Experimental Research on the Effect of Gasoline Quality on Vehicle Emission and OBD System

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With the surging emissions standards for cars and strict and the application of advanced emission control technology, the influence of fuel quality on vehicle emissions is increasingly important. As a result, automobile, petrochemical industry in the United States, Japan, Europe and other countries and regions have cooperated on the research on the car, engine and fuel system. Key technical indicators of fuel limit corresponding to gradual enhancement of the vehicle emission regulations are put forward. With the issue of country's III and IV phase vehicle emission standards, fuel specifications that meet the discharge standard should be established. Effect of gas composition and properties on vehicle performance and emissions Gasoline is mainly composed of three types of hydrocarbons, namely olefin, alkanes and aromatic hydrocarbons. Because gasoline itself contains a certain amount of sulfur in crude oil, sulfur generally can't be completely removed during the gasoline refining, so it will contain a certain amount of sulfur in gasoline. Effect of the sulfur content in gasoline on vehicle emissions The sulfur in the gasoline can obviously reduce the efficiency of the catalysts in the catalytic converters. Sulfur can also adverse effects on the high temperature exhaust gas oxygen sensor. (1) To reduce sulfur content in fuel oil can directly reduce the emissions of vehicles with catalytic conversion device significantly. Impact of the sulfur on the vehicle emissions of pollutants has been researched with extensive experiments. Effect of the benzene content in gasoline on vehicle emissions Benzene naturally occur in the crude oil composition, it is also catalytic reforming products, a high octane number gasoline components. It is also known a carcinogen. Benzene content controlling of gasoline is the most direct limit from the evaporate emission and effective method to vent of benzene emissions. Studies have shown that the benzene content in gasoline with exhaust gas of benzene emissions is produced by linear relationship, benzene emissions also have very high contribution to gasoline aromatic compounds. Many countries law makers have realized controlling benzene content in gasoline is an effective method to reduce benzene harm to mankind.