US3572659A - Fuel tank vapor recovery control - Google Patents

Fuel tank vapor recovery control Download PDF

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Publication number
US3572659A
US3572659A US756781A US3572659DA US3572659A US 3572659 A US3572659 A US 3572659A US 756781 A US756781 A US 756781A US 3572659D A US3572659D A US 3572659DA US 3572659 A US3572659 A US 3572659A
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United States
Prior art keywords
valve
fuel
air
vacuum
fuel vapor
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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
US756781A
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English (en)
Inventor
Kazimieras Kizlauskas
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Ford Motor Co
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Ford Motor Co
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Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
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Publication of US3572659A publication Critical patent/US3572659A/en
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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
    • B60K15/03504—Fuel tanks characterised by venting means adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
    • 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
    • F02M25/0872—Details of the fuel vapour pipes or conduits

Definitions

  • the line contains a fuel-air mixing valve that is opened by fuel tank vapor pressure to add air in the correct proportion to the fuel vapors so that the overall air-fuel ratio in the engine is unaffected by the addition of more fuel.
  • a vacuum override to shut the valve is provided to prevent excessive idle speed rpm increase.
  • This invention relates, in general, to a motor vehicle engine fuel vapor recovery system. More particularly, it relates to the construction of a fuehair mixing valve for use in such a system.
  • the invention relates to-a valve located in the lines between a fuel tank or reservoir and the engine intake manifold for properly proportioning the amount of air to be mixed with the fuel vapors forced into the manifold.
  • the overall carburetor fuel-air ratio is unaffected by the addition of vaporized fuel from the fuel tank.
  • FIG. 1 illustrates, schematically, an internal combustion engine fuel vapor recovery system
  • FIG. 2 shows an enlarged cross-sectional view of the air-fuel mixing valve of FIG. 1.
  • FIG. 1 shows an internal combustion engine 10. It includes a cylinder block and crankcase 12 on which is mounted an intake manifold illustrated schematically at 14. Secured on the manifold is a conventional downdraft type carburetor having the usual main fuel-air mixture induction passage 16 containing a venturi 18. Flow through passage 16 is controlled by a pivotally mounted throttle valve 20. A known type of dry element air cleaner 22 covers the fresh air inlet to induction passage 16.
  • the carburetor in this case has a float bowl or fuel reservoir 24 that receives a supply of fuel through conduit means, not shown, from a fuel tank or reservoir 26, in a known manner.
  • the fuel tank consists of a suitable container connected to an overflow tank indicated in general at 30.
  • a fuel filler pipe 32 is closed by a cap 34, and has an overflow connection 36 joined to the overflow tank.
  • the fuel vapors from tank 26 are adapted to be directed to the intake manifold 14 of engine to be subsequently burned in the engine combustion chambers and thus be converted to less harmful forms before being passed into the atmosphere.
  • the fuel tank vapors are routed to the intake manifold through a fuel-air proportioning valve means 40.
  • valve means 40 includes a valve body 42 having a bore 44 in which is slidably mounted a spool valve 46.
  • the latter has spaced lands 48, 50 and 52 connected by neck portions 54 and 56 of reduced diameter forming annular fluid chambers 58 and 60, respectively.
  • the right-hand portion of the valve bore has a reduced diameter 62 that defines an annular fuel vapor pressure chamber 64. It also defines a shoulder 66 constituting a stop for the rightward movement of valve 46.
  • the valve is biased against the stop by a spring 68.
  • the fuel vapor overflow tank 30 is connected by a line 70 (also see FIG. 1) to the valve bore 44 where it is blocked from further flow by the closed position of valve 46 shown.
  • a branch line 72 is connected to chamber 64 so as to act on the right-hand end of the valve, in a manner to be described.
  • the valve bore 44 is also connected to a supply of fresh air through a conduit 74 having an apertured air inlet or breather cap 76.
  • the opposite portion of the valve body is provided with two outlet lines 77 and 78 that are interconnected to a common line 80. Lines 77 and 78, which are normally blocked in the closed position shown of the valve 46, cooperate respectively with the fresh air line 74 and fuel vapor line 70 when valve 46 moves from the position shown, as will be described more clearly later.
  • Both lines 74 and 70 contain flow restricting orifices 82 and 84 each of a size calibrated to provide the proper ratio mixture of air and fuel in line when valve 46 is moved to the left to interconnect lines 74 and 77,
  • the valve body is further provided with a line 86 opening into the chamber'88 defined between the end land 48 of the valve and the valve bore 44.
  • Chamber 88 is connected at its opposite end (FIG. 1) to the carburetor induction passage 16 at a location below the closed throttle position of throttle valve 20. This is so the intake manifold vacuum will act at all times on the valve land 48 for a purpose to be described.
  • the mixing valve will seek an equilibrium position between fully open and closed positions, to regulate the quantity of additional air-fuel mixture to be added so as to continue supplying fuel vapor and air so long as the desired maximum idle rpm. is not exceeded, assuming the fuel vapor remains the same.
  • the mixing valve will seek an equilibrium position between fully open and closed positions, to regulate the quantity of additional air-fuel mixture to be added so as to continue supplying fuel vapor and air so long as the desired maximum idle rpm. is not exceeded, assuming the fuel vapor remains the same.
  • the mixing valve will seek an equilibrium position between fully open and closed positions, to regulate the quantity of additional air-fuel mixture to be added so as to continue supplying fuel vapor and air so long as the desired maximum idle rpm. is not exceeded, assuming the fuel vapor remains the same.
  • the mixing valve will seek an equilibrium position between fully open and closed positions, to regulate the quantity of additional air-fuel mixture to be added so as to continue supplying fuel vapor and air so long as the desired maximum idle rpm. is not exceeded, assuming
  • valve 46 should decrease so that eventually the valve 46 will close because the tank vapor pressure is below one-half p.s.i.
  • the tank pressure will not, as a rule, ever rise enoughto itself move valve 46 against stop 90.
  • the invention provides a complete metered burning of evaporated fuel in the combustion chambers of the engine; and that, therefore, there is no emission of raw fuel vapors into the atmosphere. It will also be seen that the invention provides a fuel vapor recovery system in which the overall engine fuel-air ratio is unaffected by the addition of evaporated fuel.
  • a fuel vapor emission control for use with an internal combustion engine having an intake manifold providing a variable source of vacuum, a carburetor having a fuel-air induction passage and a throttle valve rotatably mounted therein to control flow therethrough, a fuel reservoir having a fuel vapor area therein, said emission control comprising, a conduit means connecting the fuel vapor area to said vacuum at a point below said throttle valve, a' source of air connected to said conduit means, and fuel-air proportioning valve means in said conduit means controlling the flow of fuel vapor and air therethrough, said valve means including-a reciprocable valve spring-biased to an off position blocking flow of both fuel and air therepast, and variably movable therefrom by fuel vapor pressure above a predetermined level acting on one end of said valve to an on position connecting the vacuum to said air and fuel vapor.
  • a fuel vapor emission control for use with an internal combustion engine having an intake manifold providing a variable source of vacuum, a carburetor having a fuel-air induction passage and a throttle valve rotatably mounted therein to control flow therethrough, a fuel reservoir having a fuel vapor area therein, said emission control comprising, conduit means connecting the fuel vapors to said intake manifold, a source of air, and fuel vapor-air proportioning valve means in said conduit means controlling the mixture of and flow of fuel vapor and air therethrough to said manifold,said valve means comprising a valve body slidably containing a spool valve movable to a plurality of positions and having a plurality of axially spaced interconnected lands, said valve body having an air inlet connected to said source of air and an outlet spaced therefrom, and a fuel vapor inlet and an outlet spaced therefrom, means joining said outlets, said valve in a first position connecting said inlets to their respective outlets and in the remaining of said plurality of positions blocking the
  • a control as in claim 4 including connecting means connecting said valve to said vacuum whereby said valve is acted upon and moved by said vacuum to a blocking position above a predetermined vacuum level.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US756781A 1968-09-03 1968-09-03 Fuel tank vapor recovery control Expired - Lifetime US3572659A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75678168A 1968-09-03 1968-09-03

Publications (1)

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US3572659A true US3572659A (en) 1971-03-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US756781A Expired - Lifetime US3572659A (en) 1968-09-03 1968-09-03 Fuel tank vapor recovery control

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US (1) US3572659A (fr)
DE (1) DE1943545A1 (fr)
GB (1) GB1265060A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2406843A1 (de) * 1973-02-17 1974-08-22 Nissan Motor Druckausgleichsanordnung fuer kraftstoffbehaelter
US4003358A (en) * 1974-08-27 1977-01-18 Toyo Kogyo Co., Ltd. Control system for controlling an air-fuel mixture in internal combustion engine
US20040123846A1 (en) * 2002-09-10 2004-07-01 Rado Gordon E. Emissions control system for small internal combustion engines
US20050092305A1 (en) * 2003-10-03 2005-05-05 Rado Gordon E. Centrifugally operated evaporative emissions control valve system for internal combustion engines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922066B2 (ja) * 1979-03-08 1984-05-24 日産自動車株式会社 内燃機関の蒸発燃料処理装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1948135A (en) * 1931-08-25 1934-02-20 Zenith Detroit Corp Carburetor
US2029142A (en) * 1933-03-15 1936-01-28 Wemhoner Wilhelm Carburetor for combustion engines
US3001519A (en) * 1960-08-08 1961-09-26 Gen Motors Corp Fuel vapor loss elimination system
US3172348A (en) * 1963-12-23 1965-03-09 Tony Piet Motor Sales Inc Internal combustion engines and motor vehicles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1948135A (en) * 1931-08-25 1934-02-20 Zenith Detroit Corp Carburetor
US2029142A (en) * 1933-03-15 1936-01-28 Wemhoner Wilhelm Carburetor for combustion engines
US3001519A (en) * 1960-08-08 1961-09-26 Gen Motors Corp Fuel vapor loss elimination system
US3172348A (en) * 1963-12-23 1965-03-09 Tony Piet Motor Sales Inc Internal combustion engines and motor vehicles

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2406843A1 (de) * 1973-02-17 1974-08-22 Nissan Motor Druckausgleichsanordnung fuer kraftstoffbehaelter
US4003358A (en) * 1974-08-27 1977-01-18 Toyo Kogyo Co., Ltd. Control system for controlling an air-fuel mixture in internal combustion engine
US20040123846A1 (en) * 2002-09-10 2004-07-01 Rado Gordon E. Emissions control system for small internal combustion engines
US7131430B2 (en) 2002-09-10 2006-11-07 Tecumseh Products Company Emissions control system for small internal combustion engines
US20070079814A1 (en) * 2002-09-10 2007-04-12 Tecumseh Products Company Emissions control system for small internal combustion engines
US20050092305A1 (en) * 2003-10-03 2005-05-05 Rado Gordon E. Centrifugally operated evaporative emissions control valve system for internal combustion engines
US7047951B2 (en) 2003-10-03 2006-05-23 Tecumseh Products Company Centrifugally operated evaporative emissions control valve system for internal combustion engines

Also Published As

Publication number Publication date
GB1265060A (fr) 1972-03-01
DE1943545A1 (de) 1970-03-12

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