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In the whole world, emission regulations for vehicles with internal combustion engine have been dramatically strengthened to reduce air pollutions of urban area. Recently, SULEV and EURO-6 emission standard were applied to the gasoline and diesel vehicles in Korea, respectively. Therefore, emission characteristics on passenger car using gasoline including HEV and diesel fuel according to the various test modes were conducted in this study. In order to this investigation, exhaust emission characteristics of gasoline and diesel vehicles were measured and analyzed by using chassis dynamometer (Chassis dynamometer 48˝compact 2WD, AVL) and emission analyzer (MEXA-7000 series, Horiba). Test vehicles were selected the 3 domestic models of a car in Korea. For analysis on emission characteristics according to driving cycles including certification mode, NEDC, FTP-75 and WLTP modes was applied. From these results, it can be shown that all test vehicle models meet the emission standard.

The exhaust emission standards of vehicles using diesel fuel have been tightened for the prevention of air pollution. Therefore, this paper was carried out to study on the exhaust emission characteristics in the diesel engine with the Urea-SCR system according various urea contents rate. In order to analyze the emission characteristics, the diesel engine with six cylinders (7.6L) with the high pressure common-rail was used and it was applied to urea-SCR systems. In addition, the urea contents of six cases (0, 30, 32.5, 35, 37.5, 40%) were used to investigate the exhaust emission characteristics in the Urea-SCR system. To analyze the exhaust emission, the MEXA-7200D (Horiba) was used and FTIR (Horiba, MEXA-6000FT) was applied for the analysis of NH3. From this study, it is revealed that the NOx emission was significantly reduced as the urea content rate was increased until the 30%. However, the decreasing rate of NOx emission shows a slight steady reduction over the 30%.

Nations around the world have implemented various policies to control and manage air quality but VOCs (volatile organic compounds) aldehydes, and micro hazardous air pollutants are not subject to strict regulation compared to other exhaust emission sources of passenger cars. In this regarde, this study was conducted to evaluate how hazardous pollutants from passenger cars contribute to air pollution using gasoline and LPG fuels. For the study, a passenger car with GDI(Gasoline Direct Injection) and one with the LPI(LPG Port Injection) system were selected to evaluate the contribution rate of hazardous pollutants. Catalyst temperatures were measured for the prevention of emission variation in the process of stabilizing the catalyst and the modal data from the test mode was validated by using a chassis dynamometer (Horiba).