EP2004972A1 - Method of reducing soot emissions in internal combustion engines - Google Patents

Method of reducing soot emissions in internal combustion engines

Info

Publication number
EP2004972A1
EP2004972A1 EP07703856A EP07703856A EP2004972A1 EP 2004972 A1 EP2004972 A1 EP 2004972A1 EP 07703856 A EP07703856 A EP 07703856A EP 07703856 A EP07703856 A EP 07703856A EP 2004972 A1 EP2004972 A1 EP 2004972A1
Authority
EP
European Patent Office
Prior art keywords
humidity
intake air
calculated
intake
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.)
Withdrawn
Application number
EP07703856A
Other languages
German (de)
French (fr)
Inventor
Hong Zhang
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.)
Continental Automotive GmbH
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP2004972A1 publication Critical patent/EP2004972A1/en
Withdrawn legal-status Critical Current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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • 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
    • F02D41/1466—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 a soot concentration or content
    • F02D41/1467—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 a soot concentration or content with determination means using an estimation
    • 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
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0418—Air humidity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for reducing soot emission in internal combustion engines.
  • DE 19750496 A1 discloses a method for determining the air taken in by an internal combustion engine and a sensor for an internal combustion engine.
  • the method shown there further forms conventional methods in which the air mass drawn in by an internal combustion engine is written by means of an air mass meter.
  • Combustion process relevant data such as the temperature or the intake manifold pressure for calculating injection times and the like processed.
  • a disadvantage of this method is that when determining the air mass size changing large, which affect the air mass, are not included.
  • a mass that changes the air mass is for example the humidity.
  • the air mass flow detected by the air mass meter is falsified due to the humidity in that, in addition to the combustible air in the internal combustion engine, water vapor is simultaneously detected which can not be burned and therefore leads to very disadvantageous changes in the emission values.
  • a device for determining the state of a Abgasruckchtungssystems for accurately determining the state of a Abgasruckchtungssystems comprising a Abgasruckschreibungs trimlass is provided.
  • the apparatus for determining the condition includes a humidity sensor disposed in the exhaust gas discharge passage for detecting a humidity within the exhaust gas discharge passage. With the device, the moisture content of the returned exhaust gas is determined, wherein based on the determined moisture, the state of the Abgasruckchtungssystems comprising the
  • EGR rate is not applied so high to reduce nitrogen oxides so that soot emission does not increase dramatically as the intake air humidity in the field increases.
  • it is necessary to reduce this reserve, which has hitherto been sufficient.
  • the object of the invention is to comply with the soot emission level of a vehicle regardless of the environmental conditions in the field in order not to exceed the limit in systems without particulate filter.
  • Another task is the
  • Ambient temperature can be determined and taken into account in the regulation of Abgasruckbowung.
  • the information about the humidity can come from a sensor (for example in the air conditioning system, the instrument cluster or the navigation system or other sensors). From the calculated or calculated moisture content and the intake air temperature, the proportion of water in the
  • the base exhaust gas recirculation rate is corrected so that, while maintaining the nitrogen oxide emission value, the particulate emission does not increase with changes in humidity.
  • an exhaust gas recirculation rate is output and applied.
  • the exhaust gas recirculation rate is reduced based on calculation models stored in characteristics. If the water content is reduced by moisture relative to the reference value, the Abgasruckuhrungsrate is increased by a characteristic model.
  • the value of lambda is used to adapt the measured air mass and / or the exhaust gas flow and / or fuel mass.
  • the water content is taken into account via the information relating to the humidity and the intake air temperature.
  • the measured lambda value lam is compared in real terms with the calculated lambda value lam_cal and the ratio of the two or the difference is used as the input for the adaptation.
  • the lambda value can be calculated as follows:
  • lam cal can be calculated as follows:
  • Lam_cal MAF / (LST * K_hum * MFF)
  • K hum factor depending on water content (depending on humidity and intake air temperature)
  • the emission robustness and the accuracy of the adaptation via the air injection phase by the inclusion of the information relating to the humidity is considerably improved.
  • the nitrogen oxide emission are maintained with low particle emissions and reduces the consumption of fuel for filter regeneration.
  • the corresponding humidity sensors can be arranged both away from the internal combustion engine and in the intake region of the internal combustion engine before or in the intake tract.

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)

Abstract

The invention relates to a method of reducing soot emissions in internal combustion engines, wherein the humidity and the temperature of intake air are determined and the proportion of the water in the intake air is calculated therefrom, wherein there is a basic exhaust gas recirculation rate in the intake duct, and wherein an exhaust gas recirculation rate for each operation (speed and fuel mass) is predetermined for a reference humidity and a reference intake air temperature, wherein, for deviations of the water content in the intake air relative to the reference value, changes in the exhaust gas recirculation rate are filed in characteristics, wherein, if the water proportion in the intake air increases relative to the reference value, the exhaust gas recirculation rate is reduced with reference to the characteristics.

Description

Beschreibungdescription
Verfahren zur Reduzierung von Ruß-Emissionen bei BrennkraftmaschinenMethod for reducing soot emissions in internal combustion engines
Die Erfindung betrifft ein Verfahren zur Reduzierung von Ruß- Emission bei Brennkraftmaschinen.The invention relates to a method for reducing soot emission in internal combustion engines.
Aus der DE 19750496 Al ist ein Verfahren zur Bestimmung der von einer Brennkraftmaschine angesaugten Luft und ein Sensor für eine Brennkraftmaschine bekannt. Das dort dargestellte Verfahren bildet herkömmliche Verfahren weiter, bei denen die von einer Brennkraftmaschine angesaugte Luftmasse mittels eines Luftmassenmessers verfasst wird. Bei diesem herkömmlichen Verfahren wird die erfasste Luftmasse in einer Motorsteuerung zusammen mit anderen für denDE 19750496 A1 discloses a method for determining the air taken in by an internal combustion engine and a sensor for an internal combustion engine. The method shown there further forms conventional methods in which the air mass drawn in by an internal combustion engine is written by means of an air mass meter. In this conventional method, the detected air mass in an engine control together with others for the
Verbrennungsvorgang relevanten Daten, wie beispielsweise der Temperatur oder der Saugrohrdruck zur Berechnung von Einspritzzeiten und dergleichen verarbeitet.Combustion process relevant data, such as the temperature or the intake manifold pressure for calculating injection times and the like processed.
Nachteilig bei diesem Verfahren ist, dass bei der Bestimmung der Luftmassengroße verändernde Großen, welche die Luftmasse beeinflussen, nicht mit erfasst werden. Eine derartige die Luftmasse verändernde Große ist beispielsweise die Luftfeuchtigkeit. Bei einer sehr feuchten Umgebungsluft wird aufgrund der Luftfeuchtigkeit der von dem Luftmassenmesser erfasste Luftmassenstrom dadurch verfälscht, dass neben der in der Brennkraftmaschine verbrennbaren Luft auch gleichzeitig Wasserdampf erfasst wird, der nicht verbrannt werden kann und daher zu sehr nachteiligen Änderungen der Emissionswerte fuhrt.A disadvantage of this method is that when determining the air mass size changing large, which affect the air mass, are not included. Such a mass that changes the air mass is for example the humidity. In the case of a very humid ambient air, the air mass flow detected by the air mass meter is falsified due to the humidity in that, in addition to the combustible air in the internal combustion engine, water vapor is simultaneously detected which can not be burned and therefore leads to very disadvantageous changes in the emission values.
Die DE 19750496 Al schlagt hierzu vor, die zusatzliche Erfassung und Auswertung der Luftfeuchtigkeit der angesaugten Luft durchzufuhren, wobei ein Luftfeuchtesensor eingesetzt wird. Hierdurch wird der angesaugte Massenstrom gasformigen Wassers von dem in der Brennkraftmaschine verbrennbaren Luftmassenstrom unterschieden. Dies hat zur Folge, dass der Steuerschaltung der Brennkraftmaschine präzisere Ausgangsdaten zur Verfugung gestellt werden, sowie wesentlich präzisere Lastsignale und weitere den Verbrennungsvorgang bestimmende Signale berechnet und ausgegeben werden.DE 19750496 Al proposes for this purpose to carry out the additional detection and evaluation of the air humidity of the intake air, wherein an air humidity sensor is used. As a result, the sucked mass flow of gaseous water is distinguished from the combustible in the internal combustion engine air mass flow. As a result, the Control circuit of the internal combustion engine more precise output data are provided, as well as much more precise load signals and other combustion-determining signals calculated and output.
Aus der US 6,647,972 B2 ist eine Vorrichtung zur Zustandsbestimmung eines Abgasruckfuhrungssystems zur genauen Ermittlung des Zustandes eines Abgasruckfuhrungssystems umfassend einen Abgasruckfuhrungsdurchlass vorgesehen. Die Vorrichtung zur Bestimmung des Zustandes umfasst einen Feuchtigkeitssensor, der im Abgasruckfuhrungsdurchlass angeordnet ist, zum Ermitteln einer Feuchtigkeit innerhalb des Abgasruckfuhrungsdurchlasses . Mit der Vorrichtung wird der Feuchtegehalt des ruckgefuhrten Abgases ermittelt, wobei anhand der ermittelten Feuchtigkeit der Zustand des Abgasruckfuhrungssystems umfassend denFrom US 6,647,972 B2, a device for determining the state of a Abgasruckfuhrungssystems for accurately determining the state of a Abgasruckfuhrungssystems comprising a Abgasruckfuhrungsdurchlass is provided. The apparatus for determining the condition includes a humidity sensor disposed in the exhaust gas discharge passage for detecting a humidity within the exhaust gas discharge passage. With the device, the moisture content of the returned exhaust gas is determined, wherein based on the determined moisture, the state of the Abgasruckfuhrungssystems comprising the
Abgasruckfuhrungsdurchlass dargestellt wird. Über den Feuchtesensor werden mittelbar Ausfalle im Abgasruckfuhrungssystem ermittelt, beispielsweise ein Leck und ahnliches im Abgasruckfuhrungsdurchlass. Mit einer solchen Feuchtigkeitsermittlung wird eine bessere Zuverlässigkeit erreicht als mit Temperatursensoren, die ebenfalls eingesetzt werden, um beispielsweise Lecks aufzuspüren. Insbesondere ist diese Vorrichtung mit Vorteil dort einsetzbar, wo aufgrund einer besonders langenAbgasrückführungsdurchlass is shown. By means of the humidity sensor, failures in the exhaust gas delivery system are indirectly determined, for example a leak and the like in the exhaust gas discharge passage. With such a moisture detection better reliability is achieved than with temperature sensors, which are also used to detect leaks, for example. In particular, this device is advantageously used where, due to a particularly long
Abgasruckfuhrungsleitung aufgrund von Hydrationen Risse möglich sind, insbesondere bei Abgasruckfuhrungssystemen, in denen die Kohlenwasserstoffabsauger eingebaut sind.Abgasruckfuhrungsleitung due to hydration cracks are possible, especially in Abgasruckfuhrungssystemen, in which the Kohlenwasserstoffabsauger are installed.
Die Emissionswerte moderner Kraftfahrzeuge werden aufgrund behördlicher Anforderungen immer weiter abgesenkt. Hierfür werden Abgasnormen herausgegeben, die von Neufahrzeugen einzuhalten sind. Hiervon sind nicht nur Emissionen in gasformiger Form betroffen, sondern auch Emissionen von Rußpartikeln, welche einen gewissen Anteil an der Gesamtfeinstaubbelastung bilden. Die Ruß-Emissionen hangen jedoch ganz erheblich auch von den Umweltbedingungen ab. Bei der Anwendung werden daher Reserven im Gesamtsystem eingebaut, damit das System gegenüber Änderungen dieser Umweltbedingungen robust bleibt. So wird zum Beispiel bei EU4-Anwendungen bzw. -Systemen dieThe emission values of modern motor vehicles are being lowered further and further due to regulatory requirements. For this purpose, emission standards are issued, which are to be observed by new vehicles. This not only affects emissions in gaseous form, but also emissions of soot particles, which account for a certain proportion of total fine dust pollution. However, soot emissions also depend very much on environmental conditions. During use, therefore, reserves are built into the overall system to keep the system robust to changes in these environmental conditions. For example, in EU4 applications or systems, the
Abgasruckfuhr-Rate (EGR-Rate) zur Reduzierung von Stickoxiden nicht so hoch aufgebracht, damit sich bei einer Erhöhung von Feuchtigkeit der Ansaugluft im Feld die Ruß-Emission nicht dramatisch erhöht. Bei der zu erwartenden Verschärfung der Anforderung an die Emissionen von Kraftfahrzeugen, insbesondere der EU5 Abgasnormen ist es aber notwendig, diese bislang ausreichende Reserve abzubauen. UmEGR rate is not applied so high to reduce nitrogen oxides so that soot emission does not increase dramatically as the intake air humidity in the field increases. However, in view of the expected tightening of the requirement for emissions from motor vehicles, in particular the EU5 emission standards, it is necessary to reduce this reserve, which has hitherto been sufficient. Around
Stickoxidemissionen zu reduzieren, wird es daher notwendig werden, die Abgasruckfuhrungsrate an eine Grenze zu bringen und dennoch die Partikel-Emission nicht dramatisch ansteigen zu lassen.Therefore, to reduce nitrogen oxide emissions, it will be necessary to bring the exhaust gas recirculation rate to a limit and still not increase the particulate emission dramatically.
Aufgabe der Erfindung ist es, das Ruß-Emissions-Niveau eines Fahrzeuges unabhängig von den Umweltbedingungen im Feld einzuhalten, um bei Systemen ohne Partikelfilter den Grenzwert nicht zu überschreiten.The object of the invention is to comply with the soot emission level of a vehicle regardless of the environmental conditions in the field in order not to exceed the limit in systems without particulate filter.
Eine weitere Aufgabe ist es, dieAnother task is the
Filterregenerationshaufigkeit bei Systemen mit Ruß-Partikel- Filtern zu reduzieren, um letztlich auch den Verbrauch zu reduzieren .To reduce filter regeneration frequency in systems with soot-particulate filters, in order to ultimately reduce consumption.
Die Aufgabe wird mit einem Verfahren mit den Merkmalen des Anspruchs 1 gelost.The object is achieved by a method having the features of claim 1.
Vorteilhafte Weiterbildungen sind in Unteranspruchen gekennzeichnet .Advantageous developments are characterized in dependent claims.
Die Aufgaben werden erfindungsgemaß dadurch gelost, dass die Feuchtigkeit und die Ansauglufttemperatur und/oder dieThe objects are achieved according to the invention in that the humidity and the intake air temperature and / or
Umgebungstemperatur ermittelt werden und bei der Regelung der Abgasruckfuhrung berücksichtigt werden. Die Information über die Feuchtigkeit kann von einem Sensor (zum Beispiel in der Klimaanlage, dem Kombiinstrument oder dem Navigationssystem oder anderen Sensoren) kommen. Aus dem ermittelten oder berechneten Feuchtegehalt und der Ansauglufttemperatur wird der Anteil des Wassers in derAmbient temperature can be determined and taken into account in the regulation of Abgasruckfuhrung. The information about the humidity can come from a sensor (for example in the air conditioning system, the instrument cluster or the navigation system or other sensors). From the calculated or calculated moisture content and the intake air temperature, the proportion of water in the
Ansaugluft berechnet. Abhangig vom Anteil des Wassers in der Ansaugluft wird die Basis-Abgasruckfuhrungsrate korrigiert, damit unter Beibehaltung des Stickoxidemissionswerts die Partikel-Emission bei Änderungen der Feuchtigkeit nicht ansteigt. Bei der Anwendung wird bei jedem Betriebspunkt (Drehzahl und Kraftstoffmasse) und bei einem Referenzwasseranteil (Referenzfeuchtigkeit und Referenzansauglufttemperatur) eine Abgasruckfuhrungsrate ausgegeben und angewendet. Wenn der Wasseranteil durch Feuchtigkeit sich gegenüber dem Referenzwert erhöht, wird die Abgasruckfuhrungsrate anhand von Berechnungsmodellen, die in Kennlinien abgelegt sind, reduziert. Wenn der Wasseranteil sich durch Feuchtigkeit gegenüber dem Referenzwert reduziert, wird die Abgasruckfuhrungsrate anhand eines Kennlinienmodells erhöht.Intake air calculated. Depending on the proportion of water in the intake air, the base exhaust gas recirculation rate is corrected so that, while maintaining the nitrogen oxide emission value, the particulate emission does not increase with changes in humidity. In the application, at each operating point (speed and fuel mass) and at a reference water level (reference humidity and reference intake air temperature), an exhaust gas recirculation rate is output and applied. When the moisture content of water increases relative to the reference value, the exhaust gas recirculation rate is reduced based on calculation models stored in characteristics. If the water content is reduced by moisture relative to the reference value, the Abgasruckuhrungsrate is increased by a characteristic model.
Bei einer vorteilhaften Weiterbildung der Erfindung wird, wenn im System ein Lambdasensor vorhanden ist, bei hoher Last und niedrigen Lambdawert der Wert von Lamda zur Adaption der gemessenen Luftmasse und/oder des Abgasruckfuhrungsstromes und/oder der Kraftstoffmasse verwendet. Bei dieser Korrektur wird der Wasseranteil über die Informationen bezuglich der Feuchtigkeit und der Ansauglufttemperatur berücksichtigt. Bei der Anpassung wird der gemessene Lambdawert lam real mit dem gerechneten Lambdawert lam_cal verglichen und das Verhältnis der beiden bzw. die Differenz als Eingang für die Anpassung verwendet .In an advantageous development of the invention, when a lambda sensor is present in the system, at high load and low lambda value, the value of lambda is used to adapt the measured air mass and / or the exhaust gas flow and / or fuel mass. In this correction, the water content is taken into account via the information relating to the humidity and the intake air temperature. During the adaptation, the measured lambda value lam is compared in real terms with the calculated lambda value lam_cal and the ratio of the two or the difference is used as the input for the adaptation.
Der Lambdawert kann hierbei wie folgt berechnet werden:The lambda value can be calculated as follows:
Lam_cal = MAF/ (Lst*MFF) Mit MAF = gemessene Luftmasse im ZylinderLam_cal = MAF / (Lst * MFF) With MAF = measured air mass in the cylinder
Lst = Faktor für stöchiometrisches VerhältnisLst = factor for stoichiometric ratio
MFF = eingespritzte KraftstoffmasseMFF = injected fuel mass
Wenn die Feuchtigkeit variiert, kann lam cal wie folgt berechnet werden:If the humidity varies, lam cal can be calculated as follows:
Lam_cal = MAF/ (LST*K_hum*MFF)Lam_cal = MAF / (LST * K_hum * MFF)
MitWith
K hum = Faktor abhängig vom Wasseranteil (damit abhängig von Feuchtigkeit und Ansauglufttemperatur)K hum = factor depending on water content (depending on humidity and intake air temperature)
Mit steigender Feuchtigkeit wird K hum größer und mit sinkender Feuchtigkeit wird K_hum kleiner.With increasing humidity K hum gets bigger and with decreasing humidity K_hum gets smaller.
Bei der Erfindung ist von Vorteil, dass die Emissionsrobustheit und die Genauigkeit der Anpassung über die Lufteinspritzphase durch Einbeziehung der Informationen bezüglich der Luftfeuchtigkeit erheblich verbessert wird. Hierdurch werden die Stickoxidemission bei gleichzeitig niedrigen Partikel-Emissionen eingehalten und der Verbrauch von Kraftstoff zur Filterregeneration reduziert.In the invention, it is advantageous that the emission robustness and the accuracy of the adaptation via the air injection phase by the inclusion of the information relating to the humidity is considerably improved. As a result, the nitrogen oxide emission are maintained with low particle emissions and reduces the consumption of fuel for filter regeneration.
Die entsprechenden Feuchtesensoren können sowohl entfernt von der Brennkraftmaschine als auch im Ansaugbereich der Brennkraftmaschine vor oder im Ansaugtrakt angeordnet sein. The corresponding humidity sensors can be arranged both away from the internal combustion engine and in the intake region of the internal combustion engine before or in the intake tract.

Claims

Patentansprüche claims
1. Verfahren zur Reduzierung von Ruß-Emission bei Brennkraftmaschinen, wobei die Feuchtigkeit und die1. A method for reducing soot emission in internal combustion engines, wherein the humidity and the
Temperatur einer Ansaugluft ermittelt werden und hieraus der Anteil des Wassers in der Ansaugluft berechnet wird, wobei eine Basis-Abgasruckfuhrungsrate des Abgases in den Ansaugstrang vorhanden ist und wobei für eine Referenzfeuchtigkeit und eineTemperature of an intake air are determined and from this the proportion of water in the intake air is calculated, wherein a base Abgasruckfuhrungsrate of the exhaust gas is present in the intake manifold and wherein for a reference humidity and a
Referenzansauglufttemperatur eine Abgasruckfuhrungsrate für jeden Betrieb (Drehzahl und Kraftstoffmasse) vorgegeben wird, wobei für Abweichungen des Wassergehalts in der Ansaugluft gegenüber dem Referenzwert Änderungen der Abgasruckfuhrungsrate in Kennlinien abgelegt sind, wobei bei sich erhöhendem Wasseranteil in der Ansaugluft gegenüber dem Referenzwert die Abgasruckfuhrungsrate anhand der Kennlinien reduziert wird.Referenzansauglufttemperatur an exhaust gas recirculation rate for each operation (speed and fuel mass) is specified, for deviations of the water content in the intake air to the reference value changes the Abgasruckfuhrungsrate are stored in curves, with an increasing proportion of water in the intake air compared to the reference value reduces the Abgasruckfuhrungsrate based on the characteristics becomes.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Abgasruckfuhrungsrate anhand der Kennlinien erhöht wird, wenn der Wasseranteil gegenüber dem Referenzwert niedriger ist.2. The method according to claim 1, characterized in that the Abgasruckfuhrungsrate is increased based on the characteristics, when the proportion of water is lower than the reference value.
3. Verfahren nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, dass beim Vorhandensein eines Lambdasensors bei hoher Last und niedrigerem Lambdawert der Wert von Lambda zur Adaption der gemessenen Luftmasse und/oder des Abgasruckfuhrungsstromes und/oder der Kraftstoffmasse verwendet wird.3. The method of claim 1 and / or 2, characterized in that in the presence of a lambda sensor at high load and lower lambda value, the value of lambda for adapting the measured air mass and / or the Abgasruckfuhrungsstromes and / or the fuel mass is used.
4. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei der Anpassung der gemessene Lambdawert mit dem gerechneten Lambdawert verglichen und das Verhältnis der beiden bzw. die Differenz als Eingang für eine Anpassung verwendet wird.4. The method according to one or more of the preceding claims, characterized in that in the Adjustment of the measured lambda value compared with the calculated lambda value and the ratio of the two or the difference is used as an input for an adjustment.
5. Verfahren nach einem oder mehreren der vorhergehenden5. The method according to one or more of the preceding
Ansprüche, dadurch gekennzeichnet, dass der Lambdawert wie folgt berechnet wird:Claims, characterized in that the lambda value is calculated as follows:
Lam_cal = MAF/ (Lst*MFF)Lam_cal = MAF / (Lst * MFF)
MitWith
MAF = gemessene Luftmasse im Zylinder Lst = Faktor für stöchiometrisches Verhältnis MFF = eingespritzte KraftstoffmasseMAF = measured air mass in cylinder Lst = factor for stoichiometric ratio MFF = injected fuel mass
6. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei sich variierender Feuchtigkeit der gerechnete Lambdawert wie folgt berechnet wird:6. Method according to one or more of the preceding claims, characterized in that, when the humidity varies, the calculated lambda value is calculated as follows:
Lam_cal = MAF/ (LST*K_hum*MFF)Lam_cal = MAF / (LST * K_hum * MFF)
MitWith
K_hum = Faktor abhängig vom Wasseranteil (damit abhängig von Feuchtigkeit und Ansauglufttemperatur)K_hum = factor depending on water content (depending on humidity and intake air temperature)
7. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mit entsprechenden Feuchtesensoren entfernt von der Brennkraftmaschine oder im Ansaugbereich der Brennkraftmaschine vor oder im Ansaugtrakt gemessen wird. 7. The method according to one or more of the preceding claims, characterized in that is measured with appropriate humidity sensors away from the internal combustion engine or in the intake of the engine before or in the intake.
EP07703856A 2006-04-05 2007-01-15 Method of reducing soot emissions in internal combustion engines Withdrawn EP2004972A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006015970A DE102006015970B4 (en) 2006-04-05 2006-04-05 Method for reducing soot emissions in internal combustion engines
PCT/EP2007/050340 WO2007113014A1 (en) 2006-04-05 2007-01-15 Method of reducing soot emissions in internal combustion engines

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EP2004972A1 true EP2004972A1 (en) 2008-12-24

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EP07703856A Withdrawn EP2004972A1 (en) 2006-04-05 2007-01-15 Method of reducing soot emissions in internal combustion engines

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CN (1) CN101466931A (en)
DE (1) DE102006015970B4 (en)
WO (1) WO2007113014A1 (en)

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