The Application Study Of Substitute Fuels In The EFI Engine

With many years of development, substitute fuel has played an important role in reducing the exhaust emission and ameliorating the structure of fuel. Many kinds of substitute fuels developed in the same time will be retained a long time. With the different development of technology and intense competition, maybe a kind of fuel will substitute the gasoline and diesel.The motive of this thesis is evaluating the characteristic of these substitute fuels and providing the theory basis about enlarging the using of substitute fuel in the EFI engine.This thesis introduces the current situation of the several substitute fuels—Liquefied Petroleum Gas, Methyl Alcohol Petrol, Ethanol Petrol and looks forward to their development trend. The chemical and physical peculiarity and application characteristic of LPG, Methyl Alcohol Petrol and Ethanol Petrol are analyzed. Experiments of the EFI engine are carried out including dynamics, economy and exhaust emission by using LPG, M15, M30, E10, E20 and 93#gasoline. The performance curves of exhaust emission, wan-you-te-xing, full-load velocity and load (2000r/min and 4000r/min) are analyzed.The results of the experiments have shown: compared with the 93#gasoline, the engine using E10 and E20 retains its high dynamics performance especially in the high rotation speed and reduces its exhaust emissions and improves the fuel consumption. For the more, the exhaust emission of the engine using E20 is better than E10; however, compared with the 93#gasoline, the engine using M15 and M30 doesn't retain its high dynamics performance and improves the fuel consumption and reduces its exhaust emissions especially M30; compared with the 93#gasoline, the dynamics performance of the engine using LPG is detracted especially in the low rotation speed and detractes the fuel consumption and the exhaust emissions distinctly.By comparing with gasoline in the same condition and finding out the advantages and disadvantages of the substitute fuels, people can comprehend their property of using and selecting right fuel according to requirement.