EP1188915A2 - Procédé de réglage de la régénération d'un catalyseur d'accumulation de NOx - Google Patents

Procédé de réglage de la régénération d'un catalyseur d'accumulation de NOx Download PDF

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Publication number
EP1188915A2
EP1188915A2 EP01119751A EP01119751A EP1188915A2 EP 1188915 A2 EP1188915 A2 EP 1188915A2 EP 01119751 A EP01119751 A EP 01119751A EP 01119751 A EP01119751 A EP 01119751A EP 1188915 A2 EP1188915 A2 EP 1188915A2
Authority
EP
European Patent Office
Prior art keywords
regeneration
catalytic converter
storage catalytic
storage
lambda
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
EP01119751A
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German (de)
English (en)
Other versions
EP1188915A3 (fr
EP1188915B1 (fr
Inventor
Ekkehard Dr. Pott
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
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Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP1188915A2 publication Critical patent/EP1188915A2/fr
Publication of EP1188915A3 publication Critical patent/EP1188915A3/fr
Application granted granted Critical
Publication of EP1188915B1 publication Critical patent/EP1188915B1/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
    • 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
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • 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
    • 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
    • F02D2200/0808—NOx storage capacity, i.e. maximum amount of NOx that can be stored on NOx trap

Definitions

  • the invention relates to a method for controlling a NO x regeneration of a NO x storage catalytic converter with the features mentioned in the preamble of claim 1.
  • the same catalyst systems for cleaning an exhaust gas from internal combustion engines, it is known to arrange the same catalyst systems in the exhaust line, which decompose the pollutant components of the exhaust gas into less environmentally relevant products.
  • the pollutant components are reducing agents such as carbon monoxide CO or incompletely burned hydrocarbons, they can, if there is sufficient oxygen, be oxidized to carbon dioxide and water in so-called oxidation catalysts. It is also known to convert nitrogen oxides NO x formed during the combustion process back to nitrogen using the reducing agents.
  • reduction catalysts have been developed which, if the reducing agents are provided to a sufficient extent, allow the NO x to be converted almost completely.
  • a mass flow of reducing agent as well as an extent of NO x formation during the combustion process depend strongly on the mixture ratios prevailing during the combustion. In phases of rich or stoichiometric operation, a largely complete implementation on the NO x is guaranteed. If, however, the system is switched to lean operation, the NO x reduction is reduced due to an excess of oxygen. Since lean operation has proven to be particularly economical, but high NO x emissions should be avoided for environmental reasons, NO x storage components have been developed to remedy this. Such storage components sorb NO x in phases of lean operation and store this as nitrate. When changing to rich or stoichiometric operation, the NO x is desorbed again.
  • the catalyst component for reducing the NO x and the storage component can be combined to form a so-called NO x storage catalyst.
  • a storage capacity of the NO x storage catalytic converter is naturally limited. Such a NO x storage catalytic converter must therefore be regenerated at regular intervals. The NO x regeneration takes place by changing to stoichiometric or rich operation, the stored nitrate being desorbed again as NO x and reduced to nitrogen on the catalyst component with the aid of the reducing agents.
  • the NO x regeneration in NO x storage catalytic converter systems is initiated, for example, after reaching a predefined NO x loading state or after exceeding a predefined NO x concentration downstream of the NO x storage catalytic converter. If there is a need for regeneration, a mass flow of reducing agent is increased by a motor intervention, for example in the area of the throttle valves or the injection system. The increase is usually achieved by lowering a lambda value upstream of the NO x storage catalytic converter to a predetermined rich setpoint.
  • the NO x regeneration is generally terminated when the lambda value, or a lambda proportional voltage correlating therewith, on a gas probe arranged downstream of the NO x storage catalytic converter exceeds a predetermined threshold value (regeneration termination voltage threshold).
  • a predetermined threshold value (regeneration termination voltage threshold).
  • Both the regeneration termination voltage threshold and the rich target value for lambda during NO x regeneration are defined in the prior art regardless of the catalytic converter state. This is associated with the risk that the NO x regeneration of aged, ie damaged, NO x storage catalytic converters is not carried out as required.
  • very large reducing agent mass flows and low regeneration termination voltage thresholds only a partial regeneration of the NO x storage catalytic converter can be expected.
  • the high reducing agent mass flow is only partially used for NO x regeneration and thus shortly after the start of the NO x regeneration, a slightly rich exhaust gas passes through the NO x storage catalytic converter and leads to the termination of the NO x regeneration.
  • this object is achieved by the method for regulating a NO x regeneration of a NO x storage catalytic converter arranged in the exhaust line of a lean-burn internal combustion engine with the features mentioned in claim 1.
  • a damage state of the NO x storage catalytic converter is detected and, depending on the damage condition, a reducing agent mass flow during the NO x regeneration and / or a regeneration termination voltage threshold of a determining lambda gas probe arranged downstream of the NO x storage catalytic converter are specified.
  • the parameters determining the NO x regeneration can be adapted to the actual catalyst state and an almost complete NO x regeneration can be ensured.
  • the damage state of the NO x storage catalytic converter is assessed on the basis of a current NO x storage capacity in comparison to an NO x storage capacity of an undamaged NO x storage catalytic converter.
  • the NO x storage capacity can be determined using known models on the basis of the signals of the exhaust gas cleaning system provided by the sensors. Here, variables such as a current NO x loading state and a remaining NO x storage capacity can be taken into account.
  • the regeneration termination voltage threshold can be increased. The former measure reduces the likelihood of reducing agent mass breakthroughs, since an almost complete conversion in the NO x storage catalytic converter is still ensured even at high space velocities of the exhaust gas. By increasing the regeneration termination voltage threshold, a higher NO x breakthrough emission can be tolerated in addition or in combination.
  • the exhaust gas purification system 12 comprises at least one NO x storage catalytic converter 14 and a suitable sensor system for detecting operating parameters in the exhaust line 16.
  • This sensor system includes downstream and upstream of the NO x Storage catalytic converter 14 arranged gas probes, here the lambda probes 18, 20 and a NO x sensitive measuring device 22.
  • the signals provided by the sensors are fed into an engine control unit 24 imported and evaluated there using stored algorithms.
  • About the Engine control unit 24 can then perform a control intervention to change the during a Combustion process of the internal combustion engine 10 prevailing conditions respectively.
  • a throttle valve 26 in an intake duct is an example of an actuator here 28 shown.
  • a change can then be made by changing a throttle valve angle Intake volume of the internal combustion engine 10 are influenced.
  • interventions in the combustion process especially one not here shown injection system - by varying injection parameters, such as one Injection duration, injection angle, injection volume and the like. Procedure and Devices for carrying out such control interventions are well known and are therefore not explained in more detail here. All that remains to be said is that in this way, a reducing agent mass flow is specifically increased or decreased can be.
  • the engine control unit 24 is also integrated into a control unit 30, with which one Adaptation of a regeneration termination voltage threshold and / or the Reductant mass flow depending on a catalyst state can. For this purpose, a corresponding algorithm is stored in the control unit 30.
  • the Control unit 30 can of course also be implemented as an independent unit become.
  • the catalyst state can also be quantified using a model and made available to the further process, for example, as a percentage degree of damage.
  • a current NO x storage capacity that is to say the NO x mass, which can be maximally sorbed by the NO x storage catalytic converter 14, serves in particular as the evaluation criteria.
  • the NO x storage capacity can in turn be determined with the aid of known models in which a NO x mass flow upstream of the NO x storage catalytic converter 14 is detected and a NO x breakthrough emission downstream of the NO x storage catalytic converter is checked.
  • the current catalytic converter state can then be characterized, for example, as 85% of a fresh NO x storage catalytic converter.
  • FIG. 2 shows, for a fresh and a damaged NO x storage catalytic converter 14, on the one hand a voltage curve at the downstream lambda probe 20 and on the other hand target values SV i for lambda upstream of the NO x storage catalytic converter 14 and regeneration termination voltage thresholds S i .
  • the voltage curve at the lambda probe 20 during the NO x regeneration of a fresh NO x storage catalytic converter is given by the curve 40 (bold solid line) and for the already damaged NO x storage catalytic converter by the curve 42 (dashed line).
  • the internal combustion engine 10 then changes to a rich working mode, so that the NO x storage catalytic converter 14 is subjected to an increased mass flow of reducing agent.
  • the target specifications SV i which are specified during this rich regeneration phase of the internal combustion engine 10 by suitably influencing the actuators for the lambda value upstream of the NO x storage catalytic converter 14, are dependent on the catalytic converter state. The same applies to the regeneration termination voltage thresholds S i , when they reach lambda probe 20, lean operation of internal combustion engine 10 is resumed.
  • a curve 44 shows the target profile of lambda during NO x regeneration of a fresh NO x storage catalytic converter 14 (double, solid line).
  • the curve 40 for the voltage signal at the lambda probe 20 shows a rapid increase, which results from the sudden increase in the reducing agent breakthrough emission. If the voltage reaches a regeneration termination voltage threshold S 1 , for example at 650 mV (time T E, 1 ), the internal combustion engine 10 is switched back to lean operation.
  • the mass flow of reducing agent is reduced. This is done by appropriately specifying a target specification SV 2 for the rich regeneration phase - here, for example, to a lambda value of approximately 0.92. As a result of this, the mass flow of reducing agent also drops, so that it can be prevented that a slightly rich exhaust gas passes through the NO x storage catalytic converter 14 shortly after the start of the NO x regeneration and that the NO x regeneration is possibly incompletely terminated. Furthermore, the regeneration termination voltage threshold S 2 is also raised for this catalyst state in the present case.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
EP20010119751 2000-09-15 2001-08-28 Procédé de réglage de la régénération d'un catalyseur d'accumulation de NOx Expired - Lifetime EP1188915B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000145610 DE10045610A1 (de) 2000-09-15 2000-09-15 Verfahren zur Regelung einer NOx-Regeneration eines NOx-Speicherkatalysators
DE10045610 2000-09-15

Publications (3)

Publication Number Publication Date
EP1188915A2 true EP1188915A2 (fr) 2002-03-20
EP1188915A3 EP1188915A3 (fr) 2004-01-07
EP1188915B1 EP1188915B1 (fr) 2005-11-16

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ID=7656276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010119751 Expired - Lifetime EP1188915B1 (fr) 2000-09-15 2001-08-28 Procédé de réglage de la régénération d'un catalyseur d'accumulation de NOx

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EP (1) EP1188915B1 (fr)
DE (2) DE10045610A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1475636A1 (fr) * 2003-05-07 2004-11-10 DaimlerChrysler AG Méthode pour déterminer la concentration de gaz dans le gaz d'échappement d'un moteur à combustion interne
WO2008029256A3 (fr) * 2006-09-06 2008-05-22 Toyota Motor Co Ltd Appareil de commande de rapport air-carburant et procédé de commande de rapport air-carburant pour moteur à combustion interne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019200367A1 (de) * 2019-01-15 2020-07-16 Ford Global Technologies, Llc Verfahren zum Bestimmen von Regenerationsparameterwerten eines Mehrfach-LNT-Katalysatorsystems und Vorrichtung zur Datenverarbeitung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903479A2 (fr) * 1997-09-19 1999-03-24 Toyota Jidosha Kabushiki Kaisha Dispositif de purification de gaz d'échappement pour moteur à combustion interne
EP0928890A2 (fr) * 1998-01-10 1999-07-14 Degussa Aktiengesellschaft Procédé d'exploitation d'un catalyseur de stockage de NOx
WO1999035386A1 (fr) * 1998-01-09 1999-07-15 Ford Global Technologies, Inc. Procede de regeneration d'un piege d'oxyde d'azote dans le systeme d'echappement d'un moteur a combustion interne
DE19918875A1 (de) * 1998-04-27 1999-10-28 Denso Corp Luftkraftstoffverhältnisregelsystem für eine Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903479A2 (fr) * 1997-09-19 1999-03-24 Toyota Jidosha Kabushiki Kaisha Dispositif de purification de gaz d'échappement pour moteur à combustion interne
WO1999035386A1 (fr) * 1998-01-09 1999-07-15 Ford Global Technologies, Inc. Procede de regeneration d'un piege d'oxyde d'azote dans le systeme d'echappement d'un moteur a combustion interne
EP0928890A2 (fr) * 1998-01-10 1999-07-14 Degussa Aktiengesellschaft Procédé d'exploitation d'un catalyseur de stockage de NOx
DE19918875A1 (de) * 1998-04-27 1999-10-28 Denso Corp Luftkraftstoffverhältnisregelsystem für eine Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1475636A1 (fr) * 2003-05-07 2004-11-10 DaimlerChrysler AG Méthode pour déterminer la concentration de gaz dans le gaz d'échappement d'un moteur à combustion interne
WO2008029256A3 (fr) * 2006-09-06 2008-05-22 Toyota Motor Co Ltd Appareil de commande de rapport air-carburant et procédé de commande de rapport air-carburant pour moteur à combustion interne

Also Published As

Publication number Publication date
EP1188915A3 (fr) 2004-01-07
DE50108067D1 (de) 2005-12-22
DE10045610A1 (de) 2002-04-18
EP1188915B1 (fr) 2005-11-16

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