US6082102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
NOx reduction system with a device for metering reducing agents
Assignee: Johnson Matthey Catalysts Germany GmbH
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Filing: 1998-09-25
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Granted: 2000-07-04
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Expires: 2018-09-25
Abstract
Abstract A NO x reduction system includes an SCR catalytic converter and a metering assembly for reducing agent. A control unit for the reduction system is integrated together with the actuators and sensors as a functional unit at the reducing agent container. This provides savings in terms of lines and plug-in connections, and relieves the burden on the control unit of the internal combustion engine.
Inventors
- 👤 Gerhard Wissler
- 👤 Gunther Pajonk
- 👤 Lothar Hofmann
- 👤 Manfred Weigl
- 👤 Wieland Mathes
- 👤 Ronald Neufert
- 👤 Klaus Wenzlawski
- 👤 Dietmar Weisensel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:03
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/206; F01N3/2066; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8696; B01D53/92; B01D53/94; B01D53/9445; B01D53/9454; B01D53/9495; F01N2610/00; F01N2610/02; F02; F02D; F02D41/00; F02D41/24; F02D41/26; F02D41/266; Y; Y02; Y02C; Y02C20/00; Y02C20/10; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
118 words
An NO x reduction system for an internal combustion engine operating with excess air, comprising: an SCR catalytic converter arranged in an exhaust system of an internal combustion engine; a reducing agent container for storing reducing agent; a metering device communicating with said reducing agent container for controlled delivery of the reducing agent into the exhaust system upstream of said SCR catalytic converter in a direction of exhaust gas flow in the exhaust system; and a control device assembly integrated in said reducing agent container for controlling the NO x reduction system, said control device assembly being a functional unit comprising a control device and associated sensors and actuators for storing, feeding, conditioning, and metering the reducing agent.
Claim 2
Dependent Claim
118 words
An NO x reduction system for an internal combustion engine operating with excess air, comprising: an SCR catalytic converter arranged in an exhaust system of an internal combustion engine; a reducing agent container for storing reducing agent; a metering device communicating with said reducing agent container for controlled delivery of the reducing agent into the exhaust system upstream of said SCR catalytic converter in a direction of exhaust gas flow in the exhaust system; and a control device assembly integrated in said reducing agent container for controlling the NO x reduction system, said control device assembly being a functional unit comprising a control device and associated sensors and actuators for storing, feeding, conditioning, and metering the reducing agent.
Claim 3
Dependent Claim
25 words
The device according to claim 1, which further comprises a serial interface connecting said control device to a control unit of the internal combustion engine.
Claim 4
Dependent Claim
35 words
The device according to claim 1, wherein said sensors include sensors assigned to said reducing agent container, and said control device contains signal-conditioning circuits receiving signals from said sensors assigned to said reducing agent container.
Claim 5
Dependent Claim
29 words
The device according to claim 3, wherein said sensors assigned to said reducing agent container include sensors for determining a fill level and a temperature of the reducing agent.
Claim 6
Dependent Claim
35 words
The device according to claim 1, which comprises sensors disposed at said SCR catalytic converter, and wherein said control device contains signal processing circuits for signals detected by said sensors at said SCR catalytic converter.
Claim 7
Dependent Claim
35 words
The device according to claim 5, wherein said sensors assigned to said SCR catalytic converter includes sensors for determining a temperature and a NO x content in the exhaust gas flow through the exhaust system.
Claim 8
Dependent Claim
22 words
The device according to claim 1, wherein said control device contains control circuits for said actuators assigned to said reducing agent container.
Claim 9
Dependent Claim
23 words
The device according to claim 7, wherein said actuators include actuators for a feed pump and a heating device for the reducing agent.
Claim 10
Dependent Claim
17 words
The device according to claim 7, wherein said control device contains control circuits for driving external actuators.
Claim 11
Dependent Claim
30 words
The device according to claim 7, which further comprises a metering valve for metering the reducing agent and a control circuit in said control device for driving said metering valve.
Claim 12
Dependent Claim
19 words
The device according to claim 1, wherein said exhaust system is an exhaust gas system of a diesel engine.
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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) | 2003-07-04 | 2004-01-03 | 2004-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-07-04 | 2008-01-03 | 2008-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-07-04 | 2012-01-03 | 2012-07-04 | $7700.00 | Window Closed / Lapsed |