Actuator Fault Tolerant Control of Variable Cycle Engine Using Sliding Mode Control Scheme

Yuan Yuan,Zhonglin Lin,Tianhong Zhang,Xinglong Zhang,Zhiwen Zhao

doi:10.3390/act10020024

Abstract

This paper presents a fault tolerant control (FTC) design for the actuator faults in a variable cycle engine (VCE). Ensured by the multiple variable geometries structure of VCE, the design is realized by distributing the control effort among the unfaulty actuators with the “functional redundancy” idea. The FTC design consists of two parts: the fault reconstruction part and the fault tolerant control part, which use a sliding mode observer (SMO) and a sliding mode control (SMC) scheme respectively. Considering the inaccuracy of the fault reconstruction result, the proposed design requires only inaccurate fault information. The stability of the closed-loop control system is proved and the existence condition for the proposed control law is analyzed. This work also reveals its relation to the sliding mode control allocation design and the adaptive SMC design. An application case is then studied for tolerating the loss of effectiveness fault of the nozzle area actuator. Results show that the FTC design is able to tolerate the fault and achieves the same control goal as in the fault-free situation. Finally, a hardware-in-the-loop test is carried out to verify the design in a real-time distributed control system, which demonstrates its use from the engineering perspective.

Highlights

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Ble cycle engine is proposed with sliding mode control scheme.The

Summary

Introduction

All developments focus on ensuring and improving the required safety levels and reducing the risks that critical failures occur [1]. This is especially true for safety-critical systems like aircraft engines. Major parts of the control system including sensors, actuators and the engine itself, shown, operate in harsh conditions, which accelerates the occurrences of faults. These faults may lead to catastrophic events with significant costs, both in terms of economy and human lives.

Methods

Results

Conclusion