Komatsu Corporation

Satoru Shintani

Tomohiro Nakagawa

Yoshito Kumakura

Daiki Arimatsu

Ryouichi Nagasaka

Shigeru Yamamoto

Masashi Ichihara

Yoshiki Kami

Masanobu Seki

Eiji Ishibashi

Kenjiro Shimada

Masato Kageyama

Yuki Shimano

Kazuki Kure

Takeshi Takaura

Yuto Fujii

Hiroshi Nakagami

Kazuyuki Suzuki

Kenji Ohiwa

Tsutomu Iwamura

Ryohei Hasegawa

Yukihiro Sakuda

Hironori Toda

A type information input unit receives an input of type information for identifying an attachment. A storage unit stores in advance correspondence between the type information and a weight or weight classification of the attachment. A specification unit specifies a corresponding weight or weight classification based on the type information input to the type information input unit.

Control device and control method

A control line determinator determines whether or not a work state of a work implement is a predetermined work state. A display controller generates a display signal including a target surface of a construction object or a control line indicating a surface which is different from the target surface and which a bucket is to be prevented from entering. The display controller makes a display form of the control line or the target surface in the display signal different according to whether or not the work state is the predetermined work state.

Display control device and method for generating target line or control line of work machine

A display system for an excavation machine includes a calculator configured to calculate, based on vehicle state data indicating a position and a posture of a vehicle body of an excavation machine, working equipment outer shape data indicating an outer shape and a dimension of working equipment supported by the vehicle body, and working equipment state data indicating a posture of the working equipment, a reference vector extending in a widthwise direction of a bucket of the working equipment and passing through a specified portion of the bucket, and a display controller configured to cause a display device to display the bucket and a target line viewed from a direction orthogonal to the reference vector.

Display system for excavation machine, excavation machine, and display method for excavation machine

When correcting an error caused by deviation of an attitude detection device with respect to a work machine including a swing body which swings, a working implement being attached to the swing body, the attitude detection device outputting an attitude of the work machine, the error is corrected by using a first position which is a position of a part of the work machine when the work machine is in a first attitude and a second position which is a position of the part when the work machine is in a second attitude.

Calibration device of work machine, work machine, and calibration method of work machine

A display system of a working machine includes: a tilt sensor that detects a pitch angle and a roll angle of a working machine; a calculation unit that calculates a tilting position on polar coordinates that indicates a magnitude and a direction of tilt of the working machine based on the detected pitch angle and roll angle; a display unit that displays various kinds of information; a display processing unit that displays, on a predetermined region on a display screen of the display unit, a monitor-displayed level that performs a polar coordinate display of the tilting position and a marked line indicating a preset magnitude of tilt; and a setting processing unit that performs a setting to change display content of the monitor-displayed level.

Display system of working machine and working machine

A construction information display device configured to display construction information includes: a display unit configured to display at least a partial distribution map indicating a current landform and a design landform; an input unit through which a target surface is selected from the design landform; and a display processing unit configured to, when the target surface is selected through the input unit, display a range of the selected target surface while visibly displaying the partial distribution map within the selected target surface.

Construction information display device and method for displaying construction information

A work vehicle includes a vehicular body, a work implement, an angle sensor, and a work implement control unit. A bucket is rotatable with respect to an arm around a bucket axis in parallel to an arm axis and a tilt axis orthogonal to a bucket axis. The angle sensor is provided in the bucket and detects an angle of inclination of the bucket with respect to a horizontal plane. The work implement control unit starts control of the work implement in which an operation of the work implement is controlled at least partially automatically when an angle of inclination of the bucket detected by the angle sensor is smaller than a first threshold value, and does not start control of the work implement when an angle of inclination of the bucket detected by the angle sensor is equal to or greater than the first threshold value.

Work vehicle and method of controlling work vehicle

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.

Hydraulic excavator and method for measuring stroke of hydraulic cylinder of hydraulic excavator

A work vehicle is provided with an engine, a traveling device driven by driving force from the engine to cause the work vehicle to travel, a first hydraulic pump driven by the driving force from the engine to discharge hydraulic oil, and a cooling device having a cooling fan driven by the hydraulic oil supplied by the first hydraulic pump to cool the engine, and a control unit. The control unit performs a normal cooling control in which an upper limit fan speed is determined based on an engine speed, and a cooling suppression control in which the upper limit fan speed determined based on the engine speed is suppressed to be less than the upper limit fan speed during the normal cooling control when a predetermined operation required to increase the engine speed is performed.

Work vehicle and control method for work vehicle

A method for driving a ripper is provided in which the movement of a ripper attached to the rear of the body of a bulldozer is controlled. The method includes a first step in which the ripper is operated while the bulldozer is moving forward or is stopped, a second step in which the bulldozer is reversed and the ripper is raised, and a third step in which the ripper is automatically raised.

Control method for driving a ripper

A controller of a work vehicle sets the upper limit of a fan target rotational speed in accordance with an engine rotational speed. The controller reduces an upper limit of the fan target rotational speed further when a lock-up clutch is in an engaged state than when the lock-up clutch is in a released state.

Work vehicle and method for controlling work vehicle

A bulldozer includes a body, a drive unit, a ripper, an operating lever, a steering lever, and a controller. The ripper is attached to a rear part of the body and performs ripping work. The operating lever is for operating the ripper. The steering lever is for controlling a travel operation by the drive unit. The controller executes a first control of pulling the ripper up out of the ground and a second control of tilting back the ripper, when it is detected that the ripping work has been ended by operation of the operating lever and the steering lever.

Bulldozer including controller that performs automatic control of ripper

A control device for automatically controlling a pitch angle of a blade includes a hydraulic oil amount calculation unit and an open ratio setting unit. The hydraulic oil amount calculation unit is configured to calculate an amount of hydraulic oil passing through a blade tilt cylinder valve. The open ratio setting unit is configured to cause the blade tilt cylinder valve to open at a predetermined open ratio when a request for the pitch angle to be changed has been received, to cause the blade tilt cylinder valve to close when the calculated amount of hydraulic oil has reached a predetermined amount of hydraulic oil required for the change of the tilt angle, and to cause the open ratio to be smaller than the predetermined open ratio while a request for a predetermined action necessitating that hydraulic oil be supplied from a main valve is being received.

Control device and pitch angle control method

A tankand a main hydraulic pumpare connected to head side actuator chambersand rod side actuator chambersof hydraulic actuatorsvia conduits. A direction control valveand a quick drop valveare connected to the conduits. A hydraulic circuit is provided with an electromagnetic switch valve, which switches the quick drop valvefrom a non-quick drop positionto a quick drop position. When switching the direction control valvefrom a neutral positionto a lowering operation position, if the manipulation speed of a manipulation leverexceeds a criteria speed, an excitation signal is output from a control deviceto an electromagnetic switch valveto quickly drop a blade, and the quick drop valveis switched from the non-quick drop positionto the quick drop position

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Hirakata, Japan

Satoru Shintani