Patent US4516990A successfully refreshed from Google Patents.
US4516990A
Expired / Lapsed
US
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Method of removing soot from exhaust gases
Assignee: FILTEWERK MANN & HUMMEL HINDENBURGSTRASSE GmbH
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Filing: 1984-07-16
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Granted: 1985-05-14
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Expires: 2004-07-16
Abstract
Abstract A method of removing soot from the exhaust gases of internal combustion engines, especially of the diesel-type, using an exhaust filter which collects the soot and a dosing device which, when triggered by a pressure switch and a series-connected temperature switch, injects a dose of a combustion-inducing substance onto the soot layer with the aid of compressed air. The combustion-inducing substance consists of CuCl and NH 4 NO 3 which are stored as a mixture in a single container or as separate ingredients in two containers.
Inventors
- 👤 Hans Erdmannsdorfer
- 👤 Manfred Wagner
- 👤 Rudi Numrich
- 👤 Gerd Weyh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:56
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/42; B01D46/44; B01D46/46; B01D46/66; B01D46/80; B01D46/84; B01D53/00; B01D53/34; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/0231; F01N3/029; F01N3/0293; B01D2279/00; B01D2279/30; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A method of removing soot form the exhaust gas of an internal combustion engine, particularly of a diesel engine, comprising the steps of: filtering the soot particles from the exhaust gas by means of an exhaust filter which retains and collects the soot; during operation of the engine, form time to time burning off the collected soot to a gas which passes through the exhaust filter by adding to the soot a dose of a flowable combustion-inducing substance which lowers the soot ignition temperature and by also adding a supply of combustion air, the combustion-inducing substance being a mixture of copper(I) chloride and ammonium nitrate; monitoring the temperature inside the exhaust filter and using the presence of an operating temperature above a predetermined level as a precondition for the initiation of the burn-off step; and monitoring the accumulation of soot in the exhaust filter, in terms of the resultant increase in the flow resistance across the filter, and using the presence of a predetermined flow resistance as a trigger condition for the initiation of the burn-off step.
Claim 2
Independent Claim
177 words
A method of removing soot form the exhaust gas of an internal combustion engine, particularly of a diesel engine, comprising the steps of: filtering the soot particles from the exhaust gas by means of an exhaust filter which retains and collects the soot; during operation of the engine, form time to time burning off the collected soot to a gas which passes through the exhaust filter by adding to the soot a dose of a flowable combustion-inducing substance which lowers the soot ignition temperature and by also adding a supply of combustion air, the combustion-inducing substance being a mixture of copper(I) chloride and ammonium nitrate; monitoring the temperature inside the exhaust filter and using the presence of an operating temperature above a predetermined level as a precondition for the initiation of the burn-off step; and monitoring the accumulation of soot in the exhaust filter, in terms of the resultant increase in the flow resistance across the filter, and using the presence of a predetermined flow resistance as a trigger condition for the initiation of the burn-off step.
Claim 3
Dependent Claim
47 words
A soot-removing method as defined in claim 1, wherein the two ingredients of the combustion-inducing substance are powders; and the step of burning off the soot involves the additional steps of pre-mixing the two ingredient powders and storing them as a mixture in a single supply container.
Claim 4
Dependent Claim
48 words
A soot-removing method as defined in claim 1, wherein the two ingredients of the combustion-inducing substance are powders; and the step of burning off the soot involves the additional steps of storing the two ingredient powders in two separate supply containers and mixing them just prior to use.
Claim 5
Dependent Claim
28 words
A soot-removing method as defined in claim 1, wherein the step of monitoring the exhaust filter temperature uses as said precondition a temperature level of approximately 280° Celsius.
Claim 6
Dependent Claim
58 words
A soot-removing method as defined in claim 1, wherein the step of burning off the soot includes the steps of blowing compressed air into the exhaust filter, on its upstream side, thereby providing said supply of combustion air; and metering said dose of combustion-inducing substance into the flow of compressed air, before the latter enters the exhaust filter.
Claim 7
Dependent Claim
61 words
A soot-removing method as defined in claim 5, wherein the steps of burning and metering involve the use of an air supply line into which the combustion-inducing substance is metered by a dosing valve; and the method further involves the step of scavenging the air supply line downstream of the dosing valve with compressed air, after termination of the metering step.
Claim 8
Dependent Claim
45 words
A soot-removing method as defined in claim 1, wherein the step of burning off the soot involves the use of a combustion-inducing substance which is a mixture of copper(I) chloride and ammonium nitrate, at a weight ratio between 1 to 4 and 1 to 1.
Claim 9
Dependent Claim
47 words
A soot-removing method as defined in claim 7, wherein the two ingredients of the combustion-inducing substance are powders; and the step of burning off the soot involves the additional steps of pre-mixing the two ingredient powders and storing them as a mixture in a single supply container.
Claim 10
Dependent Claim
48 words
A soot-removing method as defined in claim 7, wherein the two ingredients of the combustion-inducing substance are powders; and the step of burning off the soot involves the additional steps of storing the two ingredient powders in two separate supply containers and mixing them just prior to use.
References Cited (Backward Citations)
US4436535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |