가솔린 기관 연료 펌프계의 압력 맥동 해석에 관한 연구

Abstract

In this study, the author studied a high pressure pump used in GDI(Gasoline Direct Injection) engine system focusing on simulation model development. The high pressure pump is a core component in fuel supply systems of GDI engines. Through the study, generation and damping of pressure pulsation in the pump were handled with a great deal of weight. In chapter 2, operating principle of the high pressure pump was analysed. Then, simulation model of the high pressure pump was developed by using AMESim software. In chapter 3, volumetric efficiency and pressure pulsation characteristic were investigated through a preliminary experiment with the pump. In addition, effective bulk modulus of the pulsation damper was measured using a newly devised test equipment. And, the damper modeling on AMESim software was suggested based on the results of the preliminary experiments. In chapter 4, the experimental results in chapter 3 were compared with the simulation results obtained the simulation model in chapter 2 and 3. Through the process, the validity of the simulation model was confirmed. In chapter 5, The effects of main design parameters such as oil temperature and high pressure chamber volume on the pump performances were investigated by simulations using the verified simulation model. Consequently, it was confirmed that a reliable simulation model for a high pressure pump in GDI(gasoline direct injection) engine system was developed in this study. The author expects that the simulation model can be utilized to check performance variations depending on design parameters′ change in newly designed high pressure pumps in GDI engines.