degree of the work machine with respect to a horizontal plane based on a result of the detection by the sensor.
    Type: Application
    Filed: February 2, 2022
    Publication date: May 16, 2024
    Applicant: KOMATSU LTD.
    Inventor: Kazumichi OKAJIMA
  • Publication number: 20240159024
    Abstract: A failure of a component mounted on a work machine is easily identified. A controller acquires time-series data detected in a first period as first snapshot data, and acquires the time-series data detected in a second period after the first period as second snapshot data. A storage unit stores information in which a deviation of a physical quantity from a normal range in order to monitor an operation status of the component, and a failure of the component that is a cause of the deviation are associated with each other. The controller identifies the failure of the component based on the first snapshot data, the second snapshot data, and the information stored in the storage unit.
    Type: Application
    Filed: January 24, 2022
    Publication date: May 16, 2024
    Applicant: KOMATSU LTD.
    Inventors: Toshimasa KANDA, Masayoshi SHIWAKU, Yasuhiro KOBIKI, Ryosuke WAKIYA
  • Publication number: 20240159022
    Abstract: A boom is attached to a machine main body. A bucket is attached to the boom. A boom cylinder is attached to the machine main body and drives the boom. A bucket cylinder is attached to the machine main body and drives the bucket with respect to the boom. A controller calculates a mass of a load within the bucket based on boom cylinder force and bucket cylinder force.
    Type: Application
    Filed: December 2, 2020
    Publication date: May 16, 2024
    Applicant: KOMATSU LTD.
    Inventor: Shota YAMAWAKI
  • Publication number: 20240151001
    Abstract: A steering mechanism is used to navigate the direction of travel of a motor grader. A directional correction input device is manipulatable by an operator. A controller, during automatic control of the steering operation by the steering mechanism, controls the steering mechanism in a manner that the direction of travel is adjustable leftward or rightward through a certain angle based on an operation command inputted through the directional correction input device.
    Type: Application
    Filed: January 19, 2022
    Publication date: May 9, 2024
    Applicant: KOMATSU LTD.
    Inventors: Takuya SONODA, Takashi MAEDA, Yoshihide NAKAE, Youichirou KIMURA
  • Publication number: 20240149963
    Abstract: A wear resistant component includes a matrix portion made of metal, a core embedded in the matrix portion and having a hardness higher than that of the matrix portion, and a plurality of support members having at least one end exposed from a surface of the matrix portion, extending toward an interior of the matrix portion, and contacting the core at a portion other than the one end to define a position of the core within the matrix portion.
    Type: Application
    Filed: February 25, 2022
    Publication date: May 9, 2024
    Applicant: KOMATSU LTD.
    Inventors: Masayuki OHISHI, Masaharu AMANO, Minoru KATAYAMA
  • Publication number: 20240151008
    Abstract: A running wheel is attached to a machine main body. A boom is attached to the machine main body. A bucket is attached to the boom. A boom cylinder is attached to the machine main body and drives the boom. A controller calculates a mass of a load within the bucket based on boom cylinder force of the boom cylinder and a ground acceleration of a wheel loader.
    Type: Application
    Filed: December 2, 2020
    Publication date: May 9, 2024
    Applicant: KOMATSU LTD.
    Inventors: Shota YAMAWAKI, Yuita TAKENAKA
  • Publication number: 20240150993
    Abstract: An arm cylinder bracket (7a) is connected to a lower plate (BP). An inner rib (21) is disposed inside an arm (7) and connected to the lower plate (BP) within a connection range (RA) between the lower plate (BP) and the arm cylinder bracket (7a) in a side view.
    Type: Application
    Filed: February 24, 2022
    Publication date: May 9, 2024
    Applicant: KOMATSU LTD.
    Inventors: Atsushi TSUNEKAWA, Ahmad ISKANDAR, Takuya IZAKI, Akinobu IWASAKI
  • Patent number: 11976438
    Abstract: A loading machine includes a swing body and work equipment attached to the swing body. The work equipment has a bucket. A control device of the loading machine includes an operation signal input unit that receives an input of a loading command signal from an operator, and an operation signal output unit. The operation signal output unit outputs operation signals of the work equipment and the swing body to move the bucket to a loading position above a loading target in a case in which the loading command signal is received. The operation signal output unit outputs a dumping operation signal to perform dumping to the bucket when the swing body faces a dump start azimuth direction that is closer to the swing body in a swing direction than an end point azimuth direction in which the swing body faces when the work equipment is positioned at the loading position.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: May 7, 2024
    Assignee: KOMATSU LTD.
    Inventors: Tomoki Konda, Kazuhiro Hatake
  • Publication number: 20240142262
    Abstract: An operation management system including a controller configured to execute: a position obtaining process to obtain positional information from each registered mobility; a correlating process to correlate each registered mobility and specification information stored in a storage device with each other; a travel-history storing process to store, in the storage device, a traveled route which is a travel history of each registered mobility, so as to be correlated with map information; and a road-surface-condition obtaining process to calculate a road surface condition including a position and a shape of a rut corresponding to the traveled route based on information on a detection value of a sensor of each of registered mobility, the type of a road surface included in the map information, the specification information, and the traveled route and to store, in the storage device, the road surface condition so as to be correlated with the map information.
    Type: Application
    Filed: October 26, 2023
    Publication date: May 2, 2024
    Applicants: Toyota Jidosha Kabushiki Kaisha, Komatsu Ltd.
    Inventors: Yusuke NOZAWA, Shun Mizoo, Toru Takashima, Takahiro Okano, Kenta Osagawa, Takashi Hiranaka, Shota Konishi
  • Publication number: 20240141621
    Abstract: One aspect of the present disclosure is a display control device, and the display control device includes: an overhead image-generating unit that generates an overhead image of a work machine including an undercarriage and an upper swiveling body swivelably supported by the undercarriage based on one or a plurality of captured images imaged by one or a plurality of imaging devices provided in the upper swiveling body; a superimposing unit that generates a display image in which an attention area image indicating a swiveling attention area accompanying swiveling of the upper swiveling body and a traveling attention area accompanying forward and backward movement of the undercarriage is superimposed on the overhead image; and a display image-outputting unit that outputs the display image.
    Type: Application
    Filed: April 27, 2022
    Publication date: May 2, 2024
    Applicant: Komatsu Ltd.
    Inventors: Taro Eguchi, Koichi Nakazawa
  • Publication number: 20240141814
    Abstract: There is provided a control device that controls an injection amount of a reducing agent to be supplied to a selective reduction catalyst provided in an exhaust passage of an internal combustion engine. The control device includes a pre-correction injection amount calculation unit configured to calculate a pre-correction injection amount of the reducing agent based on an operating state of the engine, and an injection amount correction unit configured to calculate a corrected injection amount obtained by correcting the pre-correction injection amount, based on a rate of change over time of a rotation speed of the engine and a rate of change over time of a fuel injection amount of the engine, such that the injection amount of the reducing agent increases when at least both the rate of change over time of the rotation speed and the rate of change over time of the fuel injection amount are positive.
    Type: Application
    Filed: March 7, 2022
    Publication date: May 2, 2024
    Applicant: Komatsu Ltd.
    Inventor: Yoshitoshi Nagado
  • Publication number: 20240141625
    Abstract: An abnormality determination system applicable to a work machine includes: a stereo camera 22 mounted on a wheel loader having working equipment 10; a position data calculation unit 83 that estimates a position of the working equipment 10 in a captured image of the stereo camera 22 based on a posture of the working equipment 10 when captured by the stereo camera 22; and a determination unit 91 that determines whether the stereo camera 22 is normal based on the estimated position of the working equipment 10.
    Type: Application
    Filed: March 14, 2022
    Publication date: May 2, 2024
    Applicants: Komatsu Ltd., Komatsu Ltd.
    Inventors: Yohei Seki, Koji Kusaka, Yuki Hosoda
  • Publication number: 20240144744
    Abstract: An aspect of the present invention relates to a control device for an exhaust gas post-treatment device that includes a filter that collects a particulate substance in exhaust gas of an engine and an oxidation catalyst provided upstream of the filter, and that is configured to regenerate the filter by an action of the oxidation catalyst, the control device including a notification unit configured to, in a case in which forced regeneration for forcibly increasing a temperature of the exhaust gas is carried out, when the number of times it is estimated that the temperature of the exhaust gas is lower than a light-off temperature for a period of time equal to or longer than a prescribed period of time exceeds a prescribed threshold, issue a notification indicating that there is a problem in an operation state of the engine.
    Type: Application
    Filed: March 4, 2022
    Publication date: May 2, 2024
    Applicant: Komatsu Ltd.
    Inventors: Yoshitoshi Nagado, Shinichi Saitou, Toshio Kanda
  • Patent number: 11970834
    Abstract: The invention includes a vehicle main body, a boom, a first actuator connecting the boom and the vehicle main body and configured to rotate the boom with respect to the vehicle main body about a first central axis, a first electric motor connected to the first actuator and that operates the first actuator. The boom includes a pair of boom lateral plates disposed to face each other in a direction of the first central axis, and a boom bottom plate connecting the boom lateral plates to each other, the first electric motor being disposed in a boom internal space surrounded by the pair of boom lateral plates and the boom bottom plate.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: April 30, 2024
    Assignee: Komatsu Ltd.
    Inventors: Ryo Ishikawa, Kazuhiro Kurihara, Takeshi Endou
  • Patent number: 11971098
    Abstract: A power transmission device includes a torque converter device, a first hydraulic pump, a first oil channel, a second oil channel, a third oil channel, a second pressure control valve, and a controller. The torque converter device has a torque converter and a lock-up clutch. The first oil channel supplies hydraulic fluid from the first hydraulic pump to the torque converter. The second oil channel drains hydraulic fluid from the torque converter. The third oil channel communicates with the first oil channel and the second oil channel. The second pressure control valve is disposed in the third oil channel. The controller sets the second pressure control valve to an open state when the lock-up clutch is in an engaged state.
    Type: Grant
    Filed: January 18, 2021
    Date of Patent: April 30, 2024
    Assignee: KOMATSU LTD.
    Inventors: Hironori Torisu, Takuro Yoneda, Tetsuya Yamauchi
  • Patent number: 11971724
    Abstract: An unmanned vehicle control system includes: a determination unit that determines whether or not to output a heating request for a hydraulic oil based on hydraulic oil data supplied to a hydraulic actuator disposed in an unmanned vehicle and operated by the hydraulic oil; a vehicle receiver that receives a heating command for the hydraulic oil generated based on the heating request; and a heating processor that executes a heating process of the hydraulic oil based on the heating command.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: April 30, 2024
    Assignee: Komatsu Ltd.
    Inventors: Masanori Ogihara, Misato Maeda, Katsuki Awamori
  • Publication number: 20240134395
    Abstract: A management system of a work site includes: a workplace data acquisition unit that acquires workplace data set in a workplace where an unmanned haul vehicle travels; and a sprinkling area setting unit that sets, on the basis of the workplace data, a sprinkling area on which the unmanned sprinkler vehicle sprinkles water in the workplace.
    Type: Application
    Filed: January 20, 2022
    Publication date: April 25, 2024
    Applicant: Komatsu Ltd.
    Inventors: Misato Maeda, Takashi Hiranaka, Kenta Osagawa
  • Publication number: 20240133160
    Abstract: An activation system of a work machine includes a vehicle body control unit outputting a control signal to drive a vehicle body of the work machine with power supplied by a power source, and an authentication unit performing authentication of an operator of the work machine. The activation system of a work machine first activates the authentication unit, and activates the vehicle body control unit when the authentication unit authenticates that the operator boarding the work machine is a specific operator.
    Type: Application
    Filed: March 14, 2022
    Publication date: April 25, 2024
    Applicant: Komatsu Ltd.
    Inventors: Tomofumi Hokari, Yuichiro Yasuda, Kenji Nozaki, Kosuke Iwata