WO2021044394A1 - Soupape d'isolement de réservoir de carburant améliorée avec moteur pas à pas intégré à conception de soupape en soupape - Google Patents

Soupape d'isolement de réservoir de carburant améliorée avec moteur pas à pas intégré à conception de soupape en soupape Download PDF

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Publication number
WO2021044394A1
WO2021044394A1 PCT/IB2020/058489 IB2020058489W WO2021044394A1 WO 2021044394 A1 WO2021044394 A1 WO 2021044394A1 IB 2020058489 W IB2020058489 W IB 2020058489W WO 2021044394 A1 WO2021044394 A1 WO 2021044394A1
Authority
WO
WIPO (PCT)
Prior art keywords
function
seal
fuel tank
ovr
stepper motor
Prior art date
Application number
PCT/IB2020/058489
Other languages
English (en)
Inventor
Kabir BHANDARI
Amardip KUMAR
Varun Kumar
Sahil Singla
Original Assignee
Padmini Vna Mechatronics Pvt. 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 Padmini Vna Mechatronics Pvt. Ltd. filed Critical Padmini Vna Mechatronics Pvt. Ltd.
Priority to CN202080045786.2A priority Critical patent/CN114502408A/zh
Publication of WO2021044394A1 publication Critical patent/WO2021044394A1/fr

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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
    • F02M25/0836—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
    • B60K2015/03296—Pressure regulating valves
    • 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
    • B60K2015/0358—Fuel tanks characterised by venting means the venting is actuated by specific signals or positions of particular parts
    • B60K2015/03585—Fuel tanks characterised by venting means the venting is actuated by specific signals or positions of particular parts by gas pressure
    • 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

Definitions

  • the present invention relates to an improved fuel tank isolation valve. More particularly, the present invention relates to an improved two stage fuel tank isolation valve integrated with a stepper motor for plunger movement and integrated function of over pressure relief, over vacuum relief and two stage controlling of flow resistance function.
  • Hybrid cars run most of the times with the electrical power and the combustion engine is idle. Since fuel tank is a closed system, thus in general due to evaporation of stored fuel it results in positive pressure inside the fuel tank. Moreover, it is necessary for vehicles to maintain an elevated pressure in the fuel tank to suppress the rate of fuel vapor generation and to minimize hydrocarbon emissions to the atmosphere.
  • the most obvious solution, to overcome the problem is to provide a fuel tank isolation valve (FTIV) coupled to fuel tank to control fuel tank venting.
  • the fuel tank isolation valve (FTIV) may be located in a conduit between a fuel tank and a fuel vapor canister in an evaporative emission control system. It opens automatically when the pressure exceeds protection limits and valve is electrically actuated at the time of refueling.
  • the fuel tank isolation valve also enables fuel vapor containment in the fuel tank until conditions are inappropriate for the engine to process the excess vapor.
  • the fuel tank isolation valve includes an electrically controlled solenoid valve to open and close the inlet and outlet port with either less precise control on opening of intermediate positions or no control of opening on intermediate positions. Thus, have no precise control of flow of fuel vapors from fuel tank to canister at the time of refueling.
  • US20020088441A1 discloses a system and method for controlling evaporative emissions of a volatile fuel.
  • the system preferably has a fuel vapor collection canister, a purge valve, an isolation valve and a fuel tank.
  • the isolation valve includes a housing, a valve body, and a seal.
  • the housing has a first port in fluid communication with the supply port of the fuel vapor collection canister, a second port, and a fuel vapor flow path that extends between the first and second ports.
  • the valve body is movable with respect to the housing along an axis between a first configuration and a second configuration. The first configuration permits substantially unrestricted fuel vapor flow between the first and second ports, and the second configuration substantially prevents fuel vapor flow between the first and second ports.
  • the fuel tank is in fluid communication with the second port of the isolation valve.
  • the main drawback of the present invention is that in this system the fuel tank isolation valve is controlled by an electrical actuator such as solenoid valve, which is a typical component and it provides predefined open and close settings as well as costly. Also controlling the solenoid valve is difficult.
  • the present invention overcomes the drawbacks of the cited art and provides an improved fuel tank isolation valve with integration of a stepper motor working as an actuator. This will lead to compact design, precise functional control, cost effective, less weight and reduced number of components in the overall assembly.
  • the main object of the present invention is to provide an improved two stage fuel tank isolation valve integrated with a stepper motor for plunger movement and integrated function of over pressure relief, over vacuum relief and two stage controlling of flow resistance function.
  • Another object of the present invention is to provide an improved two stage fuel tank isolation valve integrated with stepper motor to maintain pressure within a protected pressure range, provide two stage electric control of fuel vapors with multiple steps opening precisely controlled flow from tank to canister during refueling, provide over pressure relief and over vacuum relief.
  • Still another object of the present invention is to provide a two-stage fuel tank isolation valve which is light in weight and has reduced size.
  • the present invention provides an improved two stage fuel tank isolation valve integrated with stepper motor to maintain pressure within a protected pressure range, provide two stage electric control of fuel vapors with multiple steps opening flow from tank to canister during refueling, provide over pressure relief and over vacuum relief.
  • an improved two stage fuel tank isolation valve comprises of a valve housing and a motor housing, wherein the valve housing has a canister port, a tank port and is fitted over the motor housing, the valve housing includes a compression spring for OPR function fixed inside the valve housing for performing OPR function, a seal sub assembly for OPR function, a sealing surface for OPR function, a seal sub assembly for OVR & refueling function, a seal for OVR function, a nozzle, a first compression spring for OVR function, a sealing surface for OVR function, a stopper bush, a second compression spring for refueling function, a sealing surface for refueling function and a plunger; and the motor housing includes a stepper motor, a stepper motor rotor having an axial threaded cavity, a cover, and a plurality of ball bearings between an annular cavity between motor housing and stepper motor rotor for reducing friction when stepper motor rotor is in working condition.
  • the plunger at its bottom end
  • the improved fuel tank isolation valve integrated with stepper motor maintains pressure within a protected pressure range, provide electric control of fuel vapors flow from fuel tank to canister during refueling, provide over pressure relief and over vacuum relief.
  • the present invention provides an improved two stage fuel tank isolation valve having two separate assembly for OPR and OVR function each wherein the assembly for OPR function having a compression spring, a seal sub assembly is attached on a sealing surface apart from the assembly for OVR function.
  • the assembly for OVR function utilizes first compression spring and both first & second compression springs are used for refueling function.
  • the present invention provides a light weighted improved two stage fuel tank isolation valve having reduced size which is efficient in precisely controlling the flow in multiple steps using a stepper motor.
  • Fig. 1(a) is a perspective view of the two-stage fuel tank isolation valve in accordance with the present invention.
  • Fig. 1(b) is an exploded view of the two-stage fuel tank isolation valve in accordance with the present invention.
  • Fig. 2(a) is a sectional view of the two-stage fuel tank isolation valve in accordance with the present invention.
  • Fig. 2(b) is an enlarged sectional view of the two-stage fuel tank isolation valve in accordance with the present invention.
  • Figs. 3(a) and 3(b) is a sectional and enlarged sectional view of the two-stage fuel tank isolation valve in idle condition in accordance with the present invention.
  • Figs. 4(a) is a sectional view of the fuel tank isolation valve during refueling in accordance with the present invention.
  • Figs. 4(b) - 4(e) are enlarged sectional view of the two-stage fuel tank isolation valve during refueling in accordance with the present invention.
  • Fig. 5(a) is sectional view of the two-stage fuel tank isolation valve working in OPR condition in accordance with the present invention.
  • Figs. 5(b) and5(c) are enlarged sectional view of the two-stage fuel tank isolation valve working in OPR condition in accordance with the present invention.
  • Fig. 6(a) is sectional view of the two-stage fuel tank isolation valve working in OVR condition in accordance with the present invention.
  • Figs. 6(b) and 6(c) are enlarged sectional view of the two-stage fuel tank isolation valve working in OVR condition in accordance with the present invention.
  • the present invention provides an improved two stage fuel tank isolation valve integrated with stepper motor to maintain pressure within a protected pressure range, provide two stage electric control of fuel vapors with multiple steps opening precisely controlled flow from tank to canister during refueling, provide over pressure relief and over vacuum relief.
  • an improved two stage fuel tank isolation valve comprises of a valve housing and a motor housing, wherein the valve housing has a canister port, a tank port and is fitted over the motor housing, the valve housing includes a compression spring for OPR function fixed inside the valve housing for performing OPR function, a seal sub assembly for OPR function, a sealing surface for OPR function, a seal sub assembly for OVR & refueling function, a seal for OVR function, a nozzle, a first compression spring for OVR function, a sealing surface for OVR function, a stopper bush, a second compression spring for refueling function, a sealing surface for refueling function and a plunger; and the motor housing includes a stepper motor, a stepper motor rotor having an axial threaded cavity, a cover, and a plurality of ball bearings between an annular cavity between motor housing and stepper motor rotor for reducing friction when stepper motor rotor is in working condition.
  • the plunger at its bottom end is threaded and screwed in the threaded cavity of the stepper motor rotor.
  • the improved fuel tank isolation valve integrated with stepper motor maintains pressure within a protected pressure range, provide electric control of fuel vapors flow from fuel tank to canister during refueling, provide over pressure relief and over vacuum relief.
  • the present invention provides an improved two stage fuel tank isolation valve having two separate assembly for OPR and OVR function each wherein the assembly for OPR function having a compression spring, a seal subs assembly is attached on a sealing surface apart from the assembly for OVR function.
  • the assembly for OVR function utilizes first compression spring and both first & second compression springs are used for refueling function.
  • the present invention provides a light weighted improved two stage fuel tank isolation valve having reduced size which is efficient in precisely controlling the flow in multiple steps using a stepper motor.
  • the two-stage fuel tank isolation valve (10) comprises of a valve housing (11) fitted over a motor housing (12), wherein the valve housing comprises of a canister port (13) and a tank port (14) and the motor housing (12) has an electrical connection port (15).
  • the two-stage fuel tank isolation valve (10) comprises of a canister port (13) fitted over a compression spring (4) for OPR function mounted on a first seal subassembly (5) for OPR function.
  • a tank port (14) is positioned below the first seal sub assembly (5) for OPR function to connect to tank.
  • a second seal subassembly (2) for OVR function is provided and is mounted over a seal (3) for OVR function.
  • a first compression spring (1) is positioned below and surrounding the seal (3) for OVR function, a stopper bush (18) surrounding the first compression spring (1), a second compression spring (19) fitted below the stopper bush (18) in a spring holder (29).
  • a plunger (7) at the bottom end has threads corresponding to threads provided in the cavity of the stepper motor rotor (21) (not shown) of the stepper motor constituted by motor housing (12) and rotor (21).
  • a sectional view of the two-stage fuel tank isolation valve (10) in accordance with the present invention is shown.
  • the two stage fuel tank isolation valve (10) there is a compression spring (4) for OPR function mounted on a seal sub assembly (5) for OPR function which is in contact with a sealing surface (9), a nozzle (16), a seal sub assembly (2) for OVR function & refueling function mounted over a seal (3) for OVR function having an annular flange at top end which gets fitted to the seal sub assembly (2) for OVR function and a cavity with inward projection at the bottom end to attach and hold a plunger (7), a first compression spring (1) positioned below and surrounding the seal (3) for OVR function, a stopper bush (18) surrounding the first compression spring (1) & assembled with seal sub assembly (2) after insertion of seal (3), a second compression spring (19) fitted below the seal sub assembly (2) and above a spring holder (29), a plunger (7) at the top end passing through the spring holder (29) is fitted into the in
  • the plunger (7) has a flange portion that gets fitted into the seal (3) for OVR function and at the bottom end the plunger (7) has threads corresponding to threads provided in the cavity of the stepper motor rotor (21).
  • FIG. 2(b) an enlarged sectional view of the two-stage fuel tank isolation valve (10) in accordance with the present invention is shown.
  • Seal Sub Assembly (5) is in contact with sealing surface (9) to provide sealing for OPR function.
  • the seal sub assembly (2) for OVR function is in contact with seal (3) for OVR function to provide a first sealing for OVR and refueling function. Further, the seal sub assembly (2) for OVR function is in contact with sealing surface (24) to provide a second sealing for refueling function only.
  • FIGs. 3(a) and 3(b) a sectional and enlarged sectional view of the two-stage fuel tank isolation valve (10) in idle condition in accordance with the present invention is shown.
  • the first compression spring (1) for OVR function holds the seal (3) for OVR function in contact with seal sub assembly (2) for OVR function to seal a flow path (23) and second compression spring (19) used for flow resistance function holds the seal sub assembly (2) for OVR function in contact with sealing surface (24) to seal the flow path (25) & keep the valve closed as depicted in Fig. 3(a).
  • the compression spring (4) for OPR function keeps the seal sub assembly (5) for OPR function downwards and attached to the sealing surface (9). Hence, all three openings for OVR and OPR are closed and canister port (13) of the two-stage isolation valve (10) is not connected to the tank port (14) of the two-stage isolation valve (10).
  • the fuel vapors remain inside the fuel tank till the pressure inside the tank is within safety limit as depicted in Fig. 3(b).
  • FIGs. 4(a) - 4(e) sectional and enlarged sectional view of the two-stage fuel tank isolation valve (10) during refueling in accordance with the present invention is shown.
  • the stepper motor (26) is turned on and with stepwise rotation of stepper motor rotor (21), the plunger (7) screwed in the stepper motor rotor (21) move downwards causing seal (3) for OVR function to move downwards by compressing the first compression spring (1) and open the first flow path (23) as depicted in Fig. 4(a).
  • the port opens, and flow starts from the tank port (14) to the canister port (13).
  • the excess fuel vapors go to canister and the pressure starts dropping as depicted in Fig. 5(c).
  • protection point limit i.e. safety limit
  • FIGs. 6(a) - 6(c) sectional and enlarged sectional view of the fuel tank isolation valve (10) working in OVR condition in accordance with the present invention is shown.
  • the fuel tank isolation valve (10) is in OVR condition
  • a stroke is provided between the seal (3) for OVR and the plunger (7) to use the full spring force for sealing without any dependency on threads provided in the bottom end of the plunger (7).
  • a stroke is provided between the seal (3) for OVR function and the stopper bush (18).
  • the same stroke is utilized for the OVR function as it is controlled in line with flow resistance function.
  • the plunger (7) remains at its original position and maximum amount of movement is limited by the amount of stroke provided between the seal (3) for OVR function and the stopper bush (18).
  • the port opens, and flow starts from the canister port (13) to the tank port (14) as depicted in Fig. 6(c).
  • the vacuum starts to release from tank and as soon as the vacuum reaches the protection point limit i.e. safety limit, the port closes.
  • stepper motor gets turned ON. Due to the rotation of stepper motor, the plunger with lead screw moves downwards causing seal for OVR function to move downwards by compressing the first compression spring and opens the first flow path.
  • first condition with motor’s leakage point + 2 rotations a small linear stroke of plunger takes place and a small opening path gets opened which fulfilled the condition of 11.4 L/min max. at 16 kPa.
  • further rotation of motor i.e. at motor’s leakage point + 20 rotations further stroke of plunger took place and opening path area increased which fulfilled the condition of 155 L/min. max. at 16 kPa.
  • the seal for OVR function makes the contact with first seal subassembly and also it starts moving downwards by compressing the second compression spring and it opens the flow path as well.
  • the plunger takes its full stroke and full opening of the valve took place and flow resistance condition of 78 L/min. at a pressure difference of 0.35 kPa max. got fulfilled.
  • the present invention provides a light weighted two stage improved fuel tank isolation valve having reduced size as a stepper motor in comparison to a solenoid vale is light and has reduced size. Further, with the use of stepper motor, the improved fuel tank isolation valve is efficient in precisely controlling the flow in multiple steps.

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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)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)

Abstract

La présente invention concerne une soupape d'isolement de réservoir de carburant améliorée. La présente invention concerne une soupape d'isolement de réservoir de carburant à deux étages améliorée intégrée avec un moteur pas à pas pour maintenir la pression à l'intérieur d'une plage de pression protégée, fournir une commande électrique à deux étages des vapeurs de carburant avec de multiples étapes d'ouverture d'écoulement du réservoir au réservoir à charbon actif pendant le ravitaillement en carburant, fournir un relâchement de pression et un relâchement de vide.
PCT/IB2020/058489 2019-09-05 2020-09-12 Soupape d'isolement de réservoir de carburant améliorée avec moteur pas à pas intégré à conception de soupape en soupape WO2021044394A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202080045786.2A CN114502408A (zh) 2019-09-05 2020-09-12 采用整合步进马达的改良式燃料箱隔离阀

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201911035736 2019-09-05
IN201911035736 2019-09-05

Publications (1)

Publication Number Publication Date
WO2021044394A1 true WO2021044394A1 (fr) 2021-03-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2020/058489 WO2021044394A1 (fr) 2019-09-05 2020-09-12 Soupape d'isolement de réservoir de carburant améliorée avec moteur pas à pas intégré à conception de soupape en soupape

Country Status (2)

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CN (1) CN114502408A (fr)
WO (1) WO2021044394A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016049320A1 (fr) * 2014-09-24 2016-03-31 Eaton Corporation Module de circuit d'alimentation à commande électrique

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Publication number Priority date Publication date Assignee Title
US5996607A (en) * 1998-04-15 1999-12-07 Eaton Corporation Installing a fill limiting vent valve in a fuel tank
US8944100B2 (en) * 2010-03-30 2015-02-03 Eaton Corporation Isolation valve with fast depressurization for high-pressure fuel tank
KR101181065B1 (ko) * 2010-12-02 2012-09-07 기아자동차주식회사 차량의 연료탱크 컨트롤밸브
US20120211687A1 (en) * 2011-02-17 2012-08-23 Benjey Robert P Isolation valve with motor driven sealing mechanism
CN105402050B (zh) * 2015-12-24 2018-02-06 江苏奥力威传感高科股份有限公司 一种油箱隔离电磁阀
CN206206018U (zh) * 2016-10-27 2017-05-31 比亚迪股份有限公司 一种用于高压油箱的隔离阀
CN108626450A (zh) * 2018-07-06 2018-10-09 苏州恩都法汽车系统有限公司 一种集成式油箱隔离阀
CN110486483B (zh) * 2019-09-02 2022-05-03 苏州恩都法汽车系统有限公司 一种电机驱动式高压油箱隔离阀

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016049320A1 (fr) * 2014-09-24 2016-03-31 Eaton Corporation Module de circuit d'alimentation à commande électrique

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