Research Of Real-World Diesel Emission Characteristics And Emission Control Technology

The number of cars has reached 1 billion in 2010. At the end of 2009, the national vehicle number was 186,580,600, including 76,193,100 motor vehicles. Motor vehicles were 16.69 million more than last year. The number of vehicle in Shenzhen grows more than 10% every year and reached 1.32 million in April 2009, of which diesel accounted for 1/5. Motor vehicle-related supporting infrastructure and increasingly urban road space cannot meet the needs of people. Haze days are rising year by year. Shenzhen haze days reached 231 days in 2007. Therefore, the emission characteristics of diesel vehicles and its control technology are very important.This paper based on a large number of analyses and recording of video statistics, obtained a real and effective basic data related to diesel vehicles in Shenzhen. Identified the main test models and test circuits according to the traffic conditions and the main area which high-pollution vehicles always traveled in Shenzhen.10 different types of diesel vehicles at different age were selected to do the vehicle emission test. The total emissions of diesel vehicles in Shenzhen were forecasted which makes the various factors that influenced the emission more prominent.The results show that the actual road vehicle emission factors are much higher than the state regulations (more than 10 times on average). As the displacement increases, the real road emissions are more serious. Compared with the test results in Tianjin and Beijing, the real road emission factors are insignificant between North and South cities in china, indicating the test results can be applied in most domestic cities, with high value.Through the vehicle emission tests of various model we get diesel vehicle emission factors, combined with the age composition, annual mileage and the number ratio data of Shenzhen diesel vehicles. Then we figure out in this year the diesel vehicle's total PM emissions in Shenzhen are 36430.4t, total NOx emissions are 112174.7t, CO emissions are 43155.49t and HC emissions are 78814.86t. The heavy container trucks emission tests indicate that the design of on-road vehicle emission test system works well and the results show that the heavy container trucks' emission are the most serious. The number of heavy container trucks which conforms to Euro I emission regulation is 15,709 and accounted for 6.35% of the total number of diesel vehicles. Its PM annual emissions reached to 10686t, accounted for 27% of the total diesel PM emissions.Through the test we also get the exhaust temperature MAP and analysis the feasibility of the DPF installing.By learning domestic and foreign outstanding experience and pollution control measures have been implemented in Shenzhen, some pollution control measures are figured out based on study, such as installation of DPF, promotion of new energy vehicles, replacing the old vehicles with the news and tightening standards of high-polluting vehicles for monitoring and elimination, which covers the technical, economic and policy aspects.