EP0931922A3 - Method and apparatus to purify the exhaust gas of an internal combustion engine - Google Patents

Method and apparatus to purify the exhaust gas of an internal combustion engine Download PDF

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Publication number
EP0931922A3
EP0931922A3 EP98123165A EP98123165A EP0931922A3 EP 0931922 A3 EP0931922 A3 EP 0931922A3 EP 98123165 A EP98123165 A EP 98123165A EP 98123165 A EP98123165 A EP 98123165A EP 0931922 A3 EP0931922 A3 EP 0931922A3
Authority
EP
European Patent Office
Prior art keywords
engine
exhaust gas
internal combustion
combustion engine
lean
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98123165A
Other languages
German (de)
French (fr)
Other versions
EP0931922B1 (en
EP0931922A2 (en
Inventor
Walter Boegner
Günter Dr. Karl
Bernd Dr. Krutzsch
Christof Dr. Schön
Dirk Voigtländer
Günter Wenninger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0931922A2 publication Critical patent/EP0931922A2/en
Publication of EP0931922A3 publication Critical patent/EP0931922A3/en
Application granted granted Critical
Publication of EP0931922B1 publication Critical patent/EP0931922B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/085—Sulfur or sulfur oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0878—Bypassing absorbents or adsorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

Ein Verfahren zum Betreiben eines Verbrennungsmotors mit einer Motorsteuerung, die einen Wechsel zwischen Mager-Betrieb und Fett-Betrieb des Verbrennungsmotors ermöglicht, und mit einer Abgasreinigungseinrichtung, bei der im Abgasstrang nach dem Motor nacheinander eine λ-Sonde, ein SOx-Speicher-Katalysator und ein NOx-Speicher-Katalysator angeordnet sind, soll die für eine Desulfatisierung notwendige Abgaszusammensetzung und Abgastemperatur mit technisch einfachen Maßnahmen bereitstellen. Dies wird dadurch erzielt, daß zu Beginn der Desulfatisierung von Mager- auf Fett-Betrieb des Motors gewechselt wird, daß mit Hilfe einer steuerbaren Sekundärluftzuführung nach dem Motor und vor der λ-Sonde Sekundärluft in den Abgasstrang eingebracht wird, wobei ein vorbestimmter λ-Wert der mit Sekundärluft gemischten Abgase und mittels Temperatursensor im SOx-Speicher-Katalysator eine vorbestimmte Temperatur eingestellt wird, und daß am Ende der Desulfatisierung von Fett- auf Mager-Betrieb des Motors umgestellt wird.

Figure 00000001
A method for operating an internal combustion engine with an engine control system that enables a change between lean operation and rich operation of the internal combustion engine, and with an exhaust gas purification device, in which a λ probe, an SO x storage catalytic converter, is installed in the exhaust line after the engine and a NO x storage catalytic converter are arranged to provide the exhaust gas composition and exhaust gas temperature necessary for desulfation with technically simple measures. This is achieved by changing from lean to rich operation of the engine at the beginning of the desulphation, that secondary air is introduced into the exhaust line with the aid of a controllable secondary air supply after the engine and before the λ probe, with a predetermined λ value the exhaust gases mixed with secondary air and by means of a temperature sensor in the SO x storage catalytic converter, a predetermined temperature is set, and that at the end of the desulfurization, the engine is switched from lean to lean operation.
Figure 00000001
EP98123165A 1998-01-24 1998-12-04 Method and apparatus to purify the exhaust gas of an internal combustion engine Expired - Lifetime EP0931922B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19802631 1998-01-24
DE19802631A DE19802631C1 (en) 1998-01-24 1998-01-24 Method and device for cleaning exhaust gases from an internal combustion engine

Publications (3)

Publication Number Publication Date
EP0931922A2 EP0931922A2 (en) 1999-07-28
EP0931922A3 true EP0931922A3 (en) 2000-04-26
EP0931922B1 EP0931922B1 (en) 2001-10-24

Family

ID=7855535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98123165A Expired - Lifetime EP0931922B1 (en) 1998-01-24 1998-12-04 Method and apparatus to purify the exhaust gas of an internal combustion engine

Country Status (4)

Country Link
US (2) US6119450A (en)
EP (1) EP0931922B1 (en)
JP (1) JPH11280456A (en)
DE (2) DE19802631C1 (en)

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Also Published As

Publication number Publication date
EP0931922B1 (en) 2001-10-24
JPH11280456A (en) 1999-10-12
DE19802631C1 (en) 1999-07-22
US6318073B1 (en) 2001-11-20
EP0931922A2 (en) 1999-07-28
US6119450A (en) 2000-09-19
DE59805965D1 (en) 2002-11-21

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