The Best Choice of Gasoline/Diesel Particulate Filter to Meet Future Particulate Matter Regulation

Particulate filter is one of the major technologies to meet air pollution environment regulation since the first introduction to market of diesel passenger car in 2000. It is an indispensable part from September 2011 when the particle number of exhaust gas should be limited for new models. This is also a hot issue for gasoline engines with direct injection technology for improvement of fuel economy even though the EURO 6 regulation for GDI gasoline vehicles is not yet finalized. Car OEMs are under development exploring various options. Otherwise this kind of technology has some task to overcome, such as back pressure resulting in a fuel penalty, burden of increased cost and temperature control within the durable limit. The materials for particulate filters have their own characteristics as material itself. The choice of material is heavily dependent upon the control strategy for soot regeneration. This paper shows what the best selection of particulates filter material is and how to optimize the system for future product competitiveness.