WO1999043420A1 - STEUERUNG EINES NOx-ABSORBER-KATALYSATORS - Google Patents

STEUERUNG EINES NOx-ABSORBER-KATALYSATORS Download PDF

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Publication number
WO1999043420A1
WO1999043420A1 PCT/EP1999/000864 EP9900864W WO9943420A1 WO 1999043420 A1 WO1999043420 A1 WO 1999043420A1 EP 9900864 W EP9900864 W EP 9900864W WO 9943420 A1 WO9943420 A1 WO 9943420A1
Authority
WO
WIPO (PCT)
Prior art keywords
nox
regeneration
engine
sensor
catalytic converter
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.)
Ceased
Application number
PCT/EP1999/000864
Other languages
German (de)
English (en)
French (fr)
Inventor
Hermann Hahn
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
Priority to JP2000533209A priority Critical patent/JP2002504422A/ja
Priority to DE59903317T priority patent/DE59903317D1/de
Priority to EP99913153A priority patent/EP1060003B1/de
Publication of WO1999043420A1 publication Critical patent/WO1999043420A1/de
Priority to US09/641,416 priority patent/US6408615B1/en
Anticipated expiration legal-status Critical
Ceased 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9495—Controlling the catalytic process
    • 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
    • F02D41/146—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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F02D2041/1468—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 ammonia content or concentration of the exhaust gases

Definitions

  • the invention relates to a control of a NOx absorber catalyst with a NOx sensor, in particular the control of the catalyst regeneration by monitoring the exhaust gas with a NOx sensor.
  • NOx storage catalysts are preferably used for the denitrification of a lean exhaust gas, the NOx storage of the catalyst storing the NOx during the lean operation and releasing it again during the rich operation of the engine.
  • the NOx released in the catalytic converter is reduced by the reducing components of the rich exhaust gas.
  • the amount of NOx that the NOx storage of the absorber catalytic converter can hold is limited, so that the NOx storage loses its absorption capacity after the engine has been in operation for a long time. It is therefore necessary to regenerate the NOx storage from time to time. This regeneration can be carried out at predetermined time intervals, which, however, has the disadvantage that the NOx store is regenerated, although its capacity has not yet been exhausted, which leads to increased fuel consumption due to a higher operating frequency of the engine in the rich state. It is also possible to calculate the load from the available engine data, but this also only leads to an approximate determination of the load of the NOx store. Therefore, a safety margin must be built into this regeneration process so that increased fuel consumption is also to be expected.
  • the time of a necessary regeneration can be determined directly by a NOx sensor on the basis of the rise in the NOx signal that occurs when the NOx store is full.
  • the question remains open how long such a regeneration must be carried out under rich conditions so that the NOx store is completely emptied.
  • the rich operation of the engine should, if possible, not take longer than is necessary for the complete regeneration of the NOx accumulator, since otherwise an unnecessarily higher fuel consumption can be expected.
  • the invention is therefore based on the object of a method for determining the
  • this point in time is detected by a sensor which has a cross-sensitivity to a breakthrough exhaust gas product which emerges from the catalytic converter at the end of the regeneration phase.
  • a cross-sensitivity is present if the sensor can detect at least one other product in addition to an intended sensitivity, in particular for NOx, but which does not occur or does not occur during the non-regeneration phase (storage phase) and thus does not interfere with a measurement result during the non-regeneration phase .
  • the breakthrough product is preferably a reducing component of the exhaust gas, the reducing component being, for example, CO or NH3.
  • a NOx sensor which has the cross sensitivity mentioned is preferably used as the sensor. Since the start of the regeneration phase can also be precisely detected by the NOx sensor, an exact determination of the necessary regeneration interval is possible, which leads to optimal fuel consumption of the lean-burn engine.
  • Determining the actual end of the regeneration interval opens up a number of possibilities for engine management.
  • the sensor signal is used to end the regeneration phase of the NOx store and to run the engine lean again.
  • the sensor signal can be used to correct the NOx storage / regeneration model stored in the engine management unit of the engine. Is to - 3 - to say that the regeneration or its duration is usually derived from the engine map stored in the engine management unit. Since the map only inadequately reproduces the engine properties during the operation of the engine, the map can be adapted to the actual conditions by knowing the actual regeneration interval, for example from time to time it is not regenerated according to the stored map, but the regeneration via measured sensor signals. Furthermore, the mortality management unit is given the opportunity to determine the deviation of the stored map from reality.
  • the regeneration duration can be determined according to the sensor signal, or after the engine has warmed up, this regeneration can also be carried out after the actual measurement every 1st - 5th time.
  • the sensor signal i. H. the time of the end of the regeneration can be used to determine the aging state of the catalytic converter by comparing the actual regeneration period with the target regeneration period stored in the engine management unit.
  • Fig. 1 shows schematically a lean engine system
  • FIG. 2 schematically shows the behavior of a NOx sensor during a lean-fat cycle.
  • An engine system of a lean-burn engine comprises a lean-burn engine 1, the exhaust system of which comprises an optional pre-catalytic converter 2, a NOx storage catalytic converter 3 and a NOx sensor 5 arranged in the end pipe 4 of the exhaust system.
  • the measurement signal of the NOx sensor 5 is processed in an engine management unit 6, which controls the engine 1, in particular the rich and lean operation.
  • NOx sensors 5 come thick film NOx sensors, as described by Kato et. al .: "Performance of Thick Film NOx-Sensor on Diesel and Gasoiine Engines", Soc. Of Automotive Engineers, 1997, pp. 199-201.
  • Such NOx sensors are manufactured, for example, by NGK Spark Plugs Co./NTK. - 4 -
  • FIG. 2 shows the behavior of such a NOx sensor during a lean-rich cycle of a lean-engine.
  • the time t is plotted against the output signal A of the NOx sensor 5.
  • the NOx sensor 5, as shown in FIG. 1, is arranged behind the NOx storage catalytic converter 3.
  • the engine is operated lean during the time interval 0-1.
  • the concentration of nitrogen oxides increases, which can no longer be stored by the NOx storage and therefore run through the NOx storage catalytic converter. This results in the increasingly increasing curve of the output signal of the NOx sensor 5.
  • the regeneration of the NOx memory in is carried out in switched to rich or stoichiometric engine operation.
  • This can result in a peak after the catalyst 3, the height and duration of which depends, inter alia, on the oxygen storage capacity of the catalyst used and the quality of the switchover process.
  • the NOx concentration drops behind the catalytic converter 3, ie the concentration ideally drops to zero.
  • the output signal of the NOx sensor 5 thus falls to zero.
  • the fat components emitted by the engine 1 in the catalytic converter 3 are used to reduce the NOx.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
PCT/EP1999/000864 1998-02-27 1999-02-10 STEUERUNG EINES NOx-ABSORBER-KATALYSATORS Ceased WO1999043420A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2000533209A JP2002504422A (ja) 1998-02-27 1999-02-10 ＮＯｘ吸収触媒の制御方法
DE59903317T DE59903317D1 (de) 1998-02-27 1999-02-10 Steuerung eines nox-absorber-katalysators
EP99913153A EP1060003B1 (de) 1998-02-27 1999-02-10 Steuerung eines nox-absorber-katalysators
US09/641,416 US6408615B1 (en) 1998-02-27 2000-08-16 Method for controlling an NOx accumulating catalytic converter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19808382.3 1998-02-27
DE19808382A DE19808382A1 (de) 1998-02-27 1998-02-27 Steuerung eines NOx-Absorber-Katalysator

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/641,416 Continuation US6408615B1 (en) 1998-02-27 2000-08-16 Method for controlling an NOx accumulating catalytic converter

Publications (1)

Publication Number Publication Date
WO1999043420A1 true WO1999043420A1 (de) 1999-09-02

Family

ID=7859148

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/000864 Ceased WO1999043420A1 (de) 1998-02-27 1999-02-10 STEUERUNG EINES NOx-ABSORBER-KATALYSATORS

Country Status (6)

Country Link
US (1) US6408615B1 (https=)
EP (1) EP1060003B1 (https=)
JP (1) JP2002504422A (https=)
CN (1) CN1142819C (https=)
DE (2) DE19808382A1 (https=)
WO (1) WO1999043420A1 (https=)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209332A3 (de) * 2000-11-22 2004-06-09 Volkswagen Aktiengesellschaft Verfahren und Vorrichtungen zur Regeneration eines NOx-Speicherkatalysators
EP1640578A1 (de) * 2004-09-25 2006-03-29 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens

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DE19929042A1 (de) * 1999-06-25 2000-12-28 Audi Ag Verfahren zur Steuerung der Regenerationsphasen eines NO¶x¶-Speicherkatalysators
FR2798425B1 (fr) * 1999-09-13 2001-12-07 Renault Procede de commande de purge de moyens de stockage d'oxydes d'azote associes a un pot catalytique de traitement des gaz d'echappement d'un moteur a combustion interne
DE19945374A1 (de) 1999-09-22 2001-03-29 Volkswagen Ag Verfahren zur Funktionsüberwachung eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NO¶x¶-Sensors
US6632764B2 (en) 2000-01-19 2003-10-14 Volkswagen Ag Method for controlling the regeneration of an NOx storage converter
DE10003219A1 (de) * 2000-01-26 2001-08-02 Volkswagen Ag Verfahren und Vorrichtung zur Regelung eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NOx-Speicherkatalysators
DE10026379A1 (de) * 2000-05-27 2001-12-13 Volkswagen Ag Verfahren und Vorrichtung zur Durchführung einer Regeneration eines NOx-Speicherkatalysators
DE10034874B4 (de) * 2000-07-18 2004-01-22 Siemens Ag Verfahren zum Adaptieren einer NOx-Rohkonzentration
DE10035525A1 (de) * 2000-07-21 2002-02-07 Bosch Gmbh Robert Verfahren zum Betreiben eines Katalysators
CA2420418C (en) * 2000-08-29 2013-01-29 Eloquent Tool for collaborative edit/search of dynamic objects
DE10051012A1 (de) * 2000-10-14 2002-04-18 Bayerische Motoren Werke Ag Verfahren und Vorrichtung zum Diagnostizieren der Speichereigenschaften eines NOx-Speicherkatalysators
US6698188B2 (en) * 2000-12-08 2004-03-02 Toyota Jidosha Kabushiki Kaisha Emission control apparatus of internal combustion engine
DE10062289A1 (de) * 2000-12-14 2002-07-04 Siemens Ag Verfahren zur Diagnose eines NOx-Sensors im Abgastrakt einer Brennkraftmaschine
DE10114523B4 (de) * 2001-03-21 2009-11-26 Volkswagen Ag Verfahren zur Steuerung einer NOx-Regeneration eines im Abgasstrang einer Verbrennungskraftmaschine angeordneten NOx-Speicherkatalysators
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FR2849105B1 (fr) * 2002-12-18 2007-03-16 Renault Sa Procede de commande d'un moteur a combustion interne pour la regeneration de moyens de purification des gaz d'echappement et dispositif associe
DE10302244A1 (de) * 2003-01-22 2004-08-12 Audi Ag Verfahren zum Betreiben eines Stickoxid-Speicherkatalysators einer Brennkraftmaschine eines Fahrzeuges, insbesondere eines Kraftfahrzeuges
ITBO20030136A1 (it) * 2003-03-13 2004-09-14 Magneti Marelli Powertrain Spa Metodo per la stima del degrado della capacita' di
DE10326932A1 (de) * 2003-06-16 2005-01-27 Audi Ag Verfahren zur Überprüfung eines Stickoxid-Sensors einer einen Stickoxid-Speicherkatalysator aufweisenden Brennkraftmaschine
DE10349876A1 (de) 2003-10-25 2005-05-25 Daimlerchrysler Ag Brennkraftmaschine mit Abgasreinigungsanlage und Verfahren zur Reinigung des Abgases einer Brennkraftmaschine
DE10355037B4 (de) * 2003-11-25 2013-10-10 Robert Bosch Gmbh Verfahren zum Optimieren der Abgaswerte einer Brennkraftmaschine
DE102004049577A1 (de) * 2004-10-12 2006-04-20 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine, in deren Abgasbereich ein NOx-Speicherkatalysator und ein NOx-Sensor angeordnet sind, und Vorrichtung zur Durchführung des Verfahrens
KR100680792B1 (ko) * 2005-12-09 2007-02-08 현대자동차주식회사 질소산화물 제거 촉매와 촉매 여과 장치를 구비한ＮＯｘ－ＰＭ 동시 저감 장치의 재생 제어 방법 및 장치
DE102005062120B4 (de) * 2005-12-23 2016-06-09 Robert Bosch Gmbh Verfahren und Vorrichtung zur Überwachung eines Abgasnachbehandlungssystems
JP4729405B2 (ja) * 2006-01-20 2011-07-20 本田技研工業株式会社 触媒の劣化判定装置
CN101105427B (zh) * 2006-07-12 2010-05-12 比亚迪股份有限公司 一种三元催化器进行临界老化试验方法
JP4737010B2 (ja) * 2006-08-30 2011-07-27 トヨタ自動車株式会社 触媒劣化診断装置
US8474243B2 (en) * 2006-12-22 2013-07-02 Cummins, Inc. System for controlling regeneration of an adsorber
US8701390B2 (en) * 2010-11-23 2014-04-22 International Engine Intellectual Property Company, Llc Adaptive control strategy
US20140328726A1 (en) * 2011-05-24 2014-11-06 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification system
JP5790868B2 (ja) * 2012-03-07 2015-10-07 トヨタ自動車株式会社 内燃機関の排気浄化装置
US9051861B2 (en) * 2012-10-12 2015-06-09 Ford Global Technologies, Llc Regeneration method and motor vehicle

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209332A3 (de) * 2000-11-22 2004-06-09 Volkswagen Aktiengesellschaft Verfahren und Vorrichtungen zur Regeneration eines NOx-Speicherkatalysators
EP1640578A1 (de) * 2004-09-25 2006-03-29 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens
US7428809B2 (en) 2004-09-25 2008-09-30 Robert Bosch Gmbh Method for operating an internal combustion engine and a device for carrying out the method

Also Published As

Publication number Publication date
DE59903317D1 (de) 2002-12-12
CN1142819C (zh) 2004-03-24
EP1060003B1 (de) 2002-11-06
US6408615B1 (en) 2002-06-25
DE19808382A1 (de) 1999-09-02
CN1287505A (zh) 2001-03-14
JP2002504422A (ja) 2002-02-12
EP1060003A1 (de) 2000-12-20

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