EP1479894B1 - Procédé de fonctionnement d'un moteur à combustion interne - Google Patents

Procédé de fonctionnement d'un moteur à combustion interne Download PDF

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Publication number
EP1479894B1
EP1479894B1 EP04102086A EP04102086A EP1479894B1 EP 1479894 B1 EP1479894 B1 EP 1479894B1 EP 04102086 A EP04102086 A EP 04102086A EP 04102086 A EP04102086 A EP 04102086A EP 1479894 B1 EP1479894 B1 EP 1479894B1
Authority
EP
European Patent Office
Prior art keywords
lambda
value
operating mode
predetermined
oxygen
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
EP04102086A
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German (de)
English (en)
Other versions
EP1479894A1 (fr
Inventor
Michael Zillmer
Ekkehard Pott
Matthias Holz
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
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Volkswagen AG
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Publication date
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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
    • F02D41/021—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
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period
    • 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
    • F02D2200/0802—Temperature of the 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
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F02D2200/0804—Estimation of the temperature of the 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
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—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 exhaust temperatures
    • 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

Definitions

  • the invention relates to a method for operating an internal combustion engine, in particular a gasoline engine, in particular a motor vehicle, with at least one catalyst arranged in an exhaust system, wherein the internal combustion engine optionally in a stoichiometric operation with an air-fuel ratio lambda substantially equal to 1, in one lean operating mode is operated with an air-fuel ratio lambda greater than 1, in an unfired overrun mode or in a stoichiometric operation with an air-fuel ratio lambda less than 1, according to the preamble of claim 1.
  • the exhaust gas is passed over at least one catalyst which performs a conversion of one or more pollutant components of the exhaust gas.
  • catalysts Different types of catalysts are known. Oxidation catalysts promote the oxidation of unburned hydrocarbons (HC) and carbon monoxide (CO), while reduction catalysts promote the reduction of nitrogen oxides (NO x ) of the exhaust gas.
  • 3-way catalysts are used to simultaneously catalyze the conversion of the three aforementioned components (HC, CO, NO x ).
  • storage catalytic converters for example NO x storage catalysts , are also known.
  • the NO x storage catalysts used in lean-running gasoline engines for exhaust gas purification have lower high-temperature stability in the current state of development compared to 3-way conventional catalysts.
  • the use of this catalyst technique therefore requires special efforts to limit the thermal loading of these catalysts.
  • measures come into consideration, which lead to the reduction of the stationary temperature levels, such as the exhaust gas cooling or the reduction of the residual oxygen content of the exhaust gases by optimizing the combustion process.
  • measures are appropriate here as well as for 3-way systems, which lead to a reduction of load during transient engine operation, such as the optimization of the application in terms of HC peaks.
  • the exhaust gas contains substoichiometric engine operation high concentrations of combustible components (HC, CO, H 2 ), it comes to violent oxidation reactions that can lead at least locally to exceeding the maximum allowable temperature of the coating even at a sufficiently high base temperature level of the catalyst.
  • the invention is based on the object, a method of o.g. To make available type, in which thermal load peaks in the field of exhaust aftertreatment device are safely reduced in certain operating situations of an internal combustion engine.
  • the value of lambda for a predetermined or defined by the signal of an oxygen-sensitive measuring device time is chosen such deviating from a value specified for the substoichiometric operation, that in Period after the transition, the sum of thermal and chemical energy input into the catalyst leads to a minimal increase in temperature in the catalyst.
  • the thermal energy input includes, for example, an energy input by a high-temperature exhaust gas mass flow (exhaust gas enthalpy) and the chemical energy input includes, for example, an energy input by chemical reactions due to the release and reaction of oxygen, which was stored in the previous operation in a layer of the catalyst.
  • the value of lambda greater than the value specified for the substoichiometric operation and less than 1.0 is selected.
  • a constant value in the range from 0.88 to 0.98, in particular 0.93 to 0.97, is selected during the predetermined time interval or lambda defined by the signal of an oxygen-sensitive measuring device.
  • the time duration for the specification of the lambda curve can be predetermined or determined by the signal of an oxygen-sensitive measuring device.
  • the time required for the emptying of the catalyst O 2 memory can be determined.
  • the lambda value deviating from the value specified for the substoichiometric operation jumps to the lambda value predetermined for the substoichiometric operation.
  • the lambda value deviating from the value specified for the substoichiometric operation is changed to the lambda value specified for the substoichiometric operation in accordance with a continuously differentiable function.
  • the present invention optimizes tuning of the individual energy inputs in a catalytic converter of an internal combustion engine during the transition from an operation with excess air to an operation with substoichiometric air-fuel ratio lambda. This makes it possible, in particular when resuming the firing of working cylinders after an overrun to match the thermal load of the catalyst by the enthalpy of the hot exhaust gases and the heat generated in the exhaust chemical energy so that in the catalyst under the given conditions a minimum increase in temperature established.
  • the single FIGURE illustrates the inventive method graphically.
  • the time is plotted on the horizontal axes 10 and a value for lambda in front of a catalyst on the vertical axis 12, on the vertical axis 14 an exhaust gas temperature in front of the catalyst in ° C, on the vertical axis 16 is a temperature increase by exotherm in ° K and on the vertical axis 18, a temperature in the catalyst in ° C is plotted, which may possibly be only one locally occurring in the catalyst temperature.
  • the time t 1 marks a transition from a boost phase 20 to a stoichiometric operation (rich phase) 22 with an air-fuel ratio lambda less than 1.0.
  • Line 24 marks a value for lambda equal to 1.0 and lines 26 and 28 mark a maximum allowable temperature for the catalyst.
  • the graphs 30, 32 and 34 each show the temporal progression of lambda in the case of immediate transition to the lambda value specified for substoichiometric operation, namely ⁇ 1 (graph 30), with a deviation of ⁇ 1 by a first amount to ⁇ 2 for one first predetermined or a duration defined by the signal of an oxygen-sensitive measuring device (graph 32) and deviation of ⁇ 1 by a second amount to ⁇ 3 for a second predetermined or a time defined by the signal of an oxygen-sensitive measuring device (graph 34).
  • the graphs 30a, 32a and 34a each show an exhaust gas temperature before the catalytic converter resulting from the respective chronological progression of lambda according to the graphs 30, 32, 34 after the transition.
  • the graphs 30b, 32b and 34b each show a temperature increase [° K] resulting from the respective temporal progression of lambda according to the graphs 30, 32, 34 after the transition due to chemical oxidation reactions.
  • the graphs 30c, 32c and 34c each show a temperature in the catalyst [° C] resulting from the respective temporal course of lambda according to the graphs 30, 32, 34 after the transition, which in each case arise from the superimposition of the effects according to the graphs 30a and 30b, 32a and 32b and 34a and 34b, respectively.
  • the graphs 30c, 32c, and 34c each have a maximum value T 1 , T 2, and T 3, respectively, of the catalyst temperature 18 in the period after the transition at t 1 .
  • an oxygen storage of the catalyst is filled, ie oxygen is temporarily stored in a catalyst coating or a washcoat. This oxygen is released in the fatty phase 22 and leads by corresponding, exothermic oxidation reactions of combustible components in the exhaust gas (HC, CO, H 2 ) to the temperature increase 16 according to the graphs 30b, 32b and 34b.
  • the value for the air-fuel ratio lambda in the substoichiometric phase of operation 22 for the period of emptying of the catalyst oxygen storage only one limited slightly stoichiometric value, in this case ⁇ 2 and ⁇ 3 then increase the exhaust gas temperature 14 before the catalyst and the exotherm in the catalyst by the residual oxygen content contained in the exhaust gas.
  • the maximum permissible temperature 26 can be temporarily exceeded by the exhaust gas temperature 14 (compare graphs 32a and 34a).
  • the transition to the value specified for the substoichiometric operation for lambda, namely ⁇ 1 again falls below the maximum permissible temperature.
  • the further one approaches the value of lambda to the stoichiometric value 1.0 the more leads the rising exhaust gas temperature and the residual oxygen content contained in the exhaust gas by an increasing exotherm in the catalyst due to the implementation of a portion of the combustible exhaust gas components to a higher catalyst temperature.
  • the maximum temperature in the catalytic converter which adjusts after the transition, increases again for such lambda values greater than ⁇ 2 and less than 1.0.
  • the invention it is provided to select the lambda value after the transition from lean engine operation or overrun operation to substoichiometric engine operation such that the sum of thermal and chemical energy input into the catalyst leads to a minimal temperature increase in the catalyst in the period after the transition.
  • the constant lambda value ( ⁇ 2 or ⁇ 3 ) above the lambda value ⁇ 1 specified for substoichiometric operation 22 it is also possible to use a decreasing air ratio according to a predeterminable course, in which case the entire time profile of the lambda value after the transition at t 1 a minimum maximum temperature 18 is tuned.
  • At least the same emission power in the NEDC has a noble metal content of less than 3.59 g / dm 3 (100 g / ft 3 ), in particular less than or equal to 2.87 g / dm 3 (80 g / ft 3 ), preferably less than or equal to 2.15 g / dm 3 (60 g / ft 3 ).

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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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Valve Device For Special Equipments (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (7)

  1. Procédé de fonctionnement d'un moteur à combustion interne, notamment d'un moteur à allumage par étincelles, notamment d'un véhicule automobile, comprenant au moins un catalyseur disposé dans une installation de gaz d'échappement, le moteur à combustion interne étant entraîné de manière sélective en mode stoechiométrique avec un rapport air-carburant lambda essentiellement égal à 1, en mode de fonctionnement à mélange pauvre avec un rapport air-carburant lambda supérieur à 1, en mode de poussée non alimenté ou en mode sous-stoechiométrique avec un rapport air-carburant lambda inférieur à 1,
    caractérisé en ce
    qu'après une transition du mode de fonctionnement à mélange pauvre ou du mode de poussée au mode sous-stoechiométrique, la valeur de lambda est choisie pendant un certain temps prédéterminé ou défini par le signal d'un dispositif de mesure sensible à l'oxygène de manière à s'écarter d'une valeur prédéfinie pour le mode sous-staechiométrique de telle sorte que pendant l'intervalle de temps après la transition, la somme de l'apport d'énergie thermique et chimique dans le catalyseur conduise à une augmentation de température minimale dans le catalyseur.
  2. Procédé selon la revendication 1, caractérisé en ce que l'apport d'énergie thermique comprend un apport d'énergie par une enthalpie de gaz d'échappement.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'apport d'énergie chimique comprend un apport d'énergie par réactions chimiques du fait de la libération et de la réaction de l'oxygène qui a été stocké dans une couche du catalyseur au cours d'un fonctionnement précédent.
  4. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que pendant le temps prédéterminé ou défini par le signal d'un dispositif de mesure sensible à l'oxygène, après la transition, la valeur de lambda est choisie supérieure à la valeur prédéfinie pour le mode sous-stoechiométrique et inférieure à 1.
  5. Procédé selon la revendication 4, caractérisé en ce que pendant l'intervalle de temps prédéfini ou défini par le signal d'un dispositif de mesure sensible à l'oxygène, on choisit pour lambda une valeur constante dans la plage de 0,88 à 0,98, notamment de 0,93 à 0,97.
  6. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'à la fin du temps prédéterminé ou prédéfini par le signal d'un dispositif de mesure sensible à l'oxygène, on saute de la valeur de lambda s'écartant de la valeur prédéfinie pour le mode sous-stoechiométrique à la valeur de lambda prédéfinie pour le mode sous-stoechiométrique.
  7. Procédé selon au moins l'une quelconque des revendications 1 à 5, caractérisé en ce que pendant le temps prédéterminé ou défini par le signal d'un dispositif de mesure sensible à l'oxygène, on passe de la valeur de lambda s'écartant de la valeur prédéfinie pour le mode sous-stoechiométrique à la valeur de lambda prédéfinie pour le mode sous-stoechiométrique selon une fonction constamment différenciable.
EP04102086A 2003-05-22 2004-05-13 Procédé de fonctionnement d'un moteur à combustion interne Expired - Lifetime EP1479894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10323248 2003-05-22
DE10323248A DE10323248A1 (de) 2003-05-22 2003-05-22 Verfahren zum Betreiben einer Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP1479894A1 EP1479894A1 (fr) 2004-11-24
EP1479894B1 true EP1479894B1 (fr) 2006-05-03

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EP (1) EP1479894B1 (fr)
AT (1) ATE325265T1 (fr)
DE (2) DE10323248A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021163863A1 (fr) * 2020-02-18 2021-08-26 潍柴动力股份有限公司 Procédé et dispositif de commande de moteur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115523035B (zh) * 2022-09-19 2024-01-30 东风柳州汽车有限公司 车辆控制方法、装置、设备及存储介质

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103747A1 (de) * 1991-02-07 1992-08-13 Emitec Emissionstechnologie Verfahren und vorrichtung zur steuerung eines verbrennungsmotors unter einbeziehung der aktuellen temperatur eines nachgeschalteten katalysators
DE19748971A1 (de) * 1997-11-06 1999-05-12 Opel Adam Ag System zum Schutz einer Katalysatoranordnung im Abgasstrang einer fremdgezündeten Brennkraftmaschine vor Überhitzung
JP2000045821A (ja) * 1998-07-27 2000-02-15 Mazda Motor Corp エンジンの空燃比制御方法及びその装置
DE10048392A1 (de) * 2000-09-29 2002-04-18 Emitec Emissionstechnologie Verfahren zur temperaturabhängigen Schubabschaltung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021163863A1 (fr) * 2020-02-18 2021-08-26 潍柴动力股份有限公司 Procédé et dispositif de commande de moteur

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Publication number Publication date
DE502004000497D1 (de) 2006-06-08
EP1479894A1 (fr) 2004-11-24
ATE325265T1 (de) 2006-06-15
DE10323248A1 (de) 2005-01-05

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