DE102007026944B4 - Urea metering system for an internal combustion engine - Google Patents
Urea metering system for an internal combustion engine Download PDFInfo
- Publication number
- DE102007026944B4 DE102007026944B4 DE102007026944A DE102007026944A DE102007026944B4 DE 102007026944 B4 DE102007026944 B4 DE 102007026944B4 DE 102007026944 A DE102007026944 A DE 102007026944A DE 102007026944 A DE102007026944 A DE 102007026944A DE 102007026944 B4 DE102007026944 B4 DE 102007026944B4
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- Prior art keywords
- urea
- tank
- line
- air compressor
- injection valve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—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
- F01N2610/1406—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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1466—Means for venting air out of conduits or tanks
-
- 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
-
- 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
- F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
-
- 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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- 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
Harnstoffzumesssystem für eine Brennkraftmaschine (14), die mindestens einen Zylinder (Z1) mit einem Brennraum (9) und einen Abgastrakt (4) umfasst, der abhängig von einer Schaltstellung eines Gasauslassventils (13) mit dem Brennraum (9) kommuniziert, wobei das Harnstoffzumesssystem
– ein mittels Signale ansteuerbares, in den Abgastrakt (4) hineinragendes Harnstoffeinspritzventil (54) zum Zumessen von Harnstoff in den Abgastrakt (4) umfasst,
– einen Harnstofftank (40) umfasst, aus dem über eine Harnstoffleitung (41) Harnstoff zu dem Harnstoffeinspritzventil (54) geleitet werden kann,
– einen Luftverdichter (50) umfasst, der so mit dem Harnstofftank (40) gekoppelt ist, dass mit dem Luftverdichter (50) ein Überdruck in dem Harnstofftank (40) erzeugt werden kann, und
– eine von der Harnstoffleitung (41) separate Entlüftungsleitung (56) umfasst, die zum Spülen der Harnstoffleitung (41) mit dem Luftverdichter (50) und dem Harnstoffeinspritzventil (54) gekoppelt ist.A urea metering system for an internal combustion engine (14) comprising at least one cylinder (Z1) with a combustion chamber (9) and an exhaust tract (4) which communicates with the combustion chamber (9) depending on a switching position of a gas outlet valve (13), the urea metering system
Comprising a urea injection valve (54), which can be activated by means of signals and projects into the exhaust gas tract (4), for metering urea into the exhaust gas tract (4),
Comprising a urea tank (40) from which urea can be passed to the urea injection valve (54) via a urea line (41),
- An air compressor (50) which is coupled to the urea tank (40) that with the air compressor (50), an overpressure in the urea tank (40) can be generated, and
- One of the urea line (41) separate vent line (56) which is coupled for flushing the urea line (41) with the air compressor (50) and the urea injection valve (54).
Description
Die Erfindung betrifft ein Harnstoffzumesssystem für eine Brennkraftmaschine. Die Brennkraftmaschine umfasst einen Zylinder mit einem Brennraum und einen Abgastrakt. Der Abgastrakt kommuniziert abhängig von einer Schaltstellung eines Gasauslassventils mit dem Brennraum. Das Harnstoffzumesssystem umfasst ein Harnstoffeinspritzventil zum Zumessen von Harnstoff in den Abgastrakt. Ferner umfasst das Harnstoffzumesssystem einen Harnstofftank, aus dem über eine Harnstoffleitung Harnstoff zu dem Harnstoffeinspritzventil geleitet werden kann.The invention relates to a urea metering system for an internal combustion engine. The internal combustion engine comprises a cylinder with a combustion chamber and an exhaust tract. The exhaust tract communicates with the combustion chamber depending on a switching position of a gas outlet valve. The urea metering system includes a urea injector for metering urea into the exhaust tract. Furthermore, the urea-metering system comprises a urea tank, from which urea can be passed to the urea injection valve via a urea line.
Zur Reduzierung eines Stickoxidanteils im Abgas einer Brennkraftmaschine kann eine Abgasnachbehandlung mit wässriger Harnstofflösung und einem SCR-Katalysator durchgeführt werden. Die wässrige Harnstofflösung kann auch als Harnstoff bezeichnet werden. Zur Abgasnachbehandlung wird die wässrige Harnstofflösung mit einer Flüssigkeitspumpe zu einem Harnstoffeinspritzventil gepumpt, das die Harnstofflösung stromaufwärts des SCR-Katalysators in einen Abgasstrom in einem Abgastrakt der Brennkraftmaschine zumisst. Die Harnstofflösung reagiert in dem heißen Abgasstrom zu Ammoniak und Kohlendioxid. In dem SCR-Katalysator reagiert dann der Ammoniak mit dem Stickoxidgemisch des Abgases zu Stickstoff und Wasser.To reduce a proportion of nitrogen oxide in the exhaust gas of an internal combustion engine, an exhaust gas aftertreatment with aqueous urea solution and an SCR catalyst can be carried out. The aqueous urea solution may also be referred to as urea. For exhaust aftertreatment, the aqueous urea solution is pumped with a liquid pump to a urea injection valve which meters the urea solution upstream of the SCR catalyst into an exhaust gas stream in an exhaust tract of the internal combustion engine. The urea solution reacts in the hot exhaust stream to ammonia and carbon dioxide. In the SCR catalyst, the ammonia then reacts with the nitrogen oxide mixture of the exhaust gas to form nitrogen and water.
Die Aufgabe der Erfindung ist ein Harnstoffzumesssystem zu schaffen, das ein besonders günstiges Zumessen von Harnstoff in einen Abgastrakt einer Brennkraftmaschine ermöglicht.The object of the invention is to provide a urea metering system which allows a particularly favorable metering of urea into an exhaust tract of an internal combustion engine.
Die Aufgabe wird gelöst durch die Merkmale des unabhängigen Anspruchs. The object is solved by the features of the independent claim.
Die Erfindung zeichnet sich aus durch ein Harnstoffzumesssystem für eine Brennkraftmaschine. Die Brennkraftmaschine umfasst mindestens einen Zylinder mit einem Brennraum und einen Abgastrakt. Der Abgastrakt kommuniziert abhängig von einer Schaltstellung eines Gasauslassventils mit dem Brennraum. Das Harnstoffzumesssystem umfasst ein mittels Signale ansteuerbares, in den Abgastrakt ragendes Harnstoffeinspritzventil zum Zumessen von Harnstoff in den Abgastrakt, einen Harnstofftank und einen Luftverdichter. Aus dem Harnstofftank kann über eine Harnstoffleitung Harnstoff zu dem Harnstoffeinspritzventil geleitet werden. Der Luftverdichter ist so mit dem Harnstofftank gekoppelt, dass mit dem Luftverdichter ein Überdruck in dem Harnstofftank erzeugt werden kann. Ferner ist eine, von der Harnstoffleitung separate Entlüftungsleitung vorgesehen, die zum Spülen der Harnstoffleitung mit dem Luftverdichter und de Harnstoffeinspritzventil gekoppelt ist.The invention is characterized by a urea metering system for an internal combustion engine. The internal combustion engine comprises at least one cylinder with a combustion chamber and an exhaust gas tract. The exhaust tract communicates with the combustion chamber depending on a switching position of a gas outlet valve. The urea-metering system comprises a signal-controllable urea injection valve projecting into the exhaust tract for metering urea into the exhaust-gas tract, a urea tank and an air compressor. From the urea tank urea can be directed to the urea injection valve via a urea line. The air compressor is coupled to the urea tank so that an overpressure in the urea tank can be created with the air compressor. Further, a separate from the urea line vent line is provided, which is coupled for flushing the urea line with the air compressor and de urea injection valve.
Der Überdruck in dem Harnstofftank kann beispielsweise gegenüber einem Umgebungsluftdruck des Harnstofftanks erzeugt werden und/oder gegenüber einem Luftdruck in dem Abgastrakt, in den der Harnstoff zugemessen wird.The overpressure in the urea tank may be generated, for example, against an ambient air pressure of the urea tank and / or against an air pressure in the exhaust tract into which the urea is metered.
Dies trägt zu einem einfachen Zumessen des Harnstoffs in den Abgastrakt bei. Ferner kann das unter Druck Setzen des Harnstofftanks dazu beitragen, dass der Harnstofftank dicht verschließbar ist. Ferner kann der Harnstofftank als Druckspeicher dienen und so eine Laufzeit des Luftverdichters zum Erzeugen des Drucks verkürzen. Dies kann dazu beitragen, den Luftverdichter mit einer 2-Punkt-Regelung zu betreiben. Der Harnstofftank kann mit einem Druck von beispielsweise bis zu 8 bar beaufschlagt werden. This contributes to easy metering of the urea into the exhaust tract. Further, pressurizing the urea tank can help to seal the urea tank tightly. Furthermore, the urea tank can serve as a pressure accumulator and thus shorten a running time of the air compressor for generating the pressure. This can help operate the air compressor with 2-point control. The urea tank can be subjected to a pressure of, for example, up to 8 bar.
Eine Entlüftungsleitung ist zum Spülen der Harnstoffleitung mit dem Luftverdichter und dem Harnstoffeinspritzventil gekoppelt. Dies kann zu einem zuverlässigen Betrieb des Harnstoffzumesssystems beitragen, beispielsweise kann verhindert werden, dass sich Harnstoff in der Harnstoffleitung zu stark erwärmt und dann gerinnt und/oder dass der Harnstoff sich zu stark abkühlt und gefriert. Sowohl das Gerinnen als auch das Gefrieren des Harnstoffs kann eine Güte der Abgasnachbehandlung mittels des Harnstoffs verringern.A vent line is coupled to flush the urea line with the air compressor and the urea injection valve. This can contribute to a reliable operation of the urea metering system, for example it can be prevented that urea in the urea line heats up too much and then coagulates and / or that the urea cools down too much and freezes. Both the coagulation and the freezing of the urea can reduce a quality of the exhaust aftertreatment by means of the urea.
Das Harnstoffzumesssystem umfasst zum Anschließen einer externen Druckluftleitung einen Druckluftanschluss. Der Druckluftanschluss ist mit dem Luftverdichter gekoppelt. An dem Druckluftanschluss kann beispielsweise ein Aufsatz zum Aufpumpen beispielsweise eines Autoreifens und/oder eines Schlauchbootes aufgesetzt werden. Dies ermöglicht, den Luftverdichter außerhalb des regulären Betriebs des Harnstoffzumesssystems vorteilhaft zu nutzen.The urea metering system includes a compressed air connection for connecting an external compressed air line. The compressed air connection is coupled to the air compressor. At the compressed air connection, for example, an attachment for inflating, for example, a car tire and / or a dinghy can be placed. This makes it possible to make advantageous use of the air compressor outside of the normal operation of the urea metering system.
Ausführungsbeispiele der Erfindung sind im Folgenden anhand von schematischen Zeichnungen näher erläutert.Embodiments of the invention are explained in more detail below with reference to schematic drawings.
Es zeigen:Show it:
Elemente gleicher Konstruktion oder Funktion sind figurenübergreifend mit den gleichen Bezugszeichen gekennzeichnet.Elements of the same construction or function are identified across the figures with the same reference numerals.
Eine Brennkraftmaschine
In dem Zylinderkopf
Der Abgastrakt
Ferner ist dem Abgastrakt
Ferner kann das unter Druck Setzen des Harnstofftanks
Zum Entlüften der Harnstoffleitung
Der Luftverdichter
Eine Steuereinrichtung
Die Sensoren sind beispielsweise ein Pedalstellungsgeber
Je nach Ausführungsform der Erfindung kann eine beliebige Untermenge der genannten Sensoren vorhanden sein oder es können auch zusätzliche Sensoren vorhanden sein.Depending on the embodiment of the invention, any subset of said sensors may be present, or additional sensors may be present.
Die Stellglieder sind beispielsweise die Drosselklappe
Auf einem Speichermedium der Steuereinrichtung
Das Programm wird vorzugsweise in einem Schritt S1 gestartet, indem gegebenenfalls Variablen initialisiert werden.The program is preferably started in a step S1, where variables are initialized if necessary.
In einem Schritt S2 wird während eines Harnstoffzumessvorgangs INJ der Harnstoff dem Abgastrakt
Vorzugsweise wird, beispielsweise wenn die Brennkraftmaschine
Daraufhin wird in einem Schritt S4 vorzugsweise das Entlüftungsventil
In einem Schritt S5 kann das Programm beendet werden. Vorzugsweise wird das Programm regelmäßig während des Betriebs der Brennkraftmaschine
Die Erfindung ist nicht auf die angegebenen Ausführungsbeispiele beschränkt. Beispielsweise kann die Kraftstoffrückführleitung
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007026944A DE102007026944B4 (en) | 2007-06-12 | 2007-06-12 | Urea metering system for an internal combustion engine |
PCT/EP2008/057412 WO2008152105A1 (en) | 2007-06-12 | 2008-06-12 | Urea dosing system for an internal combustion engine and a method and a device for dosing urea using the urea dosing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007026944A DE102007026944B4 (en) | 2007-06-12 | 2007-06-12 | Urea metering system for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
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DE102007026944A1 DE102007026944A1 (en) | 2008-12-24 |
DE102007026944B4 true DE102007026944B4 (en) | 2011-07-28 |
Family
ID=39826859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE102007026944A Active DE102007026944B4 (en) | 2007-06-12 | 2007-06-12 | Urea metering system for an internal combustion engine |
Country Status (2)
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DE (1) | DE102007026944B4 (en) |
WO (1) | WO2008152105A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010005406A1 (en) | 2010-01-22 | 2011-07-28 | Bayerische Motoren Werke Aktiengesellschaft, 80809 | Motor vehicle with a storage tank for reducing agent |
CN102242658A (en) * | 2010-05-10 | 2011-11-16 | 中国第一汽车集团公司无锡油泵油嘴研究所 | Urea injection system by adopting gas pressure source |
CN101975101A (en) * | 2010-10-20 | 2011-02-16 | 中国第一汽车集团公司 | SCR urea system for non-deflation emptying pipeline of pneumatic single-urea box |
CN102451617A (en) * | 2010-10-20 | 2012-05-16 | 中国第一汽车集团公司 | Pneumatic double urea tank electronically-controlled urea loading pump built-in filter SCR (silicon controlled rectifier) urea system |
CN101979131A (en) * | 2010-10-20 | 2011-02-23 | 中国第一汽车集团公司 | Pneumatic dual-urea tank urea one-way valve control water heating silicon controlled rectifier (SCR) urea system |
CN101975102B (en) * | 2010-10-20 | 2016-01-06 | 中国第一汽车集团公司 | Pneumatic single-urea box full-deflating emptying pipeline SCR urea system |
CN101975103A (en) * | 2010-10-20 | 2011-02-16 | 中国第一汽车集团公司 | Electronic-control urea pump water heating SCR urea system of pneumatic double urea box |
DE102011081580A1 (en) * | 2011-03-04 | 2012-09-06 | Robert Bosch Gmbh | Exhaust after-treatment system of an internal combustion engine and method for dosing a liquid in the exhaust passage of the internal combustion engine |
DE102012208936A1 (en) * | 2012-05-29 | 2013-12-05 | Robert Bosch Gmbh | Injection system, exhaust aftertreatment device |
DE102013107373A1 (en) * | 2013-07-11 | 2015-01-15 | Voss Automotive Gmbh | "Method and device for protecting fluid systems against freezing pressure" |
GB201421869D0 (en) * | 2014-12-09 | 2015-01-21 | Delphi International Operations Luxembourg S.�.R.L. | SCR dosing system |
EP3414435A1 (en) * | 2016-02-09 | 2018-12-19 | Kautex Textron GmbH & Co. Kg | System for storing and delivering an auxiliary liquid to an internal combustion engine of a motor vehicle or to parts of the internal combustion engine of the motor vehicle |
DE102018201564A1 (en) * | 2018-02-01 | 2019-08-01 | Bayerische Motoren Werke Aktiengesellschaft | Device for supplying a freeze-endangered liquid into the combustion chambers of an internal combustion engine |
CN113606017A (en) * | 2021-06-30 | 2021-11-05 | 徐工集团工程机械股份有限公司科技分公司 | Loader and delayed power-off control device and control method thereof |
Citations (4)
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DE4432576A1 (en) * | 1994-09-13 | 1996-03-14 | Siemens Ag | Electrically heated assembly delivers fluid to automotive exhaust gases |
EP0839264B1 (en) * | 1994-09-13 | 1999-12-01 | Siemens Aktiengesellschaft | Process and device for introducing a fluid into an exhaust gas purification system |
DE19840404A1 (en) * | 1998-09-04 | 2000-03-09 | Siemens Ag | Process for the catalytic removal of polycyclic aromatic nitro, nitroso and / or amino compounds |
DE10052077A1 (en) * | 2000-10-19 | 2002-05-02 | Hydraulik Ring Gmbh | Device for exhaust gas aftertreatment of diesel engines |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10047842B4 (en) * | 2000-09-27 | 2013-06-06 | Volkswagen Ag | Vehicle with air suspension |
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2007
- 2007-06-12 DE DE102007026944A patent/DE102007026944B4/en active Active
-
2008
- 2008-06-12 WO PCT/EP2008/057412 patent/WO2008152105A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4432576A1 (en) * | 1994-09-13 | 1996-03-14 | Siemens Ag | Electrically heated assembly delivers fluid to automotive exhaust gases |
EP0839264B1 (en) * | 1994-09-13 | 1999-12-01 | Siemens Aktiengesellschaft | Process and device for introducing a fluid into an exhaust gas purification system |
DE19840404A1 (en) * | 1998-09-04 | 2000-03-09 | Siemens Ag | Process for the catalytic removal of polycyclic aromatic nitro, nitroso and / or amino compounds |
DE10052077A1 (en) * | 2000-10-19 | 2002-05-02 | Hydraulik Ring Gmbh | Device for exhaust gas aftertreatment of diesel engines |
Also Published As
Publication number | Publication date |
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DE102007026944A1 (en) | 2008-12-24 |
WO2008152105A1 (en) | 2008-12-18 |
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