EP0922846A3 - Process for the reduction of the content of NOx in the exhaust gas of an internal combustion engine - Google Patents

Process for the reduction of the content of NOx in the exhaust gas of an internal combustion engine Download PDF

Info

Publication number
EP0922846A3
EP0922846A3 EP98120906A EP98120906A EP0922846A3 EP 0922846 A3 EP0922846 A3 EP 0922846A3 EP 98120906 A EP98120906 A EP 98120906A EP 98120906 A EP98120906 A EP 98120906A EP 0922846 A3 EP0922846 A3 EP 0922846A3
Authority
EP
European Patent Office
Prior art keywords
temperature
reduction
internal combustion
content
exhaust gas
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
EP98120906A
Other languages
German (de)
French (fr)
Other versions
EP0922846B1 (en
EP0922846A2 (en
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/en
Publication of EP0922846A3 publication Critical patent/EP0922846A3/en
Application granted granted Critical
Publication of EP0922846B1 publication Critical patent/EP0922846B1/en
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
    • F02D41/1473—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Die Erfindung bezieht sich auf ein Verfahren zur NOx-Reduzierung an gemischverdichtenden Brennkraftmaschinen, welche im Magerbetrieb, also mit λ > 1 gefahren werden. Besonders Gasmotoren werden zur NOx-Reduzierung mit hohem Luftüberschuß gefahren. Erfindungsgemäß wird dieser Luftüberschuß im instationären Betrieb so geregelt, daß man mit dem λ- Wert bis an die Aussetzergrenze geht. Da diese Aussetzergrenze eine Funktion der Massenmitteltemperatur ist, wird diese für die Regelung des λ- Wertes verwendet. Bei hoher Massenmitteltemperatur wird λ erhöht und bei niedriger Massenmitteltemperatur wird λ gesenkt, so daß man sich mit λ immer an der höchst zulässigen Grenze bewegt. Die Massenmitteltemperatur kann erfindungsgemäß über die Abgastemperatur oder rechnerisch aus dem Zylinderdruckverlauf bestimmt werden. Durch die hohen λ- Werte wird der NOx-Gehalt der Abgase spürbar erniedrigt.The invention relates to a method for NO x reduction in mixture-compressing internal combustion engines which are operated in lean operation, that is to say with λ> 1. Gas engines in particular are operated with a large excess of air to reduce NOx. According to the invention, this excess air is regulated in non-steady-state operation in such a way that the λ value reaches the misfire limit. Since this misfire limit is a function of the mean mass temperature, it is used to control the λ value. At a high mean mass temperature, λ is increased and at a low mean mass temperature, λ is lowered, so that λ always moves at the highest permissible limit. The mass average temperature can be determined according to the invention via the exhaust gas temperature or arithmetically from the cylinder pressure curve. The high λ values noticeably lower the NO x content of the exhaust gases.

EP98120906A 1997-12-12 1998-11-04 Process for the reduction of the content of NOx in the exhaust gas of an internal combustion engine Expired - Lifetime EP0922846B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19755299A DE19755299A1 (en) 1997-12-12 1997-12-12 Process for NO¶x¶ reduction in mixture-compressing internal combustion engines
DE19755299 1997-12-12

Publications (3)

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

Family

ID=7851713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98120906A Expired - Lifetime EP0922846B1 (en) 1997-12-12 1998-11-04 Process for the reduction of the content of NOx in the exhaust gas of an internal combustion engine

Country Status (4)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19852240A1 (en) 1998-11-12 2000-05-18 Volkswagen Ag Monitoring method for NOx storage catalytic converters and exhaust gas purification device for carrying out this method
DE10307367A1 (en) * 2003-02-21 2004-09-09 B + V Industrietechnik Gmbh Regulating gas-powered engines involves measuring combustion pressure in each cylinder, controlling fuel feed depending on pressure evaluation carried out immediately after pressure value measurement
FI124007B (en) * 2008-12-16 2014-01-31 Waertsilae Finland Oy Method and system for controlling combustion engine emissions

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3204842A1 (en) * 1982-02-11 1983-08-18 Volkswagenwerk Ag, 3180 Wolfsburg Device for controlling a spark-ignition internal-combustion engine
DE3410930A1 (en) * 1984-03-24 1985-10-03 Motoren-Werke Mannheim AG vorm. Benz Abt. stationärer Motorenbau, 6800 Mannheim Device for controlling the combustion air ratio in Otto gas engines with exhaust gas catalysts
DE3733052A1 (en) * 1986-09-30 1988-04-07 Mitsubishi Electric Corp Control system for the fuel-air mixture ratio in internal combustion engines
EP0288056A2 (en) * 1987-04-21 1988-10-26 Hitachi, Ltd. Control apparatus for internal combustion engines
EP0440211A2 (en) * 1990-01-31 1991-08-07 Toyota Jidosha Kabushiki Kaisha An air-fuel ratio control device for a vehicle engine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3500594C2 (en) * 1985-01-10 1995-08-17 Bosch Gmbh Robert Metering system for an internal combustion engine to influence the operating mixture
DE3673175D1 (en) * 1985-01-10 1990-09-13 Atlas Fahrzeugtechnik Gmbh MIXTURE CONTROL DEVICE FOR AN INTERNAL COMBUSTION ENGINE.
DE4033026C2 (en) * 1990-10-18 1997-09-04 Bayerische Motoren Werke Ag Method for avoiding thermally critical states of an exhaust gas aftertreatment device for an internal combustion engine
JPH04234542A (en) * 1990-12-28 1992-08-24 Honda Motor Co Ltd Air-fuel ratio control method for internal combustion engine
DE4420946B4 (en) * 1994-06-16 2007-09-20 Robert Bosch Gmbh Control system for fuel metering in an internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3204842A1 (en) * 1982-02-11 1983-08-18 Volkswagenwerk Ag, 3180 Wolfsburg Device for controlling a spark-ignition internal-combustion engine
DE3410930A1 (en) * 1984-03-24 1985-10-03 Motoren-Werke Mannheim AG vorm. Benz Abt. stationärer Motorenbau, 6800 Mannheim Device for controlling the combustion air ratio in Otto gas engines with exhaust gas catalysts
DE3733052A1 (en) * 1986-09-30 1988-04-07 Mitsubishi Electric Corp Control system for the fuel-air mixture ratio in internal combustion engines
EP0288056A2 (en) * 1987-04-21 1988-10-26 Hitachi, Ltd. Control apparatus for internal combustion engines
EP0440211A2 (en) * 1990-01-31 1991-08-07 Toyota Jidosha Kabushiki Kaisha An air-fuel ratio control device for a vehicle engine

Also Published As

Publication number Publication date
EP0922846B1 (en) 2004-05-26
CA2255462A1 (en) 1999-06-12
AU9705398A (en) 1999-07-01
DE19755299A1 (en) 1999-06-17
EP0922846A2 (en) 1999-06-16
DE59811462D1 (en) 2004-07-01

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