Influence Of Ethanol Gasoline On General Gasoline Engine Fuel System

At present, with the development of industrialization and the promotion, fossil fuels(non-renewable energy) dried up, thirst for biofuels is more and more serious, at home and abroad has been the use of pure biofuels and promote industrialization gradually, general machinery industry is developing rapidly in China, the yield is increased year by year, the export quantity is growing rapidly, and the mixed fuel(such as ethanol gasoline), more and more widely used in general gasoline engine, as the biofuels promotion, the proportion of mixed oil biofuels will gradually increase, or even completely replace the natural oil; From pure gasoline to the transition of the mixed gas in the process of the engine parts and components, especially the fuel oil system under the influence of mixed gas is more and more serious, the exposed problems also more to the more;Thesis aimed at the influence of ethanol gasoline in general gasoline engine fuel system, combined with the current market feedback, this paper analyzes the corrosion problem of fuel system, a great deal of experiments and analysis, the results are as follows:1. Through the analysis of the corrosion phenomena and corrosion factors one by one, verification and validation, finally determined the cause of the corrosion in fuel system is: the carburetor residual cleaning fluid in the process of production, oxidation liquid can produce corrosion of carburetor needle valve; Carburetor needle valve in the process of nickel plating technology not to deal with the stress and hydrogen treatment, cause the needle valve nickel plating layer falls off; Due to the fuel system exists in the chloride, chloride dissolved in water is not only a good electrolyte and accelerated corrosion, due to the potential difference, violation of other protective oxide.2. In view of the fuel system corrosion reasons put forward the corresponding improvement measures and each verification: increase the carburetor cleaning times; Change the needle valve by aluminum nickel plating to square copper nickel plating, nickel plating process to add to deal with the stress and to deal with the hydrogen; With chlorinated rubber parts in fuel system to not chlorine fluorine rubber or single tubing change to lining does not contain chlorine double tubing;3. According to the corrosion reason and improvement measures, and puts forward the control measures of late products production, through the process of APQP and PPAP to control product production process, the needle valve and rubber parts of testing the corresponding testing standards and measures, to form the system documents;This thesis research for other of the same type of mixed fuel of general gasoline engine fuel system also has certain reference value, the influence of solve the enterprise the current practical problems, to provide actual model support the company's other product development.