EP3368756A1 - Device for post-treatment of waste gas - Google Patents

Device for post-treatment of waste gas

Info

Publication number
EP3368756A1
EP3368756A1 EP16788516.9A EP16788516A EP3368756A1 EP 3368756 A1 EP3368756 A1 EP 3368756A1 EP 16788516 A EP16788516 A EP 16788516A EP 3368756 A1 EP3368756 A1 EP 3368756A1
Authority
EP
European Patent Office
Prior art keywords
pressure sensor
injection device
pressure
additive
waste gas
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.)
Withdrawn
Application number
EP16788516.9A
Other languages
German (de)
French (fr)
Inventor
Jan Hodgson
Karsten PIETSCHMANN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP3368756A1 publication Critical patent/EP3368756A1/en
Withdrawn legal-status Critical Current

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
    • 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
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • 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
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/05—Systems for adding substances into exhaust
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • 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
    • 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
    • F01N2610/01—Adding substances to exhaust gases the substance being catalytic material in liquid form
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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
    • 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
    • F01N2900/1808—Pressure
    • 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

Definitions

  • the invention relates to a device for exhaust aftertreatment, comprising a conveying device for conveying a liquid additive from a container, a pressure sensor, an exhaust pipe, a leading from the conveyor to the exhaust gas supply line and an injection device for introducing the subsidized additive into the exhaust pipe.
  • the additive metered as accurately as possible injected into the exhaust pipe ⁇ .
  • the quantity to be injected depends on various parameters. In addition to the amount and the pressure with which the additive is injected, crucial because the pressure of the spray pattern of the injected into the exhaust line additive and thus its distribution and mixing over the cross section of the exhaust pipe is determined.
  • a pressure sensor is used. For this purpose, it is known to arrange this on the conveying device or to integrate it into a module containing the conveying device. The disadvantage here is that the conveyor device generates pressure pulses during operation, which are detected by the pressure sensor.
  • the invention is therefore an object of the invention to provide a Vorrich ⁇ device for exhaust aftertreatment, which detects as closely as possible the prevailing at the injector pressure, with disturbing influences should be reduced or eliminated as possible.
  • the object is achieved in that the pressure sensor is arranged on the injection device.
  • the pressure sensor With the arrangement of the pressure sensor on the injector, the pressure in the immediate vicinity of the point is measured, which is for optimal injection of the liquid additive is crucial.
  • Due to the immediate proximity to the injection device ⁇ a pressure sensor is hydraulically rigidly connected to the injection device. Disturbing pressure pulses of the conveyor are reduced by the thus created large spatial separation. This is made possible, in particular, by the delivery line and the fluid column standing in it, since due to the fluid properties damping occurs. This effect, which has hitherto adversely affected the Druckmes ⁇ solution, is now used advantageously due to the new arrangement of the pressure sensor. This makes it possible to determine the pressure pulses at the injector. Disturbing effects are almost impossible.
  • the structure of the conveyor module containing conveyor module also simplified. Likewise, the installation space is verklei ⁇ nert, thereby increasing the useful volume of a container for the liquid additive, when the conveyor module is disposed in the container.
  • the most important advantage is that as a result of the arrangement and the thereby enabled determination of the pressure pulses to the injection device, a diagnosis of the injection device is made possible, for example, to be able to monitor each injection process. Since these deviations detected by the pressure sensor are often only slight, it is only through the arrangement according to the invention that it is possible to use these deviations for diagnosis.
  • the pressure behavior of a faultless injection device is determined in advance. If, during operation of the exhaust gas aftertreatment device according to the invention, deviations in the pressure behavior which exceed tolerances to be defined appear, this may indicate impairments of the injection device. Such impairments can be deposits at the injection point, via which the additive is injected into the exhaust gas line.
  • the arrangement of the pressure sensor on the housing of the injector can be achieved with little effort according to an advantageous embodiment.
  • the housings of existing injectors can continue to be used because the changes are very small.
  • the housing of the injection device has an opening into which the pressure sensor is inserted.
  • the pressure sensor is flanged to the housing of the injection device, and via an opening in the housing there is a pressure connection to the pressure sensor.
  • the pressure sensor Protection of the pressure sensor against environmental influences is achieved according to another advantageous embodiment in that the pressure sensor is arranged within the housing of the injection device.
  • FIG. 1 shows an inventive device for exhaust gas aftertreatment
  • Fig. 2, 3 enlarged views of the injection device.
  • FIG. 1 shows schematically a device for exhaust gas aftertreatment in a motor vehicle.
  • a Container 1 for the liquid additive in this case an aqueous urea solution, arranged.
  • the urea solution is sucked into the container 1 and conveyed via a delivery line 3 to an injection device 4.
  • the injection device 4 is arranged on an exhaust pipe 5 of the motor vehicle.
  • the urea solution is injected into the exhaust pipe 5, where it mixes with the exhaust gas.
  • exhaust gas streams to provide from ⁇ -reaching extent of the exhaust pipe 5 provided in the urea solution with a specific pressure at the injector 4 has to be applied.
  • the pressure is usually 5 to 7 bar.
  • a pressure sensor 6 is arranged, which is hydraulically rigidly connected to the injection device 4 due to the immediate vicinity. Is injected via the injection device 4 urea solution, the pressure drop caused thereby is absorbed by the pressure sensor 6 immediacy ⁇ bar and to the full extent.
  • FIG. 2 shows the injection device 4 arranged on the exhaust gas line 5 in a larger illustration.
  • the pressure sensor 6 is flanged. Via an opening 8, the pressure in the injection device 4 is detected directly by the pressure sensor 6 and fed via a line 9 as an electrical signal to a non-presented Darge ⁇ control unit.
  • the pressure sensor 6 is inserted into the opening 8 of the housing of the injection device 4, so that it is directly and directly in contact with the additive and measures the pressure prevailing in the injection device 4.

Abstract

The invention relates to a device for the post treatment of waste gas, comprising a conveying device (2) for conveying a liquid additive from a container (1), a pressure sensor (6), a waste gas pipe (5), a conveying pipe (3) leading from the conveying device (2) to the waste gas pipe (5), and an injection device (4) for guiding the guided additive into the waste gas pipe (5). The pressure sensor (6) is arranged on the injection device (4).

Description

Beschreibung description
Vorrichtung zur Abgasnachbehandlung Device for exhaust aftertreatment
Gegenstand der Erfindung ist eine Vorrichtung zur Abgasnach- behandlung, umfassend eine Fördervorrichtung zum Fördern eines flüssigen Additivs aus einern Behälter, einen Drucksensor, eine Abgasleitung, eine von der Fördervorrichtung zu der Ab- gasleitung führende Förderleitung und eine Einspritzvorrich- tung zum Einleiten des geförderten Additivs in die Abgaslei- tung . The invention relates to a device for exhaust aftertreatment, comprising a conveying device for conveying a liquid additive from a container, a pressure sensor, an exhaust pipe, a leading from the conveyor to the exhaust gas supply line and an injection device for introducing the subsidized additive into the exhaust pipe.
Es ist bekannt, für eine optimale Abgasnachbehandlung, das Additiv möglichst genau dosiert in die Abgasleitung einzu¬ spritzen. Die einzuspritzende Menge hängt von verschiedenen Parametern ab. Neben der Menge ist auch der Druck, mit dem das Additiv eingespritzt wird, entscheidend, da über den Druck das Sprühbild des in die Abgasleitung eingespritzten Additivs und damit seine Verteilung und Vermischung über den Querschnitt das Abgasleitung bestimmt wird. Zur Überwachung des Drucks wird ein Drucksensor verwendet. Dazu ist bekannt, diesen an der Fördervorrichtung anzuordnen oder in ein die Fördervorrichtung enthaltenes Modul zu integrieren. Nachteilig hierbei ist, dass die Fördervorrichtung im Betrieb Druckpulse erzeugt, die vom Drucksensor erfasst werden. It is known for an optimal exhaust aftertreatment, the additive metered as accurately as possible injected into the exhaust pipe ¬ . The quantity to be injected depends on various parameters. In addition to the amount and the pressure with which the additive is injected, crucial because the pressure of the spray pattern of the injected into the exhaust line additive and thus its distribution and mixing over the cross section of the exhaust pipe is determined. To monitor the pressure, a pressure sensor is used. For this purpose, it is known to arrange this on the conveying device or to integrate it into a module containing the conveying device. The disadvantage here is that the conveyor device generates pressure pulses during operation, which are detected by the pressure sensor.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrich¬ tung zur Abgasnachbehandlung zu schaffen, die möglichst genau den an der Einspritzvorrichtung herrschenden Druck erfasst, wobei störende Einflüsse möglichst reduziert oder eliminiert werden soll. The invention is therefore an object of the invention to provide a Vorrich ¬ device for exhaust aftertreatment, which detects as closely as possible the prevailing at the injector pressure, with disturbing influences should be reduced or eliminated as possible.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass der Drucksensor an der Einspritzvorrichtung angeordnet ist. Mit der Anordnung des Drucksensors an der Einspritzvorrichtung wird der Druck in unmittelbarer Nähe des Punktes gemessen, der für eine optimale Einspritzung des flüssigen Additivs entscheidend ist. Aufgrund der unmittelbaren Nähe zur Ein¬ spritzvorrichtung ist der Drucksensor hydraulisch starr mit der Einspritzvorrichtung verbunden. Störende Druckpulse der Fördervorrichtung werden durch die so geschaffene große räumliche Trennung vermindert. Dies wird insbesondere durch die Förderleitung und die in ihr stehende Fluidsäule ermöglicht, da aufgrund der Fluideigenschaften eine Dämpfung entsteht. Dieser Effekt, der sich bislang nachteilig auf die Druckmes¬ sung auswirkte, wird aufgrund der neuen Anordnung des Drucksensors nunmehr in vorteilhafter Weise genutzt. Damit wird ermöglicht, die Druckpulse am Injektor zu bestimmen. Störende Effekte sind nahezu ausgeschlossen. Das erlaubt eine schnelle Korrektur der eindosierten Menge des Additivs. Schließlich vereinfacht sich auch der Aufbau des die Fördervorrichtung beinhaltenden Fördermoduls. Ebenso wird der Bauraum verklei¬ nert, wodurch das nutzbare Volumen eines Behälters für das flüssige Additiv erhöht, wenn das Fördermodul in dem Behälter angeordnet ist. According to the invention the object is achieved in that the pressure sensor is arranged on the injection device. With the arrangement of the pressure sensor on the injector, the pressure in the immediate vicinity of the point is measured, which is for optimal injection of the liquid additive is crucial. Due to the immediate proximity to the injection device ¬ a pressure sensor is hydraulically rigidly connected to the injection device. Disturbing pressure pulses of the conveyor are reduced by the thus created large spatial separation. This is made possible, in particular, by the delivery line and the fluid column standing in it, since due to the fluid properties damping occurs. This effect, which has hitherto adversely affected the Druckmes ¬ solution, is now used advantageously due to the new arrangement of the pressure sensor. This makes it possible to determine the pressure pulses at the injector. Disturbing effects are almost impossible. This allows a quick correction of the metered amount of the additive. Finally, the structure of the conveyor module containing conveyor module also simplified. Likewise, the installation space is verklei ¬ nert, thereby increasing the useful volume of a container for the liquid additive, when the conveyor module is disposed in the container.
Der wesentlichste Vorteil besteht jedoch darin, dass infolge der Anordnung und der dadurch ermöglichten Bestimmung der Druckpulse an der Einspritzvorrichtung auch eine Diagnose der Einspritzvorrichtung ermöglicht wird, um beispielsweise jeden Einspritzvorgang überwachen zu können. Da diese vom Drucksensor detektierten Abweichungen oftmals nur gering sind, wird erst durch die erfindungsgemäße Anordnung ermöglicht, diese Abweichungen zur Diagnose zu nutzen. Dazu wird das Druckverhalten einer fehlerfreien Einspritzvorrichtung im Vorfeld ermittelt. Sofern im Betrieb der erfindungsgemäßen Vorrichtung zur Abgasnachbehandlung über zu definierende Toleranzen hinausgehende Abweichungen im Druckverhalten auftauchen, kann dies auf Beeinträchtigungen der Einspritzvorrichtung hindeuten. Derartige Beeinträchtigungen können Ablagerungen an der Einspritzstelle sein, über die das Additiv in die Abgaslei- tung eingespritzt wird. Dies ermöglicht Rückschlüsse auf das Sprühbild mit dem das Additiv in den Abgasstrom eingespritzt wird. Ebenso lassen sich Rückschlüsse auf die tatsächlich eingespritzte Menge ziehen. Sowohl Additivmenge als auch Sprühbild sind entscheidend für die anschließende Abgasnach¬ behandlung, da mit dem Sprühbild die Verteilung des Additivs im Abgas bestimmt wird und die Menge den Grad der Abgasnach- behandlung bestimmt. The most important advantage, however, is that as a result of the arrangement and the thereby enabled determination of the pressure pulses to the injection device, a diagnosis of the injection device is made possible, for example, to be able to monitor each injection process. Since these deviations detected by the pressure sensor are often only slight, it is only through the arrangement according to the invention that it is possible to use these deviations for diagnosis. For this purpose, the pressure behavior of a faultless injection device is determined in advance. If, during operation of the exhaust gas aftertreatment device according to the invention, deviations in the pressure behavior which exceed tolerances to be defined appear, this may indicate impairments of the injection device. Such impairments can be deposits at the injection point, via which the additive is injected into the exhaust gas line. This allows conclusions to the spray pattern with which the additive is injected into the exhaust stream. Likewise, conclusions can be drawn on the actual pull in injected quantity. Both additive quantity and spray pattern are crucial to the subsequent exhaust gas after-treatment ¬ because the distribution of the additive is determined in the exhaust gas with the spray pattern and the amount determines the amount of exhaust gas treatment.
Die Anordnung des Drucksensors am Gehäuse der Einspritzvorrichtung lässt gemäß einer vorteilhaften Ausgestaltung mit geringem Aufwand erreichen. Insbesondere die Gehäuse beste- hender Einspritzvorrichtungen lassen sich dadurch weiter nutzen, da die Veränderungen sehr gering sind. The arrangement of the pressure sensor on the housing of the injector can be achieved with little effort according to an advantageous embodiment. In particular, the housings of existing injectors can continue to be used because the changes are very small.
In einer besonders einfachen Ausgestaltung besitzt das Gehäuse der Einspritzvorrichtung eine Öffnung, in die der Druck- sensor eingesetzt ist. In a particularly simple embodiment, the housing of the injection device has an opening into which the pressure sensor is inserted.
In einer anderen Ausgestaltung ist der Drucksensor an dem Gehäuse der Einspritzvorrichtung angeflanscht, und über eine Öffnung im Gehäuse besteht eine Druckverbindung zum Drucksen- sor. In another embodiment, the pressure sensor is flanged to the housing of the injection device, and via an opening in the housing there is a pressure connection to the pressure sensor.
Ein Schutz des Drucksensors vor Umwelteinflüssen wird nach einer anderen vorteilhaften Ausgestaltung dadurch erreicht, dass der Drucksensor innerhalb des Gehäuses der Einspritzvor- richtung angeordnet ist. Protection of the pressure sensor against environmental influences is achieved according to another advantageous embodiment in that the pressure sensor is arranged within the housing of the injection device.
An mehreren Ausführungsbeispielen wird die Erfindung näher erläutert . Es zeigen in Fig. 1 eine erfindungsgemäße Vorrichtung zur Abgasnachbehandlung, In several embodiments, the invention will be explained in more detail. 1 shows an inventive device for exhaust gas aftertreatment,
Fig. 2, 3 vergrößerte Darstellungen der Einspritzvorrichtung . Fig. 2, 3 enlarged views of the injection device.
Figur 1 zeigt schematisch eine Vorrichtung zur Abgasnachbehandlung in einem Kraftfahrzeug. In dem Kraftfahrzeug ist ein Behälter 1 für das flüssige Additiv, in diesem Fall eine wässrige Harnstofflösung, angeordnet. Mittels einer Fördervorrichtung 2 wird die Harnstofflösung dem Behälter 1 angesaugt und über eine Förderleitung 3 zu einer Einsprit zvor- richtung 4 gefördert. Die Einspritzvorrichtung 4 ist an einer Abgasleitung 5 des Kraftfahrzeugs angeordnet. Mittels der Einspritzvorrichtung 4 wird die Harnstofflösung in die Abgasleitung 5 eingespritzt, wo sie sich mit dem Abgas vermischt. Um die Harnstofflösung in Abhängigkeit von den während des Betriebs des Kraftfahrzeugs anfallenden Abgasströmen im aus¬ reichendem Maße der Abgasleitung 5 zur Verfügung zu stellen, muss die Harnstofflösung mit einem bestimmten Druck an der Einspritzvorrichtung 4 anliegen. Der Druck beträgt üblicherweise 5 bis 7 bar. An der Einspritzvorrichtung 4 ist ein Drucksensor 6 angeordnet, der aufgrund der unmittelbaren Nähe hydraulisch starr mit der Einspritzvorrichtung 4 verbunden ist. Wird über die Einspritzvorrichtung 4 Harnstofflösung eingespritzt, wird der dadurch bedingte Druckabfall unmittel¬ bar und im vollen Umfang vom Drucksensor 6 aufgenommen. FIG. 1 shows schematically a device for exhaust gas aftertreatment in a motor vehicle. In the motor vehicle is a Container 1 for the liquid additive, in this case an aqueous urea solution, arranged. By means of a conveying device 2, the urea solution is sucked into the container 1 and conveyed via a delivery line 3 to an injection device 4. The injection device 4 is arranged on an exhaust pipe 5 of the motor vehicle. By means of the injection device 4, the urea solution is injected into the exhaust pipe 5, where it mixes with the exhaust gas. To the urea solution, depending on the occurring during operation of the motor vehicle exhaust gas streams to provide from ¬-reaching extent of the exhaust pipe 5 provided in the urea solution with a specific pressure at the injector 4 has to be applied. The pressure is usually 5 to 7 bar. At the injection device 4, a pressure sensor 6 is arranged, which is hydraulically rigidly connected to the injection device 4 due to the immediate vicinity. Is injected via the injection device 4 urea solution, the pressure drop caused thereby is absorbed by the pressure sensor 6 immediacy ¬ bar and to the full extent.
Die Figur 2 zeigt die an der Abgasleitung 5 angeordnete Einspritzvorrichtung 4 in einer größeren Darstellung. An dem Gehäuse 7 der Einspritzvorrichtung 4 ist der Drucksensor 6 angeflanscht. Über eine Öffnung 8 wird der Druck in der Ein- spritzvorrichtung 4 direkt vom Drucksensor 6 erfasst und über eine Leitung 9 als elektrisches Signal einer nicht darge¬ stellten Steuereinheit zugeführt. FIG. 2 shows the injection device 4 arranged on the exhaust gas line 5 in a larger illustration. On the housing 7 of the injection device 4, the pressure sensor 6 is flanged. Via an opening 8, the pressure in the injection device 4 is detected directly by the pressure sensor 6 and fed via a line 9 as an electrical signal to a non-presented Darge ¬ control unit.
In Figur 3 ist der Drucksensor 6 in die Öffnung 8 des Gehäu- ses der Einspritzvorrichtung 4 eingesetzt, so dass er direkt und unmittelbar mit dem Additiv in Kontakt ist und den in der Einspritzvorrichtung 4 herrschenden Druck misst. In FIG. 3, the pressure sensor 6 is inserted into the opening 8 of the housing of the injection device 4, so that it is directly and directly in contact with the additive and measures the pressure prevailing in the injection device 4.

Claims

Patentansprüche claims
1. Vorrichtung zur Abgasnachbehandlung, umfassend eine Fördervorrichtung zum Fördern eines flüssigen Additivs aus einem Behälter, einen Drucksensor, eine Abgasleitung, eine von der Fördervorrichtung zu der Abgasleitung führende Förderleitung und eine Einspritzvorrichtung zum Einleiten des geförderten Additivs in die Abgasleitung, dadurch gekennzeichnet, dass der Drucksensor (6) an der Einspritzvorrichtung (4) angeordnet ist. A device for exhaust aftertreatment, comprising a conveying device for conveying a liquid additive from a container, a pressure sensor, an exhaust pipe, a leading from the conveyor to the exhaust pipe conveying line and an injection device for introducing the subsidized additive into the exhaust pipe, characterized in that the Pressure sensor (6) on the injection device (4) is arranged.
2. Vorrichtung nach Anspruch 1, da du r c h g e k e n n z e i c h n e t , dass der Drucksensor (6) am Ge¬ häuse (7) der Einspritzvorrichtung (4) befestigt ist. 2. Apparatus according to claim 1, since you rchgekennzeichnet that the pressure sensor (6) on Ge ¬ housing (7) of the injection device (4) is fixed.
3. Vorrichtung nach Anspruch 2, da du r c h g e k e n n z e i c h n e t , dass das Gehäuse (7) der Ein¬ spritzvorrichtung (4) eine Öffnung (8) besitzt, in die der Drucksensor (6) eingesetzt ist. 3. Apparatus according to claim 2, since you rchgekennzeichnet that the housing (7) of the A ¬ injection device (4) has an opening (8) into which the pressure sensor (6) is inserted.
4. Vorrichtung nach Anspruch 2, da du r c h g e k e n n z e i c h n e t , dass der Drucksensor (6) an dem Gehäuse (7) der Einspritzvorrichtung (7) angeflanscht ist, und über eine Öffnung (8) im Gehäuse (7) eine Druckverbindung zum Drucksensor (6) besteht. 4. Apparatus according to claim 2, since you rchgekennzeichnet that the pressure sensor (6) on the housing (7) of the injection device (7) is flanged, and via an opening (8) in the housing (7) has a pressure connection to the pressure sensor (6). consists.
5. Vorrichtung nach Anspruch 1, da du r c h g e k e n n z e i c h n e t , dass der Drucksensor (6) inner¬ halb des Gehäuses (7) der Einspritzvorrichtung (4) angeordnet ist . 5. Apparatus according to claim 1, since you rchgekennzeichnet that the pressure sensor (6) within ¬ half of the housing (7) of the injection device (4) is arranged.
EP16788516.9A 2015-10-30 2016-10-28 Device for post-treatment of waste gas Withdrawn EP3368756A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015221363 2015-10-30
PCT/EP2016/076110 WO2017072311A1 (en) 2015-10-30 2016-10-28 Device for post-treatment of waste gas

Publications (1)

Publication Number Publication Date
EP3368756A1 true EP3368756A1 (en) 2018-09-05

Family

ID=58546265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16788516.9A Withdrawn EP3368756A1 (en) 2015-10-30 2016-10-28 Device for post-treatment of waste gas

Country Status (6)

Country Link
US (1) US20180245500A1 (en)
EP (1) EP3368756A1 (en)
CN (1) CN108138635A (en)
BR (1) BR112018006476A2 (en)
DE (1) DE102016221299A1 (en)
WO (1) WO2017072311A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2724419B2 (en) * 1990-08-28 1998-03-09 日本特殊陶業株式会社 Pressure sensor
EP1672191B1 (en) * 2003-10-02 2011-08-17 Nissan Diesel Motor Co., Ltd. Exhaust gas cleaner for engine
US20060101810A1 (en) * 2004-11-15 2006-05-18 Angelo Theodore G System for dispensing fuel into an exhaust system of a diesel engine
DE102010004614A1 (en) * 2010-01-13 2011-07-14 Emitec Gesellschaft für Emissionstechnologie mbH, 53797 Tank arrangement and metering system for a reducing agent
DE102010034709A1 (en) * 2010-08-18 2012-02-23 Emitec Gesellschaft Für Emissionstechnologie Mbh Dosing unit for a reducing agent
KR101490931B1 (en) * 2013-08-13 2015-02-06 현대자동차 주식회사 Urea solution pumping module

Also Published As

Publication number Publication date
CN108138635A (en) 2018-06-08
BR112018006476A2 (en) 2018-10-09
US20180245500A1 (en) 2018-08-30
WO2017072311A1 (en) 2017-05-04
DE102016221299A1 (en) 2017-05-04

Similar Documents

Publication Publication Date Title
EP2813679B1 (en) Exhaust gas unit for a combustion engine
DE102009029408B4 (en) Method for monitoring the function of an SCR catalyst system
DE102009023325B4 (en) Method for adapting the injection of injection agent in an injection system
DE102011051875A1 (en) DOSING MODULE FOR A VEHICLE EXHAUST TREATMENT SYSTEM
DE102011013335A1 (en) Exhaust system of an internal combustion engine
EP3301271B1 (en) Method for purging an exhaust gas aftertreatment device
DE112015005254B4 (en) NITROGEN OXIDE SIGNAL MULTIPLEX SYSTEM
DE102007044610A1 (en) Method for detecting the minimum opening time of a reducing agent supply device in an exhaust aftertreatment system with an SCR catalyst
DE112014005929T5 (en) Integrated sensor water shield
WO2015158454A1 (en) Fuel delivery device for a saddle tank
DE102005009464A1 (en) Method for operating an internal combustion engine and device for carrying out the method
DE102011003499A1 (en) Method for monitoring dosing system, particularly for selective catalytic reduction catalytic converter, involves comparing control value of feed pump with predetermined reference values
DE102007020965A1 (en) Device for the metered injection of an exhaust gas aftertreatment agent-air mixture in an exhaust system
EP3368756A1 (en) Device for post-treatment of waste gas
DE102017205298A1 (en) Method for determining quantity deviations in a fluidic dosing system
EP2825738B1 (en) Injection device
DE102009017126B4 (en) Water treatment process and device therefor
DE102018206078A1 (en) Dosing system and method for dosing a predetermined amount of liquid
EP2825740B1 (en) Dosing device
DE102011077956A1 (en) Device for injecting fluid into exhaust line of internal combustion engine, has two electrical measurement points that are provided on fluid line for measuring electrical conductivity of fluid in fluid line
DE102014213358A1 (en) Diagnostic procedure for an SCR system in a vehicle
EP3861417B1 (en) Liquid ejection device for a vehicle wash facility, and method for operating same
DE102010043442A1 (en) Method for metering reducing agent in exhaust pipe of internal combustion engine, involves supplying compressed air for aerosol formation at different times for metering reducing agent by metering valve
DE102015201859A1 (en) Method and device for calibrating a printing model
AT508128B1 (en) METHOD FOR INJECTING WATER IN A SIGNIFICANTLY CONTAINED SPACE

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20180530

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20181219