Abstract
Keywords:
Evaporative Emission, RVP(Reid Vapor Pressure), GC(Gas Chromatography)
Abstract
The regulations for hydrocarbon emissions from vehicles have become much more stringent in recent years. These more stringent regulations request vehicle manufacturers to develop the fuel system for reducing evaporative emissions. The evaporative emission has many sources in vehicle. Among the sources, fuel’s contribution amounts for the great majority of evaporative emissions. So, it is important to research the effect of fuel’s composition on evaporative emission and RVP’s change during test. In this paper, the fuel system of LEV II was tested according to US’s evaporative emission test procedure. For the detail analysis of fuel’s effect, GC(Gas Chromatography) was used and RVP(Reid Vapor Pressure) was measured. The measuring points are initial state, after FTP75 mode , and after diurnal test. According to the test result, the decrease of RVP after FTP75 is very large, compared with the RVPs of initial state and after diurnal test. And, the ratio of Paraffin and Olefin components in fuel decreased, but the ratio of Aromatic components increased. So, it is guessed that Paraffin and Olefin components in fuel have very close relation with RVP and DBL.