EP3530898B1 - Exhaust system - Google Patents

Exhaust system Download PDF

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Publication number
EP3530898B1
EP3530898B1 EP19155476.5A EP19155476A EP3530898B1 EP 3530898 B1 EP3530898 B1 EP 3530898B1 EP 19155476 A EP19155476 A EP 19155476A EP 3530898 B1 EP3530898 B1 EP 3530898B1
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EP
European Patent Office
Prior art keywords
sensor
carrier element
exhaust system
sensor carrier
pipe connection
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EP19155476.5A
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German (de)
French (fr)
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EP3530898A1 (en
Inventor
Benjamin Röhr
Roland Schwarz
Wolfgang Herbst
Frank Berkemer
Tadeusz-Jozef Juroszek
Peter Gorke
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Eberspaecher Exhaust Technology GmbH and Co KG
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Eberspaecher Exhaust Technology GmbH and Co KG
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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
    • 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

  • FR 2 925 586 A3 show exhaust systems in which sensor nozzles are attached directly to exhaust-gas-carrying components.
  • an exhaust system in particular for an internal combustion engine in a vehicle, according to claim 1 at least one sensor carrier unit carried on an exhaust-gas-carrying element, the sensor carrier unit having a sensor carrier element attached to the exhaust-gas-carrying element and a plurality, for example three or at least three, of sensor nozzles equipped with or mountable with sensors, each with at least one sensor holder / measuring Includes opening.
  • a connection of a respective sensor connector to the sensor carrier element that is stable under the occurring thermal or mechanical loads can be achieved in that at least one, preferably each sensor connector formed separately from the sensor carrier element is connected to the sensor carrier element by welding, preferably capacitor discharge welding.
  • the sensor carrier element can also 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 designed as a formed sheet metal part.
  • a sensor carrier unit can with the previously explained and for these specific features can be designed 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 includes an exhaust gas aftertreatment unit 12, for example an SCR catalytic converter unit, into which the exhaust gas A emitted by an internal combustion engine is introduced.
  • a pipe-like exhaust-gas guiding element 14 guides the exhaust gas ejected from exhaust gas aftertreatment unit 12 to a muffler unit 16 arranged, for example, in a downstream end region of exhaust system 10. The exhaust gas is emitted to the environment via tailpipes 18.
  • the sensor carrier unit 20 comprises a sensor carrier element 22 embodied, for example, as a formed sheet metal part.
  • the contour or shape of the sensor carrier element 22 is adapted to the contour of the exhaust-gas guiding element 14 in the area receiving the sensor carrier unit 20.
  • the elongated sensor carrier element 22 has a curved shape that is adapted to the, for example, circularly curved outer contour of the exhaust-gas-conducting element 14.
  • each sensor connector 24, 26, 28 provides a sensor receptacle / measuring opening 30 into which a sensor can be inserted and through which the sensor can enter into measuring interaction with the exhaust gas flowing in the exhaust-gas-carrying element 14.
  • This can be formed at least in some areas with an internal thread 31 into which a corresponding external thread of the sensor to be received can be screwed.
  • a respective sensor receptacle / measuring opening 30 can have a ring-like base area 32, on which the sensor received therein can be supported via an O-ring-like sealing element or the like, for example.
  • the sensor receptacles 24, 26, 28 can be designed, for example, as metal components produced by machining.
  • a nozzle contact plateau 34 is provided on the sensor carrier element 22.
  • each nozzle contact plateau 34 which provides a substantially non-curved, flat contact area for a respectively assigned sensor nozzle 24, 26, 28, there is a positioning opening 36 for receiving one on the respective sensor nozzle 24, 26, 28 which Positioning attachment 38 surrounding the sensor receptacle / measuring opening in a ring-like or essentially cylindrical manner is provided.
  • the inner dimensions of the positioning opening 36 and the outer dimensions of the positioning attachment 38 can be matched to one another in such a way that an almost play-free and thus a defined positioning for a respective sensor connector 24, 26, 28 is achieved.
  • the construction of the sensor carrier unit 20 using such a welding process is easy to carry out, since the components to be welded together, namely the sensor nozzles 24, 26, 28 on the one hand and the sensor carrier element 22 on the other hand, can easily be pressed against each other using appropriate tools in order to achieve the Carrying out a capacitor discharge welding process to ensure the required contact pressure. Furthermore, the use of such a capacitor discharge welding process leads to almost no welding distortion on the components to be connected to one another, so that these with the shape resulting from the respective manufacturing process and for the connection to the exhaust gas-carrying element 14 on the one hand or the reception of sensors on the other hand provided with high precision are also available after the capacitor discharge welding process has been carried out.
  • the sensor carrier unit 20 which has a plurality of sensor nozzles 24, 26, 28, can be introduced in its entirety into the production process of an exhaust system, so that only a single connection process has to be carried out in this production process in order to connect several sensor nozzles 24, 26, 28 to the exhaust-gas component 14 of the exhaust system 10.
  • a material-locking connection is preferably established by welding.
  • a laser welding process or a MAG welding process that is to say an inert gas welding process, is preferably carried out.
  • a comparatively high contact pressure between the components to be welded as is required in a capacitor discharge welding process, is not necessary.
  • Figs. 2 to 4 clearly show that in a sensor carrier unit constructed according to the invention 20 sensor nozzles of different designs can be provided in order to be able to provide sensors of different designs on an exhaust system. It should be pointed out that, of course, identical sensor nozzles can also be provided on the sensor carrier unit and / and that, for example, more than three sensor nozzles or only two sensor nozzles can be provided on a sensor carrier unit. In principle, the possibility could also be created in a single sensor connector to attach several sensors to it. For this purpose, a corresponding number of sensor receptacles / measuring openings assigned to the sensors to be fixed on it could be provided in a single sensor connector.
  • the sensor carrier unit could be provided as a one-piece structure in which at least one of the sensor nozzles is provided integrally with the sensor carrier element, that is, as a block of material, and is not attached to it as a separate component.
  • the sensor carrier unit with the sensor carrier element and at least one of the sensor sockets can be provided as a cast component or possibly also as a sheet metal component, on which the sensor sockets provided with an internal thread can be provided by forming and possibly 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)

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 internal combustion engine used, for example, in a motor vehicle.

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, various sensors, such as a temperature sensor that records the exhaust gas temperature or one or more sensors that record the exhaust gas composition, such as nitrogen oxide sensors, are provided to provide information that is required to reduce pollutant emissions. Such sensors are generally provided on, for example, tubular, exhaust-gas-conducting elements close to exhaust gas aftertreatment systems, such as an SCR catalytic converter arrangement.

Eine Abgasanlage gemäß dem Oberbegriff des Anspruchs 1 ist aus der EP 2 703 615 A1 bekannt. Bei dieser bekannten Abgasanlage sind Sensorstutzen an einem ein Verbindungselement zwischen einem Turbolader und einem Katalysator bereitstellenden abgasführenden Element festgelegt. Dazu weist das gekrümmt ausgebildete abgasführende Element Ausformungen auf, an welchen die Sensorstutzen vorgesehen sind.An exhaust system according to the preamble of claim 1 is from EP 2 703 615 A1 known. In this known exhaust system, sensor nozzles are attached to an exhaust-gas-conducting element providing a connecting element between a turbocharger and a catalytic converter. For this purpose, the curved exhaust-gas-carrying element has formations on which the sensor connectors are provided.

Auch die FR 2 925 586 A3 , US 2017/0081999 A1 und EP 2 868 887 A1 zeigen Abgasanlagen, bei welchen Sensorstutzen direkt an abgasführenden Komponenten festgelegt sind.Also the FR 2 925 586 A3 , US 2017/0081999 A1 and EP 2 868 887 A1 show exhaust systems in which sensor nozzles are attached directly to exhaust-gas-carrying components.

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 the possibility is created in a structurally simple manner to provide the information required for operating the exhaust system or an associated internal combustion engine.

Erfindungsgemäß wird diese Aufgabe gelöst durch eine Abgasanlage, insbesondere für eine Brennkraftmaschine in einem Fahrzeug, gemäß Anspruch 1. Diese umfasst 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, according to claim 1 at least one sensor carrier unit carried on an exhaust-gas-carrying element, the sensor carrier unit having a sensor carrier element attached to the exhaust-gas-carrying element and a plurality, for example three or at least three, of sensor nozzles equipped with or mountable with sensors, each with at least one sensor holder / measuring Includes opening.

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 several sensors on the exhaust system or an exhaust-gas-conducting element thereof. This makes it possible, in association with each individual sensor to be provided, to design the associated sensor connector with high precision and to fix it on the exhaust-gas-conducting element via the sensor carrier unit. Since the sensor support unit itself is not acted upon when the sensor support unit is attached to the exhaust-gas-carrying element, there is no risk of any of the multiple sensor nozzles to be provided being damaged when it is attached to the exhaust-gas-carrying element or, in particular, being fixed in an unsuitable position in relation to other sensor nozzles. Since not every sensor connector has to be fixed individually to an exhaust-gas-carrying element, the handling of the components to be connected to one another is simplified in the manufacture of an exhaust system. The time required to set up an exhaust system can also be reduced, since the sensor carrier unit, which has a plurality of sensor nozzles, can be introduced into the manufacturing process as a prefabricated assembly and connected to the exhaust-gas-carrying element in a single operation.

Um in zuverlässiger Weise einen gegen den Austritt von Abgas dichten Verbund zwischen dem abgasführenden Element und der Sensorträgereinheit vorzusehen, weist das Sensorträgerelement eine an eine Außenumfangskontur des abgasführenden Elements angepasste Sensorträgerelementenkontur auf.In order to reliably provide a bond between the exhaust gas-carrying element and the sensor carrier unit that is tight against the escape of exhaust gas, the sensor carrier element has a sensor carrier element contour that is adapted to an outer circumferential contour of the exhaust gas-carrying element.

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

Das Sensorträgerelement weist in Zuordnung zu wenigstens einem, vorzugsweise jedem Sensorstutzen ein Stutzenanlageplateau zur Anlage wenigstens eines von dem Sensorträgerelement separat ausgebildeten Sensorstutzens auf.The sensor carrier element has, in association with at least one, preferably each, sensor nozzle, a nozzle contact platform for contacting at least one sensor nozzle formed separately from the sensor carrier element.

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 be able to ensure a defined positioning of a respective sensor connector with respect to the sensor element, it is proposed that at least one, preferably each sensor connector formed separately from the sensor carrier element comprises a positioning shoulder that engages in a positioning opening of the sensor carrier element. In this case, the positioning attachment can surround the sensor receptacle / measuring opening formed in the sensor socket in a ring-like manner.

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 connector to the sensor support element, it is proposed that a contact bead be provided on at least one, preferably each sensor connector formed separately from the sensor support element, to allow the sensor connector to rest on the associated sensor contact platform. The contact bead preferably surrounds the positioning attachment formed on the sensor connector in a ring-like manner.

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 connector to the sensor carrier element that is stable under the occurring thermal or mechanical loads can be achieved in that at least one, preferably each sensor connector formed separately from the sensor carrier element is connected to the sensor carrier 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.The sensor carrier element can also 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 due to the manufacturing costs, the sensor carrier element can be designed as a formed sheet metal part.

Eine Sensorträgereinheit kann mit den vorangehend erläuterten und für diese spezifischen Merkmalen einzeln oder in beliebiger Kombination ausgebildet sein.A sensor carrier unit can with the previously explained and for these specific features can be designed 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 is described in detail below with reference to the accompanying figures. 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 the 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 line of sight VI in Fig. 2 ;
Fig. 7
a cross-sectional view of the sensor carrier unit of Fig. 2 , cut 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. In an upstream region, the exhaust system 10 includes an exhaust gas aftertreatment unit 12, for example an SCR catalytic converter unit, into which the exhaust gas A emitted by an internal combustion engine is introduced. A pipe-like exhaust-gas guiding element 14 guides the exhaust gas ejected from exhaust gas aftertreatment unit 12 to a muffler unit 16 arranged, for example, in a downstream end region of exhaust system 10. The exhaust gas is emitted to the environment 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 region of the pipe-like exhaust gas routing element 14 adjoining the exhaust gas aftertreatment unit 12, for example, one is described below with reference to FIG Figures 2 to 7 Sensor carrier unit 20 described in detail is provided. In the example shown, the sensor carrier unit 20 comprises a sensor carrier element 22 embodied, for example, as a formed sheet metal part. The contour or shape of the sensor carrier element 22 is adapted to the contour of the exhaust-gas guiding element 14 in the area receiving the sensor carrier unit 20. In the example shown, the elongated sensor carrier element 22 has a curved shape that is adapted to the, for example, circularly curved outer contour of the exhaust-gas-conducting 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 nozzles 24, 26, 28 arranged one after the other in a line are provided on the elongated sensor carrier element 22. Each sensor connector 24, 26, 28 provides a sensor receptacle / measuring opening 30 into which a sensor can be inserted and through which the sensor can enter into measuring interaction with the exhaust gas flowing in the exhaust-gas-carrying element 14. For example, for a stable and gas-tight reception of a sensor in a respective sensor receptacle / measurement opening 30, this can be formed at least in some areas with an internal thread 31 into which a corresponding external thread of the sensor to be received can be screwed. Subsequent to this internal thread area, a respective sensor receptacle / measuring opening 30 can have a ring-like base area 32, on which the sensor received therein can be supported via an O-ring-like sealing element or the like, for example. In order to be able to provide the sensor receptacles 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 nozzles 24, 26, 28, a nozzle contact plateau 34 is provided on the sensor carrier element 22. In each nozzle contact plateau 34, which provides a substantially non-curved, flat contact area for a respectively assigned sensor nozzle 24, 26, 28, there is a positioning opening 36 for receiving one on the respective sensor nozzle 24, 26, 28 which Positioning attachment 38 surrounding the sensor receptacle / measuring opening in a ring-like or essentially cylindrical manner is provided. The inner dimensions of the positioning opening 36 and the outer dimensions of the positioning attachment 38 can be matched to one another in such a way that an almost play-free and thus a defined positioning for a respective sensor connector 24, 26, 28 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 nozzles 24, 26, 28 rest on the respective nozzle contact plateaus 34 of the sensor carrier element 22, preferably via a contact bead 40 surrounding the positioning attachment 38 or the sensor receptacle / measuring opening 30 in a ring-like manner. A line-like contact interaction between a respective sensor connector 24, 26, 28 and a respective connector contact plateau 34 is thus achieved over the entire circumference around the sensor receptacle / measuring opening. This is particularly advantageous if the sensor stubs 24, 26, 28 are connected to the sensor carrier element by capacitor discharge welding. Such a welding process is particularly advantageous because it ensures a very stable connection of the sensor connectors 24, 26, 28 to the sensor carrier element 22 even under the thermal and mechanical loads to be expected during operation of an internal combustion engine. The construction of the sensor carrier unit 20 using such a welding process is easy to carry out, since the components to be welded together, namely the sensor nozzles 24, 26, 28 on the one hand and the sensor carrier element 22 on the other hand, can easily be pressed against each other using appropriate tools in order to achieve the Carrying out a capacitor discharge welding process to ensure the required contact pressure. Furthermore, the use of such a capacitor discharge welding process leads to almost no welding distortion on the components to be connected to one another, so that these with the shape resulting from the respective manufacturing process and for the connection to the exhaust gas-carrying element 14 on the one hand or the reception of sensors on the other hand provided with high precision are also available after the capacitor discharge welding process has been carried out.

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, which has a plurality of sensor nozzles 24, 26, 28, can be introduced in its entirety into the production process of an exhaust system, so that only a single connection process has to be carried out in this production process in order to connect several sensor nozzles 24, 26, 28 to the exhaust-gas component 14 of the exhaust system 10. Here, too, a material-locking connection is preferably established 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 welding processes of this type, a comparatively high contact pressure between the components to be welded, as is required in a capacitor discharge welding process, is not necessary. Thus, there is no risk that the exhaust gas routing component 14, which is of tubular design and which is additionally weakened by the introduction of an opening to be covered by the sensor carrier unit 20 in the area in which the sensor carrier unit 20 is to be fixed, cannot occur due to an excessively high pressure. In particular, if there is access for corresponding support tools in the area of the exhaust gas-carrying component 14 or if this is correspondingly stable due to its structural design, a capacitor discharge welding process can of course also be used to connect the sensor carrier unit 20 to the exhaust-gas-carrying component 14.

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.Like especially those Figs. 2 to 4 clearly show that in a sensor carrier unit constructed according to the invention 20 sensor nozzles of different designs can be provided in order to be able to provide sensors of different designs on an exhaust system. It should be pointed out that, of course, identical sensor nozzles can also be provided on the sensor carrier unit and / and that, for example, more than three sensor nozzles or only two sensor nozzles can be provided on a sensor carrier unit. In principle, the possibility could also be created in a single sensor connector to attach several sensors to it. For this purpose, a corresponding number of sensor receptacles / measuring openings assigned to the sensors to be fixed on it could be provided in a single sensor connector.

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 structure in which at least one of the sensor nozzles is provided integrally with the sensor carrier element, that is, as a block of material, and is not attached to it as a separate component. For example, with such a structure, the sensor carrier unit with the sensor carrier element and at least one of the sensor sockets can be provided as a cast component or possibly also as a sheet metal component, on which the sensor sockets provided with an internal thread can be provided by forming and possibly subsequent machining.

Claims (11)

  1. Exhaust system, especially for an internal combustion engine in a vehicle, comprising an exhaust gas-carrying element (14), and sensor pipe connections (24, 26, 26) which are fitted or can be fitted with sensors, with at least one respective sensor-mounting/measuring opening (30) formed therein, characterized by at least one sensor carrier unit (20) carried on the exhaust gas-carrying element (14), with a sensor carrier element (22) fixed to the exhaust gas-carrying element (14), adapted to an outer circumferential contour of the exhaust gas-carrying element (14) and comprising a plurality of sensor pipe connections (24, 26, 26) and in that the sensor carrier element (22) has, in association with at least one sensor pipe connection (24, 26, 28) formed separately from the sensor carrier element (22) a pipe connection contact plateau (34) for contacting said sensor pipe connection (24, 26, 28).
  2. Exhaust system in accordance with claim 1, characterized in that the sensor carrier element is made in one piece with at least one sensor pipe connection.
  3. Exhaust system in accordance with claim 2, characterized in that the sensor carrier element is adapted as a cast component.
  4. Exhaust system in accordance with one of the above claims, characterized in that the sensor carrier element (22) comprises, in association with each of the plurality of sensor pipe connections (24, 26, 28), a pipe connection contact plateau (34).
  5. Exhaust system in accordance with one of the above claims, characterized in that at least one and preferably each sensor pipe connection (24, 26, 28) formed separately from the sensor carrier element (22) comprises a positioning projection (38) positioned such that it meshes with a positioning opening (36) of the sensor carrier element (22).
  6. Exhaust system in accordance with claim 5, characterized in that the positioning projection (38) surrounds the sensor-mounting/measuring opening (30) formed in the sensor pipe connection (24, 26, 28) in a ring-shaped manner.
  7. Exhaust system in accordance with claim 5 or 6, characterized in that a contact bead (40) is provided on at least one and preferably each sensor pipe connection (24, 26, 28) formed separately from the sensor carrier element (22) for contacting the sensor pipe connection (24, 26, 28) with the associated sensor contact plateau (34).
  8. Exhaust system in accordance with claim 7, characterized in that the contact bead (40) surrounds the positioning projection (38) formed on the sensor pipe connection (24, 26, 28) in a ring-shaped manner.
  9. Exhaust system in accordance with one of the claims 1 to 8, characterized in that at least one and preferably each sensor pipe connection (24, 26, 28) formed separately from the sensor carrier element (22) is connected to the sensor carrier element (22) by welding, preferably capacitor discharge welding.
  10. Exhaust system in accordance with one of the above claims, characterized in that the sensor carrier element (22) is configured as a shaped sheet metal part.
  11. Exhaust system in accordance with one of the above 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.
EP19155476.5A 2018-02-26 2019-02-05 Exhaust system Active EP3530898B1 (en)

Applications Claiming Priority (1)

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DE102018104244.2A DE102018104244A1 (en) 2018-02-26 2018-02-26 exhaust system

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EP3530898A1 EP3530898A1 (en) 2019-08-28
EP3530898B1 true EP3530898B1 (en) 2020-09-30

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EP4112891A1 (en) * 2021-06-30 2023-01-04 CNH Industrial Belgium N.V. A muffler comprising one or more sensor ports

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CN110195636A (en) 2019-09-03
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CN110195636B (en) 2021-08-03
US20190264597A1 (en) 2019-08-29
US10781740B2 (en) 2020-09-22

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