Zonotoptic Fault Estimation for Discrete-Time LPV Systems With Bounded Parametric Uncertainty

Implementation of Fault-Tolerant Control for a Robot Manipulator Based on Synchronous Sliding Mode Control

“…In AFTC, the quality of the fault-tolerant control depends on the accuracy of both FE and the system reconfiguration after faults occur. In fault estimation processing, several techniques [10][11][12][13][14][15] have been used. The parameter estimation method [10] is used to early detect faults applied for dynamic linear and nonlinear systems.…”

“…However, this method is limited in real applications due to the disadvantages such as the chattering phenomenon, the requirement of the knowledge of the fault's bound to choose the observer parameters, and the stability issue. In addition, other techniques such as the Kalman Filter [13], zonotope [14], and nonlinear observer [15] were developed to estimate the faults as well as uncertainties/disturbances. After faults are estimated, they are compensated for by using various control strategies [16][17][18].…”

Simultaneous fault estimation for uncertain Markovian jump systems subjected to actuator degradation

“…Summarizing the aforementioned discussions, the problem on estimations of the state and faults for MJSs have attracted intensive attention, and some desired results have been achieved . Notably, Li et al and Yin et al devised approaches to estimate both the actuator and sensor faults at the meantime, relying upon the designs of sliding mode observers with TRs being completely known.…”

“…Summarizing the aforementioned discussions, the problem on estimations of the state and faults for MJSs have attracted intensive attention, and some desired results have been achieved. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Notably, Li et al 15 and Yin et al 17 devised approaches to estimate both the actuator and sensor faults at the meantime, relying upon the designs of sliding mode observers with TRs being completely known. Li and Zhu 18 developed an adaptive observer for MJSs with GUTRs to simultaneously provide the estimations of actuator and sensor faults, on the basis of which a fault-tolerant controller was constructed.…”

Interval estimation of actuator fault by interval analysis

“…When addressing the obstacle avoidance issue for vehicle systems, it is very useful to provide the confidence interval of estimated faults. Based on the fault confidence interval, an FTC scheme can be designed to improve the security and reliability of vehicle systems [26]. Therefore, interval estimation, which is used to compute two bounds enclosing all the feasible faults in a guaranteed way instead of a single point approximation, can be considered as an alternative [27, 28].…”