EP0493555B1 - Soupape de melange, en quantites dosees, d'un carburant volatilise a un melange air-carburant d'un moteur a combustion interne - Google Patents

Soupape de melange, en quantites dosees, d'un carburant volatilise a un melange air-carburant d'un moteur a combustion interne Download PDF

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Publication number
EP0493555B1
EP0493555B1 EP19910912517 EP91912517A EP0493555B1 EP 0493555 B1 EP0493555 B1 EP 0493555B1 EP 19910912517 EP19910912517 EP 19910912517 EP 91912517 A EP91912517 A EP 91912517A EP 0493555 B1 EP0493555 B1 EP 0493555B1
Authority
EP
European Patent Office
Prior art keywords
valve
housing
seat
fuel
magnet
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
EP19910912517
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German (de)
English (en)
Other versions
EP0493555A1 (fr
Inventor
Siegfried Fehrenbach
Erwin Krimmer
Wolfgang Schulz
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 EP0493555A1 publication Critical patent/EP0493555A1/fr
Application granted granted Critical
Publication of EP0493555B1 publication Critical patent/EP0493555B1/fr
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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M2025/0845—Electromagnetic valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures
    • Y10T137/88054—Direct response normally closed valve limits direction of flow

Definitions

  • the invention relates to a valve for the metered admixture of fuel volatilized from the fuel tank of an internal combustion engine to a fuel / air mixture supplied to the internal combustion engine via an intake pipe of the type defined in the preamble of claim 1.
  • the fuel volatilizing in the fuel tank the so-called gasoline vapor
  • the vent port of the fuel tank is connected to a storage tank filled with activated carbon, which stores the volatilized fuel when the internal combustion engine is stopped and again when the internal combustion engine is running delivers.
  • the accumulator is connected to the intake pipe of the internal combustion engine via an intake line, where the fuel vapor is added to the fuel / air mixture.
  • tank ventilation valve defined at the outset, which is switched on in the intake line between the accumulator and the intake pipe and is opened or closed by control electronics, preferably clocked, depending on the operating state of the internal combustion engine and the exhaust gas emission measured with a lambda probe .
  • control electronics preferably clocked, depending on the operating state of the internal combustion engine and the exhaust gas emission measured with a lambda probe .
  • the seat valve integrated in the tank ventilation valve is designed to be normally closed.
  • the double function of the annular valve member, which also forms the armature of the electromagnet, enables a low movable mass of the armature and thus short switching times of the seat valve.
  • Such a stroke adjustment is realized in a known tank ventilation valve of the type mentioned at the beginning (DE 38 44 453 Al) in that the valve double seat with valve opening is formed on an intermediate ring clamped in the housing and on the side of the intermediate ring facing the inflow connection piece, a bellows with its one end face is attached, the other end face of which is attached to the bottom of a bellows enclosing the bellows with radial spacing.
  • the pot edge of the pot merges into an annular collar projecting radially over the annular valve opening, which has a number of axial bores arranged distributed in the circumferential direction, which are aligned with the valve opening in the axial direction.
  • the intermediate ring has on its side facing the pot a sealing seat which surrounds the valve opening on the inside and outside and which cooperates with the ring collar of the pot which acts as a closing member. If the vacuum at the inflow nozzle increases, the bellows contracts. The ring collar approaches the sealing seat and the flow cross section at the sealing seat becomes smaller. The limit is reached when the ring collar of the pot rests on the sealing seat. The axial bores in the ring collar then determine the remaining opening cross section of the seat valve.
  • the tank ventilation valve according to the invention with the characterizing features of claim 1 has the advantage, in comparison, of realizing a normally closed seat valve with valve member stroke largely adapted to the pressure difference upstream and downstream of the valve seat, with little manufacturing effort.
  • the valve member or the armature is drawn more strongly in the direction of the valve double seat with increasing negative pressure in the intake pipe of the internal combustion engine and thus at the outflow connection of the tank ventilation valve. This suction force counteracts the force of the electromagnet.
  • a separate valve seat support is saved, making the valve more cost-effective.
  • valve closing spring acting in the suction direction can also be dimensioned much smaller.
  • the screwed connection between the magnetic core and the magnetic housing enables simple axial displacement of the magnetic core and thus very simple adjustment of the stroke stop for the armature.
  • the annular gap nozzle is basically arranged in a recess in the yoke and the valve member or armature is guided axially displaceably with a small radial distance in the recess by means of a leaf spring held in the valve housing, preferably made of non-magnetic material. This ensures easy guidance of the anchor. The leaf spring is tolerated so that lateral tilting of the armature is prevented.
  • the volatilized fuel flowing from the inflow nozzle via the seat valve to the outflow nozzle is guided both through the hollow cylindrical magnetic core and through axial channels between the magnet housing and the valve housing.
  • a non-return valve is required, which opens towards the outflow nozzle.
  • a check valve is integrated in a simple manner in the valve housing between the valve seat and outflow connection.
  • the valve seat of the check valve is formed on the valve housing and its valve member is pressed onto the valve seat with a valve spring which is supported on the outflow connection.
  • the valve schematically shown in longitudinal section in FIG. 1 for metered admixing of fuel volatilized from the fuel tank of an internal combustion engine to a fuel-air mixture supplied to the internal combustion engine via an intake pipe, hereinafter referred to as a tank ventilation valve, is used in a dispensing system for introducing volatilized fuel into an internal combustion engine. as described in DE 35 19 292 A1.
  • the tank ventilation valve has a two-part valve housing 10 with a cup-shaped housing part 101 and a cap-shaped housing part 102 that terminates this.
  • the housing part 101 carries an inflow connection 11 for connection to a ventilation connection of the fuel tank or to a downstream, filled with activated carbon, storage for the volatilized fuel, while the housing part 102 carries an outflow connection 12 for connection to the intake pipe of the internal combustion engine.
  • Inflow connection 11 and outflow connection 12 are each arranged axially in the housing parts 101 and 102, respectively.
  • An electromagnet 13 is arranged in the interior of the pot-shaped housing part 101. It has a pot-shaped magnet housing 14 with a coaxial, hollow-cylindrical magnetic core 13 penetrating the bottom of the pot and a cylindrical excitation coil 16, which is seated on a coil carrier 17 and in the magnet housing 14 Magnetic core 15 surrounds.
  • an outwardly projecting threaded connector 18 with an internal thread 19 is integrally formed, in which an external thread section 20 is screwed onto the hollow cylindrical magnet core 15.
  • the magnetic core 15 is aligned with the inflow nozzle 11, so that the volatilized fuel flowing in here passes directly into the magnetic core 15 and flows through it.
  • the magnet housing 14 with the magnetic core 15 is inserted in the cup-shaped housing part 101 in such a way that 10 axial channels remain between the outer jacket of the magnet housing 14 and the inner jacket of the valve housing, which channels are offset from one another in the circumferential direction by the same angle.
  • axial channels 21, 22 are on the one hand via an annular space 23, which remains between the valve housing 10 and the external thread section 20 of the magnetic core 15, with the inflow connector 11 and, on the other hand, via bores 24 which are introduced into the magnet housing 14 near the open end of the magnet housing 14 , in connection with the inside of the magnet housing 14.
  • the volatilized fuel emerging from the inflow nozzle 11 also flows around the magnet housing 14 and dissipates any heat generated here.
  • the edge of the magnet housing 14 is angled outwards to form an annular support flange 25, which is bent at the end into an axially projecting annular web 26.
  • the support flange 25 serves to receive a yoke 27, which covers the magnet housing 14 and rests against the ring web 26 at the edge.
  • the yoke 27 shown enlarged in section and plan view in FIGS. 2 and 3 is seated by means of two fitting holes 28 on two retaining pins 29 in the cap-shaped housing part 102, which on the Project part 101 facing the underside axially.
  • a leaf spring 30 made of non-magnetic material, for example made of bronze, is clamped between the support flange 25 and the yoke 27, which is centered on the holding pin 29 and carries the armature of the electromagnet 13.
  • the electromagnet 13 is used for the clocked switching of a seat valve 31 which is arranged between the inflow nozzle 11 and the outflow nozzle 12.
  • the seat valve 31 has a valve double seat 32 (FIG. 2), which is arranged at the bottom of a recess 33 in the yoke 27 on the side facing the inflow nozzle 11.
  • the recess 33 is designed such that the base of the recess 33 carrying the valve double seat 32 faces the magnetic core 15.
  • the valve double seat 32 coaxially encloses an annular gap nozzle 34 on the outside and inside, which is designed as two symmetrical, semicircular arc gaps 35, 36 in the yoke 27.
  • a valve member in the form of an annular disk 37 made of magnetic material interacts with the valve double seat 22 and at the same time forms the armature of the electromagnet 13.
  • the annular disc 37 engages with a centering 38 through a circular recess 39 in the leaf spring 30 and is attached to this.
  • the annular disc 37 is dimensioned so that its axial thickness is slightly less than the inside depth of the recess 33 and its diameter is slightly smaller than the inside diameter of the recess 33, so that only between the outer circumference of the annular disc 37 and the inner shell of the recess 33 an extremely small annular gap 40 remains.
  • the leaf spring 30 is tolerated so that a lateral magnetic tilting Washer 37 is reliably prevented.
  • the annular disk 37 carries a sealing rubber 41 on its side facing the valve double seat 32.
  • the annular disk 37 with its sides covered with the sealing rubber 41 is pressed onto the valve double seat 32 by a valve closing spring 49.
  • the valve closing spring 49 is supported on the one hand on the annular disk 37 and on the other hand on an annular support shoulder 50 which is formed on the inner wall of the hollow cylindrical magnetic core 15.
  • the free end face of the magnetic core 15 forms a stop 51 for the lifting movement of the annular disk 37.
  • the stop thread 51 can be axially displaced by means of the adjusting thread formed by the internal thread 19 and the external thread section 20, and thereby the flow rate can be determined with the seat valve 31 open at the maximum.
  • valve closing spring 49 is of small dimensions since, in the event of a pressure drop between the outlet connection 12 and the inlet connection 11, the annular gap nozzle 34 exerts a suction effect on the annular disk 37 in the direction of valve firing, thus supporting the closing effect of the valve spring 49.
  • the rear side of the yoke 27 facing away from the valve double seat 32 is sealed off from the housing part 102 by a sealing ring 42, so that leakage losses via the connection of the yoke 27 and the magnet housing 14 are avoided.
  • the outflow connector 12 is snapped into an outflow connector 12 which is coaxially formed on the housing part 102.
  • a valve seat 44 of a check valve 45 is formed in the receiving socket 43 on a radially inwardly projecting annular shoulder, on which a valve body 46 is pressed by a valve spring 47.
  • the valve spring 47 is supported in an abutment 48 provided in the receiving socket 43.
  • the check valve 45 is required if the tank ventilation valve is used in so-called loader engines should.
  • the seat valve 31 When the electromagnet 13 is de-energized, the seat valve 31 is closed, since the annular disk 37 with its sealing rubber 41 is pressed onto the valve double seat 32 by the valve closing spring 49.
  • the electromagnet 13 When the internal combustion engine is operating, the electromagnet 13 is actuated in a clocked manner by control electronics. The cycle rate is predetermined by the operating state of the internal combustion engine, so that the flow rate of volatilized fuel that passes through the seat valve 31 from the inflow nozzle 11 into the outflow nozzle 12 is metered accordingly.
  • This electromagnetic actuation of the seat valve 31 is superimposed by influencing the stroke of the annular disk 37 due to the suction effect of the annular gap nozzle 34.
  • the invention is not limited to the exemplary embodiment described.
  • the centering of the leaf spring 30 can also be carried out on the yoke 27 instead of on the housing part 102 by means of pins of the same type.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

Une soupape de dégazage de réservoir permettant de mélanger, dans des quantités dosées, du carburant volatilisé au mélange air-carburant d'un moteur à combustion interne présente une cage de soupape (10) avec des tubulures d'amenée et d'évacuation (11, 12) entre lesquelles est disposée une soupape à siège (31) à commande électromagnétique chargée par ressort de fermeture de soupape (49) dans la direction de la fermeture. Pour simplifier la construction de la soupape de dégazage de réservoir, l'orifice de la soupape à siège (31) est disposé, en tant que buse à passage annulaire (34), dans la culasse de retour (27) de l'électro-aimant (13) et le siège double de soupape (32) coopérant avec l'élément soupape (37) et entourant la buse à passage annulaire (34) est disposé sur le côté de la culasse de retour (27) dirigé vers la tubulure d'amenée (11). Le noyau magnétique (15) cylindrique creux du boîtier (14) de l'aimant peut être vissé au moyen d'un filetage de réglage (19, 20) dans le boîtier (14) de l'aimant pour régler la course de l'élément soupape (37). Contre le noyau magnétique (15) vient s'appuyer un ressort (49) de fermeture de soupape qui charge l'élément soupape (37) formé par l'induit de l'électro-aimant (13) dans le sens de la fermeture.

Claims (6)

  1. Soupape pour mélanger, en quantités dosées, du carburant volatilisé en provenance du réservoir de carburant d'un moteur à combustion interne à un mélange carburant-air amené au moteur à combustion interne par l'intermédiaire d'une tubulure d'aspiration, avec un boîtier de soupape (10), qui comporte une tubulure d'arrivée (11) pour le raccordement à une tubulure d'aération du réservoir de carburant ou bien à un réservoir de charbon actif branché à la suite de cette tubulure pour le carburant volatilisé, et une tubulure de sortie (12) pour le raccordement à la tubulure d'aspiration, et avec une soupape à siège disposée à l'intérieur du boîtier de soupape entre les tubulures d'arrivée et de sortie et qui comporte un double siège de soupape (32) entourant une ouverture de soupape (34) de forme annulaire et un organe de soupape (37) de forme annulaire coopérant avec ce double siège, qui est sollicité par un ressort de fermeture de soupape (49) dans la direction de fermeture de la soupape et qui est susceptible d'être actionné dans le sens d'ouverture de la soupape par un électro-aimant (13), lequel comporte un boîtier d'électro-aimant (14) disposé coaxialement par rapport à l'ouverture de la soupape, un noyau magnétique (15) cylindrique creux disposé au milieu dans le boîtier d'électro-aimant, une bobine d'excitation (16) placée dans l'espace annulaire entre le noyau magnétique (15) et le boîtier (14) de l'électro-aimant, une culasse (27) recouvrant le boîtier (14) de l'électro-aimant et une armature (37) en un matériau magnétiquement conducteur constituant l'organe de soupape, caractérisée en ce que l'ouverture de soupape (34) est disposée sous la forme d'une buse à fente annulaire (34) dans la culasse (27) et le double siège de soupape (32) est réalisé sur le côté de la culasse (27) tourné vers la tubulure d'arrivée (11), et en ce que le noyau magnétique cylindrique creux (15) est susceptible d'être vissé dans un filetage de réglage (19, 20) prévu au fond du boîtier d'électro-aimant (14) et porte une butée (50) où le ressort (49) de fermeture de la soupape prenant appui contre l'armature (37).
  2. Soupape selon la revendication 1, caractérisée en ce que la buse à fente annulaire (34) est disposée au fond d'une cavité (33) dans la culasse (27) et l'armature (37) est guidée de façon à pouvoir se déplacer axialement dans la cavité (33) avec un jeu radial réduit.
  3. Soupape selon la revendication 2, caractérisée en ce que l'armature (37) est fixée à un ressort à lame (30) bloqué dans le boîtier de soupape (10) et ce ressort à lame (30) est conçu de façon à empêcher d'une manière fiable un coincement de l'armature (37) dans la cavité (33).
  4. Soupape selon la revendication 3, caractérisée en ce que le ressort à lame (30) est constitué d'un matériau non magnétique, par exemple un bronze de cuivre.
  5. Soupape selon une des revendications 1 à 4, caractérisée en ce qu'entre le boîtier d'électro-aimant (14) et le boîtier de soupape (10), sont prévus des canaux axiaux (21, 22) qui sont en communication d'une part avec la tubulure d'arrivée (11) et d'autre part avec l'intérieur du boîtier d'électro-aimant (14) par l'intermédiaire d'orifices de passage (24) ménagés dans le boîtier d'électroaimant (14) au voisinage de la culasse (27).
  6. Soupape selon une des revendications 1 à 5, caractérisée en ce qu'entre la tubulure de sortie (12) et le côté tourné vers elle de la culasse (27) est disposée dans le boîtier de soupape (10), une soupape de retenue (45), dont le siège de soupape (44) est ménagé sur le boîtier de soupape (10) et dont l'organe de soupape (46) est pressé sur le siège de soupape (44) par un ressort de soupape (47) prenant appui sur la tubulure de sortie (12).
EP19910912517 1990-07-20 1991-07-17 Soupape de melange, en quantites dosees, d'un carburant volatilise a un melange air-carburant d'un moteur a combustion interne Expired - Lifetime EP0493555B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19904023044 DE4023044A1 (de) 1990-07-20 1990-07-20 Ventil zum dosierten zumischen von verfluechtigtem kraftstoff zum kraftstoffluftgemisch einer brennkraftmaschine
DE4023044 1990-07-20
PCT/DE1991/000585 WO1992001862A1 (fr) 1990-07-20 1991-07-17 Soupape de melange, en quantites dosees, d'un carburant volatilise a un melange air-carburant d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0493555A1 EP0493555A1 (fr) 1992-07-08
EP0493555B1 true EP0493555B1 (fr) 1994-11-02

Family

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EP19910912517 Expired - Lifetime EP0493555B1 (fr) 1990-07-20 1991-07-17 Soupape de melange, en quantites dosees, d'un carburant volatilise a un melange air-carburant d'un moteur a combustion interne

Country Status (7)

Country Link
US (1) US5178116A (fr)
EP (1) EP0493555B1 (fr)
JP (1) JP2911600B2 (fr)
BR (1) BR9105838A (fr)
DE (2) DE4023044A1 (fr)
PL (1) PL167739B1 (fr)
WO (1) WO1992001862A1 (fr)

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US4944276A (en) * 1987-10-06 1990-07-31 Colt Industries Inc Purge valve for on board fuel vapor recovery systems
DE3830722A1 (de) * 1988-09-09 1990-03-15 Freudenberg Carl Fa Vorrichtung zum dosierten einspeisen fluechtiger kraftstoffbestandteile in das ansaugrohr einer brennkraftmaschine
DE3844453C2 (de) * 1988-12-31 1996-11-28 Bosch Gmbh Robert Ventil zum dosierten Zumischen von verflüchtigtem Kraftstoff zum Kraftstoffluftgemisch einer Brennkraftmaschine
US4951637A (en) * 1989-06-29 1990-08-28 Siemens-Bendix Automotive Electronics Limited Purge flow regulator
US5054455A (en) * 1989-12-18 1991-10-08 Siemens-Bendix Automotive Electronics Limited Regulated flow canister purge system
US5069188A (en) * 1991-02-15 1991-12-03 Siemens Automotive Limited Regulated canister purge solenoid valve having improved purging at engine idle
US5083546A (en) * 1991-02-19 1992-01-28 Lectron Products, Inc. Two-stage high flow purge valve

Also Published As

Publication number Publication date
DE59103426D1 (de) 1994-12-08
PL291113A1 (en) 1992-08-10
DE4023044A1 (de) 1992-01-23
US5178116A (en) 1993-01-12
WO1992001862A1 (fr) 1992-02-06
JP2911600B2 (ja) 1999-06-23
BR9105838A (pt) 1992-08-18
JPH05501440A (ja) 1993-03-18
EP0493555A1 (fr) 1992-07-08
PL167739B1 (pl) 1995-10-31

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