Efficiency optimized fuel supply strategy of aircraft engine based on air-fuel ratio control

作     者：Yixuan WANG Yan SHI Maolin CAI Weiqing XU Qihui YU 

作者机构：School of Automation Science and Electrical Engineering Beihang University School of Mechanical Engineering Inner Mongolia University of Science & Technology 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2019年第32卷第2期

页      面：489-498页

核心收录：

学科分类：082502[工学-航空宇航推进理论与工程] 08[工学] 0825[工学-航空宇航科学与技术] 

基　　金：financially supported by the National Natural Science Foundation of China (No. 51605013) the Pneumatic and Thermodynamic Energy Storage and Supply Beijing Key Laboratory 

主　　题：AFR control Aircraft engines Efficiency optimization Fuel supply strategy Simulation and experiments 

摘      要：Accurate fuel injection control of aircraft engine can optimize the energy efficiency of UAV power system while meeting the propeller speed requirement. Traditional injection control method such as open-loop calibration causes instability of fuel supply which brings the risk of power loss of UAV. Considering that the closed-loop control of AFR can ensure a stable fuel feeding, this paper proposes an AFR control based fuel supply strategy in order to improve the efficiency of fuel-powered UAV while obtaining the required engine speed. According to the optimum fuel injection results, we implement fuzzy-PID method to control the set AFR in different situations. Through simulation and experiment studies, the results indicate that, to begin with, the calibrated mathematical model of the aircraft engine is effective. Next, this fuel supply strategy based on AFR control can normally realize the engine speed regulation, and the applied control algorithm can eliminate the overshoot of AFR throughout all the working progress. What is more,the fuel supply strategy can averagely shorten the response time of the engine speed by about two seconds. In addition, compared with the open-loop calibration, in this work the power efficiency is improved by 9% to 33%. Last but not the least, the endurance can be improved by 30 min with a normal engine speed. This paper can be a reference for the optimization of UAV aircraft engine.