DE102019215603A1 - Method for operating a delivery and metering system for the reducing agent solution of at least one SCR catalytic converter - Google Patents
Method for operating a delivery and metering system for the reducing agent solution of at least one SCR catalytic converter Download PDFInfo
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- DE102019215603A1 DE102019215603A1 DE102019215603.7A DE102019215603A DE102019215603A1 DE 102019215603 A1 DE102019215603 A1 DE 102019215603A1 DE 102019215603 A DE102019215603 A DE 102019215603A DE 102019215603 A1 DE102019215603 A1 DE 102019215603A1
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- delivery
- metering
- reducing agent
- metering system
- metering valves
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
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- 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
-
- 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
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- 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)
- Exhaust Gas After Treatment (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zum Betreiben eines Förder- und Dosiersystems für die Reduktionsmittellösung mindestens eines SCR-Katalysators eines Verbrennungsmotors, wobei das Förder- und Dosiersystem wenigstens eine Förderpumpe, wenigstens eine Rücksaugpumpe, eine hydraulische Versorgungsleitung und mehrere mit der hydraulischen Versorgungsleitung verbundene Dosierventile umfasst. Nach dem Abstellen des Verbrennungsmotors erfolgt ein Rücksaugen (82) des Reduktionsmittels zumindest aus Teilen des Förder- und Dosiersystems, während die Dosierventile geschlossen sind. Anschließend werden alle Dosierventile gleichzeitig geöffnet (84).The invention relates to a method for operating a delivery and metering system for the reducing agent solution of at least one SCR catalytic converter of an internal combustion engine, the delivery and metering system comprising at least one feed pump, at least one suction pump, a hydraulic supply line and several metering valves connected to the hydraulic supply line. After the internal combustion engine has been switched off, the reducing agent is sucked back (82) from at least parts of the delivery and metering system while the metering valves are closed. All metering valves are then opened at the same time (84).
Description
Die vorliegende Erfindung betrifft ein Verfahren zum Betreiben eines Förder- und Dosiersystems für die Reduktionsmittellösung mindestens eines SCR-Katalysators eines Verbrennungsmotors. Des Weiteren betrifft die vorliegende Erfindung ein Computerprogramm, das jeden Schritt des Verfahrens ausführt, sowie ein maschinenlesbares Speichermedium, welches das Computerprogramm speichert. Schließlich betrifft die Erfindung ein elektronisches Steuergerät, welches eingerichtet ist, um das Verfahren auszuführen.The present invention relates to a method for operating a delivery and metering system for the reducing agent solution of at least one SCR catalytic converter of an internal combustion engine. The present invention also relates to a computer program that executes each step of the method, as well as a machine-readable storage medium that stores the computer program. Finally, the invention relates to an electronic control device which is set up to carry out the method.
Stand der TechnikState of the art
Um den Anteil von Stickoxiden im Abgas eines Verbrennungsmotors, insbesondere eines Dieselmotors zu verringern, ist es bekannt in seinem Abgasstrang einen SCR-Katalysator (selective catalytic reduction) anzuordnen. Dieser reduziert die im Abgas enthaltenden Stickoxide in Gegenwart von Ammoniak als Reduktionsmittel zu Stickstoff. Um das Ammoniak bereitzustellen, wird stromaufwärts des SCR-Katalysators eine Reduktionsmittellösung in den Abgasstrang eindosiert. In der Regel wird hierfür eine wässrige Harnstofflösung (Harnstoff-Wasser-Lösung; HWL) verwendet, die Harnstoff als Ammoniak abspaltendes Reagenz enthält. Eine 32,5 %ige HWL ist unter der Bezeichnung AdBlue® kommerziell erhältlich. Diese gefriert bei einer Temperatur von - 11,5°C.In order to reduce the proportion of nitrogen oxides in the exhaust gas of an internal combustion engine, in particular a diesel engine, it is known to arrange an SCR (selective catalytic reduction) catalytic converter in its exhaust line. This reduces the nitrogen oxides contained in the exhaust gas in the presence of ammonia as a reducing agent to nitrogen. In order to provide the ammonia, a reducing agent solution is metered into the exhaust system upstream of the SCR catalytic converter. As a rule, an aqueous urea solution (urea-water solution; HWL) containing urea as an ammonia-releasing reagent is used for this. A 32.5% HWL is commercially available under the name AdBlue ®. This freezes at a temperature of - 11.5 ° C.
SCR-Dosiersystemen werden beim Abstellen des Verbrennungsmotors durch Rücksaugen entleert bzw. belüftet, um das Dosierventil und die Druckleitung vor Schäden durch Eisdruck beim Einfrieren zu bewahren. Im Dosierbetrieb steht das System durch das Betreiben einer Förderpumpe unter Druck. Nach Abstellen des Verbrennungsmotors erfolgt ein Abbau des Systemdrucks durch Anhalten der Förderpumpe und gegebenenfalls das Öffnen eines Druckabbauventils oder einer Rückförderpumpe. Durch Entleeren bei geschlossenem Dosierventil mittels der Rückförderpumpe wird ein Unterdruck im System erzeugt. Dann wird das Dosierventil bei fortwährendem Entleeren des Systems geöffnet. Hierdurch erfolgt ein plötzliches Ansaugen von Luft am Dosierventil. Der Entleervorgang wird fortgeführt, bis sich der Unterdruck im System stabilisiert hat.When the combustion engine is switched off, SCR metering systems are emptied or ventilated by sucking back in order to protect the metering valve and the pressure line from damage caused by ice pressure when freezing. In the dosing mode, the system is under pressure through the operation of a feed pump. After the internal combustion engine has been switched off, the system pressure is reduced by stopping the feed pump and, if necessary, opening a pressure reduction valve or a return pump. A vacuum is created in the system by emptying with the dosing valve closed by means of the return pump. Then the metering valve is opened while the system is continuously being emptied. This causes a sudden suction of air at the metering valve. The emptying process continues until the negative pressure in the system has stabilized.
Ein Dosiersystem für ein flüssiges Reduktionsmittel, das mittels einer Rückförderpumpe entleert werden kann wird in der
Offenbarung der ErfindungDisclosure of the invention
Das Verfahren dient zum Betreiben eines Förder- und Dosiersystems für die Reduktionsmittellösung mindestens eines SCR-Katalysators eines Verbrennungsmotors, wobei das Förder- und Dosiersystem wenigstens eine Förderpumpe, wenigstens eine Rücksaugpumpe, eine hydraulische Versorgungsleitung und mehrere, insbesondere zwei, mit der hydraulischen Versorgungsleitung verbundene Dosierventile umfasst. Dabei können die Förderpumpe und die Rückförderpume auch durch eine einzige Pumpe realisiert werden, die mit unterschiedlichen Förderrichtungen betrieben werden kann. Ein derartiges Dosiersystem kann beispielsweise für ein SCR-Katalysatorsystem mit zwei SCR-Katalysatoren vorgesehen sein, wobei das erste Dosierventil stromaufwärts des ersten SCR-Katalysators im Abgasstrang angeordnet ist und das zweite Dosiersystem zwischen den SCR-Katalysatoren angeordnet ist.The method is used to operate a delivery and metering system for the reducing agent solution of at least one SCR catalyst of an internal combustion engine, the delivery and metering system having at least one feed pump, at least one suction pump, a hydraulic supply line and several, in particular two, metering valves connected to the hydraulic supply line includes. The feed pump and the return pump can also be implemented by a single pump that can be operated with different conveying directions. Such a metering system can be provided, for example, for an SCR catalytic converter system with two SCR catalytic converters, the first metering valve being arranged upstream of the first SCR catalytic converter in the exhaust system and the second metering system being arranged between the SCR catalytic converters.
Nach dem Abstellen des Verbrennungsmotors erfolgt ein Rücksaugen des Reduktionsmittels zumindest aus Teilen des Förder- und Dosiersystems, während die Dosierventile geschlossen sind. Anschließend werden alle Dosierventile gleichzeitig geöffnet.After the internal combustion engine has been switched off, the reducing agent is sucked back from at least parts of the delivery and metering system while the metering valves are closed. Then all dosing valves are opened at the same time.
Durch den Aufbau eines Unterdrucks vor dem Öffnen der Dosierventile kann eine unbeabsichtigte Dosierung von geringen Mengen der Reduktionsmittellösung während des Rücksaugvorganges verhindert werden. Die Dosierventile werden nur geöffnet, wenn an ihnen ein Unterdruck anliegt. Des Weiteren erfolgt der Entleervorgang der Dosierventile auf diese Weise sehr plötzlich. Die Entleerung findet dynamisch besser statt, als wenn bei schon geöffneten Dosierventilen die Rückförderung gestartet würde, da weniger Reduktionsmittellösung im Dosierventil verbleibt. Indem alle Dosierventile gleichzeitig geöffnet werden, wird vermieden, dass durch die vorzeitige Öffnung eines Dosierventils bereits ein Abbau des Unterdrucks stattfindet, so dass der Entleervorgang der weiteren Dosierventile verzögert würde.By building up a negative pressure before opening the metering valves, unintentional metering of small amounts of the reducing agent solution during the sucking back process can be prevented. The metering valves are only opened when there is a negative pressure on them. Furthermore, the emptying process of the dosing valves takes place very suddenly in this way. The emptying takes place dynamically better than if the return feed were started with the metering valves already open, since less reducing agent solution remains in the metering valve. By opening all of the metering valves at the same time, the premature opening of a metering valve prevents the negative pressure from being reduced, so that the emptying process of the other metering valves would be delayed.
Die Dosierventile werden bevorzugt erst dann geöffnet, wenn ein Unterdruck in dem Förder- und Dosiersystem zumindest 5000 Pascal beträgt. Besonders bevorzugt werden sie erst dann geöffnet, wenn der Unterdruck zumindest 15000 Pascal beträgt. Hierdurch wird sichergestellt, dass der Entleervorgang der Dosierventile so plötzlich erfolgt, dass keine Reduktionsmittellösung ungewollt in den Abgasstrang gelangen kann. Unter dem Unterdruck wird hierbei kein Absolutwert des Druckes sondern ein relativer Unterdruck in Bezug auf den Umgebungsdruck verstanden.The metering valves are preferably only opened when a negative pressure in the delivery and metering system is at least 5000 Pascal. They are particularly preferably only opened when the negative pressure is at least 15,000 Pascal. This ensures that the metering valves are emptied so suddenly that no reducing agent solution can unintentionally get into the exhaust system. In this context, the negative pressure is not understood to mean an absolute value of the pressure but rather a relative negative pressure in relation to the ambient pressure.
Wenn kein Drucksensor vorhanden ist, um den Druck in der hydraulischen Versorgungsleitung zu messen, ist es stattdessen bevorzugt, dass die Dosierventile nach einem vorgebbaren Zeitraum geöffnet werden. Dieser Zeitraum liegt bevorzugt im Bereich von 5 Sekunden bis 10 Sekunden.If there is no pressure sensor to measure the pressure in the hydraulic supply line, it is preferred instead that the metering valves are opened after a predeterminable period of time. This period of time is preferably in the range from 5 seconds to 10 seconds.
Das Rücksaugen des Reduktionsmittels wird vorzugsweise fortgesetzt, nachdem die Dosierventile geöffnet wurden. Dadurch kann aus den zu den Dosierventilen führenden Abschnitten der hydraulischen Versorgungsleitung weiteres Volumen der Reduktionsmittellösung entnommen werden. Dies führt zu einer erhöhten Robustheit gegenüber Umlagerungen von Reduktionsmittellösung in der hydraulischen Versorgungsleitung, welche bei tiefen Temperaturen Eisdruck verursachen könnten.The sucking back of the reducing agent is preferably continued after the metering valves have been opened. As a result, further volume of the reducing agent solution can be taken from the sections of the hydraulic supply line leading to the metering valves. This leads to increased robustness against rearrangements of reducing agent solution in the hydraulic supply line, which could cause ice pressure at low temperatures.
Das Rücksaugen bei geöffneten Dosierventilen wird vorzugsweise maximal für einen vorgebbaren Zeitraum durchgeführt. Hierdurch wird ein zu großer Lufteintrag in die hydraulische Versorgungsleitung verhindert. Der vorgebare Zeitraum beträgt bevorzugt maximal 2 Sekunden, besonders bevorzugt maximal 1 Sekunde.The sucking back when the metering valves are open is preferably carried out for a predeterminable period of time. This prevents excessive air entry into the hydraulic supply line. The predeterminable period of time is preferably a maximum of 2 seconds, particularly preferably a maximum of 1 second.
Das Computerprogramm ist eingerichtet jeden Schritt des Verfahrens durchzuführen, insbesondere wenn es auf einem Rechengerät oder auf einem elektronischen Steuergerät abläuft. Es ermöglicht die Implementierung unterschiedlicher Ausführungsformen des Verfahrens auf einem elektronischen Steuergerät ohne hieran bauliche Veränderungen vornehmen zu müssen. Hierzu ist es auf dem maschinenlesbaren Speichermedium gespeichert.The computer program is set up to carry out each step of the method, in particular when it runs on a computing device or on an electronic control device. It enables the implementation of different embodiments of the method on an electronic control device without having to make structural changes to it. For this purpose, it is stored on the machine-readable storage medium.
Durch Aufspielen des Computerprogramms auf ein herkömmliches elektronisches Steuergerät, wird das elektronische Steuergerät erhalten, welches eingerichtet ist, um mittels des Verfahrens ein Förder- und Dosiersystem für die Reduktionsmittellösung mindestens eines SCR-Katalysators zu betreiben.By uploading the computer program to a conventional electronic control device, the electronic control device is obtained, which is set up to operate a delivery and metering system for the reducing agent solution of at least one SCR catalytic converter by means of the method.
FigurenlisteFigure list
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird in der nachfolgenden Beschreibung näher erläutert.
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1 zeigt schematisch Komponenten eines Förder- und Dosiersystems für die Reduktionsmittellösung eines SCR-Katalysators welches mittels eines Ausführungsbeispiels des erfindungsgemäßen Verfahrens betrieben werden kann. -
2 zeigt ein Ablaufdiagramm eines Ausführungsbeispiels des erfindungsgemäßen Verfahrens.
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1 shows schematically components of a delivery and metering system for the reducing agent solution of an SCR catalytic converter which can be operated by means of an exemplary embodiment of the method according to the invention. -
2 shows a flow chart of an embodiment of the method according to the invention.
Ausführungsbeispiel der ErfindungEmbodiment of the invention
Stromaufwärts des Ansaugventils
Nach dem Abstellen des Verbrennungsmotors wird die Reduktionsmittellösung mithilfe der Rücksaugpumpe
Ein zweites Ausführungsbeispiel der Erfindung unterscheidet sich von dem ersten Ausführungsbeispiel darin, dass bei der zweiten Prüfung
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDED 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 of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturPatent literature cited
- DE 102011081628 A1 [0004]DE 102011081628 A1 [0004]
Claims (10)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE102019215603.7A DE102019215603A1 (en) | 2019-10-11 | 2019-10-11 | Method for operating a delivery and metering system for the reducing agent solution of at least one SCR catalytic converter |
KR1020200129142A KR20210044155A (en) | 2019-10-11 | 2020-10-07 | Method for operating a feeding and dosing system for the reducing agent solution of at least one scr-catalytic converter |
CN202011070648.8A CN112648053A (en) | 2019-10-11 | 2020-10-09 | Method for operating a system for delivering and metering a reducing agent solution to at least one SCR catalyst |
Applications Claiming Priority (1)
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DE102019215603.7A DE102019215603A1 (en) | 2019-10-11 | 2019-10-11 | Method for operating a delivery and metering system for the reducing agent solution of at least one SCR catalytic converter |
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DE102019215603A1 true DE102019215603A1 (en) | 2021-04-15 |
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DE102019215603.7A Pending DE102019215603A1 (en) | 2019-10-11 | 2019-10-11 | Method for operating a delivery and metering system for the reducing agent solution of at least one SCR catalytic converter |
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KR (1) | KR20210044155A (en) |
CN (1) | CN112648053A (en) |
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Citations (4)
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DE102010031660A1 (en) * | 2010-07-22 | 2012-01-26 | Robert Bosch Gmbh | Method for operating dosing system for selective catalytic reduction catalyst converter of combustion engine of e.g. car, involves opening relief valve and dosing module after termination of dosing process |
DE102012212564A1 (en) * | 2012-07-18 | 2014-01-23 | Robert Bosch Gmbh | Method for operating conveyor and dosing system, involves mixing medium with return flow path by feed pump during the return conveyance of medium from the pressure-side portion of the system out of the medium reservoir |
DE102016210262A1 (en) * | 2016-06-10 | 2017-12-14 | Robert Bosch Gmbh | A method of emptying a reductant delivery system of an SCR catalyst |
DE102016218497A1 (en) * | 2016-09-27 | 2018-03-29 | Robert Bosch Gmbh | Reductant supply system for exhaust aftertreatment |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102004054238A1 (en) * | 2004-11-10 | 2006-05-11 | Robert Bosch Gmbh | Dosing system and method for operating a dosing system |
DE102009029408B4 (en) * | 2009-09-14 | 2023-10-19 | Robert Bosch Gmbh | Method for monitoring the function of an SCR catalyst system |
DE102011088221A1 (en) * | 2011-12-12 | 2013-06-13 | Robert Bosch Gmbh | Dosing arrangement for a liquid exhaust aftertreatment agent and dosing |
DE102016217842A1 (en) * | 2016-09-19 | 2018-03-22 | Robert Bosch Gmbh | Method for operating a Hubmagnetankerpumpe for return promotion in a discharge phase |
DE102017204972A1 (en) * | 2017-03-24 | 2018-09-27 | Robert Bosch Gmbh | Method for controlling an SCR system with two metering valves |
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2019
- 2019-10-11 DE DE102019215603.7A patent/DE102019215603A1/en active Pending
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2020
- 2020-10-07 KR KR1020200129142A patent/KR20210044155A/en active Search and Examination
- 2020-10-09 CN CN202011070648.8A patent/CN112648053A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102010031660A1 (en) * | 2010-07-22 | 2012-01-26 | Robert Bosch Gmbh | Method for operating dosing system for selective catalytic reduction catalyst converter of combustion engine of e.g. car, involves opening relief valve and dosing module after termination of dosing process |
DE102012212564A1 (en) * | 2012-07-18 | 2014-01-23 | Robert Bosch Gmbh | Method for operating conveyor and dosing system, involves mixing medium with return flow path by feed pump during the return conveyance of medium from the pressure-side portion of the system out of the medium reservoir |
DE102016210262A1 (en) * | 2016-06-10 | 2017-12-14 | Robert Bosch Gmbh | A method of emptying a reductant delivery system of an SCR catalyst |
DE102016218497A1 (en) * | 2016-09-27 | 2018-03-29 | Robert Bosch Gmbh | Reductant supply system for exhaust aftertreatment |
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CN112648053A (en) | 2021-04-13 |
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