US4872889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter system for the removal of engine emission particulates
Assignee: FEV Europe GmbH
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Filing: 1988-04-08
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Granted: 1989-10-10
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Expires: 2008-04-08
Abstract
Abstract A filter system for removing particulates from exhaust gases of an internal combustion engine, in particular a diesel engine, having at least one filter member formed by filter channels in the configuration of a honeycomb and made of a porous filter material, in which the region of the inlet openings of the filter channels open on the gas intake side, electrical resistance looped heating elements are arranged that are connected via a lead-in and a lead-out to a power supply. A secure positioning of the heating loops in the honeycomb is assured and contact errors are avoided. The loops of the resistance heating elements and/or the loop connections are received in grooves of the filter system in such a manner that they retain their pre-determined position despite vibrations, thermally-induced shape changes and the like. The grooves can be located in the filter member and/or in a cover plate overlying the inlet face of the filter member.
Inventors
- 👤 Gerhard Lepperhoff
- 👤 Georg Huthwohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:44
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/0222; F01N3/023; F01N3/027; F01N2330/00; F01N2330/06; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
175 words
A filter system for removing particulates from exhaust gases of an internal combustion engine, in particular a diesel engine, comprising at least one filter member in the configuration of a honeycomb of a porous filter material having generally parallel inlet and outlet passages for the gases, particulates for the gases being trapped on some of the surfaces of said inlet passages, said outlet passages being plugged closed at the gas intake side of said filter member, said inlet passages having inlet openings facing said gas intake side and being plugged closed at a side opposite said gas intake side, electric resistance heating means comprising a plurality of spaced apart heating elements each having loop-shaped wire portions extending into several of said inlet openings at said gas intake side for heating and igniting the trapped particulates, said filter member having a plurality of spaced apart grooves in said gas intake side wall thereof receiving connecting portions of said looped shaped wire portions said heating elements for firmly positioning said heating elements directly in said filter member.
Claim 2
Dependent Claim
175 words
A filter system for removing particulates from exhaust gases of an internal combustion engine, in particular a diesel engine, comprising at least one filter member in the configuration of a honeycomb of a porous filter material having generally parallel inlet and outlet passages for the gases, particulates for the gases being trapped on some of the surfaces of said inlet passages, said outlet passages being plugged closed at the gas intake side of said filter member, said inlet passages having inlet openings facing said gas intake side and being plugged closed at a side opposite said gas intake side, electric resistance heating means comprising a plurality of spaced apart heating elements each having loop-shaped wire portions extending into several of said inlet openings at said gas intake side for heating and igniting the trapped particulates, said filter member having a plurality of spaced apart grooves in said gas intake side wall thereof receiving connecting portions of said looped shaped wire portions said heating elements for firmly positioning said heating elements directly in said filter member.
Claim 3
Dependent Claim
38 words
The system according to claim 1, wherein said heating elements have free ends, connecting elements provided through which said free ends extend for connecting said free ends via a lead-in and a lead-out to an electrical power supply.
Claim 4
Dependent Claim
67 words
The system according to claim 2, wherein each said connecting element comprises a tube of electrically conducting material extending parallel to the direction of gas flow against the face of said filter member, one end of said tube being fixedly connecting to one of said lead-in and said lead-out and the other end of said tube being fixedly connected to said free end of said heating element.
Claim 5
Dependent Claim
23 words
The system according to claim 1, wherein said heating elements having connections between said loop-shaped portions, said connections being located in said grooves.
Claim 6
Dependent Claim
27 words
The system according to claim 4, wherein said connections are attached within said grooves, and said loop-shaped portions are unattached to the walls of said inlet passages.
Claim 7
Dependent Claim
64 words
The system according to claim 4 wherein said heating elements extend in a given direction, said grooves extending in a direction perpendicular to said given direction, and said connections between said loops comprising electrically conducting material filling said grooves so that the electrical resistance of said heating elements in the region of said grooves is lower than in the region of said inlet passages.
Claim 8
Dependent Claim
182 words
A filter system for removing particulates from exhaust gases of an internal combustion engine, in particular a diesel engine, comprising at least one filter member in the configuration of honeycomb of a porous filter material having generally parallel inlet and outlet passages for the gases, particulates for the gases being trapped on some of the surfaces of said inlet passages, said outlet passages being plugged closed at the gas intake side of said filter member, said inlet passages having inlet openings facing said gas intake side and being plugged closed at a side opposite said gas intake side, electric resistance heating means comprising a plurality of spaced apart heating elements each having loop-shaped wire portions extending into several of said inlet openings at said gas intake side for heating and igniting the trapped particulates, a cover plate of heat resistant, gas-permeable, electrically non-conducting material overlying said heating elements, an underside of said cover plate facing said heating elements having a plurality of spaced grooves for the reception of said heating elements for firmly positioning said heating elements directly in said cover plate.
Claim 9
Dependent Claim
182 words
A filter system for removing particulates from exhaust gases of an internal combustion engine, in particular a diesel engine, comprising at least one filter member in the configuration of honeycomb of a porous filter material having generally parallel inlet and outlet passages for the gases, particulates for the gases being trapped on some of the surfaces of said inlet passages, said outlet passages being plugged closed at the gas intake side of said filter member, said inlet passages having inlet openings facing said gas intake side and being plugged closed at a side opposite said gas intake side, electric resistance heating means comprising a plurality of spaced apart heating elements each having loop-shaped wire portions extending into several of said inlet openings at said gas intake side for heating and igniting the trapped particulates, a cover plate of heat resistant, gas-permeable, electrically non-conducting material overlying said heating elements, an underside of said cover plate facing said heating elements having a plurality of spaced grooves for the reception of said heating elements for firmly positioning said heating elements directly in said cover plate.
Claim 10
Dependent Claim
23 words
The system according to claim 7, wherein said heating elements have connections between said loop-shaped portions, said connections being located in said grooves.
Claim 11
Dependent Claim
26 words
The system according to claim 7, wherein said cover plate is arranged in the direction of flow of the exhaust gas upstream of said heating elements.
Claim 12
Dependent Claim
16 words
The system according to claim 7, wherein said cover plate material has a low thermal conductivity.
Claim 13
Dependent Claim
17 words
The system according to claim 7, wherein said cover plate has a grid structure defining flow channels.
Claim 14
Dependent Claim
17 words
The system according to claim 7, wherein said cover plate material is of a porous, ceramic foam.
Claim 15
Dependent Claim
38 words
The system according to claim 7, wherein said heating elements have free ends, connecting element provided through which said free ends extend for connecting said free ends via a lead-in and a lead-out to an electrical power supply.
Claim 16
Dependent Claim
67 words
The system according to claim 13, wherein each said connecting element comprises a tube of electrically conducting material extending parallel to the direction of gas flow against the face of said filter member, one end of said tube being fixedly connecting to one of said lead-in and said lead-out and the other end of said tube being fixedly connected to said free end of said heating element.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |