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The life of DPF would be decided by ash durability because pressure loss of DPF is increased by accumulation of ash that is produced when soot is burnt in the DPF. We could succeed to increase maximum ash capacity and extend the life of the DPF by an approach from the filter design, making inlet cell volume larger than outlet cell. Furthermore, when the inlet cell is designed octagon, we found that slanted wall blocking the inlet cells is functional worked for soot filtration. As the results, we could improve to manage both transient pressure loss while the soot is collected and the ash durability by the cell shape with (inlet cell/outlet cell) = (octagon/square).

The pore diameter and porosity of SiC-DPF has been increased by elaborating its porous structure. Increasing the porosity of DPF decreases its strength and thermal conductivity. It was clarified how these characteristics affect the performance such as filtration characteristics, low pressure loss, maximum soot loading limit, and thermal response characteristics required for DPF. It was found that the basic characteristics of SiC such as high strength and high thermal conductivity play an important role in its high porosity.

In Europe, where diesel engine cars enjoy widely popularity, the major diesel-engine car manufacturers have already announced that they will equip their diesel engine vehicles with DPF systems. Silicon carbide(SiC) has good fundamental properties. And the crack problem during regeneration could be successfully controlled by using split-type DPF which consists of multiple filter segments. The functional characteristics were focused on. For DPF, a model test by which events that may actually occur on vehicles can be produced is said to have not yet been established. From this point of view, in this study, SiC-DPF functions are characterized and evaluated under a regeneration system, and their correlation is discussed.