DE19755299A1 - Process for NO¶x¶ reduction in mixture-compressing internal combustion engines - Google Patents

Process for NO¶x¶ reduction in mixture-compressing internal combustion engines

Info

Publication number
DE19755299A1
DE19755299A1 DE19755299A DE19755299A DE19755299A1 DE 19755299 A1 DE19755299 A1 DE 19755299A1 DE 19755299 A DE19755299 A DE 19755299A DE 19755299 A DE19755299 A DE 19755299A DE 19755299 A1 DE19755299 A1 DE 19755299A1
Authority
DE
Germany
Prior art keywords
temperature
internal combustion
mean
value
combustion engine
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.)
Withdrawn
Application number
DE19755299A
Other languages
German (de)
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
Priority to DE19755299A priority Critical patent/DE19755299A1/en
Priority to DE59811462T priority patent/DE59811462D1/en
Priority to EP98120906A priority patent/EP0922846B1/en
Priority to AU97053/98A priority patent/AU9705398A/en
Priority to CA002255462A priority patent/CA2255462A1/en
Publication of DE19755299A1 publication Critical patent/DE19755299A1/en
Priority to US10/441,777 priority patent/US6931836B2/en
Withdrawn legal-status Critical Current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

Description

Die Erfindung bezieht sich auf eine Brennkraftmaschine gemäß dem Gattungsbegriff des Patentanspruches 1.The invention relates to an internal combustion engine according to the generic term of claim 1.

Zur Reduzierung der NOx-Werte bei gemischverdichtenden Brennkraftmaschinen ist es bekannt, mit einem Brennstoff-Luftgemisch mit λ < 1 im Magerbetrieb zu fahren. Aufgrund der im stationären Betrieb hohen Massenmitteltemperaturen im Brennraum einer Brennkraftmaschine müssen im Hinblick auf eine niedrige NOx-Emission hohe Lambda-Werte eingestellt werden.To reduce the NO x values in mixture-compressing internal combustion engines, it is known to run with a fuel-air mixture with λ <1 in lean operation. Due to the high mass mean temperatures in the combustion chamber of an internal combustion engine during steady-state operation, high lambda values must be set with a view to low NO x emissions.

Schwierigkeiten ergeben sich beim instationären Betrieb, z. B. Beschleunigungsvor­ gänge aus einer niedrigen Motordrehzahl, wenn die Massenmitteltemperatur im Brenn­ raum gegenüber dem stationären Betrieb geringer ist und dadurch sich die Aussetzer­ grenze nach niedrigeren Lambda-Werten verschiebt.Difficulties arise in transient operation, e.g. B. Accelerator gears from a low engine speed when the mass average temperature in the combustion space compared to stationary operation is smaller and therefore the dropouts limit moved to lower lambda values.

Der Erfindung liegt die Aufgabe zugrunde, den λ-Wert der Brennkraftmaschine derart zu steuern, daß zur NOx-Reduzierung bis an die Aussetzergrenze hergegangen werden kann.The invention is based on the object for controlling the λ-value of the internal combustion engine such that x -reduction to NO can be hergegangen up to the misfire limit.

Erfindungsgemäß wird diese Aufgabe durch die kennzeichnenden Merkmale des Pa­ tentanspruches 1 gelöst.According to the invention this task is characterized by the characteristic features of the Pa claim 1 solved.

Dadurch, daß die Steuerung der λ-Werte durch die Massenmitteltemperatur erfolgt, kann man in jedem Betriebszustand der Brennkraftmaschine das Gemisch soweit ab­ magern bzw. anfetten, daß man an die Aussetzergrenze herankommt, diese aber nicht überschreitet. Die NOx-Reduzierung wird somit bis an die physikalisch mögliche Grenze herangeführt.The fact that the λ values are controlled by the mean mass temperature means that the mixture can be leaned or enriched to the extent that the misfire limit can be 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.

Eine vorteilhafte Möglichkeit zur Ermittlung der Massenmitteltemperatur kann An­ spruch 2 entnommen werden. Die Abgastemperatur ist eine Funktion der Massen­ mitteltemperatur, so daß diese als Ersatzgröße herangezogen werden kann. Die Abgas­ temperatur ist leicht mit einem Temperatursensor erfaßbar und kann im Motor­ steuergerät zur Steuerung des λ-Wertes verwendet werden.An advantageous possibility for determining the mean mass temperature can be An saying 2 are taken. The exhaust gas temperature is a function of the masses medium temperature, so that this can be used as a substitute size. The exhaust temperature is easily detectable with a temperature sensor and can be in the engine control device can be used to control the λ value.

Eine weitere vorteilhafte Methode zur Ermittlung der Massenmitteltemperatur kann Anspruch 3 entnommen werden. Aus relevanten Motorparametern wird die Abgastem­ peratur in Abhängigkeit der Massenmitteltemperatur als Ersatzgröße ermittelt und diese als Steuerungssignal für den λ-Wert herangezogen.Another advantageous method for determining the mean mass temperature can Claim 3 can be taken. The relevant engine parameters become the exhaust gas temperature determined as a substitute variable depending on the mean mass temperature and this is used as a control signal for the λ value.

Eine andere Möglichkeit zur Ermittlung der Massenmitteltemperatur geht aus An­ spruch 4 hervor. Mit einer Druckmeßsonde kann der Zylinderdruckverlauf gemessen werden und daraus die Massenmitteltemperatur errechnet und für die Steuerung von Lambda verwendet werden.Another possibility for determining the mass average temperature is from An saying 4. 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.

Das erfindungsgemäße Verfahren zum Betrieb einer gemischverdichtenden Brenn­ kraftmaschine im Magerbetrieb mit λ stets größer als 1 besteht darin, daß man erkannt hat, daß die kritische Grenze für λ im dynamischen Betrieb keine feste Grenze ist, sondern eine gleitende Grenze, die von der Massenmitteltemperatur im Brennraum ab­ hängt.The method according to the invention for operating a mixture-compressing combustion Engine in lean operation with λ always greater than 1 is that one recognizes has that the critical limit for λ in dynamic operation is not a fixed limit, but a sliding limit that depends on the mass average temperature in the combustion chamber hangs.

Das Problem besteht nun darin, daß die Temperatursensoren nach dem derzeitigen Stand der Technik zu träge sind, um diese Massenmitteltemperatur unmittelbar zur gleitenden Steuerung des nach physikalischen Gesetzen maximal möglichen Wertes von λ heranzuziehen. Nach dem Stand der Technik ist man genötigt im dynamischen Fahrbetrieb λ zu senken, um Zündaussetzer zu vermeiden. Durch die Senkung von λ nimmt man allerdings steigende NOx Konzentrationen im Abgas in Kauf.The problem now is that the temperature sensors according to the current state of the art are too slow to use this mean mass temperature directly for the sliding control of the maximum possible value of λ according to physical laws. According to the prior art, it is necessary to reduce λ in dynamic driving to avoid misfiring. By lowering λ, however, increasing NO x concentrations in the exhaust gas are accepted.

Hier setzt nun das erfindungsgemäße Verfahren ein, das darin besteht, daß man λ als eine Funktion der Massenmitteltemperatur des verdichteten Brennstoff-Luftgemisches im Brennraum behandelt. Da diese Massenmitteltemperatur nicht direkt zu ermitteln ist, wird erfindungsgemäß so verfahren, daß man diese Größe aus meßbaren Parame­ tern ermittelt, beispielsweise, daß man die Abgastemperatur mit einem Temperatursen­ sor ermittelt und mit einem Motorsteuergerät die Massenmitteltemperatur als eine Funktion der Abgastemperatur errechnet und das Rechenergebnis der Steuerung des maximal möglichen λ-Wertes zugrunde liegt oder die Abgastemperatur als Ersatz­ größe für die Massenmitteltemperatur zur λ-Anpassung verwendet.This is where the method according to the invention begins, which consists in that λ 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 parameter can be measured tern determined, for example, that the exhaust gas temperature with a Temperatursen sor 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 λ value or the exhaust gas temperature as a substitute Size used for the mean mass temperature for λ adjustment.

Eine weitere Möglichkeit besteht darin, daß man die Abgastemperatur nicht direkt bestimmt, sondern diese aus Last, Drehzahl, Kühlmitteltemperatur und Umgebungs­ temperatur im Motorsteuergerät errechnet und als Funktion dieses Rechenergebnisses wiederum auf die Massenmitteltemperatur im Brennraum schließt und damit den λ-Wert regelt.Another possibility is that the exhaust gas temperature is not directly determined, but this from load, speed, coolant temperature and ambient temperature calculated in the engine control unit and as a function of this calculation result again concludes the mass average temperature in the combustion chamber and thus the λ value regulates.

Eine weitere Möglichkeit der gleitenden Steuerung des Lambda-Wertes ergibt sich durch die Messung des Zylinderdruckverlaufes mittels eines Drucksensors. Mit Hilfe der Brennverlaufsanalyse kann die Massenmitteltemperatur errechnet werden und damit der Lambda-Wert angepaßt werden.Another possibility for smooth control of the lambda value arises by measuring the cylinder pressure curve using a pressure sensor. With help the mean temperature of the fire can be calculated and so that the lambda value can be adjusted.

Mit dem erfindungsgemäßen Verfahren kann man auch im dynamischen Fahrbetrieb mit λ bis an die Aussetzergrenze gehen, ohne diese jedoch zu überschreiten. Durch die maximale Ausschöpfung des theoretisch möglichen Spektrums für den Wert λ ist eine Minimierung der Schadstoffanteile, insbesondere von NOx gewährleistet.With the method according to the invention, one can also go to the misfire limit with λ in dynamic driving operation, but without exceeding it. The maximum utilization of the theoretically possible spectrum for the value λ ensures that the pollutant fractions, in particular NO x , are minimized.

Claims (4)

1. Verfahren zur NOx-Reduzierung an gemischverdichtenden Brennkraft­ maschinen, bei dem die Brennkraftmaschine stets mit einem Luftverhältnis von λ < 1 im Magerbetrieb gefahren wird und der λ-Wert des Brennstoff- Luftgemisches von einem Motorsteuergerät geregelt wird, dadurch gekenn­ zeichnet, daß der λ-Wert in Abhängigkeit von einer Massenmitteltemperatur im Brennraum der Brennkraftmaschine gleitend geregelt wird, derart, daß bei kleiner Massenmitteltemperatur λ erniedrigt, bzw. bei großer Massenmittel­ temperatur λ erhöht wird, so daß die Brennkraftmaschine in jedem Betriebs­ zustand in der Nähe der Aussetzergrenze betrieben werden kann.1. Process for NO x reduction in mixture-compressing internal combustion engines, in which the internal combustion engine is always operated with an air ratio of λ <1 in lean operation and the λ value of the fuel-air mixture is regulated by an engine control unit, characterized in that λ value depending on a mean mass temperature in the combustion chamber of the internal combustion engine is regulated in such a way that at a low mean mean temperature λ is lowered, or at a large mean mean temperature λ is increased, so that the internal combustion engine is operated in any operating condition in the vicinity of the misfire limit can. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Abgas­ temperatur mittels eines Temperatursensors ermittelt wird, und daß die Abgastemperatur als eine Funktion der Massenmitteltemperatur mittels des Motorsteuergerätes zur Steuerung des λ-Wertes benutzt wird.2. The method according to claim 1, characterized in that the exhaust gas temperature is determined by means of a temperature sensor, and that the exhaust gas temperature as a function of the mean mass temperature of the engine control unit is used to control the λ value. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Ab­ gastemperatur zunächst aus Betriebsparametern der Brennkraftmaschine wie z. B. Last, Drehzahl, Kühlmitteltemperatur, Umgebungstemperatur im Motor­ steuergerät errechnet wird und daß diese Werte als Funktion der Massenmit­ teltemperatur zur Steuerung des λ-Wertes verwendet werden.3. The method according to claims 1 and 2, characterized in that the Ab gas temperature initially from operating parameters of the internal combustion engine such as e.g. B. load, speed, coolant temperature, ambient temperature in the engine control unit is calculated and that these values as a function of mass temperature can be used to control the λ value. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß aus dem gemessenen Zylinderdruckverlauf auf rechnerischem Weg die Massenmitteltemperatur zur Steuerung des λ-Wertes ermittelt wird.4. The method according to claim 1, characterized in that from the measured The cylinder pressure curve calculates the mean mass temperature Control of the λ value is determined.
DE19755299A 1997-12-12 1997-12-12 Process for NO¶x¶ reduction in mixture-compressing internal combustion engines Withdrawn DE19755299A1 (en)

Priority Applications (6)

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
DE59811462T DE59811462D1 (en) 1997-12-12 1998-11-04 Process for NOx reduction on mixture-compressing internal combustion engines
EP98120906A 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
AU97053/98A AU9705398A (en) 1997-12-12 1998-12-10 Method of reducing NOx in compressed mixture combustion engines
CA002255462A CA2255462A1 (en) 1997-12-12 1998-12-11 Method for nox reduction of internal combustion
US10/441,777 US6931836B2 (en) 1997-12-12 2003-05-19 Method for NOx reduction of externally-ignited, explosion, internal combustion engines

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
DE19755299A1 true DE19755299A1 (en) 1999-06-17

Family

ID=7851713

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19755299A Withdrawn DE19755299A1 (en) 1997-12-12 1997-12-12 Process for NO¶x¶ reduction in mixture-compressing internal combustion engines
DE59811462T Expired - Lifetime DE59811462D1 (en) 1997-12-12 1998-11-04 Process for NOx reduction on mixture-compressing internal combustion engines

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE59811462T Expired - Lifetime DE59811462D1 (en) 1997-12-12 1998-11-04 Process for NOx reduction on mixture-compressing internal combustion engines

Country Status (4)

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

Cited By (2)

* 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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI124007B (en) * 2008-12-16 2014-01-31 Waertsilae Finland Oy Method and system for controlling combustion engine emissions

Citations (7)

* 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
DE3733052A1 (en) * 1986-09-30 1988-04-07 Mitsubishi Electric Corp Control system for the fuel-air mixture ratio in internal combustion engines
EP0187649B1 (en) * 1985-01-10 1990-08-08 Atlas Fahrzeugtechnik GmbH Mixture regulation apparatus for a combustion engine
DE4142328A1 (en) * 1990-12-28 1992-07-02 Honda Motor Co Ltd METHOD FOR REGULATING THE AIR FUEL RATIO FOR AN INTERNAL COMBUSTION ENGINE
DE3500594C2 (en) * 1985-01-10 1995-08-17 Bosch Gmbh Robert Metering system for an internal combustion engine to influence the operating mixture
DE4420946A1 (en) * 1994-06-16 1995-12-21 Bosch Gmbh Robert Control system for metering fuel in 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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4887574A (en) * 1987-04-21 1989-12-19 Hitachi, Ltd. Control apparatus for internal combustion engines
JPH03225045A (en) * 1990-01-31 1991-10-04 Toyota Motor Corp Air-fuel ratio control device for internal combustion engine

Patent Citations (7)

* 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
EP0187649B1 (en) * 1985-01-10 1990-08-08 Atlas Fahrzeugtechnik GmbH Mixture regulation apparatus for a combustion engine
DE3500594C2 (en) * 1985-01-10 1995-08-17 Bosch Gmbh Robert Metering system for an internal combustion engine to influence the operating mixture
DE3733052A1 (en) * 1986-09-30 1988-04-07 Mitsubishi Electric Corp Control system for the fuel-air mixture ratio in internal combustion engines
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
DE4142328A1 (en) * 1990-12-28 1992-07-02 Honda Motor Co Ltd METHOD FOR REGULATING THE AIR FUEL RATIO FOR AN INTERNAL COMBUSTION ENGINE
DE4420946A1 (en) * 1994-06-16 1995-12-21 Bosch Gmbh Robert Control system for metering fuel in an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ROTERT,Andreas: Steuerung der Abgasrückführung. In: MTZ Motortechnische Zeitschrift 58, 1997, 5, S.294-299 *

Cited By (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
US6499291B2 (en) 1998-11-12 2002-12-31 Volkswagen Ag Apparatus and method for monitoring NOx storage catalytic converters
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

Also Published As

Publication number Publication date
DE59811462D1 (en) 2004-07-01
EP0922846A2 (en) 1999-06-16
EP0922846A3 (en) 2002-05-15
EP0922846B1 (en) 2004-05-26
AU9705398A (en) 1999-07-01
CA2255462A1 (en) 1999-06-12

Similar Documents

Publication Publication Date Title
DE10356133B4 (en) Method for determining the start of combustion of internal combustion engines
WO1999015872A2 (en) Method for evaluating the march of pressure in a combustion chamber
DE102008004221A1 (en) Determining an occurring during the operation of an internal combustion engine NOx and soot emission
DE19814732B4 (en) Speed detection method, in particular for misfire detection
DE102006000973A1 (en) Residual gas determining method for use in internal combustion engine of vehicle, involves determining residual gas content based on parameter that characterizes combustion process in chamber
DE19612179C1 (en) Combustion control of multi-cylinder engine
WO2014079648A1 (en) Method and device for detecting autoignitions on the basis of measured and estimated internal cylinder pressure values of an internal combustion engine
DE102005021528B3 (en) Process and device to estimate the ratio between the volume of fuel burnt in combustion engine and the fuel put in cylinder uses signals from sensors in cylinder and crank shaft to calculate cylinder pressures used for estimation
DE102009045792A1 (en) Method for controlling air ratio lambda of internal combustion engine, involves determining adjustment value to map deviation of air ratios, where adjustment value is used for compensating deviation after new operation of engine
DE10004330A1 (en) Programmable control and regulating electronics for an internal combustion engine
EP1998032B1 (en) Method for evaluating the status of an air/fuel mixture
DE19755299A1 (en) Process for NO¶x¶ reduction in mixture-compressing internal combustion engines
DE112015001142B4 (en) Air-fuel ratio detection device for an internal combustion engine
DE102009023964B4 (en) Method for operating a two-stroke engine
DE102014226757B3 (en) Method and device for detecting pre-ignition in a spark-ignited internal combustion engine
DE102011087199A1 (en) Method for operating an internal combustion engine
DE102012012341A1 (en) Method for operating unit of petrol engine of motor car, involves calculating computed torque function as combustion parameter in combustion chamber by using computing device based upon program stored in computing device model
DE102010004091A1 (en) Method for operating internal combustion engine, involves detecting operational parameter by internal combustion engine sensor and influencing operational parameter by actuator
EP0868660A2 (en) Process for detecting cyclical fluctuations in combustion in an internal combustion engine
DE102020123353B4 (en) Method and device for optimizing the exhaust aftertreatment of an internal combustion engine
DE102011012100B4 (en) Method for operating an internal combustion engine
DE10008552A1 (en) Method and device for evaluating a signal of an ion current sensor of an internal combustion engine
DE10214833A1 (en) Method for determining an indicated actual engine torque for an internal combustion engine, using Fourier analysis to calculate appropriate Fourier coefficients from a signal for crankshaft speed
WO2016083232A1 (en) Method for detecting a voltage offset at least in a portion of a voltage lambda characteristic curve
DE102007013460A1 (en) Method for testing an air mass sensor for an internal combustion engine comprises determining a cylinder pressure to determine a combustion center of gravity position and/or an induced average pressure and further processing

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8110 Request for examination paragraph 44
8130 Withdrawal