US 11,852,294 B2
Diagnosis system of lubricating oil and diagnosis method of lubricating oil
Kyoko Kojima, Tokyo (JP); Mitsuru Saeki, Tokyo (JP); and Shinichiro Aikawa, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Appl. No. 17/638,414
Filed by Hitachi, Ltd., Tokyo (JP)
PCT Filed Oct. 15, 2020, PCT No. PCT/JP2020/038978
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2021/095436, PCT Pub. Date May 20, 2021.
Claims priority of application No. 2019-205210 (JP), filed on Nov. 13, 2019.
Prior Publication US 2022/0316653 A1, Oct. 6, 2022
Int. Cl. F16N 29/00 (2006.01); F03D 80/70 (2016.01); G01N 21/27 (2006.01); G01N 33/30 (2006.01)
CPC F16N 29/00 (2013.01) [F03D 80/70 (2016.05); G01N 21/27 (2013.01); G01N 33/30 (2013.01); F05B 2260/98 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A diagnosis system of lubricating oil of a wind power generator, comprising:
a nacelle of the wind power generator;
a lubricating oil utilization device disposed within the nacelle;
a lubricating oil tank, disposed within the nacelle, for storing lubricating oil to be supplied to the lubricating oil utilization device;
a circulation line, within the nacelle, through which lubricating oil circulated between the lubricating oil tank and the lubricating oil utilization device flows; and
a sensor, disposed within the nacelle, which measures characteristics of the lubricating oil; and
a server, disposed within the nacelle, that is coupled to the sensor and is configured to:
acquire sensor data of the sensor, which is used for diagnosis after more than a predetermined time elapses since the lubricating oil utilization device enters a stoppage state, and
determine whether a value of the data of the sensor is below a predetermined threshold,
upon determining the value of the data of the sensor is below the predetermined threshold, present a notification indicating replacement of the lubricating oil is necessary, and
upon determining the value of the data of the sensor is not below the predetermined threshold, estimate a replacement time for replacing the lubricating oil.