公开(公告)号：US10378563B2

公开(公告)日：2019-08-13

申请号：US15562919

申请日：2016-11-09

Applicant: KOMATSU LTD.

Inventor： Atsushi Ishida ,  Yuto Fujii ,  Tsutomu Iwamura ,  Haruki Nishiguchi

IPC: E02F3/32 ,  E02F9/22 ,  F15B21/14 ,  F15B19/00 ,  F15B11/04 ,  E02F9/26 ,  F15B13/043 ,  E02F3/43

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.