EP1259718B1 - Dispositif et procede pour commander la regeneration no x? d'un catalyseur accumulateur de no x? - Google Patents

Dispositif et procede pour commander la regeneration no x? d'un catalyseur accumulateur de no x? Download PDF

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Publication number
EP1259718B1
EP1259718B1 EP01909616A EP01909616A EP1259718B1 EP 1259718 B1 EP1259718 B1 EP 1259718B1 EP 01909616 A EP01909616 A EP 01909616A EP 01909616 A EP01909616 A EP 01909616A EP 1259718 B1 EP1259718 B1 EP 1259718B1
Authority
EP
European Patent Office
Prior art keywords
regeneration
storage catalyst
idling mode
threshold value
combustion engine
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.)
Expired - Lifetime
Application number
EP01909616A
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German (de)
English (en)
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EP1259718A1 (fr
EP1259718B8 (fr
Inventor
Hermann Hahn
Sören HINZE
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Volkswagen AG
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Volkswagen AG
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Publication date
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Publication of EP1259718B8 publication Critical patent/EP1259718B8/fr
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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
    • F01N3/0842—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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/41—Control to generate negative pressure in the intake manifold, e.g. for fuel vapor purging or brake booster

Definitions

  • the invention relates to an apparatus and a method for controlling a NO x regeneration of an arranged in the exhaust system of an internal combustion engine for motor vehicles NO x storage catalytic converter with the features mentioned in the preambles of the independent claims.
  • the catalyst is associated with a NO x storage, which absorbs the NO x as nitrate.
  • the NO x storage can be combined with the catalyst as a so-called NO x storage catalytic converter.
  • a storage capacity of the NO x storage catalytic converter is of course limited in quantity, so that in order to avoid NO x breakthroughs at regular intervals a NO x regeneration must take place. This is described in US Pat. No. 5,992,142 (column 5). During the NO x regeneration, a change to stoichiometric or rich operation takes place. The previously absorbed in the form of nitrate NO x is released again. Usually, the NO x regeneration is started when a threshold value for a load state of the NO x storage catalytic converter or a NO x emission (break-through emission) detected downstream by an NO x -sensitive measuring device is exceeded.
  • the disadvantage here is that the determination of a Regeneration need in all operating phases of the motor vehicle is carried out according to the same criteria.
  • the re-desorbed NO x can only be reduced incomplete on the catalyst component.
  • a regeneration-related excess consumption in the idling phase is higher than in phases of high load requirements for the internal combustion engine.
  • Another disadvantage is that the NO x regeneration in idle often accompanied by an undesirable noise.
  • NO x regenerations in idle take longer due to the lower exhaust flows, and the consumption-less operation must therefore be maintained longer.
  • this object is achieved by the device and the method for controlling the NO x regeneration of the NO x storage catalytic converter with the features mentioned in the independent claims.
  • the device according to the invention has means with which the method steps can be carried out.
  • Such means is preferably a control unit in which a procedure is stored in digitized form, which allows the control of the NO x regeneration at idle.
  • the control unit can be realized as an independent control unit or else integrated into an already frequently existing engine control unit.
  • a NO x regeneration is being carried out during a change to idling, this is preferably completed when the change to idling takes place in a fuel cut-off phase, a rotational speed is above a predetermined threshold value or a motor vehicle speed is still a predetermined limit speed exceeds.
  • a flag is set which causes the NO x regeneration to be continued in a subsequent acceleration phase. Of course, the flag is withdrawn if an NO x regeneration had to be carried out in idle mode already.
  • FIG. 1 shows an internal combustion engine 10 with a subsequently arranged in the exhaust line 12 NO x storage catalytic converter 14.
  • the exhaust system 12 is associated with a suitable sensor for detecting the air conditions in the exhaust gas or the shares of specific pollutant components.
  • a gas sensor 16 as a lambda probe and a gas sensor can be for example 18 as a NO x -sensitive measuring device are provided.
  • the data acquired by the sensors are provided in a known manner in an engine control unit 20.
  • models are stored in digitized form, with which manipulated variables for the internal combustion engine 10 associated components are determined.
  • the components allow the combustion process to be influenced with regard to an air ratio, an ignition angle or also an injected fuel mass.
  • an opening angle of an exhaust gas recirculation valve 22 or a position of a throttle valve 24 come into question as control variables.
  • the device and the method for regulating the combustion process are well known and will therefore not be explained in detail here.
  • step S1 it is determined in a first query whether the motor vehicle is in an idling phase (step S1). If this is negative, the NO x regeneration of the NO x storage catalyst 14 may be controlled by a conventional method. For this purpose, a loading state of the NO x storage catalytic converter 14 or a NO x emission downstream of the NO x storage catalytic converter 14 is monitored (step S 2). When a threshold is exceeded for this quantity, the NO x regeneration is initiated by a change to stoichiometric or rich operation.
  • Steps S5 and S6, or if the change in the idling does not take place during an ongoing NO x regeneration (step S3) is followed by a redefinition of the thresholds for determining the need for regeneration (step S7).
  • the thresholds for the load state or the NO x emission used in the conventional methods are increased.
  • the values are to be determined so that no significant NO x breakthroughs can occur at idling.
  • due to the low exhaust gas mass flows this can also be ensured with higher threshold values than for the other operating phases of the internal combustion engine 10.

Claims (7)

  1. Procédé servant à commander la régénération des NOx d'un catalyseur à accumulation de NOx (14) disposé dans la ligne d'échappement (12) d'un moteur à combustion interne (10) pour véhicules automobiles, la régénération des NOx étant déclenchée au moins lorsque l'on dépasse une valeur-seuil relative à un état de chargement du catalyseur à accumulation de NOx (14) ou une valeur-seuil relative à une émission de NOx en aval du catalyseur à accumulation de NOx (14), caractérisé en ce que
    (a) l'on détecte si le moteur à combustion interne (10) est mis au ralenti et,
    (b) en cas de ralenti, on prend l'une des mesures suivantes, d'une manière alternative ou en les combinant à volonté :
    - augmentation de la valeur-seuil relative à l'état de chargement du catalyseur à accumulation de NOx (14) ou à l'émission de NOx en aval du catalyseur à accumulation de NOx (14),
    - déclenchement de la régénération des NOx seulement après expiration d'un intervalle de temps fixé à l'avance, et
    - interruption d'une régénération en cours des NOx lors du passage au ralenti si au moins l'une des conditions marginales suivantes est remplie :
    - il n'y a aucune phase de coupure d'alimentation en poussée,
    - une vitesse de véhicule automobile ne dépasse pas une vitesse limite fixée à l'avance et/ou
    - un nombre de tours n'est pas supérieur à une valeur-seuil fixée à l'avance.
  2. Procédé selon la revendication 1, caractérisé en ce que, en cas d'interruption d'une régénération en cours des NOx lors d'un passage au ralenti, on pose un indicateur qui fait que la régénération des NOx se poursuit au cours d'une phase suivante d'accélération du véhicule automobile.
  3. Procédé selon la revendication 2, caractérisé en ce que l'on retire l'indicateur s'il fallait déjà effectuer une régénération des NOx au cours du fonctionnement au ralenti.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la régénération des NOx est effectuée au cours du fonctionnement au ralenti en indiquant une valeur lambda moins riche que lors d'une régénération des NOx lors d'un fonctionnement hors ralenti, notamment en indiquant une valeur lambda comprise dans une fourchette de 0,85 à 1,0.
  5. Dispositif servant à commander la régénération des NOx d'un catalyseur à accumulation de NOx disposé dans la ligne d'échappement d'un moteur à combustion interne pour véhicules automobiles, avec lequel on déclenche la régénération des NOx au moins lorsque l'on dépasse une valeur-seuil relative à un état de chargement du catalyseur à accumulation de NOx ou à une émission de NOx en aval du catalyseur à accumulation de NOx, caractérisé en ce qu'il y a des moyens avec lesquels
    (a) on détecte si le moteur à combustion interne (10) est mis au ralenti et,
    (b) en cas de ralenti, on prend l'une des mesures suivantes, d'une manière alternative ou en les combinant à volonté :
    - augmentation de la valeur-seuil relative à l'état de chargement du catalyseur à accumulation de NOx (14) ou à l'émission de NOx en aval du catalyseur à accumulation de NOx (14),
    - déclenchement de la régénération des NOx seulement après expiration d'un intervalle de temps fixé à l'avance, et
    - interruption d'une régénération en cours des NOx lors du passage au ralenti si au moins l'une des conditions marginales suivantes est remplie :
    - il n'y a aucune phase de coupure d'alimentation en poussée,
    - une vitesse de véhicule automobile ne dépasse pas une vitesse limite fixée à l'avance et/ou
    - un nombre de tours n'est pas supérieur à une valeur-seuil fixée à l'avance.
  6. Dispositif selon la revendication 5, caractérisé en ce que les moyens comprennent un appareil de commande (36) dans lequel on a déposé, sous forme numérisée, une procédure de commande de la régénération des NOx du catalyseur à accumulation de NOx (14) en phase de ralenti.
  7. Dispositif selon la revendication 6, caractérisé en ce que l'appareil de commande (36) est intégré dans un appareil de commande de moteur (20).
EP01909616A 2000-02-17 2001-01-12 Dispositif et procede pour commander la regeneration nox d'un catalyseur accumulateur de nox Expired - Lifetime EP1259718B8 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10007049A DE10007049A1 (de) 2000-02-17 2000-02-17 Vorrichtung und Verfahren zur Steuerung einer NO¶x¶-Regeneration eines NO¶x¶-Speicherkatalysators
DE10007049 2000-02-17
PCT/EP2001/000336 WO2001061173A1 (fr) 2000-02-17 2001-01-12 Dispositif et procede pour commander la regeneration nox d'un catalyseur accumulateur de no¿x?

Publications (3)

Publication Number Publication Date
EP1259718A1 EP1259718A1 (fr) 2002-11-27
EP1259718B1 true EP1259718B1 (fr) 2005-09-21
EP1259718B8 EP1259718B8 (fr) 2006-03-01

Family

ID=7631189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01909616A Expired - Lifetime EP1259718B8 (fr) 2000-02-17 2001-01-12 Dispositif et procede pour commander la regeneration nox d'un catalyseur accumulateur de nox

Country Status (6)

Country Link
EP (1) EP1259718B8 (fr)
JP (1) JP4421162B2 (fr)
CN (1) CN100340755C (fr)
AT (1) ATE305087T1 (fr)
DE (2) DE10007049A1 (fr)
WO (1) WO2001061173A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2833993B1 (fr) * 2001-12-26 2004-06-25 Renault Procede de gestion du fonctionnement de dispositifs de post-traitement actifs inseres dans la ligne d'echappement d'un moteur a combustion interne
JP3812653B2 (ja) 2002-01-17 2006-08-23 三菱自動車工業株式会社 車両用内燃機関の排気浄化装置
DE10242914B4 (de) * 2002-09-16 2006-01-12 Siemens Ag Verfahren zur Adaption der NOx-Rohemission bei Verbrennungskraftmaschinen
DE10305635B4 (de) * 2003-02-11 2011-01-13 Continental Automotive Gmbh Abgasreinigungsverfahren für Magerbrennkraftmaschinen
FR2862099B1 (fr) 2003-11-07 2006-04-14 Peugeot Citroen Automobiles Sa Systeme d'aide a la regeneration de moyens de depollution integres dans une ligne d'echappement d'un moteur diesel de vehicule
FR2862096B1 (fr) * 2003-11-07 2006-02-17 Peugeot Citroen Automobiles Sa Systeme d'aide a la regeneration de moyens de depollution integres dans une ligne d'echappement d'un moteur de vehicule
FR2862098B1 (fr) 2003-11-07 2006-02-17 Peugeot Citroen Automobiles Sa Systeme d'aide a la regeneration de moyens de depollution integres dans une ligne d'echappement d'un moteur diesel de vehicule
FR2862103B1 (fr) 2003-11-07 2006-02-17 Peugeot Citroen Automobiles Sa Systeme d'aide a la regeneration de moyens de depollution integres dans une ligne d'echapement d'un moteur diesel de vehicule automobile
FR2862097B1 (fr) 2003-11-07 2006-02-17 Peugeot Citroen Automobiles Sa Systeme d'aide a la regeneration de moyens de depollution integres dans une ligne d'echappement d'un moteur diesel de vehicule
DE102011101079B4 (de) * 2011-05-10 2020-08-20 Umicore Ag & Co. Kg Verfahren zur Regeneration von NOx-Speicherkatalysatoren von Dieselmotoren mit Niederdruck-AGR
JP6481392B2 (ja) * 2015-02-02 2019-03-13 いすゞ自動車株式会社 排気浄化システム
CN104929736B (zh) * 2015-07-13 2017-11-10 潍柴动力股份有限公司 燃气车载催化器再生的控制方法
DE102017223819A1 (de) * 2017-12-27 2019-06-27 Hyundai Motor Company Regenerationssystem, Fahrzeug umfassend dasselbe und Regenerationsverfahren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996022457A1 (fr) * 1995-01-20 1996-07-25 Toyota Jidosha Kabushiki Kaisha Procede de nettoyage des gaz d'echappement pour moteur a combustion interne
DE19636790A1 (de) * 1996-09-11 1998-03-12 Volkswagen Ag NOx-Abgasreinigungsverfahren
DE19640161A1 (de) * 1996-09-28 1998-04-02 Volkswagen Ag NOx-Abgasreinigungsverfahren
DE19716275C1 (de) * 1997-04-18 1998-09-24 Volkswagen Ag Verfahren zur Stickoxidreduzierung im Abgas einer Brennkraftmaschine
DE19758018A1 (de) * 1997-12-29 1999-07-01 Volkswagen Ag Regeneration eines NOx-Speicherkatalysators eines Verbrennungsmotors
DE19828609A1 (de) * 1998-06-26 1999-12-30 Siemens Ag Verfahren zur Regeneration eines NO¶x¶-Speicherkatalysators für eine Brennkraftmaschine

Also Published As

Publication number Publication date
JP4421162B2 (ja) 2010-02-24
DE10007049A1 (de) 2001-08-23
CN100340755C (zh) 2007-10-03
EP1259718A1 (fr) 2002-11-27
CN1401054A (zh) 2003-03-05
EP1259718B8 (fr) 2006-03-01
ATE305087T1 (de) 2005-10-15
JP2003522897A (ja) 2003-07-29
DE50107485D1 (de) 2006-02-02
WO2001061173A1 (fr) 2001-08-23

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