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The air cleaning device in this study consists of a stainless steel mesh used to negatively charge dust particles at the inlet and metal-coated fabric filters to collect the dust at 12, 24, and 48 volts. This device can replace the currently commercialized dust collector (which requires 6,000 volts for generating corona discharge), which could not be installed in motor vehicles due to its high voltage and generation of ozone. The test results show the device performs equally as well as the device with high voltage and could be comfortably applied to clean air in cars during their operation.

EGR system is considered to be the most effective way of reducing the pollution, especially NOx, from diesel engine exhaust gas. However, EGR system is hampered by soot accumulation. In this study, a low-voltage soot removal device was installed at the air inlet in the EGR system. Measurements made with a Bosch smoke meter indicated that use of this device resulted in about a 50 - 84% reduction of soot, which would enable continuous use of EGR in diesel engines. The soot accumulated at the filter was easily removable and combustible into CO2.

This study relates to the simultaneous reduction of NOx and soot exhausted from Direct Injection Diesel Engine. With use of the surface treated carbon fiber, NOx is significantly reduced through the adsorption and chemical conversion into N2 and CO2. With use of stainless steel nets connected with the cathode and electro conductive material composed of Cu coated cloth, carbon fiber and stainless steel net connected with anode of the car battery, soot is collected electrically and is easily removal and combustible into CO2. The test result operated with 500 ml D.I. Diesel Engine shows excellent performance of NOx and Soot at more than 50% reduction with the long recycle life of the used material.