EP0922846B1 - Verfahren zur NOx-Reduzierung an gemischverdichtenden Brennkraftmaschinen - Google Patents
Verfahren zur NOx-Reduzierung an gemischverdichtenden Brennkraftmaschinen Download PDFInfo
- 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
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
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)
- Exhaust Gas After Treatment (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Description
Claims (4)
- Verfahren zur NOx-Reduzierung an gemischverdichtenden Brennkraftmaschinen, bei dem die Brennkraftmaschine stets mit einem Luftverhältnis von λ > 1 im Magerbetrieb gefahren wird und der λ-Wert des Brennstoff-Luft-Gemisches von einem Motorsteuergerät geregelt wird, dadurch gekennzeichnet, dass der λ-Wert in Abhängigkeit von einer mittleren Temperatur des Brennstoff-Luft-Gemisches im Brennraum der Brennkraftmaschine kontinuierlich geregelt wird, derart, dass bei kleiner mittlerer Temperatur des Brennstoff-Luft-Gemisches λ erniedrigt bzw. bei großer mittlerer Temperatur des Brennstoff-Luft-Gemisches λ erhöht wird, so dass die Brennkraftmaschine in jedem Betriebszustand in der Nähe der Aussetzergrenze betrieben werden kann.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Abgastemperatur mittels eines Temperatursensors ermittelt wird und dass die Abgastemperatur als eine Funktion der mittleren Temperatur des Brennstoff-Luft-Gemisches mittels des Motorsteuergerätes zur Steuerung des λ-Wertes benutzt wird.
- Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass die Abgastemperatur zunächst aus Betriebsparametern der Brennkraftmaschine, wie z. B. Last, Drehzahl, Kühlmitteltemperatur, Umgebungstemperatur, im Motorsteuergerät errechnet wird und dass diese Werte als Funktion der mittleren Temperatur des Brennstoff-Luft-Gemisches zur Steuerung des λ-Wertes verwendet werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass aus dem gemessenen Zylinderdruckverlauf auf rechnerischem Weg die mittlere Temperatur des Brennstoff-Luft-Gemisches zur Steuerung des λ-Wertes ermittelt wird.
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 (de) | 1999-06-16 |
EP0922846A3 EP0922846A3 (de) | 2002-05-15 |
EP0922846B1 true EP0922846B1 (de) | 2004-05-26 |
Family
ID=7851713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98120906A Expired - Lifetime EP0922846B1 (de) | 1997-12-12 | 1998-11-04 | Verfahren zur NOx-Reduzierung an gemischverdichtenden Brennkraftmaschinen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0922846B1 (de) |
AU (1) | AU9705398A (de) |
CA (1) | CA2255462A1 (de) |
DE (2) | DE19755299A1 (de) |
Families Citing this family (3)
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)
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 (de) * | 1985-01-10 | 1990-08-08 | Atlas Fahrzeugtechnik GmbH | Gemischregelungsvorrichtung für einen Verbrennungsmotor |
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 |
-
1997
- 1997-12-12 DE DE19755299A patent/DE19755299A1/de not_active Withdrawn
-
1998
- 1998-11-04 DE DE59811462T patent/DE59811462D1/de not_active Expired - Lifetime
- 1998-11-04 EP EP98120906A patent/EP0922846B1/de not_active Expired - Lifetime
- 1998-12-10 AU AU97053/98A patent/AU9705398A/en not_active Abandoned
- 1998-12-11 CA CA002255462A patent/CA2255462A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP0922846A2 (de) | 1999-06-16 |
AU9705398A (en) | 1999-07-01 |
DE59811462D1 (de) | 2004-07-01 |
DE19755299A1 (de) | 1999-06-17 |
EP0922846A3 (de) | 2002-05-15 |
CA2255462A1 (en) | 1999-06-12 |
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