A method and system for improving the performance of a turbofan engine control system

Abstract

The invention discloses a method and a system for improving the performance of a fanjet control system. In an original fanjet control system with an independent first controller K, a second controller Ks is added; therefore, the dynamic characteristics of the system are improved by adopting switching control under the conditions that the characteristics of the fanjet control system are fixed, and PID controller coefficients and sensor and actuator parameters are determined. The method comprises the following steps: firstly, maintaining the original first controller K, and adding the second controller Ks; secondly, selecting the second controller Ks so that the unit step response performance is superior to the performance of the first controller K; thirdly, switching logic designing: under the condition of unit step response, designing a switching logic into a switching condition when output response reaches a certain set threshold value; fourthly, threshold value designing: finding out a threshold value e, so that the accommodation time ts is optimal; fifthly, numerical simulation verification: adopting switching control to improve the dynamic characteristics of the system. The system is small in computing resource occupation, and simple and convenient in designing and debugging.

Description

technical field [0001] The invention belongs to the technical field of turbofan engine control, and relates to a method and system for improving the performance of a turbofan engine control system. Background technique [0002] As a complex, multivariable, strongly coupled nonlinear system, the turbofan engine's control process is extremely complicated. The control system of the turbofan engine must not only provide satisfactory dynamic characteristics and steady-state characteristics, but also must meet a series of restrictions such as: temperature restrictions of the combustion chamber, turbine and tail nozzle, speed restrictions of high and low pressure turbine shafts, compressor Boost ratio limit to avoid surge, etc. On the other hand, the dynamic characteristics of a turbofan engine vary with the operating conditions, and a single controller cannot meet all performance requirements within the full flight envelope. In order to solve this problem, the common method is t...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of the prior art, aiming at the problems of excessive inertia and slow response in the sensors and actuators in the turbofan engine control system of the prior art, and to provide a method and method for improving the performance of the turbofan engine control system. Its system occupies little computing resources for the electronic controller of the turbofan engine, and is simple and easy to operate

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