Ki-Ho Kim

The Experimental Study of the Effect of Oxygenates on Exhaust Emissions and Fuel Economy of MPI and GDi Vehicles

In this study, the effects of various oxygenates for gasoline on exhaust emissions and fuel economy in MPI and GDi vehicles were investigated. Various oxygenates such as MTBE, TAME, ETBE, Bio-ethanol were selected. Oxygenate blend fuels that oxygenate were added in suboctane have about 2.3 wt % of oxygen content. FTP-75 mode and HWFET mode, which are widely used in Republic of Korea and the US to test fuel economy, were applied to investigate exhaust emissions from the test vehicles. Gaseous emissions such as CO, NMHC and NOx did not show any significant correlation with oxygenates, although a slight difference between oxygenate blend fuels and suboctane as a base fuel was observed. The combined fuel economy of a blend fuel having MTBE increased 0.3 % in an MPI vehicle and 1.3 % in a GDi vehicle, but that of other fuels decreased. In particular, the combined fuel economy of a blend fuel with bio-ethanol decreased 2.7 % in an MPI vehicle and 1.6 % in a GDi vehicle. The particle number concentration of oxygenate blend fuels was less than that of suboctane, but the difference between oxygenate blend fuels was slight in FTP-75 mode. In HWFET mode, the particle number concentration has a very similar tendency in MPI and GDi vehicles. When compared with each of the oxygenate blend fuels, the particle number concentration of a TAME blend fuel was highest while that of bio-ethanol was lowest.

The Study on Effect of Emissions and Performance of a Conventional Vehicle using the High Concentration Alcohol Blended Petroleum Product

As concern about energy security and global warming many countries have been making effort to reduce fossil fuel. In the case of US, as one of the efforts, the standards of the alcohol vehicle fuels(including blended with gasoline) have been established. Alcohol is known that make some trouble concerning startability, durability and corrosion when using as fuel of a conventional vehicle. For these reason, alcohol usage needs not only the fuel standard, but also a modified car. In the case of Korea, although there are no the standard and the modified vehicle yet, high concentration alcohol blended fuel has being sold at illegal market. In this study, exhaust gas and performance of the conventional vehicle that alcohol(methanol and isopropyl alcohol) blends were fueled were measured to notify danger of using them without preparation of institutional arrangements. Also, to analyze correlation characteristics of the fuels and them, property test of the fuels was conducted. The test result show that bad-startability caused by low RVP and high T10 affected increase in NMOG and CO. NOx was increased under the highest short term fuel trim caused by high Oxygen content and low NHV of alcohol. According to increasing as alcohol content, fuel economy and acceleration ability were decreased but CO2 was not significantly

The impact study on fuel economy of electric vehicle according to the test mode characteristics

With rising fuel costs and the depletion of fossil fuels, electric vehicles of high efficiency has been increasing interest. although high-performance battery continually is developing, Electric vehicles is not satisfied with the characteristics of the environment. In this study, By using the current fuel economy testing methods(5-cycle test), until the fully discharged battery electric vehicles is evaluated for a variety of environmental and operating conditions. As a result, Electric vehicles showed a low energy consumption efficiency in low temperature and rapid acceleration, deceleration in the operating environment compared with normal temperature.