A Bumpless Transfer Control Strategy for Switched Systems and Its Application to an Aero-Engine

This article investigates a bumpless transfer control problem for switched systems. Since the control input signal of a controller switching system jumps when a switching occurs, the transient performance of the practical system may suffer bad effects. To avoid the damage to the system caused by the jump of control input signal, we propose a simple bumpless transfer control structure containing a differentiator and an integrator to smooth the control input signal and a common compensator designed to compensate the deviation from the original switching control input signal for eliminating the steady-state error. Furthermore, we give the sufficient conditions to guarantee asymptotic stability for linear and nonlinear bumpless transfer control systems, respectively. Moreover, we verify the recoverability and effectiveness of the proposed control strategy. Finally, a hardware-in-the-loop simulation for a variable cycle engine shows the feasibility and superiority of the proposed method.