DE102008045958B4 - Reducing agent supply system for an SCR catalytic converter of an internal combustion engine - Google Patents
Reducing agent supply system for an SCR catalytic converter of an internal combustion engine Download PDFInfo
- Publication number
- DE102008045958B4 DE102008045958B4 DE102008045958A DE102008045958A DE102008045958B4 DE 102008045958 B4 DE102008045958 B4 DE 102008045958B4 DE 102008045958 A DE102008045958 A DE 102008045958A DE 102008045958 A DE102008045958 A DE 102008045958A DE 102008045958 B4 DE102008045958 B4 DE 102008045958B4
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- Prior art keywords
- reducing agent
- distribution device
- heat distribution
- hydraulic units
- internal combustion
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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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
- F01N3/2066—Selective catalytic reduction [SCR]
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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
- F01N3/24—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
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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
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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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
Reduktionsmittelzuführsystem (55) für einen SCR-Katalysator (34) einer Brennkraftmaschine, die mindestens aufweist einen Zylinder (Z1) mit einem Brennraum (26) und einen Abgastrakt (14), dem Abgas aus dem Brennraum (26) zuführbar ist und in dem der SCR-Katalysator (34) angeordnet ist, wobei das Reduktionsmittelzuführsystem (55) aufweist – ein Reduktionsmitteleinspritzventil (64) zum Zumessen von Reduktionsmittel in den Abgastrakt (14), und – einen Reduktionsmitteltank (56), aus dem dem Reduktionsmitteleinspritzventil (64) mittels hydraulischer Aggregate (59, 60, 62, 63) Reduktionsmittel zuführbar ist, wobei mindestens zwei der hydraulischen Aggregate (59, 60, 62, 63) thermisch mit einer gemeinsamen Wärmeverteilvorrichtung (66) gekoppelt sind, dadurch gekennzeichnet, dass die gemeinsame Wärmeverteilvorrichtung (66) plattenförmig und in Sandwichbauweise aus mehreren Schichten (68,70) ausgebildet ist und auf der die hydraulischen Aggregate (59, 60, 62, 63) in einer Ebene angeordnet sind.Reducing agent supply (55) for an SCR catalytic converter (34) of an internal combustion engine having at least one cylinder (Z1) with a combustion chamber (26) and an exhaust tract (14), the exhaust gas from the combustion chamber (26) can be supplied and in which SCR catalyst (34) is arranged, wherein the reducing agent supply system (55) - a reducing agent injection valve (64) for metering reducing agent in the exhaust tract (14), and - a reducing agent tank (56) from which the reducing agent injection valve (64) by means of hydraulic Aggregates (59, 60, 62, 63) reductant is fed, wherein at least two of the hydraulic units (59, 60, 62, 63) are thermally coupled to a common heat distribution device (66), characterized in that the common heat distribution device (66) plate-shaped and in sandwich construction of several layers (68,70) is formed and on the hydraulic units (59, 60, 62, 63) in a plane angeo rdnet are.
Description
Die Erfindung betrifft ein Reduktionsmittelzuführsystem für eine Brennkraftmaschine eines Kraftfahrzeugs. Die Brennkraftmaschine umfasst einen Zylinder mit einem Brennraum und einen Abgastrakt. Der Abgastrakt kommuniziert abhängig von einer Schaltstellung eines Gasauslassventils mit dem Brennraum. Das Reduktionsmittelzuführsystem umfasst ein Reduktionsmitteleinspritzventil zum Zumessen von Reduktionsmittel in den Abgastrakt. Ferner umfasst das Reduktionsmittelzuführsystem einen Reduktionsmitteltank, aus dem über eine Reduktionsmittelleitung Reduktionsmittel zu dem Reduktionsmitteleinspritzventil geleitet werden kann.The invention relates to a reducing agent supply system for an internal combustion engine of a motor vehicle. 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 reductant delivery system includes a reductant injection valve for metering reductant into the exhaust tract. Furthermore, the reducing agent supply system comprises a reducing agent tank from which reducing agent can be passed to the reducing agent injection valve via a reducing agent line.
Zur Reduzierung eines Stickoxidanteils im Abgas einer Brennkraftmaschine kann eine Abgasnachbehandlung mit wässriger Reduktionsmittellösung und einem SCR-Katalysator durchgeführt werden. Die wässrige Reduktionsmittellösung kann auch als Reduktionsmittel bezeichnet werden. Bevorzugt ist das Reduktionsmittel Harnstoff. Zur Abgasnachbehandlung wird die wässrige Reduktionsmittellösung mit einer Flüssigkeitspumpe zu einem Reduktionsmitteleinspritzventil gepumpt, das die Reduktionsmittellösung stromaufwärts des SCR-Katalysators in einen Abgasstrom in einem Abgastrakt der Brennkraftmaschine zumisst. Die Reduktionsmittellösung reagiert in dem heißen Abgasstrom bevorzugt 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 reducing agent solution and an SCR catalyst can be carried out. The aqueous reducing agent solution may also be referred to as a reducing agent. Preferably, the reducing agent is urea. For exhaust aftertreatment, the aqueous reductant solution is pumped with a liquid pump to a reductant injector which meters the reductant solution upstream of the SCR catalyst into an exhaust stream in an exhaust tract of the internal combustion engine. The reducing agent solution reacts in the hot exhaust gas stream preferably 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.
In der
Aus der
Die Aufgabe der Erfindung ist, ein Reduktionsmittelzuführsystem zu schaffen, das ein besonders sicheres Zumessen von Reduktionsmittel in einen Abgastrakt einer Brennkraftmaschine ermöglicht.The object of the invention is to provide a Reduktionsmittelzuführsystem that allows a particularly safe metering of reducing agent in an exhaust tract of an internal combustion engine.
Die Aufgabe wird gelöst durch die Merkmale des unabhängigen Anspruchs. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.The object is solved by the features of the independent claim. Advantageous embodiments of the invention are specified in the subclaims.
Die Erfindung zeichnet sich aus durch ein Reduktionsmittelzuführsystem für einen SCR-Katalysator einer Brennkraftmaschine. Die Brennkraftmaschine umfasst mindestens einen Zylinder mit einem Brennraum und einen Abgastrakt, dem Abgas aus dem Brennraum zuführbar ist und in dem der SCR-Katalysator angeordnet ist. Das Reduktionsmittelzuführsystem weist auf ein Reduktionsmitteleinspritzventil zum Zumessen von Reduktionsmittel in den Abgastrakt, und einen Reduktionsmitteltank, aus dem dem Reduktionsmitteleinspritzventil mittels hydraulischer Aggregate Reduktionsmittel zuführbar ist. Mindestens zwei der hydraulischen Aggregate sind thermisch mit einer gemeinsamen Wärmeverteilvorrichtung gekoppelt. Die Wärmeverteilvorrichtung ist dabei plattenförmig und in Sandwich-Bauweise aus mehreren Schichten ausgebildet. Dies ermöglicht eine Beheizung der hydraulischen Aggregate über eine geometrisch einfach aufgebaute Platte, auf der die hydraulischen Aggregate in einfacher Weise montiert sind.The invention is characterized by a reducing agent supply system for an SCR catalytic converter of an internal combustion engine. The internal combustion engine comprises at least one cylinder with a combustion chamber and an exhaust tract, the exhaust gas from the combustion chamber can be supplied and in which the SCR catalyst is arranged. The reducing agent supply system has a reducing agent injection valve for metering reducing agent into the exhaust gas tract, and a reducing agent tank, from which reducing agent can be fed to the reducing agent injection valve by means of hydraulic units. At least two of the hydraulic units are thermally coupled to a common heat distribution device. The heat distribution device is plate-shaped and formed in sandwich construction of several layers. This allows heating of the hydraulic units via a geometrically simple plate on which the hydraulic units are mounted in a simple manner.
Dies hat den Vorteil, dass eine Verteilung der Heizenergie von einer gemeinsamen mit der Wärmeverteilvorrichtung gekoppelt Heizquelle auf die hydraulischen Aggregate möglich ist. Es sind somit keine Einzelheizungen für die jeweiligen hydraulischen Aggregate erforderlich. Die Kosten für die Komponenten des Reduktionsmittelzuführsystems sowie die Betriebskosten für den SCR-Katalysator können damit gering sein.This has the advantage that a distribution of the heating energy from a common heat source coupled to the heat source to the hydraulic units is possible. Thus, no individual heaters for the respective hydraulic units are required. The cost of the components of the Reduktionsmittelzuführsystems and the operating costs for the SCR catalyst can thus be low.
Durch die Gestaltung der Wärmeverteilvorrichtung in Sandwichbauweise aus mehreren Schichten ist ein einfacher Aufbau der gemeinsamen Wärmeverteilvorrichtung für mehrere hydraulische Aggregate möglich.Due to the design of the heat distribution device in sandwich construction of several layers, a simple construction of the common heat distribution device for a plurality of hydraulic units is possible.
In einer bevorzugten Ausführungsform weist die Wärmeverteilvorrichtung eine erste Schicht aufweist, die aus einem Material gebildet ist, das ein Metall umfasst, und ausgebildet ist zur thermischen Kopplung der mindestens zwei hydraulischen Aggregate mit der gemeinsamen Wärmeverteilvorrichtung. Damit ist eine gute Wärmeleitung von der Heizquelle über die erste Schicht der gemeinsamen Wärmeverteilvorrichtung zu den hydraulischen Aggregaten möglich.In a preferred embodiment, the heat distribution device comprises a first layer, which is formed of a material comprising a metal, and is formed for thermal Coupling of the at least two hydraulic units with the common heat distribution device. Thus, a good heat conduction from the heat source via the first layer of the common heat distribution device to the hydraulic units is possible.
In einer weiteren bevorzugten Ausführungsform ist die erste Schicht aus einem Material gebildet, das Aluminium aufweist. Durch die gute Wärmeleitfähigkeit von Aluminium ist eine gute Wärmeübertragung von der Heizquelle auf die Wärmeverteilvorrichtung und weiter von der Wärmeverteilvorrichtung auf die hydraulischen Aggregate möglich.In a further preferred embodiment, the first layer is formed of a material comprising aluminum. Due to the good thermal conductivity of aluminum, good heat transfer from the heat source to the heat distribution device and further from the heat distribution device to the hydraulic aggregates is possible.
In einer weiteren bevorzugten Ausführungsform weist die Wärmeverteilvorrichtung eine zweite Schicht auf, die ein Material aufweist, das chemisch inert gegenüber dem Reduktionsmittel ist. Dies ermöglicht eine Führung des Reduktionsmittels in der Wärmeverteilvorrichtung.In a further preferred embodiment, the heat distribution device comprises a second layer comprising a material that is chemically inert to the reducing agent. This allows a guide of the reducing agent in the heat distribution device.
In einer weiteren bevorzugten Ausführungsform weist die zweite Schicht Kanäle auf, die zur Führung des Reduktionsmittels ausgebildet sind. Damit kann eine Führung des Reduktionsmittels zwischen den hydraulischen Aggregaten innerhalb der Wärmeverteilvorrichtung und eine Erwärmung der Wärmeverteilvorrichtung erreicht werden.In a further preferred embodiment, the second layer has channels which are designed to guide the reducing agent. Thus, a guidance of the reducing agent between the hydraulic units within the heat distribution device and a heating of the heat distribution device can be achieved.
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 gekennzeichnetElements of the same construction or function are identified across the figures with the same reference numerals
In
Der Zylinderkopf
In dem Abgastrakt
Die Brennkraftmaschine weist ferner eine Steuervorrichtung
Die Sensoren umfassen einen Pedalstellungsgeber
Stromaufwärts des Oxidationskatalysators
Ferner ist ein Stickoxidsensor
Ferner ist dem Abgastrakt
Zum Zuführen von Reduktionsmittel ragt das Reduktionsmitteleinspritzventil
Zusätzlich zu dem Katalysator
Stromabwärts des Brennraums
Neben dem Zylinder Z1 sind bevorzugt noch weitere Zylinder Z2 bis Z4 vorgesehen, denen ebenfalls entsprechende Stellglieder und gegebenenfalls Sensoren zugeordnet sind.In addition to the cylinder Z1 further cylinders Z2 to Z4 are preferably provided, which are also associated with corresponding actuators and optionally sensors.
Das Reduktionsmittelzuführsystem
Die Wärmeverteilvorrichtung
Die Wärmeverteilvorrichtung
Die Wärmeverteilvorrichtung
Im Folgenden soll die Funktion der Wärmeverteilvorrichtung
In einer aktiven Heizvorrichtung, beispielsweise einer Filterheizung für den Filter
In an active heater, such as a filter heater for the
Sowohl die weiteren nicht beheizten hydraulischen Aggregate als auch die zweite Schicht
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008045958A DE102008045958B4 (en) | 2008-09-04 | 2008-09-04 | Reducing agent supply system for an SCR catalytic converter of an internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008045958A DE102008045958B4 (en) | 2008-09-04 | 2008-09-04 | Reducing agent supply system for an SCR catalytic converter of an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE102008045958A1 DE102008045958A1 (en) | 2010-03-11 |
| DE102008045958B4 true DE102008045958B4 (en) | 2013-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE102008045958A Active DE102008045958B4 (en) | 2008-09-04 | 2008-09-04 | Reducing agent supply system for an SCR catalytic converter of an internal combustion engine |
Country Status (1)
| Country | Link |
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| DE (1) | DE102008045958B4 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009041179A1 (en) * | 2009-09-11 | 2011-03-24 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Delivery device for a reducing agent |
| DE102010007564B4 (en) * | 2010-02-10 | 2022-12-29 | Albonair Gmbh | Metering system for injecting a reducing agent into the exhaust gas stream of a combustion engine |
| DE102010024022B4 (en) | 2010-06-16 | 2025-03-27 | Vitesco Technologies GmbH | Device for conveying liquid reducing agent |
| DE202010018571U1 (en) * | 2010-07-26 | 2017-10-05 | Albonair Gmbh | Dosing system for injecting a reducing agent in the exhaust stream of an internal combustion engine |
| FR2971006B1 (en) * | 2011-01-31 | 2015-04-17 | Coutier Moulage Gen Ind | DISTRIBUTION MODULE FOR ADDITIVE TO BE INJECTED IN AN EXHAUST LINE |
| DE102011010640A1 (en) * | 2011-02-09 | 2012-08-09 | Emitec France S.A.S | Feed unit for conveying reducing agent |
| DE102012109675A1 (en) * | 2012-10-11 | 2014-04-30 | Emitec Denmark A/S | Device for providing a liquid additive |
| DE102014019021B4 (en) * | 2014-12-18 | 2023-02-02 | Woodward L'orange Gmbh | reducing agent dosing unit |
| DE102015015714A1 (en) * | 2015-12-07 | 2017-06-08 | Albonair Gmbh | Scalable reducing agent dosing system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004062014A1 (en) * | 2004-12-23 | 2006-07-27 | Robert Bosch Gmbh | Method and device for an exhaust gas purification system |
| DE102006061736A1 (en) * | 2006-12-28 | 2008-07-03 | Robert Bosch Gmbh | Delivery module for selective catalytic reduction |
-
2008
- 2008-09-04 DE DE102008045958A patent/DE102008045958B4/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004062014A1 (en) * | 2004-12-23 | 2006-07-27 | Robert Bosch Gmbh | Method and device for an exhaust gas purification system |
| DE102006061736A1 (en) * | 2006-12-28 | 2008-07-03 | Robert Bosch Gmbh | Delivery module for selective catalytic reduction |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008045958A1 (en) | 2010-03-11 |
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