甲醇汽油对发动机性能及喷油策略的影响

The Performance and Injection Strategy for an Engine using Methanol-Gasoline Blended Fuels

由台架试验获得了电喷发动机燃用普通汽油和不同比例甲醇汽油的外特性和负荷特性曲线。结果表明,发动机中使用不同比例甲醇汽油时,其动力输出普遍下降,油耗性能亦恶化,但考虑到甲醇的市场价格远低于普通汽油,因此发动机燃用甲醇汽油仍具备较好的经济性能。为了高效、稳定地使用不同比例甲醇汽油,必须对发动机的喷油时间和点火提前角做一定调整。

Through the experiment on an electronic fuel injection（EFI） gasoline engine fueled with traditional gasoline and different proportion of methanolgasoline blended fuels, the external characteristic curve and load characteristic curve were obtained. The results indicate that the power output decreases generally when the methanolgasoline blends are used; although the fuel consumption behavior is getting worse, the economic per formance is still satisfactory since the market price of methanol is much lower than gasoline. For a traditional engine, it time of fuel infection and spark advance angle have to be adjusted, so as to run efficiently and stably when the methanolgasoline blends are used.