DE10349143B4 - dosing - Google Patents
dosing Download PDFInfo
- Publication number
- DE10349143B4 DE10349143B4 DE10349143A DE10349143A DE10349143B4 DE 10349143 B4 DE10349143 B4 DE 10349143B4 DE 10349143 A DE10349143 A DE 10349143A DE 10349143 A DE10349143 A DE 10349143A DE 10349143 B4 DE10349143 B4 DE 10349143B4
- Authority
- DE
- Germany
- Prior art keywords
- reducing agent
- pressure sensor
- metering
- pressure
- dosing unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; 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
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8696—Controlling the catalytic process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- 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
- F01N2610/10—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
-
- 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
- F01N2610/148—Arrangement of sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Dosiereinheit
(1) zum Zumessen eines Reduktionsmittels in eine Abgasleitung stromaufwärts eines
SCR-Katalysators, umfassend
– einen den Reduktionsmitteldruck
in der Dosiereinheit erfassenden Drucksensor (2),
– einen
Reduktionsmittelkanal (5) und
– ein Dosierventil (8) zur
Dosierung des Reduktionsmittels,
wobei ein den Drucksensor
(2) mit dem Reduktionsmittelkanal (5) verbindendes Ausgleichselement
(3) mit einem druckabhängigen
Innenvolumen zur Frostkompensation vorgesehen ist.Dosing unit (1) for metering a reducing agent into an exhaust pipe upstream of an SCR catalyst, comprising
A pressure sensor (2) detecting the reducing agent pressure in the dosing unit,
- A reducing agent channel (5) and
A metering valve (8) for metering the reducing agent,
wherein a the pressure sensor (2) with the reducing agent channel (5) connecting compensating element (3) is provided with a pressure-dependent internal volume for frost compensation.
Description
Die Erfindung betrifft eine Dosiereinheit zum Zumessen eines Reduktionsmittels, mit einem den Reduktionsmitteldruck in der Dosiereinheit erfassenden Drucksensor.The Invention relates to a metering unit for metering a reducing agent, with a detecting the reducing agent pressure in the metering unit Pressure sensor.
Aus
der
Aus
der
In
der
In
der
Aus
der
Die Verminderung der Stickoxidemission einer mit Luftüberschuss arbeitenden Brennkraftmaschine, insbesondere einer Diesel-Brennkraftmaschine, kann mit Hilfe des SCR-Verfahrens (Selektive Katalytische Reduktion) zu Stickstoff und wasserdampf erfolgen. Als Reduktionsmittel werden entweder gasförmiges Ammoniak (NH3), Ammoniak in wässriger Lösung oder Ammoniumcarbamat, Ammoniumcarbonat oder Cyanursäure, als Festsubstanz oder in wässriger Lösung eingesetzt. Dem Vorteil der einfacheren Handhabung, Bevorratung, Förder- und Dosierbarkeit von wässrigen Lösungen im Gegensatz zu gasförmigen Substanzen steht als Nachteil die Gefahr des Einfrierens bei bestimmten Temperaturen in Abhängigkeit der Konzentration der gelösten Substanz gegenüber.The reduction of the nitrogen oxide emission of an internal combustion engine operating with excess air, in particular a diesel internal combustion engine, can be carried out with the aid of the SCR process (selective catalytic reduction) to nitrogen and water vapor. As a reducing agent either gaseous ammonia (NH 3 ), ammonia in aqueous solution or ammonium carbamate, ammonium carbonate or cyanuric acid, used as a solid or in aqueous solution. The advantage of easier handling, storage, delivery and metering of aqueous solutions in contrast to gaseous substances stands as a disadvantage against the risk of freezing at certain temperatures as a function of the concentration of the dissolved substance.
Eine 32%ige Harnstofflösung, wie sie typischerweise in SCR-Systemen als Reduktionsmittel verwendet wird, weist einen Gefrierpunkt von etwa –11°C auf. Dabei erhöht sich das Volumen beim Phasenübergang von flüssig nach fest ähnlich wie bei Wasser um ca. 10%.A 32% urea solution, as typically in SCR systems is used as a reducing agent, has a freezing point of about -11 ° C. there elevated the volume at the phase transition from liquid after firmly similar as with water by about 10%.
Der Erfindung liegt als technisches Problem die Bereitstellung einer Dosiereinheit der eingangs genannten Art zugrunde, die mit vergleichsweise geringem Aufwand realisierbar ist und dabei eine Beschädigung des in der Dosiereinheit enthaltenen Drucksensors bei Einfrieren der Reduktionsmittellösung wirkungsvoll verhindert.Of the Invention is the technical problem of providing a Dosing unit of the type mentioned, with comparatively little effort is feasible and doing damage to the in the metering unit contained pressure sensor when freezing the Reducing Agent Solution effectively prevented.
Die Erfindung löst dieses Problem durch die Bereitstellung einer Dosiereinheit mit den Merkmalen des Anspruchs 1. Die erfindungsgemäße Dosiereinheit weist einen den Reduktionsmitteldruck in der Dosiereinheit erfassenden Drucksensor und einen Reduktionsmittelkanal auf. Zur Frostkompensation ist ein den Drucksensor mit dem Reduktionsmittelkanal verbindendes Ausgleichselement vorgesehen.The Invention solves this problem by providing a dosing unit with the features of claim 1. The dosing unit according to the invention has a the reducing agent pressure in the metering unit detecting pressure sensor and a reductant channel. For frost compensation is a the pressure sensor with the reducing agent channel connecting compensation element intended.
In einer nach Anspruch 2 weitergebildeten Dosiereinheit enthält das Ausgleichselement ein Edelstahl-Flexrohr.In a further developed according to claim 2 metering unit contains the compensation element a stainless steel flexible tube.
In einer alternativen Weiterbildung nach Anspruch 3 enthält das Ausgleichselement eine elastische Schlauchverbindung.In An alternative development according to claim 3 contains the compensation element an elastic hose connection.
In einer Weiterbildung der Erfindung nach Anspruch 4 enthält die elastische Schlauchverbindung EPDM (Ethylen-Propylen-Dien-Copolymer).In a development of the invention according to claim 4 contains the elastic Hose connection EPDM (ethylene-propylene-diene copolymer).
Beide Materialien, das Edelstahl-Flexrohr wie auch die elastische Schlauchverbindung, weisen aufgrund ihrer elastischen Eigenschaften ein bestimmtes Ausdehnungsvolumen auf. Jedes andere Material, welches elastische Eigenschaften, Alterungs- und Korrosionsbeständigkeit im Hinblick auf die verwendete wässrige Reduktionsmittellösung aufweist, kann zur Schaffung eines solchen Ausdehnungsvolumens ebenso in einem Ausgleichselement Einsatz finden.Both Materials, the stainless steel flexible tube as well as the flexible hose connection, have a certain expansion volume due to their elastic properties on. Any other material which has elastic properties, aging and corrosion resistance with regard to the aqueous used Having a reducing agent solution, can be used to create such an expansion volume as well Find compensating element insert.
In einer bevorzugten Weiterbildung nach Anspruch 5 ist das Ausgleichselement mit einer Heizvorrichtung ausgestattet.In A preferred embodiment according to claim 5 is the compensation element equipped with a heating device.
Vorteilhafte Ausgestaltungen der erfindungsgemäßen Dosiereinheit sind Gegenstand der Unteransprüche und der Beschreibung.advantageous Embodiments of the dosing unit according to the invention are the subject the dependent claims and the description.
Die Erfindung wird nun anhand der beigefügten Zeichnung weiter beschrieben. In dieser zeigt auf schematische WeiseThe Invention will now be described with reference to the accompanying drawings. In this shows in a schematic way
In
Um
beim Einfrieren des wässrigen
Reduktionsmittels in den Kanälen
oder Leitungen des Dosierventils
Die
Dosiereinheit
Eine
Entlastung des Drucksensors
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10349143A DE10349143B4 (en) | 2003-10-17 | 2003-10-17 | dosing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10349143A DE10349143B4 (en) | 2003-10-17 | 2003-10-17 | dosing |
Publications (2)
Publication Number | Publication Date |
---|---|
DE10349143A1 DE10349143A1 (en) | 2005-05-19 |
DE10349143B4 true DE10349143B4 (en) | 2006-05-24 |
Family
ID=34442201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10349143A Expired - Lifetime DE10349143B4 (en) | 2003-10-17 | 2003-10-17 | dosing |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10349143B4 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013101720A1 (en) | 2013-02-21 | 2014-08-21 | Bernd Giegerich | Protective element for component exposed to liquid freezing such as freezing pressure formation, has cap with outer sealing edge and central portion, where cap is made of elastomer-containing material, particularly elastomer or plastic |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005039085B3 (en) * | 2005-08-04 | 2006-12-21 | Danfoss Industrieautomatik Gmbh | Fueling system for vehicle, has safety stop valve including housing with surfaces, which are formed from metallic base material, where surfaces are coated with carrier layer, which is further coated with protective layer of zinc |
DE102007026892A1 (en) * | 2007-06-11 | 2008-12-18 | Robert Bosch Gmbh | Device for the metered injection of a liquid exhaust aftertreatment agent |
DE102007039424A1 (en) | 2007-08-21 | 2009-02-26 | Eberspächer Unna GmbH & Co. KG | Reducing agent supply system for exhaust gas after-treatment device in internal-combustion engine i.e. diesel engine, has extension element that is formed as folded bellow element and integrated into reducing agent line |
DE102011078528B4 (en) | 2011-07-01 | 2024-06-06 | Robert Bosch Gmbh | Ice pressure compensation line |
SE1250265A1 (en) * | 2012-03-20 | 2013-09-21 | Scania Cv Ab | Procedure for an SCR system and an SCR system |
DE102012010979A1 (en) * | 2012-06-02 | 2013-12-05 | Hydac Electronic Gmbh | System for exhaust aftertreatment in internal combustion engines |
DE112014006732T5 (en) | 2014-06-11 | 2017-05-11 | Tenneco Automotive Operating Company Inc. | Fluid supply system with line pressure control valve |
CN204267137U (en) * | 2014-11-14 | 2015-04-15 | 天纳克(苏州)排放系统有限公司 | Sensor integrated device |
US10202883B2 (en) | 2014-11-21 | 2019-02-12 | Tenneco (Suzhou) Emission System Co., Ltd. | Common rail assembly, urea injection system and application thereof |
CN105673154B (en) | 2014-11-21 | 2019-11-08 | 天纳克(苏州)排放系统有限公司 | Common rail, the application of the common rail, urea injection system and its control method |
CN106194706B (en) * | 2016-09-22 | 2018-09-28 | 凯龙高科技股份有限公司 | A kind of pressure switch with damping hole |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19517676A1 (en) * | 1995-05-13 | 1996-11-14 | Bosch Gmbh Robert | Pressure sensor for internal combustion engine with induction manifold pipe |
DE19934832A1 (en) * | 1999-07-24 | 2001-01-25 | Bosch Gmbh Robert | Pressure sensor for IC engine air intake pipe has anti-freeze fluid in section of sensor channel coupling pressure sensor to air intake pipe closest to sensor surface |
DE10004614A1 (en) * | 2000-02-03 | 2001-08-16 | Siemens Ag | Liquid pressure sensor esp. for detecting reducing agent solution pressure for exhaust-gas treatment in combustion engine - includes spring element for holding pressure sensor element in defined position in receptacle part for pressure sensor element |
DE10023589A1 (en) * | 2000-05-13 | 2001-11-29 | Bosch Gmbh Robert | Freeze-resistant pressure sensor |
DE10161132A1 (en) * | 2001-12-12 | 2003-06-26 | Siemens Ag | Diaphragm pump with integrated pressure sensor |
-
2003
- 2003-10-17 DE DE10349143A patent/DE10349143B4/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19517676A1 (en) * | 1995-05-13 | 1996-11-14 | Bosch Gmbh Robert | Pressure sensor for internal combustion engine with induction manifold pipe |
DE19934832A1 (en) * | 1999-07-24 | 2001-01-25 | Bosch Gmbh Robert | Pressure sensor for IC engine air intake pipe has anti-freeze fluid in section of sensor channel coupling pressure sensor to air intake pipe closest to sensor surface |
DE10004614A1 (en) * | 2000-02-03 | 2001-08-16 | Siemens Ag | Liquid pressure sensor esp. for detecting reducing agent solution pressure for exhaust-gas treatment in combustion engine - includes spring element for holding pressure sensor element in defined position in receptacle part for pressure sensor element |
DE10023589A1 (en) * | 2000-05-13 | 2001-11-29 | Bosch Gmbh Robert | Freeze-resistant pressure sensor |
DE10161132A1 (en) * | 2001-12-12 | 2003-06-26 | Siemens Ag | Diaphragm pump with integrated pressure sensor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013101720A1 (en) | 2013-02-21 | 2014-08-21 | Bernd Giegerich | Protective element for component exposed to liquid freezing such as freezing pressure formation, has cap with outer sealing edge and central portion, where cap is made of elastomer-containing material, particularly elastomer or plastic |
Also Published As
Publication number | Publication date |
---|---|
DE10349143A1 (en) | 2005-05-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
OP8 | Request for examination as to paragraph 44 patent law | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: DAIMLERCHRYSLER AG, 70327 STUTTGART, DE |
|
8327 | Change in the person/name/address of the patent owner |
Owner name: DAIMLER AG, 70327 STUTTGART, DE |
|
R081 | Change of applicant/patentee |
Owner name: MERCEDES-BENZ GROUP AG, DE Free format text: FORMER OWNER: DAIMLER AG, 70327 STUTTGART, DE Owner name: DAIMLER AG, DE Free format text: FORMER OWNER: DAIMLER AG, 70327 STUTTGART, DE |
|
R081 | Change of applicant/patentee |
Owner name: MERCEDES-BENZ GROUP AG, DE Free format text: FORMER OWNER: DAIMLER AG, STUTTGART, DE |
|
R071 | Expiry of right |