Development of a Small Aviation Two-stroke Kerosene Engine Fuel Injection Controller

摘要

Background: The study of kerosene fuel for gasoline engines is of great significance tothe supply, management, storage, transportation of military fuel, as well as its safety. A small aviationtwo-stroke kerosene engine fuel injection controller is the key technology of kerosene engines.It is very important to improve the performance of kerosene engine by controlling the air-fuel ratioaccurately.Objective: In this study, the initial injection pulse spectrum was firstly obtained by numerical calculationin the absence of kerosene injection pulse spectrum, and then the injection controller was designedbased on the initial injection pulse spectrum.Methodology: Firstly, a numerical model of the whole engine was established by using BOOSTsoftware. The air mass flow data of the inlet was obtained through numerical calculation. Theamount of initial engine fuel injection was calculated according to the requirements of air-fuel ratiosin each working condition, from which an initial injection pulse spectrum was obtained. Then, basedon Freescale 16-bit embedded micro-controller MC9S12DP512, a kerosene engine fuel injectioncontroller was developed, together with the circuit. According to the initial fuel injection pulse spectrum,a two-dimensional interpolation algorithm was developed by using assembly language and Clanguage mixed programming, and the anti-electromagnetic interference ability of the controller wasfurther enhanced. Finally, the accuracy of the initial injection pulse spectrum and the performanceand reliability of the injection controller of the kerosene engine were verified by the kerosene enginebench test.Conclusion: The experimental results show that the numerical model was accurate, and the developmenttime of the injection controller reduced by using the numerical model to calculate the initialinjection pulse spectra. The developed controller was observed to be stable and reliable, which canmeet the control requirement.