In order to solve the problems of combustion instability and excessive discharge of gasoline compression ignition (GCI) engine at low load, three-dimensional numerical simulation software CONVERGE is used to establish engine simulation model, and the main factors controlling combustion such as the oxygen content and the intake pressure are simulated and analyzed. The results show that when the volume fraction of the oxygen content of intake is 23%, higher thermal efficiency and lower emissions can be achieved. When the intake pressure is 0.12MPa, the peak of heat release rate is the highest and the combustion efficiency is high. The research results provide basic data and theoretical basis for achieving stable combustion at low load conditions.
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