Active Fault Diagnosis in Closed-loop Systems
Abstract
Active fault diagnosis (AFD) of parametric faults is considered in connectionwith closed loop feedback systems.AFD involve auxiliary signals applied on the closed loop system.A fault signature matrix is introduced in connection with AFDand it is shown that if a limit number of faults can occur in the system,a fault separation in the fault signature matrix can be obtained.Then the single elements in the matrix only depend of a reducednumber of parametric faults.This can directly be applied for fault isolation.If it is not possible to obtain this separation, it is shown how the faultsignature matrix can be applied for a dynamical fault isolation,i.e. fault isolation based on the dynamic characteristic of the faultsignature matrix as function of the different parametric faults.
