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EP2010767A1 - Method and device for preventing the freezing of a liquid reduction agent for treating the exhaust gas of an internal combustion engine - Google Patents

Method and device for preventing the freezing of a liquid reduction agent for treating the exhaust gas of an internal combustion engine

Info

Publication number
EP2010767A1
EP2010767A1 EP07726520A EP07726520A EP2010767A1 EP 2010767 A1 EP2010767 A1 EP 2010767A1 EP 07726520 A EP07726520 A EP 07726520A EP 07726520 A EP07726520 A EP 07726520A EP 2010767 A1 EP2010767 A1 EP 2010767A1
Authority
EP
European Patent Office
Prior art keywords
reducing agent
internal combustion
combustion engine
exhaust gas
reduction agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07726520A
Other languages
German (de)
French (fr)
Inventor
Waldemar Behrendt
Christof Kirsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ContiTech Techno Chemie GmbH
Original Assignee
ContiTech Techno Chemie GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ContiTech Techno Chemie GmbH filed Critical ContiTech Techno Chemie GmbH
Publication of EP2010767A1 publication Critical patent/EP2010767A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold
    • 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

Definitions

  • the invention relates to a device and a method for heating a reducing agent system for an exhaust gas treatment system of an internal combustion engine according to the features of patent claims 1 and 2.
  • aqueous urea solution is used, which is carried in a separate reservoir.
  • the entrained in the vehicle reducing agent is supplied from the separate reducing agent tank via a pump to a metering module, from which it is injected into the exhaust stream upstream of the catalyst.
  • Storage tank, pump and metering module are connected to each other via hose lines, via which the reducing agent representing an aqueous solution, such as a urea solution, is conveyed.
  • aqueous solutions such as a urea solution
  • a disadvantage of these aqueous solutions is that depending on the concentration of the dissolved substance, the risk of freezing from about H 0 C consists. It is known to heat the reservoir and the supply lines by means of an electric heater to minimize the risk of freezing.
  • the invention has for its object to avoid the freezing of the guided in the connecting lines via the feed pump to the metering liquid reducing agent safely and with less effort.
  • the heating water circuit branched off from the cooling water circuit of the internal combustion engine is circulated through the entire reducing agent system. He goes in close heat donating neighborhood to the aggregates or apparatuses of the reducing agent system connecting hose lines, which is made possible for example by a close common, running under contact laying of the lines. The units or appliances themselves and the connection connections of the hose lines are flowed through by the closed Edelwassernikank.
  • the heating water circuit branched off from the cooling water circuit, not shown here, of the internal combustion engine has a water pump 2, from which the heating water is led via a hose line 3 to a connection block 4 of a conveyor module 5.
  • the heating water flows through the connection block 4 and is led from there via a further hose line 6 to a connection block 7 on the storage medium container 8, which also flows through the heating water and leaves radially again. From there, the heating water is passed to a heat exchanger 9 located inside the storage container 8. After passing through the heat exchanger 9, the heating water is led via a further hose 11 to a further connection block 12 of the reservoir 8, flows through this and is passed via a hose 13 to a connection block 14 on the conveyor module 5.
  • connection block 14 After flowing through this connection block 14, the heating water is passed to a further connection block 15 of the conveyor module 8, flows through this and is guided to a connection block 16 of a dosing 17 via a further hose 18. After flowing through this connection block 16, the heating water is fed back to the cooling circuit of the internal combustion engine.
  • the conveying path of the urea solution taken from the reservoir 8 is shown by the dashed line. It is via the terminal block 7 and a
  • the delivery module 5 ensures a further delivery of a certain amount of urea solution via the connection block 15 and a hose 22 to the dosing 17, from which the urea solution dosed into the exhaust stream before the SCR catalyst not shown here by means of a line 20 from the conveyor module 5 supplied compressed air is injected.
  • the excess amount of urea solution will returned via the terminal block 14 and a hose 23 to the reservoir 8 via its terminal block 12.
  • the hose lines 21, 22, 23 of the urea solution and the hose lines 6, 13, 18 of the heating water run between the apparatuses 5, 8 and 17 in close heat-emitting neighborhood, which can be realized for example by a common laying of the hose lines as pairs.
  • the flowing through the heating water through the terminal blocks 4,7, 12, 14, 15 and 16 results in a sufficient temperature of the terminal blocks, so that these and the equipment are sufficiently heated.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The reduction agent unit of an exhaust gas treatment system in an internal combustion engine is heated by a heating water circuit (1) that branches off from the coolant circuit. The heating water is conducted through the components (5, 8, 17) of the reduction agent unit in close heat-diffusing proximity to the reduction agent hose lines (21, 22, 23).

Description

Beschreibungdescription

Verfahren und Vorrichtung zum Schutz des Einfrierens eines flüssigen Reduktionsmittels für die Abgasnachbehandlung einer BrennkraftmaschineMethod and device for protecting the freezing of a liquid reducing agent for the exhaust aftertreatment of an internal combustion engine

Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum Beheizen einer Reduktionsmittelanlage für ein Abgasbehandlungssystem einer Brennkraftmaschine gemäß den Merkmalen der Patentansprüche 1 und 2.The invention relates to a device and a method for heating a reducing agent system for an exhaust gas treatment system of an internal combustion engine according to the features of patent claims 1 and 2.

Zur Verminderung von Stickoxidemissionen einer Brennkraftmaschine ist es bekannt, mit Hilfe der Selectiv-Catalytic-Reduktions-Technologie (SCR) Stickoxid in Luftstickstoff und Wasserdampf umzuwandeln. Als Reduktionsmittel wird wässerige Harnstofflösung verwandt, die in einem separaten Vorratsbehälter mitgeführt wird.To reduce nitrogen oxide emissions of an internal combustion engine, it is known to convert nitrogen oxide into atmospheric nitrogen and water vapor with the aid of the selective catalytic reduction (SCR) technology. As a reducing agent, aqueous urea solution is used, which is carried in a separate reservoir.

Das im Fahrzeug mitgeführte Reduktionsmittel wird aus dem separaten Reduktionsmittelbehälter über eine Pumpe einem Dosiermodul zugeführt, von dem es in den Abgasstrom vor dem Katalysator eingespritzt wird. Vorratsbehälter, Pumpe und Dosiermodul sind über Schlauchleitungen miteinander verbunden, über die das eine wässerige Lösung darstellende Reduktionsmittel wie z.B. eine Harnstofflösung gefördert wird. Nachteilig bei diesen wässrigen Lösungen ist, dass in Abhängigkeit der Konzentration der gelösten Substanz die Gefahr des Einfrierens ab ca. H0C besteht. Es ist bekannt, den Vorratsbehälter und die Zuführungsleitungen mittels einer elektrischen Heizung zu beheizen, um die Einfriergefahr zu minimieren.The entrained in the vehicle reducing agent is supplied from the separate reducing agent tank via a pump to a metering module, from which it is injected into the exhaust stream upstream of the catalyst. Storage tank, pump and metering module are connected to each other via hose lines, via which the reducing agent representing an aqueous solution, such as a urea solution, is conveyed. A disadvantage of these aqueous solutions is that depending on the concentration of the dissolved substance, the risk of freezing from about H 0 C consists. It is known to heat the reservoir and the supply lines by means of an electric heater to minimize the risk of freezing.

Aus der DE 199 35 920 Al ist es bekannt, das im Reduktionsmittelvorratsbehälter gespeicherte Reduktionsmittel durch die Abwärme der Brennkraftmaschine zu beheizen, in dem die Kühlflüssigkeit der Brennkraftmaschine durch einen Wärmetauscher im Reduktionsmittelvorratsbehälter geführt wird. Dieses löst zwar das Problem des Einfrierens der Harnstofflösung im Vorratsbehälter, gewährleistet aber noch nicht die Einsatzbereitschaft des Dosiersystems bei sehr niedrigen Temperaturen, da die Verbindungsleitungen, Ventile und Pumpe weiterhin den niedrigen Temperaturen ausgesetzt sind und dort das Reduktionsmittel Gefahr läuft, einzufrieren.From DE 199 35 920 Al it is known to heat the reductant stored in the reducing agent reservoir by the waste heat of the internal combustion engine, in which the cooling liquid of the internal combustion engine by a heat exchanger in the Reductant reservoir is guided. Although this solves the problem of freezing the urea solution in the reservoir, but does not guarantee the readiness of the dosing at very low temperatures, since the connecting lines, valves and pump are still exposed to low temperatures and there the reducing agent at risk of freezing.

Aus der EP 1 388 648 Bl ist es daher bekannt, den von einem Hochdruckkraftstoffeinspritzsystem zurückfließenden erwärmten Kraftstoff zur Aufheizung der Reduktionsmittelleitungen zu verwenden. Dabei ist innerhalb der Kraftstoffrückleitung eine Reduktionsmittelleitung angeordnet, in dem das flüssige Reduktionsmittel in Gegenrichtung zum Einspritzpunkt gefördert wird.From EP 1 388 648 B1 it is therefore known to use the heated fuel flowing back from a high-pressure fuel injection system for heating the reducing agent lines. In this case, a reducing agent line is arranged within the fuel return line, in which the liquid reducing agent is conveyed in the opposite direction to the injection point.

Diese Anordnung ist nachteilig, da innerhalb der Koaxialleitung die Reduktionsmittelpumpe angeordnet werden muss und diese Anordnung nur bei der Erwärmung bei Hochdruckkraftstoff einspritzsystemen möglich ist. Des Weiteren besteht die Gefahr, dass es zu einer Vermischung der Medien kommt, wenn nur die kleinste Undichtigkeit entsteht. Eine solche Vermischung zerstört in kurzer Zeit den kompletten Motor durch Korrosion aufgrund der korrosiven Eigenschaften der Harnstofflösung.This arrangement is disadvantageous because within the coaxial line, the reducing agent pump must be arranged and this arrangement is possible only with the heating of high-pressure fuel injection systems. Furthermore, there is a risk that it comes to a mixing of the media, if only the smallest leak arises. Such mixing quickly destroys the entire engine due to corrosion due to the corrosive properties of the urea solution.

Der Erfindung liegt die Aufgabe zugrunde, das Einfrieren des in den Anschlussleitungen über die Förderpumpe zum Dosiermodul geleiteten flüssigen Reduktionsmittels sicher und mit geringerem Aufwand zu vermeiden.The invention has for its object to avoid the freezing of the guided in the connecting lines via the feed pump to the metering liquid reducing agent safely and with less effort.

Diese Aufgabe wird für die Vorrichtung durch die Merkmale des Patentanspruchs 1 und für das Verfahren durch die Merkmale des Anspruchs 2 gelöst.This object is achieved for the device by the features of claim 1 and for the method by the features of claim 2.

Der vom Kühlwasserkreislauf der Brennkraftmaschine abgezweigte Heizwasserkreislauf wird zirkulierend durch die gesamte Reduktionsmittelanlage geführt. Dabei verläuft er in enger Wärme abgebender Nachbarschaft zu den die Aggregate bzw. Apparaturen der Reduktionsmittelanlage verbindenden Schlauchleitungen, was beispielsweise durch eine enge gemeinsame, unter Berührung verlaufende Verlegung der Leitungen ermöglicht wird. Die Aggregate bzw. Apparaturen selbst sowie die Verbindungsanschlüsse der Schlauchleitungen werden von dem geschlossenen Heizwasserkreislauf durchströmt.The heating water circuit branched off from the cooling water circuit of the internal combustion engine is circulated through the entire reducing agent system. He goes in close heat donating neighborhood to the aggregates or apparatuses of the reducing agent system connecting hose lines, which is made possible for example by a close common, running under contact laying of the lines. The units or appliances themselves and the connection connections of the hose lines are flowed through by the closed Heizwasserkreislauf.

Anhand der schematischen Zeichnung wird nachstehend ein Ausführungsbeispiel der Erfindung näher erläutert.Reference to the schematic drawing, an embodiment of the invention will be explained in more detail below.

Der von dem hier nicht gezeigten Kühlwasserkreislauf der Brennkraftmaschine abgezweigte Heizwasserkreislauf lweist eine Wasserpumpe 2 auf, von der das Heizwasser über eine Schlauchleitung 3 zu einem Anschlussblock 4 eines Fördermoduls 5 geführt ist. Das Heizwasser durchströmt den Anschlussblock 4 und wird von dort über eine weitere Schlauchleitung 6 zu einem Anschlussblock 7 am Vorratsmittelbehälter 8 geführt, den das Heizwasser ebenfalls durchströmt und radial wieder verlässt. Von dort wird das Heizwasser zu einem innerhalb des Vorratsbehälters 8 befindlichen Wärmetauscher 9 geführt. Nach dem Durchfluss durch den Wärmetauscher 9 wird das Heizwasser über eine weitere Schlauchleitung 11 zu einem weiteren Anschlussblock 12 des Vorratsbehälters 8 geführt, durchströmt diesen und wird über eine Schlauchleitung 13 zu einem Anschlussblock 14 an dem Fördermodul 5 geleitet. Nach Durchströmen dieses Anschlussblockes 14 wird das Heizwasser zu einem weiteren Anschlussblock 15 des Fördermoduls 8 geführt, durchströmt diesen und wird zu einem Anschlussblock 16 eines Dosiermoduls 17 über eine weitere Schlauchleitung 18 geführt. Nach Durchströmen dieses Anschlussblockes 16 wird das Heizwasser wieder dem Kühlkreislauf der Brennkraftmaschine zugeleitet.The heating water circuit branched off from the cooling water circuit, not shown here, of the internal combustion engine has a water pump 2, from which the heating water is led via a hose line 3 to a connection block 4 of a conveyor module 5. The heating water flows through the connection block 4 and is led from there via a further hose line 6 to a connection block 7 on the storage medium container 8, which also flows through the heating water and leaves radially again. From there, the heating water is passed to a heat exchanger 9 located inside the storage container 8. After passing through the heat exchanger 9, the heating water is led via a further hose 11 to a further connection block 12 of the reservoir 8, flows through this and is passed via a hose 13 to a connection block 14 on the conveyor module 5. After flowing through this connection block 14, the heating water is passed to a further connection block 15 of the conveyor module 8, flows through this and is guided to a connection block 16 of a dosing 17 via a further hose 18. After flowing through this connection block 16, the heating water is fed back to the cooling circuit of the internal combustion engine.

Der Förderweg der dem Vorratsbehälter 8 entnommenen Harnstofflösung wird durch die gestrichelte Linienführung gezeigt. Es wird über den Anschlussblock 7 und eine dasThe conveying path of the urea solution taken from the reservoir 8 is shown by the dashed line. It is via the terminal block 7 and a

Reduktionsmittel transportierende Schlauchleitung 21 über den Anschlussblock 4 in das Fördermodul 5 geleitet. Das Fördermodul 5 sorgt für eine weitere Förderung einer bestimmten Menge Harnstofflösung über den Anschlussblock 15 und eine Schlauchleitung 22 zum Dosiermodul 17, von dem die Harnstofflösung dosiert in den Abgasstrom vor dem hier nicht gezeigten SCR- Katalysator mittels über eine Leitung 20 vom Fördermodul 5 zugeführte Druckluft eingespritzt wird. Die überschüssige Menge Harnstofflösung wird über den Anschlussblock 14 und eine Schlauchleitung 23 dem Vorratsbehälter 8 über seinen Anschlussblock 12 zurückgeführt.Reduction agent transporting hose 21 passed over the terminal block 4 in the conveyor module 5. The delivery module 5 ensures a further delivery of a certain amount of urea solution via the connection block 15 and a hose 22 to the dosing 17, from which the urea solution dosed into the exhaust stream before the SCR catalyst not shown here by means of a line 20 from the conveyor module 5 supplied compressed air is injected. The excess amount of urea solution will returned via the terminal block 14 and a hose 23 to the reservoir 8 via its terminal block 12.

Die Schlauchleitungen 21, 22, 23 der Harnstofflösung und die Schlauchleitungen 6, 13, 18 des Heizwassers verlaufen zwischen den Apparaturen 5, 8 und 17 in enger Wärme abgebender Nachbarschaft, was beispielsweise durch eine gemeinsame Verlegung der Schlauchleitungen als Paare realisierbar ist. Das Durchströmen des Heizwassers durch die Anschlussblöcke 4,7, 12, 14, 15 und 16 ergibt eine ausreichende Temperierung der Anschlussblöcke, so dass diese und auch die Apparaturen ausreichend beheizt sind. The hose lines 21, 22, 23 of the urea solution and the hose lines 6, 13, 18 of the heating water run between the apparatuses 5, 8 and 17 in close heat-emitting neighborhood, which can be realized for example by a common laying of the hose lines as pairs. The flowing through the heating water through the terminal blocks 4,7, 12, 14, 15 and 16 results in a sufficient temperature of the terminal blocks, so that these and the equipment are sufficiently heated.

Claims

Patentansprüche claims 1. Vorrichtung zum Beheizen einer Reduktionsmittelsmittelanlage für ein Abgasbehandlungssystem einer Brennkraftmaschine durch einen vom Kühlwasserkreislauf der Brennkraftmaschine abgezweigten Heizwasserkreislauf1. A device for heating a reducing agent means plant for an exhaust gas treatment system of an internal combustion engine by a branched off from the cooling water circuit of the internal combustion engine Heizwasserkreislauf (1), der zirkulierend durch die gesamte Reduktionsmittelsmittelanlage geführt ist und dabei durch die Apparaturen wie Fördermodul (5) und/oder Dosiermodul (17) sowie einen Vorratsbehälters (8) für das Reduktionsmittel gefördert wird, und dabei in enger wärmeabgebender Nachbarschaft zu den das Reduktionsmittel zwischen den Apparaturen und/oder dem Vorratsbehälter führenden(1), which is circulated through the entire reducing agent means plant and thereby by the apparatuses such as conveying module (5) and / or dosing (17) and a reservoir (8) is promoted for the reducing agent, and in close heat-emitting neighborhood to the Reducing agent between the apparatus and / or the reservoir leading Schlauchleitungen (21, 22, 23) geführt ist, und dabei durch die Schlauchleitungsanschlüsse (4, 7, 12, 14, 15, 16) zum Verbinden der Schlauchleitungen mit den Apparaturen und/oder dem Vorratsbehälter strömt.Hose lines (21, 22, 23) is guided, thereby flowing through the hose line connections (4, 7, 12, 14, 15, 16) for connecting the hose lines with the apparatus and / or the reservoir. 2. Verfahren zum Erwärmen des Reduktionsmittels in einer Reduktionsmittelanlage für ein Abgasreinigungssystem, bei dem das Reduktionsmittel innerhalb der Reduktionsmittelleitungen und Apparaturen erwärmt wird, wobei das Verfahren dadurch gekennzeichnet ist, dass das Reduktionsmittel innerhalb der gesamten Anlage durch von dem Kühlwasserkreislauf der Brennkraftmaschine abgezweigtes, thermische Energie tragendes Kühlwasser erwärmt wird. 2. A method for heating the reducing agent in a reducing agent plant for an exhaust gas purification system, wherein the reducing agent is heated within the reducing agent lines and apparatus, the method being characterized in that the reducing agent within the entire system by branched off from the cooling water circuit of the internal combustion engine, thermal energy carrying cooling water is heated.
EP07726520A 2006-04-13 2007-02-27 Method and device for preventing the freezing of a liquid reduction agent for treating the exhaust gas of an internal combustion engine Withdrawn EP2010767A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006017398A DE102006017398A1 (en) 2006-04-13 2006-04-13 Method and device for protecting the freezing of a liquid reducing agent for the exhaust aftertreatment of an internal combustion engine
PCT/EP2007/051821 WO2007118729A1 (en) 2006-04-13 2007-02-27 Method and device for preventing the freezing of a liquid reduction agent for treating the exhaust gas of an internal combustion engine

Publications (1)

Publication Number Publication Date
EP2010767A1 true EP2010767A1 (en) 2009-01-07

Family

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Application Number Title Priority Date Filing Date
EP07726520A Withdrawn EP2010767A1 (en) 2006-04-13 2007-02-27 Method and device for preventing the freezing of a liquid reduction agent for treating the exhaust gas of an internal combustion engine

Country Status (3)

Country Link
EP (1) EP2010767A1 (en)
DE (1) DE102006017398A1 (en)
WO (1) WO2007118729A1 (en)

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Publication number Priority date Publication date Assignee Title
DE4432577A1 (en) * 1994-09-13 1996-03-14 Siemens Ag Assembly for introduction of liq. into selective catalytic redn. assembly
DE19935920C2 (en) 1999-07-30 2003-04-17 Siemens Ag Device and method for heating a reducing agent reservoir of an exhaust gas aftertreatment system for an internal combustion engine
US6810661B2 (en) 2002-08-09 2004-11-02 Ford Global Technologies, Llc Method and system for freeze protecting liquid NOx reductants for vehicle application
JP3751962B2 (en) * 2003-09-05 2006-03-08 日産ディーゼル工業株式会社 Engine exhaust purification system
WO2005028827A1 (en) * 2003-09-19 2005-03-31 Nissan Diesel Motor Co., Ltd. Exhaust gas clarification apparatus for engine
SE529158C2 (en) * 2005-02-23 2007-05-15 Scania Cv Abp Methods and apparatus for supplying additive for exhaust gas purification and conduction

Non-Patent Citations (1)

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Title
See references of WO2007118729A1 *

Also Published As

Publication number Publication date
WO2007118729A1 (en) 2007-10-25
DE102006017398A1 (en) 2007-10-18

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