【作者】 苏菱；

【导师】 黄敬党；

【作者基本信息】 福建农林大学 ， 农业机械化， 2003， 硕士

【摘要】 本文通过对本田EC2500C发动机改燃LPG后进行实验，对发动机的HC、NO、CO的排放进行分析后，结果表明：HC和NO的排放随着转速的升高逐渐降低，并且随着功率的升高而升高。发动机低速运转时，采用稀薄燃烧，空燃比控制在1.05～1.10的范围内，HC的排放较小：发动机较高转速运转时，发动机不论是否采用稀薄燃烧，HC的排放量均很小。低速高负荷时NO的排放较大，高速低负荷时NO排放较小。发动机使用LPG后，CO的排放大幅度降低，而且随着空燃比的增加继续降低。根据分析的结论得到空燃比控制策略：发动机输出功率小于额定功率的70％时，空燃比控制在1.05～1.10的范围内；发动机的输出功率超过额定功率的70％时，发动机高速运转，并采用理论空燃比的运行方式。更多还原

【Abstract】 This paper presents the experiment on Honda EC2500C engine fuelling with LPG. With the analysis of the engine emission of HC, NO, CO, the result showed that the emission of HC and NO decreased gradually with the increment of engine speed and increased with the increment of power. When the engine running at low speed, lean mixture was adapted. The air fuel ratio was controlled between 1. 05~1. 10, the emission of the HC was small; When the engine running in high speed, no matter whether the lean mixture was adapted, the emission of HC was always small. The emission of NO was high in conditions of low speed and heavy load and was small in conditions of high speed and light load. When the engine using LPG, the emission of CO was reduced greatly and continued decreasing with the increment of air fuel ratio. Basing on the result, the air fuel ratio control strategy is concluded: when the output power of engine is less than 70% of the rated power, the air fuel ratio between 1. 05~ 1. 10 is controlled; When the output power of engine is larger than 70% of the rated power, the engine running in high speed, the stoichiometric air fuel ratio running method is applied.更多还原