DE19947198A1 - Device for post treating exhaust gases from IC engine comprises mixing chamber for introducing reductant and closed regulating cycle for regulating and/or controlling pressure in the reductant line - Google Patents

Device for post treating exhaust gases from IC engine comprises mixing chamber for introducing reductant and closed regulating cycle for regulating and/or controlling pressure in the reductant line

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Publication number
DE19947198A1
DE19947198A1 DE19947198A DE19947198A DE19947198A1 DE 19947198 A1 DE19947198 A1 DE 19947198A1 DE 19947198 A DE19947198 A DE 19947198A DE 19947198 A DE19947198 A DE 19947198A DE 19947198 A1 DE19947198 A1 DE 19947198A1
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DE
Germany
Prior art keywords
reducing agent
line
reductant
pressure
mixing chamber
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Granted
Application number
DE19947198A
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German (de)
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DE19947198B4 (en
Inventor
Walter Frisch
Sven Huber
Hanspeter Mayer
Michael Offenhuber
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Robert Bosch GmbH
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Robert Bosch GmbH
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19947198A priority Critical patent/DE19947198B4/en
Priority to PCT/DE2000/003300 priority patent/WO2001025601A1/en
Publication of DE19947198A1 publication Critical patent/DE19947198A1/en
Application granted granted Critical
Publication of DE19947198B4 publication Critical patent/DE19947198B4/en
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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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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]
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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
    • 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
    • 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

Abstract

Device for post treating exhaust gases from an IC engine comprises a mixing chamber (8) for introducing a reductant, especially a urea or urea-water solution via a reductant line (1a) from a reductant store (1) and pressurized air via a pressurized gas line (24) from a pressurized gas store (20) to form a reductant-pressurized air mixture; and a closed regulating cycle for regulating and/or controlling a pressure prevailing in the reductant line.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Nachbehandeln von Abgasen einer Brennkraftmaschine unter Verwendung eines in die Abgase einzubringenden Reduktionsmittels, insbesondere Harnstoff bzw. Harnstoff- Wasser-Lösung, nach dem Oberbegriff des Patentanspruchs 1.The present invention relates to a device for Aftertreatment of exhaust gases from an internal combustion engine Use of one to be introduced into the exhaust gases Reducing agent, especially urea or urea Water solution, according to the preamble of claim 1.

Als Folge der in den letzten Jahren stets niedriger anzusetzenden Schadstoffgrenzwerte sind zahlreiche Vorrichtungen und Verfahren zur Nachbehandlung von Abgasen in Brennkraftmaschinen entwickelt worden. Beispielsweise mittels Katalysatorsystemen, welche Harnstoff und/oder Ammoniak als Reduktionsmittel zur NOx-Konvertierung verwenden, sind effiziente Abgasnachbehandlungssysteme zur Verfügung gestellt.As a consequence of the ever lower pollutant limit values, numerous devices and methods for the aftertreatment of exhaust gases in internal combustion engines have been developed. Efficient exhaust gas aftertreatment systems are made available, for example, by means of catalyst systems which use urea and / or ammonia as a reducing agent for NO x conversion.

Um eine Verminderung von NOx-Bestandteilen in Abgasen zu erzielen, wurden insbesondere für Dieselmotoren Reduktionskatalysatoren entwickelt, die üblicherweise in sogenannte SCR-Katalysatoren (engl. Selective Catalytic Reduction) mit Harnstoffdosiersystem und Speicherkatalysatoren unterteilt werden. Die sogenannten SCR-Katalysatoren werden mittels einer Harnstoff- und/oder Ammoniakreduktionsmittelzufuhr generiert, während die sogenannten Speicherkatalysatoren mit Kohlenwasserstoffen des mitgeführten Brennkraftmaschinen-Brennstoffs in sogenannten Abgasfettphasen regeneriert werden.In order to achieve a reduction in NO x components in exhaust gases, reduction catalysts have been developed, particularly for diesel engines, which are usually divided into so-called SCR (selective catalytic reduction) catalysts with a urea metering system and storage catalysts. The so-called SCR catalysts are generated by means of a urea and / or ammonia reducing agent supply, while the so-called storage catalysts are regenerated with hydrocarbons of the internal combustion engine fuel carried in so-called exhaust gas fat phases.

Aus der EP-A-0381236 ist ein System bekannt, welches zum Entfernen von Stickoxiden in Abgasen aus einem Dieselmotor Ammoniak als Reduktionsmittel zudosiert. Bei diesem System ist ferner ein Turbolader vorgesehen, welcher den Druck des Abgases senkt. Eine verwendete Harnstoff-Wasser-Lösung wird mittels Druckluft zudosiert.From EP-A-0381236 a system is known which for Removal of nitrogen oxides in exhaust gases from a diesel engine Ammonia metered in as a reducing agent. With this system a turbocharger is also provided, which the pressure of the Exhaust gas lowers. A urea-water solution is used dosed with compressed air.

Aus der DE-A-44 41 261 ist eine Einrichtung zum Nachbehandeln einer Brennkraftmaschine bekannt, bei welcher die Leistung des Katalysators über eine Dosiereinrichtung verbessert werden soll. Die Dosiereinrichtung ist als Kleinstmengendosier-Verdrängerpumpe ausgebildet, die auf einem zylindrischen Rotationskörper einen Gewindegang in der Form einer Nut aufweist, wobei zur Änderung der Förderungleistung der Rotationskörper mit variabler Drehzahl angetrieben wird. Die Zugabe des Reduktionsmittels in das Abgassystem erfolgt vorzugsweise kennfeldabhängig, d. h. in Abhängigkeit von Menge und/oder Zusammensetzung des Abgases.From DE-A-44 41 261 a device for Aftertreatment of an internal combustion engine is known, in which the performance of the catalyst via a metering device should be improved. The dosing device is as Small volume metering positive displacement pump designed on a cylindrical rotation body a thread in has the shape of a groove, wherein to change the Conveying performance of the rotating body with variable Speed is driven. The addition of the reducing agent in the exhaust system preferably takes place depending on the map, d. H. depending on the amount and / or composition of the exhaust gas.

Es ist beispielsweise aus der DE 42 30 056 A1 bekannt, ein Aerosol auf der Grundlage eines Reduktionsmittels und dieses beaufschlagender Druckluft in einer Mischkammer zu erzeugen. Hierbei werden das Reduktionsmittel und die Luft über getrennte Leitungen der Mischkammer zugeführt.It is known for example from DE 42 30 056 A1 Aerosol based on a reducing agent and this pressurizing compressed air in a mixing chamber  produce. Here, the reducing agent and the air fed to the mixing chamber via separate lines.

Es ist bei derartigen herkömmlichen Vorrichtungen zum Nachbehandeln einer Brennkraftmaschine üblich, eine Regelung des Betriebsdruckes des zugeführten Reduktionsmittels, insbesondere der zugeführten Harnstoff- Wasser-Lösung (HWL) mittels eines mechanischen Druckreglers durchzuführen. Derartige Druckregler weisen individuelle Kennlinien auf, die von der Durchströmmenge, der Temperatur oder auch dem Alter des Druckreglers abhängig sind, und somit zu Streu-, Drift- oder Nichtlinearitätseffekten bei der Druckregelung führen können.It is in such conventional devices for Aftertreatment of an internal combustion engine is common Regulation of the operating pressure of the supplied Reducing agent, especially the urea Water solution (HWL) using a mechanical pressure regulator perform. Such pressure regulators have individual Characteristic curves based on the flow rate, the temperature or also depend on the age of the pressure regulator, and thus to scatter, drift or non-linearity effects the pressure control can lead.

Aufgabe der Erfindung ist die Verbesserung einer gattungsgemäßen Vorrichtung zur Nachbehandlung von Abgasen dahingehend, daß eine Druckregelung des Betriebsdruckes des zugeführten Reduktionsmittels in einfacher und zuverlässiger Weise gewährleistet ist.The object of the invention is to improve one Generic device for the aftertreatment of exhaust gases in that a pressure control of the operating pressure of the supplied reducing agent in simple and is guaranteed reliably.

Diese Aufgabe wird gelöst durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 1.This object is achieved by a device with the Features of claim 1.

Durch die erfindungsgemäße Maßnahme, einen geschlossenen Regelkreis zur Regelung bzw. Steuerung eines in der Reduktionsmittelleitung herrschenden Druckes zu verwenden, können die oben erwähnten Effekte, insbesondere Drifteffekte und Nichtlinearitäten, kompensiert werden, wobei darüber hinaus mehrdimensionale Kennfelder einer Druckregelung darstellbar sind. Dies führt beispielsweise dazu, daß ein in der Reduktionsmittelleitung herrschender Druck unabhängig von einer der Mischkammer der Vorrichtung zuzuführenden Reduktionsmittelmenge eingestellt werden kann; beispielsweise kann ein mit zunehmender Reduktionsmittelmenge steigender Mischkammerdruck kompensiert werden.By the measure according to the invention, a closed Control loop for regulating or controlling one in the To use reducing agent line prevailing pressure can have the effects mentioned above, in particular Drift effects and non-linearities are compensated, in addition, multi-dimensional maps of one Pressure control can be represented. This leads, for example to the fact that a prevailing in the reducing agent line  Pressure independent of one of the mixing chamber of the device amount of reducing agent to be supplied can be set can; for example, one with increasing Reducing agent quantity increasing mixing chamber pressure be compensated.

Mittels des erfindungsgemäß vorgesehenen geschlossenen Regelkreises mit frei steuerbarem Reduktionsmitteldruck kann somit die Reduktionsmittel-Dosierung und Gemischaufbereitung den jeweiligen Betriebszuständen angepaßt werden.By means of the closed provided according to the invention Control circuit with freely controllable reducing agent pressure can thus the reducing agent dosage and Mixture preparation according to the respective operating conditions be adjusted.

Vorteilhafte Ausgestaltungen der erfindungsgemäßen Vorrichtung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention Device are the subject of the dependent claims.

Gemäß einer bevorzugten Ausführung der erfindungsgemäßen Vorrichtung weist der geschlossene Regelkreis ein mittels eines Steuergerätes ansteuerbares Magnetventil zur Druckregelung und einen mit dem Steuergerät in Wirkverbindung stehenden Drucksensor zur Detektierung des in der Reduktionsmittelleitung herrschenden Druckes auf. Derartige Bauteile sind in preiswerter Weise verfügbar und erweisen sich in der Praxis als robust und zuverlässig, so daß auf der Grundlage derartiger Bauteile ein zuverlässiger Regelkreis bereitstellbar ist.According to a preferred embodiment of the invention The closed control circuit has a device of a control device controllable solenoid valve for Pressure control and one with the control unit in Actively connected pressure sensor for detecting the pressure prevailing in the reducing agent line. Such components are available and inexpensive prove to be robust and reliable in practice, so that based on such components a reliable Control loop can be provided.

Zweckmäßigerweise ist das Reduktionsmittel über ein als Magnetventil ausgeführtes Einspritzventil in die Mischkammer einführbar, wobei das Einspritzventil insbesondere baugleich mit dem Magnetventil zur Druckregelung in der Reduktionsmittelleitung ausgebildet ist. Durch baugleiche Ausbildung der erwähnten Einspritzventile sind die Kosten der Vorrichtung insgesamt weiter reduzierbar.The reducing agent is expediently via an as Solenoid valve designed injection valve in the Mixing chamber insertable, the injection valve in particular identical to the solenoid valve Pressure control trained in the reducing agent line  is. By structurally identical training of the mentioned Injectors are the total cost of the device further reducible.

Die Erfindung wird nun anhand einer bevorzugten Ausführungsform weiter beschrieben.The invention is now based on a preferred Embodiment further described.

Es zeigt:It shows:

Fig. 1 eine blockschaltbildartige Ansicht einer bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung. Fig. 1 is a block diagram view of a preferred embodiment of the device according to the invention.

In Fig. 1 ist mit 1 ein Harnstofftank bezeichnet, aus welchem eine Harnstoff-Wasser-Lösung über eine Leitung 1a mit einem Rückschlagventil 2 und einem als Filtersieb ausgeführten Filter 3 von einer Förderpumpe 4 angesaugt und über einen Druck- bzw. Pulsationsdämpfer 5 sowie ein weiteres Rückschlagventil 6 zu einem Dosierventil 7 einer Mischkammer 8 gefördert wird. Das Dosierventil 7 dosiert die erforderliche Menge an Harnstoff-Wasser-Lösung in einen Mischraum, welcher in der Figur nicht im einzelnen dargestellt ist. Ein den Druck in der Leitung 1a detektierender Drucksensor ist mit 10 bezeichnet. Ferner zweigt von der Leitung 1a ein Rückführleitung 1b ab, welche mittels eines als 2/2-Wege-Magnetventils 11 beaufschlagbar ist. In der Rückführleitung 1b ist ein weiteres Rückschlagventil 2a ausgebildet.In Fig. 1, 1 denotes a urea tank, from which a urea-water solution via a line 1 a with a check valve 2 and a filter 3 designed as a filter 3 is sucked by a feed pump 4 and via a pressure or pulsation damper 5 and a further check valve 6 is conveyed to a metering valve 7 of a mixing chamber 8 . The metering valve 7 doses the required amount of urea-water solution in a mixing room, which is not shown in detail in the figure. A pressure sensor detecting the pressure in line 1 a is designated by 10 . Furthermore, a return line 1 b branches off from the line 1 a, which can be acted upon by a 2/2-way solenoid valve 11 . Another check valve 2 a is formed in the return line 1 b.

Der Drucksensor 10 überträgt detektierte Druckwerte über eine Leitung 50 in ein Steuergerät 40. Ein Regler 52 ist als Software in dem Steuergerät integriert ausgebildet. Das Steuergerät 40 gibt, in Abhängigkeit von den mittels des Drucksensors 10 detektierten Druckwerten in der Leitung 1a, über eine Steuerleitung 51 Steuersignale auf das Magnetventil 11. Durch entsprechende Betätigung des Magnetventils 11 ist die Rückführleitung öffenbar oder sperrbar, wodurch eine Regelung des Druckes innerhalb der Leitung 1a durchführbar ist. Mittels des Drucksensors 10, des Reglers 52, des Magnetventils 11 und der entsprechenden Leitungen 50, 51 ist daher ein geschlossener Regelkreis zur Regelung des Drucks in der Leitung 1a zur Verfügung gestellt. Mittels des Magnetventils 11 ist ferner beispielsweise eine notwendige Entlüftung der Leitung 1a durchführbar. Gemäß einer nicht im einzelnen dargestellten Ausführungsform wäre es denkbar, daß die Reglerfunktion durch das Steuergerät 40 übernommen wird.The pressure sensor 10 transmits detected pressure values to a control device 40 via a line 50 . A controller 52 is designed as software integrated in the control unit. Depending on the pressure values in line 1 a detected by the pressure sensor 10, the control device 40 sends control signals to the solenoid valve 11 via a control line 51 . The return line can be opened or blocked by corresponding actuation of the solenoid valve 11 , as a result of which the pressure within the line 1 a can be regulated. Therefore, by the pressure sensor 10, the controller 52, the solenoid valve 11 and the corresponding conduits 50, 51, a closed control loop for regulating the pressure in the conduit 1 a is provided. By means of the solenoid valve 11 , for example, a necessary ventilation of the line 1 a can be carried out. According to an embodiment that is not shown in detail, it would be conceivable that the controller function is taken over by the control device 40 .

Mit 20 ist ferner ein Druckluftbehälter bezeichnet, aus welchem Druckluft über einen Druckbegrenzer 21, ein 2/2- Wegeventil 22 und ein Rückschlagventil 23 in die Mischkammer 8 einbringbar ist. Durch Vorsehen des Rückschlagventils 23, welches beispielsweise als Kugelventil oder Flachventil ausgebildet sein kann, kann ein Rückströmen eines Reduktionsmittel-Luft-Gemisches aus der Mischkammer in die Druckluftleitung verhindert werden. Hierdurch ist in vorteilhafter Weise die Gefahr einer Kontamination eines mit der Druckluftleitung 24 kommunizierenden Druckluft-Bordnetzes gegenüber herkömmlichen Systemen stark reduziert. 20 also denotes a compressed air container from which compressed air can be introduced into the mixing chamber 8 via a pressure limiter 21 , a 2/2-way valve 22 and a check valve 23 . By providing the check valve 23 , which can be designed, for example, as a ball valve or flat valve, backflow of a reducing agent-air mixture from the mixing chamber into the compressed air line can be prevented. This advantageously greatly reduces the risk of contamination of an on-board compressed air system communicating with the compressed air line 24 compared to conventional systems.

In der Mischkammer 8 wird unter Beaufschlagung der Harnstoff-Wasser-Lösung mittels der Druckluft ein Aerosol und ein Wandfilm erzeugt, welche über eine Aerosolleitung 25 in einen Katalysator 30 eingebracht werden. Das Steuergerät 40 erfaßt hierbei Signale, die von einem übergeordneten Motorsteuergerät über eine CAN-Datenleitung 41 empfangen werden, sowie die Signale von Druck-, Temperatur- bzw. Füllstandssensoren 61 bis 65, deren Funktionsweise an sich bekannt ist und hier nicht weiter erläutert wird. Das Steuergerät 40 berechnet aus diesen Informationen eine Harnstoff-Dosiermenge, welche einem den Katalysator 30 durchströmenden Abgas zugegeben werden soll.An aerosol and a wall film are generated in the mixing chamber 8 by applying compressed air to the urea-water solution, which aerosol are introduced into a catalyst 30 via an aerosol line 25 . The control unit 40 detects signals that are received by a higher-level engine control unit via a CAN data line 41 , as well as the signals from pressure, temperature and level sensors 61 to 65 , the functioning of which is known per se and will not be explained further here. The control unit 40 uses this information to calculate a urea metering quantity which is to be added to an exhaust gas flowing through the catalytic converter 30 .

Das Steuergerät 40 regelt ferner mit Hilfe der beschriebenen Magnetventile sowohl den Druck in der Druckluftleitung 24, als auch mit Hilfe des Magnetventils 11 (Entlüftungsventil) und des Harnstoffdrucksensors 10 den Druck in der Harnstoffleitung 1a. Mittels des Steuergerätes 40 sind Abweichungen und Fehler erkennbar und speicherbar. Der Fehlerspeicher kann aus dem Steuergerät mit Hilfe eines Interfaces und entsprechender Diagnosesoftware ausgelesen werden.The control unit 40 also regulates the pressure in the compressed air line 24 with the aid of the described solenoid valves, and also the pressure in the urea line 1 a with the aid of the solenoid valve 11 (vent valve) and the urea pressure sensor 10 . Deviations and errors can be identified and stored by means of the control device 40 . The error memory can be read out of the control unit with the help of an interface and the corresponding diagnostic software.

Claims (3)

1. Vorrichtung zum Nachbehandeln von Abgasen einer Brennkraftmaschine unter Verwendung eines in die Abgase einzubringenden Reduktionsmittels, insbesondere eines Harnstoffs bzw. einer Harnstoff-Wasser-Lösung, mit einer Mischkammer (8), in welche in einem Reduktionsmittelspeicher (1) gespeichertes Reduktionsmittel über eine Reduktionsmittelleitung (1a), und in einem Druckluftspeicher (20) enthaltene Druckluft über eine Druckluftleitung (24) zur Erzeugung eines Reduktionsmittel- Luft-Gemisches einbringbar sind, gekennzeichnet durch einen geschlossenen Regelkreis (1a, 10, 11, 50, 51, 52) zur Regelung bzw. Steuerung eines in der Reduktionsmittelleitung (1a) herrschenden Druckes.1. Device for the aftertreatment of exhaust gases from an internal combustion engine using a reducing agent to be introduced into the exhaust gases, in particular a urea or a urea-water solution, with a mixing chamber ( 8 ) into which reducing agent stored in a reducing agent store ( 1 ) is via a reducing agent line ( 1 a), and compressed air contained in a compressed air reservoir ( 20 ) can be introduced via a compressed air line ( 24 ) to produce a reducing agent-air mixture, characterized by a closed control circuit ( 1 a, 10 , 11 , 50 , 51 , 52 ) for regulating or controlling a pressure prevailing in the reducing agent line ( 1 a). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der geschlossene Regelkreis ein mittels eines Steuergerätes und/oder Reglers (40, 52) ansteuerbares Magnetventil (11) zur Druckregelung und einen mit dem Steuergerät (40) und/oder Regler (52) in Wirkverbindung stehenden Drucksensor (10) zur Detektierung des in der Reduktionsmittelleitung (1a) herrschenden Druckes aufweist. 2. Apparatus according to claim 1, characterized in that the closed control circuit is a solenoid valve ( 11 ) controllable by means of a control unit and / or regulator ( 40 , 52 ) for pressure control and one with the control unit ( 40 ) and / or regulator ( 52 ) in Has an operatively connected pressure sensor ( 10 ) for detecting the pressure prevailing in the reducing agent line ( 1 a). 3. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Reduktionsmittel über ein als Magnetventil ausgeführtes Einspritzventil (7) in die Mischkammer einführbar ist, wobei das Einspritzventil (7) insbesondere baugleich mit dem Magnetventil (11) zur Druckregelung ausgeführt ist.3. A device according to any one of claims 1 or 2, characterized in that the reducing agent is introduced into the mixing chamber via a configured as a solenoid injection valve (7), wherein the injection valve (7) is in particular identical with the solenoid valve (11) to regulate the pressure .
DE19947198A 1999-10-01 1999-10-01 Device for aftertreatment of exhaust gases of an internal combustion engine Expired - Fee Related DE19947198B4 (en)

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WO2002101209A1 (en) 2001-06-08 2002-12-19 Robert Bosch Gmbh Device and method for metering a reductant for eliminating nitrogen oxide from exhaust gases
US6739126B2 (en) 2001-12-03 2004-05-25 Purem Abgassystem Gmbh & Co.Kg Reducing agent dosing device
US6845611B2 (en) 2001-12-03 2005-01-25 Purem Abgassysteme Gmbh & Co. Kg Reducing agent dosing device
US6912846B2 (en) 2000-09-22 2005-07-05 Robert Bosch Gmbh Method and apparatus for metering a reducing agent for removing nitrogen oxides from exhaust gases
WO2005099874A1 (en) * 2004-04-15 2005-10-27 Robert Bosch Gmbh Method and device for introducing a reagent into an exhaust gas channel of an internal combustion engine
EP1612381A1 (en) * 2004-06-30 2006-01-04 Iveco S.p.A. System and method for injecting a liquid into a gas stream, exhaust gas treatment device and vehicle incorporating said device
EP1634637A1 (en) * 2004-09-08 2006-03-15 Robert Bosch Gmbh Process and device for adding a reagent in the exhaust gas of a combustion engine
DE102007004687A1 (en) * 2007-01-25 2008-08-14 Hydraulik-Ring Gmbh Calibrated dosing unit, in particular an exhaust aftertreatment unit
WO2009010569A1 (en) * 2007-07-18 2009-01-22 Continental Automotive Gmbh Device and method for metering a reducing agent into an exhaust gas system of a vehicle
DE102008013960A1 (en) * 2008-03-12 2009-09-17 Albonair Gmbh Dosing system for injecting a urea solution into the exhaust stream of an internal combustion engine
DE102009005790A1 (en) * 2009-01-22 2010-07-29 Albonair Gmbh dosing
WO2011134893A1 (en) * 2010-04-28 2011-11-03 Emitec Gesellschaft Für Emissionstechnologie Mbh Device for deliver reducing agent
DE102011087856A1 (en) 2011-12-07 2013-06-13 Robert Bosch Gmbh Damping element for e.g. hydraulic damping pressure fluctuations, in fluid-carrying arrangement in combustion engine of vehicle, has supporting element carrying distributed locations when compensating element experiences deformation
DE102011089502A1 (en) 2011-12-22 2013-06-27 Robert Bosch Gmbh Device for measuring flow rate of fluid such as aqueous urea solution, of fluid dose arrangement of combustion engine used in vehicle, has orifice and return valve that are provided in measuring conduit which is bridged with passage
DE102012216283A1 (en) 2012-09-13 2014-03-13 Robert Bosch Gmbh Pneumatically operated diaphragm pump for proportioning aid to post-treatment of exhaust gas from combustion engine of motor car, has switchable single piloted valve for moving conveying element arranged in element space
US9272244B2 (en) 2009-01-22 2016-03-01 Albonair Gmbh Metering system
DE102014220150A1 (en) 2014-10-06 2016-04-07 Robert Bosch Gmbh Method for pressure control of an SCR denoxing system of a motor vehicle
DE102004056412B4 (en) * 2004-11-23 2016-06-16 Robert Bosch Gmbh Method for operating an internal combustion engine and device for carrying out the method
US9702291B2 (en) 2015-11-03 2017-07-11 Tenneco Automotive Operating Company Inc. Exhaust aftertreatment system with ammonia gas generator
US9790830B2 (en) 2015-12-17 2017-10-17 Tenneco Automotive Operating Company Inc. Exhaust after-treatment system including electrolysis generated H2 and NH3
US10036291B2 (en) 2016-01-20 2018-07-31 Tenneco Automotive Operating Company Inc. Exhaust after-treatment system including ammonia and hydrogen generation
EP3421744A1 (en) * 2005-12-22 2019-01-02 Emitec Denmark A/S A fluid transfer system and method
US10458302B2 (en) 2015-08-20 2019-10-29 Tenneco Automotive Operating Company Inc. Exhaust aftertreatment system with ammonia gas generator

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Cited By (27)

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Publication number Priority date Publication date Assignee Title
US6912846B2 (en) 2000-09-22 2005-07-05 Robert Bosch Gmbh Method and apparatus for metering a reducing agent for removing nitrogen oxides from exhaust gases
WO2002101209A1 (en) 2001-06-08 2002-12-19 Robert Bosch Gmbh Device and method for metering a reductant for eliminating nitrogen oxide from exhaust gases
US6739126B2 (en) 2001-12-03 2004-05-25 Purem Abgassystem Gmbh & Co.Kg Reducing agent dosing device
US6845611B2 (en) 2001-12-03 2005-01-25 Purem Abgassysteme Gmbh & Co. Kg Reducing agent dosing device
WO2005099874A1 (en) * 2004-04-15 2005-10-27 Robert Bosch Gmbh Method and device for introducing a reagent into an exhaust gas channel of an internal combustion engine
EP1612381A1 (en) * 2004-06-30 2006-01-04 Iveco S.p.A. System and method for injecting a liquid into a gas stream, exhaust gas treatment device and vehicle incorporating said device
EP1634637A1 (en) * 2004-09-08 2006-03-15 Robert Bosch Gmbh Process and device for adding a reagent in the exhaust gas of a combustion engine
DE102004056412B4 (en) * 2004-11-23 2016-06-16 Robert Bosch Gmbh Method for operating an internal combustion engine and device for carrying out the method
EP3421744A1 (en) * 2005-12-22 2019-01-02 Emitec Denmark A/S A fluid transfer system and method
DE102007004687B4 (en) * 2007-01-25 2012-03-01 Hydraulik-Ring Gmbh Volume quantity dispensing unit and method for calibrating the pressure output signal volume quantity characteristic
DE102007004687A1 (en) * 2007-01-25 2008-08-14 Hydraulik-Ring Gmbh Calibrated dosing unit, in particular an exhaust aftertreatment unit
WO2009010569A1 (en) * 2007-07-18 2009-01-22 Continental Automotive Gmbh Device and method for metering a reducing agent into an exhaust gas system of a vehicle
DE102008013960A1 (en) * 2008-03-12 2009-09-17 Albonair Gmbh Dosing system for injecting a urea solution into the exhaust stream of an internal combustion engine
US9057304B2 (en) 2008-03-12 2015-06-16 Albonair Gmbh Metering system for injecting a urea solution into the exhaust gas flow of an internal combustion engine
DE102009005790A1 (en) * 2009-01-22 2010-07-29 Albonair Gmbh dosing
DE102009005790B4 (en) 2009-01-22 2023-05-17 Albonair Gmbh dosing system
US9272244B2 (en) 2009-01-22 2016-03-01 Albonair Gmbh Metering system
WO2011134893A1 (en) * 2010-04-28 2011-11-03 Emitec Gesellschaft Für Emissionstechnologie Mbh Device for deliver reducing agent
US9057306B2 (en) 2010-04-28 2015-06-16 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Device for delivering reducing agent and motor vehicle having the device
DE102011087856A1 (en) 2011-12-07 2013-06-13 Robert Bosch Gmbh Damping element for e.g. hydraulic damping pressure fluctuations, in fluid-carrying arrangement in combustion engine of vehicle, has supporting element carrying distributed locations when compensating element experiences deformation
DE102011089502A1 (en) 2011-12-22 2013-06-27 Robert Bosch Gmbh Device for measuring flow rate of fluid such as aqueous urea solution, of fluid dose arrangement of combustion engine used in vehicle, has orifice and return valve that are provided in measuring conduit which is bridged with passage
DE102012216283A1 (en) 2012-09-13 2014-03-13 Robert Bosch Gmbh Pneumatically operated diaphragm pump for proportioning aid to post-treatment of exhaust gas from combustion engine of motor car, has switchable single piloted valve for moving conveying element arranged in element space
DE102014220150A1 (en) 2014-10-06 2016-04-07 Robert Bosch Gmbh Method for pressure control of an SCR denoxing system of a motor vehicle
US10458302B2 (en) 2015-08-20 2019-10-29 Tenneco Automotive Operating Company Inc. Exhaust aftertreatment system with ammonia gas generator
US9702291B2 (en) 2015-11-03 2017-07-11 Tenneco Automotive Operating Company Inc. Exhaust aftertreatment system with ammonia gas generator
US9790830B2 (en) 2015-12-17 2017-10-17 Tenneco Automotive Operating Company Inc. Exhaust after-treatment system including electrolysis generated H2 and NH3
US10036291B2 (en) 2016-01-20 2018-07-31 Tenneco Automotive Operating Company Inc. Exhaust after-treatment system including ammonia and hydrogen generation

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