EP1098694B1 - PROCEDE DE REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx - Google Patents

PROCEDE DE REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx Download PDF

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Publication number
EP1098694B1
EP1098694B1 EP99942726A EP99942726A EP1098694B1 EP 1098694 B1 EP1098694 B1 EP 1098694B1 EP 99942726 A EP99942726 A EP 99942726A EP 99942726 A EP99942726 A EP 99942726A EP 1098694 B1 EP1098694 B1 EP 1098694B1
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Prior art keywords
regeneration
threshold value
nox
value
catalytic converter
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Expired - Lifetime
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EP99942726A
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German (de)
English (en)
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EP1098694A1 (fr
Inventor
Hong Zhang
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Siemens AG
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Siemens AG
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    • 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
    • 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
    • F02D41/14—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
    • F02D41/1454—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 oxygen content or concentration or the air-fuel ratio
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/12—Condition responsive control

Definitions

  • the invention relates to a method for the regeneration of a NOx storage catalytic converter according to the preamble of the main claim.
  • NOx storage catalytic converters are used for this. Due to their coating, these NOx storage catalytic converters are able to absorb NOx compounds from the exhaust gas that arise during lean combustion during a storage phase. During a regeneration phase, the absorbed or stored NOx compounds are converted into harmless compounds with the addition of a reducing agent. CO, H 2 and HC (hydrocarbons) can be used as reducing agents for lean-burn gasoline internal combustion engines. These are generated by briefly operating the internal combustion engine with a rich mixture and made available to the NOx storage catalytic converter as exhaust gas components, as a result of which the stored NOx compounds in the catalytic converter are broken down.
  • the efficiency of such a NOx storage catalytic converter essentially depends on optimal regeneration. If the amount of regeneration agent is too small, the stored NOx is not broken down sufficiently, as a result of which the efficiency with which NOx is absorbed from the exhaust gas deteriorates. If the amount of regenerant is too high, optimal NOx conversion rates are achieved, but an inadmissibly high emission of reducing agent occurs. The optimal amount of regenerant fluctuates over the life of a vehicle. The possible cause for this can be the change in the NOx mass flow emitted by the internal combustion engine.
  • German patent application DE 197 05 335 by the same applicant is a process for triggering sulfate regeneration described for a NOx storage catalyst in which a sulfate regeneration phase at predetermined times is carried out.
  • a sulfate regeneration phase at predetermined times is carried out.
  • EP 0 597 106 A1 describes a method for regeneration a NOx storage catalytic converter is known, in which the NOx storage catalytic converter amount of NOx compounds absorbed in Dependency on operating data of the internal combustion engine is calculated becomes. When a predetermined limit is exceeded of NOx stored in the NOx storage catalytic converter becomes one Regeneration phase initiated. This way, however a reliable compliance with the exhaust emission limit values not guaranteed.
  • DE 195 11 548 A1 describes a method and a device for nitrogen oxide reduction in the exhaust gas of an internal combustion engine known.
  • the internal combustion engine can alternate in lean operation and in stoichiometric or enrichment operation be driven.
  • the nitrogen oxides are in the Lean operating phases recorded by an adsorber, which in regenerates the stoichiometric or enrichment phases becomes.
  • the content of hydrocarbons in the exhaust gas, Carbon monoxides or nitrogen oxides downstream of the nitrogen oxide adsorber is measured and then in each case to a stoichiometric or enrichment operating phase switched if the measured hydrocarbon and carbon monoxide content exceeds the specified level or if the measured nitrogen oxide content falls below a predetermined level.
  • This is a Corresponding hydrocarbon, carbon monoxide or nitrogen oxide sensor arranged in the exhaust pipe downstream of the adsorber, wherein the sensor information is a device for Controlling the fuel / air ratio.
  • US 5,554,269 describes the construction of a NOx sensor described for internal combustion engine exhaust. A Evaluation of the signal supplied by this NOx sensor for setting an optimal amount of regeneration agent for a NOx nitrogen oxide adsorber is not addressed.
  • NOx storage catalytic converter a NOx sensor is arranged downstream of the catalyst.
  • a NOx sensor is for example from N. Kato et al., "Performance of Thick Film NOx Sensor on Diesel and Gasoline Engines", Society of Automotive Engineers, publ. No.970858 known.
  • the invention has for its object to provide a method with the regeneration of a NOx storage catalytic converter so that it operates with optimal efficiency becomes.
  • the amount of regenerant to be supplied to the NOx storage catalyst adapted to the optimal value.
  • Storage capacity preferably a sulfate regeneration be performed.
  • FIG. 1 shows an internal combustion engine in the form of a block diagram with exhaust gas aftertreatment system in which the process is applied. Only the parts and components are included shown that are necessary for understanding the invention.
  • An internal combustion engine 10 has an intake tract 11 and one Exhaust tract 12 on.
  • a fuel metering device present, of which only one injector 13 is shown schematically.
  • a NOx storage catalytic converter 15 In the exhaust tract 12 there is one Precat lambda sensor 14, a NOx storage catalytic converter 15 and a NOx sensor 16 is provided downstream thereof.
  • the NOx sensor 16 With help the pre-cat lambda sensor 14 becomes the air / fuel ratio determined in the exhaust gas upstream of the NOx storage catalytic converter 15.
  • the NOx sensor 16 is used, among other things, for checking of the NOx storage catalyst 15.
  • Operation of the internal combustion engine 10 is regulated by an operating control device 17, which has a memory 18 in which, among other things A plurality of threshold values are stored.
  • the operating control unit 17 is via a schematically represented data and control line 19 with further sensors and actuators connected.
  • the NOx sensor 16 present downstream of the NOx storage catalytic converter 15 is an amperometric sensor. It is shown in more detail in a schematic sectional illustration in FIG. 4 under reference number 34. It consists of a solid electrolyte 26, for example ZrO 2, and contains the exhaust gas to be measured via a diffusion barrier 33. The exhaust gas diffuses through the diffusion barrier 33 into a first measuring cell 20. The oxygen content in the measuring cell 20 is measured by means of a first Nernst voltage V0 between a first electrode 21 and a reference electrode 29 exposed to ambient air. The first electrode 21 can also be made in several parts or with multiple taps. Both electrodes 21, 29 are conventional platinum electrodes. The reference electrode 29 is arranged in an air duct 28, into which ambient air passes through an opening 27.
  • the measured value of the first Nernst voltage V0 is used to to set a control voltage Vp0.
  • the control voltage Vp0 drives a first oxygen ion pump current Ip0 through the Solid state electrolytes 26 between the first electrode 21 and an outer electrode 22.
  • the one with a broken line shown control intervention of the first Nernst voltage V0 to the control voltage Vp0 has the consequence that the oxygen-ion pumping current Ip0 is set so that in the first Measuring cell 20 a certain oxygen concentration or certain oxygen partial pressure is present.
  • the first measuring cell 20 is over a further diffusion barrier 23 connected to a second measuring cell 24. Through this Diffusion barrier 23 diffuses this in the first measuring cell 20 existing gas. Due to the diffusion, the second measuring cell 24 a correspondingly lower, second oxygen concentration or oxygen partial pressure. This second oxygen concentration is again via a Nernst voltage V1 between a second electrode 25, the is also a conventional platinum electrode, and the reference electrode 29 measured, and to regulate a second Oxygen ion pumping current Ip1 used. The second oxygen-ion pumping current Ip1 out of the first measuring cell 20 flows from the second electrode 25 through the solid electrolyte 26 through to the outer electrode 22. With the help of second Nernst voltage V1 becomes the second oxygen-ion pumping current Ip1 adjusted so that in the second measuring cell 24th a certain, low, second oxygen concentration is present.
  • U second measuring cell RT / (4F). (Ln P O2, ambient air - ln P 02, second measuring cell ) where P 02, ambient air / second measuring cell is the oxygen partial pressure in the ambient air or the second measuring cell.
  • This relationship describes the two-point behavior of one Lambda probe.
  • This differential voltage between the outer electrode 22 and the reference electrode 29 is used as the output signal US for the process for the regeneration of a NOx storage catalytic converter used.
  • Measurement error in the voltage in the first measuring cell 20 can advantageously be corrected.
  • advantageously Correction of the output signal US with regard to the temperature of the sensor 34 take place.
  • FIG. 2 shows the time course of the output signal US of the NOx sensor 16 during the regeneration phase of the NOx storage catalytic converter 15. Further in this illustration the course of the pre-cat lambda setpoint LAMSOLL is drawn.
  • the internal combustion engine 10 is operated lean again.
  • the output signal US is approximately 0.03 V. At the beginning During the regeneration phase, this voltage rises continuously on. The lambda value drops towards the end of the regeneration phase UL on the NOx sensor 16 downstream of the NOx storage catalytic converter 15 under 1 and the output signal US rises steeply. UL later rises back to lean values Mix and US drops again.
  • a first sum value FL1 is made with a certain frequency (e.g. 100 Hz) sampled output signal US from the beginning of the regeneration phase until a threshold value SW is exceeded (e.g. 0.25 V). This total value corresponds to that with the Reference number FL1 in Fig. 3 marked area.
  • a threshold value SW e.g. 0.25 V.
  • This total value corresponds to that with the Reference number FL1 in Fig. 3 marked area.
  • second sum value FL2 is sampled from the one with the same frequency Output signal US from exceeding the threshold SW until the threshold falls below again SW calculated.
  • This total value corresponds to that with the area marked with the reference symbol FL2 in FIG. 3.
  • faces FL1 and FL2 instead of summation also be formed through continuous integration.
  • the optimal amount of regenerant was the NOx storage catalyst 15 then supplied when the total value FL2 is greater than a threshold value SW1 and the total value FL2 between a lower threshold USW2 and an upper one Threshold value OSW2 is.
  • Step S1 the sum values or areas FL1 and FL2 calculated and buffered.
  • the memory 18 is then of the operating control device 17, the threshold value SW1 for the Sum value FL1 and the threshold values USW2 and OSW2 for the Total value FL2 read out (step S2).
  • step S3 it is checked whether the amount of regenerant supplied is optimal. This is the case if the Sum value FL1 lies above the threshold value SW1 and the sum value FL2 from the lower threshold USW2 and from the upper Threshold OSW2 limited range. Are these two Conditions are met (step S4), there is no intervention necessary, the amount of regenerant used was optimal and the process is ended (step S11).
  • step S3 it was in the regeneration phase the NOx storage catalyst 15 a non-optimal amount of regenerant fed.
  • FL1, FL2 can now be determined whether the amount of regenerant must be enlarged or reduced in order to achieve an optimal one To achieve regeneration of the NOx storage catalytic converter 15.
  • step S5 it is first checked whether the total value FL1 is above the threshold value SW1 and the total value FL2 below the lower one Threshold value USW2 lies (step S5). Is that the case, the amount of regenerant is too small and must be increased (step S11, case A).
  • the increase in the amount of regenerant can by changing the air ratio during the regeneration phase towards fat.
  • the regeneration phase can also be carried out longer be what is usually preferable since the variation of the lambda value in the regeneration phase only in narrow Limits (e.g. between 0.75 and 0.85) are possible.
  • narrow Limits e.g. between 0.75 and 0.85
  • step S7 it is checked whether the total value FL1 above the threshold SW2 and the total value FL2 above the upper threshold value OSW2 (step S7). Then the amount of regeneration agent is too large and must be reduced (Step S8, case B). The reduction in the amount of regenerant can be done analogously to the enlargement in case A. Was a smaller amount of regenerant for future use Regeneration phases of the NOx storage catalytic converter 15 are stored, the method is ended (step S11).
  • the mentioned threshold values SW, SW1, USW2, OSW2 are on determined on a test bench.

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  • 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)

Claims (10)

  1. Procédé de régénération d'un catalyseur d'accumulation de NOx (15),
    qui est disposé dans le collecteur d'échappement (12) d'un moteur à combustion interne (10) fonctionnant avec un excès d'air,
    en aval duquel est disposée une sonde de mesure de NOx (16), et
    qui, au cours d'une phase de régénération avec apport d'un moyen réducteur, transforme par catalyse le NOx accumulé, le moyen réducteur étant produit par un fonctionnement bref du moteur à combustion interne (10), avec un mélange riche air/combustible (lambda > 1),
       caractérisé en ce que,
       comme sonde de mesure de NOx (16), on utilise une sonde de mesure ampérométrique (34), constituée d'un électrolyte solide (26), qui
    présente une première cellule de mesure (20), dans laquelle est mesurée la concentration en oxygène au moyen d'une première tension de Nemst (VO) entre une première électrode (21) et une électrode de référence (29) exposée à l'air ambiant, et est régulée, au moyen d'un premier courant d'oxygène par pompe ionique (IpO) entre la première électrode (21) et une électrode extérieure (22), et
    présente une deuxième cellule de mesure (24), qui est reliée à la première cellule de mesure (20) et dans laquelle est mesurée la concentration en oxygène au moyen d'une deuxième tension de Nemst (V1) entre une deuxième électrode (25) et l'électrode de référence (29), et
    en ce que, par un raccordement en série des deux cellules de mesure (20, 24), la tension est relevée entre l'électrode extérieure (25) et l'électrode de référence (29) et en ce que ce comportement de signal de sortie (US), montrant un comportement en deux points, et dépendant de la concentration en oxygène, est relevé pendant la phase de régénération, et en ce que
    à partir de la variation dans le temps du signal de sortie (US), on déduit un critère pour savoir si la quantité de moyen de régénération pour obtenir une régénération optimale du catalyseur d'accumulation de NOx (15) doit être modifiée.
  2. Procédé suivant la revendication 1, caractérisé en ce que, comme critère, sont formées deux valeurs de somme (FL1, FL2),
    la première valeur de somme (FL1) étant calculée à partir du signal de sortie (US) balayé par une fréquence déterminée, depuis le début de la régénération jusqu'à dépasser une valeur de seuil prédéfinie (SW1),
    la deuxième valeur de somme (FL2) étant calculée à partir du signal de sortie (US) balayée avec la même fréquence depuis le dépassement de cette valeur de seuil (SW) jusqu'à devenir inférieure à la valeur de seuil (SW),
    les valeurs de somme (FL1, FL2) étant comparées à des valeurs de seuil associées (SW1, USW2 OSW2), et
    la quantité de moyen de régénération étant maintenue constante, ou augmentée, ou diminuée, en fonction du résultat de la comparaison.
  3. Procédé suivant la revendication 2, caractérisé en ce que la quantité de moyen de régénération est maintenue constante si la première valeur de somme (FL1) est plus grande que la valeur de somme (SW1) et si la deuxième valeur de somme (SW2) est à l'intérieur d'une zone délimitée par la valeur de seuil inférieure (USW2) et la valeur de seuil supérieure (OSW2).
  4. Procédé suivant la revendication 2, caractérisé en ce que la quantité de moyen de régénération est augmentée si la première valeur de somme (FL1) est plus grande que la valeur de seuil (SW1) et si la deuxième valeur de somme (SW2) est plus petite que la valeur de seuil inférieure (USW2).
  5. Procédé suivant la revendication 2, caractérisé en ce qu'on réduit la quantité de moyen de régénération si la première valeur de la somme (FL1) est plus grande que la valeur de seuil (SW1) et si la deuxième valeur de somme (FL2) est plus grande que la valeur de seuil supérieure (OSW2).
  6. Procédé suivant la revendication 4, caractérisé en ce qu'on augmente la quantité de moyen de régénération, tandis qu'on prolonge la phase de régénération.
  7. Procédé suivant la revendication 5, caractérisé en ce qu'on diminue la quantité de moyen de régénération, tandis qu'on raccourcit la phase de régénération.
  8. Procédé suivant l'une des revendications précédentes, caractérisé en ce que la durée d'une phase d'accumulation du catalyseur d'accumulation de NOx (15), pendant laquelle le moteur à combustion interne (14) est entraíné avec un excès d'air, est raccourcie et, pour le catalyseur d'accumulation de NOx (15), on effectue une régénération des sulfates si la valeur de somme (FL1) est plus petite que la valeur de seuil (SW1).
  9. Procédé suivant l'une des revendications précédentes, caractérisé en ce qu'une correction du signal de sortie (US) a lieu en fonction du premier courant d'oxygène par pompe ionique (IpO), pour compenser une erreur de tension provenant d'une résistance de passage traversée par le premier courant d'oxygène par pompe ionique (IpO).
  10. Procédé suivant l'une des revendications précédentes, caractérisé en ce que le signal de sortie (US) est corrigé en fonction de la température de la sonde de mesure de NOx (16, 34).
EP99942726A 1998-07-09 1999-07-01 PROCEDE DE REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx Expired - Lifetime EP1098694B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19830829A DE19830829C1 (de) 1998-07-09 1998-07-09 Verfahren zur Regeneration eines NOx-Speicherkatalysators
DE19830829 1998-07-09
PCT/DE1999/001907 WO2000002648A1 (fr) 1998-07-09 1999-07-01 PROCEDE DE REGENERATION D'UN CATALYSEUR ACCUMULATEUR DE NOx

Publications (2)

Publication Number Publication Date
EP1098694A1 EP1098694A1 (fr) 2001-05-16
EP1098694B1 true EP1098694B1 (fr) 2004-03-10

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US (1) US6385966B2 (fr)
EP (1) EP1098694B1 (fr)
JP (1) JP2002520530A (fr)
DE (2) DE19830829C1 (fr)
WO (1) WO2000002648A1 (fr)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
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DE19852240A1 (de) * 1998-11-12 2000-05-18 Volkswagen Ag Überwachungsverfahren für NOx-Speicherkatalysatoren und Abgasreinigungsvorrichtung zur Durchführung dieses Verfahrens
EP1196681B1 (fr) * 1999-05-19 2003-09-17 Robert Bosch Gmbh Procede pour obtenir, de maniere definie, un melange de gaz de combustion soit riche soit pauvre
DE19922962C2 (de) * 1999-05-19 2003-02-27 Daimler Chrysler Ag Verfahren zur periodischen Desulfatisierung eines Stickoxid- oder Schwefeloxid-Speichers einer Abgasreinigungsanlage
DE19923498A1 (de) 1999-05-21 2000-11-23 Volkswagen Ag Verfahren zur Steuerung einer Regeneration eines NOx-Speicherkatalysators
JP3805562B2 (ja) * 1999-06-03 2006-08-02 三菱電機株式会社 内燃機関の排気浄化装置
DE19926146A1 (de) * 1999-06-09 2000-12-14 Volkswagen Ag Verfahren zur Initiierung und Überwachung einer Entschwefelung von wenigstens einem in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NOx-Speicherkatalysator
DE19931223C2 (de) * 1999-07-06 2002-10-31 Siemens Ag Verfahren zum Erkennen und Aufrechterhalten der Betriebsbereitschaft eines NOx-Speicherkatalysators
DE19945374A1 (de) * 1999-09-22 2001-03-29 Volkswagen Ag Verfahren zur Funktionsüberwachung eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NO¶x¶-Sensors
DE19963624A1 (de) * 1999-12-29 2001-07-12 Bosch Gmbh Robert Verfahren zum Betrieb eines NOx-Speicherkatalysators bei Brennkraftmaschinen
DE19963927A1 (de) * 1999-12-31 2001-07-12 Bosch Gmbh Robert Verfahren zum Betreiben eines Speicherkatalysators einer Brennkraftmaschine
DE10001310A1 (de) * 2000-01-14 2001-07-19 Volkswagen Ag Vorrichtung und Verfahren zur Steuerung einer NOx-Regeneration eines NOx-Speicherkatalysators
DE10001432A1 (de) * 2000-01-15 2001-08-16 Volkswagen Ag Verfahren und Vorrichtung zur Steuerung einer Entschwefelung eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NO¶x¶-Speicherkatalysators
DE10003612A1 (de) * 2000-01-28 2001-08-02 Volkswagen Ag Verfahren und Vorrichtung zur Ermittlung einer NOx-Speicherkapazität eines NOx-Speicherkatalysators
DE10005474C2 (de) * 2000-02-08 2003-04-17 Bayerische Motoren Werke Ag Verfahren und Vorrichtung zur Desulfatisierung eines NOx-Speicherkatalysators mit einem NOx-Sensor
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US20010002539A1 (en) 2001-06-07
US6385966B2 (en) 2002-05-14
WO2000002648A1 (fr) 2000-01-20
EP1098694A1 (fr) 2001-05-16
JP2002520530A (ja) 2002-07-09
DE19830829C1 (de) 1999-04-08
DE59908818D1 (de) 2004-04-15

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