Fault‐tolerant control for linear systems with multiple faults and disturbances based on augmented intermediate estimator

This study investigates the observer‐based fault‐tolerant control (FTC) problem for linear systems with multiple faults and external disturbances. Two novel types of FTC schemes are proposed, namely, the intermediate estimator‐based parameter adjustment (IEBPA) FTC scheme, which deals with linear systems with matched disturbances and the intermediate estimator‐based (IEB) H ∞ FTC scheme, which is applicable to linear systems with mismatched disturbances. For the case with matched disturbances, it is shown that the IEBPA FTC scheme ensures the states of the closed‐loop system to be uniformly ultimately bounded with an explicit bound. For the case with mismatched disturbances, it is proved that the IEB H ∞ FTC scheme guarantees the closed‐loop to be robustly stable with a prescribed H ∞ performance index. A simulation example is given to illustrate the effectiveness of the proposed methods.