EP1258620B1 - Méthode de désulfatation d'un piège à NOx dans un moteur à combustion interne - Google Patents

Méthode de désulfatation d'un piège à NOx dans un moteur à combustion interne Download PDF

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Publication number
EP1258620B1
EP1258620B1 EP02007800A EP02007800A EP1258620B1 EP 1258620 B1 EP1258620 B1 EP 1258620B1 EP 02007800 A EP02007800 A EP 02007800A EP 02007800 A EP02007800 A EP 02007800A EP 1258620 B1 EP1258620 B1 EP 1258620B1
Authority
EP
European Patent Office
Prior art keywords
knock
fuel
sensitivity
fuel consumption
determined
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
EP02007800A
Other languages
German (de)
English (en)
Other versions
EP1258620A3 (fr
EP1258620A2 (fr
Inventor
Florian Preuss
Stefan Detterbeck
Hanns-Christian Hasenclever
Matthew Dr. Keenan
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP1258620A2 publication Critical patent/EP1258620A2/fr
Publication of EP1258620A3 publication Critical patent/EP1258620A3/fr
Application granted granted Critical
Publication of EP1258620B1 publication Critical patent/EP1258620B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock 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
    • F02D41/021—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
    • F02D41/028—Desulfurisation of NOx traps 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur 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
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0611—Fuel type, fuel composition or fuel quality
    • F02D2200/0612—Fuel type, fuel composition or fuel quality determined by estimation
    • 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
    • F02D2200/0818—SOx storage amount, e.g. for SOx trap or NOx trap

Definitions

  • the invention relates to a method for desulfating a NO x storage tank in an internal combustion engine according to the preamble of claim 1.
  • a sulfur loading model for the assessment of the extent is conventionally the sulfur incorporation in the NO x storage used, the sulfur loading model is usually designed so that even in predominant short distances and in city driving requested a artificial sufficiently early desulfurization and performed becomes.
  • a method for desulfating a NO x storage wherein the current values of NO x contained in the exhaust gas during the lean mode of the internal combustion engine based on the difference between a certain instantaneous concentration in the supplied gas and a predetermined NO x storage efficiency is calculated.
  • the lean mode is interrupted when the exhaust gas-containing NO x exceeds a predetermined threshold either instantaneously or averaged over a purge / fill cycle of the NO x storage.
  • the estimate of a quantity of sulfur that has accumulated in the memory can be determined from the determined instantaneous NO x capacity value of the memory.
  • Object of the present invention is to provide a method of the type mentioned with a needs-based desulfation available.
  • the approach in the present invention is the idea that there is a relationship between the knock sensitivity and the sulfur content of a fuel. In most cases, high-sulfur fuels are also less knock-resistant.
  • recognizing the knock-sensitive fuels it is thus possible to achieve an improvement of the model with regard to the current sulfur content in the tank, which in turn leads to a more accurate estimation of the degree of sulfurization and thus to a reduction in fuel consumption.
  • a normal model calculation as already known in the art, is used.
  • the knock signal or the knock control which is present in the engine control in most cases, evaluated and determines a knock sensitivity of the fuel.
  • the amount of fuel consumed, in particular during lean operation is determined and evaluated. On the fuel consumption can be closed, for example, the evaluation of injection operations or tank level evaluation. Of course, other options are conceivable, we can generally conclude on the fuel consumption. From the two parameters of sensitivity to knocking and fuel consumption, a variable can then be determined which is included in the model calculation and has the effect of desulfating at a fuel with a high tendency to knock at shorter intervals.
  • the desulfurization intervals are further selected.
  • a relation between the sensitivity to knocking and the concentration of sulfur in the fuel is stored in a characteristic diagram, with the concentration of sulfur being deduced depending on the tendency to knock.
  • the present invention thus makes it possible to carry out a need-based adaptation of the desulfurization steps in a simple and very cost-effective manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Treating Waste Gases (AREA)

Claims (5)

  1. Procédé de désulfatation d'une accumulateur d'oxydes NOx dans un moteur à combustion interne qui fonctionne, du moins en partie, dans un mode à échange pauvre, avec une modélisation pour déterminer une étape de désulfatation qui effectue une désulfatation à des intervalles plus courts pour un carburant ayant une grande tendance au cliquetis et à choisir les intervalles de désulfatation plus éloignés l'un de l'autre avec un carburant ayant moins tendance au cliquetis,
    caractérisé en ce qu'
    on analyse un signal de cliquetis ou un réglage du cliquetis et on détermine une sensibilité au cliquetis du carburant déterminée,
    on détermine une relation entre la sensibilité au cliquetis et à la concentration en soufre dans le carburant,
    on calcule une consommation de carburant, et
    la modélisation est réalisée en fonction de la sensibilité au cliquetis du carburant et de la consommation de carburant.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la consommation de carburant est déterminée pendant le fonctionnement à mélange pauvre.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    la consommation de carburant est déterminée depuis la dernière désulfatation.
  4. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la relation entre la sensibilité au cliquetis et la concentration en soufre est enregistrée dans un champ de caractéristiques ou une courbe caractéristique.
  5. Procédé selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce qu'
    à partir de la sensibilité au cliquetis et de la consommation de carburant, on détermine un paramètre de correction intégré dans la modélisation et qui modifie les périodes pour et/ou de désulfatation.
EP02007800A 2001-05-16 2002-04-06 Méthode de désulfatation d'un piège à NOx dans un moteur à combustion interne Expired - Lifetime EP1258620B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10123682 2001-05-16
DE10123682A DE10123682A1 (de) 2001-05-16 2001-05-16 Verfahren zur Desulfatisierung eines NOx-Speichers bei einem Verbrennungsmotor

Publications (3)

Publication Number Publication Date
EP1258620A2 EP1258620A2 (fr) 2002-11-20
EP1258620A3 EP1258620A3 (fr) 2005-04-13
EP1258620B1 true EP1258620B1 (fr) 2006-07-12

Family

ID=7684910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02007800A Expired - Lifetime EP1258620B1 (fr) 2001-05-16 2002-04-06 Méthode de désulfatation d'un piège à NOx dans un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP1258620B1 (fr)
AT (1) ATE333040T1 (fr)
DE (2) DE10123682A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4235069B2 (ja) * 2003-09-12 2009-03-04 トヨタ自動車株式会社 内燃機関の排気浄化触媒制御装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5657625A (en) * 1994-06-17 1997-08-19 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Apparatus and method for internal combustion engine control
JP2000073925A (ja) * 1998-09-03 2000-03-07 Nippon Soken Inc ノック制御装置
US6116208A (en) * 1998-09-29 2000-09-12 Mazda Motor Corporation Control system for a direct injection-spark ignition engine
DE10018333A1 (de) * 1999-05-19 2000-11-23 Ford Global Tech Inc Verfahren und System zur Reduzierung von NO¶x¶-Abgasemissionen eines Magermix-Innenverbrennungsmotors

Also Published As

Publication number Publication date
EP1258620A3 (fr) 2005-04-13
DE50207467D1 (de) 2006-08-24
ATE333040T1 (de) 2006-08-15
DE10123682A1 (de) 2002-12-19
EP1258620A2 (fr) 2002-11-20

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