EP1183454A1 - PROCEDE DE COMMANDE DE LA REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx - Google Patents

PROCEDE DE COMMANDE DE LA REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx

Info

Publication number
EP1183454A1
EP1183454A1 EP00931213A EP00931213A EP1183454A1 EP 1183454 A1 EP1183454 A1 EP 1183454A1 EP 00931213 A EP00931213 A EP 00931213A EP 00931213 A EP00931213 A EP 00931213A EP 1183454 A1 EP1183454 A1 EP 1183454A1
Authority
EP
European Patent Office
Prior art keywords
regeneration
comparison value
measure
threshold value
exhaust gas
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
EP00931213A
Other languages
German (de)
English (en)
Other versions
EP1183454B1 (fr
Inventor
Ekkehard Pott
Axel König
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.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP1183454A1 publication Critical patent/EP1183454A1/fr
Application granted granted Critical
Publication of EP1183454B1 publication Critical patent/EP1183454B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F01N3/0842—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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • F02D41/028—Desulfurisation of NOx traps or adsorbent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • F02D41/1463—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases downstream of exhaust gas treatment apparatus
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/03—Monitoring or diagnosing the deterioration of exhaust systems of sorbing activity of adsorbents or absorbents
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]

Definitions

  • the invention relates to a method for controlling a regeneration of at least one NO x storage catalytic converter arranged in an exhaust gas duct of an internal combustion engine with the features mentioned in the preamble of claim 1.
  • NO x storage which can also be combined with the catalyst for a NO x storage catalyst.
  • the NO x storage catalyst absorbs the NO x as nitrate, until it does a NO x desorption temperature and / or a NO x storage capacity is exceeded.
  • NO x regeneration It is therefore known to regenerate the NO x storage catalytic converter in regular cycles (NO x regeneration).
  • NO x regeneration there is a brief change to a working mode with ⁇ ⁇ 1.
  • the stored NO x is desorbed again and reduced on the catalyst with the reducing agents.
  • a need for regeneration can be made dependent on individual operating parameters that can be determined directly by suitable measuring devices. For example, it is known from DE 197 29 676 A1 to initiate the regeneration as a function of certain limit temperatures. A more complex model for such a control can be found in DE 197 16 275 C1.
  • the current driving situation, a loading condition and a current lambda value can be taken into account.
  • the conditions can be linked to certain parameters during the regeneration.
  • Reversible damage can occur, for example, by covering the catalyst with a condensate or soot.
  • SO x is formed during combustion of sulfur-containing fuel, which, like NO x , is absorbed by the accumulator.
  • Storage of the SO x as sulfate leads, among other things, to a reduction in the NO x storage capacity, but can also lead to damage to the catalyst in the long term, for example due to sulfite formation.
  • sulfate grain formation during absorption can lead to tension within the structure of a NO x storage catalytic converter, which can result in irreversible damage to the NO x storage catalytic converter.
  • the need for desulfurization can be determined on the basis of parameters characterizing a current catalyst state, such as a degree of sulfurization, a current lambda value or a catalyst temperature.
  • the degree of sulfurization can be determined, for example, as a function of a NO x concentration downstream of the NO x storage catalytic converter.
  • Component-specific sensors such as NO x sensors, are suitable for detecting the NO x concentration.
  • a method can be found in DE 198 37 074 A1 with which a regulation of an air-fuel ratio is influenced during a desulfurization phase.
  • an actual-target comparison of an oxygen concentration takes place during the desulfurization and from an error signal generated therefrom, the fuel concentration supplied during the desulfurization is increased again.
  • a disadvantage of the known methods is poor coordination of a sequence of individual regeneration measures. As a result, increased fuel consumption can occur and it is not possible to select the regeneration measure in accordance with a current catalytic converter condition.
  • Object of the method according to the invention is to provide a functionality of the NOx - monitor storage catalyst with respect to the NO x storage capacity and catalytic activity and to adapt the regeneration measure the current state of the catalyst.
  • this object is achieved by a method for controlling a regeneration of at least one NO x storage catalytic converter arranged in an exhaust gas duct of an internal combustion engine with the features of claim 1.
  • the regeneration measure is selected as a function of a regeneration measure that may have been carried out beforehand
  • the comparison value is determined again during or after the regeneration measure. If the comparison value is exceeded, at least one further regeneration measure is taken. In addition, it is conceivable, depending on the comparison value, to vary the content of reducing agents in the exhaust gas during the NO x or SO x regeneration. This allows the current catalytic converter state to be taken into account in a simple manner.
  • Figure 1 shows an arrangement of a catalyst system in an exhaust duct of an internal combustion engine
  • Figure 2 is a block diagram for controlling a regeneration
  • Figure 3 is a block diagram for controlling a regeneration of a
  • the catalytic converter system 10 comprises a NO x storage catalytic converter 16 and a pre-catalytic converter 18 as well as the temperature sensors 22.
  • gas sensors 19, 20, 21 are assigned to the catalyst system, which can detect a gas content of a gas component in the exhaust gas. Lambda sensors or component-specific sensors, for example, are suitable.
  • the gas sensor 21 enables at least one detection of a NO x concentration and is thus a NO x sensor.
  • a working mode of the internal combustion engine 14 can be regulated by means of an engine control unit 24. If, for example, a working mode with ⁇ ⁇ 1 (rich atmosphere) is desired, an oxygen concentration in an intake manifold 26 must be reduced before a fuel-air mixture is combusted. This also increases the content of reducing agents such as CO, HC and H2 in the exhaust gas compared to an oxygen content.
  • a working mode can be set by reducing a volume flow of intake air by means of a throttle valve 28 and by simultaneously supplying low-oxygen exhaust gas via an exhaust gas reflux valve 30.
  • Gaseous pollutants such as CO, HC, NO x or SO x are formed in varying proportions during a combustion process.
  • the reducing agents can be oxidized by oxygen on the pre-catalyst 18. With sufficient oxygen concentration, a complete or extensive implementation is possible under almost all working modes.
  • absorbed SO x is stored in the form of sulfate in the NO x storage catalytic converter 16, although reversibility of this storage process, in contrast to the storage of NO x, requires significantly higher temperatures.
  • a minimum desulfurization temperature and a lambda value ⁇ 1 must therefore be available for desulfurization (SO x regeneration parameter).
  • An exhaust gas temperature can be increased and the NO x storage catalytic converter 16 can be heated to the minimum temperature by at least temporarily influencing at least one operating parameter of the internal combustion engine 14.
  • a NO x concentration in the exhaust gas behind the NO x storage catalytic converter 16 is continuously detected. This concentration is compared with a target NO x concentration and a comparison value is formed in accordance with a deviation of the concentration from the target concentration. If the comparison value exceeds a predefinable threshold value, a regeneration measure is taken.
  • the regeneration measure includes SO x regeneration (desulphurization), NO x regeneration or an increase in the exhaust gas temperature in order to eliminate an occupation of the storage catalytic converter with condensate or soot. Important when making a selection the regeneration measure is to match this to a regeneration measure that may have been carried out beforehand. In this way, individual regeneration measures can be coordinated and control of the regeneration of the storage catalytic converter 16 can be carried out much more effectively. If the comparison value continues to exceed the threshold value after the regeneration measure has been carried out, a further regeneration measure is selected and carried out.
  • FIG. 2 shows a block diagram for controlling the regeneration of the NO x storage catalytic converter 16 in a rich atmosphere.
  • a NO x regeneration of the NO x storage catalytic converter 16 can already be carried out in such an atmosphere. If the comparison value in a comparison 40 is below the threshold value, no further measure (42) is taken. However, if the comparison value reaches the threshold value, an operating parameter of the internal combustion engine 14 is influenced at least temporarily in such a way that the exhaust gas temperature is increased (exhaust gas temperature increase 44). A comparison 40 of the comparison value and the threshold value is then carried out again. If the comparison value continues to exceed the threshold value, irreversible damage to the NO x storage catalytic converter 16 can be concluded.
  • comparison 40 of the comparison value with the threshold value takes place and, if necessary, NO x regeneration 48 is initiated as a regeneration measure. If, in a subsequent comparison 40, the comparison value is again greater than the threshold value, a second NO x regeneration 50 is initiated. After the second NO x regeneration 50 has ended, the comparison value and threshold value are again compared. If the regeneration measure was successful, no further measures 42 are taken.
  • an adaptation 52 of a content of reducing agents in the exhaust gas during NO x regeneration can be carried out anew depending on the previously detected comparison value, for example in order to compensate for minor irreversible damage to the NO x storage catalytic converter 16.
  • a first SO x regeneration 54 is initiated and possibly also a second SO x regeneration 56 subsequently.
  • a comparison 40 of the comparison value and threshold value then takes place again. If the comparison value is again below the threshold value, an adjustment of a reducing agent content during SO x regeneration can be carried out analogously to the method during the NO x regeneration (adaptation 58).

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

L'invention concerne un procédé de commande de la régénération d'au moins un catalyseur accumulateur de NOx se trouvant dans le canal d'échappement d'un moteur à combustion interne. La concentration en NOx d'un gaz d'échappement est déterminée par un capteur de NOx se trouvant en aval du catalyseur accumulateur de NOx. L'invention se caractérise en ce: (a) la concentration en NOx mesurée après le catalyseur accumulateur de NOx est comparée avec une concentration en NOx théorique et une valeur de comparaison est établie en fonction de la différence entre cette concentration en NOx mesurée et la concentration en NOx théorique; (b) lorsque cette valeur de comparaison dépasse une valeur seuil pouvant être prédéterminée, une opération de régénération est entreprise, opération durant laquelle on peut jouer au moins temporairement sur l'un au moins des paramètres de fonctionnement du moteur à combustion interne (14); et (c) l'opération de régénération est choisie en fonction d'une éventuelle opération de régénération préalable.
EP00931213A 1999-05-21 2000-05-13 PROCEDE DE COMMANDE DE LA REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx Expired - Lifetime EP1183454B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19923498A DE19923498A1 (de) 1999-05-21 1999-05-21 Verfahren zur Steuerung einer Regeneration eines NOx-Speicherkatalysators
DE19923498 1999-05-21
PCT/EP2000/004335 WO2000071878A1 (fr) 1999-05-21 2000-05-13 PROCEDE DE COMMANDE DE LA REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx

Publications (2)

Publication Number Publication Date
EP1183454A1 true EP1183454A1 (fr) 2002-03-06
EP1183454B1 EP1183454B1 (fr) 2004-04-28

Family

ID=7908846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00931213A Expired - Lifetime EP1183454B1 (fr) 1999-05-21 2000-05-13 PROCEDE DE COMMANDE DE LA REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx

Country Status (4)

Country Link
EP (1) EP1183454B1 (fr)
JP (1) JP2003500595A (fr)
DE (2) DE19923498A1 (fr)
WO (1) WO2000071878A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10004330A1 (de) * 2000-02-01 2001-08-02 Deutz Ag Programmierbare Steuer- und Regelelektronik für eine Brennkraftmaschine
DE60116278T2 (de) * 2001-06-28 2006-08-03 Isuzu Motors Ltd. Vorrichtung zur Reinigung des Abgases mit einem Stickoxidfallekatalysator
JP3800080B2 (ja) * 2001-11-30 2006-07-19 トヨタ自動車株式会社 内燃機関の排気浄化装置
DE10249610B4 (de) * 2002-10-18 2010-10-07 Volkswagen Ag Verfahren und Vorrichtung zur Steuerung eines NOx-Speicherkatalysators
DE10318210B4 (de) * 2003-04-22 2006-06-14 Siemens Ag Betriebsverfahren für eine Brennkraftmaschine mit einem Vorkatalysator und einem Speicherkatalysator
DE10331331B4 (de) * 2003-07-10 2012-03-01 Volkswagen Ag Verfahren zum Betreiben einer Brennkraftmaschine
DE102005050517A1 (de) 2005-10-21 2007-04-26 Umicore Ag & Co. Kg Verfahren zum Betreiben eines Stickoxid-Speicherkatalysators an einem Dieselmotor

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2985638B2 (ja) * 1993-10-18 1999-12-06 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP2888124B2 (ja) * 1994-01-27 1999-05-10 トヨタ自動車株式会社 内燃機関の排気浄化装置
DE19543219C1 (de) * 1995-11-20 1996-12-05 Daimler Benz Ag Verfahren zum Betreiben eines Dieselmotors
JPH1071325A (ja) * 1996-06-21 1998-03-17 Ngk Insulators Ltd エンジン排ガス系の制御方法および触媒／吸着手段の劣化検出方法
DE19705335C1 (de) * 1997-02-12 1998-09-17 Siemens Ag Verfahren zur Regeneration eines Speicherkatalysators
DE19716275C1 (de) * 1997-04-18 1998-09-24 Volkswagen Ag Verfahren zur Stickoxidreduzierung im Abgas einer Brennkraftmaschine
DE19729676C5 (de) * 1997-07-11 2004-04-15 Ford Global Technologies, LLC (n.d.Ges.d. Staates Delaware), Dearborn Verfahren zum Betrieb eines Verbrennungsmotors zum Schutz einer Abgasbehandlungseinrichtung
US5983627A (en) * 1997-09-02 1999-11-16 Ford Global Technologies, Inc. Closed loop control for desulfating a NOx trap
DE19744409C2 (de) * 1997-10-08 2001-11-08 Ford Global Tech Inc Verfahren zur Regeneration einer Stickoxidfalle im Abgassystem eines Verbrennungsmotors sowie Vorrichtung zur Durchführung des Verfahrens
DE19801815A1 (de) * 1998-01-19 1999-07-22 Volkswagen Ag Mager-Regeneration von NOx-Speichern
DE19830829C1 (de) * 1998-07-09 1999-04-08 Siemens Ag Verfahren zur Regeneration eines NOx-Speicherkatalysators

Non-Patent Citations (1)

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Title
See references of WO0071878A1 *

Also Published As

Publication number Publication date
DE50006263D1 (de) 2004-06-03
EP1183454B1 (fr) 2004-04-28
DE19923498A1 (de) 2000-11-23
WO2000071878A1 (fr) 2000-11-30
JP2003500595A (ja) 2003-01-07

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