Output-Constrained Switching Anti-Windup Compensation for Aero-Engines With Asymmetric Input Saturation

In practical aero-engine control systems, saturation constraints on the control input are inherently asymmetric and the engine outputs may exceed their physical or safety limits during the operation. This letter proposes a switching anti-windup compensation for aero-engines incorporating the asymmetric input saturation and output constraint simultaneously. To tackle the asymmetric saturation, we transform the aero-engine linear model with asymmetrically saturated input into a switched system, and all its subsystems possess symmetric saturation property. Based on this transformation, a switching anti-windup compensator with multiple anti-windup gains is developed to mitigate the performance deterioration induced by the saturation constraints. Furthermore, output constraints are also incorporated into the compensation design, which prevents engine outputs from exceeding their allowable limits during the control process. The switching between different anti-windup gains in real time can fully utilize the actuator capability, and further achieving a more desirable engine performance. Finally, hardware-in-loop (HIL) testing and comparative results demonstrate its effectiveness and superiority.