A Multi-objective Switching Control Strategy for Aero-engines Considering Sensor Dynamic

Abstract

This paper investigates the thrust tracking problem with safety constraints for aero-engines. A new switching control strategy is proposed to pursue the tradeoff between tracking performance and safety. A switching controller consisting of three sub-controllers and a switching logic is designed. Since the sensor dynamic is taken into account, the control input cannot influence derivative of the constrained output directly. So safety protection controller must be activated before the system trajectory reaches the safety boundary. A locally monotonic tracking controller is designed for the safety protection mode. The proposed switching logic is based on the monitoring of the tracking performance and the safety requirement. Control discontinuity which is bad for transient performance is eliminated through the integral reset technique. The proposed strategy is designed based on the equilibrium manifold expansion (EME) model. This nonlinear model can describe aero-engine’s dynamic behavior more accurately. The effectiveness of the proposed strategy is verified through the nonlinear component-level (NCL) model of a two-spool turbofan engine. Simulation indicates the better performance by using the proposed switching control strategy than the single control strategy.