Komatsu Corporation

Kmoatsu Ltd.

Katsuhiro Ikegami

Satoru Koyanagi

Yoshiki Kami

Yuki Shimano

Toru Nakayama

Yukio Tamura

Akinori Baba

Yuji Ozawa

Tooru Nakayama

Hayato Matsumoto

Masashi Ichihara

Takeshi Takaura

Masanobu Seki

Tsutomu Iwamura

Yasuhiro Kamoshida

Masaho Yamaguchi

Motoki Kurohara

Kazuhiro Yoshida

Hiroshi Yoshida

Masaaki Imaizumi

Yuto Fujii

Yukio Moriya

Daiki Arimatsu

Yoshitaka Onodera

Toshio Kitani

Yasutaka Nishida

Kazuyuki Yamazaki

Mitsunobu Yamada

Taneaki Fujino

Yasuhiro Yoshida

Haruki Nishiguchi

Yukinori Maeda

Kazuki Takehara

Hayato Hisa

Yoshimitsu Yuzawa

Satoshi Ito

Atsushi Mura

Hiromu Dambayashi

Akihiko Teramura

Yosahitaka Onodera

Teruo Nakahara

Mikihisa Takiguchi

A work machine capable of saving works by an operator during traveling is provided. The work machine includes a vehicular main body including a traveling unit, a work implement attached to the vehicular main body, and a controller that automatically controls operations by the work implement. The controller cancels automatic control of operations by the work implement based on a traveling state of the traveling unit.

Work machine, system including work machine, and method of controlling work machine

A work machine includes: first working equipment with first working equipment parameter; second working equipment including a parallel link and being attachable to the first working equipment; a swing angle detector that detects swing angle information of the first working equipment; an attitude calculating unit that calculates an attitude of the first working equipment based on the detected swing angle information of the first working equipment; a working equipment parameter storage that stores the first working equipment parameter defined for a component of the first working equipment; a correction information acquiring unit that acquires information on the second working equipment as correction information; and a working equipment parameter correction unit that corrects the first working equipment parameter based on the correction information on the second working equipment acquired by the correction information acquiring unit.

Work machine and correction method of working equipment parameter for work machine

The present invention includes a stroke sensor which is arranged on a hydraulic cylinder and measures a stroke length of the hydraulic cylinder; a rotary encoder and a magnetic force sensor which measure a reset reference point to reset a value of the stroke length measured by the stroke sensor; a stroke end detection processing unit which detects a stroke end position of the hydraulic cylinder; a calibration processing unit which calibrates the measured value of the stroke length when the reset reference point and/or the stroke end position is detected; an HMI monitor which displays an entire work machine mounted with the hydraulic cylinder when an initial calibration work for the hydraulic cylinder is carried out; and a highlight display processing unit that highlights a moving portion to drive a hydraulic cylinder to be calibrated along with an indication of a driving direction.

Apparatus and method for assisting hydraulic cylinder stroke initial calibration work

A construction machine control system for a construction machine that includes a work machine including a boom, an arm, and a bucket includes: an adjusting device having a movable spool and being capable of adjusting an amount of operating oil supplied to a hydraulic cylinder that drives the work machine with movement of the spool; an operation command unit adjusting the spool; a storage unit storing a plurality of pieces of correlation data indicating a relation between a cylinder speed of the hydraulic cylinder and an operation command value of operating the hydraulic cylinder according to a type of the bucket; an acquiring unit acquiring type data indicating the type of the bucket; and a control unit selecting one piece of correlation data from the plurality of pieces of correlation data based on the type data and controlling the operation command value based on the selected correlation data.

Construction machine control system, construction machine, and construction machine control method

A hydraulic excavator is provided with a tilt cylinder disposition data creating unit and a bucket information computing unit. The tilt cylinder disposition data creating unit creates tilt cylinder disposition data which indicates that a disposition of a tilt cylinder is either a first disposition in which a bucket is rotated in the clockwise direction due to extension or a second disposition in which the bucket is rotated in the clockwise direction due to contraction, when viewing the bucket from a vehicle body side. The bucket information computing unit obtains a tilt angle of the bucket based on the stroke length on the basis of the tilt cylinder disposition data.

Work vehicle and method for obtaining tilt angle

A control system includes: a data acquisition unit that acquires an operation command value and data on a cylinder speed in a state where an operation command of operating a hydraulic cylinder is output; a deriving unit that derives an operation start operation command value when the hydraulic cylinder in a stopped state starts operating and slow-speed operation characteristics indicating a relation between the operation command value and the cylinder speed in a slow-speed area based on the data acquired by the data acquisition unit; a storage unit that stores the operation start operation command value and the slow-speed operation characteristics derived by the deriving unit; and a work machine control unit that controls a work machine based on information stored in the storage unit.

A control system includes: a first pressure sensor disposed in a pilot oil passage between an operating device and a control valve and detecting pressure of pilot oil; a second pressure sensor disposed in the pilot oil passage between the control valve and a direction control valve and detecting the pressure of the pilot oil; a control valve controller controlling the control valve; a data acquisition unit acquiring data on a detection value of the first pressure sensor and a detection value of the second pressure sensor in a state where the pilot oil passage is opened by the control valve; and a correction unit correcting the detection value of the first pressure sensor or the second pressure sensor based on the data acquired by the data acquisition unit so that the detection value of the first pressure sensor is identical to the detection value of the second pressure sensor.

A stroke operation calibration control device for a hydraulic cylinder includes: movable portions; hydraulic cylinders; a stroke sensor measuring a stroke length of the hydraulic cylinder; a reset sensor measuring a reset reference point at which a measurement value of the stroke length obtained by the stroke sensor is reset; a stroke end detection process unit detecting a stroke end position of the hydraulic cylinder; a calibration process unit calibrating the measurement value of the stroke length upon the detection of the reset reference point and/or the stroke end position; a malfunction detection unit outputting an error when the stroke length is in the predetermined measurement range; and a control unit prohibiting the reset until the stroke length has passed the reset reference point at power input time.

Stroke operation calibration control device for hydraulic cylinder and stroke operation calibration control method for hydraulic cylinder

A control system includes: a control valve control unit that controls a control valve; a data acquisition unit that acquires data on an operation command value and a cylinder speed in a state where an operation command for operating a hydraulic cylinder is output; and a deriving unit that derives operation characteristics in an operation direction of each of a plurality of hydraulic cylinders in relation to the operation command value based on the data acquired by the data acquisition unit. In acquisition of the data by the data acquisition unit, the control valve control unit controls a control valve of one pilot oil passage that is an acquisition object where the data is acquired among the plurality of pilot oil passages to open one pilot oil passage and controls control valves of the other pilot oil passages to close the other pilot oil passages.

A stroke operation diagnosis supporting device for a hydraulic cylinder includes: movable portions; hydraulic cylinders; a stroke sensor measuring a stroke length of the hydraulic cylinder; a reset sensor measuring a reset reference point at which a measurement value of the stroke length obtained by the stroke sensor is reset; a stroke end detection process unit detecting a stroke end position of the hydraulic cylinder; a calibration process unit calibrating the measurement value of the stroke length upon the detection of the reset reference point and/or the stroke end position; and a monitor displaying on a screen at least the measurement value of the stroke length obtained by the stroke sensor and a calibration state obtained by the calibration process unit, wherein the monitor displays continuous time change of the measurement value of the stroke length obtained by the stroke sensor.

Stroke operation diagnosis supporting device for hydraulic cylinder

A hydraulic cylinder stroke operation diagnosis assisting device includes: movable portions that are sequentially supported by a vehicle body in a rotatable manner; a hydraulic cylinder between the vehicle body and each movable portion or between the movable portions to support the movable portions in a rotatable manner; a stroke sensor in the hydraulic cylinder to measure a stroke length of the hydraulic cylinder; a reset sensor measuring a reference reset point in which a value of the stroke length measured by the stroke sensor is reset; a stroke end detection unit detecting a stroke end position of the hydraulic cylinder; a calibration unit calibrating the measured value of the stroke length when the reference reset point and/or the stroke end position are detected; and a monitor displaying at least the measured value of the stroke length and a calibration state by the calibration unit.

Hydraulic cylinder stroke operation diagnosis assisting device and hydraulic cylinder stroke operation diagnosis assisting method

Disclosed is a control device of a hydraulically driven fan. The control device of a hydraulically driven fan is characterized by comprising first command value calculation means for calculating a fan speed command by a proportional term only while a difference between a target valve controlled variable and an actual valve controlled variable is not smaller than a predetermined threshold, second command value calculation means for calculating a fan speed command by the proportional term and an integral term while a difference between a target valve controlled variable and an actual valve controlled variable is smaller than a predetermined threshold, target valve controlled variable calculation means for calculating a target valve controlled variable of a control valve based on the calculated fan speed command, and control means for outputting a valve controlled variable to a control valve such that the control valve reaches the target valve controlled variable.

Control device of hydraulically driven fan

In an impact crusher, a rise of an advancing-retracting portion () of a gap adjuster () caused when a rebound plate () touches a rotor () or the rotation amount of the rotor () is detected to determine a zero-point position of the rebound plate () is determined based on the detected result, so that the zero-point position can be securely determined since it is not necessary to touch and vibrate the rebound plate with the rotor rotating at a high speed, and since the rebound plate () is not vibrated, the zero-point position can be securely determined without being influenced by the abrasion of the rebound plate () and the impact plate (), thereby accurately adjusting gap (C).

Control method of a gap adjuster of impact crusher and a gap adjuster

In a crushing system, an interlocked operation of operation units including a grizzly feeder, a crusher and a delivery conveyor and so on is stopped by depressing an interlock OFF switch (). For this, after stopping the grizzly feeder, a stop command section (B) outputs a stop command to the crusher and the delivery conveyor only when a load detector () once detects the load on the delivery conveyor and a determining section (A) determines that the load is cleared out and there is no remaining crushed material. Thus, if compared with conventional crushing systems adapted to stop the operation units only after the elapse of a predetermined time period, the crushing system can reliably prevent the crushed material from remaining on the delivery conveyor so that it is no longer necessary to worry about a situation where the crushed material remaining on the delivery conveyor has to be removed.

Crushing system

A rotational speed controller for mixing equipment of a soil modifying machine, by which optional quality of modified soil can be obtained, is provided. To this end, the rotational speed controller includes a mixer ( ) rotating to mix soil to be modified, drive means ( ) for rotationally driving the mixer, speed control means ( ) for controlling rotational speed of the drive means based on an inputted rotational speed command value (S , S ), working mode setting means ( ) for outputting a working mode signal (H, M, L, S) for setting a kind of soil to be modified, and a controller ( ) for outputting the rotational speed command value corresponding to the working mode signal to the speed control means.

Growing community of inventors

Hiratsuka, Japan

Katsuhiro Ikegami