Yunsung Lim

Estimation on the Emission Reduction of SULEV LPG Vehicles

SULEV (Super Ultra Low Emission Vehicle) which is one of the emission standards in Fleet Average System introduced to Korea from 2009 is known as the most severe standard to achieve with internal combustion engine. Considering low sales volume of hybrid vehicles in Korea, vehicle manufacturers are required to develop SULEV technologies for conventional gasoline and LPG vehicles to meet the future Fleet Average standard. In this study, the comparison of emissions has been made between SULEV developed and ULEV LPG vehicles mainly produced in this time. To estimate the emission reduction of SULEV vehicles, CVS-75 and NIER test modes have been used. CVS-75 has been used for emission certification of gasoline and LPG vehicles. NIER modes cover various average vehicle speed and reflect Korean real driving patterns better than CVS-75. The test results show that SULEV LPG vehicles have very high potential to reduce in regulated emissions, in green house gases and toluene in VOCs. However, SULEV LPG vehicles don`t affect much on the reduction of CO and total green house gases.

A Study on Reduction Effects of Air Pollutant Emissions by Automotive Fuel Standard Reinforcement

The air pollutants from vehicle exhaust gas are affected by many factors including fuel qualities, engine and vehicle technologies, driving patterns. In particular, fuel qualities and after-treatment devices could directly affect the emission level of pollutants. The pollutant reduction characteristics that caused by enforced fuel quality standard were analyzed. Three types of test fuel were selected in accordance with Korean automotive fuel standard in 2006, 2009, 2012 and used for vehicle emission test in chassis dynamometer. European COPERT correction equation of fuel impact was considered as reference information to quantify the vehicle emission test results. The contribution rates of exhaust emission by COPERT correction equation showed that aromatic compounds and oxygen contents in gasoline fuel was most important. In case of diesel fuel, cetane index and polycyclic aromatic compounds accounted for the greater part. The exhaust emission effects by COPERT correction equation revealed that CO and VOC was increased 0.86%, 1.57% respectively in after 2009 gasoline when compared to before 2009 gasoline fuel. In case of light-duty diesel vehicle CO, VOC and PM were decreased in range of 3~7%. The result from this study could be provided for developing future fuel standards and be used to fundamental information for Korean clean air act.

The Characteristics of Spray and Exhaust Emissions Environmental Assessment of Adulteration and Convention Diesel

Abstract Adulterations fuel have been using in the vehicle in these days. Because gasoline, diesel prices are rising every day. sopeople find more cheap price fuel. Adulterations fuel caused a serious air pollution problems. Adulteration fuel were madefrom waste engine oil, waste paint. According to Government regulations permit to be used recycle fuel(adulteration fuel)only in industrial boiler. Unburned fuel pollutants are effected to human health. In this paper, the hazardous air pollutantscharacteristics in the diesel vehicles according to adulterations of vehicle fuels were carried out in the NEDC test mode inchassis dynamometer. It is revealed that the all of the regulation pollutants (THC, NOx, CO and PM) emission in the adul-terations of vehicle fuels was increased also the green house gas, CO 2 was increased. In the hazardous air pollutants char-acteristics, the VOCs(Volitile Organic Compounds) BTEX(Benzene, Toluene, Ethylbenzene, Xylene) emissions in the adulterationsof vehicle fuels showed higher level than these in the diesel fuels.

The Effect on the Combustion and Emission Characteristics of HCNG Engine According to the High Purity Hydrogen Contents

This investigation decribes the effect of the combustion and emission characteristics of HCNG engine according to the high purity hydrogen contents. The HCNG fuel was made by the mixture with a high purity hydrogen () and a natural gas. The test vehicle was applied to the bi-fuel (Gasoline and CNG) system and this system was modified from the fuel supply and fuel tank. In addition, the three premixed HCNG fuels with mixed rate of 10, 20 and 30% of hydrogen were used to maintain the safety. In order to analyze the combustion characteristics of HCNG and CNG, the fuel was injected in the combustor with constant volume. The exhaust emission from light duty vehicle with bi-fuel system was analyzed by a chassis dynamometer and emission analyzer. From these results, the reduction rate of NOx emission increased in the HCNG fuel and emission amount of THC and CO shows a similar level with CNG fuel. This study can be utilized the basic data for the development of a new business plans related with HCNG engines.