WO2001065096A1 - 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 - Google Patents

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 Download PDF

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Publication number
WO2001065096A1
WO2001065096A1 PCT/EP2001/001787 EP0101787W WO0165096A1 WO 2001065096 A1 WO2001065096 A1 WO 2001065096A1 EP 0101787 W EP0101787 W EP 0101787W WO 0165096 A1 WO0165096 A1 WO 0165096A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gas
regeneration
gas recirculation
internal combustion
combustion engine
Prior art date
Application number
PCT/EP2001/001787
Other languages
German (de)
English (en)
Inventor
Ekkehard Pott
Hermann Hahn
Sören HINZE
Michael Zillmer
Original Assignee
Volkswagen Aktiengesellschaft
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 Aktiengesellschaft filed Critical Volkswagen Aktiengesellschaft
Priority to EP01919298A priority Critical patent/EP1264093A1/fr
Priority to AU46446/01A priority patent/AU4644601A/en
Publication of WO2001065096A1 publication Critical patent/WO2001065096A1/fr

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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
    • F02D41/02—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
    • 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
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus

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 9
  • 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 exhaust jerk transit rate before the end of the NO x -Regenerat ⁇ on to 5 to 25 volume -%, in particular 15 vol ⁇ ⁇ %, is increased at the end of the NO x -Regenerat ⁇ on to reach exhaust jerk transit rate can, in particular of the return rate to be set after the end of the NO x regeneration are made dependent
  • a further advantageous embodiment provides for the exhaust gas recirculation rate to be increased gradually or continuously before the end of the NO x regeneration. In this way, the transition can be leveled further
  • the exhaust gas recirculation rate is increased 5 to 0.5 s, in particular 2 s, before the NO x regeneration has ended.
  • the time of the increase in the exhaust gas recirculation rate before the end of the NO x regeneration depending on the existing before and / or after the increase in exhaust gas recirculation rate, for example, in the event of a large difference in the exhaust gas recirculation rates, an increase in the exhaust gas recirculation rate should be started before and after the increase relatively early before the end of the NO x regeneration.
  • means are provided with which the method steps of carrying out the NO x regeneration can be carried out at a reduced exhaust gas recirculation rate or without exhaust gas recirculation and increasing an exhaust gas recirculation rate before the NO x regeneration has ended
  • 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 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.
  • a control unit 22 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 using both example influences an air-fuel mixture to be fed in. For this purpose, Fresh air volume flow sucked in regulated by the position of 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 oxygen content 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. 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 that is still in the exhaust gas recirculation line 28 from the previous lean phase 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 the result of the exhaust gas being fed into the fresh air drawn in.
  • 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. Without exhaust gas recirculation, the lambda curve 34 exhibits an almost immediately after switching of the internal combustion engine 10 into the rich operating mode at time tg and is relatively steep falling course, so that the lambda fat specification ⁇ f already at a time t-
  • the regeneration time that must be applied for a complete emptying of the memory of the NO x storage catalytic converter 16 is considerably shorter than in the case of approved exhaust gas recirculation, so that the end of the NO x regeneration is already reached at a point in time t 2 a 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 s'effectue, 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 et qu'un recyclage des gaz d'échappement soit renforcé ou lancé avant la fin d'une régénération de NOx. Selon l'invention, on obtient ainsi une commutation rapide dans la zone de régénération, sans raté d'allumage, ainsi qu'une courte période de régénération.
PCT/EP2001/001787 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 WO2001065096A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01919298A EP1264093A1 (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
AU46446/01A AU4644601A (en) 2000-03-02 2001-02-16 Method and device for carrying out an nox regeneration of an NOx storage-type catalytic converter mounted in an exhaust gas channel of an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10010031A DE10010031B4 (de) 2000-03-02 2000-03-02 Verfahren und Vorrichtung zur Durchführung einer NOx-Regeneration eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NOx-Speicherkatalysators
DE10010031.7 2000-03-02

Publications (1)

Publication Number Publication Date
WO2001065096A1 true WO2001065096A1 (fr) 2001-09-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/001787 WO2001065096A1 (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

Country Status (5)

Country Link
EP (1) EP1264093A1 (fr)
CN (1) CN1287077C (fr)
AU (1) AU4644601A (fr)
DE (1) DE10010031B4 (fr)
WO (1) WO2001065096A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4154596B2 (ja) * 2003-06-02 2008-09-24 三菱自動車工業株式会社 内燃機関の排気浄化装置
CN100451314C (zh) * 2004-06-24 2009-01-14 丰田自动车株式会社 排气排放控制系统的净化能力恢复方法
CN101415915B (zh) * 2006-04-07 2012-05-09 排放控制技术有限公司 用于操作减排系统的方法和设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5775099A (en) * 1994-04-12 1998-07-07 Toyota Jidosha Kabushiki Kaisha Method of purifying the exhaust of an internal combustion engine
DE19824915C1 (de) * 1998-06-04 1999-02-18 Daimler Benz Ag Verfahren zum Wechseln der Betriebsart einer direkt-einspritzenden Otto-Brennkraftmaschine
US5992142A (en) * 1996-09-28 1999-11-30 Volkswagen Ag No exhaust emission control method and arrangement
EP0974747A2 (fr) * 1998-07-22 2000-01-26 Toyota Jidosha Kabushiki Kaisha Système de commande pour moteur à combustion interne
US6079204A (en) * 1998-09-21 2000-06-27 Ford Global Technologies, Inc. Torque control for direct injected engines using a supplemental torque apparatus
EP1026374A2 (fr) * 1999-02-08 2000-08-09 Mazda Motor Corporation Dispositif de purification de gaz d'échappement pour un moteur à combustion interne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19716275C1 (de) * 1997-04-18 1998-09-24 Volkswagen Ag Verfahren zur Stickoxidreduzierung im Abgas einer Brennkraftmaschine
DE19749400C2 (de) * 1997-11-07 2001-11-29 Siemens Ag Verfahren zur Verringerung des NOX-Gehaltes im Abgas einer Dieselbrennkraftmaschine
DE19851319C2 (de) * 1998-11-06 2003-03-20 Siemens Ag Verfahren zum Bestimmen der NOx-Rohemission einer mit Luftüberschuß betreibbaren Brennkraftmaschine
DE19858990A1 (de) * 1998-12-21 2000-06-29 Volkswagen Ag NOx-Speicher-Katalysator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5775099A (en) * 1994-04-12 1998-07-07 Toyota Jidosha Kabushiki Kaisha Method of purifying the exhaust of an internal combustion engine
US5992142A (en) * 1996-09-28 1999-11-30 Volkswagen Ag No exhaust emission control method and arrangement
DE19824915C1 (de) * 1998-06-04 1999-02-18 Daimler Benz Ag Verfahren zum Wechseln der Betriebsart einer direkt-einspritzenden Otto-Brennkraftmaschine
EP0974747A2 (fr) * 1998-07-22 2000-01-26 Toyota Jidosha Kabushiki Kaisha Système de commande pour moteur à combustion interne
US6079204A (en) * 1998-09-21 2000-06-27 Ford Global Technologies, Inc. Torque control for direct injected engines using a supplemental torque apparatus
EP1026374A2 (fr) * 1999-02-08 2000-08-09 Mazda Motor Corporation Dispositif de purification de gaz d'échappement pour un moteur à combustion interne

Also Published As

Publication number Publication date
DE10010031A1 (de) 2001-09-13
CN1429315A (zh) 2003-07-09
CN1287077C (zh) 2006-11-29
DE10010031B4 (de) 2011-06-09
EP1264093A1 (fr) 2002-12-11
AU4644601A (en) 2001-09-12

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