The mode switch control research of small-type parallel TBCC engine based on SQP method

Aiming at the mode switch control problem of small type parallel TBCC engine, a modal switch control method based on SQP method was presented in this paper. Participating sequences were composed of the important parameters which affecting TBCC engine performance in the flight envelope. Then the design mode switch point through analyzing the grey correlation degree between the participating sequence and the evaluation sequence based on the grey correlation method was obtained. The control law of the mode switch could be acquired through optimizing the control parameters in the mode switch process by the SQP method according to the criterion of continuous thrust. Finally, smooth transition and continuous thrust in the mode switch process of the turbine/ramjet combined cycle engine could be obtained by the design method were evaluated through the digital, hardware in the loop and semi-physical simulation tests.