EP1252420A1 - Dispositif et procede de commande d'une regeneration de nox d'un catalyseur accumulateur de nox - Google Patents

Dispositif et procede de commande d'une regeneration de nox d'un catalyseur accumulateur de nox

Info

Publication number
EP1252420A1
EP1252420A1 EP01942402A EP01942402A EP1252420A1 EP 1252420 A1 EP1252420 A1 EP 1252420A1 EP 01942402 A EP01942402 A EP 01942402A EP 01942402 A EP01942402 A EP 01942402A EP 1252420 A1 EP1252420 A1 EP 1252420A1
Authority
EP
European Patent Office
Prior art keywords
regeneration
catalytic converter
lean
storage catalytic
internal combustion
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.)
Granted
Application number
EP01942402A
Other languages
German (de)
English (en)
Other versions
EP1252420B1 (fr
Inventor
Ekkehard Pott
Sören HINZE
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 EP1252420A1 publication Critical patent/EP1252420A1/fr
Application granted granted Critical
Publication of EP1252420B1 publication Critical patent/EP1252420B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02D41/02—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
    • F02D41/1461—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 emitted by the engine
    • 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
    • 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
    • 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
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
    • 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
    • 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
    • F02D2200/0811—NOx storage efficiency

Definitions

  • the invention relates to a device and a method for controlling a NO x regeneration of a NO x storage catalytic converter arranged in the exhaust line of an internal combustion engine for motor vehicles with the features mentioned in the independent claims
  • pollutants such as carbon monoxide CO, unburned hydrocarbons HC or nitrogen oxides NO x are produced to different extents.
  • oxidation catalysts converts to carbon dioxide and water.
  • NO x is reduced by the reducing agents CO and HC on the NO x storage catalyst.
  • the catalyst is assigned a so-called NO x storage device which absorbs the NO x under these conditions (summarized with the catalyst component to form the NO x storage catalyst).
  • a storage capacity of the NO x storage catalytic converter is naturally limited, so that a NO x regeneration must be initiated at regular intervals by changing to a rich atmosphere.
  • a rich target value is usually specified for this purpose, until a downstream of the NO x Lambda probe arranged below a predetermined rich threshold value Then normal operation of the internal combustion engine is resumed
  • the object of the present invention is therefore to provide an apparatus and a method with which the NO x regeneration can be controlled in such a way that a complete emptying of the NO x store is ensured.
  • the device has means with which the aforementioned method steps can be carried out.
  • These means can include a control device in which a procedure for controlling the multiple NO x regeneration is stored in digitized form.
  • the control device can be integrated into an already frequently existing engine control device become
  • the multiple NO x regeneration is preferably implemented in that a NO x storage catalytic converter is initially charged n times with an exhaust gas in accordance with a rich target specification (rich phases).
  • the lean target specification can also be specified as a function of the value of the rich target specification.
  • Such a lean target specification is preferably to be selected to be at least 0.04 units larger than the rich target specification.
  • the number (n) of fat phases can in principle be predefined. However, it has proven to be advantageous to determine this as a function of the extent of the deviation in the state parameters. If, for example, the absorbency of the current lean phase has dropped significantly compared to a previous lean phase, the number is consequently increased. In order to prevent an increase against infinity, this number can preferably be limited by specifying a maximum value.
  • the success of previous multiple NO x regenerations can also be taken into account. This can be done, for example, by comparing the state parameters before and after the previous multiple NO x regeneration. If the multiple NO x regeneration has not led to an improvement in the storage properties of the NO x storage catalytic converter to the desired extent, the number of rich phases for the next multiple NO x regeneration can be increased.
  • Such a determination can be implemented in a particularly preferred and simple manner by specifying threshold values for the success of the previous multiple NO x regeneration. If these threshold values are undershot, the number (n) is then increased. A reduction in the number (n) of the fat phases can of course take place in the same way per se, in that the number is reduced again in the case of previous "successful multiple NO x regeneration", of course only up to a minimum number of two fat phases.
  • FIG. 1 is a schematic diagram of an internal combustion engine with an exhaust gas purification system that includes a NO x storage catalyst;
  • FIG. 2 shows a curve of an absorption capacity as a function of a NO x .
  • FIG. 3 shows a course of a NO x breakthrough emission as a function of time
  • FIG. 4 shows the course of the air conditions downstream and upstream of the NO x .
  • Figure 5 is a flowchart for controlling the multiple NO x regeneration
  • FIG. 1 schematically shows an internal combustion engine 10 with an exhaust gas cleaning system 14 arranged in the exhaust line 12.
  • the exhaust gas cleaning system 14 comprises a pre-catalytic converter 16, for example in the form of a three-way catalytic converter and a NO x storage catalytic converter 18 arranged downstream thereof.
  • the exhaust line 12 is equipped with a sensor This allows the local air conditions, gas compositions and temperatures to be recorded.
  • a sensor 24 is, for example, a lambda probe, which then provides information about an air ratio directly after the internal combustion engine 10 there is the gas sensor 26 carries a NO x sensor measuring device, so that NO x emissions downstream of the NO x storage catalytic converter 18 (NO x breakthrough emissions) can be detected.
  • NO x sensor usually also enables a g simultaneous determination of the air conditions, thus provides a lambda value downstream of the NO x storage catalytic converter 18
  • the signals detected by the Sensonk are usually passed on to an engine control unit 28.
  • the engine control unit 28 can, among other things, store procedures in digital form that allow control of a combustion process in the internal combustion engine 10 Intake volume in an intake manifold 32 with a throttle valve 34 and an injection system (not shown here) are influenced in such a way that rich, stoichiometric or lean mixtures are set up. Such a control is known and is therefore not to be explained in more detail here
  • the catalyst has a NO x storage device which binds NO x as nitrate. Diffusion causes the nitrate to migrate into deeper layers of the NO storage with increasing duration of the lean phase. For complete NO x regeneration, the nitrate bound in the deeper layers must be therefore first diffuse in the direction of an interface between the exhaust gas and the NO x storage catalyst 18. Since this process is much slower than the reaction with the reducing agents CO and HC, there is a diffusion inhibition at the end of the NO x regeneration To ensure constant emptying of the NO x storage device, proceed as follows
  • At least one state parameter of the NO x storage catalyst 18 is determined on the basis of the measured or calculated NO x raw emissions m ro h and the NO x breakthrough emissions m detected by the NO x sensitive measuring device Deviation of the state parameters of a current lean operating phase and the state parameters in a previous lean operating phase are determined and, if there is a need for regeneration of the NO x storage catalyst 18, the NO x regeneration is carried out n times as a function of the deviation (multiple NO x regeneration)
  • a NO x absorption factor A of the NO x storage catalytic converter 18 with a predetermined NO x raw emission m r0 h / ⁇ is suitable as the state parameter, for example.
  • the determination of a deviation ⁇ A j can be seen in FIG. 2.
  • the NO x absorption capacity A also decreases increasing raw emission m ron
  • the NO x absorption factor A can ideally reach a value of 1, that is to say the entire raw emission is bound in the NO x storage catalytic converter 18 and no breakthrough emission m
  • the absorption capacity A drops, since the nitrate bound to the interface must first diffuse into deeper layers of the NO x storage.
  • Curve 40 shows a curve of absorption capacity A with a fresh and unloaded NO x storage catalytic converter 18
  • Curve 42 shows the course of the absorption capacity A in a NO x storage catalytic converter 18, the storage capacity of which is already reduced compared to the fresh state, for example by thermal damage or sulfur loading.
  • the curve 44 has been recorded in time following the curve 42, and here is the absorption capacity further reduced In intersections 46, 48, 50 with the given raw emission m ron , the values AQ, A 'and A "for the absorption capacity are available.
  • FIG. 3 shows the time course of the breakthrough emission m of a fresh storage catalytic converter (curve 52), a course in a current lean phase (curve 56) and a course in a previous lean phase (curve 54)
  • the time interval t begins with a complete regeneration (NO x - or SO x regeneration) and ends when a predetermined breakthrough emission m ⁇ is reached.
  • the intersections 58, 60, 62 with the curves 52, 54, 56 therefore make it possible to determine the time intervals Determine tg, t 'and t "By forming the difference, one obtains a deviation ⁇ t- j between the time intervals t' and t"
  • the deviations ⁇ A- j , ⁇ t- j can be read into a map whose output size is a number n of the fat phases of the multiple NO x regeneration is at very small deviations ⁇ A-], ⁇ t-
  • n is set to the value 1, so that the NO x regeneration is carried out in a manner known per se
  • the solid bold line represents the lambda value in front of the NO x storage catalytic converter 18, and the dashed line shows the course of the lambda value downstream of it
  • the internal combustion engine 10 is operated under lean conditions, the state parameters being continuously ascertained in the aforementioned manner.
  • a change to a first rich phase by regulating the internal combustion engine 10 to a rich target specification SVf.
  • the absorbed NO x is converted in the area the interface and the interface of nearby layers of the NO x storage instead of From a point in time T2 ⁇ continues to decrease.
  • the reducing agents CO and HC formed to an increased extent by the change in a rich atmosphere are therefore no longer used in full to reduce NO x
  • a lean exhaust gas is again provided on the engine side, namely in accordance with a lean target value SV m - j.
  • the NO x -Rohem ⁇ ss ⁇ on m ro f- emitted by the internal combustion engine 10 is relatively low or can be largely compensated for by the reducing agents CO, HC still present, so that a new absorption in the NO x storage takes place only to a very small extent
  • a number n of the fat phases during the multiple NO x regeneration can preferably be determined in such a way that a value is output with the aid of the characteristic diagram as a function of a height of the deviations (for example ⁇ A-], ⁇ t ⁇ ).
  • a value is output with the aid of the characteristic diagram as a function of a height of the deviations (for example ⁇ A-], ⁇ t ⁇ ).
  • the number n depending on the state parameters A, m, t, m raw before ur
  • a corresponding multiple NO x regeneration is to be determined from FIG. 5.
  • a corresponding flowchart can be seen in FIG. 5.
  • step S1 the extent to which the state parameters of a current lean phase differ from a previous lean phase is recorded If there is only a slight deviation, the number n is set to 1 (step S2) and a NO x regeneration of a conventional type is carried out. With larger deviations, the number n is set to a value greater than 1 (step S3)
  • step S4 it is checked whether a previous multiple NO x regeneration has been successfully carried out.
  • the state parameters before and after the multiple NO x regeneration are compared, with an increasing success, in principle, with increasing positive deviation , ie a larger NO x storage capacity is available for the next lean phase.
  • Such a query can be carried out in such a way that threshold values S ⁇ N j ⁇ , SW

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)

Abstract

L'invention concerne un procédé de commande d'une régénération de NOX d'un catalysateur accumulateur de NOX placé dans la ligne d'échappement d'un moteur à combustion interne de véhicules automobiles. Selon ce procédé, (a) on détermine, dans chaque phase de fonctionnement à mélange pauvre du moteur à combustion interne, au moins un paramètre d'état du catalysateur accumulateur de NOX à l'aide d'une émission brute de NOX (mbrut) mesurée ou calculée du moteur à combustion interne et d'une émission de restitution de NOX (m) détectée en aval dans les gaz d'échappement par un dispositif de mesure sensible aux NOX; (b) on détermine tout écart entre les paramètres d'état d'une phase de fonctionnement actuelle à mélange pauvre et les paramètres d'état d'une phase de fonctionnement à mélange pauvre précédente et (c) en cas de besoin d'une régénération, la régénération de NOX est effectuée n fois (régénération multiple de NOX) en fonction de l'écart. L'invention concerne également un dispositif possédant des moyens destinés à mettre en oeuvre de procédé.
EP01942402A 2000-01-14 2001-01-10 Dispositif et procede de commande d'une regeneration de nox d'un catalyseur accumulateur de nox Expired - Lifetime EP1252420B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2000101310 DE10001310A1 (de) 2000-01-14 2000-01-14 Vorrichtung und Verfahren zur Steuerung einer NOx-Regeneration eines NOx-Speicherkatalysators
DE10001310 2000-01-14
PCT/EP2001/000242 WO2001051778A1 (fr) 2000-01-14 2001-01-10 Dispositif et procede de commande d'une regeneration de nox d'un catalyseur accumulateur de no¿x?

Publications (2)

Publication Number Publication Date
EP1252420A1 true EP1252420A1 (fr) 2002-10-30
EP1252420B1 EP1252420B1 (fr) 2005-11-16

Family

ID=7627493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01942402A Expired - Lifetime EP1252420B1 (fr) 2000-01-14 2001-01-10 Dispositif et procede de commande d'une regeneration de nox d'un catalyseur accumulateur de nox

Country Status (3)

Country Link
EP (1) EP1252420B1 (fr)
DE (2) DE10001310A1 (fr)
WO (1) WO2001051778A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10217455B4 (de) * 2002-04-19 2010-01-07 Audi Ag Verfahren zum Betrieb eines NOx-Adsorbers sowie NOx-Adsorber-Steuerung
DE10226873B4 (de) * 2002-06-12 2012-05-31 Volkswagen Ag Verfahren zur Steuerung der Betriebsartenwahl einer Verbrennungskraftmaschine
DE10249609B4 (de) * 2002-10-18 2011-08-11 Volkswagen AG, 38440 Verfahren zur Steuerung eines NOx-Speicherkatalysators
DE102004011582B4 (de) * 2004-03-10 2011-04-14 Audi Ag Verfahren zur Verringerung der Abgasemissionen von Kraftfahrzeugverbrennungsmotoren sowie Kraftfahrzeug
GB2484505A (en) * 2010-10-12 2012-04-18 Gm Global Tech Operations Inc Method and apparatus for regeneration of lean NOx trap in an internal combustion engine

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Publication number Priority date Publication date Assignee Title
DE69326217T3 (de) * 1992-06-12 2009-11-12 Toyota Jidosha Kabushiki Kaisha, Toyota-shi Abgasemissionssteuerungssystem für verbrennungsmotoren
DE4415650C2 (de) * 1994-05-04 1997-04-03 Daimler Benz Ag Verfahren zur Beeinflussung der Zeitdauer bis zum Erreichen der Aktivierungstemperatur einer im Abgasstrang einer luftverdichtenden Einspritzbrennkraftmaschine angeordneten Abgasreinigungsvorrichtung
DE19716275C1 (de) * 1997-04-18 1998-09-24 Volkswagen Ag Verfahren zur Stickoxidreduzierung im Abgas einer Brennkraftmaschine
DE19750226C1 (de) * 1997-11-13 1998-10-29 Daimler Benz Ag Motorregelsystem für einen Dieselmotor
DE19753718C1 (de) * 1997-12-04 1999-07-08 Daimler Chrysler Ag Verfahren zum Betreiben eines Dieselmotors
DE19800665C1 (de) * 1998-01-10 1999-07-01 Degussa Verfahren zum Betreiben eines Stickoxid-Speicherkatalysators
DE19823921A1 (de) * 1998-05-28 1999-12-02 Siemens Ag Verfahren zur Überprüfung des Wirkungsgrades eines NOx-Speicherkatalysators
DE19823923C2 (de) * 1998-05-28 2003-04-17 Siemens Ag Verfahren zur Stickoxidreduzierung im Abgas einer Brennkraftmaschine
DE19828609A1 (de) * 1998-06-26 1999-12-30 Siemens Ag Verfahren zur Regeneration eines NO¶x¶-Speicherkatalysators für eine Brennkraftmaschine
DE19830829C1 (de) * 1998-07-09 1999-04-08 Siemens Ag Verfahren zur Regeneration eines NOx-Speicherkatalysators

Non-Patent Citations (1)

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Title
See references of WO0151778A1 *

Also Published As

Publication number Publication date
WO2001051778A1 (fr) 2001-07-19
DE10001310A1 (de) 2001-07-19
DE50108080D1 (de) 2005-12-22
EP1252420B1 (fr) 2005-11-16

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