DE102011086426A1 - Dosing module, particularly for metering reducing agent in exhaust pipe of internal combustion engine, has dosing valve surrounded in partial area of cooling body guiding cooling liquid, where cooling body has connecting pieces - Google Patents
Dosing module, particularly for metering reducing agent in exhaust pipe of internal combustion engine, has dosing valve surrounded in partial area of cooling body guiding cooling liquid, where cooling body has connecting pieces Download PDFInfo
- Publication number
- DE102011086426A1 DE102011086426A1 DE102011086426A DE102011086426A DE102011086426A1 DE 102011086426 A1 DE102011086426 A1 DE 102011086426A1 DE 102011086426 A DE102011086426 A DE 102011086426A DE 102011086426 A DE102011086426 A DE 102011086426A DE 102011086426 A1 DE102011086426 A1 DE 102011086426A1
- Authority
- DE
- Germany
- Prior art keywords
- heat sink
- cooling liquid
- cooling body
- flow
- metering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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]
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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
- F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
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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
Abstract
Description
Die vorliegende Erfindung betrifft ein Dosiermodul, insbesondere zur Eindosierung eines Reduktionsmittels in ein Abgasrohr einer Brennkraftmaschine, wobei das Dosiermodul zumindest in einem Teilbereich von einem eine Kühlflüssigkeit führenden Kühlkörper umgebenes Dosierventil aufweist und wobei der Kühlkörper mit Anschlussstutzen zur Zuführung und Abführung von Kühlflüssigkeit versehen ist. Weiterhin betrifft die Erfindung ein Verfahren zur Auslegung eines solchen Dosiermoduls.The present invention relates to a dosing module, in particular for dosing a reducing agent in an exhaust pipe of an internal combustion engine, wherein the dosing at least in a partial region of a coolant carrying a cooling body surrounded metering valve and wherein the heat sink is provided with connecting pieces for supplying and discharging cooling liquid. Furthermore, the invention relates to a method for designing such a metering module.
Stand der TechnikState of the art
Ein derartiges Dosiermodul ist aus der
Offenbarung der ErfindungDisclosure of the invention
Der Erfindung liegt die Aufgabe zugrunde, ein Dosiermodul bereitzustellen, bei dem die Kühlung durch eine Kühlflüssigkeit verbessert, insbesondere vergleichmäßigt ist.The invention has for its object to provide a metering module, wherein the cooling is improved by a cooling liquid, in particular equalized.
Diese Aufgabe wird dadurch gelöst, dass der Kühlkörper im Bereich unterhalb und zwischen den Anschlussstutzen eine Strömungsleiteinrichtung aufweist, die eine Vergleichmäßigung der Strömung der Kühlflüssigkeit durch den Kühlkörper bewirkt. Das entsprechende Verfahren zur Auslegung eines Dosiermodul sieht vor, dass in dem Kühlkörper eine durch eine Querschnittsverringerung bewirkte Strömungsleitung so erfolgt, dass zumindest ein totwassergefährdeter Bereich des Kühlkörpers von Kühlflüssigkeit durchströmt wird. Grundlage dieser Ausgestaltung bzw. des Verfahrens zur Auslegung ist die Analyse eines Kühlkörpers ohne entsprechende Strömungsleiteinrichtung und die Feststellung von möglichen Totwassergebieten, in denen die Kühlflüssigkeit nicht ausreichend bewegt wird. Ein solches Totwassergebiet kann durch beispielsweise einen Kurzschlusspfad gebildet werden, durch den die zugeführte Kühlflüssigkeit auf einfachem Weg den Kühlkörper durchströmt und durch einen Anschlussstutzen wieder verlässt. Die gegenüberliegende Seite zu einem solchen Kurzschlusspfad wird beispielsweise wenig von Kühlflüssigkeit durchströmt.This object is achieved in that the heat sink in the region below and between the connecting piece has a flow guide, which causes a homogenization of the flow of the cooling liquid through the heat sink. The corresponding method for designing a metering module provides that in the heat sink caused by a cross-sectional reduction flow line so that at least one dead-water hazardous area of the heat sink is flowed through by cooling liquid. The basis of this embodiment and the method of interpretation is the analysis of a heat sink without appropriate flow guide and the detection of possible dead water areas in which the cooling liquid is not sufficiently moved. Such a dead water area can be formed by, for example, a short-circuit path through which the supplied cooling liquid flows through the heat sink in a simple way and leaves again through a connecting piece. The opposite side to such a short circuit path, for example, flows through little of coolant.
In Weiterbildung der Erfindung ist die Strömungsleiteinrichtung eine Querschnittsverringerung in dem Kühlkörper zwischen den Anschlussstutzen, die wiederum in weiterer Ausgestaltung bevorzugt durch eine Einbuchtung in den Kühlkörper gebildet ist. Diese Einbuchtung, die sich auch aus mehreren Einzeleinbuchtungen zusammensetzen kann, ist so angeordnet, dass ein Strömungspfad in einen oder mehreren totwassergefährdeten Bereichen des Kühlkörpers generiert wird. Anstelle der Einbuchtung kann der Kühlkörper auch exzentrisch zu dem Dosierventil angeordnet sein. Weiterhin kann in dem Kühlkörper auch zumindest eine Hülse angeordnet sein, die exzentrisch zu dem Kühlkörper und/oder dem Dosierventil angeordnet ist. Auch durch diese Ausgestaltungen wird die gewünschte Strömungsbeeinflussung erreicht.In a development of the invention, the flow-guiding device is a cross-sectional reduction in the heat sink between the connecting pieces, which in turn is preferably formed by a recess in the heat sink in a further embodiment. This indentation, which can also be composed of several individual indentations, is arranged so that a flow path is generated in one or more areas of the heat sink that are prone to dead water. Instead of the indentation, the heat sink may also be arranged eccentrically to the metering valve. Furthermore, at least one sleeve can be arranged in the heat sink, which is arranged eccentrically to the heat sink and / or the metering valve. Also by these embodiments, the desired flow influencing is achieved.
Gemäß einem weiteren Verfahren zur Auslegung eines solchen Dosiermoduls bzw. der Strömungsleiteinrichtung wird der Kühlkörper gleichmäßig von Kühlflüssigkeit durchströmt. Dies kann beispielsweise durch eine sich ändernde Ausbildung der Strömungsleiteinrichtung entlang des Kühlkörpers erreicht sein, die beispielsweise durch eine sich ändernde Höhe der Einbuchtung gebildet wird.According to a further method for designing such a dosing module or the flow-guiding device, the cooling body is uniformly flowed through by cooling liquid. This can be achieved, for example, by a changing design of the flow guide along the heat sink, which is formed for example by a changing height of the indentation.
Vorteilhafte Weiterbildungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in den Figuren dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist.Advantageous developments of the invention are described in the drawings, in which an illustrated in the figures embodiment of the invention is described in detail.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Es zeigen:Show it:
Ausführungsform der ErfindungEmbodiment of the invention
Mit Hilfe des Dosiermoduls wird – wie ausgeführt – ein Reduktionsmittel, beispielsweise Harnstoff, in das Abgasrohr der Brennkraftmaschine eingespritzt, wobei das Reduktionsmittel in einem nachfolgenden Katalysator gewünschte chemische Reaktionen auslöst. Da das Abgasrohr durch die heißen Verbrennungsgase der Brennkraftmaschine stark erwärmt wird, muss das in das Abgasrohr hineinragende Dosiermodul zumindest teilweise gekühlt werden, um unzulässige Temperaturen von Komponenten des Dosiermoduls abzuhalten und eine Verdampfung des Reduktionsmittels in dem Dosierventil zu vermeiden.With the aid of the dosing module, as has been stated, a reducing agent, for example urea, is injected into the exhaust pipe of the internal combustion engine, wherein the reducing agent triggers desired chemical reactions in a subsequent catalyst. Since the exhaust pipe is strongly heated by the hot combustion gases of the internal combustion engine, the dosing module projecting into the exhaust pipe must be at least partially cooled in order to prevent inadmissible temperatures of components of the dosing and to avoid evaporation of the reducing agent in the metering valve.
Der Kühlkörper
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES 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 of the documents listed by the applicant has been 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 PatentliteraturCited patent literature
- DE 102009047375 A1 [0002] DE 102009047375 A1 [0002]
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102011086426A DE102011086426A1 (en) | 2011-11-16 | 2011-11-16 | Dosing module, particularly for metering reducing agent in exhaust pipe of internal combustion engine, has dosing valve surrounded in partial area of cooling body guiding cooling liquid, where cooling body has connecting pieces |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011086426A DE102011086426A1 (en) | 2011-11-16 | 2011-11-16 | Dosing module, particularly for metering reducing agent in exhaust pipe of internal combustion engine, has dosing valve surrounded in partial area of cooling body guiding cooling liquid, where cooling body has connecting pieces |
Publications (1)
Publication Number | Publication Date |
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DE102011086426A1 true DE102011086426A1 (en) | 2013-05-16 |
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Family Applications (1)
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DE102011086426A Withdrawn DE102011086426A1 (en) | 2011-11-16 | 2011-11-16 | Dosing module, particularly for metering reducing agent in exhaust pipe of internal combustion engine, has dosing valve surrounded in partial area of cooling body guiding cooling liquid, where cooling body has connecting pieces |
Country Status (1)
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DE (1) | DE102011086426A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009047375A1 (en) | 2009-12-02 | 2011-06-09 | Robert Bosch Gmbh | Device for cooling dosing module, particularly for feeding reducing agent into exhaust tract of internal combustion engine, comprises dosing module, which is assigned cooling unit, by which coolant is flowed through |
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2011
- 2011-11-16 DE DE102011086426A patent/DE102011086426A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009047375A1 (en) | 2009-12-02 | 2011-06-09 | Robert Bosch Gmbh | Device for cooling dosing module, particularly for feeding reducing agent into exhaust tract of internal combustion engine, comprises dosing module, which is assigned cooling unit, by which coolant is flowed through |
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R012 | Request for examination validly filed | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |