Patents Assigned to Komatsu Ltd.
  • Patent number: 10935660
    Abstract: A control system is provided with a position detection device which detects a position of a work machine, a contactless sensor which detects an object around the work machine in a contactless manner, a position calculation unit which calculates a position of the work machine on the basis of at least map data indicating a position of the object and detection data of the contactless sensor, and a diagnosis unit which compares the position of the work machine derived from detection data of the position detection device and the position of the work machine calculated by the position calculation unit and diagnoses that there is an abnormality in either the detection data of the position detection device or a calculation result of the position calculation unit.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: March 2, 2021
    Assignee: KOMATSU LTD.
    Inventors: Atsushi Sakai, Masanori Tojima
  • Patent number: 10934685
    Abstract: A power transmission device of a work vehicle includes a motor control unit that controls first and second motors to keep the transmission speed ratio at a maximum value when a vehicle speed is greater than a second vehicle speed where the transmission speed ratio reaches the maximum value obtainable by the power transmission device, and less than a third vehicle speed where a rotation speed of the second motor reaches a predetermined limit value. A controller increases a rotation speed of an engine from a second rotation speed of the engine when the vehicle speed is greater than the second vehicle speed and less than a third vehicle speed, and increases the rotation speed of the engine from a third rotation speed of the engine when the vehicle speed is greater than the third vehicle speed.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: March 2, 2021
    Assignee: KOMATSU LTD.
    Inventors: Shunsuke Miyamoto, Masao Yoshizawa, Yasuo Fujiwara
  • Patent number: 10927525
    Abstract: A work vehicle control system includes an actual topography acquisition device, a storage device, and a controller. The actual topography acquisition device acquires actual topography information, which indicates the actual topography of a work target. The storage device stores design topography information, which indicates a final design topography that is a target topography of the work target. The controller acquires the actual topography information from the actual topography acquisition device. The controller acquires the design topography information from the storage device. The controller generates a command signal to move the work implement to a position that is between the actual topography and the final design topography, and a predetermined distance above the actual topography.
    Type: Grant
    Filed: July 25, 2017
    Date of Patent: February 23, 2021
    Assignee: KOMATSU LTD.
    Inventors: Eiji Ishibashi, Akifumi Inamaru, Yasuhito Yonezawa, Takahiro Shimojo
  • Patent number: 10927527
    Abstract: A surroundings monitoring device of a crawler-type work machine includes: cameras configured to take images of surroundings of the crawler-type work machine; a display unit configured to display the images taken by the cameras; and a controller configured to superimpose an outer-edge guide image generated based on the farthest position of an undercarriage from a revolution center of the crawler-type work machine on the display unit.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: February 23, 2021
    Assignee: Komatsu Ltd.
    Inventors: Masaomi Machida, Takeshi Kurihara
  • Patent number: 10920648
    Abstract: A determination method is for an exhaust gas treatment device mounted in a work machine and having at least one of a diesel oxidation catalyst and a catalyzed soot filter. The determination method includes acquiring heat damage information, acquiring cumulative heat damage information, and determining a usability of the exhaust gas treatment device based on the cumulative heat damage information. The heat damage information indicates an extent of heat damage of the exhaust gas treatment device based on a unique identification symbol of the exhaust gas treatment device. The cumulative heat damage information is acquired by accumulating the heat damage information.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: February 16, 2021
    Assignee: KOMATSU LTD.
    Inventors: Yuuta Sakurai, Tatsushi Itou, Yuuki Kasaoka, Tetsuo Ohnishi, Yu Ninomiya
  • Patent number: 10920399
    Abstract: A work vehicle includes an engine, a hydrostatic transmission, and a controller. The hydrostatic transmission includes a traveling pump driven by the engine, a hydraulic circuit connected to the traveling pump, and a traveling motor connected to the traveling pump via the hydraulic circuit. The controller is configured to control the traveling motor and the traveling pump, determine a target flow rate of the traveling motor or the traveling pump, determine a correction amount of the target flow rate from a hydraulic pressure of the hydraulic circuit, and determine a target displacement of the traveling motor or the traveling pump from the target flow rate and the correction amount.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: February 16, 2021
    Assignee: KOMATSU LTD.
    Inventor: Takahisa Oasa
  • Patent number: 10920797
    Abstract: A hydraulic circuit includes: a direction switching valve, which is in a state where a bottom oil path is connected to a first tank oil path and where a bypass oil path is connected to a second tank oil path when a pump oil path is connected to a rod oil path and when the rod oil path is connected to the bypass oil path when the pump oil path is connected to the bottom oil path, and a pilot operation control valve which allows flows of oil in both directions between the direction switching valve and the bottom oil path when the pump oil path is connected to the rod oil path and allows only a flow of oil from the direction switching valve to the bottom oil path when the pump oil path is connected to the bottom oil path by the direction switching valve.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: February 16, 2021
    Assignee: Komatsu Ltd.
    Inventors: Yuusuke Miyamoto, Yuichi Hishinuma
  • Publication number: 20210040711
    Abstract: A control device for a loading machine includes a measurement data acquisition unit that acquires measurement data of a measurement device mounted on the loading machine that includes working equipment, a target calculation unit that extracts, from the measurement data, loading target data being measurement data on a loading target on which excavated material excavated by the working equipment is loaded and calculates, based on the loading target data, height data indicating a height of an upper end portion of the loading target and distance data indicating a distance from the loading machine to the loading target, and a working equipment control unit that controls the working equipment based on the height data and the distance data.
    Type: Application
    Filed: March 11, 2019
    Publication date: February 11, 2021
    Applicant: Komatsu Ltd.
    Inventors: Yohei Seki, Masataka Ozaki
  • Publication number: 20210032737
    Abstract: A machine component includes a core made up of a steel for machine structural use, and a medium carbon-containing layer and a high carbon-containing layer formed of the steel for machine structural use, the medium carbon-containing layer covering the core, the high carbon-containing layer covering the medium carbon-containing layer and having a carbon concentration of 0.8-1.5%. The high carbon-containing layer is made up of a martensitic structure having carbides dispersed therein and a residual austenitic structure, wherein spheroidized carbides with an aspect ratio of 1.5 or less constitute 90% or more of a total number of the carbides, and the number of spheroidized carbides on prior austenite grain boundaries is 40% or less of the total number of the carbides.
    Type: Application
    Filed: May 10, 2019
    Publication date: February 4, 2021
    Applicant: KOMATSU LTD.
    Inventors: Kensuke SATO, Koji YAMAMOTO, Yusuke HIRATSUKA, Kazuya HASHIMOTO
  • Publication number: 20210032716
    Abstract: A method for producing a machine component excellent in pitting resistance characteristics and toughness includes a carburizing step, performed on a steel material containing 0.13-0.30% C and 0.90-2.00% Cr in mass % and at least one of Si, Mn, Ni, Mo, Nb, V, Ti, B, Al, and N, balance Fe and unavoidable impurities; heating the material to 850-1030° C. to attain carbon concentration in a surface of 0.8-1.5%; cooling the material at an average rate of 5° C./sec or lower from a temperature higher than the Acm point of a surface layer to a cooling end temperature that is at least 50° C. lower than the A1 point to cause the surface layer to have a pearlite or bainite structure with dispersion; spheroidizing annealing at a temperature not higher than the Acm point at the surface layer; heating the material to not higher than the Acm point at the surface layer; and performing tempering.
    Type: Application
    Filed: May 10, 2019
    Publication date: February 4, 2021
    Applicant: KOMATSU LTD.
    Inventors: Kensuke SATO, Koji YAMAMOTO, Yusuke HIRATSUKA, Kazuya HASHIMOTO
  • Publication number: 20210032841
    Abstract: A blade control method includes: acquiring a design surface indicating a target shape of an excavation object to be excavated by a blade supported by a vehicle body of a work vehicle, the design surface including a first surface present in front of the work vehicle and a second surface having a slope different from a slope of the first surface; acquiring an observed pitch angle indicating an inclination angle of the vehicle body in a longitudinal direction; and calculating a planned pitching angle indicating a deviation between the observed pitch angle and a design surface pitch angle indicating an inclination angle of the second surface in a state in which the vehicle body is positioned on the first surface and the blade is positioned above the second surface.
    Type: Application
    Filed: January 28, 2019
    Publication date: February 4, 2021
    Applicant: Komatsu Ltd.
    Inventors: Takao Ishihara, Daichi Noborio, Yutaka Nakayama
  • Publication number: 20210032849
    Abstract: The invention refers to a hydraulic control system for controlling operation of a work attachment of a work machine, comprising a controller configured to output a work attachment control value controlling the operation of the work attachment, an operator input device configured to output a command signal depending on the amount of actuation of the operator input device for setting the work attachment control value, a save input device configured to generate a save command signal upon actuating the save input device and a mode select input device configured to select a first mode and a second mode, wherein the controller is configured to save a constant work attachment control value, wherein the constant work attachment control value is the work attachment control value as set by the command signal upon receiving the save command signal.
    Type: Application
    Filed: March 12, 2019
    Publication date: February 4, 2021
    Applicant: KOMATSU LTD.
    Inventors: Carlo STRUSS, Christian HAHN
  • Publication number: 20210032837
    Abstract: A wheel loader includes: a front frame; a bucket; a boom having a distal end connected to bucket, and a proximal end rotatably supported by front frame; a sensor configured to measure a distance between boom and a loading target; and a controller configured to control an action of wheel loader. The controller causes wheel loader to perform a predetermined action for collision avoidance on condition that a distance to be measured by sensor when wheel loader travels takes a value less than or equal to a threshold value.
    Type: Application
    Filed: September 17, 2020
    Publication date: February 4, 2021
    Applicant: KOMATSU LTD.
    Inventor: Toru NAITO
  • Publication number: 20210032846
    Abstract: A work analysis device includes a state data acquisition unit state, a work specification unit, and an output unit. The data acquisition unit acquires state data indicating a state of a work machine. The work specification unit specifies, based on the acquired state data, a classification of work of the work machine for each of the multiple times, and collects the classification of work in a chronological order. The output unit outputs a time series of the specified classification of work.
    Type: Application
    Filed: March 13, 2019
    Publication date: February 4, 2021
    Applicant: KomaTsu Ltd.
    Inventors: Shintaro HAMADA, Minami SUGIMURA
  • Patent number: 10906747
    Abstract: A conveyance system includes a conveyance device including a first conveyance mechanism configured to convey freight supplied from a loader, and a second conveyance mechanism configured to convey the freight supplied from the first conveyance mechanism, a weight detection device configured to detect weight of the freight loaded on the second conveyance mechanism, and a control apparatus. The control apparatus includes a first conveyance control unit configured to control the first conveyance mechanism. The first conveyance control unit controls the first conveyance mechanism based on a detection value of the weight detection device.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: February 2, 2021
    Assignee: Komatsu Ltd.
    Inventors: Yasuaki Aga, Kazuhiko Iwata, Yuichi Kodama, Masaaki Uetake
  • Patent number: 10906126
    Abstract: The method includes a step of preparing a first member made of a first metal and a second member made of a second metal having a smaller deformation resistance than the first metal, and a step of joining the first member and the second member. The step of joining includes a step of disposing the second member in a cavity of a mold, a step of heating the first member and the second member by relatively rotating the first member with respect to the second member, while pressing the first member against the second member, without changing a positional relationship, and a step of cooling the first member and the second member with the members being in contact with each other. In the step of disposing, the second member is disposed such that a second member contact surface is surrounded by the sidewall of the cavity.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: February 2, 2021
    Assignee: KOMATSU LTD.
    Inventors: Toshikazu Matsuyama, Masaharu Amano, Yoshitaka Shibata
  • Patent number: 10907325
    Abstract: A work vehicle control system includes an actual topography acquisition device, a storage device, and a controller. The actual topography acquisition device acquires actual topography information, which indicates an actual topography of a work target. The storage device stores design topography information, which indicates a final design topography that is a target topography of the work target. The controller acquires the actual topography information from the actual topography acquisition device. The controller acquires the design topography information from the storage device. When the actual topography positioned below the final design topography is sloped, the controller generates a command signal to move the work implement along a locus positioned below the final design topography and below the actual topography, and a sloped locus that is positioned below the final design topography and above the actual topography.
    Type: Grant
    Filed: July 25, 2017
    Date of Patent: February 2, 2021
    Assignee: KOMATSU LTD.
    Inventors: Eiji Ishibashi, Akifumi Inamaru, Kenji Yamamoto, Yasuhito Yonezawa, Yosuke Kogawa
  • Publication number: 20210025141
    Abstract: A work analysis device includes a state data acquisition unit state and a work specification unit. The data acquisition unit is configured to acquire state data indicating a state of a work machine. The work specification unit is configured to, based on the acquired state data, specify a classification of a unit work that indicates work carrying out one work goal for the work machine, and specify a classification of an element work. The element work constitutes the unit work, and indicates a series of actions or work classified by purpose.
    Type: Application
    Filed: March 12, 2019
    Publication date: January 28, 2021
    Applicant: Komatsu Ltd.
    Inventors: Shintaro HAMADA, Minami SUGIMURA
  • Publication number: 20210025142
    Abstract: A work vehicle includes a work implement. A control system for the work vehicle includes a controller. The controller determines a target design terrain indicating a target trajectory of the work implement, and operates the work implement to dump materials on a current terrain sequentially from a nearer side to a farther side of the work vehicle in accordance with the target design terrain. At least a part of the target design terrain is located above the current terrain.
    Type: Application
    Filed: January 17, 2019
    Publication date: January 28, 2021
    Applicant: KomaTsu Ltd.
    Inventors: Yukihisa TAKAOKA, Kazuki KURE
  • Publication number: 20210025130
    Abstract: Provided are a cab for a work machine and a work machine capable of preventing a door from opening against an operator's intention. The cab includes a cab body, a door, and a gas spring. The cab body is formed with a doorway. The door is rotatably supported on the cab body. The door opens and closes the doorway. The gas spring biases the door in the closing direction.
    Type: Application
    Filed: March 12, 2019
    Publication date: January 28, 2021
    Applicant: KOMATSU LTD.
    Inventor: Yasunari KATO