DE3821345A1 - Device for reducing exhaust pollutants from an internal combustion engine - Google Patents

Device for reducing exhaust pollutants from an internal combustion engine

Info

Publication number
DE3821345A1
DE3821345A1 DE19883821345 DE3821345A DE3821345A1 DE 3821345 A1 DE3821345 A1 DE 3821345A1 DE 19883821345 DE19883821345 DE 19883821345 DE 3821345 A DE3821345 A DE 3821345A DE 3821345 A1 DE3821345 A1 DE 3821345A1
Authority
DE
Germany
Prior art keywords
catalyst
internal combustion
combustion engine
oxygen probe
probe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19883821345
Other languages
German (de)
Inventor
Hans-Karl Dipl Ing Weining
Rudi Dipl Ing Klein
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Priority to DE19883821345 priority Critical patent/DE3821345A1/en
Publication of DE3821345A1 publication Critical patent/DE3821345A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1474—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method by detecting the commutation time of the sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2390/00—Arrangements for controlling or regulating 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

In its exhaust duct, an internal combustion engine has a catalytic converter and two oxygen sensors. The first sensor is arranged upstream of the converter and the second in the converter. The arrangement of these two sensors makes possible a high control frequency, taking into account the state of the catalytic converter and excluding hydrogen cross-sensitivity. In the catalytic converter arranged downstream of the second sensor, the exhaust gases detected by this sensor but not yet completely converted are converted so that nothing remains.

Description

Die Erfindung betrifft eine Vorrichtung zum Verringern von Abgas-Schadstoffkomponenten einer Brennkraftmaschine gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for reducing Exhaust gas pollutant components according to an internal combustion engine the preamble of claim 1.

Aus der DE-OS 32 24 347 ist eine Vorrichtung zum Verrin­ gern der Abgas-Schadstoffkomponenten einer Brennkraftma­ schine bekannt, die eine erste Sauerstoffsonde stromauf eines im Abgasweg der Brennkraftmaschine angeordneten Katalysators und eine zweite Sauerstoffsonde stromab des Katalysators aufweist. Um eine gute Regelung der Gemisch­ bildung mit einer hohen Regelfrequenz zu erhalten, muß die erste Sauerstoffsonde stromauf des Katalysators möglichst motornah angeordnet sein. Diese Lage der Sonde weist jedoch eine hohe Wasserstoffquerempfindlichkeit auf; das bedeutet, daß im Abgas der Brennkraftmaschine enthaltener freier Wasserstoff die Sondenkennlinie verschiebt und der Brennkraftmaschine ein nach mager verschobenes Gemisch zugeführt wird, wodurch der NO x -Gehalt im Abgas ansteigt. Um diesen Nachteil zu vermeiden und außerdem den von der ersten Sauerstoffsonde nicht erfaßten Zustand des Kataly­ sators zu berücksichtigen, wird in der DE-OS vorgeschla­ gen, eine zweite Sauerstoffsonde stromab des Katalysators anzuordnen. Diese zweite Sonde weist keine Wasserstoff­ querempfindlichkeit mehr auf, da freier Wasserstoff im Katalysator zuvor oxidiert wird.From DE-OS 32 24 347 a device for reducing the exhaust gas pollutant components of an internal combustion engine is known which has a first oxygen probe upstream of a catalytic converter arranged in the exhaust gas path of the internal combustion engine and a second oxygen probe downstream of the catalytic converter. In order to obtain good control of the mixture formation with a high control frequency, the first oxygen probe must be arranged as close to the engine as possible upstream of the catalyst. However, this position of the probe has a high hydrogen cross sensitivity; This means that free hydrogen contained in the exhaust gas of the internal combustion engine shifts the probe characteristic and the internal combustion engine is fed a mixture which has been shifted to lean, as a result of which the NO x content in the exhaust gas increases. In order to avoid this disadvantage and also to take into account the state of the catalyst not detected by the first oxygen probe, DE-OS proposes to arrange a second oxygen probe downstream of the catalyst. This second probe no longer exhibits hydrogen cross-sensitivity, since free hydrogen is previously oxidized in the catalyst.

Diese Anordnung weist den Nachteil auf, daß die Regelfre­ quenz, die bekanntlich durch die Gaslaufzeit, die Sonden­ erkennzeit, die Änderungszeit im Gemischbildner und den Gasdurchsatz, d.h. die Strömungsgeschwindigkeit, bestimmt wird, infolge der Speicherfähigkeit des Katalysators für diese zweite Sonde zwangsläufig niedrig ist und somit das Emissionsverhalten der Brennkraftmaschine, insbesondere bei großem Katalysatorvolumen, verschlechtert wird.This arrangement has the disadvantage that the Regelfre quenz, which is known for the gas run time, the probes detection time, the change time in the mixture generator and the Gas flow rate, i.e. the flow rate is due to the storage capacity of the catalyst for this second probe is inevitably low and therefore that Emission behavior of the internal combustion engine, in particular with large catalyst volume, is deteriorated.

Aufgabe der Erfindung ist es, eine Vorrichtung der gat­ tungsgemäßen Art so auszubilden, daß bei Vermeidung einer Querempfindlichkeit gegenüber Wasserstoff und unter Berücksichtigung der Speicherfähigkeit des Katalysators eine hohe Regelfrequenz der Vorrichtung gewährleistet ist.The object of the invention is a device of the gat appropriate type so that avoiding a Cross sensitivity to hydrogen and under Consideration of the storage capacity of the catalyst a high control frequency of the device is guaranteed.

Die Aufgabe wird erfindungsgemäß durch das im kennzeich­ nenden Teil des Patentanspruchs 1 angegebene Merkmal gelöst. Eine besondere Ausgestaltung der Erfindung geht aus dem Unteranspruch hervor.The object is achieved by the in the characterizing nenden part of claim 1 specified feature solved. A special embodiment of the invention is possible from the subclaim.

Unter Beibehaltung der bekannten motornahen ersten Sauer­ stoffsonde stromauf des Katalysators ist eine zweite Sauerstoffsonde im Katalysator vorgesehen. Durch die Anordnung dieser zweiten Sauerstoffsonde im Katalysator kann einerseits der Zustand des Katalysators bei der Gemischbildung berücksichtigt und eine Wasserstoffquer­ empfindlichkeit ausgeschlossen werden; andererseits erlaubt diese Anordnung dennoch eine hohe Regelfrequenz, da die Abgase nicht das gesamte Katalysatorvolumen durch­ strömen müssen, um zur zweiten Sonde zu gelangen und das nachgeschaltete Katalysatorvolumen für eine restlose Umsetzung der Schadstoffe sorgt.While maintaining the well-known first Sauer close to the engine material probe upstream of the catalyst is a second  Oxygen probe provided in the catalyst. Through the Arrangement of this second oxygen probe in the catalyst can on the one hand the condition of the catalyst at Considered mixture formation and a hydrogen cross sensitivity can be excluded; on the other hand this arrangement nevertheless allows a high control frequency, since the exhaust gases do not pass through the entire volume of the catalyst have to flow to get to the second probe and that downstream catalyst volume for a complete Implementation of pollutants.

Ein Ausführungsbeispiel der Erfindung sei nachstehend anhand der Zeichnung beschrieben. Es zeigtAn embodiment of the invention is shown below described using the drawing. It shows

Fig. 1 schematisch eine erfindungsgemäße Vorrich­ tung bestehend aus Brennkraftmaschine, Katalysator und zwei Sauerstoffsonden, Fig. 1 shows schematically a Vorrich inventive processing consisting of the internal combustion engine, catalyst and two oxygen probes,

Fig. 2 schematisch eine besondere Ausführungsform des Katalysators. Fig. 2 schematically shows a special embodiment of the catalyst.

Fig. 1 zeigt schematisch eine Brennkraftmaschine 1, an die über ein Abgasleitungssystem 2 ein Katalysator 3 und im Anschluß an diesen ein Schalldämpfer 4 angeschlossen ist. Eine stromauf des Katalysators 3 angeordnete Sauer­ stoffsonde 5 mißt den Sauerstoffgehalt im Abgas vor dem Katalysator 3 und erlaubt durch ihre Anordnung eine hohe Regelfrequenz. Die im Katalysator 3 angeordnete zweite Sauerstoffsonde 6 berücksichtigt den Zustand des Katalysators 3 und weist, da freier Wasserstoff im Kataly­ sator 3 schon oxidiert wurde, eine geringe Wasserstoffquer­ empfindlichkeit auf. Die von den beiden Sauerstoffsonden 5 und 6 abgegebenen Signale werden einer Regeleinrichtung 7 zugeführt, die ein entsprechendes Signal an einen Gemisch­ bildner 8 eines Saugrohrsystems 9 weitergibt. Fig. 1 shows schematically an internal combustion engine 1 to which an exhaust pipe system 2, a catalyst 3, and following this, a muffler 4 is connected. An upstream of the catalyst 3 arranged oxygen probe 5 measures the oxygen content in the exhaust gas upstream of the catalyst 3 and allows a high control frequency due to its arrangement. The catalyst 3 arranged in the second oxygen probe 6 takes into account the state of the catalyst 3 and has, as free hydrogen in Kataly sator 3 was already oxidized, a low hydrogen cross sensitivity. The signals emitted by the two oxygen probes 5 and 6 are fed to a control device 7 , which forwards a corresponding signal to a mixture former 8 of an intake manifold system 9 .

Eine besonders günstige Ausgestaltung der erfindungsge­ mäßen Vorrichtung ist der Fig. 2 zu entnehmen. Der Katalysator 3 besteht hierbei aus zwei voneinander ge­ trennten Elementen, z.B. zwei Monolithblöcken 10 und 11, und die zweite Sauerstoffsonde 6 ist in einem Zwischenraum 12 zwischen den beiden Monolithblöcken 10, 11 angeordnet. Sie kann hierbei ungehindert vom Abgasstrom beaufschlagt werden. Bei einer Aufteilung des Gesamtvolumens des Katalysators 3 in zwei ungleich große Elemente kann die Sauerstoffsonde 6 stromab des kleineren (11) und stromauf des größeren (10) Elementes angeordnet sein, wodurch die bis zur Sonde 6 noch nicht vollständig umgesetzten Abgase im Monolithblock 10 vollständig nachbehandelt werden können.A particularly favorable embodiment of the device according to the invention is shown in FIG. 2. The catalyst 3 here consists of two ge separate elements, for example two monolith blocks 10 and 11 , and the second oxygen probe 6 is arranged in an intermediate space 12 between the two monolith blocks 10 , 11 . It can be acted upon unhindered by the exhaust gas flow. In a breakdown of the total volume of the catalyst 3 into two unequal sized elements the oxygen probe 6 may be downstream of the smaller, thereby to probe 6 is not completely converted exhaust gases fully treated (11) and arranged upstream of the larger (10) element in the monolith block 10 can be.

Claims (2)

1. Vorrichtung zum Verringern von Abgas-Schadstoff-Kompo­ nenten einer Brennkraftmaschine mit einem Katalysator im Abgasweg der Brennkraftmaschine, einer stromauf des Katalysators angeordneten ersten Sauerstoffsonde und einer zweiten Sauerstoffsonde, dadurch gekennzeichnet, daß die zweite Sauerstoffsonde (6) im Katalysator (3) angeordnet ist.1. A device for reducing exhaust-gas pollutant components of an internal combustion engine with a catalyst in the exhaust gas path of the internal combustion engine, a first oxygen probe arranged upstream of the catalyst and a second oxygen probe, characterized in that the second oxygen probe ( 6 ) is arranged in the catalyst ( 3 ) is. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Katalysator (3) aus zwei voneinander getrennten Monolithblöcken (10, 11) besteht und die zweite Sauer­ stoffsonde (6) in einem Zwischenraum (12) zwischen den beiden Monolithblöcken (10, 11) angeordnet ist.2. Device according to claim 1, characterized in that the catalyst ( 3 ) consists of two separate monolith blocks ( 10 , 11 ) and the second oxygen probe ( 6 ) in an intermediate space ( 12 ) between the two monolith blocks ( 10 , 11 ) is arranged.
DE19883821345 1988-06-24 1988-06-24 Device for reducing exhaust pollutants from an internal combustion engine Withdrawn DE3821345A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19883821345 DE3821345A1 (en) 1988-06-24 1988-06-24 Device for reducing exhaust pollutants from an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19883821345 DE3821345A1 (en) 1988-06-24 1988-06-24 Device for reducing exhaust pollutants from an internal combustion engine

Publications (1)

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DE3821345A1 true DE3821345A1 (en) 1989-06-22

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DE19883821345 Withdrawn DE3821345A1 (en) 1988-06-24 1988-06-24 Device for reducing exhaust pollutants from an internal combustion engine

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19502011A1 (en) * 1994-02-15 1995-08-17 Ford Werke Ag Method and device for limiting the internal temperature of a catalyst
DE19808382A1 (en) * 1998-02-27 1999-09-02 Volkswagen Ag Control of a NOx absorber catalytic converter
DE19946044C1 (en) * 1999-09-25 2001-01-25 Daimler Chrysler Ag Exhaust gas purification apparatus used on Otto engines has lambda probe arranged between two three-way catalysts
WO2004063541A1 (en) * 2003-01-09 2004-07-29 Emitec Gesellschaft Für Emissionstechnologie Mbh Method for treating a fluid and honeycomb body
DE102017212307A1 (en) 2017-07-19 2019-01-24 Bayerische Motoren Werke Aktiengesellschaft Exhaust system for an internal combustion engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319606A1 (en) * 1973-04-18 1974-11-14 Volkswagenwerk Ag CATALYST FOR THE CATALYTIC CLEANING OF EXHAUST GASES
GB1480393A (en) * 1973-06-29 1977-07-20 Bosch Gmbh Robert Method for reducing the amount of pollutants in engine exhaust gases
DE3224347A1 (en) * 1982-06-30 1983-08-04 Daimler-Benz Ag, 7000 Stuttgart Device for reducing pollutant components in the exhaust gas of an internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319606A1 (en) * 1973-04-18 1974-11-14 Volkswagenwerk Ag CATALYST FOR THE CATALYTIC CLEANING OF EXHAUST GASES
GB1480393A (en) * 1973-06-29 1977-07-20 Bosch Gmbh Robert Method for reducing the amount of pollutants in engine exhaust gases
DE3224347A1 (en) * 1982-06-30 1983-08-04 Daimler-Benz Ag, 7000 Stuttgart Device for reducing pollutant components in the exhaust gas of an internal combustion engine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19502011A1 (en) * 1994-02-15 1995-08-17 Ford Werke Ag Method and device for limiting the internal temperature of a catalyst
DE19502011C2 (en) * 1994-02-15 1998-07-16 Ford Werke Ag Process for limiting the internal temperature of a catalyst
DE19808382A1 (en) * 1998-02-27 1999-09-02 Volkswagen Ag Control of a NOx absorber catalytic converter
US6408615B1 (en) 1998-02-27 2002-06-25 Volkswagen Ag Method for controlling an NOx accumulating catalytic converter
DE19946044C1 (en) * 1999-09-25 2001-01-25 Daimler Chrysler Ag Exhaust gas purification apparatus used on Otto engines has lambda probe arranged between two three-way catalysts
WO2004063541A1 (en) * 2003-01-09 2004-07-29 Emitec Gesellschaft Für Emissionstechnologie Mbh Method for treating a fluid and honeycomb body
US7448201B2 (en) 2003-01-09 2008-11-11 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Honeycomb body and method for treating a fluid
DE102017212307A1 (en) 2017-07-19 2019-01-24 Bayerische Motoren Werke Aktiengesellschaft Exhaust system for an internal combustion engine
WO2019015845A1 (en) 2017-07-19 2019-01-24 Bayerische Motoren Werke Aktiengesellschaft Exhaust gas system for an internal combustion engine
US11421576B2 (en) 2017-07-19 2022-08-23 Bayerische Motoren Werke Aktiengesellschaft Exhaust gas system for an internal combustion engine

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