LPV/PI Control for Nonlinear Aeroengine System Based on Guardian Maps Theory

Yifan Qian,Li Zhou,Haibo Zhang,Zhifeng Ye

doi:10.1109/access.2019.2929572

Abstract

The requirement of fighter’s maneuverability puts forward higher indexes for the control performance of aeroengine. It is generally recognized that the proportion integration (PI) control is the most commonly used control method of aeroengine. However, due to the high nonlinearity and performance requirements of aeroengine, the selection of PI parameters needs more accurate methods to satisfy higher performance requirements. In this paper, the linear parameter varying (LPV) model is established according to a nonlinear mathematical model of a turbofan engine. Then, the LPV/PI control based on guardian maps theory is proposed to solve the highly nonlinear aeroengine control problem which improves the response characteristics of aeroengine without changing the control method in the range of the scheduling parameters. In the process of design, a set of controller parameters satisfying the performance requirements is automatically generated by a given initial controller parameter, so designing the controllers at multiple equilibrium points is avoided. Finally, the simulations are performed by the integral separation of PI control at different points in the flight envelope for the nonlinear model. The results illustrate that the control method based on guardian maps theory can contribute significantly to solving the nonlinear problems of aeroengine control system.

Highlights

The aeroengine is a complex system with highly nonlinearity, and the working state varies with the external changes when working in a wide range of flight envelope lines [1]
This paper addresses an issue of linear parameter varying (LPV)/proportion integration (PI) control based on guardian maps theory for nonlinear aero-engine system
DESIGN PROCESS OF LPV/PI CONTROLLER BASED ON GUARDIAN MAPS THEORY In engineering practice, proportion integration differentiation (PID) control is one of the most widely used control methods, it is still widely used in aeroengine control system due to its various advantages

Summary

INTRODUCTION

The aeroengine is a complex system with highly nonlinearity, and the working state varies with the external changes when working in a wide range of flight envelope lines [1]. Guardian maps theory is applied to the control system of hypersonic vehicles to maintain the system stability when operating in a wide range of envelopes [12] Motivated by these considerations, this paper addresses an issue of LPV/PI control based on guardian maps theory for nonlinear aero-engine system. This paper addresses an issue of LPV/PI control based on guardian maps theory for nonlinear aero-engine system It overcomes the difficulty of guaranteeing global control performance compared to traditional variable gain control. A detailed PI control algorithm based on the guardian maps theory is proposed, and PI controllers with different scheduling parameters can be obtained offline by the algorithm which avoid the real-time problem compared with traditional.

AEROENGINE MODEL

PARAMETER TUNING ALGORITHM

ALGORITHM

Findings

CONCLUSION