Fault-tolerant Control Scheme for the Sensor Fault in the Transition Process of Variable Cycle Engine

Abstract

This paper presents a fault-tolerant control (FTC) scheme for the sensor fault in the transition process of variable cycle engine (VCE) based on an adaptive equilibrium manifold model. Firstly, an adaptive equilibrium manifold model (AEMM) with multiple inputs and multiple outputs is established. Combined with the Kalman filter bank, sensor fault diagnosis is carried out to realize the diagnosis and signal reconstruction of the engine in the case of the single sensor and double sensor fault. On this basis, a sensor FTC scheme in the transient process of VCE is proposed, which uses the rotational speed for the closed-loop control. Finally, a hardware-in-loop (HIL) simulation platform is built based on the idea of distributed control. The FTC scheme of the sensor during the acceleration process of VCE is verified based on this platform. The results show that the fault tolerance scheme can accurately diagnose the fault of the low-pressure speed sensor during the acceleration process. After the fault, the analytic redundancy of the on-board model is used to replace the faulty sensor value to continue the closed-loop control, which ensures the reliability of the acceleration process.