EP1927746B1 - Exhaust control device for an internal combustion engine - Google Patents

Exhaust control device for an internal combustion engine Download PDF

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Publication number
EP1927746B1
EP1927746B1 EP07117531.9A EP07117531A EP1927746B1 EP 1927746 B1 EP1927746 B1 EP 1927746B1 EP 07117531 A EP07117531 A EP 07117531A EP 1927746 B1 EP1927746 B1 EP 1927746B1
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EP
European Patent Office
Prior art keywords
exhaust gas
slide
duct
gas recirculation
internal combustion
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EP07117531.9A
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German (de)
French (fr)
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EP1927746A1 (en
Inventor
Heinrich Dismon
Andreas Köster
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Pierburg GmbH
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Pierburg GmbH
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/61—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to exhaust pressure
    • F02M26/615—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to exhaust pressure the exhaust back pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/71—Multi-way valves
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/14—Exhaust treating devices having provisions not otherwise provided for for modifying or adapting flow area or back-pressure
    • 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
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/104—Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves

Definitions

  • the invention relates to an exhaust gas control device for an internal combustion engine in a low-pressure region of an exhaust system of a turbocharged internal combustion engine with an exhaust passage and an exhaust gas recirculation channel, which branches off from the exhaust passage, wherein an exhaust valve controls an exhaust back pressure in the exhaust passage and an exhaust gas recirculation valve controls an exhaust gas mass flow through the exhaust gas recirculation passage and the exhaust valve and the exhaust gas recirculation valve via a control device mechanically coupled depending on each other can be actuated.
  • Low pressure exhaust gas recirculations are known.
  • Low pressure range means that the diversion to the exhaust gas recirculation in the exhaust gas system is located behind the turbine of an exhaust gas turbocharger.
  • an exhaust gas recirculation line is preferably branched off behind the dreaded particle filter. This means that there is soot-free exhaust gas in this area of the exhaust line.
  • the pressure drop when returning to the compressor of the turbocharger is very low, so that a clear limitation of the possible exhaust gas recirculation quantities would be given.
  • an exhaust flap is placed behind the branch of the exhaust gas recirculation line in order to increase the back pressure and thus the possible exhaust gas recirculation rates.
  • a regulation of the exhaust gas recirculation amount is thus dependent on both the exhaust valve and the exhaust gas recirculation valve.
  • the clutch is designed such that the two flaps are opened or closed in opposite directions, so that when fully open exhaust gas recirculation valve the highest possible back pressure created by the closed exhaust flap and thus the highest possible amount of exhaust gas can be returned to the intake manifold or before the compressor.
  • such an embodiment has the disadvantage that, in particular in phases of high exhaust gas temperatures, ie for example during regeneration of a diesel particulate filter, the exhaust gas recirculation flap arranged in the main flow is exposed to a very high thermal load. This can, for example, lead to a delay of the individual components to one another, so that a complete closure of the exhaust gas recirculation line is only very difficult to implement.
  • the operating forces to be expended by the position of the exhaust gas recirculation valve in the main exhaust gas flow are very high.
  • Out JP 59 119054 A is known an exhaust gas control device with an exhaust valve and designed as a slide exhaust gas recirculation valve.
  • the exhaust flap and the slide are mechanically not coupled with each other, but can be opened and closed independently.
  • a compact design is desirable.
  • an exhaust gas control device with the features of the main claim.
  • the exhaust gas recirculation valve is designed as a slide which is coupled to a shaft on which the exhaust valve is mounted, and the slide is arranged in the exhaust gas recirculation passage, the reliability of such an exhaust gas control device is significantly increased, since such a slide insensitive to thermal loads is, so that even after high thermal load accurate exhaust gas quantity control is guaranteed.
  • the required actuating forces of the adjusting device are significantly reduced.
  • the slide in a form-fitting manner on the end of the exhaust flap shaft facing away from the adjusting device. Due to the substantially vertical branching of the exhaust gas recirculation passage from the exhaust gas passage, it is achieved that, in the case of an opened exhaust gas flap, there is only a slight throttling effect, since the serving as exhaust gas recirculation valve slide is not arranged in the exhaust stream as a flow obstacle. Furthermore, as a result, the thermal load on the slider is significantly reduced, so that in particular in uncontrolled regeneration of the diesel particulate filter impairment of the operability of the exhaust gas recirculation valve is excluded because it is located outside the main exhaust stream and thus thermally decoupled from this.
  • the exhaust passage is formed in a housing having a first perpendicular to the exhaust passage extending bore for the shaft and a second arranged in the flow direction of the exhaust gas before the first passage bore one-sided passage, which serves as a first portion of the exhaust gas recirculation passage, wherein the End of this first section is closed by the slide.
  • a slide housing is connected to the first housing and serves as a cover element for a space located on an outer side of the housing, which is arranged at the level of the passage and the flow direction behind the passage passage, wherein in the slide housing with the Slider coupled end of the shaft and the slide are arranged and on the slider housing, a second portion of the exhaust gas recirculation passage is formed, which adjoins the first portion of the opposite side of the slide to the first portion of the exhaust gas recirculation passage.
  • a sealing element is arranged between the slide and the second section of the exhaust gas recirculation channel.
  • the sealing element is loaded by a spring against an outside of the exhaust gas recirculation channel arranged surface of the slide, so that even with thermal displacement or expansion of one of the components, the tightness is ensured to prevent leaks. Furthermore, in such an embodiment, in particular because of the occurring thermal load can be manufactured with very wide tolerances, so that manufacturing costs can be reduced.
  • the slide has a passage opening for controlling the amount of recirculated exhaust gas, whereby the shape of the opening can be adapted to the following exhaust passage.
  • this passage opening is formed contoured, so that there is the possibility to optimally adapt the exhaust gas recirculation characteristic over the slide contour to the requirements of the respective internal combustion engine, thus releasing a defined small gap, for example, with only small desired Abgas Wegfabmenge, which in particular at small angles of rotation of the slide not too large Volume flow change follows.
  • an exhaust gas guide in the exhaust passage, which is arranged in the flow direction of the exhaust gas at least partially in front of the exhaust valve and the exhaust pipe around at least partially around the exhaust flap in the open state.
  • Such exhaust control devices have a high reliability with respect to the control of the desired amounts of exhaust gas, whereby a long service life is achieved.
  • the required actuating forces are very low compared to known designs by this almost pressure balanced system. Incidentally, this creates a very compactly constructed coupled exhaust gas control device with a low number of components.
  • FIG. 1 consists of a housing 1, in which an exhaust passage 2 is formed, in which an exhaust valve 3, which is mounted on a shaft 4, is arranged.
  • the shaft 4 is mounted in the housing 1 via bearings 5, 6 in a passage bore 7.
  • a first end 8 of the shaft 4 is positively connected to a stub shaft 9, which forms a drive shaft of an adjusting device 10 which is fixed to the housing 1.
  • this is Actuator 10 as an electric actuator with a connector 25, wherein also a pneumatic or hydraulic actuator could be used.
  • the stub shaft 9 is surrounded by a radial shaft sealing ring 11 in the through-bore 7 on this side of the exhaust duct 2.
  • An actuator 12 opposite end 12 of the shaft 4 opens behind the passage bore 7 in a space 13 which is closed by a cover member 14.
  • This cover member 14 is attached to the housing 1 and closes the space 13 largely tight.
  • a coupling member 15 is arranged at the end of the shaft 4 form-fitting, which is made in one piece with a slider 16. Equally, it is also conceivable that coupling member 15 to be firmly connected to the slider 16 after manufacture.
  • the slider 16 serves as an exhaust gas recirculation valve and is disposed in an exhaust gas recirculation passage 17 for controlling a recirculated exhaust gas amount.
  • This exhaust gas recirculation passage 17 leads, for example in a known manner before a compressor of a turbocharger in the low pressure region of a turbocharged internal combustion engine.
  • the exhaust gas recirculation passage 17 branches off from the exhaust gas duct 2 at right angles, for which purpose a second passage 18 is arranged in the housing 1 in the flow direction of the exhaust gas flow, the passage 18 of the housing 1 being in this way the first section 19 of the exhaust gas recirculation passage 17 serves.
  • the passage bore 7 and the second passage 18 of the housing 1 are preferably arranged axially one behind the other here.
  • the slide 16 serving as an exhaust gas recirculation valve now abuts.
  • the slider 16 is loaded in this area by a sealing element 21 via a spring 22 against the first portion 19 of the exhaust gas recirculation passage 7.
  • a second section 23 of the exhaust gas recirculation passage 17 adjoins the sealing element 21, which is made in one piece with the cover element 14 in this preferred embodiment.
  • This cover element 14 thus serves simultaneously as a slide housing 24 and as a second stop for the spring 22nd
  • the sealing element 21 has a radially extending extent, which extends beyond the outer diameter of the second section 23 of the exhaust gas recirculation channel 17, so that the spring element in this region 26 can be applied against the sealing element 21.
  • an axially extending portion 27 of the sealing element 21 is arranged, whose outer diameter substantially corresponds to the inner diameter of the second portion 23 of the exhaust gas recirculation passage 17. If now the sealing element is pressed further by the spring 22 against the slide 16, a possible gap to the fixed second portion 23 of the exhaust gas recirculation passage 17 through this axial portion 27 of the sealing element 21 is closed.
  • the slider 16 is shown in a position in which it releases the entire exhaust gas recirculation passage 17, while the exhaust valve 3 is in a position in which the exhaust passage 2 is closed as much as possible.
  • a contoured passage opening 28 is formed in the slide 16, which in particular in FIG. 2 can be seen.
  • two different contours 29 are shown lying one above the other, of which either one is realized.
  • the opening of the underlying second portion 23 of the exhaust gas recirculation passage 17 is additionally shown, so that upon rotation of the slider 16 in the direction of the arrow to the angle ⁇ initially a relatively narrow portion of the contour 29 projects into the exhaust gas recirculation passage 17.
  • This has the consequence that even low exhaust gas recirculation rates can be measured relatively accurately, since usually otherwise small changes in rotational angle in areas of low coverage have a relatively large change in volume flow result. This is reliably avoided here by the contoured design.
  • connection of the shaft 4 to the coupling member 15 and to the slider 16 is achieved by a positive connection in the form of a corrugation 30 and a corresponding corrugation of the shaft 4 or a hub pressed thereon.
  • Other forms of connection are of course also conceivable.
  • an exhaust gas guide element 31 is arranged in the exhaust gas channel 2. Parts of this exhaust gas guide 31 are also in FIG. 1 seen.
  • the shape of this Abgasleitiatas 31 is selected so that the exhaust valve 3 is in the channel 2 releasing state with the exhaust gas flow directed front wing 33 in a pocket 32 of the Abgasleitiatas 31.
  • In the inflow region 34 of this Abgasleitelement 31 is preferably formed approximately wedge-shaped or at least aerodynamically favorable, so that the hot exhaust gas is as possible subjected to small flow obstacles and thus the pressure loss in the open state remains as low as possible.
  • This Anström Society 34 of Abgasleitides 31 extends substantially annularly half round the exhaust flap 3.
  • this annular Anström Scheme 34 via an approximately semicircular second region 35th and an adjoining web 36 are additionally connected to the housing 1.
  • a one-piece production with the housing 1 of the exhaust duct 2 is conceivable for this area.
  • the adjusting device 10 is now actuated, to increase the return rate of both the exhaust gas recirculation passage 17 is opened by turning the slider 16, and at the same time to increase the back pressure by the coupled operation, the exhaust valve 3 is rotated in a closing the channel 2 state becomes. At the desired lower exhaust gas stirring rate takes place in accordance with a reverse rotation.
  • both the bearings 5, 6 and the sealing elements 11, 21 used can be used even at high thermal stress.
  • ceramic or graphite gaskets are commonly used.
  • Such a device is very reliable even at high thermal stress and has a long service life, the production and assembly to minimize the effort possible are kept simple. It can be generated as far as possible any exhaust gas recirculation characteristics and thermal loads on the functionally relevant components are reduced or compensated.

Description

Die Erfindung betrifft eine Abgassteuereinrichtung für eine Verbrennungskraftmaschine in einem Niederdruckbereich eines Abgassystems einer turboaufgeladenen Verbrennungskraftmaschine mit einem Abgaskanal und einem Abgasrückführkanal, welcher von dem Abgaskanal abzweigt, wobei eine Abgasklappe einen Abgasgegendruck im Abgaskanal steuert und ein Abgasrückführventil einen Abgasmassenstrom durch den Abgasrückführkanal steuert und die Abgasklappe und das Abgasrückführventil über eine Stellvorrichtung mechanisch gekoppelt abhängig voneinander betätigbar sind.The invention relates to an exhaust gas control device for an internal combustion engine in a low-pressure region of an exhaust system of a turbocharged internal combustion engine with an exhaust passage and an exhaust gas recirculation channel, which branches off from the exhaust passage, wherein an exhaust valve controls an exhaust back pressure in the exhaust passage and an exhaust gas recirculation valve controls an exhaust gas mass flow through the exhaust gas recirculation passage and the exhaust valve and the exhaust gas recirculation valve via a control device mechanically coupled depending on each other can be actuated.

Derartige Niederdruckabgasrückführungen sind bekannt. Dabei bedeutet Niederdruckbereich, dass sich die Abzweigung zur Abgasrückführung im Abgasstrang hinter der Turbine eines Abgasturboladers befindet. Bei Dieselfahrzeugen wird eine derartige Abgasrückführleitung bevorzugt hinter dem Dleselpartikelfilter abgezweigt. Dies bedeutet, dass in diesem Bereich des Abgasstranges russfreies Abgas vorliegt. Andererseits wird das Druckgefälle bei Rückführung vor den Verdichter des Turboladers sehr gering, so dass eine deutliche Einschränkung der möglichen Abgasrückführmengen gegeben wäre. Aus diesem Grund wird eine Abgasklappe hinter der Abzweigung der Abgasrückführleitung angeordnet, um den Staudruck und somit die möglichen Abgasrückführraten zu erhöhen. Eine Regelung der Abgasrückführmenge ist somit sowohl von der Abgasklappe als auch vom Abgasrückführventil abhängig.Such low pressure exhaust gas recirculations are known. Low pressure range means that the diversion to the exhaust gas recirculation in the exhaust gas system is located behind the turbine of an exhaust gas turbocharger. In diesel vehicles, such an exhaust gas recirculation line is preferably branched off behind the dreaded particle filter. This means that there is soot-free exhaust gas in this area of the exhaust line. On the other hand, the pressure drop when returning to the compressor of the turbocharger is very low, so that a clear limitation of the possible exhaust gas recirculation quantities would be given. For this reason, an exhaust flap is placed behind the branch of the exhaust gas recirculation line in order to increase the back pressure and thus the possible exhaust gas recirculation rates. A regulation of the exhaust gas recirculation amount is thus dependent on both the exhaust valve and the exhaust gas recirculation valve.

Entsprechend wird in der DE 10 2005 002 266 A1 ein Abgasrückführsystem für eine Verbrennungskraftmaschine beschrieben, bei dem zur Reduzierung der Bauteile und zur Vereinfachung der Ventilsteuerung die Abgasklappe und das Abgasrückführventil über eine gemeinsame Stellvorrichtung betätigt werden. Sowohl die Abgasklappe als auch das als Klappe ausgeführte Abgasrückführventil weisen jeweils eine Betätigungswelle auf, wobei diese beiden Betätigungswellen miteinander gekoppelt sind, so dass bei Drehung einer der beiden Wellen über die Stellvorrichtung eine entsprechende gekoppelte Bewegung der anderen Betätigungswelle folgt. Üblicherweise wird hierzu die Kupplung derart ausgeführt, dass die beiden Klappen gegenläufig geöffnet bzw. geschlossen werden, so dass bei vollständig geöffnetem Abgasrückführventil der höchstmögliche Staudruck durch die geschlossene Abgasklappe entsteht und somit eine möglichst hohe Abgasmenge zum Saugrohr beziehungsweise vor den Verdichter zurückgeführt werden kann.Accordingly, in the DE 10 2005 002 266 A1 an exhaust gas recirculation system for an internal combustion engine described, in which the exhaust flap and the exhaust gas recirculation valve are actuated via a common actuating device to reduce the components and to simplify the valve control. Both the exhaust flap and the exhaust gas recirculation valve designed as a flap each have an actuating shaft, wherein these two actuating shafts are coupled together, so that upon rotation of one of the two shafts on the adjusting device followed by a corresponding coupled movement of the other actuating shaft. Usually, for this purpose, the clutch is designed such that the two flaps are opened or closed in opposite directions, so that when fully open exhaust gas recirculation valve the highest possible back pressure created by the closed exhaust flap and thus the highest possible amount of exhaust gas can be returned to the intake manifold or before the compressor.

Eine derartige Ausführung weist jedoch den Nachteil auf, dass insbesondere in Phasen hoher Abgastemperaturen, also beispielsweise bei Regeneration eines Dieselpartikelfilters, die im Hauptstrom angeordnete Abgasrückführklappe einer sehr hohen thermischen Belastung ausgesetzt ist. Dies kann beispielsweise zu einem Verzug der Einzelbauteile zueinander führen, so dass ein vollständiger Verschluss der Abgasrückführleitung nur noch sehr schwer realisierbar ist. Im Übrigen sind die aufzuwendenden Betätigungskräfte durch die Stellung des Abgasrückführventils im Hauptabgasstrom sehr hoch.However, such an embodiment has the disadvantage that, in particular in phases of high exhaust gas temperatures, ie for example during regeneration of a diesel particulate filter, the exhaust gas recirculation flap arranged in the main flow is exposed to a very high thermal load. This can, for example, lead to a delay of the individual components to one another, so that a complete closure of the exhaust gas recirculation line is only very difficult to implement. Incidentally, the operating forces to be expended by the position of the exhaust gas recirculation valve in the main exhaust gas flow are very high.

Aus JP 59 119054 A ist eine Abgassteuereinrichtung mit einer Abgasklappe und einem als Schieber ausgebildeten Abgasrückführventil bekannt. Die Abgasklappe und der Schieber sind mechanisch nicht mit einander gekoppelt, sondern können unabhängig voneinander geöffnet und geschlossen werden.Out JP 59 119054 A is known an exhaust gas control device with an exhaust valve and designed as a slide exhaust gas recirculation valve. The exhaust flap and the slide are mechanically not coupled with each other, but can be opened and closed independently.

Aus DE 10 2004 055846 A1 und US 5 740 785 ist jeweils eine Abgassteuereinrichtung bekannt, bei der das Abgasrückführventil als Schwenkklappe ausgebildet ist.Out DE 10 2004 055846 A1 and US 5,740,785 In each case, an exhaust gas control device is known in which the exhaust gas recirculation valve is designed as a pivoting flap.

Es ist daher Aufgabe der Erfindung, eine Abgassteuereinrichtung für eine Verbrennungskraftmaschine in einem Niederdruckbereich eines Abgassystems einer turboaufgeladenen Verbrennungskraftmaschine zur Verfügung zu stellen, welche auch bei hohen auftretenden Abgastemperaturen zuverlässig die gewünschten Abgasströme steuert, wobei gleichzeitig die aufzubringende Stellkraft der Stellvorrichtung reduziert werden soll. Hierbei ist eine möglichst kompakte Bauform anzustreben.It is therefore an object of the invention to provide an exhaust gas control device for an internal combustion engine in a low-pressure region of an exhaust system of a turbocharged internal combustion engine, which reliably controls the desired exhaust gas flows even at high exhaust gas temperatures occurring, at the same time the applied force of the actuator is to be reduced. Here, a compact design is desirable.

Diese Aufgabe wird durch eine Abgassteuereinrichtung mit den Merkmalen des Hauptanspruchs gelöst. Dadurch, dass das Abgasrückführventil als Schieber ausgeführt ist, der mit einer Welle, auf der die Abgasklappe befestigt ist, gekoppelt ist, und der Schieber im Abgasrückführkanal angeordnet ist, wird die Zuverlässigkeit einer derartigen Abgassteuereinrichtung deutlich erhöht, da ein derartiger Schieber unempfindlich gegen thermische Belastungen ist, so dass auch nach hoher thermischer Belastung eine genaue Abgasmengensteuerung gewährleistet ist. Zusätzlich werden die benötigten Stellkräfte der Stellvorrichtung deutlich reduziert. Des Weiteren können durch die Anordnung des Schiebers auf der Welle und dessen drehfeste Verbindung mit der Welle, auf der die Abgasklappe befestigtt ist, zusätzliche Kopplungsglieder entfallen und der Aufbau sowie die Montage deutlich vereinfacht werden. So ist es beispielsweise möglich, den Schieber formschlüssig am zur Stellvorrichtung abgewandten Ende der Abgasklappenwelle anzuordnen. Durch die im Wesentlichen senkrechte Abzweigung des Abgasrückführkanals vom Abgaskanal wird erreicht, dass im Fall einer geöffneten Abgasklappe nur eine geringe Drosselwirkung vorliegt, da der als Abgasrückführventil dienende Schieber nicht im Abgasstrom als Strömungshindernis angeordnet ist. Des Weiteren wird hierdurch die thermische Belastung des Schiebers deutlich verringert, so dass insbesondere bei unkontrollierter Regeneration des Dieselpartikelfilters eine Beeinträchtigung der Funktionsfähigkeit des Abgasrückführventils ausgeschlossen ist, da dieses außerhalb des Hauptabgasstroms angeordnet ist und somit thermisch von diesem entkoppelt ist.This object is achieved by an exhaust gas control device with the features of the main claim. Characterized in that the exhaust gas recirculation valve is designed as a slide which is coupled to a shaft on which the exhaust valve is mounted, and the slide is arranged in the exhaust gas recirculation passage, the reliability of such an exhaust gas control device is significantly increased, since such a slide insensitive to thermal loads is, so that even after high thermal load accurate exhaust gas quantity control is guaranteed. In addition, the required actuating forces of the adjusting device are significantly reduced. Furthermore, can be eliminated by the arrangement of the slide on the shaft and its rotationally fixed connection with the shaft on which the exhaust valve is mounted, additional coupling members and the construction and assembly are significantly simplified. For example, it is possible to arrange the slide in a form-fitting manner on the end of the exhaust flap shaft facing away from the adjusting device. Due to the substantially vertical branching of the exhaust gas recirculation passage from the exhaust gas passage, it is achieved that, in the case of an opened exhaust gas flap, there is only a slight throttling effect, since the serving as exhaust gas recirculation valve slide is not arranged in the exhaust stream as a flow obstacle. Furthermore, as a result, the thermal load on the slider is significantly reduced, so that in particular in uncontrolled regeneration of the diesel particulate filter impairment of the operability of the exhaust gas recirculation valve is excluded because it is located outside the main exhaust stream and thus thermally decoupled from this.

In einer besonders kompakten Ausführungsform ist der Abgaskanal in einem Gehäuse ausgebildet, welches eine erste senkrecht zum Abgaskanal verlaufende Durchtrittsbohrung für die Welle und einen zweiten in Strömungsrichtung des Abgases vor der ersten Durchtrittsbohrung angeordneten einseitigen Durchtritt aufweist, der als erster Abschnitt des Abgasrückführkanals dient, wobei das Ende dieses ersten Abschnitts durch den Schieber verschließbar ist.In a particularly compact embodiment of the exhaust passage is formed in a housing having a first perpendicular to the exhaust passage extending bore for the shaft and a second arranged in the flow direction of the exhaust gas before the first passage bore one-sided passage, which serves as a first portion of the exhaust gas recirculation passage, wherein the End of this first section is closed by the slide.

In einer hierzu weiterführenden Ausführung ist ein Schiebergehäuse mit dem ersten Gehäuse verbunden und dient als Deckelelement für einen an einer Außenseite des Gehäuses gelegenen Raum, der in Höhe des Durchtritts und der in Strömungsrichtung hinter dem Durchtritt angeordneten Durchtrittsbohrung angeordnet ist, wobei im Schiebergehäuse ein mit dem Schieber gekoppeltes Ende der Welle und der Schieber angeordnet sind und an dem Schiebergehäuse ein zweiter Abschnitt des Abgasrückführkanals ausgeformt ist, der sich an der zum ersten Abschnitt entgegengesetzten Seite des Schiebers an den ersten Abschnitt des Abgasrückführkanals anschließt. Hierdurch wird die Anzahl der benötigten Bauteile weiter reduziert und es wird eine Möglichkeit geschaffen, ein solches System inline in einen bestehenden Abgasstrang zu integrieren.In a further embodiment, a slide housing is connected to the first housing and serves as a cover element for a space located on an outer side of the housing, which is arranged at the level of the passage and the flow direction behind the passage passage, wherein in the slide housing with the Slider coupled end of the shaft and the slide are arranged and on the slider housing, a second portion of the exhaust gas recirculation passage is formed, which adjoins the first portion of the opposite side of the slide to the first portion of the exhaust gas recirculation passage. As a result, the number of required components is further reduced and it is created a way to integrate such a system inline in an existing exhaust system.

Um Leckagen oder Druckverluste zu verhindern, ist zwischen dem Schieber und dem zweiten Abschnitt des Abgasrückführkanals ein Dichtelement angeordnet.In order to prevent leaks or pressure losses, a sealing element is arranged between the slide and the second section of the exhaust gas recirculation channel.

In einer hierzu weiterführenden Ausführungsform ist das Dichtelement über eine Feder gegen eine außerhalb des Abgasrückführkanals angeordnete Oberfläche des Schiebers belastet, so dass auch bei thermischer Verschiebung oder Ausdehnung einer der Bauteile die Dichtigkeit zur Verhinderung von Leckagen sichergestellt ist. Des Weiteren kann in einer solchen Ausführung insbesondere wegen der auftretenden thermischen Belastung mit sehr weiten Toleranzen gefertigt werden, so dass Herstellkosten gesenkt werden können.In a further embodiment, the sealing element is loaded by a spring against an outside of the exhaust gas recirculation channel arranged surface of the slide, so that even with thermal displacement or expansion of one of the components, the tightness is ensured to prevent leaks. Furthermore, in such an embodiment, in particular because of the occurring thermal load can be manufactured with very wide tolerances, so that manufacturing costs can be reduced.

In einer weiterführenden Ausführungsform weist der Schieber eine Durchgangsöffnung zur Steuerung der zurückgeführten Abgasmenge auf, wodurch die Form der Öffnung an den folgenden Abgaskanal angepasst werden kann.In a further embodiment, the slide has a passage opening for controlling the amount of recirculated exhaust gas, whereby the shape of the opening can be adapted to the following exhaust passage.

Vorzugsweise ist diese Durchgangsöffnung konturiert ausgebildet, so dass die Möglichkeit besteht, die Abgasrückführkennlinie über die Schieberkontur optimal an die Erfordernisse der jeweiligen Brennkraftmaschine anzupassen, also beispielsweise bei nur geringer gewünschten Abgasrückführmenge einen definierten kleinen Spalt freizugeben, wodurch insbesondere bei kleinen Drehwinkeln des Schiebers keine zu große Volumenstromänderung folgt.Preferably, this passage opening is formed contoured, so that there is the possibility to optimally adapt the exhaust gas recirculation characteristic over the slide contour to the requirements of the respective internal combustion engine, thus releasing a defined small gap, for example, with only small desired Abgasrückführmenge, which in particular at small angles of rotation of the slide not too large Volume flow change follows.

Des Weiteren ist es vorteilhaft, im Abgaskanal ein Abgasleitelement anzuordnen, welches in Strömungsrichtung des Abgases zumindest teilweise vor der Abgasklappe angeordnet ist und das Abgas zumindest teilweise um die Abgasklappe im geöffneten Zustand herumleitet. Dies bietet einen zusätzlichen Schutz der Abgasklappe im Fall der Schockregeneration des Dieselpartikelfilters. Die Abgasklappe wird somit auch in normalen Regenerationsphasen ebenso wie die zugehörige Antriebswelle vor zu hoher thermischer Belastung zuverlässig geschützt.Furthermore, it is advantageous to arrange an exhaust gas guide in the exhaust passage, which is arranged in the flow direction of the exhaust gas at least partially in front of the exhaust valve and the exhaust pipe around at least partially around the exhaust flap in the open state. This provides additional protection of the exhaust flap in the event of shock regeneration of the diesel particulate filter. The exhaust flap is thus Even in normal regeneration phases as well as the associated drive shaft reliably protected against excessive thermal stress.

Derartige Abgassteuereinrichtungen weisen eine hohe Zuverlässigkeit bezüglich der Steuerung der gewünschten Abgasmengen auf, wobei eine hohe Lebensdauer erreicht wird. Zusätzlich sind die benötigten Stellkräfte durch dieses nahezu druckausgeglichene System im Vergleich zu bekannten Ausführungen sehr gering. Im Übrigen wird hierdurch eine sehr kompakt aufgebaute gekoppelte Abgassteuereinrichtung mit einer geringen Bauteileanzahl geschaffen.Such exhaust control devices have a high reliability with respect to the control of the desired amounts of exhaust gas, whereby a long service life is achieved. In addition, the required actuating forces are very low compared to known designs by this almost pressure balanced system. Incidentally, this creates a very compactly constructed coupled exhaust gas control device with a low number of components.

Ein Ausführungsbeispiel ist in den Zeichnungen dargestellt und wird nachfolgend beschrieben.

  • Figur 1 zeigt eine Seitenansicht einer erfindungsgemäßen Abgassteuereinrichtung in geschnittener Darstellung.
  • Figur 2 zeigt eine Draufsicht auf einen Schieber der erfindungsgemäßen Abgassteuereinrichtung aus Figur 1.
  • Figur 3 zeigt eine Schnittansicht entlang der Durchströmungsachse des Abgaskanals aus Figur 1.
An embodiment is shown in the drawings and will be described below.
  • FIG. 1 shows a side view of an exhaust gas control device according to the invention in a sectional view.
  • FIG. 2 shows a plan view of a slider of the exhaust gas control device according to the invention FIG. 1 ,
  • FIG. 3 shows a sectional view along the flow axis of the exhaust passage FIG. 1 ,

Die erfindungsgemäße Abgassteuervorrichtung gemäß Figur 1 besteht aus einem Gehäuse 1, in dem ein Abgaskanal 2 ausgebildet ist, in welchem eine Abgasklappe 3, die auf einer Welle 4 befestigt ist, angeordnet ist. Die Welle 4 ist im Gehäuse 1 über Lager 5, 6 in einer Durchtrittsbohrung 7 gelagert.The exhaust gas control device according to the invention FIG. 1 consists of a housing 1, in which an exhaust passage 2 is formed, in which an exhaust valve 3, which is mounted on a shaft 4, is arranged. The shaft 4 is mounted in the housing 1 via bearings 5, 6 in a passage bore 7.

Ein erstes Ende 8 der Welle 4 ist formschlüssig mit einem Wellenstumpf 9 verbunden, der eine Antriebswelle einer Stellvorrichtung 10 bildet, die am Gehäuse 1 befestigt ist. Im vorliegenden Ausführungsbeispiel ist diese Stellvorrichtung 10 als elektrischer Aktuator mit einem Stecker 25 dargestellt, wobei ebenso ein pneumatischer oder hydraulischer Steller verwendet werden könnte. Um einen Leckagestrom des Abgases aus dem Abgaskanal 2 in die Stellvorrichtung zu verhindern, ist der Wellenstumpf 9 von einem Radialwellendichtring 11 in der Durchtrittsbohrung 7 an dieser Seite des Abgaskanals 2 umgeben.A first end 8 of the shaft 4 is positively connected to a stub shaft 9, which forms a drive shaft of an adjusting device 10 which is fixed to the housing 1. In the present embodiment, this is Actuator 10 as an electric actuator with a connector 25, wherein also a pneumatic or hydraulic actuator could be used. In order to prevent a leakage flow of the exhaust gas from the exhaust duct 2 into the adjusting device, the stub shaft 9 is surrounded by a radial shaft sealing ring 11 in the through-bore 7 on this side of the exhaust duct 2.

Ein zur Stellvorrichtung 10 entgegengesetztes Ende 12 der Welle 4 mündet hinter der Durchtrittsbohrung 7 in einem Raum 13, der durch ein Deckelelement 14 verschlossen ist. Dieses Deckelelement 14 ist am Gehäuse 1 befestigt und schließt den Raum 13 weitestgehend dicht ab.An actuator 12 opposite end 12 of the shaft 4 opens behind the passage bore 7 in a space 13 which is closed by a cover member 14. This cover member 14 is attached to the housing 1 and closes the space 13 largely tight.

Im Raum 13 ist am Ende 12 der Welle 4 formschlüssig ein Kupplungsglied 15 angeordnet, welches einstückig mit einem Schieber 16 hergestellt ist. Genauso ist es auch denkbar, dass Kupplungsglied 15 mit dem Schieber 16 nach der Herstellung fest zu verbinden.In the space 13, a coupling member 15 is arranged at the end of the shaft 4 form-fitting, which is made in one piece with a slider 16. Equally, it is also conceivable that coupling member 15 to be firmly connected to the slider 16 after manufacture.

Der Schieber 16 dient als Abgasrückführventil und ist in einem Abgasrückführkanal 17 zur Steuerung einer rückgeführten Abgasmenge angeordnet. Dieser Abgasrückführkanal 17 führt beispielsweise in bekannter Weise vor einen Verdichter eines Turboladers im Niederdruckbereich einer turboaufgeladenen Verbrennungskraftmaschine.The slider 16 serves as an exhaust gas recirculation valve and is disposed in an exhaust gas recirculation passage 17 for controlling a recirculated exhaust gas amount. This exhaust gas recirculation passage 17 leads, for example in a known manner before a compressor of a turbocharger in the low pressure region of a turbocharged internal combustion engine.

Der Abgasrückführkanal 17 zweigt vom Abgaskanal 2 im rechten Winkel ab, wobei hierzu in Strömungsrichtung des Abgasstromes gesehen vor der Durchtrittsbohrung 7 ein zweiter Durchtritt 18 im Gehäuse 1 angeordnet ist, wobei der Durchtritt 18 des Gehäuses 1 auf diese Weise als erster Abschnitt 19 des Abgasrückführkanals 17 dient. Die Durchtrittsbohrung 7 und der zweite Durchtritt 18 des Gehäuses 1 sind hier vorzugsweise axial hintereinander angeordnet.The exhaust gas recirculation passage 17 branches off from the exhaust gas duct 2 at right angles, for which purpose a second passage 18 is arranged in the housing 1 in the flow direction of the exhaust gas flow, the passage 18 of the housing 1 being in this way the first section 19 of the exhaust gas recirculation passage 17 serves. The passage bore 7 and the second passage 18 of the housing 1 are preferably arranged axially one behind the other here.

Gegen ein Ende 20 des ersten Abschnitts 19 des durch das Gehäuse 1 gebildeten Abgasrückführkanals 17 liegt nun der als Abgasrückführventil dienende Schieber 16 an. Der Schieber 16 wird in diesem Bereich durch ein Dichtelement 21 über eine Feder 22 gegen den ersten Abschnitt 19 des Abgasrückführkanals 7 belastet. In Strömungsrichtung des Abgasrückführstromes gesehen schließt sich an das Dichtelement 21 ein zweiter Abschnitt 23 des Abgasrückführkanals 17 an, der in dieser bevorzugten Ausführungsform einstückig mit dem Deckelement 14 hergestellt ist. Dieses Deckelelement 14 dient somit gleichzeitig als Schiebergehäuse 24 und als zweiter Anschlag für die Feder 22.Against one end 20 of the first portion 19 of the exhaust gas recirculation channel 17 formed by the housing 1, the slide 16 serving as an exhaust gas recirculation valve now abuts. The slider 16 is loaded in this area by a sealing element 21 via a spring 22 against the first portion 19 of the exhaust gas recirculation passage 7. As seen in the direction of flow of the exhaust gas recirculation flow, a second section 23 of the exhaust gas recirculation passage 17 adjoins the sealing element 21, which is made in one piece with the cover element 14 in this preferred embodiment. This cover element 14 thus serves simultaneously as a slide housing 24 and as a second stop for the spring 22nd

Um diesen Schieberbereich abzudichten, weist das Dichtelement 21 eine radial verlaufende Ausdehnung auf, die über den Außendurchmesser des zweiten Abschnitts 23 des Abgasrückführkanals 17 hinausreicht, so dass das Federelement in diesem Bereich 26 gegen das Dichtelement 21 angelegt werden kann. Im Innern des Abgasrückführkanals 17 ist ein sich in Axialrichtung erstreckender Abschnitt 27 des Dichtelementes 21 angeordnet, dessen Außendurchmesser im Wesentlichen dem Innendurchmesser des zweiten Abschnitts 23 des Abgasrückführkanals 17 entspricht. Wird nun das Dichtelement weiter durch die Feder 22 gegen den Schieber 16 gedrückt, wird eine eventuelle Lücke zum feststehenden zweiten Abschnitt 23 des Abgasrückführkanals 17 durch diesen axialen Abschnitt 27 des Dichtelementes 21 geschlossen.In order to seal this slide region, the sealing element 21 has a radially extending extent, which extends beyond the outer diameter of the second section 23 of the exhaust gas recirculation channel 17, so that the spring element in this region 26 can be applied against the sealing element 21. In the interior of the exhaust gas recirculation passage 17, an axially extending portion 27 of the sealing element 21 is arranged, whose outer diameter substantially corresponds to the inner diameter of the second portion 23 of the exhaust gas recirculation passage 17. If now the sealing element is pressed further by the spring 22 against the slide 16, a possible gap to the fixed second portion 23 of the exhaust gas recirculation passage 17 through this axial portion 27 of the sealing element 21 is closed.

In der vorliegenden Zeichnung ist der Schieber 16 in einer Stellung dargestellt, in der er den gesamten Abgasrückführkanal 17 freigibt, während die Abgasklappe 3 sich in einer Stellung befindet, in der der Abgaskanal 2 möglichst weitgehend verschlossen wird. Zur einfacheren Abgasmengenregulierung in den Abgasrückführkanal 17 ist im Schieber 16 eine konturierte Durchgangsöffnung 28 ausgebildet, welche insbesondere in Figur 2 zu erkennen ist. Hier sind zwei unterschiedliche Konturen 29 übereinander liegend dargestellt, wovon wahlweise eine realisiert wird.In the present drawing, the slider 16 is shown in a position in which it releases the entire exhaust gas recirculation passage 17, while the exhaust valve 3 is in a position in which the exhaust passage 2 is closed as much as possible. For easier regulation of exhaust gas in the exhaust gas recirculation passage 17, a contoured passage opening 28 is formed in the slide 16, which in particular in FIG. 2 can be seen. Here, two different contours 29 are shown lying one above the other, of which either one is realized.

In gestrichelter Darstellung ist zusätzlich die Öffnung des dahinter liegenden zweiten Abschnitts 23 des Abgasrückführkanals 17 dargestellt, so dass bei Drehung des Schiebers 16 in Richtung des Pfeils zum Winkel α zunächst ein relativ enger Bereich der Kontur 29 in den Abgasrückführkanal 17 ragt. Dies hat zur Folge, dass auch geringe Abgasrückführraten relativ genau bemessen werden können, da üblicherweise ansonsten kleine Drehwinkeländerungen in Bereichen geringer Überdeckung eine relativ große Volumenstromänderung zur Folge haben. Dies wird hier durch die konturierte Ausführung zuverlässig vermieden.In dashed representation, the opening of the underlying second portion 23 of the exhaust gas recirculation passage 17 is additionally shown, so that upon rotation of the slider 16 in the direction of the arrow to the angle α initially a relatively narrow portion of the contour 29 projects into the exhaust gas recirculation passage 17. This has the consequence that even low exhaust gas recirculation rates can be measured relatively accurately, since usually otherwise small changes in rotational angle in areas of low coverage have a relatively large change in volume flow result. This is reliably avoided here by the contoured design.

Des Weiteren ist in der Figur 2 zu erkennen, dass die Verbindung der Welle 4 zum Kupplungsglied 15 bzw. zum Schieber 16 durch eine formschlüssige Verbindung in Form einer Riffelung 30 sowie eine korrespondierende Riffelung der Welle 4 oder eine darauf gepressten Nabe erreicht wird. Andere Verbindungsformen sind selbstverständlich ebenso denkbar.Furthermore, in the FIG. 2 to recognize that the connection of the shaft 4 to the coupling member 15 and to the slider 16 is achieved by a positive connection in the form of a corrugation 30 and a corresponding corrugation of the shaft 4 or a hub pressed thereon. Other forms of connection are of course also conceivable.

In Figur 3 ist zu erkennen, dass ein Abgasleitelement 31 im Abgaskanal 2 angeordnet ist. Teile dieses Abgasleitelementes 31 sind auch in Figur 1 ersichtlich. Die Form dieses Abgasleitelementes 31 ist so gewählt, dass die Abgasklappe 3 im den Kanal 2 freigebenden Zustand mit dem zum Abgasstrom gerichteten vorderen Flügel 33 in einer Tasche 32 des Abgasleitelementes 31 liegt. Im Anströmbereich 34 ist dieses Abgasleitelement 31 vorzugsweise etwa keilförmig oder zumindest strömungsgünstig ausgeformt, so dass das heiße Abgas möglichst mit geringen Strömungshindernissen beaufschlagt wird und somit der Druckverlust in geöffnetem Zustand möglichst gering bleibt. Dieser Anströmbereich 34 des Abgasleitelementes 31 verläuft im Wesentlichen ringförmig halbrund um die Abgasklappe 3. Um einen zusätzlichen Halt des Abgasleitelementes 31 zu gewährleisten, kann dieser ringförmige Anströmbereich 34 über einen etwa halbkreisförmigen zweiten Bereich 35 und ein sich daran anschließenden Steg 36 zusätzlich mit dem Gehäuse 1 verbunden werden. Selbstverständlich ist für diesen Bereich auch eine einstückige Herstellung mit dem Gehäuse 1 des Abgaskanals 2 denkbar.In FIG. 3 It can be seen that an exhaust gas guide element 31 is arranged in the exhaust gas channel 2. Parts of this exhaust gas guide 31 are also in FIG. 1 seen. The shape of this Abgasleitelementes 31 is selected so that the exhaust valve 3 is in the channel 2 releasing state with the exhaust gas flow directed front wing 33 in a pocket 32 of the Abgasleitelementes 31. In the inflow region 34 of this Abgasleitelement 31 is preferably formed approximately wedge-shaped or at least aerodynamically favorable, so that the hot exhaust gas is as possible subjected to small flow obstacles and thus the pressure loss in the open state remains as low as possible. This Anströmbereich 34 of Abgasleitelementes 31 extends substantially annularly half round the exhaust flap 3. In order to ensure additional support of the Abgasleitelementes 31, this annular Anströmbereich 34 via an approximately semicircular second region 35th and an adjoining web 36 are additionally connected to the housing 1. Of course, a one-piece production with the housing 1 of the exhaust duct 2 is conceivable for this area.

Je nach gewünschter Rückführmenge wird nun die Stellvorrichtung 10 betätigt, wobei zur Erhöhung der Rückführrate sowohl der Abgasrückführkanal 17 durch Drehen des Schiebers 16 geöffnet wird, als auch gleichzeitig zur Erhöhung des Staudruckes durch die gekoppelte Betätigung die Abgasklappe 3 in einen den Kanal 2 verschließenden Zustand gedreht wird. Bei gewünschter niedrigerer Abgasrührrate findet entsprechend eine Drehung in umgekehrter Richtung statt.Depending on the desired amount of recirculation, the adjusting device 10 is now actuated, to increase the return rate of both the exhaust gas recirculation passage 17 is opened by turning the slider 16, and at the same time to increase the back pressure by the coupled operation, the exhaust valve 3 is rotated in a closing the channel 2 state becomes. At the desired lower exhaust gas stirring rate takes place in accordance with a reverse rotation.

Folgt nun eine unkontrollierte Regeneration des Dieselpartikelfilters in Form einer Schockregeneration, so wird das Ausfallrisiko beziehungsweise die Belastung des Abgasrückführventils als auch der Abgasklappe 3 deutlich reduziert. Dies erfolgt für die Abgasklappe 3 in erster Linie durch das Abgasleitelement 31, welches somit als Abschirmelement dient, als auch durch die Anordnung des Abgasrückführventils beziehungsweise des Schiebers 16 senkrecht zur Hauptströmungsrichtung des Abgasstromes. Durch diese Anordnung findet eine deutliche Entkopplung und somit Entlastung des Schiebers 16 statt. Sollten thermische Ausdehnungen oder sonstige Verschiebungen beispielsweise der Welle 4 oder des Schiebers 16 dennoch folgen, so beeinträchtigt dies nicht die Funktion der Abgassteuereinrichtung, da durch die Anordnung des Schiebers 16 mit dem Dichtelement 21 eine axiale Verschiebung in Richtung der Welle 4 durch diesen Aufbau ausgeglichen werden kann.Now follows an uncontrolled regeneration of the diesel particulate filter in the form of a shock regeneration, the risk of failure or the load of the exhaust gas recirculation valve and the exhaust valve 3 is significantly reduced. This is done for the exhaust valve 3 primarily by the Abgasleitelement 31, which thus serves as a shielding, as well as by the arrangement of the exhaust gas recirculation valve or the slider 16 perpendicular to the main flow direction of the exhaust stream. By this arrangement, a significant decoupling and thus relieving the slide 16 takes place. Should thermal expansions or other displacements, for example, of the shaft 4 or of the slide 16 still follow, this does not impair the function of the exhaust gas control device, since the arrangement of the slide 16 with the sealing element 21 compensates for an axial displacement in the direction of the shaft 4 through this construction can.

Es sollte selbstverständlich sein, dass sowohl die Lager 5, 6 als auch die verwendeten Dichtelemente 11, 21 auch bei hoher thermischer Belastung eingesetzt werden können. Hier werden üblicher Weise beispielsweise Keramik- oder Graphitdichtungen verwendet.It should be understood that both the bearings 5, 6 and the sealing elements 11, 21 used can be used even at high thermal stress. Here, for example, ceramic or graphite gaskets are commonly used.

Des Weiteren sollte deutlich sein, dass die Kopplung des Schiebers 16 an der Welle 4 nicht gezwungenermaßen an der zur Stellvorrichtung 10 entgegengesetzten Seite des Gehäuses 1 stattfinden muss. Auch andere konstruktive Modifikationen sind denkbar, so beispielsweise eine zweiteilige Ausführung des Schiebergehäuses 24.Furthermore, it should be clear that the coupling of the slide 16 on the shaft 4 is not forced to take place on the opposite side of the housing 1 to the adjusting device 10. Other design modifications are conceivable, such as a two-part embodiment of the valve body 24th

Eine derartige Vorrichtung arbeitet auch bei hoher thermischer Belastung sehr zuverlässig und weist eine hohe Lebensdauer auf, wobei die Fertigung und der Zusammenbau zur Minimierung des Aufwandes möglich einfach gehalten sind. Es können weitestgehend beliebige Abgasrückführkennlinien erzeugt werden und thermische Belastungen der funktionsrelevanten Bauteile verringert beziehungsweise ausgeglichen werden.Such a device is very reliable even at high thermal stress and has a long service life, the production and assembly to minimize the effort possible are kept simple. It can be generated as far as possible any exhaust gas recirculation characteristics and thermal loads on the functionally relevant components are reduced or compensated.

Claims (8)

  1. Exhaust gas control device for an internal combustion engine in a low pressure region of an exhaust gas system of a turbo-charged internal combustion engine having an exhaust gas duct (2) and an exhaust gas recirculation duct (17) branched from the exhaust gas duct (2),
    wherein
    an exhaust gas flap (3) controls an exhaust gas back pressure in the exhaust gas duct (2) and an exhaust gas recirculation valve controls an exhaust gas mass flow through the exhaust gas recirculation duct (17), and
    the exhaust gas flap (3) and the exhaust gas recirculation valve are actuable via an actuator in a mechanically coupled and mutually dependent manner,
    characterized in that
    the exhaust gas recirculation valve is designed as a slide (16) coupled to a shaft (4) on which the exhaust gas flap (3) is mounted,
    the slide (16) is connected for rotation with the shaft (4) on which the exhaust gas flap (3) is mounted, and is arranged in the exhaust gas recirculation duct (17),
    the exhaust gas recirculation duct (17) branches substantially perpendicularly from the exhaust gas duct (2).
  2. Exhaust gas control device for internal combustion engines as defined in claim 1, characterized in that the exhaust gas duct (2) is formed in a housing (1) which comprises a first passage bore (7) for the shaft (4), the bore extending perpendicularly to the exhaust gas duct (2), and a second passage (18) at one side of the exhaust gas duct (2) provided upstream of the first passage bore (7) in the flow direction of the exhaust gas, which serves as a first section (19) of the exhaust gas recirculation duct (17), wherein the end (20) of this first section (19) is adapted to be closed by the slide (16).
  3. Exhaust gas control device for an internal combustion engine as defined in claim 2, characterized in that a slide housing (24) is connected with a first housing (1) and serves as a cover element (14) for a space (13) located on an outer side of the housing (1), which space is arranged on the level of the passage (18) and of the passage bore (7) arranged downstream of the passage (18) in the flow direction, wherein an end (12) of the shaft (4) coupled to the slide (16) and the slide (16) are arranged in the slide housing (24), and a second section (23) of the exhaust gas recirculation duct (17) is formed in the slide housing (24), which section adjoins the first section (19) of the exhaust gas recirculation duct (17) on the side of the slide (16) opposite the first section (19).
  4. Exhaust gas control device for an internal combustion engine as defined in claim 3, characterized in that a sealing element (21) is arranged between the slide (16) and the second section (23) of the exhaust gas recirculation duct (17).
  5. Exhaust gas control device for an internal combustion engine as defined in claim 4, characterized in that the sealing element (21) is biased by means of a spring (22) against a surface of the slide (16) situated outside of the exhaust recirculation duct (17).
  6. Exhaust gas control device for an internal combustion engine as defined in one of the preceding claims, characterized in that the slide (16) has a passage opening (28) for controlling the quantity of recirculated exhaust gas.
  7. Exhaust gas control device for an internal combustion engine as defined in claim 6, characterized in that the passage opening (28) is designed as a contour (29).
  8. Exhaust gas control device for an internal combustion engine as defined in one of the preceding claims, characterized in that an exhaust gas guiding element (31) is arranged in the exhaust gas duct (2), which element is provided at least in part upstream of the exhaust gas flap (3) in the flow direction of the exhaust gas and directs the exhaust gas at least in part around the exhaust gas flap (3) in the open state.
EP07117531.9A 2006-11-21 2007-09-28 Exhaust control device for an internal combustion engine Active EP1927746B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006055226A DE102006055226A1 (en) 2006-11-21 2006-11-21 Exhaust gas control device for low-pressure area of exhaust gas system of turbo-charged internal combustion engine, has exhaust gas reconducting valve controlling exhaust gas mass flow through reconducting channel, and designed as slider

Publications (2)

Publication Number Publication Date
EP1927746A1 EP1927746A1 (en) 2008-06-04
EP1927746B1 true EP1927746B1 (en) 2015-03-18

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Application Number Title Priority Date Filing Date
EP07117531.9A Active EP1927746B1 (en) 2006-11-21 2007-09-28 Exhaust control device for an internal combustion engine

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EP (1) EP1927746B1 (en)
DE (1) DE102006055226A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009006013A1 (en) 2009-01-23 2010-08-05 Pierburg Gmbh Exhaust flap device and exhaust heat recovery system of an internal combustion engine
KR101338272B1 (en) * 2013-10-23 2013-12-09 캄텍주식회사 An egr valve for a vechicle
JP7065000B2 (en) * 2018-09-18 2022-05-11 日立Astemo株式会社 Intake device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2232705A1 (en) * 1972-07-04 1974-01-24 Daimler Benz Ag DEVICE FOR THE SUPPLY OF EXHAUST GAS TO THE FUEL-AIR MIXTURE OF A COMBUSTION ENGINE
DE2241935C3 (en) * 1972-08-25 1981-07-16 Robert Bosch Gmbh, 7000 Stuttgart System for exhaust gas decontamination
JPS59119054A (en) 1982-12-24 1984-07-10 Suzuki Motor Co Ltd Egr controller
DE4111240C1 (en) * 1991-04-08 1992-06-04 Fa. Carl Freudenberg, 6940 Weinheim, De
DE4227739C2 (en) * 1992-08-21 1998-04-30 Bayerische Motoren Werke Ag Mixing valve, in particular exhaust gas recirculation valve of an internal combustion engine
US5740785A (en) 1997-06-09 1998-04-21 Southwest Research Institute Two way-high pressure loop, exhaust gas recirculation valve
DE102004055846B4 (en) 2004-11-19 2016-12-15 Bayerische Motoren Werke Aktiengesellschaft Vehicle with turbo diesel engine and exhaust gas recirculation
DE102005002266A1 (en) * 2005-01-18 2006-07-20 Bayerische Motoren Werke Ag Exhaust gas recirculation system for internal combustion engine has two throttle elements which are assigned to common actuator whereby first throttle element is arranged in direction of flow behind exhaust gas return line

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Publication number Publication date
EP1927746A1 (en) 2008-06-04
DE102006055226A1 (en) 2008-05-29

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