US4825651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device and process for separating soot or other impurities from the exhaust gases of an internal-combustion engine
Assignee: Bayerische Motoren Werke AG
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Filing: 1986-02-07
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Granted: 1989-05-02
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Expires: 2006-02-07
Abstract
Abstract A device and method for separating soot or other impurities from the exhaust gases of an internal-combustion engine, particularly a diesel internal-combustion engine, comprises a microwave source that is coupled to the intermediate section of the exhaust pipe that is constructed for the development of an electromagnetic field, an effective burning of the soot with a low flow resistance, the intermediate section being developed as a cavity resonator and at its exhaust gas inlet and exhaust gas outlet, is equipped with a metal grid, and an insert made of a dielectric material in the cavity resonator concentrates the exhaust gas flow in the area of high energy density of the electromagnetic field.
Inventors
- 👤 Herbert A. Puschner
- 👤 Johann Furtauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:53
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/80; H05B6/802; F; F01; F01N; F01N3/00; F01N3/01; F01N3/02; F01N3/021; F01N3/023; F01N3/027; F01N3/028; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
150 words
A device for eliminating soot or other impurities from an exhaust gas flow of an internal-combustion engine, comprising: an exhaust pipe including an intermediate section being formed as a cavity resonator having an exhaust gas inlet and an exhaust gas outlet and a respective outer section extending from each of the intermediate section exhaust gas inlet and exhaust gas outlet; a microwave source coupled to said intermediate section; a metal grid disposed in said exhaust gas inlet and a metal grid disposed in said exhaust gas outlet; and insert means made of a dielectric material for concentrating the exhaust gas flow in an area of high energy density of the electromagnetic field thereby at least partially eliminating the soot or other impurities during flow of the soot or other impurities through the intermediate section, wherein said intermediate section and insert means provide essentially resistance free flow of the exhaust gas.
Claim 2
Independent Claim
150 words
A device for eliminating soot or other impurities from an exhaust gas flow of an internal-combustion engine, comprising: an exhaust pipe including an intermediate section being formed as a cavity resonator having an exhaust gas inlet and an exhaust gas outlet and a respective outer section extending from each of the intermediate section exhaust gas inlet and exhaust gas outlet; a microwave source coupled to said intermediate section; a metal grid disposed in said exhaust gas inlet and a metal grid disposed in said exhaust gas outlet; and insert means made of a dielectric material for concentrating the exhaust gas flow in an area of high energy density of the electromagnetic field thereby at least partially eliminating the soot or other impurities during flow of the soot or other impurities through the intermediate section, wherein said intermediate section and insert means provide essentially resistance free flow of the exhaust gas.
Claim 3
Dependent Claim
19 words
A device according to claim 1, wherein the metal grids include honeycomb grids with a predetermined axial minimum length.
Claim 4
Dependent Claim
34 words
A device according to claim 2, wherein the metal grids project from the exhaust gas inlet and the exhaust gas outlet by a predetermined axial minimum length into the respective exhaust pipe outer section.
Claim 5
Dependent Claim
69 words
Device according to claim 1, wherein the exhaust gas inlet and the exhaust gas outlet are arranged at opposite end front wall and have a nominal width essentially the same as a width of each respective exhaust pipe outer section, and wherein the intermediate section includes a circumferential wall between the end walls having a circular cross-section with a larger nominal width than the respective exhaust pipe outer sections.
Claim 6
Dependent Claim
68 words
A device according to claim 1, wherein the resonator is developed and excited as an E 01n -resonator, n being 0, 1, 2 . . . , and wherein the insert includes an a pipe with a nominal width corresponding to a width of each respective exhaust pipe outer section and which extends from the inlet to the outlet in axial alignment with the exhaust pipe outer sections.
Claim 7
Dependent Claim
64 words
A device according to claim 1, wherein the resonator is developed and excited as an H 01m -resonator, m being 1, 2, 3 . . . , and wherein the insert is a cylinder having reduced cross-section and that is closed at its respective ends and that, for producing a flow channel with a ring cross-section, is inserted centrally and axially into the resonator.
Claim 8
Dependent Claim
14 words
A device according to claim 6, wherein the insert tapers conically at its ends.
Claim 9
Dependent Claim
60 words
A device according to claim 6, wherein a second dielectric insert as a pipe having a nominal width that is enlarged with respect to the diameter of the first insert and of the exhaust pipe outer section is arranged concentrically with respect to the first insert in the resonator, and forms the outside wall for the exhaust gas flow channel.
Claim 10
Dependent Claim
24 words
A device according to claim 1, wherein several resonators each having at least one dielectric insert are inserted in series in the exhaust pipe.
Claim 11
Dependent Claim
31 words
A device according to claim 9, wherein adjacent resonators are arranged bordering on one another and each have a joint front wall having an exhaust gas opening carrying the metal grid.
Claim 12
Dependent Claim
30 words
A device according to claim 10, wherein the several resonators for the microwave coupling have a feeding coupling means and in the joint front walls each have a coupling element.
Claim 13
Dependent Claim
20 words
A device according to claim 1, wherein several resonators in parallel to one another are inserted into the exhaust pipe.
Claim 14
Dependent Claim
16 words
A device according to claim 1, wherein the resonator is thermally decoupled from the exhaust pipe.
Claim 15
Dependent Claim
22 words
A device according to claim 1, wherein a coupling line leading to the microwave source is thermally decoupled from the microwave source.
Claim 16
Dependent Claim
15 words
A device according to claim 1, wherein the resonator is cooled by a cooling system.
Claim 17
Dependent Claim
20 words
A device according to claim 15, wherein the cooling system is connected with the coolant system of the internal-combustion engine.
Claim 18
Dependent Claim
22 words
A device according to claim 1, wherein the resonator is formed of a metallic material with a low coefficient of thermal expansion.
Claim 19
Dependent Claim
32 words
A device as in claim 1, wherein said intermediate section and insert means provide resistance free flow of the exhaust gas by providing for flow therethrough devoid of a filter or trap.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |