Patent ID: 11966217
Assignee: EMERSON PROCESS MANAGEMENT POWER & WATER SOLUTIONS, INC.
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. A method of identifying faulty variables in on-line data indicative of an on-line operation of a process within a process plant, comprising:
receiving, from a process controller, the on-line data;
detecting an abnormal operating condition of the process by applying a multivariate state estimation technique (MSET) using a system matrix to the on-line data;
building a respective new matrix for each unique pair of process variables represented by data included in the system matrix, the data representing measurements of the process variables at distinct moments in time;
training a respective miniature system matrix for each unique pair of process variables using the respective new matrix;
defining a respective fault index for each process variable included in the system matrix;
determining estimated data for each unique pair of process variables by applying the MSET using the respective miniature system matrix to a respective portion of the on-line data;
incrementing the respective fault index of both process variables included in a unique pair of process variables when an estimation error corresponding to the estimated data for one of the process variables included in the unique pair exceeds a corresponding estimation error threshold; and
identifying a faulty variable by determining a respective process variable with a largest fault index.