CN112996992A - Exhaust gas aftertreatment device and exhaust gas aftertreatment system - Google Patents
Exhaust gas aftertreatment device and exhaust gas aftertreatment system Download PDFInfo
- Publication number
- CN112996992A CN112996992A CN201980072411.2A CN201980072411A CN112996992A CN 112996992 A CN112996992 A CN 112996992A CN 201980072411 A CN201980072411 A CN 201980072411A CN 112996992 A CN112996992 A CN 112996992A
- Authority
- CN
- China
- Prior art keywords
- exhaust gas
- gas aftertreatment
- chamber
- actuator
- aftertreatment device
- 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.)
- Pending
Links
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 23
- 239000012528 membrane Substances 0.000 claims abstract description 19
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004202 carbamide Substances 0.000 claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 238000009792 diffusion process Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 description 31
- 239000000243 solution Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
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]
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/18—Ammonia
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
-
- 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
Abstract
The invention relates to an exhaust gas aftertreatment device (3) for an internal combustion engine of a motor vehicle, comprising a housing (6) having at least one duct (14) for guiding an aqueous urea solution and a chamber (15) in which a controllable actuator (11) that can act on the guiding of the aqueous urea solution is arranged, wherein the chamber (15) comprises at least one ammonia protection device (21) for protecting one or more components, in particular the actuator (11), from ammonia diffusion. According to the invention, the ammonia protection device (21) has at least one opening (18) which is closed by a gas-permeable membrane (20) in the housing (6) and is associated with the chamber (15).
Description
Technical Field
The invention relates to an exhaust gas aftertreatment device for an internal combustion engine of a motor vehicle, having a housing with at least one duct for guiding an aqueous urea solution and having a chamber in which a controllable actuator acting on the guiding of the aqueous urea solution is arranged, wherein the chamber has at least one ammonia protection device for protecting one or more components, in particular one or more components of the actuator, from the diffusion of ammonia.
Background
In today's exhaust gas aftertreatment systems, aqueous urea is typically used as a reactant for exhaust gas aftertreatment. The reagent is stored, for example, in a tank and is supplied by means of a delivery device to a metering valve which, as required, injects an aqueous urea solution into the exhaust gas tract of the internal combustion engine, so that it reacts downstream of the injection point with the exhaust gas in a manner reducing emissions, in particular in a catalytic converter provided for this purpose. Both the delivery device and the metering valve are each an exhaust gas aftertreatment agent treatment device of the exhaust gas aftertreatment system. Both of which lead the aqueous urea solution and have a chamber in which an actuator for operating, for example, a valve element or a pump piston is arranged. From the aqueous urea solution, ammonia can diffuse into the chamber and there have an erosive effect on components, in particular actuators, whereby these components corrode particularly rapidly, for example. In order to prevent this, it is known to provide ammonia protection in such chambers, for example in the form of a silver coating of the electrical connection contacts of the actuator. Shielding of the threatened component can also be achieved by more expensive means, such as complex encapsulation and/or seals. However, this results in high production costs, which are also determined by the fact that the individual components are each provided with their own ammonia protection.
Disclosure of Invention
The exhaust gas aftertreatment device having the features of claim 1 has the advantage that all components of the actuator, which are in particular in the chamber, are protected from ammonia by a simple and cost-effective solution. In this case, individual components, in particular of the actuator, do not have to be handled or protected separately, so that protection can be achieved simply and cost-effectively. According to the invention, this is achieved by: the ammonia protection device has at least one opening which is closed by a gas-permeable membrane in the housing and is assigned to the chamber. A pressure equalization between the interior of the housing, i.e. the chamber, and the surroundings is ensured by the opening. By means of the membrane, pressure equalization can only take place by gas exchange. The gas exchange allows gaseous ammonia to diffuse out of the chamber through the membrane and thus not reach concentrations in the chamber that are dangerous for the components located in the chamber. In this way, a reliable protection of all components of the exhaust gas aftertreatment device and in particular of the actuator located in the chamber from ammonia is ensured by the at least one opening and the membrane. The exhaust gas aftertreatment device is in particular a device which closes the flow cross section of the urea aqueous solution in the currentless or non-energized state. In this state, the pressure in the chamber will increase and the ammonia concentration will reach a critical value as the ammonia diffuses more and more from the urea aqueous solution. It is here that the presence of an advantageous ammonia protection has advantages.
Preferably, the opening is formed in a housing cover of the housing. In this way, the opening can be provided simply on the housing and can also be introduced afterwards, for example, without affecting the function of the exhaust gas aftertreatment device. In particular, by providing the opening in the housing cover, it is ensured that the membrane can be mounted on the cover before the cover is mounted, so that a simple attachment of the ammonia protection of the chamber can be achieved. It is therefore particularly preferred that the membrane is arranged on the housing cover in a preassembled manner.
It is furthermore preferably provided that the membrane is placed on the inner side of the housing cover facing the chamber. Thereby, a sealed connection between the membrane and the housing cover is ensured, which is supported by the pressure prevailing in the chamber.
It is furthermore preferably provided that the actuator is configured as an electromagnetic actuator. For this purpose, for example, at least one energizable coil and an armature which interacts magnetically with the coil and is displaceable are present in the chamber.
In particular, the actuator has an armature which is mounted displaceably in the chamber and which is connected to the pump piston and/or to the valve element for actuating the same. The exhaust gas aftertreatment device is thus configured, for example, as a delivery pump or as a metering valve.
The exhaust gas aftertreatment system according to the invention with the features of claim 7 is characterized in that at least one exhaust gas aftertreatment device is constructed according to the invention. The advantages already mentioned are thereby obtained. In addition to the use of exhaust gas aftertreatment systems and/or exhaust gas aftertreatment devices in internal combustion engines, applications in medical technology, in coffee machines, in thermal technology or in other devices/installations may also be considered, where exhaust gases containing hazardous reactants for the individual components are to be considered.
Drawings
The invention will be further elucidated with the aid of the drawing. To this end, in the sole figure,
fig. 1 shows an advantageous exhaust gas aftertreatment system in a simplified illustration.
Detailed Description
The sole figure shows an exhaust gas aftertreatment system 1 in a simplified representation, having a tank 2 for storing a liquid exhaust gas aftertreatment agent in the form of an aqueous urea solution and having an exhaust gas aftertreatment agent treatment device 3, which is fluidically connected to the tank 2 and is designed as a delivery pump 4. The delivery pump 4 is connected on the suction side to the tank 2 and on the pressure side to a controllable metering valve 5, which is shown here in a simplified manner.
The exhaust-gas aftertreatment device 3 has a housing 6 in which a diaphragm piston pump 7 is arranged. The diaphragm piston pump 7 has a movably mounted pump piston 8 which interacts with a flexible diaphragm 9 in order to suck the exhaust gas aftertreatment agent from the tank 2 by means of a reciprocating movement and to convey it in the direction of the metering valve 5. The piston diaphragm pump 7 is constructed in a known manner and method in this respect.
The pump piston 8 is fixedly connected to an likewise movably mounted armature 10 of an electromagnetic actuator 11. The actuator 11 also has an energizable coil 12 which magnetically interacts with the armature 10. If the coil 12 is energized, it attracts the armature 10 and thus the piston 8 against the force of the return spring 13. As the current supply is terminated, the return spring 13 presses the armature 10 and thus the pump piston 8 back into its initial position. Thereby effecting a reciprocating movement of the pump piston 8.
By means of the pump movement, the urea aqueous solution is conveyed through a channel 14 which extends through the housing 6 and interacts with the membrane 9. The actuator 11 is located in a chamber 15, which is separated from the channel 14, in particular by the membrane 9, and which is shown here in hatched lines, since in particular a housing element or a guide element is present in the chamber 15 and said chamber is generally free of liquid. The housing 6 has a housing base 16 in which the actuator 11 is arranged, as well as the pump piston 8 and the diaphragm 9. Furthermore, the housing 6 has a housing cover 17 which closes the chamber 15 and is connected in a sealed manner to the housing bottom shell 16. The housing cover 17 allows the individual components of the delivery device 4 to be simply fitted in the chamber 15. In particular, the cover 17 is connected to the housing base 16 in a material-locking manner, in particular welded, so that a sealing connection is permanently ensured.
An opening 18 is formed in the cover 17, which opening is arranged opposite the return spring 13 or the armature 10 on the end side according to the present exemplary embodiment. The opening 18 is closed by a gas-permeable membrane 20 on an inner side 19 of the housing cover 17 facing the chamber 15. The membrane 20 rests on the inner side 19 and thus covers the entire opening 18, so that gas can only escape from the chamber 15 through the membrane 20. The diaphragm 20 is constructed in particular in the form of a pressure-equalizing diaphragm.
If, during operation, ammonia now diffuses out of the aqueous urea solution located in the channel 14 and into the chamber 15, gaseous ammonia leaves the chamber 15 through the membrane 20 and the opening 18. This means that no critical concentration of ammonia is present in the chamber 15, which could lead to corrosion, in particular of components of the actuator 11. The opening 18 thus forms, together with the membrane 20, an ammonia protection 21 for the exhaust-gas aftertreatment-agent treatment device 3. This ensures a continuous and reliable operation of the exhaust gas aftertreatment device 3 and of the exhaust gas aftertreatment system 1 in a simple and cost-effective manner.
Claims (7)
1. An exhaust gas aftertreatment device (3) for an internal combustion engine of a motor vehicle, having a housing (6) with at least one duct (14) for conducting an aqueous urea solution and having a chamber (15) in which a controllable actuator (11) acting on the conducting of the urea solution is arranged, wherein the chamber (15) has at least one ammonia protection device (21) for protecting one or more components, in particular one or more components of the actuator (11), from the diffusion of ammonia, characterized in that the ammonia protection device (21) has at least one opening (18) which is closed in the housing (6) by a gas-permeable membrane (20) and is assigned to the chamber (15).
2. The exhaust gas aftertreatment device according to claim 1, characterized in that the opening (18) is configured in a housing cover (17) of the housing (6).
3. Exhaust gas aftertreatment device according to one of the preceding claims, characterized in that the membrane (20) is arranged on the housing cover (17) in a preassembled manner.
4. Exhaust gas aftertreatment device according to one of the preceding claims, characterized in that the membrane (20) bears against an inner side (19) of the housing cover (17) facing the chamber (15).
5. Exhaust gas aftertreatment device according to one of the preceding claims, characterized in that the actuator (11) is configured as an electromagnetic actuator (11).
6. Exhaust gas aftertreatment device according to one of the preceding claims, characterized in that the actuator (11) has a movably supported armature (10) which is connected to a pump piston (8) and/or to a valve element for the actuation thereof.
7. An exhaust gas aftertreatment system (1) for an internal combustion engine of a motor vehicle, having a tank (2) for supplying and storing an aqueous urea solution and having at least one exhaust gas aftertreatment device (3) fluidically connected to the tank (2), characterized in that the at least one exhaust gas aftertreatment device (3) is constructed according to one of claims 1 to 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018218752.5 | 2018-11-02 | ||
| DE102018218752.5A DE102018218752A1 (en) | 2018-11-02 | 2018-11-02 | Exhaust aftertreatment device, exhaust aftertreatment system |
| PCT/EP2019/077006 WO2020088884A1 (en) | 2018-11-02 | 2019-10-07 | Exhaust-gas aftertreatment device, exhaust-gas aftertreatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112996992A true CN112996992A (en) | 2021-06-18 |
Family
ID=68210773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980072411.2A Pending CN112996992A (en) | 2018-11-02 | 2019-10-07 | Exhaust gas aftertreatment device and exhaust gas aftertreatment system |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR20210081423A (en) |
| CN (1) | CN112996992A (en) |
| DE (1) | DE102018218752A1 (en) |
| WO (1) | WO2020088884A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007059237B3 (en) * | 2007-12-07 | 2009-02-05 | Thomas Magnete Gmbh | Piston-membrane pump for use as dosing pump in selective catalytic reduction exhaust gas cleaning system in diesel motor vehicle, has auxiliary membrane forming part of wall of drive area that is formed in pump housing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009001662A1 (en) * | 2009-03-19 | 2010-09-23 | Robert Bosch Gmbh | Valve i.e. dosing valve, for proportioned injection of urea water solution into exhaust gas of internal combustion engine, has valve body at which displacement force is applied, where force is proportional to medium pressure |
| DE102010039046A1 (en) * | 2010-08-09 | 2012-02-09 | Robert Bosch Gmbh | Injector |
| DE102013216578A1 (en) * | 2013-08-21 | 2015-02-26 | Robert Bosch Gmbh | Device for metering fluid |
| DE102014221627A1 (en) * | 2014-10-24 | 2016-04-28 | Robert Bosch Gmbh | Device and method for conveying and metering a fuel |
-
2018
- 2018-11-02 DE DE102018218752.5A patent/DE102018218752A1/en active Pending
-
2019
- 2019-10-07 WO PCT/EP2019/077006 patent/WO2020088884A1/en active Application Filing
- 2019-10-07 KR KR1020217016299A patent/KR20210081423A/en not_active Application Discontinuation
- 2019-10-07 CN CN201980072411.2A patent/CN112996992A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007059237B3 (en) * | 2007-12-07 | 2009-02-05 | Thomas Magnete Gmbh | Piston-membrane pump for use as dosing pump in selective catalytic reduction exhaust gas cleaning system in diesel motor vehicle, has auxiliary membrane forming part of wall of drive area that is formed in pump housing |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20210081423A (en) | 2021-07-01 |
| WO2020088884A1 (en) | 2020-05-07 |
| DE102018218752A1 (en) | 2020-05-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210618 |