EP0812386A1 - Dispositif de recyclage de gaz d'echappement comportant un element de fermeture actionnable dans le canal d'aspiration - Google Patents

Dispositif de recyclage de gaz d'echappement comportant un element de fermeture actionnable dans le canal d'aspiration

Info

Publication number
EP0812386A1
EP0812386A1 EP96933317A EP96933317A EP0812386A1 EP 0812386 A1 EP0812386 A1 EP 0812386A1 EP 96933317 A EP96933317 A EP 96933317A EP 96933317 A EP96933317 A EP 96933317A EP 0812386 A1 EP0812386 A1 EP 0812386A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
intake duct
gas supply
bell
supply pipe
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.)
Granted
Application number
EP96933317A
Other languages
German (de)
English (en)
Other versions
EP0812386B1 (fr
Inventor
Hermann Moedinger
Thomas Linke
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0812386A1 publication Critical patent/EP0812386A1/fr
Application granted granted Critical
Publication of EP0812386B1 publication Critical patent/EP0812386B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F02M26/52—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

Definitions

  • the invention is based on a device for exhaust gas recirculation with a closing element which can be actuated in the intake duct according to the preamble of claim 1.
  • exhaust gas supply ducts are introduced laterally into the intake ducts and are e.g. Opened or closed via poppet valves.
  • the closure plates of the valves are placed in the suction channel on the respective opening of the corresponding exhaust gas supply channel or are lifted off the latter.
  • the drive for adjusting the closure plate takes place, for example, via vacuum boxes.
  • a device comparable to this is known from US Pat. No. 3,901,203.
  • the vacuum box moves a swivel flap there.
  • the entire exhaust gas recirculation valve is located in an exhaust gas line located outside the intake duct.
  • GB-PS 1 388 032 also describes an exhaust gas recirculation valve located outside the intake duct.
  • Newer exhaust gas recirculation valves are operated in a controlled manner.
  • the known closure plate in the intake duct is axially moved onto the with the aid of a pneumatic drive Moving the opening of the exhaust gas supply duct closed or away.
  • the drive-related elasticity, the exhaust gas pressure acting on the valve disk and the flow conditions in the intake duct result in undesired inaccuracies in the case of a continuous adjustment, especially in partial load operation with small valve gaps.
  • the subject matter of the invention is a device for exhaust gas recirculation in which on the one hand the exhaust gas supply duct and the adjusting drive are arranged in the intake duct and on the other hand the valve parts are designed in such a way that only minimal forces caused by the exhaust gas and fresh gas flow act on the closing element and its drive.
  • an essentially cylindrical exhaust gas supply pipe protrudes into the intake duct approximately perpendicular to the fresh gas flow, as part of an exhaust gas supply nozzle, which has an outlet opening in its cylindrical wall, and a rotary slide bell is arranged above the outlet opening as a closing element, which bell closes the exhaust gas supply pipe projecting into the intake duct at least in some areas.
  • the rotary slide bell is coupled to an electric swivel motor serving as an adjustment drive.
  • the electric swivel motor is, for example, a so-called electromagnetic rotary actuator.
  • a pulsating direct current is applied to the coil winding of this swivel motor.
  • the resulting torque of the rotor acts against one Return spring.
  • the coil winding together with an iron yoke can form the stator and a permanent magnet together with the swivel shaft can form the rotor.
  • the pivoting movement of the closing element can also be realized with the help of a stepper motor.
  • the outlet opening of the exhaust gas supply pipe protruding into the intake duct is arranged approximately transversely and behind the exhaust gas supply pipe with respect to the flow direction of the fresh gas flow.
  • This arrangement means that hardly any exhaust gas residues can be deposited in the valve or throttle valve area.
  • the exhaust gas can also be introduced at an angle to the fresh gas flow in order to achieve optimum mixing.
  • the exhaust gas supply pipe can be pivotally mounted as a component which can be inserted separately into the exhaust gas supply nozzle.
  • the closing element or the rotary slide bell is aligned with the exhaust gas supply nozzle and the exhaust gas supply pipe.
  • the center lines of the exhaust gas supply nozzle and the rotary valve bell can also be arranged slightly offset in parallel.
  • An offset which creates a small gap in the area of the outlet opening and a large gap on the opposite side of the exhaust gas supply pipe, brings about good valve tightness without the risk that the rotary slide bell jams in the gap due to contamination.
  • the device for exhaust gas recirculation has a closing element, the actuation of which requires only a slight force due to its design. Furthermore, the bell shape of the closing element provides a high level of security against vibration excitation from the exhaust system and, secondly, it is shake-proof with respect to its pivot axis by a balanced mass distribution. Furthermore, the direct drive enables highly dynamic and precise adjustment behavior.
  • FIG. 1 shows an exhaust gas recirculation valve that is arranged in an intake duct (10) of an internal combustion engine.
  • the exhaust gas is introduced into the intake duct (10) in the direction of the fresh gas flow behind a throttle valve (1).
  • an exhaust gas supply connection (11) is arranged on the outer wall of the intake duct (10), to which an exhaust gas supply line (not shown here) is flanged.
  • a separate exhaust gas supply pipe (12) is used, for example, in the exhaust gas supply connection (11).
  • the exhaust gas supply pipe (12) which can also be a tubular section formed on the exhaust gas supply connector (11), has a cylindrical outer contour and is closed with a base (13). In the part protruding into the intake duct (10), the exhaust gas supply pipe (12) has a round outlet opening (15).
  • the imaginary center line of the outlet opening (15) runs, for example, parallel to the center line of the intake duct (10).
  • a pivotable rotary valve bell (20) is positioned above the part of the exhaust gas supply pipe (12) which projects freely into the intake duct (10).
  • the pivot axis of the rotary valve bell (20) corresponds to the center line of the exhaust ⁇ feed tube (12).
  • the rotary valve bell (20) is a thin-walled master cylinder with a bottom in FIG. On the outside of the base, a bearing cylinder with a smaller diameter is arranged concentrically with the master cylinder.
  • the master cylinder has a bore (21) serving as a rotary slide valve opening which, for example, is congruent with the outlet opening (15) when the exhaust gas recirculation valve is open. Since the exhaust gas recirculation valve is shown in the closed state in FIG. 1, the rotary slide valve opening (21) is located on the rear side of the exhaust gas supply pipe (12) and is therefore only shown in broken lines.
  • the outlet opening (15) of the exhaust gas supply pipe (12) and the rotary slide valve opening (21) can have surfaces of different sizes and different contours.
  • the cross sections of the openings (15) and (21) can, if necessary, be coordinated so that each pivoting angle of the rotary valve bell (20) corresponds to a specific opening cross section, so that e.g. the opening cross section increases with increasing swivel angle.
  • rotary vane bell (20) can also have several
  • the bottom of the rotary vane bell (20) can have several recesses or bores in order to allow exhaust gas that is present in the gap between the exhaust gas supply pipe (12) and the rotary vane bell (20) to escape. By making such recesses, no axial force acting on the rotary valve bell (20) can develop. In addition, the exhaust gas escaping at the edge of the floor does not penetrate the adjusting drive (30).
  • An electric swivel motor (30) is used to store and adjust the rotary valve bell (20). It is accommodated in a drive housing (31) which projects from the intake duct (10) in the form of a tube.
  • the drive housing (31) is aligned in such a way that its center line coincides with the center line of the bore for receiving the exhaust gas supply connection (11) and at the same time intersects perpendicularly with the center line of the intake duct (10). Furthermore, the outward-facing end face of the drive housing (31) is oriented normal to the housing center line.
  • a rotary slide flange (32) is mounted on the flat end face of the tubular drive housing (31), which is followed by a rotary slide axis (35).
  • the free end of the rotary slide axis (35) engages in a bearing bore (16) provided in the base (13) of the exhaust gas supply pipe (12).
  • the rotary vane bell (20) is seated on a hollow shaft (36) which is double-roller-mounted on the rotary vane axis (35).
  • the roller bearing (37) arranged in the vicinity of the rotary slide flange (32) is a fixed bearing.
  • the drive housing (31) can be subjected to a slight excess pressure in order to protect the roller bearings from possibly penetrating exhaust gas particles.
  • a gap seal for example, can be provided in front of the free end of the hollow shaft (36) between the rotary slide bell (20) and the rotary slide axis (35) or the bottom (13).
  • plain bearings or cross spring joints can also be used. The latter are less sensitive to heat and dirt.
  • a coil (41) sits on the rear part of the hollow shaft (36). Et al these two components form the rotor of the electric swivel motor (30).
  • a magnetic stator (42) is arranged around the coil (41). It is fastened in an annular groove (33) provided in the rotary slide flange (32).
  • the electric swivel motor (30) has a swivel range of approximately 90 °, which is limited by stops (not shown). Closing the exhaust gas recirculation valve causes a spiral spring (44) which lies between the rotary slide flange (32) and the rear end of the hollow shaft (36). For this purpose, the spiral spring (44) is fastened to the hollow shaft (36) and to the rotary slide flange (32).
  • a thin-walled, pot-shaped cover (49) is arranged between the drive housing (31) and the stator (42).
  • the cover (49) is clamped on the outer edge of the annular groove (33) made in the rotary slide flange (32).
  • An O-ring is clamped in the inner wall area of the intake duct (10) for sealing at the transition point between the cover (49) and the drive housing (31).
  • a gap seal lies between the hollow shaft (36) and the cover (49).
  • the electric swivel motor (30) with its own housing, so that it forms a mounting assembly together with the rotary slide axis (35) and the rotary slide bell (20).
  • the assembly module can then be attached directly can be flanged to the intake duct (10) without the need for a molded drive housing (31) as shown in FIG.
  • the intake duct (10) has a corresponding opening for inserting the rotary valve bell (20).
  • the rotary slide bell (20) is kept open against the closing force of the coil spring (44) by controlled energization of the coil (41). An opening movement takes place by turning the rotary valve bell (20) counterclockwise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Characterised By The Charging Evacuation (AREA)

Abstract

L'invention concerne un dispositif de recyclage de gaz d'échappement, comportant un canal d'acheminement des gaz d'échappement, raccordé au canal d'aspiration (10). Le canal d'acheminement des gaz d'échappement peut être ouvert et fermé dans le canal d'aspiration par l'intermédiaire d'un élément de fermeture actionné par un système d'entraînement ajustable. A cette fin, un tuyau d'amenée (12) des gaz d'échappement sensiblement cylindrique dont la paroi cylindrique présente un orifice de sortie (15), fait saillie sous forme de segment d'une tubulure d'amenée de gaz d'échappement, dans le canal d'aspiration approximativement perpendiculairement au flux de gaz frais. Au-dessus de l'orifice de sortie, il est prévu une cloche de tiroir rotatif (20) servant d'élément de fermeture, qui entoure au moins partiellement le tuyau d'amenée des gaz d'échappement faisant saillie dans le canal d'aspiration. La cloche de tiroir rotatif est accouplée à un moteur électrique oscillant (30) servant de système d'entraînement ajustable. Il s'agit dans le cas présent d'un dispositif dans lequel il ne s'exerce sur l'élément de fermeture et son système d'entraînement ajustable, que des forces minimales produites par le flux de gaz d'échappement et le flux de gaz frais.
EP96933317A 1995-12-29 1996-08-23 Dispositif de recyclage de gaz d'echappement comportant un element de fermeture actionnable dans le canal d'aspiration Expired - Lifetime EP0812386B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19549107A DE19549107A1 (de) 1995-12-29 1995-12-29 Vorrichtung zur Abgasrückführung mit einem im Ansaugkanal betätigbaren Schließelement
DE19549107 1995-12-29
PCT/DE1996/001563 WO1997024522A1 (fr) 1995-12-29 1996-08-23 Dispositif de recyclage de gaz d'echappement comportant un element de fermeture actionnable dans le canal d'aspiration

Publications (2)

Publication Number Publication Date
EP0812386A1 true EP0812386A1 (fr) 1997-12-17
EP0812386B1 EP0812386B1 (fr) 2000-01-05

Family

ID=7781623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96933317A Expired - Lifetime EP0812386B1 (fr) 1995-12-29 1996-08-23 Dispositif de recyclage de gaz d'echappement comportant un element de fermeture actionnable dans le canal d'aspiration

Country Status (6)

Country Link
US (1) US5785034A (fr)
EP (1) EP0812386B1 (fr)
JP (1) JPH11504411A (fr)
KR (1) KR19980702578A (fr)
DE (2) DE19549107A1 (fr)
WO (1) WO1997024522A1 (fr)

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DE19607811A1 (de) * 1996-03-01 1997-09-04 Bosch Gmbh Robert Abgasrückführventil
JP3809696B2 (ja) * 1997-03-25 2006-08-16 株式会社豊田自動織機 内燃機関の排気ガス再循環装置
DE19725668C1 (de) * 1997-06-18 1998-10-29 Daimler Benz Ag Abgasrückführeinrichtung
US6223733B1 (en) * 1997-07-08 2001-05-01 Siemens Canada Limited Exhaust gas recirculation valve
US6073617A (en) * 1997-07-08 2000-06-13 Siemens Canada Ltd. Manifold-mounted emission control valve
DE10053675B4 (de) * 2000-10-28 2011-04-28 Volkswagen Ag Brennkraftmaschine mit geregelter Abgasrückführung
DE10125094A1 (de) * 2001-05-23 2002-11-28 Siemens Ag Abgasrückführeinrichtung
US6928994B2 (en) * 2001-11-08 2005-08-16 Siemens Vdo Automotive, Inc. Modular exhaust gas recirculation assembly
US6935320B2 (en) 2001-11-08 2005-08-30 Siemens Vdo Automotive Inc. Apparatus and method for exhaust gas flow management of an exhaust gas recirculation system
US7107970B2 (en) * 2002-12-18 2006-09-19 Siemens Vdo Automotive Inc. Fuel vapor purge control assembly and methods of assembling and controlling same
US6776146B1 (en) * 2003-01-27 2004-08-17 International Engine Intellectual Property Company, Llc Obstruction of flow to improve flow mix
US6907868B2 (en) * 2003-03-14 2005-06-21 Siemens Vdo Automotive, Inc. Modular exhaust gas recirculation assembly
US6848432B2 (en) * 2003-06-20 2005-02-01 Siemens Vdo Automotive, Inc. Purge control device for low vacuum condition
KR100565617B1 (ko) * 2003-09-18 2006-03-29 엘지전자 주식회사 냉장고의 제빙장치
JP4192763B2 (ja) * 2003-11-07 2008-12-10 株式会社日立製作所 電子式ｅｇｒガス制御装置
JPWO2005052347A1 (ja) * 2003-11-28 2007-06-21 株式会社日立製作所 ディーゼルエンジンのｅｇｒ制御装置およびモータ駆動式スロットル弁装置
EP1544449B1 (fr) * 2003-12-19 2007-02-21 Cooper-Standard Automotive (Deutschland) GmbH Soupape de recirculation de gaz d'échappement
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DE102004047180B4 (de) * 2004-09-29 2014-07-17 Robert Bosch Gmbh Aufladeeinrichtung mit Laststeuerung an Verbrennungskraftmaschinen
EP1869308B1 (fr) 2005-03-08 2014-08-06 BorgWarner, Inc. Soupape rge presentant une position de repos
DE102005020484A1 (de) * 2005-04-29 2006-11-02 Mahle International Gmbh Abgasrückführeinrichtung
US20080110435A1 (en) * 2006-11-13 2008-05-15 Oswald Baasch Air valve and method of use
DE102008015223B4 (de) * 2008-03-20 2010-03-25 Boa Balg- Und Kompensatoren-Technologie Gmbh Vorrichtung zur Abgasrückführung und Verfahren zu deren Herstellung
ITUA20164688A1 (it) * 2016-06-27 2017-12-27 Magneti Marelli Spa Dispositivo attuatore di valvola di ricircolo dei gas di scarico (egr) in un motore endotermico e relativo gruppo valvola di ricircolo dei gas di scarico
FR3077101B1 (fr) * 2018-01-19 2020-01-31 Renault S.A.S Dispositif d'admission d'air pour moteur a combustion interne
CN111561409B (zh) * 2020-07-14 2020-11-20 潍柴动力股份有限公司 Egr管及发动机

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Also Published As

Publication number Publication date
JPH11504411A (ja) 1999-04-20
EP0812386B1 (fr) 2000-01-05
US5785034A (en) 1998-07-28
DE19549107A1 (de) 1997-07-03
WO1997024522A1 (fr) 1997-07-10
DE59604117D1 (de) 2000-02-10
KR19980702578A (ko) 1998-07-15

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