EP1163431B1 - DISPOSITIF D'UTILISATION D'UN CATALYSEUR A ACCUMULATEUR DE NOx DANS DES MOTEURS A COMBUSTION INTERNE - Google Patents

DISPOSITIF D'UTILISATION D'UN CATALYSEUR A ACCUMULATEUR DE NOx DANS DES MOTEURS A COMBUSTION INTERNE Download PDF

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Publication number
EP1163431B1
EP1163431B1 EP00991568A EP00991568A EP1163431B1 EP 1163431 B1 EP1163431 B1 EP 1163431B1 EP 00991568 A EP00991568 A EP 00991568A EP 00991568 A EP00991568 A EP 00991568A EP 1163431 B1 EP1163431 B1 EP 1163431B1
Authority
EP
European Patent Office
Prior art keywords
exhaust
phase
regeneration
exhaust gas
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.)
Expired - Lifetime
Application number
EP00991568A
Other languages
German (de)
English (en)
Other versions
EP1163431A1 (fr
Inventor
Wilhelm Polach
Bernd Hupfeld
Thomas Wahl
Frank Brenner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1163431A1 publication Critical patent/EP1163431A1/fr
Application granted granted Critical
Publication of EP1163431B1 publication Critical patent/EP1163431B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel

Definitions

  • the invention relates to the operation of a NOx storage catalytic converter in internal combustion engines with a lean fuel / air mixture are operated.
  • Examples such internal combustion engines are operated lean Gasoline engines or diesel engines.
  • the storage capacity of the NOx catalyst is Depends on the load and decreases continuously. Takes that first phase too long, undesirable results Nitrogen oxide emissions. Too long a second phase results in increased HC and CO emissions.
  • Modeling in one or both phases requires one very high computational effort and thus represents high Motor control requirements.
  • Catalyst due to aging processes in its storage and Conversion behavior changed.
  • the invention addresses the problem to control the change between the two phases.
  • An advantage of the invention lies in the essential more uniform conditions of the regeneration phase.
  • Another advantage is a significantly reduced Computational effort in the control of loading and Regeneration of the catalyst ..
  • Another advantage is a simple possibility to check the exhaust gas treatment system and in the procedural adjustment of the tax strategy to a for example, catalyst behavior caused by aging.
  • Figure 1 shows the technical environment in which the invention their effect unfolds.
  • 2 shows temporal courses different signals.
  • Fig3 shows a modified Structure for realizing the invention and
  • Fig. 4 shows a Embodiment in the form of a flow chart.
  • FIG. 1 shows an internal combustion engine 1 a NOx storage catalytic converter 2, exhaust gas probes 3 and 4, one Control unit 5, a fuel metering means 6, and various sensors 7, 8, 9 for load L and speed n and possibly further operating parameters of the internal combustion engine such as temperatures, throttle valve position etc.
  • the control unit etc. Forms from the mentioned and possibly other input signals the control unit etc. Fuel metering signals with which the Fuel metering means 6 is controlled.
  • the Fuel metering means 6 can be used for a so-called Intake manifold injection as well Direct gasoline injection into the combustion chambers 1a of the individual Be designed cylinder.
  • the variation of Mixture composition can change the Injection pulse widths take place with which the Fuel metering is controlled.
  • the core of the In this environment, the method according to the invention relates to primarily the control unit 5 and the behind the Exhaust gas probe 4 arranged as a catalyst.
  • Fig. 2 represents the change in Fig. 2a Mixture composition lambda upstream of the catalytic converter (line 2a) in connection with the signal US of the rear exhaust gas probe 4 (Line 2b) and the NOx concentration (line 2c) behind that
  • the rear exhaust probe can, for example as an oxygen sensor, as a hydrocarbon sensor (HC sensor, as a carbon dioxide sensor (CO sensor) or as Nitrogen oxide sensor can be realized.
  • the signal is shown an oxygen sensor that detects a lack of oxygen high signal level and one with excess oxygen delivers low signal level.
  • the time t 62 For example, by exceeding the threshold of the signal of the rear probe can be determined.
  • the change in mixture composition shown leads to the fact that the internal combustion engine hydrocarbons and Carbon monoxide emitted as a reducing agent.
  • Emission of reducing exhaust components can do that Reducing agent also from a storage tank 11 via a Control unit 5 controlled valve 12 the exhaust gas before Catalyst are supplied. The engine can then be operated continuously with a lean mixture.
  • FIG. 3 A corresponding modification of the structure in FIG. 1 is shown in FIG Fig. 3 shown.
  • the Regeneration phase not modeled mathematically and therefore kept variable. Instead, each becomes Regeneration a predetermined, constant mass Fuel in the exhaust system in front of the catalytic converter brought in.
  • the storage phase is then in duration adapted to the regeneration phase. Will be mismatches by an exhaust gas probe arranged behind the catalytic converter determined and by influencing the length of the Injection phase reduced. This is the injection phase shortened if an exhaust gas probe towards the end of the Regeneration phase does not change sufficiently Concentration of an exhaust gas component signals. Kick one however, such a change too soon will Injection phase extended.
  • the catalyst behavior is as follows: exceeds the to be stored in the NOx storage in the storage phase Amount of aging capacity decreasing due to aging, this is caused by a reaction of the exhaust gas probe in the subsequent regeneration phase noticed and at Tax strategy considered.
  • FIG. 4 An embodiment of a method according to the invention is shown in Fig. 4.
  • Step 1 represents lean engine operation Mixture. That emitted by the engine in this operating phase NOx is absorbed by the storage catalytic converter.
  • the degree of filling of the storage catalytic converter is in the Step 2 calculated from engine operating parameters as it is known for example from DE 1 97 398 48.
  • control unit triggers a regeneration of the Storage catalytic converter. This is in steps 3 and 4 shown.
  • the predetermined one Reducing agent mass can in the exemplary embodiment of FIG. 3 from the tank 11 via the controllable valve 12 into the exhaust gas be metered in front of the storage catalytic converter.
  • step 7 extends the storage phase by increasing the threshold value SW-NOx.

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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Claims (1)

  1. Procédé de régénération d'un catalyseur accumulateur NOx (2) pour les gaz d'échappement de moteurs à combustion interne (1) selon lequel en cas d'excédent d'oxygène dans les gaz d'échappement, le catalyseur absorbe le composant NOx des gaz d'échappement pendant une phase d'accumulation et dans une phase de régénération, en cas de manque d'oxygène dans les gaz d'échappement, il se régénère par l'émission d'azote, selon lequel
    on commute alternativement entre les phases d'accumulation et les phases de régénération et
    une sonde de gaz d'échappement (4) installée en aval du catalyseur accumulateur NOx (2) signale une régénération complète du catalyseur accumulateur (2)
    caractérisé en ce que
    on génère le manque d'oxygène dans les gaz d'échappement pour régénérer le catalyseur accumulateur (2) par une masse déterminée, maintenue constante, de carburant dans les gaz d'échappement en amont du catalyseur accumulateur NOx (2) et
    la sonde de gaz d'échappement (4) influence la durée de la phase d'accumulation du composant NOx de façon à raccourcir cette phase d'accumulation si vers la fin de la phase de régénération, la sonde de gaz d'échappement (4) ne signale pas une modification suffisante de la concentration d'un composant des gaz d'échappement ou
    on prolonge la phase d'accumulation si la sonde des gaz d'échappement (4) signale de façon anticipée la variation de la concentration du composant des gaz d'échappement.
EP00991568A 1999-12-29 2000-12-29 DISPOSITIF D'UTILISATION D'UN CATALYSEUR A ACCUMULATEUR DE NOx DANS DES MOTEURS A COMBUSTION INTERNE Expired - Lifetime EP1163431B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19963624A DE19963624A1 (de) 1999-12-29 1999-12-29 Verfahren zum Betrieb eines NOx-Speicherkatalysators bei Brennkraftmaschinen
DE19963624 1999-12-29
PCT/DE2000/004635 WO2001049985A1 (fr) 1999-12-29 2000-12-29 DISPOSITIF D'UTILISATION D'UN CATALYSEUR A ACCUMULATEUR DE NOx DANS DES MOTEURS A COMBUSTION INTERNE

Publications (2)

Publication Number Publication Date
EP1163431A1 EP1163431A1 (fr) 2001-12-19
EP1163431B1 true EP1163431B1 (fr) 2003-11-26

Family

ID=7934900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00991568A Expired - Lifetime EP1163431B1 (fr) 1999-12-29 2000-12-29 DISPOSITIF D'UTILISATION D'UN CATALYSEUR A ACCUMULATEUR DE NOx DANS DES MOTEURS A COMBUSTION INTERNE

Country Status (7)

Country Link
US (1) US20020134075A1 (fr)
EP (1) EP1163431B1 (fr)
JP (1) JP2003519317A (fr)
KR (1) KR20010102422A (fr)
CN (1) CN1342244A (fr)
DE (2) DE19963624A1 (fr)
WO (1) WO2001049985A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1687336B (zh) * 2005-04-06 2010-10-13 上海纳克润滑技术有限公司 一种高温链条油复合添加剂及其制备方法
US8474243B2 (en) * 2006-12-22 2013-07-02 Cummins, Inc. System for controlling regeneration of an adsorber
DE102016219301A1 (de) * 2016-10-05 2018-04-05 Audi Ag Verfahren und Vorrichtung zur Abgasreinigung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3228006B2 (ja) * 1994-06-30 2001-11-12 トヨタ自動車株式会社 内燃機関の排気浄化要素劣化検出装置
DE19739848A1 (de) * 1997-09-11 1999-03-18 Bosch Gmbh Robert Brennkraftmaschine insbesondere für ein Kraftfahrzeug
DE19755600C2 (de) * 1997-12-15 2002-01-17 Bosch Gmbh Robert Betrieb eines Verbrennungsmotors in Verbindungmit einem NOx-Speicherkatalysator
DE19830829C1 (de) * 1998-07-09 1999-04-08 Siemens Ag Verfahren zur Regeneration eines NOx-Speicherkatalysators

Also Published As

Publication number Publication date
EP1163431A1 (fr) 2001-12-19
WO2001049985A1 (fr) 2001-07-12
CN1342244A (zh) 2002-03-27
DE19963624A1 (de) 2001-07-12
DE50004565D1 (de) 2004-01-08
US20020134075A1 (en) 2002-09-26
JP2003519317A (ja) 2003-06-17
KR20010102422A (ko) 2001-11-15

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