EP1715162B1 - Exhaust discharge system for internal combustion engine and gate valve for an exhaust discharge system - Google Patents

Exhaust discharge system for internal combustion engine and gate valve for an exhaust discharge system Download PDF

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Publication number
EP1715162B1
EP1715162B1 EP06003308A EP06003308A EP1715162B1 EP 1715162 B1 EP1715162 B1 EP 1715162B1 EP 06003308 A EP06003308 A EP 06003308A EP 06003308 A EP06003308 A EP 06003308A EP 1715162 B1 EP1715162 B1 EP 1715162B1
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EP
European Patent Office
Prior art keywords
exhaust
shut
flap
line
discharge system
Prior art date
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EP06003308A
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German (de)
French (fr)
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EP1715162A3 (en
EP1715162A2 (en
Inventor
Dietmar Schwarzenthal
Erwin Rutschmann
Thorsten Wieg
Leo Dr. Spiegel
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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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
    • 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
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • 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
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06—Exhaust brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere

Definitions

  • the invention relates to an exhaust gas removal system and a butterfly valve for an exhaust gas removal system of an internal combustion engine according to the features of the preambles of claims 1 and 11.
  • a multi-flow exhaust system in which the exhaust gas mass flow is controllable by a arranged in one of the two exhaust pipe strands flap element.
  • the object of the invention is to ensure with a manageable overhead that caused by leaks of the check valves exhaust leakage flows through the closed exhaust pipe harness to the outside.
  • the exhaust gas discharge system according to the invention contributes to an improvement in the torque behavior of the internal combustion engine.
  • a pressure line which is connected to a vacuum source, is connected downstream of a shut-off valve in the closable exhaust-gas line branch.
  • exhaust gas leakage flow is preferably fed back to the engine via the intake system.
  • a throttle provided in the pressure line ensures that air is not sucked in via the part of the exhaust-gas line branch which continues downstream of the shut-off valve.
  • the flow resistance of the throttle is adjusted so that it ensures a return of the exhaust gases even at a maximum leakage current.
  • two check valves are arranged in the shut-off exhaust pipe line, wherein the pressure line between the two check valves opens into the exhaust pipe line.
  • the second shut-off valve ensures that over the part of the exhaust pipe string downstream of the pressure line no secondary air is sucked from the outside.
  • the pressure line is connected to an air pump.
  • the injected between the two check valves compressed air also prevents that caused by the first check valve exhaust leakage flow exits the exhaust system via this exhaust line to the outside.
  • a fourth embodiment only one check valve is provided in the exhaust pipe line to be shut off; the upstream of the check valve in the exhaust pipe branch opening pressure line is in turn connected to an air pump.
  • the compressed air blown into the exhaust-gas line branch prevents an exhaust-gas leakage flow from reaching the outside via the shut-off exhaust-gas line branch.
  • a fifth and sixth embodiment see Fig. 5 to 8
  • the two check valves used in the second and third embodiments are replaced by a check valve in which a flow guide for a gaseous medium is integrated to seal against the exhaust pipe line.
  • the check valve is preferably designed as a butterfly valve, which has on its end face at least one annular groove which serves as a flow guide for the gaseous medium.
  • a pressure line is connected, which is connected to the annular groove, so that either analogously to the second embodiment (see Fig. 2 ) sucked the exhaust gas leakage current through the connection of the pressure line to the intake system or analogous to the third embodiment (see Fig. 3 )
  • the annular groove is acted upon via a connected to the pressure line air pump with compressed air.
  • an air intake system hereinafter referred to as suction system 4, connected to an engine unit 2, an air intake system, hereinafter referred to as suction system 4, connected.
  • the intake system 4 is connected upstream of a throttle body 6 with a throttle valve 8, through which the engine supplied air mass flow is controllable.
  • an exhaust gas removal system is connected to the engine unit 2, which has a manifold unit 8 and two exhaust pipe strands 10 and 12 adjoining the manifold unit 8.
  • a check valve in the form of a butterfly valve 14 is integrated in the first exhaust pipe line 10 downstream of the manifold unit 8.
  • the second exhaust-gas line section 12 which runs parallel to the first exhaust-gas line section 10, has a catalyst, referred to below as start-up catalyst 16. Both exhaust pipe strands 10, 12 are merged at a point 18; downstream of the point 18, a second catalyst, hereinafter referred to as the main catalyst 20, connects.
  • a pressure line 22 Downstream of the arranged in the first exhaust pipe 10 butterfly valve 14, a pressure line 22 is connected, which is connected at its other end to the suction system 4 and thus to a vacuum source.
  • a throttle 24 In the pressure line 22, a throttle 24 is still provided, whose operation will be explained.
  • the exhaust gas removal system operates in the following manner: During the start phase, in which the engine unit and arranged in the exhaust gas discharge system catalysts 16 and 20 have not yet reached their operating temperature, the shut-off valve 14 is closed via a motor control unit, so that the entire exhaust gas mass flow exclusively through the second exhaust pipe branch 12 is guided. Thus, the smaller in size trained starting catalyst 16 can quickly reach its operating temperature, so that low emissions can be achieved even in the startup phase of the internal combustion engine.
  • the suction system 4 pressure line 22 in which a corresponding negative pressure is formed, an exhaust gas leakage current, the latter due to the not hundred percent tightness of the butterfly valve 14 latter, again fed via the pressure line 22 of the motor unit 2 and the suction system 4 become.
  • the throttle 24 arranged in the pressure line 22 ensures that the negative pressure values are limited, so that no secondary air from outside, i. is sucked in via the open end of the exhaust-gas removal system.
  • the second exemplary embodiment differs in that a second shut-off flap 26 is arranged in the first exhaust-gas line branch 10 downstream of the first shut-off flap 14.
  • the pressure line 22 opens between the two butterfly valves 14, 26 in the first exhaust pipe line 10 a.
  • the first exhaust pipe line 10 is closed by the two shut-off valves 14, 26, so that the entire exhaust gas mass flow is again guided exclusively via the second exhaust pipe line 12.
  • Exhaust gas leakage flow, which has passed the first shut-off valve 14 can in turn be supplied via the pressure line 22 of the motor unit 2 analogously to the first exemplary embodiment.
  • the second shut-off flap 26 ensures that no secondary air is sucked in via the pressure line 22 from the outside via the end of the exhaust-gas removal system.
  • the third embodiment differs from the second embodiment in that an air pump 28 is connected to the pressure line 22.
  • the input side of the air pump 28 connected part of the pressure line 22 is connected upstream of the throttle body 6.
  • compressed air is blown via the pressure line 22 in the lying between the two butterfly valves 14, 26 part of the first exhaust pipe string 10 during start-up operation of the engine - in turn, both shut-off valves 14, 26 are closed. In this case too, it is prevented that an exhaust gas leakage flow via the blocked first exhaust gas line branch 10 leaves the exhaust gas removal system.
  • shut-off flap 14 is provided in the first exhaust-gas line run 10, with the pressure line 22 leading into the first exhaust-gas line run 10 upstream of the shut-off flap 14.
  • compressed air is blown into the first exhaust gas line 10 via the air pump 28. If the shut-off valve 14 is closed during start-up operation, it is also prevented that a part of the exhaust gas mass flow over the first exhaust pipe 10 passes to the outside. The airflow generated by the air pump 28 in this case must be greater than the exhaust gas leakage flow. Furthermore, it must be ensured that in the embodiments according to Fig. 3 and 4 the pressure is designed so that it is higher than the maximum achievable pressure in the exhaust system.
  • FIGS. 7 and 8 The detailed structure of this modified butterfly valve 14 'is in the FIGS. 7 and 8 shown.
  • the butterfly valve 14 ' has a housing 30 in which a disc-shaped valve body 32 is rotatably mounted on a shaft 34 between a closed and open position. How out Fig. 7 can be seen, an annular groove 36 is introduced on the front side of the flap body 32.
  • a line connection 38 is provided for the pressure line 22.
  • the pressure line 22 is connected analogously to the second embodiment of the intake system 4 of the internal combustion engine. During operation of the internal combustion engine and when the shut-off flap 14 'is in the closed position, the exhaust gas leakage flow is sucked off via the annular groove 36 and returned to the engine unit 2.
  • the only difference to the fifth embodiment is that the pressure line is connected to an air pump 28 analogous to the third embodiment.
  • the structural design of the butterfly valve 14 ' is unchanged. During operation of the internal combustion engine and when the shut-off flap 14 'is in the closed position, compressed air is blown into the annular groove 36 and thus an exhaust gas leakage current into the downstream part of the exhaust-gas line 10 is prevented.
  • FIG. 9 different designs for shape or geometry of the annular groove 36 are conceivable.
  • the embodiment according to Fig. 9 have the Outside flanks 32a, 32b of the flap body 32, which laterally delimit the annular groove 36, have different diameters.
  • the smaller diameter (see outer edge 32b) is directed opposite to the exhaust gas stream;
  • a pressure pad can be constructed before the butterfly valve 14 ', so that the sealing function is further improved.
  • the sealing function can also be increased by the fact that two or more annular grooves 36, 37 (see Fig. 10 ) are introduced into the valve body 32.
  • the annular grooves can also be used as a kind of thread or helix 39 (see Fig. 11 ) be formed.
  • FIGS. 12 and 13 the connection of the negative pressure or overpressure connection (line connection 38) to the shut-off flap 14 'according to the fifth and sixth embodiments is shown in greater detail.
  • Fig. 12 shows the butterfly valve 14 'in open and Fig. 13 in closed position. In the open position, the pressure supply bores 40 integrated in the shaft 34 for the annular groove 36 are separated from the two line ports 38, so that no exhaust gas can be pushed back via the annular groove 36; an elaborate seal is eliminated.
  • a puncture 42 is provided at the two shaft ends, which are connected to the pressure supply bores 40, so that the bearing 44 for the shaft 34 is also sealed.
  • Fig. 14 the housing 30 of the butterfly valve 14 'is shown, wherein on the inside of the housing 30, two stops 46 are provided for the butterfly valve 14'. In this way, larger tolerances with regard to the dimensioning of shut-off flap 14 'and housing 30 can be permitted without sacrificing the sealing function.

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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)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)
  • Supercharger (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The system has two exhaust gas line strands, where components such as catalyzer and turbocharger are arranged in the gas line strands. The components are switchably and detachably arranged over check valves. A pressure pipe (22) is connected downstream or upstream of the valves or directly at the check valves. The pressure pipe stops the exhaust gas leakage within the locked gas line strands by the leakage of the check valves.

Description

Die Erfindung betrifft ein Abgasabführungssystem sowie eine Absperrklappe für ein Abgasabführungssystem einer Brennkraftmaschine gemäß den Merkmalen der Oberbegriffe der Patentansprüche 1 und 11.The invention relates to an exhaust gas removal system and a butterfly valve for an exhaust gas removal system of an internal combustion engine according to the features of the preambles of claims 1 and 11.

Aus der DE 196 45 226 A1 ist eine mehrflutige Abgasanlage bekannt, bei der der Abgasmassenstrom durch ein in einer der beiden Abgasleitungsstränge angeordnetes Klappenelement steuerbar ist. Durch die Absperrung eines Abgasleitungsstranges soll beispielsweise während der Startphase der Brennkraftmaschine sichergestellt sein, dass der (Start-) Katalysator in dem nicht abgesperrten Abgasleitungsstrang zur schnellen Aufheizung mit dem gesamten Abgasmassenstrom beaufschlagt wird. Hat die Brennkraftmaschine bzw. haben die (Haupt-) Katalysatoren ihre Arbeitstemperatur erreicht, kann durch eine Ansteuerung bzw. durch Öffnen der Klappenelemente der abgesperrte Abgasleitungsstrang geöffnet werden, so dass der von der Kapazität her kleiner ausgebildete (Start-) Katalysator vor einer möglichen Überhitzung geschützt ist.From the DE 196 45 226 A1 a multi-flow exhaust system is known, in which the exhaust gas mass flow is controllable by a arranged in one of the two exhaust pipe strands flap element. By shutting off an exhaust pipe string, for example, it should be ensured during the starting phase of the internal combustion engine that the (start) catalyst in the unclogged exhaust pipe string is subjected to the entire exhaust gas mass flow for rapid heating. Has the internal combustion engine or have the (main) catalysts reached their working temperature, can be opened by a control or by opening the flap elements of the shut-off exhaust line, so that the capacity of the smaller ago formed (start) catalyst from possible overheating is protected.

Im Zusammenhang mit Brennkraftmaschinen mit einer Abgasturboaufladung ist die so genannte Registeraufladung bekannt. Bei dieser zweistufigen Aufladung wird für ein schnelles Ansprechverhalten zuerst nur ein relativ kleiner Abgasturbolader aktiviert, während der zweite, in einem zweiten Abgasleitungsstrang angeordnete Abgasturbolader durch das Öffnen entsprechender Sperrklappen zeitversetzt aktivierbar ist.In the context of internal combustion engines with an exhaust gas turbocharger, the so-called register charging is known. In this two-stage charging only a relatively small exhaust gas turbocharger is first activated for a quick response, while the second, arranged in a second exhaust pipe line exhaust gas turbocharger is activated by the opening of corresponding barrier valves with a time delay.

Problematisch bei den zuvor genannten mehrflutigen zu- bzw. abschaltbaren Abgasleitungssträngen ist die Tatsache, dass die Sperrventile bzw. Sperrklappen nie hundertprozentig in der Lage sind, den betreffenden Abgasleitungsstrang abzusperren.The problem with the aforementioned Mehrflutigen switched on or disconnectable exhaust pipe strands is the fact that the check valves or shut-off valves are never one hundred percent able to shut off the relevant exhaust pipe string.

Aufgabe der Erfindung ist es, mit einem überschaubaren Mehraufwand sicherzustellen, dass durch Undichtigkeiten der Sperrventile hervorgerufene Abgas-Leckageströme über den abgesperrten Abgasleitungsstrang nach außen gelangen.The object of the invention is to ensure with a manageable overhead that caused by leaks of the check valves exhaust leakage flows through the closed exhaust pipe harness to the outside.

Die Aufgabe wird durch im Anspruch 1 angegebenen Merkmale gelöst.The problem is solved by the features specified in claim 1.

Durch eine im Bereich des Sperrventils angeschlossene Druckleitung wird auf vorteilhafte Art und Weise verhindert, dass ein durch das Sperrventil verursachter Abgas-Leckagestrom den abgesperrten Abgasleitungsstrang nach außen verlässt. Damit kann z.B. bei einem im nicht abgesperrten Abgasleitungsstrang angeordneten Startkatalysator sichergestellt werden, dass der gesamte Abgasmassenstrom für die Startphase der Brennkraftmaschine über den Startkatalysator geleitet wird. Dadurch kann beispielsweise das Emissionsverhalten der Brennkraftmaschine verbessert werden. Wie bereits eingangs erwähnt, sind andere Anwendungsmöglichkeiten denkbar, beispielsweise bei der so genannten ATL- Registeraufladung, bei der in beiden Abgasleitungssträngen ein Abgasturbolader angeordnet ist und für ein schnelles Ansprechverhalten bzw. zur Vermeidung des so genannten "Turbo-Loches" in der Startphase lediglich ein Abgasturbolader mit dem gesamten Abgasmassenstrom beaufschlagt wird. Hier trägt das erfindungsgemäße Abgasabführungssystem zu einer Verbesserung des Drehmomentsverhaltens der Brennkraftmaschine bei.By a connected in the region of the check valve pressure line is prevented in an advantageous manner that an exhaust gas leakage caused by the check valve leaves the closed exhaust pipe line to the outside. Thus, e.g. be ensured at a arranged in the unobstructed exhaust pipe line starter catalyst that the entire exhaust gas mass flow is passed for the starting phase of the internal combustion engine via the starting catalyst. As a result, for example, the emission behavior of the internal combustion engine can be improved. As already mentioned, other applications are conceivable, for example in the so-called ATL register charging, in which an exhaust gas turbocharger is arranged in both exhaust pipe strands and for a quick response or to avoid the so-called "turbo-hole" in the start phase only one Exhaust gas turbocharger is charged with the entire exhaust gas mass flow. Here, the exhaust gas discharge system according to the invention contributes to an improvement in the torque behavior of the internal combustion engine.

Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Embodiments of the invention are specified in the subclaims.

In einer ersten Ausführungsform ist in dem absperrbaren Abgasleitungsstrang stromab eines Sperrventils eine Druckleitung angeschlossen, die mit einer Unterdruckquelle verbunden ist. Im Betrieb der Brennkraftmaschine wird der durch Undichtigkeiten des Sperrventils verursachte Abgas-Leckagestrom vorzugsweise über die Sauganlage dem Motor wieder zugeführt.In a first embodiment, a pressure line, which is connected to a vacuum source, is connected downstream of a shut-off valve in the closable exhaust-gas line branch. During operation of the internal combustion engine caused by leaks of the check valve exhaust gas leakage flow is preferably fed back to the engine via the intake system.

Eine in der Druckleitung vorgesehene Drossel stellt dabei sicher, dass nicht Luft über den stromab des Sperrventils weiterführenden Teil des Abgasleitungsstranges angesaugt wird. Der Strömungswiderstand der Drossel ist dabei so abgestimmt, dass sie eine Rückführung der Abgase auch bei einem maximalen Leckagestrom sicherstellt.A throttle provided in the pressure line ensures that air is not sucked in via the part of the exhaust-gas line branch which continues downstream of the shut-off valve. The flow resistance of the throttle is adjusted so that it ensures a return of the exhaust gases even at a maximum leakage current.

In einer zweiten Ausführungsform sind in dem absperrbaren Abgasleitungsstrang zwei Sperrventile angeordnet, wobei die Druckleitung zwischen den beiden Sperrventilen in den Abgasleitungsstrang einmündet. Damit kann der vom ersten Sperrventil hervorgerufene Abgas-Leckagestrom über die Sauganlage der Brennkraftmaschine zugeführt werden. Das zweite Absperrventil stellt dabei sicher, dass über den Teil des Abgasleitungsstranges stromab der Druckleitung keine Nebenluft von außen angesaugt wird.In a second embodiment, two check valves are arranged in the shut-off exhaust pipe line, wherein the pressure line between the two check valves opens into the exhaust pipe line. Thus, the exhaust gas leakage caused by the first check valve can be supplied via the intake system of the internal combustion engine. The second shut-off valve ensures that over the part of the exhaust pipe string downstream of the pressure line no secondary air is sucked from the outside.

In einer dritten vorteilhaften Ausführungsform, bei der wiederum in dem abzusperrenden Abgasleitungsstrang zwei Sperrventile vorgesehen sind, ist die Druckleitung im Gegensatz zur vorhergehenden Ausführungsform an eine Luftpumpe angeschlossen. Die zwischen die beiden Sperrventile eingeblasene Druckluft verhindert ebenfalls, dass ein durch das erste Sperrventil verursachter Abgas-Leckagestrom die Abgasanlage über diesen Abgasleitungsstrang nach außen verlässt.In a third advantageous embodiment, in which two check valves are again provided in the exhaust pipe line to be shut off, in contrast to the previous embodiment, the pressure line is connected to an air pump. The injected between the two check valves compressed air also prevents that caused by the first check valve exhaust leakage flow exits the exhaust system via this exhaust line to the outside.

In einer vierten Ausführungsform ist in dem abzusperrenden Abgasleitungsstrang lediglich ein Sperrventil vorgesehen; die stromauf des Sperrventils in den Abgasleitungsstrang einmündende Druckleitung ist wiederum an eine Luftpumpe angeschlossen. Damit wird analog zum vorhergehenden Ausführungsbeispiel über die in den Abgasleitungsstrang eingeblasene Druckluft verhindert, dass ein Abgas-Leckagestrom über den abgesperrten Abgasleitungsstrang nach außen gelangt.In a fourth embodiment, only one check valve is provided in the exhaust pipe line to be shut off; the upstream of the check valve in the exhaust pipe branch opening pressure line is in turn connected to an air pump. In this way, analogously to the preceding exemplary embodiment, the compressed air blown into the exhaust-gas line branch prevents an exhaust-gas leakage flow from reaching the outside via the shut-off exhaust-gas line branch.

In einer fünften und sechsten Ausführungsform (siehe Fig. 5 bis 8) sind die im zweiten und dritten Ausführungsbeispiel verwendeten zwei Sperrventile durch ein Sperrventil ersetzt, in dem zur Abdichtung gegenüber dem Abgasleitungsstrang eine Strömungsführung für ein gasförmiges Medium integriert ist.In a fifth and sixth embodiment (see Fig. 5 to 8 ), the two check valves used in the second and third embodiments are replaced by a check valve in which a flow guide for a gaseous medium is integrated to seal against the exhaust pipe line.

Das Sperrventil ist vorzugsweise als Absperrklappe ausgebildet, die auf ihrer Stirnseite mindestens eine Ringnut aufweist, die als Strömungsführung für das gasförmige Medium dient. An das Abgasklappengehäuse ist eine Druckleitung angeschlossen, die mit der Ringnut verbunden ist, so dass entweder analog zum zweiten Ausführungsbeispiel (siehe Fig. 2) der Abgas- Leckagestrom durch den Anschluss der Druckleitung an die Sauganlage abgesaugt oder analog zum dritten Ausführungsbeispiel (siehe Fig. 3) die Ringnut über eine an die Druckleitung angeschlossene Luftpumpe mit Druckluft beaufschlagt wird.The check valve is preferably designed as a butterfly valve, which has on its end face at least one annular groove which serves as a flow guide for the gaseous medium. To the exhaust valve housing, a pressure line is connected, which is connected to the annular groove, so that either analogously to the second embodiment (see Fig. 2 ) sucked the exhaust gas leakage current through the connection of the pressure line to the intake system or analogous to the third embodiment (see Fig. 3 ) The annular groove is acted upon via a connected to the pressure line air pump with compressed air.

Nachfolgend wird die Erfindung anhand der einzelnen Ausführungsbeispiele mit Bezug auf die Zeichnung näher erläutert.The invention will be explained in more detail with reference to the individual embodiments with reference to the drawing.

Dabei zeigen:

Fig. 1
eine schematische Darstellung eines Abgasabführungssystems gemäß einer ersten Ausführungsform,
Fig. 2
ein Abgasabführungssystem gemäß einer zweiten Ausführungsform,
Fig. 3
ein Abgasabführungssystem gemäß einer dritten Ausführungsform,
Fig. 4
ein Abgasabführungssystem gemäß einer vierten Ausführungsform,
Fig. 5
ein Abgasabführungssystem gemäß einer fünften Ausführungsform
Fig. 6
ein Abgasabführungssystem gemäß einer sechsten Ausführungsform,
Fig. 7
eine Darstellung einer Absperrklappe für die fünfte und sechste Ausführungsform,
Fig. 8
einen Schnitt durch die Absperrklappe entlang der Linie VIII-VIII in Fig. 7,
Fig. 9 bis 11
weitere Ausführungsformen einer Absperrklappe gemäß der fünften und sechsten Ausführungsform des Abgasabführungssystem,
Fig. 12
eine Darstellung der Absperrklappe in geöffneter Stellung,
Fig. 13
eine Darstellung der Absperrklappe in geschlossener Stellung und
Fig. 14
ein Gehäuse der Absperrklappe mit Anschlägen für die Absperrklappe
Showing:
Fig. 1
a schematic representation of an exhaust discharge system according to a first embodiment,
Fig. 2
an exhaust discharge system according to a second embodiment,
Fig. 3
an exhaust discharge system according to a third embodiment,
Fig. 4
an exhaust discharge system according to a fourth embodiment,
Fig. 5
an exhaust discharge system according to a fifth embodiment
Fig. 6
an exhaust-gas discharge system according to a sixth embodiment,
Fig. 7
a representation of a butterfly valve for the fifth and sixth embodiment,
Fig. 8
a section through the butterfly valve along the line VIII-VIII in Fig. 7 .
Fig. 9 to 11
Further embodiments of a butterfly valve according to the fifth and sixth embodiments of the exhaust system,
Fig. 12
a representation of the butterfly valve in the open position,
Fig. 13
a representation of the butterfly valve in the closed position and
Fig. 14
a housing of the butterfly valve with stops for the butterfly valve

1. Ausführungsbeispiel gemäß Fig. 11st embodiment according to FIG. 1

An eine Motoreinheit 2 ist ein Luftansaugsystem, im folgenden als Sauganlage 4 bezeichnet, angeschlossen. Der Sauganlage 4 vorgeschaltet ist ein Drosselklappengehäuse 6 mit einer Drosselklappe 8, durch die der dem Motor zugeführte Luftmassenstrom steuerbar ist. Abgasseitig ist an die Motoreinheit 2 ein Abgasabführungssystem angeschlossen, das eine Krümmereinheit 8 sowie zwei sich an die Krümmereinheit 8 anschließende Abgasleitungsstränge 10 und 12 aufweist. In dem ersten Abgasleitungsstrang 10 ist stromab der Krümmereinheit 8 ein Sperrventil in Form einer Absperrklappe 14 integriert. Der parallel zum ersten Abgasleitungsstrang 10 verlaufende zweite Abgasleitungsstrang 12 weist einen Katalysator, im folgenden als Startkatalysator 16 bezeichnet, auf. Beide Abgasleitungsstränge 10, 12 sind an einem Punkt 18 zusammengeführt; stromab des Punktes 18 schließt sich ein zweiter Katalysator, im folgenden als Hauptkatalysator 20 bezeichnet, an.To an engine unit 2, an air intake system, hereinafter referred to as suction system 4, connected. The intake system 4 is connected upstream of a throttle body 6 with a throttle valve 8, through which the engine supplied air mass flow is controllable. On the exhaust side, an exhaust gas removal system is connected to the engine unit 2, which has a manifold unit 8 and two exhaust pipe strands 10 and 12 adjoining the manifold unit 8. In the first exhaust pipe line 10 downstream of the manifold unit 8, a check valve in the form of a butterfly valve 14 is integrated. The second exhaust-gas line section 12, which runs parallel to the first exhaust-gas line section 10, has a catalyst, referred to below as start-up catalyst 16. Both exhaust pipe strands 10, 12 are merged at a point 18; downstream of the point 18, a second catalyst, hereinafter referred to as the main catalyst 20, connects.

Stromab der im ersten Abgasleitungsstrang 10 angeordneten Absperrklappe 14 ist eine Druckleitung 22 angeschlossen, die mit ihrem anderen Ende an die Sauganlage 4 und damit an eine Unterdruckquelle angeschlossen ist. In der Druckleitung 22 ist weiterhin eine Drossel 24 vorgesehen, deren Funktionsweise noch erläutert wird.Downstream of the arranged in the first exhaust pipe 10 butterfly valve 14, a pressure line 22 is connected, which is connected at its other end to the suction system 4 and thus to a vacuum source. In the pressure line 22, a throttle 24 is still provided, whose operation will be explained.

Das Abgasabführungssystem funktioniert auf folgende Art und Weise: Während der Startphase, bei der die Motoreinheit und die im Abgasabführungssystem angeordneten Katalysatoren 16 und 20 noch nicht ihre Betriebstemperatur erreicht haben, wird über eine Motorsteuereinheit die Absperrklappe 14 geschlossen, so dass der gesamte Abgasmassenstrom ausschließlich über den zweiten Abgasleitungsstrang 12 geführt ist. Damit kann der in seinem Volumen kleiner ausgebildete Startkatalysator 16 schnell seine Betriebstemperatur erreichen, so dass niedrige Emissionswerte auch in der Startphase der Brennkraftmaschine erreichbar sind. Durch die an die Sauganlage 4 angeschlossene Druckleitung 22, in der ein entsprechender Unterdruck ausgebildet ist, wird ein Abgas-Leckagestrom, der aufgrund der nicht hundertprozentigen Dichtheit der Absperrklappe 14 letztgenannte passiert, wieder über die Druckleitung 22 der Motoreinheit 2 bzw. der Sauganlage 4 zugeführt werden. Die in der Druckleitung 22 angeordnete Drossel 24 stellt sicher, dass die Unterdruckwerte begrenzt sind, so dass keine Nebenluft von außen, d.h. über das offene Ende des Abgasabführungssystems angesaugt wird.The exhaust gas removal system operates in the following manner: During the start phase, in which the engine unit and arranged in the exhaust gas discharge system catalysts 16 and 20 have not yet reached their operating temperature, the shut-off valve 14 is closed via a motor control unit, so that the entire exhaust gas mass flow exclusively through the second exhaust pipe branch 12 is guided. Thus, the smaller in size trained starting catalyst 16 can quickly reach its operating temperature, so that low emissions can be achieved even in the startup phase of the internal combustion engine. By connected to the suction system 4 pressure line 22, in which a corresponding negative pressure is formed, an exhaust gas leakage current, the latter due to the not hundred percent tightness of the butterfly valve 14 latter, again fed via the pressure line 22 of the motor unit 2 and the suction system 4 become. The throttle 24 arranged in the pressure line 22 ensures that the negative pressure values are limited, so that no secondary air from outside, i. is sucked in via the open end of the exhaust-gas removal system.

2. Ausführungsbeispiel gemäß Fig. 22nd embodiment according to FIG. 2

Das zweite Ausführungsbeispiel unterscheidet sich dadurch, dass in dem ersten Abgasleitungsstrang 10 stromab der ersten Absperrklappe 14 eine zweite Absperrklappe 26 angeordnet sind. Die Druckleitung 22 mündet zwischen den beiden Absperrklappen 14, 26 in den ersten Abgasleitungsstrang 10 ein. Während der Startphase ist wiederum der erste Abgasleitungsstrang 10 durch die beiden Absperrklappen 14, 26 geschlossen, so dass der gesamte Abgasmassenstrom wieder ausschließlich über den zweiten Abgasleitungsstrang 12 geführt ist. Abgas-Leckagestrom, der die erste Absperrklappe 14 passiert hat, kann wiederum analog zum ersten Ausführungsbeispiel über die Druckleitung 22 der Motoreinheit 2 zugeführt werden. Die zweite Absperrklappe 26 stellt in diesem Fall sicher, dass von außen über das Ende des Abgasabführungssystem keine Nebenluft über die Druckleitung 22 angesaugt wird.The second exemplary embodiment differs in that a second shut-off flap 26 is arranged in the first exhaust-gas line branch 10 downstream of the first shut-off flap 14. The pressure line 22 opens between the two butterfly valves 14, 26 in the first exhaust pipe line 10 a. During the starting phase, in turn, the first exhaust pipe line 10 is closed by the two shut-off valves 14, 26, so that the entire exhaust gas mass flow is again guided exclusively via the second exhaust pipe line 12. Exhaust gas leakage flow, which has passed the first shut-off valve 14, can in turn be supplied via the pressure line 22 of the motor unit 2 analogously to the first exemplary embodiment. In this case, the second shut-off flap 26 ensures that no secondary air is sucked in via the pressure line 22 from the outside via the end of the exhaust-gas removal system.

3. Ausführungsbeispiel gemäß Fig. 33rd embodiment according to FIG. 3

Das dritte Ausführungsbeispiel unterscheidet sich gegenüber dem zweiten Ausführungsbeispiel dadurch, dass an die Druckleitung 22 eine Luftpumpe 28 angeschlossen ist. Der eingangsseitig an der Luftpumpe 28 angeschlossene Teil der Druckleitung 22 ist dabei stromauf des Drosselklappengehäuses 6 angeschlossen. Im Gegensatz zu den beiden zuvor beschriebenen Ausführungsbeispielen wird beim Startbetrieb des Motors - bei dem wiederum beide Absperrklappen 14, 26 geschlossen sind - Druckluft über die Druckleitung 22 in den zwischen beiden Absperrklappen 14, 26 liegenden Teil des ersten Abgasleitungsstranges 10 geblasen. Auch in diesem Fall wird verhindert, dass ein Abgas-Leckagestrom über den gesperrten ersten Abgasleitungsstrang 10 das Abgasabführungssystem verlässt.The third embodiment differs from the second embodiment in that an air pump 28 is connected to the pressure line 22. The input side of the air pump 28 connected part of the pressure line 22 is connected upstream of the throttle body 6. In contrast to the two embodiments described above, compressed air is blown via the pressure line 22 in the lying between the two butterfly valves 14, 26 part of the first exhaust pipe string 10 during start-up operation of the engine - in turn, both shut-off valves 14, 26 are closed. In this case too, it is prevented that an exhaust gas leakage flow via the blocked first exhaust gas line branch 10 leaves the exhaust gas removal system.

4. Ausführungsbeispiel gemäß Fig. 44th embodiment according to FIG. 4

Bei dem vierten Ausführungsbeispiel ist im ersten Abgasleitungsstrang 10 lediglich eine Absperrklappe 14 vorgesehen, wobei die Druckleitung 22 stromauf der Absperrklappe 14 in den ersten Abgasleitungsstrang 10 einmündet. Analog zum dritten Ausführungsbeispiel wird über die Luftpumpe 28 Druckluft in den ersten Abgasleitungsstrang 10 geblasen. Wenn im Startbetrieb die Absperrklappe 14 geschlossen ist, wird ebenfalls verhindert, dass ein Teil des Abgasmassenstromes über den ersten Abgasleitungsstrang 10 nach außen gelangt. Der durch die Luftpumpe 28 erzeugte Luftstrom muss in diesem Fall größer als der Abgas-Leckagestrom sein. Weiterhin muss sichergestellt werden, dass in den Ausführungsbeispielen gemäß Fig. 3 und 4 der Überdruck so ausgelegt ist, dass er höher als der maximal erreichbare Druck im Abgasabführungssystem ist.In the fourth exemplary embodiment, only one shut-off flap 14 is provided in the first exhaust-gas line run 10, with the pressure line 22 leading into the first exhaust-gas line run 10 upstream of the shut-off flap 14. Analogously to the third embodiment, compressed air is blown into the first exhaust gas line 10 via the air pump 28. If the shut-off valve 14 is closed during start-up operation, it is also prevented that a part of the exhaust gas mass flow over the first exhaust pipe 10 passes to the outside. The airflow generated by the air pump 28 in this case must be greater than the exhaust gas leakage flow. Furthermore, it must be ensured that in the embodiments according to Fig. 3 and 4 the pressure is designed so that it is higher than the maximum achievable pressure in the exhaust system.

5. Ausführungsbeispiel gemäß Fig. 55th embodiment according to FIG. 5

Bei diesem Ausführungsbeispiel ist wiederum im ersten Abgasleitungsstrang 10 nur eine Absperrklappe 14' vorgesehen, wobei die Druckleitung 22 in diesem Fall direkt an die Absperrklappe 14' angeschlossen ist. Der genauere Aufbau dieser modifizierten Absperrklappe 14' ist in den Fig. 7 und 8 dargestellt. Die Absperrklappe 14' weist ein Gehäuse 30 auf, in dem ein scheibenförmiger Klappenkörper 32 auf einer Welle 34 zwischen einer Schliess- und Öffnungsstellung drehbar gelagert ist. Wie aus Fig. 7 ersichtlich, ist auf der Stirnseite des Klappenkörpers 32 eine Ringnut 36 eingebracht. Am Gehäuse 30 der Absperrklappe 14' ist ein Leitungsanschluss 38 für die Druckleitung 22 vorgesehen. Die Druckleitung 22 ist analog zum zweiten Ausführungsbeispiel an die Sauganlage 4 der Brennkraftmaschine angeschlossen. Im Betrieb der Brennkraftmaschine und bei geschlossener Stellung der Absperrklappe 14' wird über die Ringnut 36 der Abgas- Leckagestrom abgesaugt und der Motoreinheit 2 wieder zugeführt.In this embodiment, in turn, only one butterfly valve 14 'is provided in the first exhaust line 10, wherein the pressure line 22 is connected directly to the butterfly valve 14' in this case. The detailed structure of this modified butterfly valve 14 'is in the FIGS. 7 and 8 shown. The butterfly valve 14 'has a housing 30 in which a disc-shaped valve body 32 is rotatably mounted on a shaft 34 between a closed and open position. How out Fig. 7 can be seen, an annular groove 36 is introduced on the front side of the flap body 32. On the housing 30 of the butterfly valve 14 ', a line connection 38 is provided for the pressure line 22. The pressure line 22 is connected analogously to the second embodiment of the intake system 4 of the internal combustion engine. During operation of the internal combustion engine and when the shut-off flap 14 'is in the closed position, the exhaust gas leakage flow is sucked off via the annular groove 36 and returned to the engine unit 2.

6. Ausführungsbeispiel gemäß Fig. 66th embodiment according to FIG. 6

Der einzige Unterschied zum fünften Ausführungsbeispiel besteht darin, dass die Druckleitung analog zum dritten Ausführungsbeispiel an eine Luftpumpe 28 angeschlossen ist. Die konstruktive Ausführung der Absperrklappe 14' ist unverändert. Im Betrieb der Brennkraftmaschine und bei geschlossener Stellung der Absperrklappe 14' wird in die Ringnut 36 Druckluft eingeblasen und somit eine Abgas- Leckagestrom in den stromab liegenden Teil des Abgasleitungsstranges 10 unterbunden.The only difference to the fifth embodiment is that the pressure line is connected to an air pump 28 analogous to the third embodiment. The structural design of the butterfly valve 14 'is unchanged. During operation of the internal combustion engine and when the shut-off flap 14 'is in the closed position, compressed air is blown into the annular groove 36 and thus an exhaust gas leakage current into the downstream part of the exhaust-gas line 10 is prevented.

Wie in den Fig. 9 bis 11 dargestellt, sind unterschiedliche Ausführungen für Form bzw. Geometrie der Ringnut 36 denkbar. Bei der Ausführungsform gemäß Fig. 9 weisen die Außenflanken 32a, 32b des Klappenkörpers 32, die die Ringnut 36 seitlich begrenzen, unterschiedliche Durchmesser auf. Der kleinere Durchmesser (siehe Außenflanke 32b) ist dabei dem Abgasstrom entgegen gerichtet; damit kann bereits vor der Absperrklappe 14' ein Druckpolster aufgebaut werden, so dass die Abdichtfunktion weiter verbessert ist. Alternativ oder ergänzend dazu kann die Abdichtfunktion auch dadurch erhöht werden, dass zwei oder mehrere Ringnuten 36, 37 (siehe Fig. 10) in den Klappenkörper 32 eingebracht sind. Dabei können die Ringnuten auch als eine Art Gewinde oder Wendel 39 (siehe Fig. 11) ausgebildet sein.As in the Fig. 9 to 11 shown, different designs for shape or geometry of the annular groove 36 are conceivable. In the embodiment according to Fig. 9 have the Outside flanks 32a, 32b of the flap body 32, which laterally delimit the annular groove 36, have different diameters. The smaller diameter (see outer edge 32b) is directed opposite to the exhaust gas stream; Thus, a pressure pad can be constructed before the butterfly valve 14 ', so that the sealing function is further improved. Alternatively or additionally, the sealing function can also be increased by the fact that two or more annular grooves 36, 37 (see Fig. 10 ) are introduced into the valve body 32. The annular grooves can also be used as a kind of thread or helix 39 (see Fig. 11 ) be formed.

In den Fig. 12 und 13 ist die Anbindung des Unter- bzw. Überdruckanschlusses (Leitungsanschluss 38) an die Absperrklappe 14' gemäß der fünften und sechsten Ausführungsform genauer dargestellt. Fig. 12 zeigt dabei die Absperrklappe 14' in geöffneter und Fig. 13 in geschlossener Stellung. In der geöffneten Stellung sind die in der Welle 34 integrierten Druckversorgungsbohrungen 40 für die Ringnut 36 von den beiden Leitungsanschlüssen 38 getrennt, so dass kein Abgas über die Ringnut 36 zurückgedrückt werden kann; eine aufwändige Abdichtung entfällt damit. An den beiden Wellenenden ist darüber hinaus jeweils ein Einstich 42 vorgesehen, die mit den Druckversorgungsbohrungen 40 verbunden sind, so dass die Lagerung 44 für die Welle 34 ebenfalls abgedichtet ist. In der in Fig. 13 dargestellten geschlossenen Stellung der Absperrklappe 14' fluchten bzw. korrespondieren die Leitungsanschlüsse 38 mit den Druckversorgungsbohrungen 40, so dass zur Abdichtung der Absperrklappe 14' die Ringnut 36 mit Unter- oder Überdruck beaufschlagbar ist.In the FIGS. 12 and 13 the connection of the negative pressure or overpressure connection (line connection 38) to the shut-off flap 14 'according to the fifth and sixth embodiments is shown in greater detail. Fig. 12 shows the butterfly valve 14 'in open and Fig. 13 in closed position. In the open position, the pressure supply bores 40 integrated in the shaft 34 for the annular groove 36 are separated from the two line ports 38, so that no exhaust gas can be pushed back via the annular groove 36; an elaborate seal is eliminated. In addition, a puncture 42 is provided at the two shaft ends, which are connected to the pressure supply bores 40, so that the bearing 44 for the shaft 34 is also sealed. In the in Fig. 13 illustrated closed position of the butterfly valve 14 'are aligned or correspond to the line connections 38 to the pressure supply holes 40, so that for sealing the butterfly valve 14', the annular groove 36 can be acted upon with negative or positive pressure.

In Fig. 14 ist das Gehäuse 30 der Absperrklappe 14' dargestellt, wobei auf der Innenseite des Gehäuses 30 zwei Anschläge 46 für die Absperrklappe 14' vorgesehen sind. Damit können größere Toleranzen bzgl. der Dimensionierung von Absperrklappe 14' und Gehäuse 30 ohne Einbußen hinsichtlich der Abdichtfunktion zugelassen werden.In Fig. 14 the housing 30 of the butterfly valve 14 'is shown, wherein on the inside of the housing 30, two stops 46 are provided for the butterfly valve 14'. In this way, larger tolerances with regard to the dimensioning of shut-off flap 14 'and housing 30 can be permitted without sacrificing the sealing function.

Natürlich ist es auch denkbar, die in den Fig. 7 bis 13 dargestellte Ausführung der Absperrklappe 14' bei einem Abgasabführungssystem wie in den Fig. 2 und 3 dargestellt, einzusetzen. D.h. man würde die Absperrklappe 14 und 26 durch jeweils eine Absperrklappe 14' - wie in den Fig. 7 bis 13 dargestellt und beschrieben - ersetzen. Durch eine abgeänderte Druckleitung 22, die dann eine Abzweigung zu beiden Absperrklappen 14' aufweist, wäre eine entsprechende Druckbeaufschlagung beider Absperrklappen 14' möglich.Of course it is also conceivable that in the Fig. 7 to 13 illustrated embodiment of the butterfly valve 14 'in a Abgasabführungssystem as in the Fig. 2 and 3 shown to use. That is, one would shut the valve 14 and 26 by one Butterfly valve 14 '- as in the Fig. 7 to 13 illustrated and described - replace. By a modified pressure line 22, which then has a diversion to both shut-off valves 14 ', a corresponding pressurization of the two butterfly valves 14' would be possible.

Claims (16)

  1. Exhaust-gas discharge system for an internal combustion engine, in which the exhaust gas is discharged through at least two exhaust line tracts (10, 12), wherein components such as for example catalytic converters, exhaust-gas turbochargers or the like are arranged in a first exhaust line tract (10, 12), and wherein the first exhaust line tract (10) can be activated and deactivated by means of shut-off valves (14, 26, 14') such that the entire exhaust-gas flow is conducted via the second exhaust tract (12),
    characterized in that
    a pressure source is connected to the exhaust line tract (10) downstream or upstream of the shut-off valve (14) or directly at the shut-off valve (14'), which pressure source prevents the exhaust-gas leakages within the shut-off exhaust line tract (10) which are caused by leaks of the shut-off valve (14, 14', 26).
  2. Exhaust-gas discharge system according to Claim 1, characterized in that, in the exhaust line tract (10) which has been shut off, a pressure line (22) is connected downstream of a shut-off valve (14), which pressure line is connected to a vacuum source.
  3. Exhaust-gas discharge system according to Claim 2, characterized in that a throttle (24) is arranged in the pressure line (22).
  4. Exhaust-gas discharge system according to Claim 1, characterized in that two shut-off valves (14, 26) are provided in the exhaust line tract (10) that can be shut off, wherein a pressure line (22) opens into the exhaust line tract (10) between the two shut-off valves (14, 26).
  5. Exhaust-gas discharge system according to Claim 4, characterized in that the pressure line (22) is connected to a vacuum source of the internal combustion engine.
  6. Exhaust-gas discharge system according to Claim 2 or 5, characterized in that the pressure line (22) is connected to the intake system (4) of the internal combustion engine.
  7. Exhaust system according to Claim 4, characterized in that the pressure line (22) is connected to an air pump (28).
  8. Exhaust-gas discharge system according to Claim 1, characterized in that, in the exhaust line tract (10) which can be shut off, a pressure line (22) is connected upstream of a shut-off valve (14), wherein the pressure line (22) is connected to an air pump (28).
  9. Exhaust-gas discharge system according to Claim 1, characterized in that a flow guide (36) for a gaseous medium is provided on the shut-off valve (14').
  10. Exhaust-gas discharge system according to Claim 9, characterized in that the shut-off valve (14') is designed as a shut-off flap and the flap body (32) is provided, on the end side, with at least one annular groove (36, 37, 39) which can be connected to a pressure line (22).
  11. Shut-off flap for an exhaust-gas discharge system of an internal combustion engine, having a housing (30) and having a disc-shaped flap body (32) which is mounted within the housing (30) so as to be rotatable between a closed position and an open position, characterized in that at least one annular groove (36, 37, 39) is formed on the end side of the flap body (32), which annular groove is provided as a flow guide for a gaseous medium, wherein a pressure source is connected to said shut-off flap (14, 14', 26), which pressure source prevents the exhaust-gas leakages within the shut-off exhaust line tract (10) which are caused by leaks of the shut-off flap (14, 14', 26).
  12. Shut-off flap according to Claim 11, characterized in that the annular grooves (39) are formed in a thread-like or helical manner in the flap body (32).
  13. Shut-off flap according to Claim 11 or 12, characterized in that the outer flanks (32a, 32b) of the flap body (32) have different diameters.
  14. Shut-off flap according to one of Claims 11 to 13, characterized in that at least one line connection (38) for a pressure line (22) is provided on the housing (30).
  15. Shut-off flap according to Claim 14, characterized in that a shaft (34) is provided for mounting the shut-off flap (14'), in which shaft are formed pressure supply bores (40) for the annular groove (36, 37, 39), wherein, in the closed position (figure 13) of the shut-off flap (14'), the pressure supply bores (40) correspond with the openings of the line connections (38).
  16. Shut-off flap according to one of Claims 11 to 15, characterized in that stops (46) for the shut-off flap (14') are provided in the flap housing (30).
EP06003308A 2005-04-19 2006-02-17 Exhaust discharge system for internal combustion engine and gate valve for an exhaust discharge system Active EP1715162B1 (en)

Applications Claiming Priority (1)

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DE102005017863A DE102005017863A1 (en) 2005-04-19 2005-04-19 Exhaust gas discharge system for an internal combustion engine and shut-off valve for an exhaust gas discharge system

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DE102006040876A1 (en) * 2006-08-31 2008-03-06 Bayerische Motoren Werke Ag Exhaust line for an internal combustion engine
DE102007013500A1 (en) 2007-03-21 2008-09-25 Bayerische Motoren Werke Aktiengesellschaft Exhaust line for an internal combustion engine
DE102007049171B4 (en) 2007-10-13 2020-12-17 Bayerische Motoren Werke Aktiengesellschaft Exhaust system for an internal combustion engine with a diagnosable shut-off valve and a diagnosable shut-off valve
DE102008009089B4 (en) 2008-02-14 2021-11-11 Bayerische Motoren Werke Aktiengesellschaft Method and device for determining a leakage mass flow from a shut-off device of a pipe bypassing an exhaust gas cleaning device
DE102009037285A1 (en) 2009-08-12 2011-02-17 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Exhaust system for internal combustion engine, has exhaust pipe, exhaust gas purification unit, another exhaust gas purification unit, bypass line for turning latter exhaust gas purification unit and exhaust gas return line
DE102016113380A1 (en) * 2016-07-20 2018-01-25 Man Diesel & Turbo Se Method for operating an internal combustion engine and internal combustion engine

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US3116725A (en) * 1961-04-20 1964-01-07 Benjamin H Hadley Smog control device and method for internal combustion engines
JP3156470B2 (en) * 1993-11-19 2001-04-16 トヨタ自動車株式会社 Internal combustion engine with exhaust brake
DE19645226A1 (en) * 1996-11-02 1998-05-07 Bayerische Motoren Werke Ag Exhaust system for road vehicle

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