US 12,422,839 B2
Cause estimation apparatus and cause estimation method
Shunsaku Matsumoto, Tokyo (JP); Kuniaki Aoyama, Hyogo (JP); Yasuyuki Ogawa, Tokyo (JP); Takashi Sonoda, Tokyo (JP); and Daisuke Kudo, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 18/015,846
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Oct. 13, 2021, PCT No. PCT/JP2021/037894
§ 371(c)(1), (2) Date Jan. 12, 2023,
PCT Pub. No. WO2022/085535, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 2020-176531 (JP), filed on Oct. 21, 2020.
Prior Publication US 2023/0259116 A1, Aug. 17, 2023
Int. Cl. G05B 13/02 (2006.01); G05B 23/02 (2006.01)
CPC G05B 23/0275 (2013.01) 10 Claims
OG exemplary drawing
 
1. A cause estimation device comprising:
an input/output interface;
a storage device;
a central processing unit (CPU) that:
acquires a measurement value of a target apparatus;
calculates, in a case where it is assumed that a plurality of events that occur in the target apparatus occur due to a common cause, a likelihood of an occurrence of each of the events based on the measurement value that has been acquired;
stores, in the storage device, a cause table in which a cause of occurrence of the event and a frequency of the cause of occurrence are associated with each other for each of the events;
rewrites the frequency registered in the cause table into a frequency in the case where it is assumed that the events occur due to the common cause, and estimates the cause of occurrence based on the rewritten cause table and the likelihood;
receives setting of a predetermined noise value for an item having a frequency of 0 set in the cause table, and updates the frequency registered in the cause table based on the setting; and
outputs, via the input/output interface, the cause of occurrence that has been estimated in order of the likelihood.