Burn-out type cleaning means for particulate filter of engine exhaust system
AssigneeCaterpillar Tractor Co.
InventorJohn M. Bailey
Life of this patent
Estimating the term…
Abstract
Apparatus for raising the temperature of internal combustion engine exhaust gases high enough to burn collected particulate material from particulate filter means (27/56) in the exhaust system. An electrical resistance heating element (37/71) which confronts only a small part of the inlet surface of particulate filter means (27/56) is moved relative to said inlet surface so as to progressively and cyclically burn the particulates from the filter means.
Claims9
In an engine exhaust particulate filter (10/53) including filter means (27/56) for trapping particulates as exhaust gas passes from an inlet surface (28b-29b/56a) to an opposite surface (28c-29c/56b) thereof, the improvement comprising:
- electrical heating element means (32/71) for heating the exhaust gas passing to a localized portion of said inlet surface (28b-29b/56a) of said filter means (27/56) to a level at which said gases ignite particulates trapped in the filter means (27/56);
- and drive means (35/77) for moving said electrical heating element means (37/71) confrontingly in immediate juxtaposition to said entire inlet surface (28b-29b/56a) so the locally heated exhaust gas progressively ignites the particulates trapped in the entire filter means (27/56) as said electrical hating element means (37/71) moves confrontingly over said inlet surface (28b-29b/56a).
In an engine exhaust particulate filter (10/53) including filter means (27/56) for trapping particulates as exhaust gas passes from an inlet surface (28b-29b/56a) to an opposite surface (28c-29c/56b) thereof, the improvement comprising:
- heating means (37/71) for heating the exhaust gas passing to a localized portion of said inlet surface (28b-29b/56a) of said filter means (27/56) to a level at which said gas ignites particulates trapped in the filter means (27/56);
- and
- drive means (37/77) for moving said heating means (37/71) confrontingly in immediate juxtaposition to said entire inlet surface (28b-29b/56a) so the locally heated exhaust gas progressively ignites the particulates trapped in the entire filter means (27/56).
Dependencies are inferred from the claim text.