以提高某小型二冲程发动机的动力性、经济性和稳定性为研究目标，运用发动机热力学数值计算软件建立原型机数学模型，通过全负荷条件下的缸内压力示功图、总功率和燃油消耗率对模型进行验证。在此基础上计算得到进气空气质量流量，确定各工况空燃比条件下的发动机初始喷油量，获得初始喷油脉谱图，由此开发了电控燃油喷射系统。经台架试验验证，发动机运转正常。%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 calcuated,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 he shortened.
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