A Way to Design an Adaptive Fuzzy Controller for the Dispenser Position of an Air-Breathing Engine

Abstract

Fuel consumption control in a combustion chamber of an air-breathing engine is carried out by a metering device (dispenser). The metering needle of the dispenser is driven by a hydraulic cylinder. The hydraulic cylinder is controlled by a spool-valve amplifier of an electromechanical device. The idea of fuel consumption control in the combustion chamber is to position the metering needle with a given accuracy. An adaptive astatic fuzzy controller of the metering needle position is designed for controlling the dispenser. The controller consists of a fuzzificator, a unit for correcting the fuzzificator’s grade of membership, a defuzzificator, and an integrator. The fuzzificator consists of a set of linear terms (negative small, negative medium, normal, positive small, positive medium). The last ones are multiplied in addition to synapses tuned by an adapting unit with comparison element and built-in adder for correcting the fuzzificator’s grade of membership. The adaptation procedure is performed by step-by-step learning with the help of recurrent formula. The defuzzificator, consisting of a set of five unimodal membership functions, is used for transforming the fuzzy information into clear information. Defuzzification is performed by the centroid method. The loop for controlling the dispenser is an integral part of the loops for controlling parameters of the air-breathing engine.