Study Of Effect Of Bio-Additive On Advanced Gasoline Engine Performance

With the challenges of energy sources shortage and environment pollution in global vehicle industry, the development of internal combustion engine depends on the innovation of technologies. Using additive is one of the most effective methods to change the character of fuel in order to improve fuel economy and emission performance of engine. However, traditional additives are harmful to human beings or engine components. In this paper the influence of a bio-additive on an advanced gasoline engine nowadays is studied.Preexistent researches indicate that the bio-additive can improve fuel combustion, shorten combustion duration period, make the combustion faster and more complete. So this bio-additive can improve the fuel economy and emission performance. These researches lay a foundation for the development of new green bio-additive.Because the performance of engine have been improved largely by new technologies and new regulation of fuel have been issued , it needs to be confirmed that whether bio-additive can take effect on advanced gasoline engine whose comprehensive performance is excellent already . The influence of bio-additive on engine was tested by bench tests, including fuel economy, emission performance and power performance.The bench tests showed that the bio-additive can improve the fuel economy obviously, though the engine has excellent fuel economy already. When bio-additive was added to 93# gasoline, the fuel consumption can be reduced 8.24% and 10.2% at most respectively when engine speed is 2000r/min and 3500r/min. According to the tests of exhaust emissions, NOx emissions decreased, CO emission keeps the same level, but HC emission has small increase. By comparing the maximal powers of the two speeds it was found that the bio-additive had a minor effect to the power performance of engine.Because the use of gasohol becomes wider in our country we added bio-additive into gasohol to take comparative experiment. The results show that bio-additive can improve the character of gasohol too. So it can compensate for the loss of fuel economy to a certain extent. The main emissions have a same trend as 93# gasoline except NOx emission. The NOx emission is affected by bio-additive slightly.According to the results of bench tests, it is found that the effects of bio-additive have relation to the percent of bio-additive, power, speed, the type of engine and the component of fuel. So it needs to take account of these factors when the optimalt percent of bio-additive is chosen.