Design of observers for TakagiߝSugeno descriptor systems with unknown inputs and application to fault diagnosis

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Observers design for uncertain Takagi-Sugeno systems with unmeasurable premise variables and unknown (2011, unknown): “Then the MM approach is a mean to deal with nonlinear systems and to design observer for such systems [17, 18, 19, 20, 21, 22].”
A New Approach to Sensorless Control Method for Brushless DC Motors (2008, background): “The unknown input observer has been widely researched [12-14], especially in the fault detection field [ 15-17 ].”
Design of Observers for Takagi-Sugeno Systems with Immeasurable Premise Variables: an ℒ2 Approach (2008, background): “Moreover, the unknown input observers designed for linear systems, were transposed, in the same way, into the case of nonlinear systems and application to fault diagnosis is envisaged in (Marx et al., 2007).”
Robust fault detection and estimation for descriptor systems based on multi-models concept (2012, background): “Only few results like [5] are dedicated to the use of these models for state estimation and in [4] for fault estimation.”
An alternative to inverse dynamics joint torques estimation in human stance based on a Takagi–Sugeno unknown-inputs observer in the descriptor form (2008, background): “Conversely, T-S descriptors have been introduced by (Taniguchi et al., 2001) and some recent results have dealt with controller design (Bouarar et al., 2007) or observer design for descriptor systems (Marx et al., 2007).”