Supervisory Control of Multiple Switching Laws With Performance Guidance for Aeroengines

This brief is concerned with the problem of speed regulation control for a two-spool turbofan engine. Firstly, after analyzing the operation characteristics of the aeroengine, we give multiple switched equilibrium manifold expansion (EME) models on the basis of multiple operation modes. Meanwhile, the switching laws are based on the performance indexes that reflect the operation characteristics of the aeroengine in different operation modes. Then, a supervisor is proposed to orchestrate multiple switching laws through checking which operation mode the aeroengine operates in. Furthermore, to enhance the robustness of the aeroengine control system, an optimal control strategy is employed. However, as an acknowledged difficult problem, the analytic nonlinear optimal controller can be hardly obtained. Therefore, we present a modified linear quadratic regulator algorithm for the controller design and give a notion of an EME controller. Moreover, we offer a design process of the switching controllers and present a sufficient condition of the asymptotic stability of the closed-loop switched system for the aeroengine. Finally, a software simulation and a semiphysical simulation experiment for some aeroengine are provided to demonstrate the effectiveness of the proposed method.