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US 5,207,807 AGranted
Regenerable filter for exhaust gases of an internal-combustion engine
AssigneeIveco Fiat S.p.A.
InventorsGiovanni Manfre, Angelo Giachello, Francesco Cuniberti
Life of this patent
Estimating the term…
Abstract
The filter comprises filtering means suited to intercept the residual combustion products, and heating means suited to bring said residues to a combustion temperature; the heating means comprise a plurality of electrically conductive portions of said filtering means, mutually insulated and cyclically and selectively supplied.
Claims20
A regenerable filter for the exhaust gases of an internal-combustion engine, of the type comprising:
- an outer casing provided with at least an inlet duct and at least an outlet duct, apt to be placed in series with an exhaust pipe of said engine;
- filtering means housed into said outer casing and apt to intercept the residual combustion products in said exhaust gases;
- electric heating means apt to rise said residual combustion products to a temperature sufficient to start their combustion;
- and control means for electrically supplying said electric heating means;
- wherein said filtering means (21, 43) is formed of a filtering fabric;
- said electric heating means including a set of conductive fibers (26, 46) of electrically conductive material inserted in said filtering fabric;
- elongated insulating elements (27, 45) being provided to define a plurality of elongated portions (26, 44) of said filtering fabric insulated from one another;
- said portions (26, 44) being connected to said control means (15, 16) as to be electrically supplied in a selective and cyclic manner.
5 more elements
A regenerable filter for the exhaust gases of an internal-combustion engine, of the type comprising:
- an outer casing provided with at least one inlet duct and one outlet duct, apt to be placed in series with the exhaust pipe of said engine;
- filtering means housed into said outercasing and formed of a set of pairs of cavities having walls made of porous material, each one of said cavities being provided with an open end and a closed end, one cavity of each pair being provided with its open end communicating with said inlet duct, and the other cavity of each pair being provided with its open end communicating with said outlet duct, whereby said porous material is apt to intercept the residual combustion products in said exhaust gases;
- electrical heating means apt to rise said residual combustion products to a temperature sufficient to start their combustion;
- and control means for electrically supplying said electric heating means;
- wherein:
- said porous material is electrically conductive, said heating means including said walls (5, 6);
- said filtering means are formed by a plurality of elongated prismatic honey-comb cells (4) each one including at least one pair of said cavities (7), said plurality of cells (4) is arranged in a reticulate structure (12) defined by two orders of intersecting flat walls (13) made of non-conductive material to insulate said cells from each other;
- and the two ends (9, 10) of said cavities (7) in each cell (4) is electrically connected to said control means (15, 16) to be electrically supplied in a selective and cyclical manner.
5 more elements
Dependencies are inferred from the claim text.