An active fault-tolerant control framework against actuator stuck failures under input saturations

Abstract

In this paper, a control framework including active fault-tolerant control (FTC) and reference redesign is developed subject to actuator stuck failures under input saturations. FTC synthesis and reference redesign approaches are proposed to guarantee post-fault system safety and reference reachability. Then, these features are analyzed under both actuator stuck failures and constraints before fault-tolerant controller switches. As the main contribution, actuator stuck failures and constraints are unified so that they can be easily considered simultaneously. By means of transforming stuck failures into actuator constraints, the post-fault system can be regarded as an equivalent system with only asymmetrical actuator constraints. Thus, methods against actuator saturations can be used to guarantee regional stability and produce the stability region. Based on this region, stuck compensation is analyzed. Specifically, an unstable open-loop system is considered, which is more challenging. Furthermore, the method is extended to a set-point tracking problem where the reachability of the original reference can be evaluated. Then, a new optimal reference will be computed for the post-fault system if the original one is unreachable. Finally, simulation examples are shown to illustrate the theoretical results.

Synergetic Control for HVAC System Control and VAV Box Fault Compensation

“…Many methods of FDD for air-handling units (AHUs) are presented by Yu et al (2014). Other methods have been proposed in the area of FDD (Sauter and Hamelin, 1999;Chen and Patton, 2012;Chabir et al, 2008;Qi et al, 2017).…”

A quadratic boundedness approach to a neural network-based simultaneous estimation of actuator and sensor faults

“…To achieve such a goal new advanced fault diagnosis and control systems are developed. One of the leading research trends is devoted to developing novel fault-tolerant control (FTC) schemes, which have numerous applications in the real systems [3,5,12,13,21,23,24,27]. Nowadays, the main direction of developing FTC systems is oriented on the various observers-based approaches.…”