Multi-variable variable gain controller design and simulation based on aero engine

Aimed at multi-variable variable gain controller design of aero engine in full envelope work, an improved KQ algorithm and its simulation applications are presented. First, we clarified the control theory and optimization algorithm of multi-variable KQ algorithms, and designed KQ controller via closed-loop desired function selection, controller structure selection and controller parameter optimization. Then we gave the stability proof and singular value analysis based on the designed KQ controller. Analysis shows that the designed KQ controller can make the system closed-loop stability, and has satisfactory low frequency instruction track, interference suppression, sensor noise suppression, high frequency unmodeled dynamic robust stability and non-sensitive low frequency engine modeling error, which can meet the control requirements of engine. Then, we designed a turbofan engine multi-variable KQ gain scheduling controller through scheduling variable selection, designed-point's KQ controller design and undersigned-points' KQ controller design by interpolation, and carried out a simulation to verify it. The results show that at the designed point, the controlled parameters have a fast response, the rise time is less than 1 s, and the coupling effect is less than 6% when the turbine temperatures and pressure ratios are step reference input signals. The KQ variable gain controller by interpolation method has better performance at the undersigned-points, and can achieve the turbofan engine full envelope control performance requirements.