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WO2001031240A1 - Soupape de purge a faible bruit - Google Patents

Soupape de purge a faible bruit Download PDF

Info

Publication number
WO2001031240A1
WO2001031240A1 PCT/CA2000/001285 CA0001285W WO0131240A1 WO 2001031240 A1 WO2001031240 A1 WO 2001031240A1 CA 0001285 W CA0001285 W CA 0001285W WO 0131240 A1 WO0131240 A1 WO 0131240A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
valve assembly
actuator
configuration
seat
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.)
Ceased
Application number
PCT/CA2000/001285
Other languages
English (en)
Inventor
David W. Balsdon
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.)
Siemens Canada Ltd
Original Assignee
Siemens Canada Ltd
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 Siemens Canada Ltd filed Critical Siemens Canada Ltd
Publication of WO2001031240A1 publication Critical patent/WO2001031240A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0686—Braking, pressure equilibration, shock absorbing
    • F16K31/0696—Shock absorbing, e.g. using a dash-pot

Definitions

  • This mventton relates generally to on-board emission control systems for internal combustion engine powered motor vehicles, e g , evaporative emission control systems, and more particularly to an emission control valve, such as a canister purge solenoid (CPS) valve for an evaporative emission control system
  • an emission control valve such as a canister purge solenoid (CPS) valve for an evaporative emission control system
  • a known on-board evaporative emission control system comprises a vapor collection canister that collects fuel vapor emitted from a tank containing volatile liquid fuel for the engine, and a CPS valve for periodically purging collected vapor to an intake manifold of the engine
  • the CPS valve comprises a solenoid that is under the control of a purge control signal generated by a microprocessor-based engine management system
  • a known purge control signal is a duty-cycle modulated square-pulse waveform having a relatively low operating frequency, e g , in the 5 Hz to 20 Hz range It is believed that the modulation may range from 0% to 100% This means that for each cycle of the operating frequency, the solenoid is energized for a certain percentage of the time penod of the cycle It is believed that as this percentage increases, the time for which the solenoid is energized also increases, and therefore so does the purge flow through the valve Conversely,
  • the present invention provides a valve assembly for regulating a fluid flow
  • the valve assembly comp ⁇ ses a body having a passage extending between a first port and a second port, a seat defining a portion of the passage, a member movable with respect to the seat, an actuator moving the member from the first configuration to the second configuration, and a damper movable with respect to the actuator and located at a radial gap between the member and the actuator
  • the member moves generally along an axis between a first configuration prohibiting fluid flow through the seat and a second configuration permitting fluid flow through the seat
  • the member includes a first portion adapted to sealingly engage the seat in the first configuration, and a second portion extending along the axis between a first section that is distal from the first portion and a second section that is fixed to the first portion
  • the actuator has an aperture extending along the axis and generally receiving the second portion
  • the aperture includes a first segment generally guiding movement of the first section, and a second segment generally guiding movement of the second section
  • the present invention further provides a method of regulating a fluid flow with a valve
  • the valve includes a seat that defines a portion of a passage for the fluid flow, a valve movable along an axis with respect to the seat, and an actuator that moves the valve between a first configuration that prohibits the fluid flow through the seat and a second configuration that permits the fluid flow through the seat
  • the method comp ⁇ ses operating the actuator with a pulse-width modulated signal, and generating no more than 35 decibels of sound at an ambient temperature of approximately 20 degrees Celsius
  • Figure 1 is a schematic diagram of an evaporative emission control system including a CPS valve
  • Figure 2 is a cross-section view of a first embodiment of a CPS valve
  • Figure 3 is an illustration of magnetic flux lines in a CPS valve
  • Figure 4 is a cross-section view of a second embodiment of a CPS valve
  • Figure 5 is a cross-section view of a third embodiment of a CPS valve
  • FIG. 1 shows an evaporative emission control system 10, such as for a motor vehicle (not shown), that comp ⁇ ses a vapor collection canister 12, and a CPS valve 14 according to the present disclosure
  • the valve 14 is connected in series between a fuel tank 16 and an intake manifold 18 of an internal combustion engine 20
  • An engine management computer 22 that receives va ⁇ ous input signals supplies a purge control output signal for operating valve 14
  • the valve 14 comp ⁇ ses a body part 24 having an inlet port 25 and an outlet port 26
  • Body part 24 is fab ⁇ cated from suitable fuel-tolerant mate ⁇ al, such as by injection molding, and embodies the two ports as respective nipples
  • Body part 24 includes a formation 36 that provides for the mounting of the valve 14 at a suitable mounting location on an automotive vehicle, e g , on the vapor collection canister 12
  • the body part 24 includes a passage 27 extending between the mlet and outlet ports 25,26 A seat 28 defines a portion of the passage 27
  • Valve 14 further comp ⁇ ses a solenoid assembly 30 that is housed within body part 24
  • Solenoid assembly 30 comp ⁇ ses a polymeric bobbin 38 around whose central tubular core 40 an electromagnetic coil 42 is disposed
  • Reference numeral 44 designates an imaginary longitudinal axis of valve 14 with which core 40 and mlet port 25 are coaxial
  • Core 40 comp ⁇ ses a circular cylmd ⁇ cal aperture 46 that is open at opposite axial ends through respective radially directed annular end walls 48,50 of bobbin 38 Terminations of magnet wire that forms coil 42 are joined to respective electric terminals 52 (only one is shown) whose proximal ends are mounted in an electrical connector formation 48
  • the valve 14 is provided with an elect ⁇ c connector for making connection to a complementary connector (not shown) leading to the engine management computer 22
  • Solenoid assembly 30 further comp ⁇ ses magnetic circuit structure for concentrating magnetic flux generated by coil 40 when elect ⁇ c current is delivered to the coil 42 via terminals 52
  • the magnetic circuit structure comp ⁇ ses an armature 80, a stator 60, e g , a generally cyhnd ⁇ cal pole piece that is disposed at one end of the solenoid 30, and a flux return washer 64 that is disposed at the opposite end of the solenoid 30
  • the magnetic circuit includes a "working" axial air gap 65 between the stator 60 and the armature 80, and it also includes a "parasitic" radial gap 66 between armature 80 and the flux return washer 64
  • Armature 80 can comp ⁇ se a generally cyhnd ⁇ cal shape adapted for axial motion within aperture 46
  • One portion of the armature 80 includes an axial end section 82 that is in juxtaposition to the stator 60
  • the armature 80 also includes a valve portion 70 that sealingly engages the seat 27 The valve portion 70 moves between
  • armature 80 When acted upon by magnetic force a ⁇ sing from magnetic flux in the magnetic circuit, armature 80 will not necessa ⁇ ly move with solely an axial component of motion
  • the motion may be accompanied by a radial, or lateral, component
  • the concentration of flux lines 67 that are generally parallel to the axis 44 extend across the working air gap 65 and provide the working force that pulls the armature 80 toward the stator 60
  • the flux lines 68 which are generally perpendicular to the axis 44, extend across the parasitic air gap 66 and tend to provide the undesirable lateral pull on the armature 80
  • an impact absorbing resilient member 84 is provided at another section 86 of the armature 80
  • the illustrated impact absorbing resilient member 84 can be made of a fluorocarbon elastomer
  • a fluorocarbon elastomer One suitable mate ⁇ al that is commercially available is viny dene fluo ⁇ de/hexafluoropropylene/tetrafluoroethylene te olymers (sold as Viton GFLT by E I du Pont de Nemours & Co )
  • the end wall 50 at a lower segment of the bobbin 38 may include a projection 50a extending into the radial parasitic air gap 66
  • the projection 50a contiguously engages the impact absorbing resilient member 84 as the armature 80 is moved laterally by the magnetic flux lines 68
  • the section 82 of the armature 80 can comp ⁇ se a ferrous jacket 88 surrounding an elastomer core, which can also form the section 86 of the armature 80
  • the resilient member 84 and the core can comp ⁇ se a single homogeneous part
  • a third section 90 of the armature 80 is located between the sections 82,84
  • This third section 90 can include a reduced outside diameter portion of the ferrous jacket 88 su ⁇ oundmg the elastomer core
  • the reduce outside diameter of the third section 90 ensures that only the first section 82 of the armature 80 contacts a first segment of the aperture 46, and the resilient member 84 only contacts the projection 50a at a second segment of the aperture 46
  • the resilient member 84 with an enlarged diameter in lieu of or in addition to providing the projection 50a
  • a sp ⁇ ng 95 located in a pocket 96 formed by the stator 60 and the core 40 provides a return force to bias the armature 80 to its normal, I e , closed configuration, position when the coil 42 is not energized
  • the delivery of a purge control signal to valve 14 creates elect ⁇ c cu ⁇ ent flow in coil
  • a resilient element 84' can be alternatively formed as a band that surrounds the second section 86 of the armature 80
  • the resilient element 84' can be seated in a groove (not shown) that is formed on the exte ⁇ or surface of the ferrous jacket 88
  • the resilient element 84' is positioned to be the first part of the armature 80 to contact the core 40, as the armature 80 is drawn laterally
  • the resilient elements 84,84' act to dampen impacts between the armature 80 and the sides of the core 40 It is believed that by dampening these impacts, the noise level produced by the valve 14 du ⁇ ng operation can be reduced In tests, the noise level was reduced from 61 7 decibels to 39 decibels (at -20° Celsius)
  • a viscous fluid 100 can additionally or alternatively be placed in the radial gap defined by the pocket 96 and in the axial gap between the armature 80 and the stator 60
  • suitable viscous fluids include NYGEL 760G manufactured by NYE lub ⁇ cants and Loctite Lub ⁇ cant
  • a synthetic fluid, such as the Loctite Lub ⁇ cant is preferable for long-term exposure to petroleum vapors
  • the viscous fluid 100 allows the armature 80 to travel freely mside the aperture 46
  • the viscous fluid 100 also acts to dampen impacts between the armature 80 and the sides of the core 40, and between the armature 80 and the stator 60 It is believed that by dampening these impacts, the noise level produced by the valve 14 du ⁇ ng operation can be reduced In tests, the noise level was reduced from 61 7 decibels to 39 decibels (at -20° Celsius) and was reduced from 53 decibels to 32 9 decibels (at +20° Celsius) The background noise du ⁇ ng these tests was

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

Ensemble soupape et procédé de régulation de l'écoulement d'un fluide et d'atténuation du bruit. L'ensemble soupape comprend un corps présentant un passage s'étendant entre un premier orifice (25) et un second orifice (26), un siège (27) définissant une partie du passage, un élément (80) mobile par rapport au siège, un actionneur (42) déplaçant l'élément depuis la première configuration jusqu'à la seconde configuration, et un amortisseur (84) mobile par rapport à l'actionneur est situé au niveau d'un espace radial entre l'élément et l'actionneur. L'élément évolue, d'une manière générale, le long d'un axe entre une première configuration empêchant l'écoulement de fluide à travers le siège et une seconde configuration permettant l'écoulement du fluide à travers le siège. L'élément présente une première portion adaptée pour venir en contact hermétique avec le siège dans la première configuration, et une seconde portion s'étendant le long de l'axe, entre une première partie distale de la première portion et une seconde partie fixée sur la première portion. L'actionneur présente une ouverture s'étendant le long de l'axe et recevant, d'une manière générale, la seconde portion. L'ouverture comprend un premier segment guidant, d'une manière générale, le mouvement de la première partie, et un second segment guidant, d'une manière générale, le mouvement de la seconde partie.
PCT/CA2000/001285 1999-10-28 2000-10-30 Soupape de purge a faible bruit Ceased WO2001031240A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16195699P 1999-10-28 1999-10-28
US60/161,956 1999-10-28

Publications (1)

Publication Number Publication Date
WO2001031240A1 true WO2001031240A1 (fr) 2001-05-03

Family

ID=22583537

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2000/001285 Ceased WO2001031240A1 (fr) 1999-10-28 2000-10-30 Soupape de purge a faible bruit

Country Status (1)

Country Link
WO (1) WO2001031240A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112017004192T5 (de) 2016-08-24 2019-08-22 Padmini Vna Mechatronics Pvt. Ltd. Neuartige Dichtplattenanordnung für Turbodoppelentlüftungsventil

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1169242B (de) * 1961-05-10 1964-04-30 Christian Buerkert Magnetventil fuer Wechselstrombetrieb mit schlag- und geraeuschdaempfenden Mitteln
CH426413A (de) * 1963-10-05 1966-12-15 Danfoss As Magnetventil
GB1213925A (en) * 1968-05-31 1970-11-25 Automatic Switch Co Solenoid operator having armature provided with guide ring
US4449691A (en) * 1981-08-17 1984-05-22 Fuehrer Egon Electromagnet
US5503366A (en) * 1993-03-25 1996-04-02 Firma Carl Freudenberg Electromagnetically actuated valve
US5524593A (en) * 1993-09-01 1996-06-11 Pierburg Gmbh Electropneumatic control valve
FR2773865A1 (fr) * 1998-01-21 1999-07-23 Theobald A Vanne de reglage de debit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1169242B (de) * 1961-05-10 1964-04-30 Christian Buerkert Magnetventil fuer Wechselstrombetrieb mit schlag- und geraeuschdaempfenden Mitteln
CH426413A (de) * 1963-10-05 1966-12-15 Danfoss As Magnetventil
GB1213925A (en) * 1968-05-31 1970-11-25 Automatic Switch Co Solenoid operator having armature provided with guide ring
US4449691A (en) * 1981-08-17 1984-05-22 Fuehrer Egon Electromagnet
US5503366A (en) * 1993-03-25 1996-04-02 Firma Carl Freudenberg Electromagnetically actuated valve
US5524593A (en) * 1993-09-01 1996-06-11 Pierburg Gmbh Electropneumatic control valve
FR2773865A1 (fr) * 1998-01-21 1999-07-23 Theobald A Vanne de reglage de debit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112017004192T5 (de) 2016-08-24 2019-08-22 Padmini Vna Mechatronics Pvt. Ltd. Neuartige Dichtplattenanordnung für Turbodoppelentlüftungsventil
DE112017004192B4 (de) 2016-08-24 2024-07-04 Padmini Vna Mechatronics Pvt. Ltd. Neuartige Dichtplattenanordnung für Turbodoppelentlüftungsventil

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