| With the development of automotive industry, energy crisis and environment pollution problem are increasing. And now, many countries have established emission control regulations to limit engine and vehicle exhaust emission, including CO,NOx and PM etc. However, with the continuously increasing of greenhouse effect and energy crisis, many countries have already put out regulation to restrict emission of CO2. Many engine and vehicle manufacturers are studying low fuel consumption and low exhaust emissins technology.The development of China emissions standards on light-duty vehicles and emissions control technology for every stage are discussed firstly. Base on the equipment, test processand test preparation, this paper compars the difference of China II,III evaporative emissions. It also analyzes the difference of exhaust emissions standards for China -III and EU-III.There have been many differences between Chinese and other country gasoline(especially higher sulfur and olefin content), for the reason of characteristic of Chinese oil industry; an the other hand, the vehicle in China is much different from other countries. So the result of other country doesn't appropriate to Chinese situation. This dissertation mainly focuses on the effects of fuel sulfur and olefins contenton vehicles emissions. The experiments design considers the all kinds of problemwhich could affect the precision of the test result. Reducing gasoline sulfur contentsreduced composite cycle THC, CO and NOx emissions. |
