US 11,703,819 B2
Unit space update device, unit space update method, and program
Ichiro Nagano, Yokohama (JP); Mayumi Saito, Tokyo (JP); and Keiji Eguchi, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/278,799
Filed by Mitsubishi Power, Ltd., Kanagawa (JP)
PCT Filed Nov. 5, 2019, PCT No. PCT/JP2019/043316
§ 371(c)(1), (2) Date Mar. 23, 2021,
PCT Pub. No. WO2020/091077, PCT Pub. Date May 7, 2020.
Claims priority of application No. 2018-207490 (JP), filed on Nov. 2, 2018.
Prior Publication US 2022/0026866 A1, Jan. 27, 2022
Int. Cl. G05B 19/042 (2006.01)
CPC G05B 19/042 (2013.01) [G05B 2219/2639 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A unit space update device that updates a unit space, which is configured by a plurality of bundles of detected values for each of a plurality of evaluation items and serves as reference when calculating a Mahalanobis distance, the unit space update device comprising:
a detected value acquiring unit that acquires a bundle of detected values detected in a constant cycle; and
a deletion processing unit that deletes one bundle from the plurality of bundles of detected values configuring the unit space so that, when adding the bundle of detected values to the unit space as a new bundle, the deleted one bundle is replaced with the new bundle,
wherein the deletion processing unit has
a first processing unit that randomly deletes one bundle from the plurality of bundles of detected values configuring the unit space, and
a second processing unit that deletes, for detected values of an evaluation item determined in advance among the plurality of evaluation items, any one bundle, among bundles including detected values with highest frequency of appearance in the unit space or one bundle of two bundles between which a difference in detected value is smallest in the unit space, and
wherein the deletion processing unit generates a random number, selects the first processing unit when the random number is equal to or smaller than a reference value set in advance and selects the second processing unit when the random number is larger than the reference value to cause the selected one to perform deletion processing.