公开(公告)号：US20180283418A1

公开(公告)日：2018-10-04

申请号：US15562919

申请日：2016-11-09

Applicant: KOMATSU LTD.

Inventor： Atsushi ISHIDA ,  Yuto FUJII ,  Tsutomu IWAMURA ,  Haruki NISHIGUCHI

IPC: F15B19/00 ,  E02F3/32 ,  E02F9/22 ,  E02F3/43 ,  E02F9/26 ,  F15B13/043 ,  F15B11/04

CPC classification number: F15B19/002 ,  E02F3/32 ,  E02F3/435 ,  E02F9/2228 ,  E02F9/2267 ,  E02F9/2285 ,  E02F9/2296 ,  E02F9/264 ,  F15B11/04 ,  F15B13/043

Abstract: A work vehicle includes a work implement, a valve adjusting a flow rate of a hydraulic oil operating the work implement, an electromagnetic proportional control valve generating a pilot pressure guided to the valve, a controller outputting a current to the electromagnetic proportional control valve, and a sensor for detecting an operation of the work implement. The controller increases stepwise a current value of a current output to the electromagnetic proportional control valve by repeating processing for temporarily lowering a current value of the current output to the electromagnetic proportional control valve and thereafter outputting to the electromagnetic proportional control valve, a current having a current value greater than the current value before lowering. The controller calibrates data for predicting an operation speed of the work implement based on a result of detection by the sensor at the time when the current value is increased stepwise.

公开(公告)号：US20180266082A1

公开(公告)日：2018-09-20

申请号：US15540077

申请日：2016-11-09

Applicant: KOMATSU LTD.

Inventor： Akira TANISHIGE ,  Yoshiki KAMI ,  Takashi YOKOO ,  Yuto FUJII ,  Haruki NISHIGUCHI

IPC: E02F9/26 ,  E02F3/30 ,  E02F9/22 ,  E02F3/43

CPC classification number: E02F9/264 ,  E02F3/307 ,  E02F3/3677 ,  E02F3/434 ,  E02F9/2228 ,  E02F9/2271 ,  E02F9/2285 ,  E02F9/2296 ,  E02F9/267

Abstract: A main controller controlling an operation of a work vehicle includes a determination unit and an abnormal condition determination unit. The determination unit determines whether or not an attachment has a sensor based on information on an attachment. When the determination unit determines that the attachment has the sensor and when the abnormal condition determination unit cannot receive a signal from the sensor, the abnormal condition determination unit determines that an abnormal condition has occurred.

公开(公告)号：US20210381195A1

公开(公告)日：2021-12-09

申请号：US17288944

申请日：2019-12-10

Applicant: KOMATSU LTD.

Inventor： Atsushi MURA ,  Haruki NISHIGUCHI ,  Hayato HISA ,  Hiromu DAMBAYASHI ,  Akihiko TERAMURA ,  Kazuki TAKEHARA ,  Katsuhiro IKEGAMI

IPC: E02F3/43 ,  E02F9/22 ,  E02F9/20 ,  E02F9/26

Abstract: 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.

公开(公告)号：US20180363269A1

公开(公告)日：2018-12-20

申请号：US15562925

申请日：2016-11-09

Applicant: KOMATSU LTD.

Inventor： Yuto FUJII ,  Haruki NISHIGUCHI

IPC: E02F3/43 ,  E02F3/30 ,  E02F3/32 ,  E02F9/22 ,  E02F9/26

Abstract: A work vehicle includes a bucket which can perform a tilting operation with a hydraulic oil, a valve adjusting a flow rate of the hydraulic oil having the bucket perform the tilting operation, an electromagnetic proportional control valve generating a pilot pressure guided to the valve, a controller outputting a current to the electromagnetic proportional control valve, and a first sensor for detecting the tilting operation. The controller detects a horizontal state of the bucket based on an output from the first sensor. The controller adjusts a value for the current output to the electromagnetic proportional control valve after the horizontal state of the bucket is detected, and starts calibration of data for predicting an operation speed of the bucket in the tilting operation.