EP1826391A2 - Dispositif de recyclage des gaz d'échappement - Google Patents

Dispositif de recyclage des gaz d'échappement Download PDF

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Publication number
EP1826391A2
EP1826391A2 EP06126368A EP06126368A EP1826391A2 EP 1826391 A2 EP1826391 A2 EP 1826391A2 EP 06126368 A EP06126368 A EP 06126368A EP 06126368 A EP06126368 A EP 06126368A EP 1826391 A2 EP1826391 A2 EP 1826391A2
Authority
EP
European Patent Office
Prior art keywords
section
wall portion
exhaust gas
fresh gas
venturi nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06126368A
Other languages
German (de)
English (en)
Other versions
EP1826391A3 (fr
Inventor
Rafael Weisz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP1826391A2 publication Critical patent/EP1826391A2/fr
Publication of EP1826391A3 publication Critical patent/EP1826391A3/fr
Withdrawn legal-status Critical Current

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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
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/18—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having elastic-wall valve members
    • 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
    • F02M26/17—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
    • 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
    • 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
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • 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
    • 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
    • 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
    • F02M35/10137—Flexible ducts, e.g. bellows or hoses
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0437—Liquid cooled heat exchangers
    • 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
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • 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
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors
    • 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
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines

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.
  • an exhaust gas recirculation device which has a return line and which is equipped with a fresh gas line section.
  • a Venturi nozzle is formed in an introduction region of the fresh gas line section.
  • the return line is now connected to the fresh gas line section so that it opens into a low-pressure region of the Venturi nozzle.
  • the pressure in the fresh gas line in many operating ranges of the internal combustion engine may be higher than the pressure in an exhaust pipe. Exhaust gas recirculation is then not possible without additional measures.
  • the pressure in the fresh gas line can be locally lowered so far that a sufficient pressure gradient between Exhaust pipe and fresh gas line is created to allow the desired exhaust gas recirculation.
  • the desired local pressure reduction can only be achieved if the flow velocities prevailing therein are relatively high, e.g. greater than 0.65 Mach.
  • the throughput is limited by a Venturi nozzle on the adjusting when reaching the speed of sound mass flow.
  • the design of the Venturi nozzle must therefore take into account the maximum required mass flow of fresh gas. At low engine speed and / or low load is reduced in many applications, the flow velocity in the Venturi so far that the pressure reduction required for the intake of the exhaust gases is not achieved.
  • the present invention is concerned with the problem of providing for an exhaust gas recirculation device of the type mentioned in an improved embodiment, which is particularly characterized in that it operates reliably in a relatively large operating range of the internal combustion engine and allows a sufficient, preferably adjustable, exhaust gas recirculation rate.
  • the invention is based on the general idea to design the Venturi nozzle with a variable nozzle geometry, such that the narrowest flow cross-section of the Venturi nozzle is variable or adjustable.
  • a comparatively large flow cross-section can thus be set in order to set the particular desired pressure drop and thus the respective desired return flow rate at a flow rate close to the speed of sound.
  • the flow cross-section can be narrowed accordingly, in order to realize flow velocities in the vicinity of the speed of sound. Accordingly, even with relatively small mass flows, a sufficient pressure reduction in the Venturi nozzle can be set in order to achieve the respectively desired exhaust gas recirculation rate.
  • variable venturi in a large, preferably in the entire, operating range of the internal combustion engine, to produce a pressure drop in the Venturi nozzle required to realize the respective desired exhaust gas recirculation rate.
  • the exhaust gas recirculation device is thereby more efficient and improves the pollutant emission of the engine equipped therewith over a wider operating range.
  • the adjustability of the flow cross section can be realized in principle with the Venturi nozzle in different ways.
  • An embodiment with such an adjustable wall section can be realized comparatively inexpensively.
  • an internal combustion engine 1 in particular in a motor vehicle, comprises an engine block 2 with a plurality of cylinders 3.
  • the internal combustion engine 1 has a fresh gas line 4 which supplies fresh gas to the cylinders 3.
  • an exhaust pipe 5 is provided, which discharges exhaust gas from the cylinders 3.
  • the internal combustion engine 1 is equipped with an exhaust gas recirculation device 6, which has a return line 7 and a fresh gas line section 8.
  • the fresh gas line section 8 is shown in FIG mounted state in the fresh gas line 4 installed.
  • the return line 7 connects in the illustrated assembled state, the exhaust pipe 5 with the fresh gas line section. 8
  • the Venturi nozzle 10 is designed such that it has a variable flow cross-section, which is symbolized in Fig. 1 by a control arrow 12.
  • the internal combustion engine 1 is a supercharged internal combustion engine 1, e.g. Diesel engine or gasoline engine, which has a charging device or a supercharger 13 in the fresh gas line 4.
  • the supercharger 13 is a compressor 14 of an exhaust-gas turbocharger 15, the turbine 16 of which is arranged in the exhaust-gas line 5.
  • another embodiment of the supercharger 13 is possible, for example a mechanically driven compressor, in particular Roots blower.
  • a charge air cooler 17 may be arranged downstream of the supercharger 13.
  • an exhaust gas recirculation cooler 18 may be arranged in the return line 7 upstream of the fresh gas line section 8. Furthermore, the return line 7, for example, the exhaust gas recirculation cooler 18, a check valve 19 include.
  • the exhaust gas recirculation device 6 can be equipped with an adjusting device 20 for realizing the adjustability of the narrowest flow cross section of the Venturi nozzle 10.
  • the adjusting device 20 may be an electric motor, in particular a stepper motor, or any other actuator that can operate electrically, magnetically, hydraulically and / or pneumatically.
  • the venturi 10 may have at least one adjustable wall section 21 in accordance with the embodiments shown here.
  • the adjustable wall portion 21 is adjustable with respect to its distance from an opposite wall portion 22.
  • the last-mentioned wall section 22 is fixed and is therefore referred to below as a fixed wall section 22.
  • the distance between the adjustable wall portion 21 and the fixed wall distance 22 is measured transversely to a flow direction 23 of the Venturi nozzle 10. This flow direction 23 is symbolized here by an arrow.
  • the wall sections 21, 22 of the Venturi nozzle 10 form in the flow direction 23 a Venturi nozzle profile, which first converges and then diverges.
  • the venturi 10 has transversely to its flow direction 23 is substantially a rectangular profile.
  • This construction simplifies the realization of the variable flow cross section by means of the adjustable wall section 21.
  • the wall sections 21, 22 are bounded laterally, ie transversely to the flow direction 23 by side walls 24, of which only one is visible in the illustrated sectional views. These side walls 24 may be flat in order to be able to displace the adjustable wall section 21 comparatively densely along the side walls 24 transversely to the flow direction 23.
  • the adjustable wall section 21 is formed by a resiliently bendable membrane 25.
  • the membrane 25, which may for example consist of a steel sheet, is fastened to its fresh gas line section 8 at its end sections 26, 27 which are spaced apart from one another in the throughflow direction 23.
  • at least one of these end sections 26, 27, in this case the downstream end section 27, is fastened to the fresh gas line section 8 such that it can be displaced in the throughflow direction 23 relative to the fresh gas line section 8.
  • This displacement can be achieved for example by means of a slot configuration 28, which is indicated in Fig. 3.
  • the membrane 25 is shaped so that it automatically assumes a starting position in which the distance between the two wall sections 21, 22 is maximum. In this starting position, it is biased by their spring property.
  • an additional spring can be installed, for example, a cylindrical coil spring which acts on the diaphragm 25 or on the valve or actuator 29 explained in more detail below, and in particular is arranged concentrically to the valve 29.
  • this initial position can be defined by the slot configuration 28.
  • the adjusting device 21 can adjust the diaphragm 25 in the direction of the fixed wall section 22, whereby the distance between the wall sections 21, 22 is reduced.
  • the minimum adjustable distance is again defined by the slot configuration 28.
  • the adjusting device 20 is drive-coupled to the adjustable wall section 21.
  • the adjusting device 20 on an actuator 29, which is designed here by way of example in the manner of a valve lifter.
  • the actuator 29 is drive-coupled to the diaphragm 25, by means of a driver 30 which cooperates with a driver plate 31.
  • the driver plate 31 is attached to the membrane 25 and forms together with the driver 30 a driver assembly.
  • the driver assembly 30, 31 may be configured so that it has a predetermined idle stroke. This means that the actuator 29 must first perform the idle stroke before its stroke adjustment causes an adjustment of the diaphragm 25.
  • the idle stroke is used to actuate a check valve 32, by means of which the return line 7 is blocked or can be opened.
  • a check valve 32 By means of which the return line 7 is blocked or can be opened.
  • the recirculated exhaust gas symbolized by an arrow 34, enters the venturi 10.
  • a valve seat 35 of the check valve 32 is formed which cooperates with a valve member 36. When retracted into its valve seat 35 valve member 36, the return line 7 is locked and turned off the exhaust gas recirculation.
  • said check valve 32 can be configured completely independently of the adjusting device 20.
  • the valve member 36 is formed on the actuator 29 of the actuator 20, so that via the actuator 20 at the same time the check valve 32 can be actuated. In order to open the check valve 32 at the maximum flow cross-section of the venturi 10, the aforementioned idle stroke is required.
  • the actuator 29 is in the direction of the distance between the two wall sections 21, 22, so transversely to the flow direction 23 stroke adjustable. Furthermore, the actuator 29 penetrates here the membrane 25 and extends in its stroke direction through the mouth opening 33 through to the return line 7. Accordingly, the actuator 29 passes through a passing through the Venturi nozzle 10 Flow path 37, which is also indicated by an arrow.
  • the return line 7 has a mouth section 38 which opens into the fresh gas line section 8 and can form an integral component together with the fresh gas line section 8.
  • this mouth section 38 has a longitudinal direction which runs essentially transversely to the throughflow direction 23.
  • the mouth opening 33 is arranged in the middle section of the venturi 10 and is therefore located in the region of the narrowest flow cross-section of the venturi 10. The relative position between the mouth 33 within the venturi 10 is stationary or invariant.
  • the actuator 20 may include an eccentric 39 to provide rotational movement, e.g. a rotary actuator to convert into the lifting movement of the actuator 29.
  • the exhaust gas recirculation device 6 may be equipped with a fail-safe function which sets a minimum Abraskostexrate, in particular to the value zero, for the exhaust gas recirculation, for example by the venturi 10 set to maximum flow area or minimum pressure drop is and in particular the check valve 19 and 32 is actuated to lock the return line 7.
  • the mouth section 38 of the return line 7 opening into the fresh gas line section 8 is arranged stationarily in the interior of the fresh gas line section 8, preferably such that the longitudinal direction of the mouth section 38 extends substantially parallel to the flow direction 23 , Furthermore, this mouth portion 38 is arranged in the fresh gas line section 8 so that the mouth opening 33 is open axially and in the flow direction 23. Furthermore, the arrangement of the mouth section 38 takes place in such a way that here too the mouth opening 33 is located in the region of the narrowest flow cross-section of the venturi 10.
  • the mouth portion 38 may have a cross-sectional profile which is elliptical in the mouth opening 33 and continuously merges upstream into a circular profile. In this way, the mouth section 38 in the region of the mouth opening 33 is adapted to the rectangular profile of the Venturi nozzle 10.
  • the actuator 29 is arranged exclusively on a side of the membrane 25 facing away from the flow path 37. That is, the actuator 29 does not protrude into the flow path 37 and thereby does not lead to a disturbance of the fresh gas flow in the fresh gas line section 8.
  • the actuator 29 is supported here on a large area of the membrane 25 via a driver plate 31.
  • the adjustable wall section 21 can be pivotally attached to the fresh gas line section 8 at one of its end sections 26, 27, here at the downstream end section 27 substantially around a pivot axis 40 extending transversely to the flow direction.
  • the adjustable wall section 21 may be designed as a resilient membrane in said end section 27 or may be fastened to the fresh gas line section 8 via a spring-elastic membrane 41. The bending deformation of the membrane 41 or of the membrane-like end section 27 results in the pivot axis 40, whose spatial position can change during the pivotal adjustment of the wall section 21.
  • the use of a hinge is possible, which provides a fixedly defined pivot axis 40.
  • the adjustable wall portion 21 is comparatively solid, but in particular designed rigid or rigid.
  • the actuator coupling of the adjustable wall portion 21 with the adjusting device 20 takes place in the region of the other, ie the upstream end portion 26.
  • the actuator 29 is wedge-shaped in the present case and in the manner of a slide along a flat wall 42 of the fresh gas line section 8 parallel to the flow direction 23 relative to the fresh gas line section 8 and thus relative to the adjustable wall section 21 adjustable.
  • the wedge-shaped actuator 29 has on its flow path 37 side facing a ramp 43, on which the adjustable wall section 21 rests with its upstream end section 26 and slides off during adjustment movements of the actuator 29 along the ramp 43.
  • the latter has, for example, a gear mechanism 44.
  • the adjustable wall section 21 can have at least two wall sections, namely a first wall section 45 and a second wall section 46, which overlap one another in the flow direction 23.
  • the first wall section 45 is pivotally attached to the fresh gas line section 8 at an end section 47 remote from the second wall section 46, which here is arranged at the outlet of the Venturi nozzle 10, about a pivot axis 48 extending transversely to the flow direction 23.
  • the first wall portion 45 is formed for example by a resilient membrane, for example made of sheet steel.
  • the pivotability about the pivot axis 48 results from bending deformations of the membrane-like first wall section 45 in the region of the fixed end section 47.
  • a hinge with a defined pivot axis 48 can alternatively be provided.
  • the second wall portion 46 is rotatably mounted on a shaft 50 at an end portion 49 remote from the first wall portion 45, which is arranged here at the inlet of the venturi 10.
  • Said shaft 50 is rotatably arranged on the fresh gas line section 8 about a rotation axis 51, which extends transversely to the flow direction 23 and parallel to the pivot axis 48.
  • the actuator 20 is, e.g. via gears 52, 53, drive-coupled to the shaft 50 and thereby drives the second wall portion 46 to pivotal adjustments with respect to the axis of rotation 51 at.
  • the shaft 50 forms the actuator 29 of the actuator 20.
  • the second wall section 46 abuts against the first wall section 45 on a side facing the flow path 37 and slides thereon.
  • the second wall section 46 can take along the first wall section 45 during pivoting, wherein it pivots about its pivot axis 48.
  • the first wall section 45 is preferably pivoted against a spring force. When turning back the second wall section 46, the first wall section 45 can follow automatically by said spring force.
  • the overlapping region 54 can be arranged, for example, in the region of the narrowest flow cross-section of the Venturi nozzle 10, that is to say essentially centrally.
  • the exhaust gas recirculation device 6 makes it possible to adjust the exhaust gas recirculation rate by adjusting the pressure drop in the low pressure region 11 of the venturi 10 by varying the (narrowest) flow cross section of the venturi 10.
  • sufficient exhaust gas recirculation can be realized even with comparatively small fresh gas volume flows by reducing the flow cross section of the Venturi 10 until flow velocities in the Venturi 10 are established which produce the pressure drop in the low pressure region 11 required for the exhaust gas intake.
  • the pressure drop in the Venturi nozzle 10 is adjusted so that the exhaust gas recirculation amount reaches the desired or required value. This value as well as other engine values may e.g. be stored in the engine control as a map.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP06126368A 2006-02-24 2006-12-18 Dispositif de recyclage des gaz d'échappement Withdrawn EP1826391A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006009153A DE102006009153A1 (de) 2006-02-24 2006-02-24 Abgasrückführeinrichtung

Publications (2)

Publication Number Publication Date
EP1826391A2 true EP1826391A2 (fr) 2007-08-29
EP1826391A3 EP1826391A3 (fr) 2010-09-01

Family

ID=38038925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06126368A Withdrawn EP1826391A3 (fr) 2006-02-24 2006-12-18 Dispositif de recyclage des gaz d'échappement

Country Status (3)

Country Link
US (1) US7353811B2 (fr)
EP (1) EP1826391A3 (fr)
DE (1) DE102006009153A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2917131A1 (fr) * 2007-06-06 2008-12-12 Renault Sas Moteur a combustion interne comportant un dispositif apte a animer d'un mouvement tourbillonnaire ordonne les gaz d'echappement recircules injectes.
FR2921433A1 (fr) * 2007-09-25 2009-03-27 Mann & Hummel Gmbh Dispositif de mise en tourbillonnement et de melange de gaz d'echappement recycles dans la tubulure d'aspiration d'un moteur a combustion interne.
FR2929677A1 (fr) * 2008-04-02 2009-10-09 Renault Sas Dispositif d'obturation d'un conduit.
ITMI20091080A1 (it) * 2009-06-18 2010-12-19 Dellorto Spa Sistema ed apparecchiatura di controllo di egr nell'impianto di alimentazione di motori a combustione interna sovralimentati
WO2011061051A1 (fr) * 2009-11-19 2011-05-26 Pierbrug Gmbh Dispositif de réglage permettant de convertir un mouvement rotatif en un mouvement linéaire
WO2011067138A1 (fr) * 2009-12-01 2011-06-09 Pierbrug Gmbh Ensemble soupape pour moteur à combustion interne
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EP1826391A3 (fr) 2010-09-01
US7353811B2 (en) 2008-04-08

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