二冲程发动机, 数学模型, 空气质量流量, 初始喷油脉谱图

To improve the power performance,fuel economy and reliability of a small two stroke engine,a numerical model of the prototype engine was created by utilizing the thermodynamic numerical calculation software.The model was verified by the pressure indicator diagram in the cylinder, total power and fuel consumption rate under full load conditions.Then, the air mass flow in the intake port was acquired by numerical computation,the data of the injection quantity of the engine was calculated,and the initial injection map was obtained.Based on the map,an electronic control fuel injection system was developed.The engine bench test runs smoothly, which is the verification of the numerical model of the engine. Thus, the foundation for injection calibration of the engine has been built.The development cycle of injection system will be shortened.