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Control of the J-85 Turbojet Engine Using the Edmund's Method and the Extended Kaiman Filter Technique

This paper presents the design of a J-85 turbojet engine controller using the Edmunds' method and the extended Kaiman filter technique. A nonlinear engine model was first linearized at 50 selected operating points throughout the flight envelope of the J-85 engine. The Edmunds' method was then used to design a linear controller for each operating point. The objective of this method is to design a simple controller which achieves a desired performance criterion. Finally, for full flight envelope operation, the controller gains were assumed to be power functions of the engine's altitude, Mach number, and compressor rotor speed with unknown power parameters. The extended Kaiman filter technique was used to identify these unknown parameters.