Design And Verification Of Electronic Control System For Micro-sized Aviation Turbojet Engines Under Multiple Working Condition

In recent years,with the advancement of aviation engine technology,the rapid rise of integrated circuits,and the continuous improvement of precision machining technology,the design of unmanned aerial vehicles has tended towards miniaturization.A company QH-WP40 turbojet engine has the advantages of high thrust-to-weight ratio,low cost,and small size,and is suitable for power demands below 1000 N,making it of significant research value.The engine operates under various operating conditions during a mission cycle.Under different operating conditions,the control parameters need to be adjusted to adapt to the operating state under each condition.This paper analyzes the requirements of the electronic control system and designs the overall scheme of the electronic controller,including the hardware circuit drawing and software program compilation of the electronic controller,as well as the PCB circuit board soldering and module debugging experiments.Using historical test data,a mathematical model of fuel supply and actual speed was established for the speed control system of the micro-sized aviation turbojet engine under multiple operating conditions.A speed control method based on artificial fish swarm algorithm and adaptive fuzzy control PID was proposed,and real-time engine speed control was achieved through fuzzy PID.Finally,the basic control performance of the electronic control system was verified based on the bench test.The main research contents are as follows:(1)Based on the technical characteristics and indicators of the QH-WP40 engine,the electronic control system of the micro-sized aviation turbojet engine under multiple operating conditions was analyzed.The electronic controller scheme and the speed control design under multiple operating conditions were proposed.(2)In order to improve the response speed and stability of the engine speed control system under multiple operating conditions,a speed control method based on artificial fish swarm algorithm and adaptive fuzzy control PID was used.A mathematical model of fuel supply and actual speed was established using historical test data.Compared with the conventional PID control algorithm,the maximum oscillation value of the algorithm in this paper was 3500 rpm,which was better than the maximum oscillation value of 4000 rpm of the conventional PID control.After optimizing the initial values of the improved artificial fish swarm algorithm,its superiority was further demonstrated,improving the control effect.(3)The hardware circuit of the electronic controller was designed,including the minimum system circuit design,signal data acquisition circuit design,driver circuit design,communication circuit design,storage circuit design,and electronic controller PCB design,and the PCB circuit board was printed and soldered.(4)Based on the software scheme design of the engine electronic controller and the hardware circuit design scheme,the software system of the electronic controller was divided into five software application tasks.The software control system can drive the execution mechanism and monitor the engine operating state in real time through data acquisition.Module and bench tests were conducted to verify that the control system can complete the engine control work.