| 摘要 |
<p>A diesel particulate filter (30,60) is disclosed for removing particulates from the exhaust gases of smaller displacement light duty vehicle diesel engines (about 3.0 litres or less cylinder displacement or more refined larger engines) which typically generate particulates at an average rate of about 0.45 g/mile (0.28 g/km) or less in a normal driving cycle. The filter (30,60) comprises a honeycomb structure formed by a matrix of thin interconnected porous walls (32,62) defining a multiplicity of cells (38, 40, 68, 70) extending, in preferred embodiments, in a substantially longitudinal and mutually parallel fashion through the filter (30,60). An inlet group of the cells (38,68) is open at and define an inlet open end face (34,64) of the filter (30,60). An outlet group of the cells (40,70) is open at and define an outlet end face (36, 66) of the filter (30,60). The inlet cells (38,68) are closed adjacent to the outlet end face (36,66) and the outlet cells (40,70) are closed adjacent to inlet end face (34,64). The volume of the thin wall internal open porosity and the mean diameter of the pores forming the thin wall internal open porosity lie within the area defined by the boundary lines connecting the points A-B-C-D in Figure 5.</p> |
