DE102008000549A1 - Exhaust gas post processing apparatus for internal combustion engine of vehicle, has stirring operation control part controlling stirring operation of aqueous solution based on freezing monitoring information from freezing monitoring part - Google Patents
Exhaust gas post processing apparatus for internal combustion engine of vehicle, has stirring operation control part controlling stirring operation of aqueous solution based on freezing monitoring information from freezing monitoring part Download PDFInfo
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- DE102008000549A1 DE102008000549A1 DE102008000549A DE102008000549A DE102008000549A1 DE 102008000549 A1 DE102008000549 A1 DE 102008000549A1 DE 102008000549 A DE102008000549 A DE 102008000549A DE 102008000549 A DE102008000549 A DE 102008000549A DE 102008000549 A1 DE102008000549 A1 DE 102008000549A1
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- urea water
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
-
- 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]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
-
- 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
- F01N2290/00—Movable parts or members in exhaust systems for other than for control purposes
- F01N2290/02—Movable parts or members in exhaust systems for other than for control purposes with continuous rotary movement
- F01N2290/06—Movable parts or members in exhaust systems for other than for control purposes with continuous rotary movement driven by auxiliary drive
-
- 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
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1811—Temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
HINTERGRUND DER ERFINDUNGBACKGROUND OF THE INVENTION
1. Gebiet der Erfindung1. Field of the invention
Die vorliegende Erfindung bezieht sich auf eine Abgasreinigungsvorrichtung für eine Brennkraftmaschine, und genauer gesagt auf eine derartige Vorrichtung, die einen Katalysator zum Reduzieren von Stickoxiden unter Verwendung von Harnstoff als ein Reduktionsmittel aufweist (als SCR-Katalysator bezeichnet).The The present invention relates to an exhaust gas purification device for an internal combustion engine, and more particularly to a Such device comprising a catalyst for reducing Nitrogen oxides using urea as a reducing agent (referred to as SCR catalyst).
2. Beschreibung des Stands der Technik2. Description of the stand of the technique
Bisher
war eine Abgasreinigungsvorrichtung zum Reinigen von in Abgas enthaltenen
Stickoxiden schon bekannt, bei der Harnstoff als ein Reduktionsmittel
verwendet wird. Ein typisches Beispiel einer üblichen Vorrichtung
ist in
Harnstoffwasser wird in dem SCR-System als ein Reduktionsmittel verwendet, da Harnstoffwasser einfacher als Ammoniak zu handhaben ist und ungiftig ist. Gewöhnlich wird Harnstoffwasser verwendet, das 32,5% Harnstoff enthält, da es die niedrigste Gefriertemperatur aufweist, nämlich –11°C. In einem sehr kalten Winter besteht jedoch die Möglichkeit, dass eine Temperatur unter –11°C sinkt. Das bedeutet, dass eine Möglichkeit besteht, dass das Harnstoffwasser teilweise oder vollständig gefriert, falls eine Temperatur unter eine Erstarrungstemperatur des Harnstoffwassers sinkt. Ein Volumen des Harnstoffwassers, das in dem Tank enthalten ist, nimmt zu, wenn es gefriert, und der Tank kann durch das gefrorene Harnstoffwasser beschädigt werden.urea water is used in the SCR system as a reducing agent since urea water easier to handle than ammonia is and is non-toxic. Usually urea water containing 32.5% urea is used since it has the lowest freezing temperature, namely -11 ° C. However, in a very cold winter, there is a possibility that a temperature falls below -11 ° C. That means, that there is a possibility that the urea water partly or completely freezes, if a temperature falls below a solidification temperature of the urea water. One Volume of urea water contained in the tank decreases too, when it freezes, and the tank can through the frozen urea water to be damaged.
Um
dieses Problem zu bewältigen, schlägt das Dokument
Das nachfolgende Problem tritt jedoch bei dem vorhergehend beschriebenen herkömmlichen System auf. Sowie das Harnstoffwasser in dem Tank einmal teilweise gefroren ist, weist ein Teil des Harnstoffwassers, der nicht gefroren ist, eine hohe Harnstoffdichte auf. In diesem Fall wird nur der nicht gefrorene Teil des Harnstoffwassers mit einer hohen Dichte zu dem Abgasrohr zugeführt. Mit einem Voranschreiten des Gefrierens des Harnstoffwassers wird die Harnstoffdichte in dem nicht gefrorenen Teil höher. Wenn die Harnstoffdichte in dem nicht gefrorenen Teil höher als eine Sättigungsdichte (beispielsweise höher als 50%) wird, wird kristallförmiger Harnstoff ausgefällt. Sowie das Ausfällen einmal auftritt, wird es schwierig, das ausgefällte Harnstoffkristall durch Erwärmen wieder zu Harnstoffwasser zu schmelzen. Demnach enthält das Harnstoffwasser, das teilweise gefroren und wieder geschmolzen wird, den Harnstoff in einer Dichte, die niedriger ist als ein Ursprungsniveau. In diesem Fall wird das Harnstoffwasser mit einer niedrigeren Dichte zu dem Abgasrohr zugeführt. Das bedeutet, dass die Harnstoffdichte in dem Harnstoffwasser, das zu dem Abgasrohr zugeführt wird, unbeständig wird.The However, the following problem occurs in the previously described conventional system. As well as the urea water in Once partially frozen in the tank, part of the urea water, which is not frozen, has a high urea density. In this Case is only the non-frozen part of the urea water with fed to the exhaust pipe of a high density. With a Progress of the freezing of the urea water becomes the urea density higher in the unfrozen part. When the urea density in the non-frozen part higher than a saturation density (for example, higher than 50%) becomes more crystalline Urea precipitated. As well as the failures once occurs, it is difficult to pass through the precipitated urea crystal Warm again to melt urea water. Therefore contains the urea water, which is partially frozen and is melted again, the urea in a density lower is as a source level. In this case, the urea water supplied at a lower density to the exhaust pipe. This means that the urea density in the urea water, the is supplied to the exhaust pipe is unstable.
Es ist möglich, die Heizeinrichtung zu betreiben, bevor das Harnstoffwasser teilweise gefriert. In diesem Fall ist es jedoch schwierig, das Harnstoffwasser in dem Tank gleichmäßig zu erwärmen. Ein Teil des Harnstoffwassers, der der Heizeinrichtung nahe ist, wird mit einer höheren Temperatur als ein Teil des Harnstoffwassers erwärmt, der sich weg von der Heizeinrichtung und nahe an den Wänden des Tanks befindet. Das bedeutet, dass die Harnstoffdichte in dem Harnstoffwasser in dem Tank ungleichmäßig wird. Wenn das Harnstoffwasser auf einer sehr niedrigen Temperatur gehalten wird, ohne gerührt zu werden, kann das Harnstoffwasser ferner vollständig gefrieren, und es braucht eine lange Zeit, um das Harnstoffwasser wieder zu schmelzen und um es zu dem Abgasrohr zuzuführen. Zudem wird die Harnstoffdichte im Zuge des Schmelzens unbeständig, wie es vorhergehend angemerkt worden ist.It is possible to operate the heater before the Urea water partially freezes. In this case, it is difficult, the urea water in the tank evenly to warm up. Part of the urea water near the heater is, with a higher temperature than a part of the Urea water heats up, moving away from the heater and is located near the walls of the tank. That means, the urea density in the urea water in the tank is uneven becomes. When the urea water is at a very low temperature can be kept without being stirred, the urea water Furthermore, completely freeze, and it takes a long time Time to melt the urea water again and bring it to the Supply exhaust pipe. In addition, the urea density in the Course of melting inconsistent, as previously noted has been.
ZUSAMMENFASSUNG DER ERFINDUNGSUMMARY OF THE INVENTION
Die vorliegende Erfindung wurde anbetrachts des vorhergehend genannten Problems gemacht, und eine Aufgabe der vorliegenden Erfindung ist es, eine Abgasreinigungsvorrichtung bereitzustellen, bei der ein Gefrieren oder ein Erstarren des Harnstoffwassers bei einer niedrigen Temperatur verhindert wird und bei der eine Temperatur des Harnstoffwassers in einem Tank gleichmäßig gehalten wird.The present invention has been made in consideration of the above-mentioned problem, and an object of the present invention is to provide an exhaust gas purification apparatus in which freezing or solidification of the gas Urea water is prevented at a low temperature and in which a temperature of the urea water is kept uniform in a tank.
Die Abgasreinigungsvorrichtung gemäß der vorliegenden Erfindung wird in einer Brennkraftmaschine verwendet, wie zum Beispiel einer Dieselmaschine, um im Abgas enthaltene Stickoxide zu reduzieren. Die Abgasreinigungsvorrichtung hat einen in einem Abgasrohr angeordneten Katalysator, einen in dem Abgasrohr stromaufwärts des Katalysators angeordneten Injektor und einen Tank, der Harnstoffwasser enthält, das durch einen Harnstoffwasserdurchgang zu dem Injektor zugeführt wird. Die Stickoxide werden an dem Katalysator unter Verwendung von aus dem Harnstoffwasser gebildetem Ammoniak, das in das Abgasrohr eingespritzt wird, zu harmlosen Komponenten reduziert.The Exhaust gas purification device according to the present invention Invention is used in an internal combustion engine, such as a diesel engine to reduce nitrogen oxides contained in the exhaust gas. The exhaust gas purification device has one arranged in an exhaust pipe Catalyst, one in the exhaust pipe upstream of the catalyst arranged injector and a tank containing urea water, fed through a urea water passage to the injector becomes. The nitrogen oxides are attached to the catalyst using from the urea water formed ammonia, which in the exhaust pipe is injected, reduced to harmless components.
Das in dem Tank enthaltene Harnstoffwasser wird durch eine Vorrichtung gerührt, die beispielsweise aus Flügeln und einem Motor zum Antreiben der Flügel besteht, um die Temperatur und die Dichte des Harnstoffwassers in dem Tank gleichmäßig zu machen, wodurch das Harnstoffwasser daran gehindert wird, bei einer niedrigen Temperatur teilweise zu gefrieren. Ein Betrieb der Rührvorrichtung wird durch eine elektronische Steuerungseinheit basierend auf der Temperatur gesteuert, die durch eine Sensorvorrichtung erfasst wird, wie zum Beispiel einen Temperatursensor. Wenn die Harnstoffwassertemperatur auf eine Temperatur fällt, bei der das Harnstoffwasser teilweise gefriert, wird das Harnstoffwasser durch die Flügel gerührt, um das teilweise Gefrieren des Harnstoffwassers zu unterdrücken. Durch Rühren des Harnstoffwassers wird die Harnstoffdichte in dem Harnstoffwasser gleichmäßig gemacht.The Urea water contained in the tank is passed through a device stirred, for example, from wings and a Motor for driving the wings insists to the temperature and the density of urea water in the tank evenly to prevent the urea water is prevented from partially freezing at a low temperature. An operation of Stirring device is controlled by an electronic control unit controlled by the temperature controlled by a sensor device is detected, such as a temperature sensor. If the Urea water temperature drops to a temperature at the urea water partially freezes, becomes the urea water stirred through the wings to freeze the partial urea water to suppress. By stirring urea water becomes urea density in urea water made evenly.
Zusätzlich zu der Rührvorrichtung kann eine Heizvorrichtung in dem Tank eingebaut sein. Sowohl die Rührvorrichtung als auch die Heizeinrichtung werden angeschaltet, wenn die Harnstoffwassertemperatur auf eine Temperatur fällt, bei der das Harnstoffwasser teilweise gefriert. Wenn die Harnstoffwassertemperatur auf eine Temperatur steigt, bei der keine Möglichkeit des teilweisen Gefrierens besteht, wird der Betrieb der Rührvorrichtung und der Heizvorrichtung beendet. Wenn die Rührvorrichtung und die Heizvorrichtung betrieben werden, wenn die Maschine nicht in Betrieb ist, werden sie umsichtig betrieben, um nicht die Batterie aufzubrauchen, während die Bedingungen der Batterie kontrolliert werden.additionally to the stirring device, a heating device in the Tank be installed. Both the stirrer and the heater is turned on when the urea water temperature falls to a temperature at which the urea water partially frozen. When the urea water temperature on a Temperature rises, with no possibility of partial Freezing is the operation of the stirring device and the heater stops. When the stirring device and the heater can be operated when the machine is not In operation, they are operated prudently so as not to damage the battery while the conditions of the battery are controlled become.
Durch Rühren des in dem Tank enthaltenen Harnstoffwassers kann dessen Temperatur und Dichte in dem Tank gleichmäßig gemacht werden, wodurch ein teilweises Gefrieren des Harnstoffwassers verhindert wird. Andere Aufgaben und Merkmale der vorliegenden Erfindung sind durch ein besseres Verständnis des bevorzugten Ausführungsbeispiels ersichtlich, das nachfolgend in Bezug auf die nachfolgenden Zeichnungen beschrieben ist.By Stirring of the urea water contained in the tank can its temperature and density in the tank evenly be made, whereby a partial freezing of the urea water prevented becomes. Other objects and features of the present invention are through a better understanding of the preferred embodiment it can be seen below with reference to the following drawings is described.
KURZBESCHREIBUNG DER ZEICHNUNGENBRIEF DESCRIPTION OF THE DRAWINGS
AUSFÜHRLICHE BESCHREIBUNG DES BEVORZUGTEN AUSFÜHRUNGSBEISPIELSDETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Ein
bevorzugtes Ausführungsbeispiel der vorliegenden Erfindung
ist mit Bezug auf
Wie
es in
Die
Abgasreinigungsvorrichtung weist einen Oxidationskatalysator
Der
SCR-Katalysator
Das
Harnstoffwasser ist in dem Tank
Der
Injektor
Das
Ammoniak reagiert mit NOx an dem SCR-Katalysator
Die
Harnstoffdichte in den Harnstoffwasser, das in dem Tank
Um
das vorhergehend genannte Problem zu bewältigen ist eine
Rührvorrichtung
Die
Rührvorrichtung
Es
ist wünschenswert, eine Heizeinrichtung
Die
Heizeinrichtung
Es
ist vorzuziehen, die Pumpe
Vorteile,
die in dem vorhergehend beschriebenen Ausführungsbeispiel
erlangt werden, sind nachfolgend zusammengefasst. Da das Harnstoffwasser
in dem Tank
Da
die Pumpe
Die
Heizeinrichtung
Ein
Vorgang des Steuerns der Rührvorrichtung ist in Bezug auf
Bei
Schritt S2 wird die Harnstoffwassertemperatur T durch den Temperatursensor
Bei
Schritt S4 werden die Rührvorrichtung
Der
Steuerungsvorgang, der in
Falls
die Temperatur T höher als Ta ist, geht der Vorgang zu
Schritt S14 über, in dem bestimmt wird, ob eine Zufuhr
des Harnstoffwassers angefordert ist, oder nicht. Falls eine Harnstoffwasserzufuhr angefordert
ist, geht der Vorgang zu Schritt S15 über, in dem ein Betrieb
der Pumpe
Demgegenüber,
falls die Antworten auf Schritte S13, S14 und S16 negativ sind,
geht der Vorgang direkt zu Schritt S20 über, während
die Pumpe
Die
Rührvorrichtung
Die
vorliegende Erfindung ist nicht auf das vorhergehend beschriebene
Ausführungsbeispiel begrenzt, sondern kann verschieden
abgewandelt werden. Beispielsweise kann eine Energiequelle für
die Rührvorrichtung
Während die vorliegende Erfindung mit Bezug auf das vorhergehende bevorzugte Ausführungsbeispiel gezeigt und beschrieben worden ist, ist es dem Fachmann ersichtlich, dass Änderungen in der Form und in Einzelheiten darin durchgeführt werden können, ohne von dem Umfang der Erfindung abzuweichen, wie in den angehängten Ansprüchen definiert ist.While the present invention with reference to the preceding preferred Embodiment has been shown and described It will be apparent to those skilled in the art that changes in the Form and in details can be done in it without departing from the scope of the invention, as in the appended Claims is defined.
Eine Abgasreinigungsvorrichtung der vorliegenden Erfindung wandelt Stickoxide, die im Abgas einer Brennkraftmaschine enthalten sind, durch Reduzieren von diesen mit Ammoniak an einem Katalysator zu harmlosen Komponenten um. Ammoniak wird aus in einem Tank enthaltenen Harnstoffwasser ausgebildet und in ein Abgasrohr eingespritzt. Das in dem Tank enthaltene Harnstoffwasser wird durch eine Rührvorrichtung gerührt, um dessen Temperatur und Dichte in dem Tank gleichmäßig zu machen, wodurch ein teilweises Gefrieren des Harnstoffwassers in dem Tank verhindert wird. Das Harnstoffwasser kann zusätzlich zu dem Rühren von diesem erwärmt werden, wodurch ein Gefrieren des Harnstoffwassers sicher verhindert wird. Die Rührvorrichtung und die Heizeinrichtung können betrieben werden, während Bedingungen einer bordeigenen Batterie kontrolliert werden, um ein Aufbrauchen einer Batterieleistung zu verhindern. Gemäß der vorliegenden Erfindung wird das Harnstoffwasser mit einer gleichmäßigen Dichte in das Abgasrohr zugeführt.A Exhaust gas purification device of the present invention converts nitrogen oxides, which are contained in the exhaust gas of an internal combustion engine, by reducing from these with ammonia on a catalyst to harmless components around. Ammonia is formed from urea water contained in a tank and injected into an exhaust pipe. The urea water contained in the tank is stirred by a stirrer to its Temperature and density in the tank evenly making a partial freezing of the urea water in the tank is prevented. The urea water may additionally are heated to the stirring of this, thereby a freezing of the urea water is reliably prevented. The stirring device and the heater can be operated while conditions an on-board battery to be consumed to prevent battery power. According to the The present invention will provide urea water having a uniform density fed into the exhaust pipe.
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - JP 2004-324651 A [0004] - JP 2004-324651 A [0004]
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2007-131478 | 2007-05-17 | ||
JP2007131478A JP2008286096A (en) | 2007-05-17 | 2007-05-17 | Exhaust gas after treatment device for internal combustion engine |
Publications (1)
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DE102008000549A1 true DE102008000549A1 (en) | 2008-11-27 |
Family
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DE102008000549A Withdrawn DE102008000549A1 (en) | 2007-05-17 | 2008-03-06 | Exhaust gas post processing apparatus for internal combustion engine of vehicle, has stirring operation control part controlling stirring operation of aqueous solution based on freezing monitoring information from freezing monitoring part |
Country Status (2)
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JP (1) | JP2008286096A (en) |
DE (1) | DE102008000549A1 (en) |
Cited By (9)
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EP2080874A3 (en) * | 2008-01-18 | 2010-02-24 | DBK David + Baader GmbH | Tank extracting system with electric and fluid heating device |
WO2012041883A1 (en) * | 2010-10-01 | 2012-04-05 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Reducing-agent tank with temperature sensor |
EP2549072A1 (en) * | 2011-07-20 | 2013-01-23 | Inergy Automotive Systems Research (Société Anonyme) | Vehicular fluid injection system, controller and method for heating said fluid injection system |
WO2013141780A1 (en) | 2012-03-20 | 2013-09-26 | Scania Cv Ab | Method pertaining to an scr system and an scr system |
DE102012104551A1 (en) * | 2012-05-25 | 2013-11-28 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Container for tank for storage of e.g. urea water solution in passenger car, has housing with heating device, and drivable apparatus provided for conveying of convection in housing, where heating device comprises heating element in housing |
US9476336B2 (en) | 2012-05-25 | 2016-10-25 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Container having a heating device for a tank for storing a liquid additive and motor vehicle having a tank |
DE102015217763A1 (en) * | 2015-09-16 | 2017-03-16 | Röchling Automotive SE & Co. KG | Tank for storage and delivery of liquids with functional components arranged on the tank wall |
EP3643893A1 (en) * | 2018-10-26 | 2020-04-29 | MAN Truck & Bus SE | Device for storing and providing an operating means of a motor vehicle |
DE102014206213B4 (en) | 2013-04-02 | 2022-01-13 | Denso Corporation | CONTROL UNIT FOR A UREA WATER ADDITIONAL DEVICE |
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JP5176974B2 (en) * | 2009-01-19 | 2013-04-03 | マツダ株式会社 | Engine exhaust purification system |
DE102010024021A1 (en) * | 2010-06-16 | 2011-12-22 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Device for providing a reducing agent with system heating |
US9797288B2 (en) * | 2010-07-08 | 2017-10-24 | GM Global Technology Operations LLC | Method of operating a vehicle under frozen diesel emission fluid conditions |
US9222388B2 (en) | 2013-02-28 | 2015-12-29 | Tenneco Automotive Operating Company Inc. | Urea common rail |
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JP6693408B2 (en) | 2016-12-22 | 2020-05-13 | 株式会社デンソー | Urea water stirring controller |
CN109899137B (en) * | 2019-04-12 | 2023-12-01 | 无锡威孚力达催化净化器有限责任公司 | Control method and device for removing urea crystals by SCR system |
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US8301020B2 (en) | 2008-01-18 | 2012-10-30 | Dbk David + Baader Gmbh | Tank withdrawal system with electric and fluidic heating device |
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US9097164B2 (en) | 2010-10-01 | 2015-08-04 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Device for providing a liquid reducing agent having a tank with a temperature sensor and motor vehicle having the device |
US9708954B2 (en) | 2011-07-20 | 2017-07-18 | Inergy Automotive Systems Research (Societe Anonyme) | Vehicular fluid injection system, controller and method for heating said fluid injection system |
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WO2013011005A1 (en) * | 2011-07-20 | 2013-01-24 | Inergy Automotive Systems Research (Société Anonyme) | Vehicular fluid injection system, controller and method for heating said fluid injection system. |
WO2013141780A1 (en) | 2012-03-20 | 2013-09-26 | Scania Cv Ab | Method pertaining to an scr system and an scr system |
DE102012104551A1 (en) * | 2012-05-25 | 2013-11-28 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Container for tank for storage of e.g. urea water solution in passenger car, has housing with heating device, and drivable apparatus provided for conveying of convection in housing, where heating device comprises heating element in housing |
US9476336B2 (en) | 2012-05-25 | 2016-10-25 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Container having a heating device for a tank for storing a liquid additive and motor vehicle having a tank |
DE102014206213B4 (en) | 2013-04-02 | 2022-01-13 | Denso Corporation | CONTROL UNIT FOR A UREA WATER ADDITIONAL DEVICE |
DE102015217763A1 (en) * | 2015-09-16 | 2017-03-16 | Röchling Automotive SE & Co. KG | Tank for storage and delivery of liquids with functional components arranged on the tank wall |
DE102015217763B4 (en) * | 2015-09-16 | 2021-02-25 | Röchling Automotive SE & Co. KG | Tank for storage and delivery of liquids with functional components arranged on the tank wall |
EP3643893A1 (en) * | 2018-10-26 | 2020-04-29 | MAN Truck & Bus SE | Device for storing and providing an operating means of a motor vehicle |
DE102018126737A1 (en) * | 2018-10-26 | 2020-04-30 | Man Truck & Bus Se | Device for the storage and provision of operating equipment of a motor vehicle |
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