title: Fault diagnosis viewed as a left invertibility problem.
abstract: This work deals with the fault diagnosis problem, some new properties are found using the left invertibility condition through the concept of differential output rank. Two schemes of nonlinear observers are used to estimate the fault signals for comparison purposes, one of these is a proportional reduced order observer and the other is a sliding mode observer. The methodology is tested in a real time implementation of a three-tank system.
authors.affiliation: Departamento de Control Automático, CINVESTAV-IPN, Av. IPN 2508, 07360 DF, Mexico. rguerra@ctrl.cinvestav.mx
authors.forename: R
authors.initials: R
authors.lastname: Martínez-Guerra
authors.forename: J L
authors.initials: JL
authors.lastname: Mata-Machuca
authors.forename: J J
authors.initials: JJ
authors.lastname: Rincón-Pasaye
keywords: Differential output rank; Fault diagnosis; Left invertibility condition; Reduced order observer; Sliding mode observer