EP1875061B1 - Exhaust gas recirculation device - Google Patents
Exhaust gas recirculation device Download PDFInfo
- Publication number
- EP1875061B1 EP1875061B1 EP06722588A EP06722588A EP1875061B1 EP 1875061 B1 EP1875061 B1 EP 1875061B1 EP 06722588 A EP06722588 A EP 06722588A EP 06722588 A EP06722588 A EP 06722588A EP 1875061 B1 EP1875061 B1 EP 1875061B1
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- EP
- European Patent Office
- Prior art keywords
- exhaust gas
- gas recirculation
- fresh air
- line
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 15
- 230000007423 decrease Effects 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 94
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- 238000000576 coating method Methods 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000009760 functional impairment Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
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- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
- F02M35/10118—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements with variable cross-sections of intake ducts along their length; Venturis; Diffusers
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- 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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
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- 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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
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- 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
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- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
Definitions
- the present invention relates to an exhaust gas recirculation device for an internal combustion engine, in particular in a motor vehicle, having the features of the preamble of claim 1.
- Such an exhaust gas recirculation device which is equipped with an exhaust gas recirculation line for introducing exhaust gas into a fresh air line of the internal combustion engine. Furthermore, an exhaust gas recirculation valve is provided for controlling the exhaust gas recirculation line.
- the exhaust gas recirculation line has an end portion that extends within the fresh air line and has an axially open orifice. The exhaust gas recirculation line thus penetrates an envelope of the fresh air line in order to be able to introduce the recirculated exhaust gases into the fresh air line.
- the exhaust gas recirculation line comprises a tube axially adjustably mounted relative to the fresh air line, which has the outlet opening on the outlet side and an inlet opening on the inlet side, and a feed section which is connected to a connection space in which the inlet opening is also located of the pipe is located.
- the exhaust gas recirculation valve comprises an adjusting device with the aid of which the pipe between an open position, in which the inlet opening is axially spaced from a valve seat, and a closed position is adjustable, in which the tube rests with its inlet opening sealingly on the valve seat.
- the recirculation rate can be adjusted by changing the distance between the valve seat and the inlet opening of the pipe.
- the pipe is exposed to the recirculated exhaust gases in the area of its inlet opening.
- an actuator via which the adjusting device axially drives the pipe, exposed to the recirculated exhaust gases.
- the components of the exhaust gas recirculation device exposed to the exhaust gas can become sooty or gassed. This can lead to a stiffness and in extreme cases to a seizing of the exhaust gas recirculation valve, whereby a proper function of the exhaust gas recirculation device is at risk.
- the exhaust gas recirculation valve also has a arranged in the fresh air pipe sleeve which surrounds the at least one exhaust gas recirculation line in the region of the mouth opening, which is mounted axially adjustable in the fresh air line and which radially inside a nozzle contour with a first decreasing in the flow direction and then increasing Has flow cross-section.
- the exhaust gas recirculation valve is equipped with an adjusting device for axial adjustment of the sleeve relative to the fresh air line.
- the invention is concerned with the problem of providing an improved embodiment for an exhaust gas recirculation device of the type mentioned, which is characterized in particular by the fact that the exhaust gas recirculation rate can be better adjusted.
- the invention is based on the general idea to aerodynamically control the return rate by means of a nozzle.
- the control of the return rate is effected by the axial relative position between the orifice and the nozzle, since the pressure prevailing in the orifice depends on the axial position of the orifice within the nozzle.
- This control principle is combined with the invention in that the end portion having the mouth opening is arranged stationary within the fresh air line, while a sleeve having or forming the nozzle is arranged adjustably in the fresh air line. As a result, the exhaust gas flow reaches unhindered to the mouth opening, without affecting moving parts.
- the sleeve with a Adjustment to adjust without causing the actuator is acted upon by the recirculated exhaust gases.
- This design reduces the risk of sooting or sooting of components of the exhaust gas recirculation device, since contact with the recirculated exhaust gases is largely avoided.
- the introduction of the exhaust gases takes place in the fresh air flow in the region of the nozzle, ie in a range of increased flow velocities.
- higher flow rates reduce the risk of sooting and sooting.
- At least one closure body preferably coaxially with the mouth opening, is arranged on the sleeve and, with the mouth maximally upstream, with the mouth opening for adjusting a minimum opening cross-section of the at least one exhaust gas recirculation line cooperates.
- the return rate can be controlled within limits that can not be controlled aerodynamically, mechanically.
- a return rate with the value zero can be set in the limiting case. That is, the exhaust gas recirculation line can be blocked by the closure body closes the mouth opening.
- the adjusting device by means of which the sleeve can be adjusted axially relative to the fresh air line, be equipped with at least one electromagnetic actuator, which can adjust the sleeve axially by means of electromagnetic forces.
- the actuator omitted moving components, also reduces the risk of sooting or sooting of components of the actuator.
- Fig. 1 to 9 includes an exhaust gas recirculation device 1 according to the invention at least one exhaust gas recirculation line 2 and an exhaust gas recirculation valve 3.
- exhaust gas recirculation is abbreviated below with AGR.
- the exhaust gas recirculation device 1 or the EGR device 1 is used in an internal combustion engine, not shown here, to return a portion of the exhaust gases that arise during operation of the internal combustion engine to the fresh air side of the internal combustion engine.
- motor vehicles are equipped with internal combustion engines, which have an EGR device 1.
- a fresh air line 4 of the internal combustion engine which serves to supply the cylinders or the combustion chambers of the internal combustion engine fresh air.
- a corresponding fresh air flow is indicated by arrows 5.
- the EGR line 2 serves to introduce exhaust gas into the fresh air line 4.
- a corresponding exhaust gas flow is indicated by arrows 6.
- the EGR line 2 has an end section 7 which has an axially open orifice 8, which is expediently open in the flow direction of the fresh air flow 5. Furthermore, the end section 7 extends within the fresh air line 4.
- the EGR line 2 is passed through a shell 9 of the fresh air line 4.
- the fresh air duct 4 may preferably extend in a straight line in the region in which the EGR duct 2 is inserted therein.
- the EGR line 2 can be controlled. That is, the amount of recirculated exhaust gases, that is, the EGR rate can be adjusted by means of the EGR valve 3.
- the EGR valve 3 has a sleeve 10.
- the sleeve 10 is arranged in the interior of the fresh air line 4, in such a way that it encloses the EGR line 2 or its end section 7 in the area of the mouth opening 8.
- the sleeve 10 is provided with a nozzle contour 11 on its inner side facing the mouth opening 8, ie radially inward.
- This nozzle contour 11 is characterized in that it has a flow cross-section which first decreases in the flow direction of the fresh air flow 5 and then increases again.
- an inflow-side axial section of the nozzle contour 11 with the decreasing flow cross-section is axially shorter than an outflow-side axial section with the increasing flow cross-section.
- the inflow-side axial section is approximately half the size of the outflow-side axial section.
- the nozzle contour 11 is designed as a Venturi nozzle, that is, the cross-sectional profile within the nozzle contour 11 is selected so that forms a Venturi nozzle.
- the sleeve 10 is arranged axially adjustable relative to the fresh air line 4 and is preferably mounted axially adjustable for this purpose on the fresh air line 4.
- the EGR valve 3 comprises an adjusting device 12, by means of which the sleeve 10 can be adjusted relative to the fresh air line 4. Due to the adjustability of the sleeve 10, the relative position of the mouth opening 8 can be adjusted within the nozzle contour 11. As the nozzle contour 11 flows through, the pressure prevailing in the fresh air flow 5 changes, with the current pressure value depending on the current position within the nozzle contour 11. Accordingly, the pressure prevailing at the outlet opening 8 pressure can be varied by adjusting the relative position between the mouth opening 8 and sleeve 10. However, the pressure prevailing at the orifice 8 also correlates the amount of recirculated exhaust gases, that is, the EGR rate. Ultimately, therefore, by positioning the sleeve 10 relative to the orifice 8, the EGR rate can be adjusted.
- the EGR valve 3 is also equipped with at least one closure body 13, which is arranged stationary with respect to the sleeve 10.
- This closure body 13 is positioned coaxially with the mouth opening 8. In an adjustment of the sleeve 10 against the fresh air flow 5, the closure body 13 approaches the mouth opening 8 at. At maximum upstream adjusted sleeve 10, the closure body 13 cooperates with the mouth opening 8 for setting a minimum opening cross section of the EGR line 2.
- Fig. 2 shows the embodiment according to Fig. 1 at maximum upstream adjusted sleeve 10.
- the sleeve 10 can be adjusted as far upstream that the closure body 13, the mouth opening 8 closes.
- the EGR line 2 is thereby blocked.
- the closure body 13 is expediently equipped with a flow profile.
- This flow profile can be designed, for example, as a drop profile.
- the closure body 13 in the embodiments shown here on the inflow side on a hemisphere profile and may be provided downstream with a cone profile.
- Essential is that the closure body 13, when it is provided for closing the mouth opening 8, at least on the inflow side complementary to the mouth opening 8 is formed. In the case of a circular orifice 8, therefore, a hemispherical shape is preferred for the inflow side of the closure body 13.
- other forms for the closure body 13 are conceivable, which are also characterized by a low flow resistance.
- closure body 13 and additionally or alternatively the respective orifice opening 8 may be provided with an adhesion-reducing coating.
- a coating for example by means of PTFE or silicone, can reduce an accumulation of dirt particles at the mouth opening 8 or on the closure body 13.
- at least one sealing element can be provided, which is arranged on the closure body 13 and / or on the mouth opening 8.
- the closure body 13 is attached to the sleeve 10.
- the connection between the sleeve 10 and closure body 13 by means of at least one radial web 14.
- three radial webs 14 are provided to secure the closure body 13 to the sleeve 10.
- each only one radial web 14 for connection between closure body 13 and sleeve 10 is provided.
- the adjusting device 12 comprises an actuator 15, by means of which the sleeve 10 can be driven.
- the actuator 15 drives an actuator 16, which is connected to the sleeve 10.
- this actuator 16 is arranged upstream of the mouth opening 8, whereby an actuation of the actuator 16 with exhaust gas can be avoided.
- the actuator 16 is provided at its downstream end with at least one radial web 17 which is connected via an axial web 18 with the sleeve 10. In the embodiments shown in each case three radial webs 17 are provided, which are each connected via an axial web 18 with the sleeve 10.
- the actuator 16 is directly connected to the sleeve 10, which is achieved by a corresponding arrangement of the actuator 16 chosen close to the sleeve 9.
- This embodiment can be realized with a reduced effort and can have a comparatively low flow resistance.
- the actuator 15 is arranged outside the fresh air line 4.
- the actuator 16 penetrates in these embodiments, the shell 9 of the fresh air line 4 sealed.
- the fresh air line 4 is in the region in which the actuator 16 is passed through the sheath 9, curved in order to reduce the effort to realize an axial adjustability of the actuator 16 by means of the actuator 15.
- the actuator 15 is arranged in the interior of the fresh air line 4, namely expedient upstream of the mouth opening 8, in order to avoid a loading of the actuator 15 with exhaust gas here.
- the actuator 15 as here in Fig. 3 be dimensioned so small in terms of its cross-section that it is circumferentially umströmbar from the fresh air flow 5.
- the actuator 15 is attached via radial webs 19 on the shell 9 of the fresh air line 4.
- power supply lines and control lines can be passed through one of the radial webs 19.
- the individual radial webs 19 or 17 or 14 can be aerodynamically profiled in such a way that they have the lowest possible flow resistance.
- the fresh air line 4 in the region of the actuator 15 can also have a correspondingly widened cross section in order to reduce the flow resistance in this area.
- the actuator 15 without actuator 16, since the actuator 15 operates electromagnetically in this embodiment.
- the actuator 15 may be arranged outside the fresh air line 4 here.
- the actuator 15 extends coaxially to the fresh air line 4 in the region of the sleeve 10 and can rest against the envelope 9 in particular on the outside.
- the actuator 15 cooperates in this embodiment with the sleeve 10 without contact via electromagnetic forces, through the shell 9 therethrough.
- the sleeve 10 and the sheath 9 are made of appropriate materials.
- the shell 9 of the fresh air line 4 made of a plastic, while the sleeve 10 is formed by a ferromagnetic material. In this embodiment, there are thus no movable components in addition to the sleeve 10, whereby the risk of sooting or sooting and thus a functional impairment of the EGR valve 3 is reduced.
- the electromagnetically operating actuator 15 also interact with an actuator 16, not shown here, which is connected to the sleeve 10 to drive the sleeve 10 for axial displacement.
- the EGR valve 3 may also be equipped with a return device, which is not shown in the embodiments shown here.
- a return device can be provided for example in the form of a return spring be and be integrated in particular in the actuator 15.
- the restoring device is designed such that it drives the sleeve 10 upstream when the adjusting device 12 has failed or is switched off. With the aid of the restoring device, the sleeve 10 thus assumes a position of minimized EGR rate by itself. If the closure body 13 is provided, this is driven to the position with a minimum opening cross-section or in the closed position.
- the EGR valve 3 can also be equipped with at least one flow-guiding element 20.
- This flow-guiding element 20 is designed such that, with active exhaust gas recirculation, the exhaust gases emerging from the outlet opening 8 at least partially bypass the closure body 13. It is in principle possible to attach such a flow guide 20 as in the illustrated embodiment of the sleeve 10, wherein the flow guide 20 is located within the fresh air line 4 upstream of the closure body 13. It is clear that the attached to the sleeve 10 flow guide 20 is positioned so that it does not collide with the adjustment of the sleeve 10 with the end portion 7. Alternatively, the flow-guiding element 20 could in principle also be fastened to the closure body 13.
- a variant which can be used cumulatively or alternatively in which two flow guide 20 'in the EGR line 2 and in the end portion 7 upstream of the mouth opening 8 are arranged. It is also possible to attach the flow guide 20 at the end portion 7, in such a way that it is then upstream of the mouth opening 8 in the fresh air line 4. It is clear that the attached at the end portion 7 flow guide 20 is positioned so that it does not collide with the adjustment of the sleeve 10 with the closure body 13.
- flow guide elements 20, 20 'shown here are basically exposed to a strong admission of exhaust gas, however, these flow guide elements 20, 20' are not involved in adjusting the EGR rate, so that sooting or sooting of these flow guide elements 20, 20 'has no effect on the operation of the EGR device 1 has.
- the end section 7 may have an inclined course relative to the flow direction of the fresh air flow 5, at least in an end region 21 which has the outlet opening 8.
- the exhaust gas at the outlet opening 8 receives a directional component which passes the exhaust gas at the closure body 13 arranged in alignment with the outlet opening 8.
- the end portion 7 extends at least partially parallel to the fresh air line 4.
- the end portion 7 or at least the mouth opening 8 is arranged concentrically within the fresh air line 4. In principle, however, an eccentric arrangement of the mouth opening 8 is possible.
- EGR line 2 In the embodiments of the Fig. 1 to 6 and 9 in each case only a single EGR line 2 is provided. In some internal combustion engines pulsations may arise on the exhaust side, which may adversely affect the exhaust gas recirculation. In order to prevent such repercussions, it may be expedient to provide more than one EGR line 2, the individual EGR lines 2 being assigned to different cylinders on the exhaust side or to different cylinder groups of the internal combustion engine. Accordingly, the show Fig. 7 and 8th two embodiments of variants of the EGR device 1, each with two EGR lines 2 and 2 'work. With both EGR lines 2, 2 ', the exhaust gases can be introduced into the fresh air line 4 in parallel with active exhaust gas recirculation. The two EGR lines 2, 2 'are expediently assigned to two different cylinders or cylinder groups of the internal combustion engine.
- the EGR valve 3 for controlling the EGR lines 2, 2 ' is provided with two closure bodies 13, 13', which are fastened together to the sleeve 10 and can be positioned together by axially displacing the sleeve 10 relative to the respective orifice 8, 8 ' are.
- the two EGR lines 2, 2 ' integralally formed.
- the two EGR lines 2, 2 ' are arranged coaxially with one another.
- the exhaust gases of the inner EGR pipe 2 'are thereby transported to the inside of the inner EGR pipe 2', while the exhaust gases of the outer EGR pipe 2 are transported in the annulus between the outer EGR pipe 2 and the inner EGR pipe 2 ' ,
- the mouth openings 8, 8 'of the two EGR lines 2, 2' within the fresh air line 4 are arranged concentrically to each other or arranged concentrically with each other.
- the two mouth openings 8, 8 ' can be arranged offset in the axial direction to each other, such that a common closure body 13 is sufficient, the mouth opening 8 of the outer EGR line 2 or simultaneously to close both mouth openings 8, 8 '.
- the EGR device 1 may also be equipped with a fresh air auxiliary line 22.
- This fresh air auxiliary line 22 extends on the outlet side in the end section 7 of the EGR line 2, namely coaxially with the end section 7 and at least up to its mouth opening 8 Fig. 9 an outlet-side end of the fresh air auxiliary line 22 can be seen, which is arranged concentrically in the outlet opening 8.
- fresh air can be introduced centrally into the exhaust gas flow 6, which enters the fresh air line 4 through the outlet opening 8 during active exhaust gas recirculation.
- the fresh air entering the fresh air auxiliary line 22 on the inlet side and exiting on the outlet side is in Fig. 9 symbolized by arrows 23.
- the outlet end of the fresh air auxiliary line 22 is also aligned with the closure body 13. Accordingly, the closure body 13 is acted upon by active fresh exhaust gas recirculation with the centrally flowing fresh air 23 from the fresh air auxiliary line 22, which flows around the closure body 13 , As a result, a protective film of fresh air is virtually formed for the closure body 13, which prevents or at least impedes direct contact of the closure body 13 with the recirculated exhaust gases 6. The danger of pollution of the closure body 13 is thereby significantly reduced.
- the fresh air auxiliary line 22 is coupled on the inlet side with a corresponding fresh air source.
- the fresh air auxiliary line 22 extends on the inlet side into the fresh air line 4, in such a way that its inlet end is located upstream of the mouth opening 8 of the EGR line 2. This is achieved here in that the fresh air auxiliary line 22 extends through an unspecified wall of the EGR line 2 therethrough. The inlet-side end of the fresh air auxiliary line 22 is then located upstream of the EGR line 2 in the fresh air line 4.
- the fresh air auxiliary line 22 extends in a straight line between its ends as here.
- the positioning of the outlet end of the fresh air line 22 within the mouth opening 8 is advantageously carried out so that at least the mouth opening 8 can be closed in a desired manner by means of the closure body 13 with deactivated exhaust gas recirculation.
- the outlet end of the fresh air auxiliary line 22 can also be closed by means of the closure body 13. If a predetermined minimum gap is to remain open as the minimum cross section for the outlet opening 8, the fresh air auxiliary line can be opened with the aid of the outlet end 22 define a corresponding stop for the closure body 13.
- the fresh air 23, which is injected centrally into the recirculated exhaust gases 6, is removed internally from the fresh air line 4.
- an external supply of fresh air 23 is conceivable.
- the fresh air auxiliary pipe 22 could be like the second EGR pipe 2 'in the embodiment of FIG Fig. 8 coaxially within the (first) EGR line 2 and connected at a suitable location to a corresponding fresh air supply.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Abgasrückführeinrichtung für eine Brennkraftmaschine, insbesondere in einem Kraftfahrzeug, mit den Merkmalen des Oberbegriffs des Anspruchs 1.The present invention relates to an exhaust gas recirculation device for an internal combustion engine, in particular in a motor vehicle, having the features of the preamble of
Aus der
Bei der bekannten Abgasrückführeinrichtung weist das Abgasrückführventil außerdem eine in der Frischluftleitung angeordnete Hülse auf, welche die wenigstens eine Abgasrückführleitung im Bereich der Mündungsöffnung umhüllt, welche in der Frischluftleitung axial verstellbar gelagert ist und welche radial innen eine Düsenkontur mit einem in Strömungsrichtung erst abnehmenden und dann zunehmenden Strömungsquerschnitt aufweist. Darüber hinaus ist das Abgasrückführventil mit einer Stelleinrichtung zum axialen Verstellen der Hülse relativ zur Frischluftleitung ausgestattet.In the known exhaust gas recirculation device, the exhaust gas recirculation valve also has a arranged in the fresh air pipe sleeve which surrounds the at least one exhaust gas recirculation line in the region of the mouth opening, which is mounted axially adjustable in the fresh air line and which radially inside a nozzle contour with a first decreasing in the flow direction and then increasing Has flow cross-section. In addition, the exhaust gas recirculation valve is equipped with an adjusting device for axial adjustment of the sleeve relative to the fresh air line.
Weitere Abgasrückführeinrichtungen, die mit einer Düsenkontur arbeiten, sind aus der
Die Erfindung beschäftigt sich mit dem Problem, für eine Abgasrückführeinrichtung der eingangs genannten Art eine verbesserte Ausführungsform anzugeben, die sich insbesondere dadurch auszeichnet, dass sich die Abgasrückführrate besser einstellen lässt.The invention is concerned with the problem of providing an improved embodiment for an exhaust gas recirculation device of the type mentioned, which is characterized in particular by the fact that the exhaust gas recirculation rate can be better adjusted.
Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This problem is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims.
Die Erfindung beruht auf dem allgemeinen Gedanken, die Rückführrate mittels einer Düse aerodynamisch zu steuern. Die Steuerung der Rückführrate erfolgt dabei durch die axiale Relativlage zwischen Mündungsöffnung und Düse, da der in der Mündungsöffnung herrschende Druck von der axialen Position der Mündungsöffnung innerhalb der Düse abhängt. Dieses Steuerungsprinzip wird bei der Erfindung damit kombiniert, dass der die Mündungsöffnung aufweisende Endabschnitt innerhalb der Frischluftleitung ortsfest angeordnet ist, während eine die Düse aufweisende oder ausbildende Hülse in der Frischluftleitung verstellbar angeordnet ist. Hierdurch gelangt die Abgasströmung ungehindert bis zur Mündungsöffnung, ohne dabei bewegliche Teile zu beaufschlagen. Des Weiteren ist es durch die vorgeschlagene Bauweise möglich, die Hülse mit einer Stelleinrichtung zu verstellen, ohne dass dabei die Stelleinrichtung mit den rückgeführten Abgasen beaufschlagt wird. Diese Bauweise reduziert die Gefahr einer Verrußung oder Versottung von Komponenten der Abgasrückführeinrichtung, da ein Kontakt mit den rückgeführten Abgasen weitgehend vermieden wird. Darüber hinaus erfolgt die Einleitung der Abgase in die Frischluftströmung im Bereich der Düse, also in einem Bereich erhöhter Strömungsgeschwindigkeiten. Höhere Strömungsgeschwindigkeiten reduzieren jedoch die Gefahr von Verrußung und Versottung.The invention is based on the general idea to aerodynamically control the return rate by means of a nozzle. The control of the return rate is effected by the axial relative position between the orifice and the nozzle, since the pressure prevailing in the orifice depends on the axial position of the orifice within the nozzle. This control principle is combined with the invention in that the end portion having the mouth opening is arranged stationary within the fresh air line, while a sleeve having or forming the nozzle is arranged adjustably in the fresh air line. As a result, the exhaust gas flow reaches unhindered to the mouth opening, without affecting moving parts. Furthermore, it is possible by the proposed construction, the sleeve with a Adjustment to adjust without causing the actuator is acted upon by the recirculated exhaust gases. This design reduces the risk of sooting or sooting of components of the exhaust gas recirculation device, since contact with the recirculated exhaust gases is largely avoided. In addition, the introduction of the exhaust gases takes place in the fresh air flow in the region of the nozzle, ie in a range of increased flow velocities. However, higher flow rates reduce the risk of sooting and sooting.
Erfindungsgemäß ist an der Hülse zumindest ein Verschlusskörper, vorzugsweise koaxial zur Mündungsöffnung, angeordnet, der bei maximal stromauf verstellter Hülse mit der Mündungsöffnung zum Einstellen eines minimalen Öffnungsquerschnitts der wenigstens einen Abgasrückführleitung zusammenwirkt. Auf diese Weise lässt sich die Rückführrate in Grenzen, die nicht mehr aerodynamisch gesteuert werden können, mechanisch steuern. Insbesondere lässt sich im Grenzfall auch eine Rückführrate mit dem Wert Null einstellen. Das heißt, die Abgasrückführleitung kann gesperrt werden, indem der Verschlusskörper die Mündungsöffnung verschließt.According to the invention, at least one closure body, preferably coaxially with the mouth opening, is arranged on the sleeve and, with the mouth maximally upstream, with the mouth opening for adjusting a minimum opening cross-section of the at least one exhaust gas recirculation line cooperates. In this way, the return rate can be controlled within limits that can not be controlled aerodynamically, mechanically. In particular, a return rate with the value zero can be set in the limiting case. That is, the exhaust gas recirculation line can be blocked by the closure body closes the mouth opening.
Gemäß einer anderen vorteilhaften Ausführungsformen kann die Stelleinrichtung, mit deren Hilfe die Hülse relativ zur Frischluftleitung axial verstellt werden kann, mit wenigstens einem elektromagnetischen Stellantrieb ausgestattet sein, der mittels elektromagnetischer Kräfte die Hülse axial verstellen kann. Da somit seitens des Stellantriebs bewegliche Bauteile wegfallen, reduziert sich auch die Gefahr einer Verrußung oder Versottung von Komponenten des Stellantriebs. Gleichzeitig ist es möglich, den Stellantrieb außerhalb der Frischluftleitung anzuordnen, wodurch der komplette Stellantrieb weder den Abgasen noch der Frischluft ausgesetzt ist.According to another advantageous embodiment, the adjusting device, by means of which the sleeve can be adjusted axially relative to the fresh air line, be equipped with at least one electromagnetic actuator, which can adjust the sleeve axially by means of electromagnetic forces. As a result of the actuator omitted moving components, also reduces the risk of sooting or sooting of components of the actuator. At the same time it is possible to arrange the actuator outside the fresh air line, whereby the entire actuator is exposed neither the exhaust gases nor the fresh air.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained not only in the combination given, but also in others Combinations or alone, without departing from the scope of the present invention.
Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.
Es zeigen, jeweils schematisch,
- Fig. 1 bis 9
- jeweils eine teilweise geschnittene perspektivische Ansicht auf eine Abgasrückführeinrichtung nach der Erfindung, bei unterschiedlichen Zuständen bzw. bei unterschiedlichen Ausführungsformen.
- Fig. 1 to 9
- in each case a partially cutaway perspective view of an exhaust gas recirculation device according to the invention, in different states or in different embodiments.
Entsprechend den
Dementsprechend zeigen die
Mit Hilfe des AGR-Ventils 3 kann die AGR-Leitung 2 gesteuert werden. Das heißt, die Menge der rückgeführten Abgase, also die AGR-Rate kann mit Hilfe des AGR-Ventils 3 eingestellt werden. Zu diesem Zweck weist das AGR-Ventil 3 eine Hülse 10 auf. Die Hülse 10 ist im Inneren der Frischluftleitung 4 angeordnet, und zwar so, dass sie die AGR-Leitung 2 bzw. deren Endabschnitt 7 im Bereich der Mündungsöffnung 8 umhüllt. Des Weiteren ist die Hülse 10 an ihrer der Mündungsöffnung 8 zugewandten Innenseite, also radial innen, mit einer Düsenkontur 11 versehen. Diese Düsenkontur 11 charakterisiert sich dadurch, dass sie einen Strömungsquerschnitt aufweist, der in der Strömungsrichtung der Frischluftströmung 5 zuerst abnimmt und dann wieder zunimmt. Dabei ist ein anströmseitiger Axialabschnitt der Düsenkontur 11 mit dem abnehmenden Strömungsquerschnitt axial kürzer als ein abströmseitiger Axialabschnitt mit dem zunehmenden Strömungsquerschnitt. Beispielsweise ist der anströmseitige Axialabschnitt etwa halb so groß wie der abströmseitige Axialabschnitt. Zweckmäßig ist die Düsenkontur 11 als Venturi-Düse ausgestaltet, das heißt, der Querschnittsverlauf innerhalb der Düsenkontur 11 ist so gewählt, dass sich eine Venturi-Düse ausbildet.With the aid of the
Des Weiteren ist die Hülse 10 relativ zur Frischluftleitung 4 axial verstellbar angeordnet und ist hierzu vorzugsweise an der Frischluftleitung 4 axial verstellbar gelagert. Außerdem umfasst das AGR-Ventil 3 eine Stelleinrichtung 12, mit deren Hilfe die Hülse 10 relativ zur Frischluftleitung 4 verstellt werden kann. Durch die Verstellbarkeit der Hülse 10 kann die Relativlage der Mündungsöffnung 8 innerhalb der Düsenkontur 11 eingestellt werden. Bei der Durchströmung der Düsenkontur 11 kommt es zu einer Änderung des in der Frischluftströmung 5 herrschenden Drucks, wobei der aktuelle Druckwert von der aktuellen Position innerhalb der Düsenkontur 11 abhängt. Dementsprechend kann der an der Mündungsöffnung 8 herrschende Druck durch Einstellen der Relativlage zwischen Mündungsöffnung 8 und Hülse 10 variiert werden. Mit dem an der Mündungsöffnung 8 herrschenden Druck korreliert jedoch auch die Menge der rückgeführten Abgase, also die AGR-Rate. Letztlich kann somit durch Positionieren der Hülse 10 relativ zur Mündungsöffnung 8 die AGR-Rate eingestellt werden.Furthermore, the
Bei den hier gezeigten Ausführungsformen ist das AGR-Ventil 3 außerdem mit wenigstens einem Verschlusskörper 13 ausgestattet, der bezüglich der Hülse 10 ortsfest angeordnet ist. Dieser Verschlusskörper 13 ist dabei koaxial zur Mündungsöffnung 8 positioniert. Bei einer Verstellung der Hülse 10 entgegen der Frischluftströmung 5 nähert sich der Verschlusskörper 13 der Mündungsöffnung 8 an. Bei maximal stromauf verstellter Hülse 10 wirkt der Verschlusskörper 13 mit der Mündungsöffnung 8 zum Einstellen eines minimalen Öffnungsquerschnitts der AGR-Leitung 2 zusammen.In the embodiments shown here, the
Der Verschlusskörper 13 ist zweckmäßig mit einem Strömungsprofil ausgestattet. Dieses Strömungsprofil kann beispielsweise als Tropfenprofil gestaltet sein. Vorzugsweise weist der Verschlusskörper 13 bei den hier gezeigten Ausführungsformen anströmseitig ein Halbkugelprofil auf und kann abströmseitig mit einem Kegelprofil ausgestattet sein. Wesentlich ist, dass der Verschlusskörper 13, wenn er zum Verschließen der Mündungsöffnung 8 vorgesehen ist, zumindest anströmseitig komplementär zur Mündungsöffnung 8 geformt ist. Bei einer kreisförmigen Mündungsöffnung 8 wird daher eine Halbkugelform für die Anströmseite des Verschlusskörpers 13 bevorzugt. Grundsätzlich sind auch andere Formen für den Verschlusskörper 13 denkbar, die sich ebenfalls durch einen geringen Strömungswiderstand auszeichnen.The
Darüber hinaus kann der Verschlusskörper 13 und zusätzlich oder alternativ die jeweilige Mündungsöffnung 8 mit einer haftungsreduzierenden Beschichtung versehen sein. Eine derartige Beschichtung, beispielsweise mittels PTFE oder Silikon, kann eine Anlagerung von Schmutzpartikeln an der Mündungsöffnung 8 bzw. am Verschlusskörper 13 reduzieren. Optional kann auch zumindest ein Dichtelement vorgesehen sein, das am Verschlusskörper 13 und/oder an der Mündungsöffnung 8 angeordnet ist.In addition, the
Der Verschlusskörper 13 ist an der Hülse 10 befestigt. Vorzugsweise erfolgt die Verbindung zwischen Hülse 10 und Verschlusskörper 13 mittels wenigstens eines Radialstegs 14. Bei den Ausführungsformen der
Die Stelleinrichtung 12 umfasst einen Stellantrieb 15, mit dessen Hilfe die Hülse 10 antreibbar ist. Bei den Ausführungsformen der
Im Unterschied dazu ist bei den Ausführungsformen gemäß den
Bei den Ausführungsformen der
Im Unterschied dazu ist bei der Ausführungsform gemäß
Wie hier besonders deutlich zu erkennen ist, können die einzelnen Radialstege 19 bzw. 17 bzw. 14 aerodynamisch so profiliert sein, dass sie einen möglichst niedrigen Strömungswiderstand aufweisen.As can be seen particularly clearly here, the individual
Die in
Bei der Ausführungsform gemäß
Zusätzlich oder alternativ kann der elektromagnetisch arbeitende Stellantrieb 15 auch mit einem hier nicht gezeigten Stellglied 16 zusammenwirken, das mit der Hülse 10 verbunden ist, um die Hülse 10 zum axialen Verstellen anzutreiben.Additionally or alternatively, the
Gemäß einer vorteilhaften Ausführungsform kann das AGR-Ventil 3 außerdem mit einer Rückstelleinrichtung ausgestattet sein, die bei den hier gezeigten Ausführungsformen jedoch nicht dargestellt ist. Eine derartige Rückstelleinrichtung kann beispielsweise in Form einer Rückstellfeder vorgesehen sein und insbesondere in den Stellantrieb 15 integriert sein. Die Rückstelleinrichtung ist so ausgestaltet, dass sie die Hülse 10 bei ausgefallener oder ausgeschalteter Stelleinrichtung 12 stromauf antreibt. Mit Hilfe der Rückstelleinrichtung nimmt die Hülse 10 somit von selbst eine Position mit minimierter AGR-Rate ein. Sofern der Verschlusskörper 13 vorgesehen ist, wird dieser in die Position mit minimalem Öffnungsquerschnitt bzw. in die Verschlussposition angetrieben.According to an advantageous embodiment, the
Entsprechend der in
In
Zwar sind die hier gezeigten Strömungsleitelemente 20, 20' grundsätzlich einer starken Beaufschlagung mit Abgas ausgesetzt, jedoch sind diese Strömungsleitelemente 20, 20' nicht an der Einstellung der AGR-Rate beteiligt, so dass eine Verrußung oder Versottung dieser Strömungsleitelemente 20, 20' keinen Einfluss auf die Funktionsweise der AGR-Einrichtung 1 hat.Although the
Zusätzlich oder alternativ zu dem wenigstens einen Strömungsleitelement 20, 20' kann der Endabschnitt 7 zumindest in einem die Mündungsöffnung 8 aufweisenden Endbereich 21 gegenüber der Strömungsrichtung der Frischluftströmung 5 einen geneigten Verlauf aufweisen. Auf diese Weise erhält das Abgas an der Mündungsöffnung 8 eine Richtungskomponente, die das Abgas an dem fluchtend zur Mündungsöffnung 8 angeordneten Verschlusskörper 13 vorbeiführt. Mit Hilfe des geneigten Endbereichs 21 und/oder mit Hilfe des wenigstens einen Strömungsleitelements 20; 21 wird eine direkte Beaufschlagung des Verschlusskörpers 13 mit den rückgeführten Abgasen vermieden, wodurch die Gefahr einer Versottung oder Verrußung des Verschlusskörpers 13 reduziert ist.In addition or as an alternative to the at least one
Bei den hier gezeigten Ausführungsformen erstreckt sich der Endabschnitt 7 zumindest bereichsweise parallel zur Frischluftleitung 4. Zweckmäßig ist der Endabschnitt 7 oder zumindest die Mündungsöffnung 8 konzentrisch innerhalb der Frischluftleitung 4 angeordnet. Grundsätzlich ist jedoch auch eine exzentrische Anordnung der Mündungsöffnung 8 möglich.In the embodiments shown here, the
Bei den Ausführungsformen der
Bei der Ausführungsform gemäß
Im Unterschied dazu sind bei der Ausführungsform gemäß
Bei dieser Ausführungsform sind auch die Mündungsöffnungen 8, 8' der beiden AGR-Leitungen 2, 2' innerhalb der Frischluftleitung 4 konzentrisch zueinander angeordnet bzw. konzentrisch ineinander angeordnet. Dabei können die beiden Mündungsöffnungen 8, 8' in axialer Richtung zueinander versetzt angeordnet sein, derart, dass ein gemeinsamer Verschlusskörper 13 ausreicht, die Mündungsöffnung 8 der äußeren AGR-Leitung 2 oder gleichzeitig beide Mündungsöffnungen 8, 8' zu verschließen.In this embodiment, the
Entsprechend
Um Frischluft 23 zentral in die rückgeführten Abgase 6 einleiten zu können, ist die Frischlufthilfsleitung 22 einlassseitig mit einer entsprechenden Frischluftquelle gekoppelt. Im vorliegenden Fall erstreckt sich die Frischlufthilfsleitung 22 einlassseitig bis in die Frischluftleitung 4, und zwar so, dass sich ihr einlassseitiges Ende stromauf der Mündungsöffnung 8 der AGR-Leitung 2 befindet. Erreicht wird dies hier dadurch, dass sich die Frischlufthilfsleitung 22 durch eine nicht näher bezeichnete Wandung der AGR-Leitung 2 hindurch erstreckt. Das einlassseitige Ende der Frischlufthilfsleitung 22 befindet sich dann stromauf der AGR-Leitung 2 in der Frischluftleitung 4. Vorzugsweise erstreckt sich die Frischlufthilfsleitung 22 wie hier zwischen ihren Enden geradlinig.To be able to introduce
Die Positionierung des auslassseitigen Endes der Frischluftleitung 22 innerhalb der Mündungsöffnung 8 erfolgt zweckmäßig so, dass mit Hilfe des Verschlusskörpers 13 bei deaktivierter Abgasrückführung zumindest die Mündungsöffnung 8 in gewünschter Weise verschlossen werden kann. Gleichzeitig kann außerdem das auslassseitige Ende der Frischlufthilfsleitung 22 mit Hilfe des Verschlusskörpers 13 verschlossen werden. Sofern als Minimalquerschnitt für die Mündungsöffnung 8 ein vorbestimmter Mindestspalt offen bleiben soll, lässt sich mit Hilfe des auslassseitigen Endes der Frischlufthilfsleitung 22 ein entsprechender Anschlag für den Verschlusskörper 13 definieren.The positioning of the outlet end of the
Es ist klar, dass bei einer Ausführungsform mit zwei AGR-Leitungen 2, 2' auch dementsprechend zwei Frischlufthilfsleitungen 22 vorgesehen sein können.It is clear that in an embodiment with two
Bei der in
Claims (15)
- An exhaust gas recirculation device for an internal combustion engine, in particular in a motor vehicle,- comprising at least one exhaust gas recirculation line (2, 2') for introducing exhaust gas into a fresh air line (4) of the internal combustion engine,- comprising an exhaust gas recirculation valve (3) for controlling the at least one exhaust gas recirculation line (2, 2'),- wherein the at least one exhaust gas recirculation line (2, 2') encompasses an end section (7, 7'), which runs in the fresh air line (4) and which encompasses an orifice (8, 8'), which is open in axial direction,- wherein the exhaust gas recirculation valve (3) encompasses a sleeve (10), which is arranged in the fresh air line (4) and which encloses the at least one exhaust gas recirculation line (2, 2') in the region of the orifice (8, 8'), which is mounted in the fresh air line (4) so as to be adjustable in axial direction and which encompasses a radial internal nozzle contour (11) comprising a flow cross section, which first decreases and then increases in flow direction,- wherein the exhaust gas recirculation valve (3) encompasses an actuating device (12) for adjusting the sleeve (10) in axial direction relative to the fresh air line (4),characterized in
that at least one closing element (13, 13'), which interacts with the orifice (8, 8') to adjust a minimal opening cross section of the at least one exhaust gas recirculation line (2, 2') when the sleeve (10) is maximally adjusted in upstream direction, is arranged on the sleeve (10). - The exhaust gas recirculation device according to claim 1,
characterized in- that the at least one closing element (13, 13') closes the orifice (8, 8') when the sleeve (10) is maximally adjusted in upstream direction or- that the maximal opening cross section is a gap, in particular an annular gap, between closing element (13, 13') and end section (7, 7'). - The exhaust gas recirculation device according to claim 1 or 2,
characterized in
that the at least one closing element (13, 13') is arranged in coaxial direction to the respective orifice (8, 8'). - The exhaust gas recirculation device according to one of claims 1 to 3,
characterized in
that the at least one closing element (13) encompasses a flow profile. - The exhaust gas recirculation device according to one of claims 1 to 4,
characterized in
that the at least one closing element (13, 13') and/or the respective orifice (8, 8') is/are provided with an adhesion-reducing coating. - The exhaust gas recirculation device according to one of claims 1 to 5,
characterized in
that provision is made for a readjusting device, which activates the sleeve (10) in upstream direction when the actuating device (12) is turned off. - The exhaust gas recirculation device according to one of claims 1 to 6,
characterized in
that provision is made for at least one flow guide element (20, 20'), which at least partially guides the exhaust gases escaping from the orifice (8, 8') in response to an active exhaust gas recirculation past the closing element (13, 13'). - The exhaust gas recirculation device according to claim 7,
characterized in
that at least one flow guide element (20') is arranged in the end section (7, 7') of the exhaust gas recirculation line (2, 2') upstream of the orifice (8, 8'). - The exhaust gas recirculation device according to claim 7 or 8,
characterized in
that the at least one flow guide element (20) is fastened to the end section (7) of the exhaust gas recirculation line (2, 2') and is arranged downstream from the orifice (8, 8') in the fresh air line (4). - The exhaust gas recirculation device according to one of claims 7 to 9,
characterized in
that the at least one flow guide element (20) is fastened to the sleeve (10) and/or to the closing element (13, 13') and is arranged upstream of the closing element (13, 13') in the fresh air line (4). - The exhaust gas recirculation device according to one of claims 7 to 10,
characterized in
that the end section (7) is inclined relative to the flow direction in the fresh air line (4) at least in an end region (21) encompassing the orifice (8, 8'). - The exhaust gas recirculation device according to one of claims 1 to 11,
characterized in
that provision is made for at least one fresh air auxiliary line (22), which extends in coaxial direction at the outlet side in the end section (7, 7') at least up to the orifice (8, 8') and by means of which fresh air (23) can be introduced centrally into an exhaust gas flow (6) entering into the fresh air line (4) through the orifice (8, 8'). - The exhaust gas recirculation device according to claim 12,
characterized in
that the at least one fresh air auxiliary line (22) extends at the inlet side up to the fresh air line (4) upstream of the orifice (8, 8'). - The exhaust gas recirculation device according to claim 12 or 13,
characterized in
that the at least one fresh air auxiliary line (22) extends straight between its ends and/or through a wall of the respective exhaust gas recirculation line (2, 2') . - The exhaust gas recirculation device according to one of claims 1 to 14,
characterized in
that the nozzle contour (11) is embodied as a Venturi nozzle.
Applications Claiming Priority (2)
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DE102005020484A DE102005020484A1 (en) | 2005-04-29 | 2005-04-29 | Exhaust gas recirculation device for internal combustion engine, has exhaust gas recirculation valve for controlling exhaust gas recirculation line and comprising actuating device for axially adjusting sleeve relative to fresh-air duct |
PCT/DE2006/000431 WO2006116957A1 (en) | 2005-04-29 | 2006-03-11 | Exhaust gas recirculation device |
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EP1875061B1 true EP1875061B1 (en) | 2009-05-13 |
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EP06722588A Active EP1875061B1 (en) | 2005-04-29 | 2006-03-11 | Exhaust gas recirculation device |
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DE4429232C1 (en) * | 1994-08-18 | 1995-09-07 | Daimler Benz Ag | Exhaust back guiding device for charged combustion engine |
DE19549107A1 (en) * | 1995-12-29 | 1997-07-03 | Bosch Gmbh Robert | Device for exhaust gas recirculation with a closing element which can be actuated in the intake duct |
DE19927186A1 (en) * | 1999-06-15 | 2000-12-28 | Daimler Chrysler Ag | Exhaust gas recirculation device with a poppet valve |
SE9902966L (en) * | 1999-08-23 | 2000-11-27 | Motortestct Mtc Ab | Device for transferring exhaust gases from a supercharged combustion engine exhaust collector to its inlet line |
US6267106B1 (en) * | 1999-11-09 | 2001-07-31 | Caterpillar Inc. | Induction venturi for an exhaust gas recirculation system in an internal combustion engine |
DE10019409C5 (en) * | 2000-04-19 | 2004-04-29 | Daimlerchrysler Ag | Exhaust gas recirculation device for internal combustion engines |
US6343594B1 (en) * | 2000-06-01 | 2002-02-05 | Caterpillar Inc. | Variable flow venturi assembly for use in an exhaust gas recirculation system of an internal combustion engine |
SE517251C2 (en) * | 2000-08-30 | 2002-05-14 | Gustav Berggren | Component for controlling exhaust gas reflux |
US6408833B1 (en) * | 2000-12-07 | 2002-06-25 | Caterpillar Inc. | Venturi bypass exhaust gas recirculation system |
SE522310C2 (en) * | 2001-03-02 | 2004-02-03 | Volvo Lastvagnar Ab | Apparatus and method for supplying recycled exhaust gases |
JP4526395B2 (en) * | 2004-02-25 | 2010-08-18 | 臼井国際産業株式会社 | Internal combustion engine supercharging system |
US6886544B1 (en) * | 2004-03-03 | 2005-05-03 | Caterpillar Inc | Exhaust gas venturi injector for an exhaust gas recirculation system |
US7261096B2 (en) * | 2005-11-17 | 2007-08-28 | Haldex Hydraulics Ab | Movable sleeve exhaust gas recirculation system |
DE102006009153A1 (en) * | 2006-02-24 | 2007-08-30 | Mahle International Gmbh | Exhaust gas recirculation device |
-
2005
- 2005-04-29 DE DE102005020484A patent/DE102005020484A1/en not_active Withdrawn
-
2006
- 2006-03-11 DE DE502006003726T patent/DE502006003726D1/en active Active
- 2006-03-11 US US11/912,827 patent/US7798135B2/en not_active Expired - Fee Related
- 2006-03-11 EP EP06722588A patent/EP1875061B1/en active Active
- 2006-03-11 WO PCT/DE2006/000431 patent/WO2006116957A1/en active Application Filing
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010007790A1 (en) | 2010-02-12 | 2011-08-18 | Dr. Ing. h.c. F. Porsche Aktiengesellschaft, 70435 | Exhaust gas recirculation system for internal combustion engine, has suction line and exhaust gas recirculation line, where exhaust gas recirculation line is flowed in air filter, by which suction line runs |
DE102015200196A1 (en) | 2015-01-09 | 2016-07-14 | Elringklinger Ag | Mixing device, internal combustion engine and method for producing a mixing device |
DE102016010582A1 (en) | 2016-09-02 | 2018-03-08 | Deutz Aktiengesellschaft | Exhaust gas recirculation device for an internal combustion engine |
DE102016010582B4 (en) | 2016-09-02 | 2022-01-27 | Deutz Aktiengesellschaft | Exhaust gas recirculation device for an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
US7798135B2 (en) | 2010-09-21 |
WO2006116957A1 (en) | 2006-11-09 |
US20090050120A1 (en) | 2009-02-26 |
DE102005020484A1 (en) | 2006-11-02 |
DE502006003726D1 (en) | 2009-06-25 |
EP1875061A1 (en) | 2008-01-09 |
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