EP0918925B1 - Ventil für verbrennungsmotor-abgasrückführungssystem - Google Patents

Ventil für verbrennungsmotor-abgasrückführungssystem Download PDF

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Publication number
EP0918925B1
EP0918925B1 EP97924094A EP97924094A EP0918925B1 EP 0918925 B1 EP0918925 B1 EP 0918925B1 EP 97924094 A EP97924094 A EP 97924094A EP 97924094 A EP97924094 A EP 97924094A EP 0918925 B1 EP0918925 B1 EP 0918925B1
Authority
EP
European Patent Office
Prior art keywords
valve
closure member
actuation means
control gate
gate according
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.)
Expired - Lifetime
Application number
EP97924094A
Other languages
English (en)
French (fr)
Other versions
EP0918925A1 (de
Inventor
Francis Peth
Laurent Coste
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.)
Sagem SA
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Publication of EP0918925A1 publication Critical patent/EP0918925A1/de
Application granted granted Critical
Publication of EP0918925B1 publication Critical patent/EP0918925B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M26/52—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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves

Definitions

  • the present invention relates to a quantity control valve exhaust gas recycled into a gas recirculation system exhaust from an internal combustion engine.
  • EGR exhaust gas recirculation systems
  • valve of the type comprising a disc. mobile in rotation and provided with a light cooperating with a fixed orifice, and motor means for driving this disk in rotation, in particular a step-by-step engine.
  • the present invention aims to overcome these drawbacks.
  • the effort of applying one organ to the other is therefore provided at least partially or entirely by the magnet.
  • the shutter member can be a flap mounted in said duct. on the axis of rotation of the rotary actuating means.
  • the walls of said conduit can form two shoulders of opposite directions on either side of the axis of the flap, said shoulders forming stop members and cooperating with the edges of the flap to provide sealing.
  • the shutter member is driven by said rotary actuating means via a cam.
  • This embodiment has the advantage that one can choose as desired the stroke of the shutter member as a function of that actuation means.
  • the shutter member can be a valve arranged to be driven in translation by said means rotary actuation through said cam.
  • Said cam may comprise a first part which is substantially cylindrical secured to the shutter member and blocked in rotation, on which are formed helical grooves arranged to cooperate with balls arranged in cells of a second piece integral with rotary actuation means and locked in translation.
  • said cam comprises a first part secured to the rotary actuating means, on which are formed by helical grooves arranged to cooperate with rollers mounted on a second part locked in rotation and secured to the member shutter.
  • the valve according to the invention includes a helical ramp coaxial with the output shaft of the means rotary actuation and driven in rotation by said means actuator, arranged to cooperate with a cam follower roller likely to cause the shutter member.
  • the valve of Figures 1 and 2 essentially comprises a motor 1 of a type which will be described below and, mounted on the output shaft of this motor, a shutter 2.
  • the shutter 2 pivots in a conduit shown schematically by the broken lines 3, this duct being connected to the valve by the flange 4 in which the flap 2 is pivotally mounted.
  • the flap 2 is capable of rotating a quarter turn between a completely open, where it is parallel to conduit 3, and a fully closed position, where it is perpendicular to this conduit and resting on abutment surfaces 5 formed in the flange 4.
  • the abutment surfaces 5 are perpendicular to the axis of the conduit 3 and are directed one in one direction, and the other in the opposite direction, so that the edges of the flap 2 are supported on these two surfaces 5 when closed, thus forming a seal. The following will be described how the force of the shutter is supplied on the abutment surfaces.
  • the gas pipe is formed of a first cylindrical conduit 10 of relatively large section, into which a second substantially cylindrical conduit 11 opens, of smaller diameter and whose axis is substantially perpendicular to the axis of the cylinder 10.
  • the two conduits are here made in one piece.
  • the end 12 of the conduit 11 inside the cylinder 10 supports a seat of valve 13 to form a seal with a valve head 14.
  • the part formed by cylinders 10 and 11 extends opposite of cylinder 11 by a housing 15 opening into cylinder 10 for receive the actuation mechanism of the valve 14.
  • the housing 15 is itself extended by a housing 16 capable of receiving the engine actuating the aforementioned mechanism, this motor not being shown in but being of the type described below.
  • a bell 17 is mounted integral with the motor output shaft and is therefore locked axially.
  • This bell 17 has holes 18 likely to receive balls 19. Consequently, the motor drives the balls 19 rotating in a plane perpendicular to the axis of this engine.
  • the balls 19 are also engaged in helical tracks 20 of a member 21 substantially cylindrical and locked in rotation. This blockage in rotation is obtained by balls 22 engaged in cells of a fixed guide member 23, these balls 22 cooperating with grooves 23 ' arranged parallel to the axis of the cylindrical part 21 in a surface interior 24 of this room.
  • the part 21 also includes an inner sleeve 25 in which is fixed the rod 26 of the valve 14 after this rod has passed through the guide piece 23.
  • the tracks 20 may of course not be helical in the sense strict mathematics of the term, so that the valve lift is not necessarily proportional to the angle of rotation of the motor, but can be adjusted at will by an appropriate conformation of the tracks.
  • the valve of Figures 5 and 6 is also a globe valve.
  • the valve actuation mechanism is here housed in a housing substantially cylindrical 30 and is actuated by a motor 31, the operation will be described below.
  • the actual valve 32 is arranged to cooperate with a valve seat 33 arranged at the end a tubular conduit 34 formed in the axial extension of the housing 30.
  • the tubular conduit 34 is arranged to be engaged in a first bore 35 of a support piece 36.
  • This tubular conduit 34 comprises, by elsewhere, a lateral orifice 37 disposed opposite a second bore 38 formed in the part 36 with its axis perpendicular to that of the first bore 35.
  • Valve 32 therefore controls the flow of fluid into bores 35 and 38.
  • the rod 39 of the valve 32 is guided by a guide member 40 mounted in the housing 30.
  • This rod has its free end comprising a shoulder 41 arranged to receive one end of a helical spring 42 the other end of which bears on the bottom 43 of the housing 30.
  • the end of the rod 39 forms another shoulder 44 oriented towards the valve 32 opposite the shoulder 41.
  • This shoulder 44 cooperates with cam surfaces 45 of a cam 46 mounted on the output shaft 47 of the motor 31.
  • valve 32 to lift seat 33.
  • the particular shape of the cam surfaces 45 makes it possible to determine the axial stroke of valve 32 as a function of the angle of rotation of the engine and, consequently, to regulate the passage of gas by function of this angle.
  • Figure 7 illustrates the characteristic curves of these motors, the torque being represented as a function of the angular elongation for a certain number of average intensities.
  • this motor provides constant torque over a certain angular range ⁇ 1 , ⁇ 2 for a given value of the intensity. More particularly, this torque is zero for a zero current and increases as a function of the intensity which traverses the control winding.
  • the equilibrium points ⁇ 3 and ⁇ 4 correspond to the case where the poles of the magnets are interposed with those of the windings at equal distance from each other.
  • the indifferent equilibrium range ⁇ 1 , ⁇ 2 corresponds to the case where these poles overlap at least partially.
  • the stator of the motor is calibrated relative to the structure of the valve so that, in the absence of current in the control winding, that is to say for an RCO equal to 1, the torque applying the flap 2 to its stops 5 or the valves 14, 32 on their seats 13, 33 either maximum or close to its maximum, as for example with a respective setting equal to ⁇ 5 or ⁇ 6 .
  • Maximum sealing is thus obtained without supplying any current. It is observed that, on the other hand, it will be necessary to provide a certain minimum intensity for detaching the flap or the valve from its seat, for example a current I 1 for an initial setting of ⁇ 6 while not taking into account the force exerted on the origin by spring
  • FIGS 8 to 11 show variants of the embodiment Figures 3 and 4, in which an engine of the same type as described above is used.
  • the rotation stop of member 121 (homologous to member 21 of FIGS. 3 and 4) is obtained not not using balls, but using fingers 122 secured to the fixed guide 123 and passing through member 121. This crossing is effected by 124 oblong holes radially elongated to avoid hyperstatism which risk causing jamming of the organ 121.
  • the drive in rotation is obtained by balls 219 cooperating with helical tracks 220, as before.
  • a sealing bell 125 is mounted integral with the valve to cooperate with the guide member 123 and prevent a gas rise along the valve stem.
  • This arrangement has the advantage of avoiding the use of balls, relatively difficult to assemble, and can cause jamming due to components of radial forces which they induce.
  • a helical ramp 301 coaxial with the motor shaft is rotated by this motor.
  • This ramp is arranged to push a roller 302 integral with the rod 303 of the valve 304, against the action of a spring 305.
  • the ramp could also be double acting, and therefore positively drive the valve in both meaning.
  • valve is mounted in the opposite direction to the embodiments precedents.
  • the casing therefore has a mounting hole, closed by a cap 306.
  • the opening and closing of the valve is produced by a motor rotary.
  • This motor is here such that in the absence of control current, the valve is kept closed by residual magnetic forces.

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)
  • Valve Device For Special Equipments (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Magnetically Actuated Valves (AREA)

Claims (10)

  1. Kontrollventil für die in einem Rückführsystem der Auspuffgase eines Verbrennungsmotors recycelten Abgasmenge mit einem Verschlussorgan (2; 14; 32), das in einem Rohr (3; 10; 11; 35; 38) angeordnet ist, um in geschlossener Position deutlich abdichtend mit einem Anschlagorgan (5; 13; 33) und rotierenden Betätigungsmitteln zusammenzuwirken, um besagtes Verschlussorgan von seiner geschlossenen Position in eine geöffnete Position anzutreiben, wobei besagte rotierende Betätigungsmittel einen Stator und einen Rotor umfassen, die wenigstens mit einem Magneten und der andere wenigstens mit einer Steuerwicklung versehen sind, gekennzeichnet durch die Tatsache, dass der Stator und der Rotor derart angebracht sind, dass bei Fehlen des Stroms in der Steuerwicklung das Verschlussorgan durch die magnetischen Restkräfte auf das Anschlagorgan gedrückt werden.
  2. Kontrollventil gemäß Anspruch 1, in dem das Verschlussorgan direkt durch besagte rotierende Betätigungsmittel angetrieben wird.
  3. Kontrollventil gemäß Anspruch 2, in dem das Verschlussorgan ein Flügel (2) ist, der in besagtem Rohr auf der Rotationsachse der rotierenden Betätigungsmittel angebracht ist.
  4. Kontrollventil gemäß Anspruch 3, in dem die Wände besagten Rohrs zwei Ansätze (5) jeweils gegenüberliegender Richtungen der Achse des Flügels bilden, wobei besagte Ansätze Anschlagorgane bilden und mit den Rändern des Flügels zur Bildung der Dichtigkeit zusammenwirken.
  5. Kontrollventil gemäß Anspruch 1, in dem das Verschlussorgan durch besagte rotierende Betätigungsmittel über eine Nocke (17; 21; 45; 46) angetrieben wird.
  6. Kontrollventil gemäß Anspruch 5, in dem das Verschlussorgan ein Ventil ist (14; 32), das angeordnet ist, um in Parallelverschiebung durch besagte rotierende Betätigungsmittel über besagte Nocke angetrieben zu werden.
  7. Kontrollventil gemäß Anspruch 5 und 6, in dem besagte Nocke ein erstes Stück (21; 121) umfasst, das deutlich zylindrisch fest mit dem Verschlussorgan verbunden und in Rotation blockiert ist, auf dem spiralförmige Rillen (20; 120) gebildet werden, um mit Kugeln (19; 119) zusammenzuwirken, die in Zellen eines zweiten Stücks (17) angeordnet sind, das mit den rotierenden Betätigungsmitteln fest verbunden und in Parallelverschiebung blockiert ist.
  8. Kontrollventil gemäß Anspruch 6, in dem besagte Nocke am Ende eines auf der Rotationsachse der Antriebsmittel angebrachten Hebels (46) gebildet wird und mit einem Ansatz (44) des Stifts des Ventils zusammenwirkt.
  9. Kontrollventil gemäß Anspruch 5 und 6, in dem besagte Nocke ein erstes, mit den rotierenden Betätigungsmitteln fest verbundenes Stück (221) umfasst, auf dem spiralförmige Rillen (220) gebildet werden, die angeordnet sind, um mit den Rollen zusammenzuwirken, die auf einem zweiten, in Rotation blockierten und mit dem Verschlussorgan fest verbundenen Stück angebracht sind.
  10. Kontrollventil gemäß Anspruch 5 und 6 mit einer zur Ausgangswelle der rotierenden Betätigungsmittel koaxialen und von besagten Betätigungsmitteln in Rotation angetriebenen spiralförmigen Rampe (301), die angeordnet ist, um mit einer Rolle zusammenzuwirken, die der Nocke (302) folgt, die geeignet ist, das Verschlussorgan anzutreiben.
EP97924094A 1996-05-14 1997-05-14 Ventil für verbrennungsmotor-abgasrückführungssystem Expired - Lifetime EP0918925B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9605974A FR2748780B1 (fr) 1996-05-14 1996-05-14 Vanne pour systeme de recirculation des gaz d'echappement de moteur a combustion interne
FR9605974 1996-05-14
PCT/FR1997/000856 WO1997043538A1 (fr) 1996-05-14 1997-05-14 Vanne pour systeme de recirculation des gaz d'echappement de moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0918925A1 EP0918925A1 (de) 1999-06-02
EP0918925B1 true EP0918925B1 (de) 2002-04-03

Family

ID=9492108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97924094A Expired - Lifetime EP0918925B1 (de) 1996-05-14 1997-05-14 Ventil für verbrennungsmotor-abgasrückführungssystem

Country Status (6)

Country Link
EP (1) EP0918925B1 (de)
AT (1) ATE215671T1 (de)
AU (1) AU2967197A (de)
DE (1) DE69711639T2 (de)
FR (1) FR2748780B1 (de)
WO (1) WO1997043538A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2772429B1 (fr) 1997-12-16 2000-06-02 Sagem Vanne de controle pour systeme de recirculation des gaz d'echappement d'un moteur a combustion interne
DE19854461C1 (de) 1998-11-25 2000-03-09 Daimler Chrysler Ag Verbrennungsmotor, insbesondere Verbrennungsmotor für Fahrzeuge, mit einer Abgasrückführung
DE19961756C1 (de) * 1999-12-21 2001-04-19 Siebe Automotive Deutschland Gmbh Abgasrückführventil
US7086636B2 (en) 2002-07-02 2006-08-08 Borgwarner Inc. Gaseous fluid metering valve
ATE394618T1 (de) * 2006-04-18 2008-05-15 Delphi Tech Inc Abgasrückführventil für eine brennkraftmaschine
DE102011119139A1 (de) * 2011-11-23 2013-05-23 Gustav Wahler Gmbh U. Co. Kg Ventil, insbesondere Niederdruckventil, zur Steuerung einer Abgasrückführung
FR3040746B1 (fr) * 2015-09-04 2019-05-03 Valeo Systemes De Controle Moteur Dispositif d'actionnement pour moteur a combustion

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6228068U (de) * 1985-08-06 1987-02-20
US4782811A (en) * 1987-03-30 1988-11-08 Robertshaw Controls Company Exhaust gas recirculation valve construction and method of making the same
JPH07301155A (ja) * 1994-05-02 1995-11-14 Honda Motor Co Ltd 電動ｅｇｒバルブ装置
JPH084632A (ja) * 1994-06-10 1996-01-09 Hitachi Ltd 流量制御装置

Also Published As

Publication number Publication date
EP0918925A1 (de) 1999-06-02
WO1997043538A1 (fr) 1997-11-20
AU2967197A (en) 1997-12-05
ATE215671T1 (de) 2002-04-15
FR2748780B1 (fr) 1998-08-14
DE69711639T2 (de) 2002-10-31
FR2748780A1 (fr) 1997-11-21
DE69711639D1 (de) 2002-05-08

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