汽油/CNG混合燃料发动机的性能和燃烧特性研究

Study on the Performance and Combustion Characteristics of an Engine Fueled with Gasoline/CNG Mixture

研究了汽油/CNG混合燃料的发动机性能和燃烧特性。在研制汽油/CNG发动机集中电子控制单元基础上,研究了不同汽油和天然气混合比例对发动机动力性能、排放性能的影响,结果表明,随着混合燃料中天然气比例的增加,发动机的功率和转矩下降,HC和NOx排放降低,在不同负荷下应供给发动机不同比例的汽油和天然气,这样既可以获得较好的发动机动力性能,又可以实现发动机低排污特性;对燃烧特性的研究结果表明,在天然气中混入汽油有利于改善天然气的燃烧特性,混合物的燃烧特性参数随两种燃料的混合比的不同而不同,其值界于天然气和汽油之间。

Study on the performance and combustion characteristics of an engine operating on the gasoline/CNG mixture fuel is put forward in this paper. The influence of various proportion of gasoline and CNG mixture on the engine power and emissions were investigated based on the development of the integrated control ECU for gasoline/CNG. Experimental results showed that the engine power and torque decreased while HC and NO_x emissions decreased with the increase of CNG proportion in the gasoline/CNG mixture, and it can be concluded that by supplying different ratios of gasoline/CNG under different engine loads, the engine can achieve both better engine power performance and lower emissions. Meanwhile, engine combustion of the gasoline/CNG mixture showed that it was beneficial to the combustion of CNG by adding gasoline. The combustion parameters vary with the ratio of gasoline/CNG mixture, and these values are within the values of pure CNG and pure gasoline.