EP0270990A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Regenerable filter for exhaust gases of an internal-combustion engine
Assignee: Iveco SpA
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Filing: 1987-12-02
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Granted: —
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Expires: 2007-12-02
Abstract
Abstract The filter comprises filtering means (21) 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 (26) of said filtering means (21), mutually insulated and cyclically and selectively supplied.
Inventors
- 👤 Giovanni Manfre'
- 👤 Angelo Giachello
- 👤 Francesco Cuniberti
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 02:05
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/0217; F01N3/0218; F01N3/022; F01N3/0222; F01N3/023; F01N3/027; F01N2330/00; F01N2330/10; F01N2370/00; F01N2370/22
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
132 words
A regenerable filter for the exhaust gases of an internal-combusion 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;and electric heating means apt to rise and residual combustion products to a temperature sufficiente to start their combusion; characterized in that said filtering means (3; 21; 43) comprise a plurality of portions (4; 26; 44) realized at least in part from an electrically conductive material and forming said heating means; said portions (4; 26; 44) being insulated one from another and electrically supplied in a selective and cyclic manner.
Claim 2
Dependent Claim
132 words
A regenerable filter for the exhaust gases of an internal-combusion 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;and electric heating means apt to rise and residual combustion products to a temperature sufficiente to start their combusion; characterized in that said filtering means (3; 21; 43) comprise a plurality of portions (4; 26; 44) realized at least in part from an electrically conductive material and forming said heating means; said portions (4; 26; 44) being insulated one from another and electrically supplied in a selective and cyclic manner.
Claim 3
Dependent Claim
18 words
A filter as claimed in claim 1, characterized in that said filtering means comprise a fabric (21; 43).
Claim 4
Dependent Claim
19 words
A filter as claimed in claim 2, characterized in that said fabric (21; 43) comprises conductive elements (26; 46).
Claim 5
Dependent Claim
37 words
A filter as claimed in claim 3, characterized in that said conductive elements comprise conductive threads (26) alternated with non-conductive threads (27); said conductive portions comprising groups of said threads (26) electrically connected in parallele one another.
Claim 6
Dependent Claim
17 words
A filter as claimed in claim 4, charac terized in that said conductive threads (26) are metallic.
Claim 7
Dependent Claim
19 words
A filter as claimed in claim 4, characterized in that said conductive threads (26) are of conductive ceramic material.
Claim 8
Dependent Claim
24 words
A filter as claimed in claim 6, characterized in that said conductive threads (26) are of non-conductive ceramic material plated with a conductive material.
Claim 9
Dependent Claim
24 words
A filter as claimed in anyone of the claims 4 to 7, characterized in that said threads (26, 27) comprise a plurality of microthreads.
Claim 10
Dependent Claim
22 words
A filter as claimed in claim 3, characterized in that said conductive elements are conductive fibres (46) dispersed in a non-conductive material.
Claim 11
Dependent Claim
17 words
A filter as claimed in claim 9, characterized in that said non-conductive material comprises a ceramic fabric.
Claim 12
Dependent Claim
17 words
A filter as claimed in claim 9, characterized in that said non-conductive material comprises a ceramic felt.
Claim 13
Dependent Claim
25 words
A filter as claimed in claim 9, characterized in that said non-conductive material comprises a plurality of felt layers superimposed and having porosities progressively differing.
Claim 14
Dependent Claim
18 words
A filter as claimed in claim 9, characterized in that said non-conductive material comprises a ceramic based paper.
Claim 15
Dependent Claim
62 words
A filter as claimed in anyone of the claims 2 to 13, characterized in that said fabric (21; 43) is arranged inside an annular chamber (38) of said filter (35) according to a closed polygonal line, the corners of which are angularly equidistant and are alternatives fixed to an inner wall (37) and an outer wall (36) of said annular chamber (38).
Claim 16
Dependent Claim
27 words
A filter as claimed in anyone of the claims 2 to 13, characterized in that said fabric (21) is pleated and fixed on a support element (51).
Claim 17
Dependent Claim
17 words
A filter as claimed in claim 15, characterized in that the support element (51) is spiral wound.
Claim 18
Dependent Claim
29 words
A filter as claimed in claim 15, characterized in that said support element is a slide arranged substantially on a central plane of an inner chamber of said filter.
Claim 19
Dependent Claim
29 words
A filter as claimed in claim 1, characterized in that said filtering means (3) comprise a plurality of honey-comb cells (4) made in a porous and electrically conductive material.
Claim 20
Dependent Claim
57 words
A filter as claimed in claim 18, characterized in that said cells (4) have a prismatic shape and are longitudinally divided by inner porous walls (6); said inner porous walls (6) separating one from another pairs of cavities (7) provided with respective apertures respectively communicating with said inlet duct and said outlet duct of said filter (1).
Claim 21
Dependent Claim
23 words
A filter as claimed in claim 18 or 19, characterized in that said cells (4) and said cavities (7) have a polygonal cross-section.
Claim 22
Dependent Claim
28 words
A filter as claimed in anyone of the preceding claims, characterized in that it comprises starting means for the combustion scattered on said filtering means (3; 21; 43).
Claim 23
Dependent Claim
46 words
A filter as claimed in claim 21, characterized in that said combustion starting means comprise a mixture of at least a metallic oxide and/or at least an oxygenated salt suited to produce said metallic oxide and at least a chloride of an alkaline or alkaline-earth metal.
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