Application of a direct adaptive control method for non-ASPR aeroengine

Aimed at the non-ASPR model of aeroengine, a new kind of direct adaptive controller of turbofan engine control system is put forward. The structure of a Command Generator Tracker (CGT)-based direct adaptive controller is simple, and no filter is needed. However, the controlled plants are required to be almost strictly positive real(ASPR), which limits its applications. For this, a Parallel Feedback Compensator (PFC)is designed to transfer non-ASPR model to ASPR model, and makes the non-ASPR model to meet the requirement of CGT-based direct adaptive control. The method has no need to identify and the parameters of th plant, so the structure of the system is simple. It also has a strong adaptive ability to variations of the parameters. Finally, the proposed approach is applied to the design of a non-ASPR model turbofan engine control system, and simulations are performed to show that the method is correct and feasible.