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Related Experiment Video

Updated: Jun 19, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

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Fault Reconstruction for Continuous-Time Switched Affine Systems With Actuator Faults via an Integrated UIO Approach.

Fang Liao, Yanzheng Zhu, Xudong Zhao

IEEE Transactions on Cybernetics

|June 17, 2026

Summary

This study presents a novel observer for reconstructing actuator faults in switched affine systems (SASs). The method enables accurate estimation of system states and faults, even with unknown fault bounds, demonstrated in a buck converter.

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Area of Science:

Control Systems Engineering
Fault Detection and Diagnosis

Background:

Switched affine systems (SASs) are prevalent in various engineering applications.
Actuator faults in these systems pose significant challenges to operational safety and reliability.
Existing fault reconstruction methods often have restrictive design constraints.

Purpose of the Study:

To develop a robust fault reconstruction method for continuous-time SASs with unknown bounded actuator faults.
To relax design constraints associated with traditional coordinate transformations.
To enable simultaneous asymptotic reconstruction of system states and actuator faults.

Main Methods:

Design of a novel TNL interval observer for system output interval estimation.
Development of an algebraic relation linking system states and actuator faults.
Proposal of an unknown input observer (UIO) integrating Luenberger-like and algebraic schemes.
Application of the average dwell time (ADT) switching constraint to mitigate chattering.
Derivation of sufficient conditions using multiple Lyapunov functions.

Main Results:

The TNL interval observer successfully provides interval estimates of system outputs.
The proposed UIO achieves asymptotic reconstruction of both system states and actuator faults.
The ADT constraint effectively prevents high-frequency switching-induced chattering.
Sufficient conditions for fault reconstruction are rigorously derived.

Conclusions:

The developed fault reconstruction technique is effective for SASs with actuator faults.
The method demonstrates practical applicability and efficiency through a buck converter case study.
The approach offers a valuable tool for enhancing the safety and reliability of switched systems.