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WO2009021783A1 - Exhaust system and method for operating the exhaust system - Google Patents

Exhaust system and method for operating the exhaust system Download PDF

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Publication number
WO2009021783A1
WO2009021783A1 PCT/EP2008/058834 EP2008058834W WO2009021783A1 WO 2009021783 A1 WO2009021783 A1 WO 2009021783A1 EP 2008058834 W EP2008058834 W EP 2008058834W WO 2009021783 A1 WO2009021783 A1 WO 2009021783A1
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WO
WIPO (PCT)
Prior art keywords
exhaust
bypass
exhaust system
diagnosis
flow element
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.)
Ceased
Application number
PCT/EP2008/058834
Other languages
German (de)
French (fr)
Inventor
Jens Schneider
Thomas Harrer
Anton Hans
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2009021783A1 publication Critical patent/WO2009021783A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to an exhaust system according to the preamble of claim 1.
  • JP-08254145 A which has an exhaust pipe with at least one catalyst and a parallel to the exhaust pipe bypass, wherein an input into the bypass by means of a first flap can be closed.
  • the catalyst is provided in parallel to the bypass extending parallel portion of the exhaust pipe, wherein an input in this parallel section is closable by means of a second flap and wherein in this parallel section downstream of the second flap and upstream of the catalyst, a lambda probe is arranged.
  • the diagnostic sensors have partially protective tubes and / or protective layers to protect the diagnostic sensor from the harmful environmental conditions.
  • the exhaust system according to the invention with the characterizing features of claim 1 has the advantage that the life of the at least one diagnostic sensor is extended and the high accuracy of the diagnostic sensor is maintained by this is only temporarily exposed to the hot exhaust gas.
  • bypass formed by a provided in a wall of the exhaust pipe bulge which is flow-connected via an opening with the exhaust pipe, wherein by means of the flow element exhaust gas in the bulge can be conducted. In this way, a very space-saving arrangement of the bypass is achieved.
  • the flow element is designed as a flap or slider and adjustable by means of an actuator.
  • FIG. 1 shows an exhaust system according to the invention of an internal combustion engine according to a first
  • FIG. 2 shows an exhaust system according to the invention of an internal combustion engine according to a second embodiment
  • FIG. 3 shows an exhaust system according to the invention of an internal combustion engine according to a third
  • FIG. 1 shows in simplified form an exhaust system according to the invention of an internal combustion engine according to a first exemplary embodiment.
  • the internal combustion engine 1 has an exhaust system 2 which has at least one exhaust gas sensor 3 for regulating the internal combustion engine 1, for example a lambda sensor, and at least one diagnostic sensor 4 for gas-selective diagnosis of the exhaust gas composition, for example a carbon monoxide, hydrocarbon, nitrogen oxide or particle sensor.
  • at least one exhaust gas sensor 3 for regulating the internal combustion engine 1, for example a lambda sensor
  • at least one diagnostic sensor 4 for gas-selective diagnosis of the exhaust gas composition, for example a carbon monoxide, hydrocarbon, nitrogen oxide or particle sensor.
  • the exhaust gas sensor 3 and the diagnostic sensor 4 are each connected via a signal line 5 to a motor controller 6.
  • the diagnosis of the exhaust gas composition is made by the
  • the diagnostic sensor 4 is ready for measurement only in these diagnostic phases, for example.
  • the exhaust system 2 has at least one exhaust pipe 10 and in each case at least one provided in the exhaust pipe 10 catalyst 11. According to the exemplary embodiment, two catalysts 11 are provided, a pre-catalyst 11.1 and a Nachkatalysator 11.2. Between the catalyst 11.1 and the catalyst 11.1 could be arranged a particulate filter.
  • the at least one exhaust gas sensor 3 is arranged, for example, upstream of the primary catalytic converter 11.1.
  • the at least one diagnostic sensor 4 is arranged downstream of the last catalyst 11.2, as seen in the flow direction, but could also be provided between the two catalytic converters 11.1, 11.2.
  • the exhaust system 2 has a bypass 12 extending in parallel to the exhaust pipe 10, which is flow-connected to the exhaust pipe 10 via an inlet 12.1 and an outlet 12.2, wherein the inlet 12.1 can be closed or throttled into the bypass line 12 by means of a flow element 13.
  • the flow element 13 is a flap, a slider or other valve and is adjusted by means of an actuator 14, which is for example a magnet.
  • the output 12.2 can be closed with a further flow element, not shown.
  • the input 12.1 could also have a constriction.
  • the bypass 12 downstream of the postcatalyst 11.2. or the precatalyst 11.1 provided and in the bypass 12 of the at least one diagnostic sensor 4 is arranged for gas-selective diagnosis of the exhaust gas composition.
  • the bypass 12 is formed in that the exhaust pipe 10 branches in sections into two parallel sections 10.1,10.2, which unite downstream again to form a single section.
  • One of the parallel sections 10.1, 10.2 is the bypass 12.
  • the bypass 12 extends only in sections along the exhaust pipe 10 and, for example, has a smaller flow cross-section than the other parallel section 10.1, 10.2.
  • the bypass 12 is welded or screwed to the exhaust pipe 10, for example.
  • the diagnostic sensor 4 projects into the bypass 12 with a measuring section.
  • the flow element 13 is temporarily opened for a diagnosis of the exhaust system 2 to be carried out with the diagnostic sensor 4 and closed again after the diagnosis has been completed. This ensures that the diagnostic sensor 4 is exposed to the exhaust gas only during the diagnosis and is flown by this. Outside the diagnostic phase of the
  • the diagnostic probe "detrimental" operating conditions of the engine for example, at full load or catalyst regeneration to close the flow element 13 and thus interrupt the flow of the diagnostic probe 4 and in all other operating conditions, the flow element 13 to open hold.
  • the life or duration of use of the diagnostic sensor 4 is significantly increased in this way in both cases.
  • high measurement accuracy can be maintained over a longer period of operation than in the prior art.
  • FIG. 2 shows in simplified form an exhaust system according to the invention of an internal combustion engine according to a second exemplary embodiment.
  • the exhaust system according to FIG. 2 differs from the first exemplary embodiment in that the branching into the bypass 12 is Y-shaped.
  • FIG 3 shows a simplified exhaust system according to the invention of an internal combustion engine according to a third embodiment.
  • the exhaust system according to FIG. 3 differs from the exhaust systems according to FIGS. 2 and 3 in that the bypass 12 is formed by a bulge 17 provided in a wall 10. 3 of the exhaust pipe 10, which is flow-connected to the exhaust pipe 10 via an opening 17 is, by means of the flow element 13 exhaust gas into the bulge 17 is conductive.
  • the bulge 17 fluidly represents a Totwasser which and is formed chamber-shaped.
  • the opening 17.1 can be closed by means of the flow element 13, whereby the diagnostic sensor 4 is separated from the exhaust pipe 10 flow.
  • the opened opening 17.1 is divided by the flow element 13 into the inlet 12.1 and the outlet 12.2 of the bypass 12, this being arranged, for example, in the region of the opening 17.1.
  • both the input 12.1 and the output 12.2 are opened or closed with a single flow element 13.
  • the flow element 13 projects, for example, obliquely into the exhaust pipe 10 and in this way directs a portion of the exhaust gas into the bulge 17, which, viewed in the flow direction, flows back into the exhaust pipe 10 behind the flow element 13.
  • the bulge 17 is integrally formed on the exhaust pipe 10 or attached to the exhaust pipe 10 as a separate component.
  • the diagnostic sensor 4 protrudes with its measuring section into the bypass 12. For example, it is arranged such that it extends with its longitudinal extent in the direction of the exhaust pipe 10.

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

Abstract

Exhaust systems for internal combustion engines are already known which have an exhaust pipe with a main section, which has at least one catalytic converter, and a bypass section which runs parallel to the main section, wherein an inlet into the bypass line can be closed off by means of a first flap. The catalytic converter is provided in the main section which runs parallel to the bypass section, wherein an inlet into said main section can be closed off by means of a second flap and wherein a lambda probe is arranged in said main section downstream of the second flap and upstream of the catalytic converter. Furthermore, exhaust systems are known which have diagnosis sensors which are permanently exposed to the exhaust gas. As a result of the harsh ambient conditions in the exhaust pipe, the diagnosis sensors experience so-called signal drift after a certain period of time, which causes the measurement accuracy to become increasingly impaired. This leads to a shortening of the service life of the diagnosis sensors. The diagnosis sensors have, in part, protective tubes and/or protective coatings which are intended to protect the diagnosis sensor from the damaging ambient conditions. In the exhaust system according to the invention, the service life of the at least one diagnosis sensor is increased. According to the invention, it is provided that the bypass (12) is provided downstream of the at least one catalytic converter (11), and at least one diagnosis sensor (4) for determining the exhaust-gas composition is arranged in the bypass (12).

Description

Beschreibung description

Titeltitle

Abgasanlage und Verfahren zum Betrieb der AbgasanlageExhaust system and method for operating the exhaust system

Stand der TechnikState of the art

Die Erfindung geht aus von einer Abgasanlage nach dem Oberbegriff des Anspruchs 1.The invention relates to an exhaust system according to the preamble of claim 1.

Es ist schon eine Abgasanlage für eine Brennkraftmaschine aus der JP-08254145 A bekannt, die ein Abgasrohr mit zumindest einem Katalysator und einen parallel zum Abgasrohr verlaufenden Bypass aufweist, wobei ein Eingang in den Bypass mittels einer ersten Klappe verschließbar ist. Der Katalysator ist im parallel zum Bypass verlaufenden Parallelabschnitt des Abgasrohrs vorgesehen, wobei ein Eingang in diesen Parallelabschnitt mittels einer zweiten Klappe verschließbar ist und wobei in diesem Parallelabschnitt stromab der zweiten Klappe und stromauf des Katalysators eine Lambdasonde angeordnet ist.It is already known an exhaust system for an internal combustion engine from JP-08254145 A, which has an exhaust pipe with at least one catalyst and a parallel to the exhaust pipe bypass, wherein an input into the bypass by means of a first flap can be closed. The catalyst is provided in parallel to the bypass extending parallel portion of the exhaust pipe, wherein an input in this parallel section is closable by means of a second flap and wherein in this parallel section downstream of the second flap and upstream of the catalyst, a lambda probe is arranged.

Es sind Abgasanlagen mit Diagnosesensoren bekannt, die ständig dem Abgas ausgesetzt sind. Durch die harten Umgebungsbedingungen im Abgasrohr erfahren die Diagnosesensoren nach einer bestimmten Zeit einen sogenannten Signaldrift, der die Messgenauigkeit zunehmend verschlechtert. Dies führt zu einer Verkürzung der Lebensdauer der Diagnosesensoren. Die Diagnosesensoren haben teilweise Schutzrohre und/oder Schutzschichten, die den Diagnosesensor vor den schädlichen Umgebungsbedingungen schützen sollen.There are known exhaust systems with diagnostic sensors that are constantly exposed to the exhaust. Due to the harsh ambient conditions in the exhaust pipe, the diagnostic sensors experience a so-called signal drift after a certain time, which increasingly worsens the measuring accuracy. This leads to a shortening of the life of the diagnostic sensors. The diagnostic sensors have partially protective tubes and / or protective layers to protect the diagnostic sensor from the harmful environmental conditions.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Abgasanlage mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass die Lebensdauer des zumindest einen Diagnosesensors verlängert wird und die hohe Messgenauigkeit des Diagnosesensors aufrechterhalten bleibt, indem dieser nur temporär dem heißen Abgas ausgesetzt wird. Dies wird erfindungsgemäß erreicht, indem der Bypassabschnitt stromab des zumindest einen Katalysators vorgesehen und in dem Bypassabschnitt ein Diagnosesensor angeordnet ist, dessen Messwerte nur in vorbestimmten Zeitintervallen für eine in einem Steuergerät ablaufende Abgasdiagnose erforderlich sind. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Abgasanlage möglich.The exhaust system according to the invention with the characterizing features of claim 1 has the advantage that the life of the at least one diagnostic sensor is extended and the high accuracy of the diagnostic sensor is maintained by this is only temporarily exposed to the hot exhaust gas. This is achieved according to the invention in that the bypass section is provided downstream of the at least one catalytic converter and a diagnostic sensor is arranged in the bypass section whose measured values are required only at predetermined time intervals for an exhaust gas diagnosis running in a control device. The measures listed in the dependent claims advantageous refinements and improvements of the main claim exhaust system are possible.

Besonders vorteilhaft ist, wenn der Bypass gebildet durch eine in einer Wandung des Abgasrohrs vorgesehene Ausbuchtung, die über eine Öffnung mit dem Abgasrohr strömungsverbunden ist, wobei mittels des Strömungselementes Abgas in die Ausbuchtung leitbar ist. Auf diese Weise wird eine sehr bauraumsparende Anordnung des Bypasses erreicht.It is particularly advantageous if the bypass formed by a provided in a wall of the exhaust pipe bulge, which is flow-connected via an opening with the exhaust pipe, wherein by means of the flow element exhaust gas in the bulge can be conducted. In this way, a very space-saving arrangement of the bypass is achieved.

Gemäß einer vorteilhaften Ausgestaltung ist das Strömungselement als Klappe oder Schieber ausgeführt und mittels eines Stellglieds verstellbar.According to an advantageous embodiment, the flow element is designed as a flap or slider and adjustable by means of an actuator.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description.

Fig.1 zeigt eine erfindungsgemäße Abgasanlage einer Brennkraftmaschine gemäß einem ersten1 shows an exhaust system according to the invention of an internal combustion engine according to a first

Ausführungsbeispiel,Embodiment,

Fig.2 zeigt eine erfindungsgemäße Abgasanlage einer Brennkraftmaschine gemäß einem zweiten Ausführungsbeispiel und2 shows an exhaust system according to the invention of an internal combustion engine according to a second embodiment and

Fig.3 zeigt eine erfindungsgemäße Abgasanlage einer Brennkraftmaschine gemäß einem dritten3 shows an exhaust system according to the invention of an internal combustion engine according to a third

Ausführungsbeispiel.Embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig.1 zeigt vereinfacht eine erfindungsgemäße Abgasanlage einer Brennkraftmaschine gemäß einem ersten Ausführungsbeispiel.1 shows in simplified form an exhaust system according to the invention of an internal combustion engine according to a first exemplary embodiment.

Die Brennkraftmaschine 1 hat eine Abgasanlage 2, die zumindest einen Abgassensor 3 zur Regelung der Brennkraftmaschine 1, beispielsweise eine Lambdasonde, und zumindest einen Diagnosesensor 4 zur gasselektiven Diagnose der Abgaszusammensetzung, beispielsweise einen Kohlenmonoxid-, Kohlenwasserstoff-, Stickoxid- oder Partikelsensor, aufweist.The internal combustion engine 1 has an exhaust system 2 which has at least one exhaust gas sensor 3 for regulating the internal combustion engine 1, for example a lambda sensor, and at least one diagnostic sensor 4 for gas-selective diagnosis of the exhaust gas composition, for example a carbon monoxide, hydrocarbon, nitrogen oxide or particle sensor.

Der Abgassensor 3 und der Diagnosesensor 4 sind jeweils über eine Signalleitung 5 mit einer Motorsteuerung 6 verbunden. Die Diagnose der Abgaszusammensetzung wird von derThe exhaust gas sensor 3 and the diagnostic sensor 4 are each connected via a signal line 5 to a motor controller 6. The diagnosis of the exhaust gas composition is made by the

Motorsteuerung 6 in vorbestimmten Zeitintervallen durchgeführt. Der Diagnosesensor 4 ist beispielsweise nur in diesen Diagnosephasen in Messbereitschaft. Die Abgasanlage 2 hat zumindest ein Abgasrohr 10 und jeweils zumindest einen im Abgasrohr 10 vorgesehenen Katalysator 11. Gemäß dem Ausfuhrungsbeispiel sind zwei Katalysatoren 11 vorgesehen, ein Vorkatalysator 11.1 und ein Nachkatalysator 11.2. Zwischen dem Katalysator 11.1 und dem Katalysator 11.1 könnte ein Partikelfilter angeordnet sein. Der zumindest eine Abgassensor 3 ist beispielsweise stromauf des Vorkatalysators 11.1 angeordnet. Der zumindest eine Diagnosesensor 4 ist in Strömungsrichtung gesehen hinter dem letzten Katalysator 11.2 angeordnet, könnte aber auch zwischen den beiden Katalysatoren 11.1,11.2 vorgesehen sein.Motor controller 6 performed at predetermined time intervals. The diagnostic sensor 4 is ready for measurement only in these diagnostic phases, for example. The exhaust system 2 has at least one exhaust pipe 10 and in each case at least one provided in the exhaust pipe 10 catalyst 11. According to the exemplary embodiment, two catalysts 11 are provided, a pre-catalyst 11.1 and a Nachkatalysator 11.2. Between the catalyst 11.1 and the catalyst 11.1 could be arranged a particulate filter. The at least one exhaust gas sensor 3 is arranged, for example, upstream of the primary catalytic converter 11.1. The at least one diagnostic sensor 4 is arranged downstream of the last catalyst 11.2, as seen in the flow direction, but could also be provided between the two catalytic converters 11.1, 11.2.

Die Abgasanlage 2 weist einen zum Abgasrohr 10 parallel verlaufenden Bypass 12 auf, der über einen Eingang 12.1 und einen Ausgang 12.2 mit dem Abgasrohr 10 strömungsverbunden ist, wobei der Eingang 12.1 in die Bypassleitung 12 mittels eines Strömungselementes 13 verschließbar oder gedrosselt ist. Das Strömungselement 13 ist eine Klappe, ein Schieber oder ein sonstiges Ventil und wird mittels eines Stellglieds 14 verstellt, das beispielsweise ein Magnet ist. Auch der Ausgang 12.2 kann mit einem nicht dargestellten weiteren Strömungselement verschließbar sein. Anstatt des Strömungselementes 13 könnte der Eingang 12.1 auch eine Verengung aufweisen.The exhaust system 2 has a bypass 12 extending in parallel to the exhaust pipe 10, which is flow-connected to the exhaust pipe 10 via an inlet 12.1 and an outlet 12.2, wherein the inlet 12.1 can be closed or throttled into the bypass line 12 by means of a flow element 13. The flow element 13 is a flap, a slider or other valve and is adjusted by means of an actuator 14, which is for example a magnet. Also, the output 12.2 can be closed with a further flow element, not shown. Instead of the flow element 13, the input 12.1 could also have a constriction.

Erfindungsgemäß ist vorgesehen, dass der Bypass 12 stromab des Nachkatalysators 11.2. oder des Vorkatalysators 11.1 vorgesehen und in dem Bypass 12 der zumindest eine Diagnosesensor 4 zur gasselektiven Diagnose der Abgaszusammensetzung angeordnet ist. Der Bypass 12 ist dadurch gebildet, dass das Abgasrohr 10 sich abschnittsweise in zwei Parallelabschnitte 10.1,10.2 verzweigt, die sich stromab wieder zu einem einzigen Abschnitt vereinigen. Einer der Parallelabschnitte 10.1,10.2 ist der Bypass 12. Der Bypass 12 erstreckt sich nur abschnittsweise entlang des Abgasrohrs 10 und hat beispielsweise einen geringeren Strömungsquerschnitt als der andere Parallelabschnitt 10.1,10.2. Der Bypass 12 ist an das Abgasrohr 10 beispielsweise angeschweißt oder angeschraubt. Der Diagnosesensor 4 ragt mit einem Messabschnitt in den Bypass 12 hinein.According to the invention, it is provided that the bypass 12 downstream of the postcatalyst 11.2. or the precatalyst 11.1 provided and in the bypass 12 of the at least one diagnostic sensor 4 is arranged for gas-selective diagnosis of the exhaust gas composition. The bypass 12 is formed in that the exhaust pipe 10 branches in sections into two parallel sections 10.1,10.2, which unite downstream again to form a single section. One of the parallel sections 10.1, 10.2 is the bypass 12. The bypass 12 extends only in sections along the exhaust pipe 10 and, for example, has a smaller flow cross-section than the other parallel section 10.1, 10.2. The bypass 12 is welded or screwed to the exhaust pipe 10, for example. The diagnostic sensor 4 projects into the bypass 12 with a measuring section.

Das Strömungselement 13 wird erfindungsgemäß für eine mit dem Diagnosesensor 4 durchzuführende Diagnose der Abgasanlage 2 zeitweise geöffnet und nach Abschluss der Diagnose wieder geschlossen. Dadurch wird erreicht, dass der Diagnosesensor 4 nur während der Diagnose dem Abgas ausgesetzt und von diesem angeströmt wird. Außerhalb der Diagnosephase wird derAccording to the invention, the flow element 13 is temporarily opened for a diagnosis of the exhaust system 2 to be carried out with the diagnostic sensor 4 and closed again after the diagnosis has been completed. This ensures that the diagnostic sensor 4 is exposed to the exhaust gas only during the diagnosis and is flown by this. Outside the diagnostic phase of the

Diagnosesensor 4 gar nicht oder nur geringfügig von Abgas angeströmt.Diagnostic sensor 4 not or only slightly flowed by exhaust gas.

Alternativ ist möglich, bei vorbestimmten, für die Diagnosesonde „schädlichen" Betriebszuständen des Motors, beispielsweise bei Volllast oder bei Katalysator-Regenerierung, das Strömungselement 13 zu schließen und damit die Anströmung der Diagnosesonde 4 zu unterbrechen und in allen übrigen Betriebszuständen das Strömungselement 13 geöffnet zu halten. Die Lebensdauer bzw. Einsatzdauer des Diagnosesensors 4 wird auf diese Weise in beiden Fällen deutlich erhöht. Außerdem kann eine hohe Messgenauigkeit über eine längere Betriebsdauer als im Stand der Technik aufrechterhalten werden.Alternatively, it is possible, at predetermined, for the diagnostic probe "detrimental" operating conditions of the engine, for example, at full load or catalyst regeneration to close the flow element 13 and thus interrupt the flow of the diagnostic probe 4 and in all other operating conditions, the flow element 13 to open hold. The life or duration of use of the diagnostic sensor 4 is significantly increased in this way in both cases. In addition, high measurement accuracy can be maintained over a longer period of operation than in the prior art.

Fig.2 zeigt vereinfacht eine erfindungsgemäße Abgasanlage einer Brennkraftmaschine gemäß einem zweiten Ausführungsbeispiel.2 shows in simplified form an exhaust system according to the invention of an internal combustion engine according to a second exemplary embodiment.

Bei der Abgasanlage nach Fig.2 sind die gegenüber der Abgasanlage nach Fig.1 gleichbleibenden oder gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet.In the case of the exhaust system according to FIG. 2, the parts which remain the same or function with respect to the exhaust system according to FIG. 1 are identified by the same reference symbols.

Die Abgasanlage nach Fig.2 unterscheidet sich von dem ersten Ausführungsbeispiel darin, dass die Verzweigung in den Bypass 12 Y- förmig ausgeführt ist.The exhaust system according to FIG. 2 differs from the first exemplary embodiment in that the branching into the bypass 12 is Y-shaped.

Fig.3 zeigt vereinfacht eine erfmdungsgemäße Abgasanlage einer Brennkraftmaschine gemäß einem dritten Ausführungsbeispiel.3 shows a simplified exhaust system according to the invention of an internal combustion engine according to a third embodiment.

Bei der Abgasanlage nach Fig.3 sind die gegenüber der Abgasanlage nach Fig.l und Fig.2 gleichbleibenden oder gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet.In the case of the exhaust system according to FIG. 3, the parts which remain the same or function with respect to the exhaust system according to FIG. 1 and FIG. 2 are identified by the same reference numerals.

Die Abgasanlage nach Fig.3 unterscheidet sich von den Abgasanlagen nach Fig.2 und Fig.3 darin, dass der Bypass 12 gebildet ist durch eine in einer Wandung 10.3 des Abgasrohrs 10 vorgesehene Ausbuchtung 17, die über eine Öffnung 17.1 mit dem Abgasrohr 10 strömungsverbunden ist, wobei mittels des Strömungselementes 13 Abgas in die Ausbuchtung 17 leitbar ist. Die Ausbuchtung 17 stellt strömungstechnisch ein Totwassergebiet dar und ist kammerförmig ausgebildet.The exhaust system according to FIG. 3 differs from the exhaust systems according to FIGS. 2 and 3 in that the bypass 12 is formed by a bulge 17 provided in a wall 10. 3 of the exhaust pipe 10, which is flow-connected to the exhaust pipe 10 via an opening 17 is, by means of the flow element 13 exhaust gas into the bulge 17 is conductive. The bulge 17 fluidly represents a Totwassergebiet and is formed chamber-shaped.

Die Öffnung 17.1 ist mittels des Strömungselements 13 verschließbar, wodurch der Diagnosesensor 4 von dem Abgasrohr 10 strömungsgetrennt wird. Die geöffnete Öffnung 17.1 wird durch das Strömungselement 13 in den Eingang 12.1 und den Ausgang 12.2 des Bypasses 12 aufgeteilt, wobei dieses beispielsweise im Bereich der Öffnung 17.1 angeordnet ist. Auf diese Weise werden mit einem einzigen Strömungselement 13 sowohl der Eingang 12.1 als auch der Ausgang 12.2 geöffnet bzw. geschlossen. Bei geöffneter Öffnung 17.1 ragt das Strömungselement 13 beispielsweise schräg in das Abgasrohr 10 hinein und leitet auf diese Weise einen Teil des Abgases in die Ausbuchtung 17, der in Strömungsrichtung gesehen hinter dem Strömungselement 13 wieder zurück in das Abgasrohr 10 strömt.The opening 17.1 can be closed by means of the flow element 13, whereby the diagnostic sensor 4 is separated from the exhaust pipe 10 flow. The opened opening 17.1 is divided by the flow element 13 into the inlet 12.1 and the outlet 12.2 of the bypass 12, this being arranged, for example, in the region of the opening 17.1. In this way, both the input 12.1 and the output 12.2 are opened or closed with a single flow element 13. When the opening 17.1 is open, the flow element 13 projects, for example, obliquely into the exhaust pipe 10 and in this way directs a portion of the exhaust gas into the bulge 17, which, viewed in the flow direction, flows back into the exhaust pipe 10 behind the flow element 13.

Die Ausbuchtung 17 ist einstückig am Abgasrohr 10 ausgebildet oder als separates Bauteil an das Abgasrohr 10 angesetzt. Der Diagnosesensor 4 ragt mit seinem Messabschnitt in den Bypass 12 hinein. Beispielsweise ist er derart angeordnet, dass er mit seiner Längserstreckung in Richtung des Abgasrohrs 10 verläuft. The bulge 17 is integrally formed on the exhaust pipe 10 or attached to the exhaust pipe 10 as a separate component. The diagnostic sensor 4 protrudes with its measuring section into the bypass 12. For example, it is arranged such that it extends with its longitudinal extent in the direction of the exhaust pipe 10.

Claims

Ansprüche claims 1. Abgasanlage einer Brennkraftmaschine, die ein Abgasrohr mit zumindest einem Katalysator und einen parallel zum Abgasrohr verlaufenden Bypass aufweist, wobei ein Eingang in den Bypass mittels eines Strömungselementes verschließbar ist, dadurch gekennzeichnet, dass der Bypass1. exhaust system of an internal combustion engine having an exhaust pipe with at least one catalyst and a parallel to the exhaust pipe bypass, wherein an input into the bypass by means of a flow element is closable, characterized in that the bypass (12) stromab des zumindest einen Katalysators (11) vorgesehen und in dem Bypass (12) zumindest ein Diagnosesensor (4) zur Bestimmung der Abgaszusammensetzung angeordnet ist.(12) downstream of the at least one catalyst (11) and in the bypass (12) at least one diagnostic sensor (4) is arranged for determining the exhaust gas composition. 2. Abgasanlage nach Anspruch 1, dadurch gekennzeichnet, dass der Diagnosesensor (4) ein Kohlenmonoxid-, Kohlenwasserstoff-, Stickoxid- oder Partikelsensor ist.2. Exhaust system according to claim 1, characterized in that the diagnostic sensor (4) is a carbon monoxide, hydrocarbon, nitrogen oxide or particle sensor. 3. Abgasanlage nach Anspruch 1, dadurch gekennzeichnet, dass der Bypass (12) gebildet ist durch eine in einer Wandung (10.3) des Abgasrohrs (10) vorgesehene Ausbuchtung (17), die über eine Öffnung (17.1) mit dem Abgasrohr (10) strömungsverbunden ist, wobei mittels des Strömungselementes (13) Abgas in die Ausbuchtung (17) leitbar ist.3. Exhaust system according to claim 1, characterized in that the bypass (12) is formed by a in a wall (10.3) of the exhaust pipe (10) provided bulge (17) via an opening (17.1) with the exhaust pipe (10). is connected to the flow, wherein by means of the flow element (13) exhaust gas in the bulge (17) can be conducted. 4. Abgasanlage nach Anspruch 1, dadurch gekennzeichnet, dass das Strömungselement (13) als Klappe oder Schieber ausgeführt ist.4. Exhaust system according to claim 1, characterized in that the flow element (13) is designed as a flap or slide. 5. Abgasanlage nach Anspruch 1, dadurch gekennzeichnet, dass das Strömungselement (13) mittels eines Stellglieds (14) verstellbar ist.5. Exhaust system according to claim 1, characterized in that the flow element (13) by means of an actuator (14) is adjustable. 6. Abgasanlage nach Anspruch 5, dadurch gekennzeichnet, dass die Öffnung (17.1) mittels des Strömungselements (13) verschließbar und in geöffnetem Zustand durch das Strömungselement6. Exhaust system according to claim 5, characterized in that the opening (17.1) by means of the flow element (13) closable and in the open state by the flow element (13) in einen Eingang (12.1) und einen Ausgang (12.2) geteilt ist.(13) is divided into an input (12.1) and an output (12.2). 7. Abgasanlage nach Anspruch 5, dadurch gekennzeichnet, dass das Strömungselement (13) im Bereich der Öffnung (17.1) angeordnet ist.7. Exhaust system according to claim 5, characterized in that the flow element (13) in the region of the opening (17.1) is arranged. 8. Abgasanlage nach Anspruch 5, dadurch gekennzeichnet, dass die Ausbuchtung (17) einstückig am Abgasrohr (10) ausgebildet oder als separates Bauteil ausgeführt ist. 8. Exhaust system according to claim 5, characterized in that the bulge (17) integrally formed on the exhaust pipe (10) or designed as a separate component. 9. Abgasanlage nach Anspruch 5, dadurch gekennzeichnet, dass der Diagnosesensor (4) derart an der Ausbuchtung (17) angeordnet ist, dass er mit seiner Längserstreckung in Richtung des Abgasrohrs (10) verläuft.9. Exhaust system according to claim 5, characterized in that the diagnostic sensor (4) is arranged on the bulge (17) such that it extends with its longitudinal extent in the direction of the exhaust pipe (10). 10. Verfahren zum Betrieb einer Abgasanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Stömungselement (13) für eine mit dem Diagnosesensor (4) durchzuführende Diagnose der Abgasanlage (2) zeitweise geöffnet und nach Abschluss der Diagnose wieder geschlossen wird. 10. A method for operating an exhaust system according to one of the preceding claims, characterized in that the flow element (13) for a to be carried out with the diagnostic sensor (4) diagnosis of the exhaust system (2) is temporarily opened and closed again after completion of the diagnosis.
PCT/EP2008/058834 2007-08-16 2008-07-08 Exhaust system and method for operating the exhaust system Ceased WO2009021783A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102008001257B4 (en) * 2008-04-18 2017-12-14 Robert Bosch Gmbh Device for controlling access to a diagnostic sensor
DE102012021929A1 (en) * 2012-11-09 2014-05-15 Man Truck & Bus Ag Method and device for operating a sensor for determining exhaust gas components, in particular for a motor vehicle
DE102016223723A1 (en) * 2016-11-29 2018-05-30 Bayerische Motoren Werke Aktiengesellschaft Arrangement and method for determining lambda values
DE102021204807B4 (en) 2021-05-11 2023-06-07 Rolls-Royce Solutions GmbH Sensor arrangement, exhaust aftertreatment device, internal combustion engine, vehicle and method for operating an exhaust aftertreatment device
DE102021206429A1 (en) 2021-06-22 2022-12-22 Rolls-Royce Solutions GmbH Exhaust gas routing arrangement and internal combustion engine with such an exhaust gas routing arrangement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050262833A1 (en) * 2004-05-27 2005-12-01 Andrews Eric B System for measuring NOx content of exhaust gas
US7255098B1 (en) * 2006-04-27 2007-08-14 Caterpillar Inc. Engine emissions control system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6283650A (en) * 1985-10-09 1987-04-17 Hitachi Ltd oxygen concentration detector
JPH08254145A (en) * 1995-03-17 1996-10-01 Nissan Motor Co Ltd Exhaust gas purification device for internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050262833A1 (en) * 2004-05-27 2005-12-01 Andrews Eric B System for measuring NOx content of exhaust gas
US7255098B1 (en) * 2006-04-27 2007-08-14 Caterpillar Inc. Engine emissions control system

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