Research On Control Strategy Of Small Kerosene Piston Engine Based On ControlBase

As a kind of typical power unit, reciprocating piston engine is an essential part in the particular machinery domain such as unmanned aerial vehicle. The kerosene is close with gasoline in the physics and chemistry characteristic, however, it is more security, not easy to explode, easy to transport and has higher energy density. So the piston engine which use kerosene as the fuel will be a development tendency in the future general aviation and the special vehicle power units. The research on kerosene piston engine has become a hot spot in recent years.Kerosene also has some problems, such as bad spray characteristics, mixing characteristics and lighting characteristic. In view of these questions, scientists in abroad has already proposed some related answers and made some substantive progress. In the meantime, some representative kerosene piston engine product had been published, however, it was not widely used due to different reasons. In domestic, research on kerosene piston engine was conducted lately, and the technology is imperfect,so there is no mature product.Firstly, Based on the analysis of kerosene piston engine development status in domestic and overseas, we decided to do a research on kerosene piston engine electronic control strategy.Meanwhile, we choose ControlBase which is a rapid control prototyping to make a research on ECU and its whole condition control strategy by analyzing and comparing the methods of the ECU development. Secondly, after finishing the overall analysis of the kerosene piston engines and parts of structure transformation, we established a research platform for kerosene piston engine combining the experiment request. Then, a kerosene piston engine control strategy and a injection control method based on the prediction of the intake mass were designed, which based on the physical and chemical properties of kerosene and the performance requirements of each condition. A one-dimensional numerical model of the kerosene piston engines was established by GT-power, and a simulation was also done to verify the accuracy of the numerical model. We predict the performance and the intake air mass by that numerical model. At the same time, according to every condition control strategy,combining with the bottom callable module of ControlBase, we established the kerosene piston engine control strategy model by Simulink and verified the control strategy model logic. Finally, we finished a calibration for parameters and basic MAP, and completed a performance test on the research platform of kerosene piston engine. After Comparing with the simulation, we get the result.The control strategy mode can make hardware and software iteration quickly using the fullymodel-based methods. Meanwhile, the control strategy based on intake air mass prediction can insure a reliable operation for the engine. The conclusions show that the engine works stably in idle speed and the air-fuel ratio is controlled well in normal condition; At the selected operating point, effective fuel consumption rate is higher than simulation prediction, and the mean effective cylinder pressure is a little lower than the simulation forecasts; Cylinder pressure curve in the test is similar with the cylinder pressure curve predicted in simulation, but the maximum explosion pressure is slightly lower than the latter. Due to the error between test data and simulation prediction data is small and in a reasonable range, the kerosene piston engine control strategy based on rapid control prototyping ControlBase is proved to be effective.