WO2014011161A1 - Soupape champignon à articulation pour sceller un dispositif de détection de fuite de vide naturelle - Google Patents

Soupape champignon à articulation pour sceller un dispositif de détection de fuite de vide naturelle Download PDF

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Publication number
WO2014011161A1
WO2014011161A1 PCT/US2012/046174 US2012046174W WO2014011161A1 WO 2014011161 A1 WO2014011161 A1 WO 2014011161A1 US 2012046174 W US2012046174 W US 2012046174W WO 2014011161 A1 WO2014011161 A1 WO 2014011161A1
Authority
WO
WIPO (PCT)
Prior art keywords
poppet
flange
stem portion
integrally formed
closed position
Prior art date
Application number
PCT/US2012/046174
Other languages
English (en)
Inventor
David William Balsdon
Kris SMITH
Peter Hueniken
Original Assignee
Continental Automotive Systems, Inc.
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 Continental Automotive Systems, Inc. filed Critical Continental Automotive Systems, Inc.
Priority to PCT/US2012/046174 priority Critical patent/WO2014011161A1/fr
Publication of WO2014011161A1 publication Critical patent/WO2014011161A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/035—Fuel tanks characterised by venting means
    • B60K15/03519—Valve arrangements in the vent line
    • 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
    • F02M25/0809—Judging failure of purge control 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
    • B60K2015/03276—Valves with membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
    • B60K2015/03282—Umbrella type valves

Definitions

  • the present invention relates generally to an articulating poppet used with a Natural Vacuum Leak Detector (NLVD) device.
  • NLVD Natural Vacuum Leak Detector
  • a known fuel system for vehicles with internal combustion engines includes a canister that accumulates fuel vapor from a headspace of a fuel tank. If there is a leak in the fuel tank, the canister, or any other component of the fuel system, fuel vapor could escape through the leak and be released into the atmosphere instead of being accumulated in the canister.
  • Various government regulatory agencies e.g., the U.S. Environmental Protection Agency and the Air Resources Board of the California Environmental Protection Agency, have promulgated standards related to limiting fuel vapor releases into the atmosphere. Thus, it is believed that there is a need to avoid releasing fuel vapors into the atmosphere, and to provide an apparatus and a method for performing a leak diagnostic, so as to comply with these standards.
  • An automotive leak detection on-board diagnostic determines if there is a leak in the vapor management system of an automobile.
  • the vapor management system can include the fuel tank headspace, the canister that collects volatile fuel vapors from the headspace, a purge valve and all associated hoses.
  • a pressure/vacuum sensor or switch allows the engine computer to monitor the vacuum that is caused by the system cooling after the engine has been turned off and thereby performs the leak detection diagnostic.
  • a vacuum relief function provides fail-safe operation of the purge flow system and guarantees that vacuum levels in the fuel tank do not endanger the integrity of the tank both with the engine on and off.
  • a pressure relief function is desired in order to "blow off” any excessive fuel vapor immediately after engine shutdown and to facilitate the desired vacuum generation.
  • Another benefit of the pressure relief function is to allow air to exit the tank at high flow rates during tank refueling. This function is commonly known as Onboard Refueling Vapor Recovery (ORVR).
  • ORVR Onboard Refueling Vapor Recovery
  • the pressure relief function is typically achieved through the use of a Natural Vacuum Leak Detector (NLVD), which includes a pressure relief valve having a poppet mounted on the end of a shaft, and a diaphragm.
  • NLVD Natural Vacuum Leak Detector
  • the NLVD functions to relieve excessive negative pressure (vacuum).
  • the poppet and shaft move to change the valve between an open and closed position.
  • the poppet and shaft contact a lip seal when the valve is in the closed position.
  • the present invention is an articulated valve for preventing leaks in a natural vacuum leak detection (NLVD) device.
  • the articulated valve includes a poppet stem portion which has a flange portion, and the flange portion has a lower surface and a support surface.
  • the flange portion and an enlarged diameter portion are integrally formed as part of the poppet stem portion, and a lower stem portion is integrally formed with the enlarged diameter portion.
  • a plurality of ribs is integrally formed on the outer surface of the lower stem portion, and a poppet pin is integrally formed with and extending away from the flange portion.
  • the articulated valve also includes a poppet portion.
  • the poppet portion includes a poppet flange selectively in contact with and supported by the flange portion, and a hollowed extension integrally formed with the poppet flange.
  • the flange portion includes a sealing surface, which contacts a seal when the articulated valve is in a closed position.
  • the poppet pin is slidably received into the hollowed extension, allowing the poppet stem portion to articulate relative to the poppet portion.
  • the movement of the flange portion is at least partially controlled by a friction spring, and a poppet spring.
  • the seal surface of the flange portion is able to move to evenly apply force to the lip seal, and provide a full seal. Because the seal surface of the flange portion is able to articulate, or wobble, the flange portion is able to compensate for misalignment between the poppet stem portion and lip seal.
  • a spherical-shaped articulating poppet is used having a spherical-shaped poppet portion, which allows for the poppet portion to articulate relative to the poppet stem portion and achieve an adequate seal between the poppet flange and the lip seal.
  • Figure 1 is a schematic of a fuel system including an
  • NVLD device having an articulating poppet, according to embodiments of the present invention
  • Figure 2 is a first sectional side view of an NVLD device having an articulating poppet, according to embodiments of the present invention
  • Figure 3 is a second sectional side view of an NVLD device having an articulating poppet, according to embodiments of the present invention
  • Figure 4 is a side view of an articulating poppet, according to embodiments of the present invention.
  • Figure 5A is a side view of a poppet stem portion, which is part of an articulating poppet, according to embodiments of the present invention.
  • Figure 5B is a side view of a poppet portion, which is part of an articulating poppet, according to embodiments of the present invention.
  • Figure 6 is a side view of an articulating poppet, where the poppet stem portion is articulated relative to the poppet portion, according to embodiments of the present invention
  • Figure 7 is a sectional side view of an alternate embodiment of an articulating poppet, according to embodiments of the present invention.
  • Figure 8 is a first perspective view of an alternate embodiment of an articulating poppet, according to embodiments of the present invention.
  • Figure 9 is a second perspective view of an alternate embodiment of an articulating poppet, according to embodiments of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • a Natural Vacuum Leak Detection (NLVD) device having an articulated poppet according to the present invention is part of a fuel system shown generally at 1 0.
  • the system 10 includes the NLVD device 12, a vacuum source 14, which in this embodiment is an intake of an engine, a purge valve 16, a charcoal canister 18, and a fuel tank 20.
  • the NLVD device 1 2 performs a plurality of functions including signaling 22 that a first predetermined pressure (vacuum) level exists in the headspace of the fuel system 10, relieving pressure 24 (also referred to as relieving excess vacuum) in the headspace of the fuel system 10 at a value below the first predetermined pressure level, and relieving pressure 26 (also referred to as pressure blow-off) in the headspace of the fuel system 10 above a second pressure level.
  • Relieving pressure 24,26 refers to the relieving pressure in the fuel vapor collection canister 18 and throughout the headspace of the fuel system 10 relative to the ambient atmospheric pressure A.
  • relieving pressure 26 allows excess pressure due to fuel vaporization to blow off, thereby facilitating the desired vacuum generation that occurs during cooling.
  • air within the fuel system 10 is released while fuel molecules are retained in the fuel vapor collection canister 1 8.
  • relieving pressure 26 allows air to exit the fuel tank 20 at high flow.
  • controllably connecting 28 the fuel vapor collection canister 18 to the ambient air A allows confirmation of the purge flow and allows confirmation of the signaling 22 performance.
  • controllably connecting 28 allows a computer for the engine to monitor the vacuum generated during cooling.
  • Figures 2-6 show an embodiment of the NVLD 12 constructed and arranged to be associated with the charcoal canister 18.
  • the NVLD 12 includes a housing 30 that can be connected to the body of the charcoal canister 18.
  • the NVLD 12 provides a configuration having an articulated poppet which improves the sealing function of the poppet, further described below.
  • a pressure operable device shown generally at 36, separates an interior chamber in the housing 30.
  • the pressure operable device 36 includes a diaphragm 38 that is operatively interconnected to a poppet or valve, shown generally at 40, separates the interior chamber of the housing 30 into a first portion 42 and a second portion 44.
  • the diaphragm 38 is surrounded by a flexible outer seal 52, which allows the diaphragm 38 (which is substantially rigid) to move and keep the first portion 42 separate from the separate portion 44A.
  • the flexible outer seal 52 is connected between an upper half 30A and a lower half 30B of the housing 30.
  • the valve includes two main parts, a plastic poppet stem portion 40A and a metal poppet portion 40B.
  • the first portion 42 is in fluid communication with the ambient atmospheric pressure through a first port 46.
  • the second portion 44 is in fluid communication with a second port 48 between housing 30 the charcoal canister 18.
  • the second portion 44 is also in fluid communication with a separate portion 44A via signal passageway 50.
  • a cinter pill 32 Disposed in the signal passageway 50 is a cinter pill 32, which is a type of filter used for filtering air passing through the signal passageway 50.
  • the force created as a result of vacuum in the separate portion 44A causes the diaphragm 38 to be displaced upwardly in Figures 2-3.
  • This displacement is opposed by a resilient element 54, e.g., a leaf spring.
  • the bias of the resilient element 54 can be adjusted by a calibrating screw 56 such that a desired level of vacuum, e.g., one inch of water, depresses a switch 58 which is electrically connected to an outlet terminal 64 thought the use of a circuit board 34.
  • a desired level of vacuum e.g., one inch of water
  • Pressure relieving 24 occurs as vacuum in the portions 44,44A increases, i.e., the pressure decreases below the calibration level for actuating the switch 58.
  • Vacuum in the charcoal canister 18 and the second portion 44 continually acts on the valve 40 inasmuch as the first portion 42 is always at or near the ambient atmospheric pressure A.
  • this vacuum overcomes the opposing force of a second resilient element 68 and displaces the valve 40 away from a lip seal 70.
  • the second resilient element 68 is disposed between a lower surface 60 of the plastic poppet stem portion 40A, and a bottom surface 62 of the second portion 44.
  • a portion of the second resilient element 68 also surrounds an enlarged diameter portion 66, which provides proper alignment for the resilient element 68.
  • the poppet stem portion 40A also includes a lower stem portion 80 integrally formed with the enlarged diameter portion 66.
  • the lower stem portion 80 is slideably disposed in a restraining tube 78, and the restraining tube 78 is integrally formed as part of the lower half 30B of the housing 30, and extends into the second portion 44.
  • the restraining tube 78 does not completely surround the lower stem portion 80, but surrounds approximately two-hundred-seventy degrees (270°) of the lower stem portion 80. This allows for a friction spring 90 to be in sliding contact with a plurality of ribs 92 formed as part of the lower stem portion 80.
  • the poppet stem portion 40A also has flange portion 82 which is integrally formed with the enlarged diameter portion 66.
  • the flange portion 82 includes the lower surface 60 and a support surface 84. Extending upwardly from the support surface 84 is a poppet pin 86, and the poppet pin 86 is slidably received into a hollowed extension 88, formed as part of the metal poppet portion 40B. Also formed as part of the metal poppet portion 40B, and surrounding the hollowed extension 88 is a poppet flange 94, which selectively contacts the lip seal 70 when the valve 40 is in the closed position.
  • the poppet stem portion 40A and metal poppet portion 40B are not rigidly connected to each other, but rather the poppet flange 94 is supported by the flange portion 82, and is selectively in contact with the support surface 84.
  • the non-rigid connection between the poppet pin 86 and the hollowed extension 88 allows for the metal poppet portion 40B to articulate relative to the poppet stem portion 40A, the function of which will be described later.
  • the poppet stem portion 40A is formed of injection molded plastic and is normally biased toward the lip seal 70 due to the force of the second resilient element 68. To minimize resonance of the valve 40, particularly during pressure relieving 24, a damping movement effect is provided.
  • the damping is created via friction between an outer surface 74 of the lower stem portion 80 of the valve 40 and an inner surface 76 of the restraining tube 78 fixed to the housing 30.
  • the friction spring 90 applies a predetermined amount of force to the lower stem portion 80 of the valve. More specifically, the friction spring 90 and the inner surface 76 of the restraining tube 78 contact the ribs 92 formed as part of the lower stem portion 80. This provides a desired amount of contact area, which along with the force applied by the friction spring 90, provides the desired amount of friction.
  • the friction force dampens the motion of the poppet stem portion 40, which has the effect of stopping resonance during the pressure relieving 24, 26.
  • Relieving pressure 26 is provided when there is a positive pressure in the second portion 44, e.g., when the tank 1 2 is being refueled.
  • the valve 40 is displaced to its open position to provide a very low restriction path for escaping air from the tank 12.
  • the signal passageway 50 communicates this positive pressure to the separate portion 44A.
  • this positive pressure displaces the diaphragm 38 downward toward the valve 40.
  • a diaphragm pin 38A transfers the displacement of the diaphragm 38 to the valve 40, thereby displacing the valve 40 to its open position with respect to the lip seal 70.
  • pressure in the charcoal canister 1 8 due to refueling is allowed to escape through the lower portion 44, past the lip seal 70, through the first portion 42, and through the second port 46.
  • Relieving pressure 26 is also useful for regulating the pressure in fuel tank 20 during any situation in which the engine is turned off. By limiting the amount of positive pressure in the fuel tank 20, the cool-down vacuum effect takes place sooner.
  • the restraining tube 78 may not be oriented to provide proper alignment between the valve 40 and the lip seal 70.
  • the non-rigid or articulating connection between the metal poppet portion 40B and the poppet stem portion 40A allows for the metal poppet portion 40B to provide a complete seal between the poppet flange 94 and the lip seal 70, completely closing the valve 40.
  • FIG. 4 An example of the articulation between the poppet stem portion 40A and the metal poppet portion 40B is shown in Figures 4 and 6.
  • the diameter of the poppet pin 86 is smaller than the inner diameter of the hollowed extension 88, which facilitates the articulation between the poppet stem portion 40A and the metal poppet portion 40B, but still allows for a full seal connection between the poppet flange 94 and the lip seal 70, as well as allowing the lower stem portion 80 to be in full sliding contact with the inner surface 76 of the restraining tube 78.
  • the poppet flange 94 is a spherical poppet flange 94, which is selectively in contact with the lip seal 70.
  • the spherical poppet flange 94 compensates for various changes in position of the poppet stem portion 40A and metal poppet portion 40B relative to the lip seal 70.
  • the poppet stem portion 40A may be located at various angles, but because of the spherically shaped spherical poppet flange 94, the spherical poppet flange 94 remains in contact with the lip seal 70 such as to form a complete seal when the valve 40 is in a closed position.
  • poppet flange 94 may be other shapes as well, and still provide an adequate sealing function with the lip seal 70.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Lift Valve (AREA)

Abstract

L'invention concerne un dispositif de détection de fuite de vide naturelle (12) pourvu d'une soupape champignon articulée (40) pour permettre l'articulation, ou l'oscillation, de la surface de scellement de la partie soupape champignon (40B) sur l'extrémité d'un axe (86) de la soupape champignon, l'axe (86) de la soupape champignon étant monté sur l'extrémité de la partie bride (82). La partie bride (82) possède un ressort de friction (90) sur lequel un ressort (68) de soupape champignon exerce une poussée. La surface de scellement de la partie bride (82) peut se déplacer de façon à appliquer de manière régulière une force sur le joint à lèvre (70) et former un joint plein. Du fait que la surface de scellement de la partie bride (82) peut s'articuler, ou osciller, la partie bride peut compenser le désalignement entre la partie tige (40A) de la soupape champignon et le joint à lèvre (70).
PCT/US2012/046174 2012-07-11 2012-07-11 Soupape champignon à articulation pour sceller un dispositif de détection de fuite de vide naturelle WO2014011161A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2012/046174 WO2014011161A1 (fr) 2012-07-11 2012-07-11 Soupape champignon à articulation pour sceller un dispositif de détection de fuite de vide naturelle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2012/046174 WO2014011161A1 (fr) 2012-07-11 2012-07-11 Soupape champignon à articulation pour sceller un dispositif de détection de fuite de vide naturelle

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WO2014011161A1 true WO2014011161A1 (fr) 2014-01-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115646856A (zh) * 2022-12-27 2023-01-31 博鼎精工智能科技(山东)有限公司 一种提升阀检测装置及其实现方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412756A (en) * 1965-08-06 1968-11-26 Int Harvester Co Poppet valve having oppositely directed spherical seating surfaces
US6470861B1 (en) * 1999-11-19 2002-10-29 Siemens Canada Limited Fluid flow through an integrated pressure management apparatus
US20050189509A1 (en) * 2004-02-27 2005-09-01 Yuri Peric Leak-resistant solenoid valves
US20090133672A1 (en) * 2007-11-27 2009-05-28 Continental Automotive Canada Inc. Natural vacuum leak detection device using diaphragm-seal mechanism
WO2012080177A1 (fr) * 2010-12-15 2012-06-21 Continental Automotive Gmbh Moteur à combustion interne comprenant un nettoyage de réservoir amélioré

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412756A (en) * 1965-08-06 1968-11-26 Int Harvester Co Poppet valve having oppositely directed spherical seating surfaces
US6470861B1 (en) * 1999-11-19 2002-10-29 Siemens Canada Limited Fluid flow through an integrated pressure management apparatus
US20050189509A1 (en) * 2004-02-27 2005-09-01 Yuri Peric Leak-resistant solenoid valves
US20090133672A1 (en) * 2007-11-27 2009-05-28 Continental Automotive Canada Inc. Natural vacuum leak detection device using diaphragm-seal mechanism
WO2012080177A1 (fr) * 2010-12-15 2012-06-21 Continental Automotive Gmbh Moteur à combustion interne comprenant un nettoyage de réservoir amélioré

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115646856A (zh) * 2022-12-27 2023-01-31 博鼎精工智能科技(山东)有限公司 一种提升阀检测装置及其实现方法

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