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In this paper, plasma technology is used for diesel particulate treatment for a minibus manufactured by Hyundai Company. A Corona Discharged Particulate Plasma Collector (CDPPC) is developed and tested for removal of the diesel particulates. Firstly, experimental research of two CDPPCs are made on an engine dynamometer test bed. Performances of the CDPPCs are investigated including particulate reduction efficiency, pressure drop, and the influential factors are also checked. The tested engine is a D4BX Diesel engine equipped with the minibus. Secondly, the CDPPCs are tested with the minibus on a chassis dynamometer based on FTP 75 Driving Cycle. The results showed that the CDPPC could reduce the engine exhaust smoke to almost zero at low engine speed and the pressure drop of the CDPPC is comparative to the muffler. The most influential factors are the HVSS (High Voltage Supply System) Voltage and the engine speed.

Engine misfire (total or partial) causes a negative effect on the engine power and the exhaust emissions such as HC, CO and NOx. Moreover, it causes damage to the three-way-catalyst(TWC) system permanently. So, Engine misfire should be detected and eliminated. This study introduces a new system concept which is detecting combustion misfire using breakdown voltage (BDV) characteristics between electrodes. The focus of this study is that the detection and decision of misfire criterion through the misfire intensity calculation with BDV signal, which is derived by the application of a high bias voltage (30kV) to the spark-plug gap in the engine continuously. This study is driven to check the relation among BDV signal and misfire intensity inside an engine cylinder.