Control Method for Limit Protection of Turbofan Engine Based on Improved Model Free Adaptive Algorithm

A data-driven based improved model free adaptive control method is proposed to solve the problem of engine limit protection control. Taking the main closed-loop control system as the design object, the over-limit protection control system achieves a faster response by increasing the error change rate into the criterion function of the conventional model free adaptive control law. The stability condition of the improved system is given, and the controller parameters are tuned by the critical proportional method. The simulation results show that compared with the conventional model free adaptive limit protection controller, the proposed improved model free adaptive limit protection controller reduces the maximum overshoot by an average of 2.97% and reduces the damping time by an average of 2.30 seconds at different working points. The limit protection control system can draw back from the over-limit state quickly, which ensures the safe operation of the engine system. © 2020, Editorial Department of Journal of Propulsion Technology. All right reserved.