DE10216278B4 - Method for determining a NOx concentration - Google Patents
Method for determining a NOx concentration Download PDFInfo
- Publication number
- DE10216278B4 DE10216278B4 DE10216278A DE10216278A DE10216278B4 DE 10216278 B4 DE10216278 B4 DE 10216278B4 DE 10216278 A DE10216278 A DE 10216278A DE 10216278 A DE10216278 A DE 10216278A DE 10216278 B4 DE10216278 B4 DE 10216278B4
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- Prior art keywords
- temperature
- nox
- humidity
- air
- storage catalyst
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
-
- 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
- F02D41/146—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 an NOx content or concentration
- F02D41/1461—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 an NOx content or concentration of the exhaust gases emitted by the engine
- F02D41/1462—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 an NOx content or concentration of the exhaust gases emitted by the engine with determination means using an estimation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/03—Monitoring or diagnosing the deterioration of exhaust systems of sorbing activity of adsorbents or absorbents
-
- 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
- F02D2200/0414—Air temperature
-
- 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
-
- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Verfahren
zur Bestimmung einer NOx-Konzentration bei einer Brennkraftmaschine
(10), die eine Speicherkatalysatorsteuerung (36) und einen NOx-Speicherkatalysator
(26) aufweist, bei dem Verfahren misst ein Temperaturfühler (20)
eine Lufttemperatur und eine Sauerstoffsonde (28) stromaufwärts von
dem NOx-Speicherkatalysator (26) den im Abgas enthaltenen Sauerstoffgehalt
im Schubbetrieb der Brennkraftmaschine (10), gekennzeichnet durch
die folgenden Verfahrensschritte:
– die Speicherkatalysatorsteuerung
(36) schätzt
oberhalb einer vorbestimmten Mindesttemperatur eine Luftfeuchte aufgrund
des Sauerstoffgehalts und der Lufttemperatur ab und
– aus der
abgeschätzten
Luftfeuchte wird ein Korrekturfaktor (66) für den Wert der NOx-Konzentration
(64) in dem Abgas stromaufwärts
von dem NOx-Speicherkatalysator bestimmt.A method of determining an NOx concentration in an internal combustion engine (10) having a storage catalyst controller (36) and a NOx storage catalyst (26), wherein the method, a temperature sensor (20) measures an air temperature and an oxygen probe (28) upstream thereof NOx storage catalyst (26) the oxygen content contained in the exhaust gas in the overrun operation of the internal combustion engine (10), characterized by the following process steps:
- The storage catalyst control (36) estimates above a predetermined minimum temperature, a humidity due to the oxygen content and the air temperature from and
From the estimated air humidity, a correction factor (66) for the value of the NOx concentration (64) in the exhaust gas upstream of the NOx storage catalytic converter is determined.
Description
Die Erfindung betrifft ein Verfahren zur Bestimmung einer NOx-Konzentration bei einer Brennkraftmaschine, die eine Speicherkatalysator-Steuerung und einen NOx-Speicherkatalysator besitzt.The The invention relates to a method for determining a NOx concentration in an internal combustion engine having a storage catalyst controller and has a NOx storage catalyst.
Bei NOx-Speicherkatalysatoren, die auch als NOx-Speicherreduktionskatalysatoren bezeichnet werden, werden in einer Beladungsphase NOx-Verbindungen aus dem Abgas gespeichert. NOx-Verbindungen entstehen verstärkt bei einer mageren Verbrennung. Auf die Beladungsphase folgt eine Regenerationsphase, in der die gespeicherten NOx-Verbindungen in unschädliche Verbindungen umgewandelt werden. Die Umwandlung erfolgt durch Reduktion, die durch Zugabe eines Reduktionsmittels ausgelöst wird. Als Reduktionsmittel können bei einer Otto-Brennkraftmaschine (CO, H2 und HC) durch kurzzeitiges Betreiben der Brennkraftmaschine mit einem Fettzyklus erzeugt werden.In NOx storage catalysts, which are also referred to as NOx storage reduction catalysts, NOx compounds are stored from the exhaust gas in a loading phase. NOx compounds are increasingly produced by lean combustion. The loading phase is followed by a regeneration phase in which the stored NOx compounds are converted into harmless compounds. The conversion takes place by reduction, which is triggered by the addition of a reducing agent. As a reducing agent can be generated in a gasoline engine (CO, H 2 and HC) by brief operation of the internal combustion engine with a rich cycle.
Der
Adsorptionswirkungsgrad des NOx-Speicherkatalysators fällt mit
höherem
NOx-Beladungsgrad ab. Als Beladungsgrad wird hierbei der Quotient
aus momentaner NOx-Beladung (absolut) und der maximalen NOx-Speicherkapazität definiert. Der
Beladungsgrad dient einer Steuerung der Mager- und Fettzyklen. Für eine genaue
Bestimmung des Beladungsgrades ist es erforderlich, die momentane Beladung
und die maximale Speicherkapazität
zu kennen. Die maximale Speicherkapazität für den Speicherkatalysator wird
vorab auf einem Motorprüfstand
durch Messung der eingelagerten NOx-Menge pro Zeiteinheit bis zum
Erreichen eines Sättigungszustandes
ermittelt. Da die Speicherfähigkeit
einem Alterungsprozess unterliegt, kann der Wert für die Speicherfähigkeit über die
Fahrzeuglaufstrecke adaptiert werden. Ein solches Verfahren ist
von der Anmelderin in
Wie vorstehend ausgeführt, benötigt die Katalysatorsteuerung einen möglichst genauen Wert der NOx-Rohkonzentration, also der NOx-Konzentration im Abgas stromaufwärts von einem Katalysator. Verfahren zur Adaption der Speicherkapazität vergleichen dabei häufig ein Beladungsmodell mit einer Messung und Abschätzung der gespeicherten NOx-Menge, die während einer sich an eine Magerphase anschließenden Fettphase durchgeführt wird. Eine Messung der Rohemission ist zwar technisch möglich, kommt aber aus wirtschaftlichen Gründen nicht zum Einsatz, so dass die Rohemission modelliert werden muss.As stated above, needed the catalyst control one possible exact value of the NOx raw concentration, ie the NOx concentration in the exhaust upstream from a catalyst. Compare the method of adapting the storage capacity often a loading model with a measurement and estimation of the stored amount of NOx, the while a lean phase subsequent to a lean phase is performed. A Although measurement of the raw emission is technically possible, it comes from economic Not reasons used, so that the raw emission must be modeled.
Bei der Modellierung der NOx-Rohemission tritt das Problem auf, das diese im realen Fahrbetrieb starken Schwankungen unterworfen ist.at The modeling of the raw NOx emission poses the problem that this is subject to strong fluctuations in real driving.
Aus
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, das mit einfachen Mitteln möglichst zuverlässig die NOx-Rohemission bestimmt.Of the Invention has for its object to provide a method as simple as possible reliable the raw NOx emission is determined.
Erfindungsgemäß wird die Aufgabe durch ein Verfahren mit den Merkmalen aus Anspruch 1 gelöst. Vorteilhafte Ausgestaltungen bilden den Gegenstand der Unteransprüche.According to the invention Problem solved by a method having the features of claim 1. advantageous Embodiments form the subject of the dependent claims.
Bei dem erfindungsgemäßen Verfahren zur Bestimmung einer NOx-Konzentration bei einer Brennkraftmaschine wird über einen Temperaturfühler eine Lufttemperatur erfasst. Oberhalb einer vorbestimmten Mindesttemperatur schätzt die Speicherkatalysatorsteuerung einen Wert für die Luftfeuchte ab. Aufgrund der abgeschätzten Luftfeuchte wird ein Korrekturfaktor für den Wert der NOx-Konzentration in dem Abgas stromaufwärts von dem NOx-Speicherkatalysator bestimmt.at the method according to the invention for determining a NOx concentration in an internal combustion engine is via a temperature sensor a Air temperature recorded. Above a predetermined minimum temperature estimates the storage catalytic converter control a value for the humidity. by virtue of the estimated Humidity will be a correction factor for the value of the NOx concentration in the exhaust upstream determined by the NOx storage catalyst.
Der Erfindung liegt die Erkenntnis zugrunde, dass die Luftfeuchte und damit der Wassergehalt der Luft bei der Verbrennung einen Einfluss auf die Konzentration von NOx-Verbindungen in den Verbrennungsprodukten hat. Ferner beruht das erfindungsgemäße Verfahren auf der Erkenntnis, dass die Abhängigkeit von der Luftfeuchte mit einem multiplikativen Faktor modelliert werden kann. In der Luft sind je nach Luftdruck und -temperatur unterschiedliche Wasserdampfmengen vorhanden. Das Verhältnis der wirklich vorhandenen Wasserdampfmenge zu der bei gegebenem Druck und gegebener Temperatur möglichen Wasserdampfmenge, ausgedrückt in Prozent, wird als relative Luftfeuchte bezeichnet. Für die Brennkraftmaschine kann die Abhängigkeit vom Luftdruck unberücksichtigt bleiben, so dass oberhalb einer vorbestimmten Mindesttemperatur ein Wert für die Luftfeuchte abhängig von der Temperatur bestimmt wird.Of the Invention is based on the finding that the humidity and so that the water content of the air during combustion has an influence on the concentration of NOx compounds in the combustion products. Furthermore, the method according to the invention is based on the realization that dependence modeled on the humidity with a multiplicative factor can be. In the air are depending on air pressure and temperature different amounts of water vapor available. The ratio of really existing amount of steam at the given pressure and given Temperature possible Amount of water vapor expressed in percent, is called relative humidity. For the internal combustion engine can the dependence unconsidered by the air pressure stay so that above a predetermined minimum temperature a value for the Humidity dependent determined by the temperature.
Bei dem erfindungsgemäßen Verfahren misst eine Sauerstoffsonde stromaufwärts von dem NOx-Speicherkatalysator den in der Luft enthaltenen Sauerstoffgehalt im Schubbetrieb der Brennkraftmaschine. Die Speicherkatalysatorsteuerung bestimmt aufgrund des Sauerstoffgehalts und der Lufttemperatur den Wert für die Luftfeuchte. Diesem Schritt liegt die Überlegung zugrunde, dass die reguläre Sauerstoffkonzentration in der Luft mit ungefähr 21% bekannt ist. Misst die Lambdasonde nun im Schubbetrieb eine von dieser Konzentration abweichende, geringere Sauerstoffkonzentration, wird angenommen, dass diese durch eine erhöhte Luftfeuchte gesunken ist. Dieser Effekt ist bei Raumtemperatur vernachlässigbar, jedoch bei Temperaturen oberhalb von 30°C macht er sich bemerkbar.In the method according to the invention, an oxygen probe upstream of the NOx storage catalytic converter measures the oxygen content in the air during overrun operation of the internal combustion engine. The storage catalyst control determines due to the oxygen content and the air temperature the value for the humidity. This step is based on the idea that the regular oxygen concentration in the air is known to be around 21%. If the lambda probe now measures a lower oxygen concentration that deviates from this concentration during overrun, it is assumed that this has fallen due to increased air humidity. This effect is negligible at room temperature, but at temperatures above 30 ° C, it is noticeable.
In einer Weiterentwicklung des Verfahrens wird die Luftfeuchte oberhalb der Mindesttemperatur und unterhalb einer Maximaltemperatur abhängig von dem durch eine Sauerstoffsonde gefühlten Sauerstoffgehalt und der Temperatur bestimmt. Ferner wird für Temperaturwerte oberhalb der Maximaltemperatur die Luftfeuchte auf einen von der Temperatur unabhängigen Maximalwerte der Luftfeuchte bestimmt. Bei dieser Weiterentwicklung können drei Temperaturintervalle unterschieden werden. Unterhalb einer Minimaltemperatur bleibt die Luftfeuchte un berücksichtigt. In einem Temperaturintervall von der Minimaltemperatur bis zur Maximaltemperatur, erfolgt die Schätzung der Luftfeuchte aufgrund des von der Sauerstoffsonde bestimmten Werts. Durch die Beschränkung der Schätzung der Luftfeuchte auf gewisse Temperaturintervalle erfolgt eine Plausibilisierung der Korrekturfaktoren.In a further development of the process, the humidity is above the minimum temperature and below a maximum temperature depends on the oxygen content and oxygen content as sensed by an oxygen probe the temperature determined. Furthermore, for temperature values above the maximum temperature the humidity to a temperature independent of the maximum values the humidity determined. In this development, three temperature intervals be differentiated. Below a minimum temperature remains the Humidity and not taken into account. In a temperature interval from the minimum temperature to the maximum temperature occurs the estimation the humidity due to the determined by the oxygen probe Value. By the restriction the estimate the humidity in certain temperature intervals is plausibility the correction factors.
In einer weiteren möglichen Ausgestaltung des erfindungsgemäßen Verfahrens wird ein Temperaturbereich nicht in drei Bereich unterteilt, sondern erfolgt für jede Temperatur oberhalb der vorbestimmten Mindesttemperatur eine Schätzung der Luftfeuchte auf den von der Lufttemperatur abhängigen Maximalwert. Alternativ hierzu kann die Schätzung der Luftfeuchte oberhalb der Mindesttemperatur auch abhängig von dem gemessenen Sauerstoffgehalt erfolgen.In another possible Embodiment of the method according to the invention a temperature range is not divided into three areas, but takes place for every Temperature above the predetermined minimum temperature an estimate of Humidity at the maximum value dependent on the air temperature. alternative For this, the estimate of the Humidity above the minimum temperature also depends on the measured oxygen content.
Die Abschätzung der Luftfeuchte durch die Speicherkatalysatorsteuerung schließt ebenfalls Verfahren ein, die mit einem oder mehreren Luftfeuchtesensoren arbeiten.The appraisal the humidity through the storage catalyst control also closes Procedures that work with one or more humidity sensors.
Ein bevorzugten Ausführungsbeispiel wird nachfolgend anhand der Figuren näher erläutert.One preferred embodiment will be explained in more detail with reference to FIGS.
In
Der
Brennkraftmaschine
Zusätzlich in
dem Ansaugkanal
Ausgangsseitig
von der Brennkraftmaschine
In
dem Abgastrakt
Eine
Steuereinrichtung für
die Abgasnachbehandlung ist allgemein mit
Mit
Bezug auf
Das
hier beschriebene Modell für
die Rohemission betrifft den Schichtbetrieb der Brennkraftmaschine.
Es können
auch andere Modelle zur Bestimmung der NOx-Rohkonzentration
Claims (7)
Priority Applications (1)
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DE10216278A DE10216278B4 (en) | 2002-04-12 | 2002-04-12 | Method for determining a NOx concentration |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE10216278A DE10216278B4 (en) | 2002-04-12 | 2002-04-12 | Method for determining a NOx concentration |
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Publication Number | Publication Date |
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DE10216278A1 DE10216278A1 (en) | 2003-11-06 |
DE10216278B4 true DE10216278B4 (en) | 2005-05-04 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010027882A1 (en) * | 2010-04-16 | 2011-10-20 | Bayerische Motoren Werke Aktiengesellschaft | Method for controlling internal combustion engine i.e. petrol engine, involves adjusting firing angle and/or charging air pressure based on air humidity, air temperature and/or ambient pressure, and limiting peak pressure in cylinder |
DE102013212217A1 (en) | 2012-07-12 | 2014-05-15 | Ford Global Technologies, Llc | Indirect measurement of relative humidity |
DE102016201354A1 (en) * | 2016-01-29 | 2017-08-03 | Continental Automotive Gmbh | Procedure for checking a humidity sensor |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007042748B4 (en) * | 2007-09-07 | 2009-06-25 | Testo Ag | Method and device for engine exhaust gas measurement |
DE102008036418B4 (en) * | 2008-08-05 | 2010-04-29 | Continental Automotive Gmbh | Method and apparatus for controlling exhaust aftertreatment |
US8166749B2 (en) * | 2009-02-12 | 2012-05-01 | GM Global Technology Operations LLC | Exhaust treatment diagnostic system and method |
US9382861B2 (en) | 2013-02-22 | 2016-07-05 | Ford Global Technologies, Llc | Humidity Sensor Diagnostics |
DE102014202659B4 (en) * | 2014-02-13 | 2017-08-31 | Ford Global Technologies, Llc | Exhaust gas recirculation method, motor vehicle |
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DE69005322T2 (en) * | 1989-02-02 | 1994-05-19 | Nippon Catalytic Chem Ind | Process for reducing nitrogen oxides from diesel engine exhaust. |
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WO2000053902A1 (en) * | 1999-03-11 | 2000-09-14 | Volkswagen Aktiengesellschaft | Method of desulfating an nox storage catalyst |
DE19918591A1 (en) * | 1999-04-23 | 2000-10-26 | Fev Motorentech Gmbh | Engine operation making good use of water from exhaust gases, recovers water with advanced membrane, to be injected in air inlet manifold and to be mixed with solid urea for injection into exhaust ahead of catalyst |
DE10038227A1 (en) * | 1999-08-06 | 2001-02-22 | Hitachi Ltd | Exhaust gas purification device comprises nitrogen oxides adsorption catalyst arranged in exhaust gas channel of engine and control unit |
DE10137421A1 (en) * | 2000-08-01 | 2002-02-14 | Honda Motor Co Ltd | Exhaust emission control system for an internal combustion engine |
-
2002
- 2002-04-12 DE DE10216278A patent/DE10216278B4/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69005322T2 (en) * | 1989-02-02 | 1994-05-19 | Nippon Catalytic Chem Ind | Process for reducing nitrogen oxides from diesel engine exhaust. |
DE19851564C2 (en) * | 1998-11-09 | 2000-08-24 | Siemens Ag | Method for operating and checking a NOx storage reduction catalytic converter of a lean-burn internal combustion engine |
WO2000053902A1 (en) * | 1999-03-11 | 2000-09-14 | Volkswagen Aktiengesellschaft | Method of desulfating an nox storage catalyst |
DE19918591A1 (en) * | 1999-04-23 | 2000-10-26 | Fev Motorentech Gmbh | Engine operation making good use of water from exhaust gases, recovers water with advanced membrane, to be injected in air inlet manifold and to be mixed with solid urea for injection into exhaust ahead of catalyst |
DE10038227A1 (en) * | 1999-08-06 | 2001-02-22 | Hitachi Ltd | Exhaust gas purification device comprises nitrogen oxides adsorption catalyst arranged in exhaust gas channel of engine and control unit |
DE10137421A1 (en) * | 2000-08-01 | 2002-02-14 | Honda Motor Co Ltd | Exhaust emission control system for an internal combustion engine |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010027882A1 (en) * | 2010-04-16 | 2011-10-20 | Bayerische Motoren Werke Aktiengesellschaft | Method for controlling internal combustion engine i.e. petrol engine, involves adjusting firing angle and/or charging air pressure based on air humidity, air temperature and/or ambient pressure, and limiting peak pressure in cylinder |
DE102013212217A1 (en) | 2012-07-12 | 2014-05-15 | Ford Global Technologies, Llc | Indirect measurement of relative humidity |
DE102016201354A1 (en) * | 2016-01-29 | 2017-08-03 | Continental Automotive Gmbh | Procedure for checking a humidity sensor |
DE102016201354B4 (en) * | 2016-01-29 | 2017-08-10 | Continental Automotive Gmbh | Procedure for checking a humidity sensor |
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DE10216278A1 (en) | 2003-11-06 |
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