Title:
WORK MACHINE
Document Type and Number:
Japanese Patent JP2020020397
Kind Code:
A
Abstract:
To provide a work machine capable of suppressing erroneous determination on clogging of a hydraulic oil filter due to the difference of a flow rate of hydraulic oil flowing in the hydraulic oil filter, to determine the clogging of the hydraulic oil filter with high accuracy.SOLUTION: When at least one of a pump flow rate discharged from a hydraulic pump 7 and a flow rate flowing into a hydraulic oil filter 6 is less than a pump flow rate threshold Q1 preset based on the relationship between the flow rate of hydraulic oil passing through the hydraulic oil filter 6 and pressure loss, the differential pressure across the hydraulic oil filter 6 detected by a differential pressure detector 8 is larger than a predetermined differential pressure threshold, and the temperature of the hydraulic oil detected by a temperature detector 11 is equal to or higher than a predetermined temperature threshold T1, it is determined that the hydraulic oil filter 6 is clogged.SELECTED DRAWING: Figure 3
Inventors:
ITO RYOSUKE
NISHIKAWA SHINJI
ODAKA KATSUAKI
ARABARI MASASHI
NISHIKAWA SHINJI
ODAKA KATSUAKI
ARABARI MASASHI
Application Number:
JP2018144566A
Publication Date:
February 06, 2020
Filing Date:
July 31, 2018
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B20/00; B01D35/02; B01D35/143; E02F9/00; E02F9/20; E02F9/26
Attorney, Agent or Firm:
Kaichi International Patent Office