Fault diagnosis in systems using fuzzy logic

Two tasks of fault detection in linear dynamical systems are addressed in this paper. On one hand, to estimate residuals, a system described by a model with some deviations in parameters or unknown input disturbances is considered. In such a situation, sensor fault detection using classical methods is not very efficient. In order to solve this problem, an adaptive thresholding approach using fuzzy logic is proposed. On the other hand, to locate faults, a fuzzy logic technique is put in place of usual classical logic used with dedicated observer scheme