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In this paper, a diesel particulate filter system which uses needle felt as filtering medium to collect diesel particulates has been developed and tested in practical operation of the urban bus. The system includes a bag filter, an exhaust cooler, and a control unit. It was installed under the chassis of a YZL 6730C diesel bus, which operates in a loop route mostly with heavy load. The bus has covered more than 5,000km, during which there was no failure of the filter system to cause bus abnormal operation. It needs to be cleaned for about 50km, and the collected particulate matter has to be discharged for every 1200km. It can operate reliably and easily with very high collection efficiency. The collected particulate matter is analyzed by GC (Gas Chromatography)/MS (Mass Spectrometer), it is found that the collected particulate matter contains many poisonous and carcinogen substances and the filter is also effective to collect some of the SOF.

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.