EP0922846B1 - Procédé pour la réduction de la teneur en NOx des gaz d'échappement d'un moteur à combustion interne. - Google Patents

Procédé pour la réduction de la teneur en NOx des gaz d'échappement d'un moteur à combustion interne. Download PDF

Info

Publication number
EP0922846B1
EP0922846B1 EP98120906A EP98120906A EP0922846B1 EP 0922846 B1 EP0922846 B1 EP 0922846B1 EP 98120906 A EP98120906 A EP 98120906A EP 98120906 A EP98120906 A EP 98120906A EP 0922846 B1 EP0922846 B1 EP 0922846B1
Authority
EP
European Patent Office
Prior art keywords
temperature
internal combustion
fuel
air mixture
value
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
EP98120906A
Other languages
German (de)
English (en)
Other versions
EP0922846A3 (fr
EP0922846A2 (fr
Inventor
Ralf Dipl.-Ing. Steinert
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.)
MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge 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 MAN Nutzfahrzeuge AG filed Critical MAN Nutzfahrzeuge AG
Publication of EP0922846A2 publication Critical patent/EP0922846A2/fr
Publication of EP0922846A3 publication Critical patent/EP0922846A3/fr
Application granted granted Critical
Publication of EP0922846B1 publication Critical patent/EP0922846B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/14—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
    • 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
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015—Engines misfires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/36—Control for minimising NOx emissions
    • 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

Definitions

  • the invention relates to an internal combustion engine according to the generic term of claim 1.
  • the invention is based on the object for controlling the ⁇ -value of the internal combustion engine such that x -reduction to NO can be herwall up to the misfire limit.
  • the mixture can be leaned or enriched to the extent that the misfire limit is reached, but not exceeded, in any operating state of the internal combustion engine.
  • the NO x reduction is thus brought up to the physically possible limit.
  • the exhaust gas temperature is a function of the mass average temperature, so that this can be used as a substitute size.
  • the exhaust gas temperature is easily detectable with a temperature sensor and can be in the engine control unit can be used to control the ⁇ value.
  • Claim 3 Another advantageous method for determining the mass average temperature can Claim 3 can be taken.
  • the exhaust gas temperature is converted from relevant engine parameters determined as a substitute quantity depending on the mean mass temperature and this is used as a control signal for the ⁇ value.
  • the mass mean temperature is based on claim 4 out.
  • the cylinder pressure curve can be measured with a pressure measuring probe are calculated from this and the mass average temperature and for the control of Lambda can be used.
  • the method according to the invention for operating a mixture-compressing internal combustion engine in lean operation with ⁇ , always greater than 1 is that one recognizes has that the critical limit for ⁇ in dynamic operation is not a fixed limit, but a sliding limit that depends on the average mass temperature in the combustion chamber.
  • the method according to the invention begins, which consists in that ⁇ is used as a function of the average mass temperature of the compressed fuel-air mixture treated in the combustion chamber. Because this mass mean temperature cannot be determined directly is, according to the invention, the procedure is such that this variable can be measured determined, for example, that the exhaust gas temperature with a temperature sensor determined and with an engine control unit the mass average temperature as one Function of the exhaust gas temperature is calculated and the calculation result of the control of the maximum possible ⁇ value or the exhaust gas temperature as a substitute quantity used for the mean mass temperature for ⁇ adjustment.
  • the method according to the invention can also be used in dynamic driving with ⁇ go to the dropout limit without exceeding it.
  • ⁇ go to the dropout limit without exceeding it.

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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (4)

  1. Procédé de réduction des émissions d'oxyde d'azote NOx de moteurs à combustion interne fonctionnant avec compression de mélange, selon lequel on fait fonctionner le moteur à combustion interne en permanence avec un coefficient d'air λ> 1 en mode maigre et ce coefficient λ du mélange combustible/air est régulé par l'appareil de commande du moteur,
    caractérisé en ce que
    le coefficient λ est régulé en continu en fonction d'une température moyenne du mélange carburant-air dans la chambre de combustion du moteur à combustion interne, de sorte que pour une température moyenne plus petite du mélange carburant-air, on diminue le coefficient λ, et pour une température moyenne du mélange carburant-air on augmente le coefficient λ de façon que le moteur à combustion interne fonctionne dans chaque mode de fonctionnement à proximité de la limite de calage.
  2. Procédé selon la revendication 1.
    caractérisé en ce qu'
    on détermine la température des gaz d'échappement par un capteur de température et l'appareil de commande du moteur pour commander le coefficient λ utilise la température des gaz d'échappement comme fonction de la température moyenne du mélange carburant-air.
  3. Procédé selon les revendications 1 et 2,
    caractérisé en ce qu'
    on calcule tout d'abord la température des gaz d'échappement à partir des paramètres de fonctionnement du moteur à combustion interne tels que la charge, le régime, la température du liquide de refroidissement, la température ambiante dans l'appareil de commande du moteur et
    on utilise ces valeurs comme fonctions de la température moyenne du mélange carburant-air pour commander le coefficient λ.
  4. Procédé selon la revendication 1,
    caractérisé en ce qu'
    à partir de la courbe mesurée de la pression des cylindres on détermine par le calcul la température moyenne du mélange carburant-air pour commander le coefficient λ.
EP98120906A 1997-12-12 1998-11-04 Procédé pour la réduction de la teneur en NOx des gaz d'échappement d'un moteur à combustion interne. Expired - Lifetime EP0922846B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19755299 1997-12-12
DE19755299A DE19755299A1 (de) 1997-12-12 1997-12-12 Verfahren zur NO¶x¶-Reduzierung an gemischverdichtenden Brennkraftmaschinen

Publications (3)

Publication Number Publication Date
EP0922846A2 EP0922846A2 (fr) 1999-06-16
EP0922846A3 EP0922846A3 (fr) 2002-05-15
EP0922846B1 true EP0922846B1 (fr) 2004-05-26

Family

ID=7851713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98120906A Expired - Lifetime EP0922846B1 (fr) 1997-12-12 1998-11-04 Procédé pour la réduction de la teneur en NOx des gaz d'échappement d'un moteur à combustion interne.

Country Status (4)

Country Link
EP (1) EP0922846B1 (fr)
AU (1) AU9705398A (fr)
CA (1) CA2255462A1 (fr)
DE (2) DE19755299A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19852240A1 (de) 1998-11-12 2000-05-18 Volkswagen Ag Überwachungsverfahren für NOx-Speicherkatalysatoren und Abgasreinigungsvorrichtung zur Durchführung dieses Verfahrens
DE10307367A1 (de) * 2003-02-21 2004-09-09 B + V Industrietechnik Gmbh Verfahren und Vorrichtung zur Regelung von gasbetriebenen Motoren
FI124007B (fi) * 2008-12-16 2014-01-31 Waertsilae Finland Oy Menetelmä ja järjestelmä polttomoottorin päästöjen hallitsemiseksi

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3204842A1 (de) * 1982-02-11 1983-08-18 Volkswagenwerk Ag, 3180 Wolfsburg Einrichtung zur regelung einer otto-brennkraftmaschine
DE3410930A1 (de) * 1984-03-24 1985-10-03 Motoren-Werke Mannheim AG vorm. Benz Abt. stationärer Motorenbau, 6800 Mannheim Einrichtung zur regelung des verbrennungsluftverhaeltnisses bei otto-gas-motoren mit abgas-katalysatoren
DE3500594C2 (de) * 1985-01-10 1995-08-17 Bosch Gmbh Robert Zumeßsystem für eine Brennkraftmaschine zur Beeinflussung des Betriebsgemisches
EP0187649B1 (fr) * 1985-01-10 1990-08-08 Atlas Fahrzeugtechnik GmbH Appareil de régulation de mélange pour moteur à combustion
JPS6388241A (ja) * 1986-09-30 1988-04-19 Mitsubishi Electric Corp 内燃機関の空燃比制御装置
US4887574A (en) * 1987-04-21 1989-12-19 Hitachi, Ltd. Control apparatus for internal combustion engines
JPH03225045A (ja) * 1990-01-31 1991-10-04 Toyota Motor Corp 内燃機関の空燃比制御装置
DE4033026C2 (de) * 1990-10-18 1997-09-04 Bayerische Motoren Werke Ag Verfahren zur Vermeidung thermisch kritischer Zustände einer Abgasnachbehandlungsvorrichtung für eine Brennkraftmaschine
JPH04234542A (ja) * 1990-12-28 1992-08-24 Honda Motor Co Ltd 内燃エンジンの空燃比制御方法
DE4420946B4 (de) * 1994-06-16 2007-09-20 Robert Bosch Gmbh Steuersystem für die Kraftstoffzumessung bei einer Brennkraftmaschine

Also Published As

Publication number Publication date
DE19755299A1 (de) 1999-06-17
AU9705398A (en) 1999-07-01
EP0922846A3 (fr) 2002-05-15
EP0922846A2 (fr) 1999-06-16
CA2255462A1 (fr) 1999-06-12
DE59811462D1 (de) 2004-07-01

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