DE102008064606A1 - Method for functional adjustment of exhaust gas cleaning device of drive arrangement for cleaning exhaust gas stream of internal combustion engine of vehicle, involves determining nitrogen oxides raw emissions of exhaust gas stream - Google Patents
Method for functional adjustment of exhaust gas cleaning device of drive arrangement for cleaning exhaust gas stream of internal combustion engine of vehicle, involves determining nitrogen oxides raw emissions of exhaust gas stream Download PDFInfo
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- DE102008064606A1 DE102008064606A1 DE102008064606A DE102008064606A DE102008064606A1 DE 102008064606 A1 DE102008064606 A1 DE 102008064606A1 DE 102008064606 A DE102008064606 A DE 102008064606A DE 102008064606 A DE102008064606 A DE 102008064606A DE 102008064606 A1 DE102008064606 A1 DE 102008064606A1
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- 239000007789 gas Substances 0.000 title abstract description 60
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title abstract description 9
- 238000004140 cleaning Methods 0.000 title abstract description 5
- 239000003054 catalyst Substances 0.000 claims abstract description 67
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 11
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 34
- 230000006978 adaptation Effects 0.000 claims description 32
- 238000000746 purification Methods 0.000 claims description 30
- 229910021529 ammonia Inorganic materials 0.000 claims description 17
- 230000008929 regeneration Effects 0.000 claims description 13
- 238000011069 regeneration method Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
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- 230000008901 benefit Effects 0.000 description 3
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- 238000006722 reduction reaction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
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- 239000004202 carbamide Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
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- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 241001156002 Anthonomus pomorum Species 0.000 description 1
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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
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
-
- 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
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/103—Oxidation catalysts for HC and CO only
-
- 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
- F01N2550/02—Catalytic activity of catalytic converters
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
-
- 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
- F02D41/029—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 particulate filter
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren für eine Funktionsanpassung einer Abgasreinigungsvorrichtung zur Reinigung eines Abgasstroms eines Verbrennungsmotors eines Kraftfahrzeuges mittels einer selektiven katalytischen Reduktion sowie eine Vorrichtung zum Durchführen des Verfahrens.The The invention relates to a method for a functional adaptation an exhaust gas purification device for purifying an exhaust gas stream an internal combustion engine of a motor vehicle by means of a selective catalytic reduction and a device for performing of the procedure.
Funktionsanpassungen
können bei sogenannten SCR-Systemen (selektive katalytische
Reduktion) eingesetzt werden, um beispielsweise über eine
Laufzeit des SCR-Systems auftretende Veränderungen an Komponenten
des SCR-Systems zu kompensieren. Für die Funktionsanpassung
können beispielsweise eine NOx-Rohemission
und weitere NOx-Mess-Werte ausgewertet werden.
Die
Aufgabe der Erfindung ist es, eine verbesserte Funktionsanpassung einer Abgasreinigungsvorrichtung zur Reinigung eines Abgasstroms eines Verbrennungsmotors bereitzustellen, insbesondere diese möglichst unabhängig von einem Alterungszustand von Komponenten der Abgasreinigungsvorrichtung durchführbar zu machen.task The invention is an improved functional adaptation of a Exhaust gas purification device for purifying an exhaust gas flow of a To provide internal combustion engine, in particular this possible regardless of a state of aging of components of the To make exhaust purification device feasible.
Die Erfindung ist mit den Merkmalen der unabhängigen Ansprüche gelöst.The Invention is with the features of the independent claims solved.
Erfindungsgemäß ist
bei einem Verfahren für eine Funktionsanpassung einer Abgasreinigungsvorrichtung
zur Reinigung eines Abgasstroms eines Verbrennungsmotors eines Kraftfahrzeuges
mittels einer selektiven katalytischen Reduktion vorgesehen:
Ermitteln
einer NOx-Rohemission des Abgasstroms des
Verbrennungsmotors, Einstellen einer zumindest in einem Mittel konstanten
Temperatur (
Determining a NO x raw emission of the exhaust gas flow of the internal combustion engine, setting a constant at least in an average temperature (
Vorteilhaft kann die Funktionsanpassung lediglich mittels der ermittelten Extremwertstelle durchgeführt werden. Vorteilhaft können weitere Informationen, beispielsweise über einen Alterungszustand weiterer Komponenten der Abgasreinigungsvorrichtung und/oder einen Füllstand des SCR-Katalysators für die Funktionsanpassung unberücksichtigt bleiben. Alternativ und/oder zusätzlich ist es jedoch denkbar, solche Informationen ebenfalls zu berücksichtigen.Advantageous the function adaptation can only be done by means of the determined extreme value position be performed. Advantageously, more Information, for example, about a state of aging more Components of the exhaust gas purification device and / or a level the SCR catalyst is not taken into account for the functional adjustment stay. Alternatively and / or additionally, however, it is conceivable to take such information into account as well.
Unter α-Wert wird ein tatsächlich im Abgasstrom vorhandener Wert eines Mengenverhältnisses eines Reduktionsmittels zu einer NOx-Rohemission, der beispielsweise mittels einer Messung ermittelbar ist, verstanden. Es ist denkbar, einen Soll-α-Wert zu definieren, der sich beispielsweise aus einer entsprechenden Soll-Einspritzmenge im Verhältnis zur NOx-Rohemission ergeben kann. Es ist denkbar, aus der vorgegebenen Soll-Einspritzmenge mittels eines Modells einer entsprechenden Dosiereinrichtung einen α-Wert zu ermitteln. Unter Extremwertstelle kann ein Wertepaar aus dem α-Wert und dem Extremwert der Katalysator-Leitgröße verstanden werden. Es ist jedoch auch denkbar, unter der Extremwertstelle lediglich den entsprechenden α-Wert zu verstehen, an dem die Katalysator-Leitgröße den Extremwert aufweist. Bei der Katalysator-Leitgröße kann es sich beispielsweise um eine Aktivität und/oder Umsetzungsrate des SCR-Katalysators handeln, beispielsweise zu berechnen als (1 minus NOx-Messwert stromabwärts des Katalysators) dividiert durch NOx-Rohemission. Es ist jedoch auch denkbar, dass in die Katalysator-Leitgröße weitere Größen eingehen, beispielsweise eine Konzentration von Kohlenmonoxid, Kohlendioxid und/oder Ammoniak, wie sie vor und/oder nach dem SCR-Katalysator in dem Abgasstrom ermittelbar, beispielsweise mittels eines Modells und/oder entsprechender Sensorik, sind.The α value is understood to mean a value of a quantity ratio of a reducing agent actually present in the exhaust gas flow to a raw NOx emission, which can be determined, for example, by means of a measurement. It is conceivable to define a desired α-value, which may result, for example, from a corresponding desired injection quantity in relation to the NO x raw emission. It is conceivable to determine an α-value from the predetermined nominal injection quantity by means of a model of a corresponding metering device. Under Extreme value point can be understood a pair of values from the α value and the extreme value of the catalyst guide. However, it is also conceivable to understand by the extreme value point only the corresponding α value at which the catalyst guide variable has the extreme value. The catalyst lead may be, for example, an activity and / or conversion rate of the SCR catalyst, for example calculated as (1 minus NO x reading downstream of the catalyst) divided by NO x bulk emissions. However, it is also conceivable that further variables are included in the catalyst guide variable, for example a concentration of carbon monoxide, carbon dioxide and / or ammonia, as can be determined before and / or after the SCR catalyst in the exhaust gas flow, for example by means of a model and / or corresponding sensors are.
Bei einer Ausführungsform des Verfahrens ist ein Ermitteln der Extremwertstelle, wobei die Katalysator-Leitgröße ein Maximum aufweist, vorgesehen. Falls es sich bei der Katalysator- Leitgröße um eine Aktivität und/oder Umsetzungsrate handelt, weist also der SCR-Katalysator an der Extremwertstelle eine maximale Aktivität auf.In one embodiment of the method, determining the extreme value location, wherein the catalyst guide variable has a maximum, is provided. If the catalyst lead is an activity and / or conversion rate, Thus, the SCR catalyst at the extreme value point has a maximum activity.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Ermitteln einer zu der Extremwertstelle gehörenden α-Wertstelle vorgesehen. Es ist erkannt worden, dass die α-Wertstelle vorteilhaft sich unabhängig von einem Alterungszustand weiterer Komponenten der Abgasreinigungsvorrichtung ermitteln lässt. Vorteilhaft kann mittels der α-Wertstelle besonders einfach eine Adaption einer Dosiervorrichtung zum Zudosieren des Reduktionsmittels durchgeführt werden.at Another embodiment of the method is determining one belonging to the extremum point α-value point intended. It has been recognized that the α-value site advantageously independent of an aging condition can determine other components of the emission control device. Advantageously, by means of the α-value point particularly simple an adaptation of a metering device for metering in the reducing agent be performed.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Ermitteln der Extremwertstelle während einer Regenerationsstufe einer Regeneration eines Partikelfilters der Abgasreinigungsvorrichtung und/oder ein Ermitteln der Extremwertstelle unmittelbar vor oder nach der Regeneration vorgesehen. Bei dem Partikelfilter kann es sich beispielsweise um einen Diesel-Partikelfilter handeln, der von Zeit zu Zeit regeneriert werden muss. Vorteilhaft kann eine ohnehin notwendige Anpassung, insbesondere Erhöhung, der Temperatur des Abgasstroms für die Durchführung des Verfahrens mitverwendet werden.at Another embodiment of the method is determining the extreme value point during a regeneration step of a Regeneration of a particulate filter of the exhaust gas purification device and / or determining the extreme value position immediately before or after the Regeneration provided. For example, the particulate filter may be to a diesel particulate filter that regenerates from time to time must become. Advantageously, an adaptation that is necessary anyway, in particular increasing, the temperature of the exhaust stream for the implementation of the method be used.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Einstellen einer Betriebsart des Verbrennungsmotors zum Einstellen der Temperatur, und/oder ein Einstellen der Betriebsart mittels einer innermotorischen Nacheinspritzung eines Kraftstoffs und/oder mittels einer Verschiebung eines Zündzeitpunkts vorgesehen. Bei dem Verbrennungsmotor kann es sich um einen Dieselmotor mit Selbstzündung, einen Benzinmotor mit Fremdzündung oder einen Mischmotor, der Merkmale eines Diesel- und eines Benzinmotors aufweist, handeln. Vorteilhaft kann lediglich mittels der Betriebsart des Verbrennungsmotors die Temperatur eingestellt werden. Weitere Komponenten zum Einstellen der Temperatur können zusätzlich eingesetzt werden, sind jedoch nicht zwingend erforderlich.at Another embodiment of the method is an adjustment an operating mode of the internal combustion engine for adjusting the temperature, and / or a setting of the operating mode by means of an in-engine post-injection of a fuel and / or by means of a shift of an ignition point intended. The internal combustion engine may be a diesel engine with self-ignition, a gasoline engine with spark ignition or a mixed motor, the characteristics of a diesel and a gasoline engine has, act. Advantageously, only by means of the mode the temperature of the internal combustion engine are adjusted. Other components for adjusting the temperature can additionally However, they are not mandatory.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Variieren des α-Werts zwischen 0,5 und 1,5 und/oder ein Variieren des α-Werts in Form einer Rampe und/oder das der NOx-Sensor eine Querempfindlichkeit auf Ammoniak aufweist, vorgesehen. Vorteilhaft lässt sich eine Rampe leicht einstellen. Die Extremwertstelle kann vorab auf α-Werte zwischen 0,5 und 1,5 eingegrenzt werden. Bei α-Werten > 1 ist ein Ammoniakschlupf zu erwarten, der mittels der Querempfindlichkeit des NOx-Sensors ebenfalls detektierbar ist. Vorteilhaft ist jedoch, dass zur Funktionsanpassung lediglich die Extremwertstelle ermittelt wird. Es muss also vorteilhaft nicht aufwändig unterschieden werden, ob es sich um eine Veränderung des zugrunde liegenden Messsignals beziehungsweise NOx-Messwerts des NOx-Sensors aufgrund einer Änderung des NOx-Gehalts des Abgasstroms und/oder eines Ammoniakgehalts des Abgasstroms handelt. Vorteilhaft kann die Katalysator-Leitgröße so ausgelegt sein, dass sowohl eine Erhöhung des NOx-Gehalts als auch eine Erhöhung des Ammoniakgehalts des Abgasstroms, bei angenommen gleichbleibender NOx-Rohemission eine rechnerische Verringerung der Katalysator-Leitgröße bewirkt. Vorteilhaft kann die Katalysator-Leitgröße unabhängig von einer tatsächlichen Aktivität des Katalysators bewertet werden, nämlich lediglich dazu die Extremwertstelle, im vorliegenden Fall das Maximum der Katalysator-Leitgröße, zu ermitteln. Vorteilhaft kann also unabhängig von dem Zustandekommen mittels der NOx- und/oder Ammoniakkonzentration des Abgasstroms die α-Wertstelle ermittelt und als alleinige aussagekräftige Größe für die Funktionsanpassung verwendet werden. Vorteilhaft sind aufgrund der ungefähr zwischen 350°C und 500°C eingestellten Temperatur des Abgasstroms weitere Parameter, wie beispielsweise eine Beladung des SCR-Katalysators, nicht erforderlich. Vorteilhaft weist der SCR-Katalysator zwischen 350°C und 500°C eine vergleichsweise geringe Speicherfähigkeit für NH3 auf. Vorteilhaft hat sich auch gezeigt, das in diesem Temperaturbereich zwar eine alterungsabhängige Erhöhung und/oder Erniedrigung der Katalysator-Leitgröße auftreten kann, wobei jedoch die α-Wertstelle davon nicht oder zumindest nur minimal abhängt.In a further embodiment of the method of varying the α-value between 0.5 and 1.5 and / or varying the α value in the form of a ramp and / or the NO x sensor sensitivity is a cross comprising ammonia, provided , Advantageously, a ramp can be easily adjusted. The extreme value position can be limited in advance to α-values between 0.5 and 1.5. At α values> 1, an ammonia slip is to be expected, which can also be detected by means of the cross-sensitivity of the NO x sensor. It is advantageous, however, that only the extreme value location is determined for functional adaptation. It therefore advantageously does not have to be complicated to distinguish whether it is a change in the underlying measurement signal or NO x measurement value of the NO x sensor due to a change in the NO x content of the exhaust gas flow and / or an ammonia content of the exhaust gas flow. Advantageously, the catalyst control variable can be designed so that both an increase in the NO x content and an increase in the ammonia content of the exhaust gas flow, assuming a constant NO x crude emission causes a mathematical reduction of the catalyst lead. Advantageously, the catalyst guide variable can be evaluated independently of an actual activity of the catalyst, namely only to determine the extreme value point, in this case the maximum of the catalyst guide size. Advantageously, therefore, independently of the occurrence by means of the NO x and / or ammonia concentration of the exhaust gas flow, the α value point can be determined and used as the sole meaningful variable for the functional adaptation. Advantageously, due to the temperature of the exhaust stream, which is set approximately between 350 ° C. and 500 ° C., further parameters, such as, for example, loading of the SCR catalytic converter, are not required. Advantageously, the SCR catalyst between 350 ° C and 500 ° C has a comparatively low storage capacity for NH 3 . Advantageously, it has also been shown that in this temperature range, although an aging-dependent increase and / or reduction of the catalyst lead can occur, but the α-value of it does not or at least minimally depends.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Vergleichen der α-Wertstelle mit einer Referenz-α-Wertstelle, die eine nicht gealterte Referenz-Abgasreinigungsvorrichtung kennzeichnet und/oder ein Durchführen der Funktionsanpassung, so dass nach der Funktionsanpassung der Vergleich einen möglichst kleinen Wert aufweist oder die α-Wertstelle wieder mit der Referenz-α-Wertstelle übereinstimmt vorgesehen. Vorteilhaft kann dadurch die Abgasreinigungsvorrichtung so adaptiert werden, dass sie wieder die Funktionalität oder dieser möglichst nahekommend, der nicht gealterten Abgasreinigungsvorrichtung aufweist.at Another embodiment of the method is a comparison the α-value site with a reference α-value location, which identifies an unaged reference exhaust gas purification device and / or performing the function adjustment so that after the Function adjustment of the comparison as small as possible Has value or the α-value point again coincides with the reference α-value point intended. Advantageously, thereby the exhaust gas purification device be adapted so that they return to functionality or coming as close as possible, the unaged Exhaust gas purification device has.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Durchführen der Funktionsanpassung mittels Anpassen einer Zudosiermenge des Reduktionsmittels vorgesehen. Im Laufe der Alterung der Abgasreinigungsvorrichtung kann es zu Fehldosierungen des Reduktionsmittels kommen. Vorteilhaft kann mittels der Funktionsanpassung eine solche Fehldosierung verhindert oder zumindest auf ein minimales Maß reduziert werden.at Another embodiment of the method is performing the function adjustment by adjusting a dosing of the Reducing agent provided. In the course of aging of the exhaust gas purification device This can lead to incorrect dosages of the reducing agent. Advantageous can prevent such a wrong dosage by means of the function adjustment or at least reduced to a minimum.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Multiplizieren der Zudosiermenge des Reduktionsmittels mit einem Adaptionsfaktor und/oder ein Ermitteln des Adaptionsfaktors mittels des Vergleichs der α-Wertstelle und der Referenz-α-Wertstelle vorgesehen. Vorteilhaft dient als Grundlage der Funktionsanpassung lediglich ein Vergleich von zwei Parametern, aus dem ein Adaptionsfaktor für die Zudosiermenge, beispielsweise mittels eines proportionalen Zusammenhangs, auf einfache Art und Weise herleitbar ist.In a further embodiment of the method, multiplying the metered addition amount of the reducing agent by an adaptation factor and / or determining the adaptation factor by means of the comparison of the α value point and the reference renz α-Wertstelle provided. Advantageously, the basis of the functional adaptation is merely a comparison of two parameters, from which an adaptation factor for the metered quantity, for example by means of a proportional relationship, can be derived in a simple manner.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Ermitteln der NOx-Rohemis-sion mittels eines NOx-Modells und/oder eines dem SCR-Katalysator vorgeschalteten NOx-Sensors vorgesehen. Vorteilhaft kann die NOx-Rohemission entweder gemessen und/oder modellhaft ermittelt werden.In a further embodiment of the method, determination of the NO x crude emission is provided by means of a NO x model and / or an NO x sensor arranged upstream of the SCR catalytic converter. Advantageously, the NO x raw emissions can either be measured and / or modeled.
Bei einer weiteren Ausführungsform des Verfahrens ist ein Einstellen der Temperatur mittels eines der Abgasreinigungsvorrichtung zugeordneten Brenners oder einer externen Heizung vorgesehen. Es ist möglich, dass zur Regeneration des Dieselpartikelfilters und/oder zur Verbesserung eines Anspringverhaltens der Abgasreinigungsvorrichtung ohnehin ein Brenner oder eine externe Heizung vorgesehen ist, der vorteilhaft auch zum Anheben und/oder Einstellen der Temperatur mitverwendet werden kann.at Another embodiment of the method is an adjustment the temperature associated with one of the exhaust gas purification device Brenners or an external heater provided. It is possible, that for the regeneration of the diesel particulate filter and / or for improvement a light-emitting behavior of the exhaust gas purification device anyway a burner or an external heater is provided which is advantageous also used for lifting and / or adjusting the temperature can be.
Die Aufgabe ist außerdem bei einer Antriebsanordnung eines Kraftfahrzeuges, mit einem Verbrennungsmotor, einer dem Verbrennungsmotor nachgeschalteten Abgasreinigungsvorrichtung zum Reinigen eines Abgasstroms des Verbrennungsmotors mittels einer selektiven katalytischen Reduktion, eingerichtet, ausgelegt und/oder konstruieren zum Durchführen eines vorab beschriebenen Verfahrens gelöst. Insbesondere ergeben sich die vorab beschriebenen Vorteile.The Task is also in a drive arrangement of a Motor vehicle, with an internal combustion engine, a downstream of the engine An exhaust gas purification device for purifying an exhaust gas flow of the internal combustion engine by means of a selective catalytic reduction, set up, designed and / or constructed to perform a preliminary solved described method. In particular, arise the advantages described above.
Weitere Vorteile, Merkmale und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezug auf die Zeichnung ein Ausführungsbeispiel im Einzelnen beschrieben ist. Gleiche, ähnliche und/oder funktionsgleiche Teile sind mit gleichen Bezugszeichen versehen. Es zeigen:Further Advantages, features and details emerge from the following Description, in reference to the drawing, an embodiment is described in detail. Same, similar and / or functionally identical parts are provided with the same reference numerals. Show it:
Dem
SCR-Katalysator
Stromabwärts
des Verbrennungsmotors
Stromabwärts
des Verbrennungsmotors
Für
die in
Anhand
der
Vorteilhaft
kann die α-Wertstelle
Die
Durchführung des Verfahrens beziehungsweise eine Funktionsüberprüfung
beziehungsweise Funktionsanpassung kann an eine Motorbetriebsart
zur Konstanthaltung der Temperatur
Vorteilhaft
sind bei der konstant eingestellten, insbesondere in einem Mittel,
Temperatur
Zum
Durchführen der Funktionsanpassung beziehungsweise Funktionsüberprüfung
wird das α beziehungsweise der α-Wert
Vorteilhaft
ergibt sich insgesamt eine robuste Möglichkeit, Veränderungen,
zum Beispiel der Dosiervorrichtung
Außerdem
kann vorteilhaft auf eine aufwändige Detektion eines NH3-Schlupfes verzichtet werden, da die α-Wertstelle
- 11
- Abgasreinigungsvorrichtungexhaust gas purification device
- 33
- Abgasstromexhaust gas flow
- 55
- Verbrennungsmotorinternal combustion engine
- 77
- Kraftfahrzeugmotor vehicle
- 99
- SCR-KatalysatorSCR catalyst
- 1111
- Reduktionsmittelreducing agent
- 1313
- Dosiervorrichtungmetering
- 1515
- NOX-SensorNOX sensor
- 1717
- NOX-MesswertNOX reading
- 1919
- Steuereinheitcontrol unit
- 2121
- Steuersignalcontrol signal
- 2323
- NOX-RohemissionssensorNOx raw emission sensor
- 2525
- NOX-RohemissionsmesswertNOX raw emissions measurement
- 2727
- Verbindungconnection
- 2929
- Oxidationskatalysatoroxidation catalyst
- 3131
- Dieselpartikelfilterdiesel particulate Filter
- 3333
- Brennerburner
- 3535
- Kraftstofffuel
- 3737
- Variationvariation
- 3939
- α-Wertα-value
- 4141
- x-AchseX axis
- 4343
- erste y-Achsefirst y-axis
- 4545
- zweite y-Achsesecond y-axis
- 4747
- Ramperamp
- 4949
- Minimumminimum
- 5151
- Katalysator-LeitgrößeCatalyst-guide variable
- 5353
- x-AchseX axis
- 5555
- y-Achsey-axis
- 5757
- ExtremwertstelleExtreme value point
- 5959
- Extremwertextreme value
- 6161
- α-Wertstelleα-value point
- 6363
- Temperaturtemperature
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 102005062120 A1 [0002] DE 102005062120 A1 [0002]
- - DE 102007006489 A1 [0002] - DE 102007006489 A1 [0002]
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