EP1264095A1 - PROCEDE ET DISPOSITIF POUR EFFECTUER LA REGENERATION DE NO x? D'UN POT CATALYTIQUE D'ACCUMULATION DE NO x? MONTE DANS LE CONDUIT D'ECHAPPEMENT D'UN MOTEUR A COMBUSTION INTERNE - Google Patents

PROCEDE ET DISPOSITIF POUR EFFECTUER LA REGENERATION DE NO x? D'UN POT CATALYTIQUE D'ACCUMULATION DE NO x? MONTE DANS LE CONDUIT D'ECHAPPEMENT D'UN MOTEUR A COMBUSTION INTERNE

Info

Publication number
EP1264095A1
EP1264095A1 EP01905789A EP01905789A EP1264095A1 EP 1264095 A1 EP1264095 A1 EP 1264095A1 EP 01905789 A EP01905789 A EP 01905789A EP 01905789 A EP01905789 A EP 01905789A EP 1264095 A1 EP1264095 A1 EP 1264095A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
regeneration
internal combustion
combustion engine
gas recirculation
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.)
Withdrawn
Application number
EP01905789A
Other languages
German (de)
English (en)
Inventor
Ekkehard Pott
Hermann Hahn
Sören HINZE
Michael Zillmer
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 EP1264095A1 publication Critical patent/EP1264095A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0055—Special engine operating conditions, e.g. for regeneration 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
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method and a device for carrying out a NO x regeneration of a NO x storage catalytic converter arranged in an exhaust gas duct of an internal combustion engine with the features mentioned in the preamble of claims 1 and 8
  • catalytic converters with NO x storage function (NO x storage catalytic converters) in exhaust gas lines of internal combustion engines.
  • the catalytic converter thereby reduces an emission of pollutants by providing a Conversion of exhaust gas components, such as carbon monoxide, unburned hydrocarbons and nitrogen oxides, into less environmentally relevant compounds requires that internal combustion engines are operated as permanently as possible in a lean operating mode with ⁇ > 1, i.e. with an excess of oxygen in a supplied air-fuel mixture under these conditions, fuel consumption is reduced.
  • the NO x regeneration is carried out during at least part of its regeneration duration at an exhaust gas recirculation rate of 0 to 15 vol%, in particular at 0 to 10 vol%.
  • Current customary recirculation rates vary depending on the engine type Range of 25 to 35 vol.%
  • the volume fraction relates to a proportion of the recirculated exhaust gas volume in an overall air volume to be supplied to the internal combustion engine.
  • the exhaust gas recirculation rate can be varied stepwise or continuously during the regeneration
  • the NO x regeneration is carried out over at least 50% of its regeneration duration with the reduced exhaust gas recirculation rate or without exhaust gas recirculation. It is furthermore advantageous to reduce or block the exhaust gas recirculation during an initial phase of the NO x regeneration.
  • means are provided with which the method steps of switching off and / or throttling an exhaust gas recirculation can be carried out during at least part of a regeneration period
  • these means comprise a control unit in which a procedure for controlling the method steps for carrying out NO x regeneration and the NO x storage catalytic converter is stored in digital form, the control unit being able to be integrated in an engine control unit
  • Figure 1 is a schematic arrangement of an internal combustion engine with an exhaust duct
  • Figure 2 shows a time course of lambda during a NO x regeneration with and without exhaust gas recirculation
  • FIG. 1 shows a schematic illustration of an internal combustion engine 10 with an exhaust gas channel 12 assigned to it. Downstream of the internal combustion engine 10, a small-volume pre-catalytic converter 14 and a NO x storage catalytic converter 16 are arranged in the exhaust gas channel 12. A lambda probe 18 is used to detect an oxygen concentration in the exhaust gas and is still located in front of the catalytic converter system 14, 16 in the exhaust gas duct 12. The lambda probe 18 outputs a signal to an engine control unit 20, which processes this and other measurement signals and operating parameters of the internal combustion engine 10. Integrated in the engine control unit 20 is a control unit 22, in which the procedure according to the invention for carrying out a NO x regeneration of the NO x storage catalytic converter 16 is stored in digital form.
  • the engine control unit 20 or the control unit 22 controls the operating mode of the internal combustion engine 10 by being For example, an intake fresh air volume flow is regulated by setting a throttle valve 24 in an intake pipe 26. Furthermore, the engine control unit 20 or the control unit 22 controls an exhaust gas recirculation valve 30 arranged in a return line 28
  • the control unit 22 switches the internal combustion engine 10 into a homogeneous, stoichiometric or rich operating mode.
  • the control unit 22 specifies, for example, a stronger closed position of the throttle valve 24 , so that the proportion of oxygen in the supplied air-fuel mixture is reduced.
  • the exhaust gas recirculation is reduced and / or completely prevented during at least part of the regeneration period. This is also done by a corresponding control of the exhaust gas recirculation valve 30 by the engine control unit 20 or the control unit 22 FIG.
  • FIG. 2 shows a simplified representation of a time course of a lambda value measured in front of the catalytic converter system 14, 16 with the lambda probe 18 during a NO x regeneration of the NO x storage catalytic converter 16.
  • the broken line 32 represents a lambda course during regeneration with activation of an exhaust gas recirculation according to current customary practice (recirculation rate about 30% by volume), while the solid line 34 shows a corresponding lambda curve without exhaust gas recirculation.
  • both curves 32, 34 have a constant level corresponding to a lambda lean specification ⁇ m after detection of a need for regeneration and switching of an air-fuel mixture supplied to the internal combustion engine 10 to a rich, that is to say fuel-rich composition, at a point in time tg, the signal 32 measured with simultaneous exhaust gas recirculation still persists for a certain delay lean lambda value ⁇ m This can be attributed to the oxygen-rich exhaust gas, which from the previous lean phase is still in the exhaust gas recirculation line 28 and is supplied to the fresh air drawn in.
  • the signal 32 drops relatively flat until a time t-
  • the flatness of the previous drop in the lambda value is also a result of the exhaust gas being fed into the fresh air drawn in.
  • the lambda fat specification ⁇ f is maintained and stored nitrogen oxides NO x of the NO x storage catalytic converter 16 reduced with the reducing agents CO and HC present in the exhaust gas.
  • the internal combustion engine 10 is switched back to the lean mode so that the lambda value reappears for the lambda lean specification ⁇ m
  • the lambda curve 34 (solid line) measured according to the invention without exhaust gas recirculation shows considerable deviations from the curve 32 explained above, measured with the exhaust gas recirculation switched on falling course, so that the lambda fat specification ⁇ f already at a time t-
  • the very long regeneration period with simultaneous exhaust gas recirculation (curve 32) is a result of the constant exhaust gas extraction, so that only a reduced reducing agent mass flow is available to convert the nitrogen oxides of the NO x storage catalytic converter

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)

Abstract

L'invention concerne un procédé et un dispositif permettant d'effectuer la régénération de NOx d'un pot catalytique d'accumulation de NOx monté dans le conduit d'échappement d'un moteur à combustion interne. Le moteur à combustion interne peut être actionné dans différents modes de fonctionnement et dans au moins un desdits modes de fonctionnement, il intervient un recyclage des gaz d'échappement en air d'admission du moteur à combustion interne. Il est prévu que la régénération de NOx intervienne, pendant au moins une partie d'une période de régénération, à un taux de recyclage des gaz d'échappement réduit et/ou sans recyclage des gaz d'échappement. Selon l'invention, on obtient ainsi une commutation rapide en mode de régénération, sans raté d'allumage, ainsi qu'une courte période de régénération.
EP01905789A 2000-03-02 2001-02-16 PROCEDE ET DISPOSITIF POUR EFFECTUER LA REGENERATION DE NO x? D'UN POT CATALYTIQUE D'ACCUMULATION DE NO x? MONTE DANS LE CONDUIT D'ECHAPPEMENT D'UN MOTEUR A COMBUSTION INTERNE Withdrawn EP1264095A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10010033A DE10010033A1 (de) 2000-03-02 2000-03-02 Verfahren und Vorrichtung zur Durchführung einer NOx-Regeneration eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NO¶x¶-Speicherkatalysators
DE10010033 2000-03-02
PCT/EP2001/001788 WO2001065097A1 (fr) 2000-03-02 2001-02-16 PROCEDE ET DISPOSITIF POUR EFFECTUER LA REGENERATION DE NOx D'UN POT CATALYTIQUE D'ACCUMULATION DE NOx MONTE DANS LE CONDUIT D'ECHAPPEMENT D'UN MOTEUR A COMBUSTION INTERNE

Publications (1)

Publication Number Publication Date
EP1264095A1 true EP1264095A1 (fr) 2002-12-11

Family

ID=7633149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01905789A Withdrawn EP1264095A1 (fr) 2000-03-02 2001-02-16 PROCEDE ET DISPOSITIF POUR EFFECTUER LA REGENERATION DE NO x? D'UN POT CATALYTIQUE D'ACCUMULATION DE NO x? MONTE DANS LE CONDUIT D'ECHAPPEMENT D'UN MOTEUR A COMBUSTION INTERNE

Country Status (4)

Country Link
EP (1) EP1264095A1 (fr)
AU (1) AU2001233776A1 (fr)
DE (1) DE10010033A1 (fr)
WO (1) WO2001065097A1 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0185697B1 (ko) * 1995-01-20 1999-03-20 와다 아키히로 내연기관의 배기정화방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0165097A1 *

Also Published As

Publication number Publication date
AU2001233776A1 (en) 2001-09-12
DE10010033A1 (de) 2001-09-27
WO2001065097A1 (fr) 2001-09-07

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