| 摘要 |
Prior art trap regeneration devices employ one or two relatively large ceramic trap cores, and a regeneration cycle that burns off the soot in a direction that subjects the porous walls to excessive temperature spikes. Moreover, during regeneration it is normal to bypass dirty exhaust gas directly to the atmosphere. In a first embodiment the subject trap regeneration apparatus includes an electrical heating element and a reverse flow device for each of a plurality of relatively smaller trap cores arranged in a housing, with each reverse flow device constructed for directing a source of air at a controlled rate toward the normal second end of the trap core, heating the air, forcing the heated air through the trap core to the first end, and to controllably burn out particulate matter while the remaining trap cores are functioning to filter the exhaust gases in the normal flow direction. In a second embodiment a heater and reverse flow device is movably positioned before a selected one of the smaller trap cores and a reverse flow burnout method employed similar to the first embodiment. Preferably, the reverse flow device includes a choking orifice for controlling the rate of flow of the air to the selected trap core. |
