Study on Evaluation and Improvement of CAPSS Diurnal Loss Emission Formula by Gasoline Vehicle Diurnal Test

Abstract

In vehicles that use gasoline as fuel, hydrocarbons generated in the form of evaporative gases are harmful to the human body and cause ozone generation. In order to reduce evaporative emissions, Korea has been steadily strengthening evaporative emission regulations and calculating the total amount of evaporative gases generated in gasoline cars through the Clean Air Policy Support System(CAPSS). However, the current CAPSS calculation formula has a limitation since it does not reflect regulatory strengthening and technological development. Therefore, this study intends to present the necessity and direction of improvement of the CAPSS evaporation gas calculation formula. The amount of evaporation gas emissions during parking(Diurnal loss test) of three gasoline vehicles is measured by SHED. The test results are evaluated by comparing them with the domestic CAPSS formula. The direction of improvement of the CAPSS formula was also presented.