EP3530898A1 - Exhaust system - Google Patents

Exhaust system Download PDF

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Publication number
EP3530898A1
EP3530898A1 EP19155476.5A EP19155476A EP3530898A1 EP 3530898 A1 EP3530898 A1 EP 3530898A1 EP 19155476 A EP19155476 A EP 19155476A EP 3530898 A1 EP3530898 A1 EP 3530898A1
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EP
European Patent Office
Prior art keywords
sensor
exhaust system
sensor carrier
carrier element
exhaust
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.)
Granted
Application number
EP19155476.5A
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German (de)
French (fr)
Other versions
EP3530898B1 (en
Inventor
Benjamin Röhr
Roland Schwarz
Wolfgang Herbst
Frank Berkemer
Tadeusz-Jozef Juroszek
Peter Gorke
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.)
Eberspaecher Exhaust Technology GmbH and Co KG
Original Assignee
Eberspaecher Exhaust Technology GmbH and Co KG
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Publication of EP3530898A1 publication Critical patent/EP3530898A1/en
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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
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles

Definitions

  • the present invention relates to an exhaust system for an example used in a motor vehicle internal combustion engine.
  • sensors such as a temperature sensor sensing the exhaust gas temperature, or one or more exhaust gas composition sensing sensors, such as a nitrogen oxide sensor.
  • sensors are generally provided on, for example, tubular exhaust gas-carrying elements near exhaust aftertreatment systems, such as an SCR catalyst arrangement.
  • an exhaust system in particular for an internal combustion engine in a vehicle, comprising at least one sensor carrier unit carried on an exhaust-gas-conducting element, wherein the sensor carrier unit has a sensor carrier element fixed to the exhaust-gas-conducting element and a plurality, for example three or at least three, on the sensor carrier element , Includes sensor-equipped or equipped with sensors or with each at least one sensor receptacle / measuring opening formed therein.
  • the use of a single sensor carrier unit creates the possibility of providing a plurality of sensors on the exhaust system or on an exhaust-carrying element thereof. This makes it possible to associate with each individual sensor to be provided Assign assigned sensor nozzle with high precision and set on the sensor carrier unit on the exhaust gas element. Since in determining the sensor carrier unit on the exhaust gas-carrying element on the sensor nozzle itself is not acted upon, there is no risk in any of the several to be provided sensor nozzle that this is damaged when connected to the exhaust gas-carrying element or in particular in relation to other sensor nozzle inappropriate positioning is determined.
  • the sensor carrier element has a sensor carrier element contour matched to an outer peripheral contour of the exhaust-gas-conducting element.
  • the sensor carrier element is formed in one piece with at least one, preferably each sensor socket.
  • the sensor carrier unit may be formed as a cast component.
  • the sensor support element in association with at least one, preferably each sensor nozzle on a Stutzenstromplateau for conditioning at least one of the sensor support member separately formed sensor nozzle.
  • each of the sensor support member separately formed sensor neck comprises a positioning in a positioning of the sensor support member engaging positioning positioning approach.
  • the positioning approach can surround the sensor receptacle / measuring opening formed in the sensor neck like a ring.
  • each of the sensor support member separately formed sensor nozzle is provided a ganst for conditioning of the sensor nozzle at the associated Sensorstromplateau.
  • the abutment bead preferably surrounds the positioning shoulder formed on the sensor neck like a ring.
  • a connection of a respective sensor connection piece to the sensor support element which is stable in the case of thermal or mechanical loads, can be achieved by connecting at least one, preferably each sensor connection piece formed separately from the sensor support element to the sensor support element by welding, preferably capacitor discharge welding.
  • the sensor support member may be connected to the exhaust gas-carrying element by welding, preferably laser welding, MAG welding or capacitor discharge welding.
  • the sensor carrier element can be formed as a sheet-metal forming part.
  • the invention further relates to a sensor carrier unit, in particular for an exhaust system constructed according to the invention, comprising a sensor carrier element to be fixed to an exhaust gas-carrying element and to the sensor carrier element a plurality of sensor sockets which can be equipped with sensors each having at least one sensor receiver / measuring aperture formed therein.
  • a sensor carrier unit can with the previously explained, and for these specific features may be formed individually or in any combination.
  • an exhaust system for an internal combustion engine of a motor vehicle is generally designated 10.
  • the exhaust system 10 comprises in an upstream region an exhaust gas aftertreatment unit 12, for example an SCR catalyst unit, into which the exhaust gas A emitted by an internal combustion engine is introduced.
  • a tube-like exhaust gas-carrying element 14 leads the exhaust gas discharged from the exhaust gas after-treatment unit 12 to a muffler unit 16 arranged, for example, in a downstream end region of the exhaust system 10.
  • the exhaust gas is discharged to the surroundings via tailpipes 18.
  • the sensor carrier unit 20 comprises a sensor carrier element 22 designed, for example, as a sheet-metal forming part.
  • the contour or shaping of the sensor carrier element 22 is adapted to the contour of the exhaust-gas-carrying element 14 in the region accommodating the sensor carrier unit 20.
  • the elongated sensor carrier element 22 has a curved shape adapted to the, for example, circularly curved outer contour of the exhaust gas-carrying element 14.
  • each sensor nozzle 24, 26, 28 provides a sensor receptacle / measuring opening 30 into which a sensor can be inserted and through which the sensor can interact with the exhaust gas flowing in the exhaust gas-carrying element 14 in measuring interaction.
  • this can be formed at least in regions with an internal thread 31 into which a corresponding external thread of the sensor to be received therein can be screwed.
  • a respective sensor receptacle / measuring opening 30 can have an annular bottom area 32, on which the sensor accommodated therein can be supported by way of an example O-ring-like sealing element or the like.
  • the sensor receiving sockets 24, 26, 28 can be designed, for example, as metal components produced by machining.
  • a sump installation plateau 34 is provided on the sensor support element 22.
  • each nozzle attachment platform 34 which provides a substantially non-curved, flat abutment region for a respective associated sensor nozzle 24, 26, 28, a positioning opening 36 for receiving a at the respective sensor nozzle 24, 26, 28 provided, the Sensor receptacle / measuring opening ring-like or substantially cylindrical surrounding Positionieransatzes 38 provided.
  • the inner dimensions of the positioning opening 36 and the outer dimensions of the positioning projection 38 can be matched to one another in such a way that a virtually backlash-free and thus a defined positioning for a respective sensor socket 24, 26, 28 predetermined engagement interaction is achieved.
  • the sensor sockets 24, 26, 28 abut on the respective nozzle attachment plateaus 34 of the sensor carrier element 22 which are respectively assigned thereto via an abutment bead 40 which surrounds the positioning attachment 38 or the sensor receptacle / measuring opening 30 in an annular manner.
  • a line-like system interaction between a respective sensor nozzle 24, 26, 28 and a respective nozzle attachment platform 34 is achieved over the entire circumference around the sensor receptacle / measuring aperture.
  • This is particularly advantageous when the sensor sockets 24, 26, 28 are connected to the sensor support element by capacitor discharge welding.
  • Such a welding method is particularly advantageous because it ensures a very stable connection of the sensor sockets 24, 26, 28 with the sensor support element 22 even under the thermal and mechanical loads expected during operation of an internal combustion engine.
  • the structure of the sensor carrier unit 20 using such a welding method is easy to carry out, since the components to be welded together, namely the sensor nozzle 24, 26, 28 on the one hand and the sensor carrier element 22 on the other hand, using appropriate tools can be easily pressed against each other to those for the Performing a capacitor discharge welding process required to ensure contact pressure. Furthermore, the use of such a capacitor discharge welding process leads to virtually no welding distortion on the components to be joined together, so that this with the resulting from the respective manufacturing process and for the connection to the exhaust gas carrying element 14 on the one hand or the recording of sensors on the other hand provided with high precision shaping be available even after performing the capacitor discharge welding process.
  • the sensor carrier unit 20 having a plurality of sensor sockets 24, 26, 28 can be introduced in their entirety into the manufacturing process of an exhaust system, so that in this manufacturing process only a single connection operation has to be performed to connect a plurality of sensor sockets 24, 26, 28 to the exhaust gas-carrying component 14 the exhaust system 10 set.
  • a material connection is produced by welding.
  • a laser welding process or a MAG welding process that is to say an inert gas welding process, is preferably carried out. In such welding methods, a comparatively high contact pressure between the components to be welded, as required in a capacitor discharge welding process, is not necessary.
  • the tube-like exhaust guide component 14 which is additionally weakened in the region in which the sensor support unit 20 is determined by the introduction of an opening to be covered by the sensor support unit 20 opening, can not occur.
  • access for corresponding support tools is present in the region of the exhaust-gas-conducting component 14 or if it is correspondingly stable due to its structural design, it is of course also possible to connect the sensor support unit 20 to the exhaust-gas-carrying component 14 using a capacitor discharge welding process.
  • sensor nozzles of various types can be provided in order to provide correspondingly differently designed sensors on an exhaust system can.
  • similarly designed sensor sockets may be provided on the sensor carrier unit and / or that, for example, more than three sensor sockets or even only two sensor sockets may be provided on a sensor carrier unit.
  • the possibility could also be created in a single sensor socket to fix several sensors to it. For this purpose, it would be possible to provide a corresponding number of sensor receptacles / measuring openings assigned to the sensors to be defined in a single sensor socket.
  • the sensor carrier unit could be provided as a one-piece construction in which at least one of the sensor stubs is provided integrally with the sensor carrier element, ie as a material block, and is not fixed thereto as a separate component.
  • the sensor carrier unit can be provided with the sensor carrier element and at least one of the sensor stubs as a cast component or possibly also as a sheet metal forming component, to which the sensor stubs provided with an internal thread can be provided by reshaping and optionally subsequent machining.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)

Abstract

Eine Abgasanlage, insbesondere für eine Brennkraftmaschine in einem Fahrzeug, umfasst wenigstens eine an einem abgasführenden Element (14) getragene Sensorträgereinheit (20), wobei die Sensorträgereinheit (20) ein an dem abgasführenden Element (14) festgelegtes Sensorträgerelement (22) und an dem Sensorträgerelement (22) eine Mehrzahl von mit Sensoren bestückten oder bestückbaren Sensorstutzen (24, 26, 28) jeweils mit wenigstens einer darin ausgebildeten Sensoraufnahme/Mess-Öffnung (30) umfasst.An exhaust system, in particular for an internal combustion engine in a vehicle, comprises at least one sensor carrier unit (20) carried on an exhaust-carrying element (14), wherein the sensor carrier unit (20) has a sensor carrier element (22) fixed to the exhaust-gas-carrying element (14) and to the sensor carrier element (22) comprises a plurality of equipped with sensors or can be equipped sensor nozzle (24, 26, 28) each having at least one sensor receiving / measuring opening formed therein (30).

Description

Die vorliegende Erfindung betrifft eine Abgasanlage für eine beispielsweise in einem Kraftfahrzeug eingesetzte Brennkraftmaschine.The present invention relates to an exhaust system for an example used in a motor vehicle internal combustion engine.

In modernen Abgasanlagen sind zum Bereitstellen von Information, welche zur Reduzierung des Schadstoffausstoßes erforderlich ist, verschiedene Sensoren, wie zum Beispiel ein die Abgastemperatur erfassender Temperatursensor oder ein bzw. mehrere die Abgaszusammensetzung erfassende Sensoren, wie zum Beispiel Stickoxydsensor, vorgesehen. Derartige Sensoren sind im Allgemeinen an beispielsweise rohrartigen, abgasführenden Elementen nahe von Abgasnachbehandlungssystemen, wie zum Beispiel einer SCR-Katalysatoranordnung, vorgesehen.In modern exhaust systems, to provide information necessary to reduce pollutant emissions, various sensors are provided, such as a temperature sensor sensing the exhaust gas temperature, or one or more exhaust gas composition sensing sensors, such as a nitrogen oxide sensor. Such sensors are generally provided on, for example, tubular exhaust gas-carrying elements near exhaust aftertreatment systems, such as an SCR catalyst arrangement.

Es ist die Aufgabe der vorliegenden Erfindung, eine Abgasanlage vorzusehen, mit welcher in baulich einfacher Weise die Möglichkeit geschaffen ist, die für einen Betrieb der Abgasanlage bzw. einer zugeordneten Brennkraftmaschine erforderliche Information bereitzustellen.It is the object of the present invention to provide an exhaust system with which in a structurally simple way the possibility is provided to provide the information required for operation of the exhaust system or an associated internal combustion engine.

Erfindungsgemäß wird diese Aufgabe gelöst durch eine Abgasanlage, insbesondere für eine Brennkraftmaschine in einem Fahrzeug, umfassend wenigstens eine an einem abgasführenden Element getragene Sensorträgereinheit, wobei die Sensorträgereinheit ein an dem abgasführenden Element festgelegtes Sensorträgerelement und an dem Sensorträgerelement eine Mehrzahl, zum Beispiel drei oder wenigstens drei, von mit Sensoren bestückten oder bestückbaren Sensorstutzen jeweils mit wenigstens einer darin ausgebildeten Sensoraufnahme/Meß-Öffnung umfasst.According to the invention, this object is achieved by an exhaust system, in particular for an internal combustion engine in a vehicle, comprising at least one sensor carrier unit carried on an exhaust-gas-conducting element, wherein the sensor carrier unit has a sensor carrier element fixed to the exhaust-gas-conducting element and a plurality, for example three or at least three, on the sensor carrier element , Includes sensor-equipped or equipped with sensors or with each at least one sensor receptacle / measuring opening formed therein.

Bei einer erfindungsgemäß aufgebauten Abgasanlage wird durch den Einsatz einer einzigen Sensorträgereinheit die Möglichkeit geschaffen, mehrere Sensoren an der Abgasanlage bzw. einem abgasführenden Element derselben vorzusehen. Dies ermöglicht es, in Zuordnung zu jedem einzelnen vorzusehenden Sensor den zugeordneten Sensorstutzen mit hoher Präzision auszugestalten und über die Sensorträgereinheit am abgasführenden Element festzulegen. Da bei dem Festlegen der Sensorträgereinheit an dem abgasführenden Element auf die Sensorstutzen selbst nicht eingewirkt wird, besteht bei keinem der mehreren bereitzustellenden Sensorstutzen die Gefahr, dass dieser beim Anbinden an das abgasführende Element beschädigt oder insbesondere im Verhältnis zu anderen Sensorstutzen in ungeeigneter Positionierung festgelegt wird. Da nicht jeder Sensorstutzen einzeln an einem abgasführenden Element festgelegt werden muss, wird die Handhabung der miteinander zu verbindenden Bauteile bei der Herstellung einer Abgasanlage vereinfacht. Auch die für den Aufbau einer Abgasanlage erforderliche Zeitdauer kann verringert werden, da die eine Mehrzahl von Sensorstutzen aufweisende Sensorträgereinheit als vorgefertigte Baugruppe in den Herstellungsprozess eingeführt und in einem einzigen Arbeitsgang mit dem abgasführenden Element verbunden werden kann.In an exhaust system constructed according to the invention, the use of a single sensor carrier unit creates the possibility of providing a plurality of sensors on the exhaust system or on an exhaust-carrying element thereof. This makes it possible to associate with each individual sensor to be provided Assign assigned sensor nozzle with high precision and set on the sensor carrier unit on the exhaust gas element. Since in determining the sensor carrier unit on the exhaust gas-carrying element on the sensor nozzle itself is not acted upon, there is no risk in any of the several to be provided sensor nozzle that this is damaged when connected to the exhaust gas-carrying element or in particular in relation to other sensor nozzle inappropriate positioning is determined. Since not every sensor nozzle must be individually fixed to an exhaust gas-carrying element, the handling of the components to be joined together in the manufacture of an exhaust system is simplified. Also, the time required for the construction of an exhaust system can be reduced, since the plurality of sensor nozzle having sensor carrier unit can be introduced as a prefabricated module in the manufacturing process and connected in a single operation with the exhaust gas-conducting element.

Um in zuverlässiger Weise einen gegen den Austritt von Abgas dichten Verbund zwischen dem abgasführenden Element und der Sensorträgereinheit vorzusehen, wird vorgeschlagen, dass das Sensorträgerelement eine an eine Außenumfangskontur des abgasführenden Elements angepasste Sensorträgerelementenkontur aufweist.In order reliably to provide a seal against the escape of exhaust gas between the exhaust gas-carrying element and the sensor carrier unit, it is proposed that the sensor carrier element has a sensor carrier element contour matched to an outer peripheral contour of the exhaust-gas-conducting element.

Eine einfach zu realisierende Ausgestaltung kann vorsehen, dass das Sensorträgerelement mit wenigstens einem, vorzugsweise jedem Sensorstutzen einstückig ausgebildet ist. Dabei kann beispielsweise die Sensorträgereinheit als Gussbauteil ausgebildet sein.An embodiment that is easy to implement can provide that the sensor carrier element is formed in one piece with at least one, preferably each sensor socket. In this case, for example, the sensor carrier unit may be formed as a cast component.

Bei einer alternativen Ausgestaltung weist das Sensorträgerelement in Zuordnung zu wenigstens einem, vorzugsweise jedem Sensorstutzen ein Stutzenanlageplateau zur Anlage wenigstens eines von dem Sensorträgerelement separat ausgebildeten Sensorstutzens auf.In an alternative embodiment, the sensor support element in association with at least one, preferably each sensor nozzle on a Stutzenanlageplateau for conditioning at least one of the sensor support member separately formed sensor nozzle.

Um eine definierte Positionierung eines jeweiligen Sensorstutzens bezüglich des Sensorelements gewährleisten zu können, wird vorgeschlagen, dass wenigstens ein, vorzugsweise jeder von dem Sensorträgerelement separat ausgebildete Sensorstutzen einen in eine Positionieröffnung des Sensorträgerelements eingreifend positionierten Positionieransatz umfasst. Dabei kann der Positionieransatz die in dem Sensorstutzen ausgebildete Sensoraufnahme/Meß-Öffnung ringartig umgeben.In order to ensure a defined positioning of a respective sensor nozzle with respect to the sensor element, it is proposed that at least one, Preferably, each of the sensor support member separately formed sensor neck comprises a positioning in a positioning of the sensor support member engaging positioning positioning approach. In this case, the positioning approach can surround the sensor receptacle / measuring opening formed in the sensor neck like a ring.

Für eine stabile Anbindung eines jeweiligen Sensorstutzens an das Sensorträgerelement wird vorgeschlagen, dass an wenigstens einem, vorzugsweise jedem von dem Sensorträgerelement separat ausgebildeten Sensorstutzen ein Anlagewulst zur Anlage des Sensorstutzens an dem zugeordneten Sensoranlageplateau vorgesehen ist. Vorzugsweise umgibt der Anlagewulst den an dem Sensorstutzen ausgebildeten Positionieransatz ringartig.For a stable connection of a respective sensor nozzle to the sensor carrier element is proposed that on at least one, preferably each of the sensor support member separately formed sensor nozzle is provided a Anlagewulst for conditioning of the sensor nozzle at the associated Sensoranlageplateau. The abutment bead preferably surrounds the positioning shoulder formed on the sensor neck like a ring.

Eine bei den auftretenden thermischen bzw. mechanischen Belastungen stabile Anbindung eines jeweiligen Sensorstutzens an das Sensorträgerelement kann dadurch erreicht werden, dass wenigstens ein, vorzugsweise jeder von dem Sensorträgerelement separat ausgebildete Sensorstutzen mit dem Sensorträgerelement durch Verschweißen, vorzugsweise Kondensatorentladungsschweißen, verbunden ist.A connection of a respective sensor connection piece to the sensor support element, which is stable in the case of thermal or mechanical loads, can be achieved by connecting at least one, preferably each sensor connection piece formed separately from the sensor support element to the sensor support element by welding, preferably capacitor discharge welding.

Auch das Sensorträgerelement kann mit dem abgasführenden Element durch Verschweißen, vorzugsweise Laserschweißen, MAG-Schweißen oder Kondensatorentladungsschweißen, verbunden sein.Also, the sensor support member may be connected to the exhaust gas-carrying element by welding, preferably laser welding, MAG welding or capacitor discharge welding.

Bei einer auch aufgrund der Herstellungskosten vorteilhaften Ausgestaltung kann das Sensorträgerelement als Blechumformteil ausgebildet sein.In an embodiment which is also advantageous on account of the manufacturing costs, the sensor carrier element can be formed as a sheet-metal forming part.

Die Erfindung betrifft ferner eine Sensorträgereinheit, insbesondere für eine erfindungsgemäß aufgebaute Abgasanlage, umfassend ein an einem abgasführenden Element festzulegendes Sensorträgerelement und an dem Sensorträgerelement eine Mehrzahl von mit Sensoren bestückbaren Sensorstutzen jeweils mit wenigstens einer darin ausgebildeten Sensoraufnahme/Meß-Öffnung. Eine derartige Sensorträgereinheit kann mit den vorangehend erläuterten, und für diese spezifischen Merkmalen einzeln oder in beliebiger Kombination ausgebildet sein.The invention further relates to a sensor carrier unit, in particular for an exhaust system constructed according to the invention, comprising a sensor carrier element to be fixed to an exhaust gas-carrying element and to the sensor carrier element a plurality of sensor sockets which can be equipped with sensors each having at least one sensor receiver / measuring aperture formed therein. Such a sensor carrier unit can with the previously explained, and for these specific features may be formed individually or in any combination.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegenden Figuren detailliert beschrieben. Es zeigt:

Fig. 1
eine Abgasanlage für eine Brennkraftmaschine eines Fahrzeugs;
Fig. 2
eine Sensorträgereinheit der Abgasanlage der Fig. 1 in perspektivischer Ansicht;
Fig. 3
eine Längsschnittansicht der Sensorträgereinheit der Fig. 2;
Fig. 4
eine Seitenansicht der Sensorträgereinheit der Fig. 2;
Fig. 5
eine Draufsicht auf die Sensorträgereinheit der Fig. 2;
Fig. 6
eine Ansicht der Sensorträgereinheit der Fig. 2 in Blickrichtung VI in Fig. 2;
Fig. 7
eine Querschnittansicht der Sensorträgereinheit der Fig. 2, geschnitten längs einer Linie VII-VII in Fig. 5.
The present invention will be described below in detail with reference to the accompanying drawings. It shows:
Fig. 1
an exhaust system for an internal combustion engine of a vehicle;
Fig. 2
a sensor carrier unit of the exhaust system of Fig. 1 in perspective view;
Fig. 3
a longitudinal sectional view of the sensor carrier unit of Fig. 2 ;
Fig. 4
a side view of the sensor carrier unit of Fig. 2 ;
Fig. 5
a plan view of the sensor carrier unit of Fig. 2 ;
Fig. 6
a view of the sensor carrier unit of Fig. 2 in viewing direction VI in Fig. 2 ;
Fig. 7
a cross-sectional view of the sensor carrier unit of Fig. 2 , taken along a line VII-VII in Fig. 5 ,

In Fig. 1 ist eine Abgasanlage für eine Brennkraftmaschine eines Kraftfahrzeugs allgemein mit 10 bezeichnet. Die Abgasanlage 10 umfasst in einem stromaufwärtigen Bereich eine Abgasnachbehandlungseinheit 12, beispielsweise eine SCR-Katalysatoreinheit, in welche das von einer Brennkraftmaschine abgegebene Abgas A eingeleitet wird. Ein rohrartiges abgasführendes Element 14 führt das aus der Abgasnachbehandlungseinheit 12 ausgestoßene Abgas zu einer beispielsweise in einem stromabwärtigen Endbereich der Abgasanlage 10 angeordneten Schalldämpfereinheit 16. Über Endrohre 18 wird das Abgas zur Umgebung hin abgegeben.In Fig. 1 an exhaust system for an internal combustion engine of a motor vehicle is generally designated 10. The exhaust system 10 comprises in an upstream region an exhaust gas aftertreatment unit 12, for example an SCR catalyst unit, into which the exhaust gas A emitted by an internal combustion engine is introduced. A tube-like exhaust gas-carrying element 14 leads the exhaust gas discharged from the exhaust gas after-treatment unit 12 to a muffler unit 16 arranged, for example, in a downstream end region of the exhaust system 10. The exhaust gas is discharged to the surroundings via tailpipes 18.

In einem beispielsweise an die Abgasnachbehandlungseinheit 12 anschließenden Bereich des rohrartigen Abgasführungselements 14 ist eine nachfolgend mit Bezug auf die Fig. 2 bis 7 detailliert beschriebene Sensorträgereinheit 20 vorgesehen. Die Sensorträgereinheit 20 umfasst im dargestellten Beispiel ein beispielsweise als Blechumformteil ausgebildetes Sensorträgerelement 22. Die Kontur bzw. Formgebung des Sensorträgerelements 22 ist an die Kontur des abgasführenden Elements 14 in dem die Sensorträgereinheit 20 aufnehmenden Bereich angepasst. Im dargestellten Beispiel weist das langgestreckte Sensorträgerelement 22 eine an die beispielsweise kreisartig gekrümmte Außenkontur des abgasführenden Elements 14 angepasste gekrümmte Gestalt auf.In a subsequent to the exhaust aftertreatment unit 12, for example, region of the tubular exhaust gas guide element 14 is a below with reference to the Fig. 2 to 7 sensor carrier unit 20 described in detail provided. In the example shown, the sensor carrier unit 20 comprises a sensor carrier element 22 designed, for example, as a sheet-metal forming part. The contour or shaping of the sensor carrier element 22 is adapted to the contour of the exhaust-gas-carrying element 14 in the region accommodating the sensor carrier unit 20. In the example shown, the elongated sensor carrier element 22 has a curved shape adapted to the, for example, circularly curved outer contour of the exhaust gas-carrying element 14.

An dem langgestreckten Sensorträgerelement 22 sind im dargestellten Beispiel drei in einer Linie aufeinanderfolgend angeordnete Sensorstutzen 24, 26, 28 vorgesehen. Jeder Sensorstutzen 24, 26, 28 stellt eine Sensoraufnahme/Mess-Öffnung 30 bereit, in welche ein Sensor eingesetzt werden kann und durch welche hindurch der Sensor in Messwechselwirkung mit dem im abgasführenden Element 14 strömenden Abgas treten kann. Beispielsweise kann für eine stabile und gasdichte Aufnahme eines Sensors in einer jeweiligen Sensoraufnahme/Mess-Öffnung 30 diese zumindest bereichsweise mit einem Innengewinde 31 ausgebildet sein, in welches ein entsprechendes Außengewinde des darin aufzunehmenden Sensors eingeschraubt werden kann. Anschließend an diesen Innengewindebereich kann eine jeweilige Sensoraufnahme/Mess-Öffnung 30 einen ringartigen Bodenbereich 32 aufweisen, an welchem der darin aufgenommene Sensor über ein beispielsweise O-ringartiges Dichtelement oder dergleichen sich abstützen kann. Um die Sensoraufnahmestutzen 24, 26, 28 in der erforderlichen Präzision bereitstellen zu können, können diese beispielsweise als in spanabhebender Bearbeitung hergestellte Metallbauteile ausgebildet sein.In the example shown, three sensor sockets 24, 26, 28 arranged successively in a line are provided on the elongated sensor carrier element 22. Each sensor nozzle 24, 26, 28 provides a sensor receptacle / measuring opening 30 into which a sensor can be inserted and through which the sensor can interact with the exhaust gas flowing in the exhaust gas-carrying element 14 in measuring interaction. For example, for a stable and gas-tight reception of a sensor in a respective sensor receptacle / measuring opening 30, this can be formed at least in regions with an internal thread 31 into which a corresponding external thread of the sensor to be received therein can be screwed. Subsequent to this internally threaded area, a respective sensor receptacle / measuring opening 30 can have an annular bottom area 32, on which the sensor accommodated therein can be supported by way of an example O-ring-like sealing element or the like. In order to be able to provide the sensor receiving sockets 24, 26, 28 with the required precision, they can be designed, for example, as metal components produced by machining.

In Zuordnung zu jedem der Sensorstutzen 24, 26, 28 ist am Sensorträgerelement 22 ein Stutzenanlageplateau 34 vorgesehen. In jedem Stutzenanlageplateau 34, das einen im Wesentlichen ungekrümmten, ebenen Anlagebereich für einen jeweils zugeordneten Sensorstutzen 24, 26, 28 bereitstellt, ist eine Positionieröffnung 36 zur Aufnahme eines an den jeweiligen Sensorstutzen 24, 26, 28 vorgesehenen, die Sensoraufnahme/Mess-Öffnung ringartig bzw. im Wesentlichen zylindrisch umgebenden Positionieransatzes 38 vorgesehen. Dabei können die Innenabmessung der Positionieröffnung 36 und die Außenabmessung des Positionieransatzes 38 derart aufeinander abgestimmt sein, dass eine nahezu spielfreie und somit eine definierte Positionierung für einen jeweiligen Sensorstutzen 24, 26, 28 vorgebende Eingriffswechselwirkung erreicht wird.In association with each of the sensor sockets 24, 26, 28, a sump installation plateau 34 is provided on the sensor support element 22. In each nozzle attachment platform 34, which provides a substantially non-curved, flat abutment region for a respective associated sensor nozzle 24, 26, 28, a positioning opening 36 for receiving a at the respective sensor nozzle 24, 26, 28 provided, the Sensor receptacle / measuring opening ring-like or substantially cylindrical surrounding Positionieransatzes 38 provided. In this case, the inner dimensions of the positioning opening 36 and the outer dimensions of the positioning projection 38 can be matched to one another in such a way that a virtually backlash-free and thus a defined positioning for a respective sensor socket 24, 26, 28 predetermined engagement interaction is achieved.

Die Sensorstutzen 24, 26, 28 liegen an den diesen jeweils zugeordneten Stutzenanlageplateaus 34 des Sensorträgerelements 22 vorzugsweise über einen den Positionieransatz 38 bzw. die Sensoraufnahme/Mess-Öffnung 30 ringartig umgebenden Anlagewulst 40 an. Somit wird eine über den gesamten Umfang um die Sensoraufnahme/Mess-Öffnung herum durchlaufende, linienartige Anlagewechselwirkung zwischen einem jeweiligen Sensorstutzen 24, 26, 28 und einem jeweiligen Stutzenanlageplateau 34 erreicht. Dies ist besonders dann von Vorteil, wenn die Sensorstutzen 24, 26, 28 mit dem Sensorträgerelement durch Kondensatorentladungsschweißen miteinander verbunden werden. Ein derartiges Schweißverfahren ist besonders daher vorteilhaft, da damit eine auch unter den im Betrieb einer Brennkraftmaschine zu erwartenden thermischen und mechanischen Belastungen sehr stabile Verbindung der Sensorstutzen 24, 26, 28 mit dem Sensorträgerelement 22 gewährleistet. Der Aufbau der Sensorträgereinheit 20 unter Einsatz eines derartigen Schweißverfahrens ist leicht durchzuführen, da die miteinander zu verschweißenden Komponenten, nämlich die Sensorstutzen 24, 26, 28 einerseits und das Sensorträgerelement 22 andererseits, unter Einsatz entsprechender Werkzeuge leicht gegeneinander gepresst werden können, um den für die Durchführung eines Kondensatorentladungsschweißvorgangs erforderlichen Anpressdruck zu gewährleisten. Ferner führt der Einsatz eines derartigen Kondensatorentladungsschweißverfahrens zu nahezu keinem Schweißverzug an den miteinander zu verbindenden Bauteilen, so dass diese mit der aus dem jeweiligen Herstellungsvorgang hervorgehenden und für die Anbindung an das abgasführende Element 14 einerseits bzw. die Aufnahme von Sensoren andererseits mit hoher Präzision bereitgestellten Formgebung auch nach Durchführung des Kondensatorentladungsschweißvorgangs zur Verfügung stehen.The sensor sockets 24, 26, 28 abut on the respective nozzle attachment plateaus 34 of the sensor carrier element 22 which are respectively assigned thereto via an abutment bead 40 which surrounds the positioning attachment 38 or the sensor receptacle / measuring opening 30 in an annular manner. Thus, a line-like system interaction between a respective sensor nozzle 24, 26, 28 and a respective nozzle attachment platform 34 is achieved over the entire circumference around the sensor receptacle / measuring aperture. This is particularly advantageous when the sensor sockets 24, 26, 28 are connected to the sensor support element by capacitor discharge welding. Such a welding method is particularly advantageous because it ensures a very stable connection of the sensor sockets 24, 26, 28 with the sensor support element 22 even under the thermal and mechanical loads expected during operation of an internal combustion engine. The structure of the sensor carrier unit 20 using such a welding method is easy to carry out, since the components to be welded together, namely the sensor nozzle 24, 26, 28 on the one hand and the sensor carrier element 22 on the other hand, using appropriate tools can be easily pressed against each other to those for the Performing a capacitor discharge welding process required to ensure contact pressure. Furthermore, the use of such a capacitor discharge welding process leads to virtually no welding distortion on the components to be joined together, so that this with the resulting from the respective manufacturing process and for the connection to the exhaust gas carrying element 14 on the one hand or the recording of sensors on the other hand provided with high precision shaping be available even after performing the capacitor discharge welding process.

Die eine Mehrzahl von Sensorstutzen 24, 26, 28 aufweisende Sensorträgereinheit 20 kann in ihrer Gesamtheit in den Herstellungsprozess einer Abgasanlage eingeführt werden, so dass bei diesem Herstellungsprozess nur ein einziger Verbindungsvorgang durchzuführen ist, um mehrere Sensorstutzen 24, 26, 28 an die abgasführende Komponente 14 der Abgasanlage 10 festzulegen. Auch dabei wird vorzugsweise eine materialschlüssige Verbindung durch Verschweißung hergestellt. Hierzu wird vorzugsweise ein Laserschweißvorgang oder ein MAG-Schweißvorgang, also ein Schutzgasschweißvorgang, durchgeführt. Bei derartigen Schweißverfahren ist ein vergleichsweise hoher Anpressdruck zwischen den zu verschweißenden Bauteilen, wie diese bei einem Kondensatorentladungsschweißvorgang erforderlich ist, nicht nötig. Somit besteht nicht die Gefahr, dass durch einen übermäßig großen Druck die rohrartig ausgebildete Abgasführungskomponente 14, welche in demjenigen Bereich, in welchem die Sensorträgereinheit 20 festzulegen ist, durch das Einbringen einer durch die Sensorträgereinheit 20 zu überdeckenden Öffnung zusätzlich geschwächt ist, nicht auftreten kann. Insbesondere dann, wenn im Bereich der abgasführenden Komponente 14 Zugriff für entsprechende Abstützwerkzeuge vorhanden ist oder diese aufgrund ihrer baulichen Ausgestaltung entsprechend stabil ist, kann selbstverständlich auch zur Anbindung der Sensorträgereinheit 20 an die abgasführende Komponente 14 ein Kondensatorentladungsschweißvorgang eingesetzt werden.The sensor carrier unit 20 having a plurality of sensor sockets 24, 26, 28 can be introduced in their entirety into the manufacturing process of an exhaust system, so that in this manufacturing process only a single connection operation has to be performed to connect a plurality of sensor sockets 24, 26, 28 to the exhaust gas-carrying component 14 the exhaust system 10 set. Also, preferably a material connection is produced by welding. For this purpose, a laser welding process or a MAG welding process, that is to say an inert gas welding process, is preferably carried out. In such welding methods, a comparatively high contact pressure between the components to be welded, as required in a capacitor discharge welding process, is not necessary. Thus, there is no risk that an excessively large pressure, the tube-like exhaust guide component 14, which is additionally weakened in the region in which the sensor support unit 20 is determined by the introduction of an opening to be covered by the sensor support unit 20 opening, can not occur. In particular, if access for corresponding support tools is present in the region of the exhaust-gas-conducting component 14 or if it is correspondingly stable due to its structural design, it is of course also possible to connect the sensor support unit 20 to the exhaust-gas-carrying component 14 using a capacitor discharge welding process.

Wie vor allem die Fig. 2 bis 4 deutlich zeigen, können bei einer erfindungsgemäß aufgebauten Sensorträgereinheit 20 Sensorstutzen verschiedener Bauart vorgesehen werden, um entsprechend verschieden gestaltete Sensoren an einer Abgasanlage vorsehen zu können. Es ist darauf hinzuweisen, dass selbstverständlich auch gleich beschaffene Sensorstutzen an der Sensorträgereinheit vorgesehen sein können oder/und dass beispielsweise auch mehr als drei Sensorstutzen oder auch nur zwei Sensorstutzen an einer Sensorträgereinheit vorgesehen sein können. Grundsätzlich könnte auch in einem einzigen Sensorstutzen die Möglichkeit geschaffen sein, mehrere Sensoren daran festzulegen. Hierzu könnte in einem einzigen Sensorstutzen eine entsprechende Anzahl an den daran festzulegenden Sensoren zugeordneten Sensoraufnahme/Mess-Öffnungen vorgesehen sein.As especially the Fig. 2 to 4 clearly show, in a sensor carrier unit constructed according to the invention 20 sensor nozzles of various types can be provided in order to provide correspondingly differently designed sensors on an exhaust system can. It should be pointed out that, of course, similarly designed sensor sockets may be provided on the sensor carrier unit and / or that, for example, more than three sensor sockets or even only two sensor sockets may be provided on a sensor carrier unit. In principle, the possibility could also be created in a single sensor socket to fix several sensors to it. For this purpose, it would be possible to provide a corresponding number of sensor receptacles / measuring openings assigned to the sensors to be defined in a single sensor socket.

In einer weiteren alternativen Ausgestaltungsart könnte die Sensorträgereinheit als einstückiger Aufbau bereitgestellt werden, bei welchem zumindest einer der Sensorstutzen mit dem Sensorträgerelement integral, also als ein Materialblock, bereitgestellt ist und nicht als separates Bauteil daran festgelegt wird. Beispielsweise kann bei einem derartigen Aufbau die Sensorträgereinheit mit dem Sensorträgerelement und wenigstens einem der Sensorstutzen als Gussbauteil oder ggf. auch als Blechumformbauteil bereitgestellt werden, an welchem durch Umformen und ggf. nachfolgende spanabhebende Bearbeitung die mit einem Innengewinde versehenen Sensorstutzen vorgesehen werden können.In a further alternative embodiment, the sensor carrier unit could be provided as a one-piece construction in which at least one of the sensor stubs is provided integrally with the sensor carrier element, ie as a material block, and is not fixed thereto as a separate component. For example, in such a construction, the sensor carrier unit can be provided with the sensor carrier element and at least one of the sensor stubs as a cast component or possibly also as a sheet metal forming component, to which the sensor stubs provided with an internal thread can be provided by reshaping and optionally subsequent machining.

Claims (13)

Abgasanlage, insbesondere für eine Brennkraftmaschine in einem Fahrzeug, umfassend wenigstens eine an einem abgasführenden Element (14) getragene Sensorträgereinheit (20), wobei die Sensorträgereinheit (20) ein an dem abgasführenden Element (14) festgelegtes Sensorträgerelement (22) und an dem Sensorträgerelement (22) eine Mehrzahl von mit Sensoren bestückten oder bestückbaren Sensorstutzen (24, 26, 28) jeweils mit wenigstens einer darin ausgebildeten Sensoraufnahme/Mess-Öffnung (30) umfasst.Exhaust system, in particular for an internal combustion engine in a vehicle, comprising at least one sensor carrier unit (20) carried on an exhaust-gas-carrying element (14), wherein the sensor carrier unit (20) has a sensor carrier element (22) fixed to the exhaust-gas-carrying element (14) and to the sensor carrier element ( 22) comprises a plurality of sensors (24, 26, 28) equipped with sensors or can be equipped with at least one sensor receptacle / measuring opening (30) formed therein. Abgasanlage nach Anspruch 1, dadurch gekennzeichnet, dass das Sensorträgerelement (22) eine an eine Außenumfangskontur des abgasführenden Elements (14) angepasste Sensorträgerelementenkontur aufweist.Exhaust system according to claim 1, characterized in that the sensor carrier element (22) has a to an outer peripheral contour of the exhaust gas-carrying element (14) adapted sensor carrier element contour. Abgasanlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Sensorträgerelement mit wenigstens einem, vorzugsweise jedem Sensorstutzen einstückig ausgebildet ist.Exhaust system according to claim 1 or 2, characterized in that the sensor support element is formed integrally with at least one, preferably each sensor socket. Abgasanlage nach Anspruch 3, dadurch gekennzeichnet, dass die Sensorträgereinheit als Gussbauteil ausgebildet ist.Exhaust system according to claim 3, characterized in that the sensor carrier unit is designed as a cast component. Abgasanlage nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Sensorträgerelement (22) in Zuordnung zu wenigstens einem, vorzugsweise jedem Sensorstutzen (24, 26, 28) ein Stutzenanlageplateau (34) zur Anlage wenigstens eines von dem Sensorträgerelement (22) separat ausgebildeten Sensorstutzens (24, 26, 28) aufweist.Exhaust system according to one of the preceding claims, characterized in that the sensor carrier element (22) in association with at least one, preferably each sensor nozzle (24, 26, 28) a Stutzenanlageplateau (34) for conditioning at least one of the sensor carrier element (22) separately formed sensor nozzle (24, 26, 28). Abgasanlage nach Anspruch 5, dadurch gekennzeichnet, dass wenigstens ein, vorzugsweise jeder von dem Sensorträgerelement (22) separat ausgebildete Sensorstutzen (24, 26, 28) einen in eine Positionieröffnung (36) des Sensorträgerelements (22) eingreifend positionierten Positionieransatz (38) umfasst.Exhaust system according to claim 5, characterized in that at least one, preferably each of the sensor carrier element (22) separately formed sensor stub (24, 26, 28) into a positioning opening (36) the sensor carrier element (22) engaging positioned positioning approach (38). Abgasanlage nach Anspruch 6, dadurch gekennzeichnet, dass der Positionieransatz (38) die in dem Sensorstutzen (24, 26, 28) ausgebildete Sensoraufnahme/Mess-Öffnung (30) ringartig umgibt.Exhaust system according to claim 6, characterized in that the positioning projection (38) in the sensor socket (24, 26, 28) formed sensor receiving / measuring opening (30) surrounds like a ring. Abgasanlage nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass an wenigstens einem, vorzugsweise jedem von dem Sensorträgerelement (22) separat ausgebildeten Sensorstutzen (24, 26, 28) ein Anlagewulst (40) zur Anlage des Sensorstutzens (24, 26, 28) an dem zugeordneten Sensoranlageplateau (34) vorgesehen ist.Exhaust system according to claim 6 or 7, characterized in that on at least one, preferably each of the sensor support member (22) separately formed sensor stub (24, 26, 28) a Anlagewulst (40) for abutment of the sensor nozzle (24, 26, 28) the associated Sensoranlageplateau (34) is provided. Abgasanlage nach Anspruch 8, dadurch gekennzeichnet, dass der Anlagewulst (40) den an dem Sensorstutzen (24, 26, 28) ausgebildeten Positionieransatz (38) ringartig umgibt.Exhaust system according to claim 8, characterized in that the abutment bead (40) surrounds the positioning neck (38) formed on the sensor neck (24, 26, 28) in an annular manner. Abgasanlage nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, dass wenigstens ein, vorzugsweise jeder von dem Sensorträgerelement (22) separat ausgebildete Sensorstutzen (24, 26, 28) mit dem Sensorträgerelement (22) durch Verschweißen, vorzugsweise Kondensatorentladungsschweißen, verbunden ist.Exhaust system according to one of claims 5 to 9, characterized in that at least one, preferably each of the sensor support element (22) separately formed sensor stub (24, 26, 28) with the sensor support element (22) by welding, preferably capacitor discharge welding, is connected. Abgasanlage nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Sensorträgerelement (22) als Blechumformteil ausgebildet ist.Exhaust system according to one of the preceding claims, characterized in that the sensor carrier element (22) is designed as a sheet metal forming part. Abgasanlage nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Sensorträgerelement (22) mit dem abgasführenden Element (14) durch Verschweißen, vorzugsweise Laserschweißen, MAG-Schweißen oder Kondensatorentladungsschweißen, verbunden ist.Exhaust system according to one of the preceding claims, characterized in that the sensor carrier element (22) is connected to the exhaust gas-carrying element (14) by welding, preferably laser welding, MAG welding or capacitor discharge welding. Sensorträgereinheit, insbesondere für eine Abgasanlage nach einem der vorangehenden Ansprüche, umfassend ein an einem abgasführenden Element (14) festzulegendes Sensorträgerelement (22) und an dem Sensorträgerelement (22) eine Mehrzahl von mit Sensoren bestückbaren Sensorstutzen (24, 26, 28) jeweils mit wenigstens einer darin ausgebildeten Sensoraufnahme/Mess-Öffnung (30).Sensor carrier unit, in particular for an exhaust system according to one of the preceding claims, comprising a sensor carrier element (22) to be fixed to an exhaust gas-carrying element (14) and to the sensor carrier element (22) a plurality of sensor nozzles (24, 26, 28) which can be equipped with sensors, in each case at least a sensor receptacle / measuring opening (30) formed therein.
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US20190264597A1 (en) 2019-08-29
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