Patent ID: 11865483
Assignee: NEC CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  A | IPC A  B  F

Claim 6:
7. The computer-implemented state estimation method according to claim 5, comprising:
calculating a correlation value between each of one or more pairs of pieces of current information acquired consecutively and retained in the current information storage and a correlation value between the current information acquired at the state estimation practice time point and the current information acquired immediately before the state estimation practice time point; and
determining that cleaning of the filter has been practiced, when the correlation value between the current information acquired at the state estimation practice time point and the current information acquired immediately before the state estimation practice time point, changes to decreasing, deviating from a trend of the correlation values between each of the one or more pairs of pieces of current information acquired consecutively and retained in the current information storage.