US3503594A - Fuel system - Google Patents

Fuel system Download PDF

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Publication number
US3503594A
US3503594A US754180A US3503594DA US3503594A US 3503594 A US3503594 A US 3503594A US 754180 A US754180 A US 754180A US 3503594D A US3503594D A US 3503594DA US 3503594 A US3503594 A US 3503594A
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United States
Prior art keywords
air
circuit
speed
deceleration
valve
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
US754180A
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English (en)
Inventor
Kenji Goto
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.)
Toyota Motor Corp
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Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Application granted granted Critical
Publication of US3503594A publication Critical patent/US3503594A/en
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
    • F02M3/00—Idling devices for carburettors
    • F02M3/005—Idling fuel enrichment with motor driven instead of driving; Switching the fuel supply from the main to idling jet 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/08—Other details of idling devices
    • F02M3/09—Valves responsive to engine conditions, e.g. manifold vacuum
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/19—Degassers

Definitions

  • This pneumatic circuit consists of a series of openings and holes formed in the carburetor body which connect between an upper part of the carburetor air intake passage and ports below the throttle valve.
  • another pneumatic circuit which connects between an opening in the intake passage wall above the throttle valve and an opening below the throttle valve and the idle and low-speed pneumatic circuit has a branch line leading into this circuit.
  • a valve whose opening is controlled and is dependent upon the vacuum in the intake manifold.
  • the present invention relates to a fuel system for automobile engines, and more particularly to a device for controlling an air-fuel mixture in the deceleration of the engine.
  • the opening of the throttle valve of a carburetor in the deceleration of an automobile by the engine brake is similar to that in its idling operation but, the speed of rotation of the engine is higher. Since the total amount, as well as the mixing ratio of air-fuel mixture to be fed to the engine at that time is the same as when idling, the higher the speed of rotation, the smaller the amount of the air-fuel mixture which is fed to the cylinders, and at every stroke, the amount becomes smaller. In addition to this, the remaining gas dilutes the mixture so that firing of the mixture by ignition plugs will be impossible. Consequently, there will occur what can be called an after-burn. That is to say, the gas which has not yet burnt in the cylinders is brought into combustion in the exhaust pipe, or the gas which has not fully burnt will result in air pollution.
  • the principal object of the present invention is to provide an improved fuel system in which a satisfactory air to fuel ratio in deceleration may be held independently of idling.
  • Another object of the invention is to provide an improved fuel system in which misfiring may be almost completely avoided.
  • a further object of the invention is to provide an improved fuel system in which atomization as well as mixing of fuel in the low-speed pneumatic circuit may be improved also in idling, in acceleration or in normal running.
  • a device for controlling air-fuel mixture in the deceleration of the engine having an idle and low-speed pneumatic' circuit opening into the air intake passage of a carburetor below the throttle valve thereof, the device includes an additional pneumatic circuit for connecting a part of the air intake passage above the throttle valve to a part below the throttle valve and a valve assembly mounted in the additional circuit.
  • the idle and low-speed pneumatic circuit is connected into a part of the additional circuit above the valve assembly by a branch line.
  • the valve assembly normally closed, is opened, when there is a vacuum formed in the air passage below the throttle valve.
  • FIG. 1 illustrates a longitudinal section of a carburetor embodying the invention
  • FIG. 2 illustrates a modification of the air-inlet part in FIG. 1;
  • FIG. 3 is a connection diagram of the electric components of another embodiment of the invention.
  • FIG. 4 is a diagram illustrating the operation of the device according to the invention.
  • air sucked into the air intake passage 2 of a carburetor 1 in high speed operation mixes with fuel supplied from a high-speed nozzle 4 which opens into a secondary venturi 3, and is delivered to cylinders of an engine (not shown) through a main venturi 5.
  • a throttle valve 6 serves to control the amount of air-fuel mixture to be delivered to the-cylinders.
  • An idle and low-speed pneumatic circuit 9 connects on the one hand, between the upper part of the air intake passage 2 in the vicinity of the secondary venturi 3 and, on the other hand, a low-speed port 8 having the shape of a narrow slit in the vicinity of the throttle valve 6.
  • the top of the low-speed circuit 9 is provided with a second low-speed air bleeder 7.
  • Fuel F flowing from a float chamber (not shown) through a low-speed jet 10 mixes with air which enters from the air passage 2 through a first low-speed air bleeder 11 located at nearly the same position as the secondary low-speed air bleeder 7 in the direction of the air intake passage 2, and then flows into the idle and low-speed pneumatic circuit 9 through an economizer jet 12 to form a mixture necessary for idling or low-speed operation together with air supplied through the secondlow-speed air bleeder 7.
  • an idle port 13 which communicates with the idle and low-speed pneumatic circuit 9 and whose cross section is adjustable by means of an idle adjustment needle 14.
  • Deceleration circuit 24 consists of an upper section 2411 and a lower section 24b, and connects between an opening 21 located above venturi 3, i.e., above the throttle valve 6, and an opening 22 below the idle port 13, therefore below the throttle valve 6.
  • a valve assembly 23 In the lower section 24b there is mounted a valve assembly 23.
  • an air inlet pipe 21' which extends into the air intake passage 2 as shown in FIG. 2.
  • 25 denotes an adjustment needle for adjusting air flowing into the upper pneumatic circuit section 24a.
  • the valve body 31 of the valve assembly 23 is coupled to a diaphragm 33 of a vacuum responsive device 32.
  • the diaphragm 33 separates a first diaphragm chamber 34 which is in communication with the circuit section 24b from a second diaphragm chamber 35 which communicates with an opening 37 in the intake manifold 40 so that the valve assembly 23 may cause the valve body 31 to close or open in response to vacuum in the intake manifold 40.
  • An adjustment screw 38 serves to adjust the biasing force of a Spring 39 for biasing the diaphragm 33.
  • vacuum in the intake manifold 40 lies in the range from to 530 mm. Hg (with respect to an atmospheric pressure), in which the valve assembly 23 is held closed as shown.
  • the passage consisting of sections 21, 24a and 26 serves as a third low-speed air bleeder for the idle and low-speed pneumatic circuit 9 together with the second low-speed air bleeder 7, and promotes atomization of the fuel in the idle and lowspeed circuit. Namely, air from the opening 21 flows into the circuit 9 through the air adjustment needle 25, deceleration circuit section 24a and the fuel adjustment needle 27, and mixes with the air-fuel mixture from the economizer jet 12.
  • the air-fuel mixture of a satisfactory richness is now fed to the intake manifold 40 through the then opened valve assembly 23 and the opening 22.
  • the fuel adjustment needle 27 and the air adjustment needle 25 may be adjusted to form the mixture of a desired richness.
  • a magnet valve whose coil is connected in series with a switch which is operated mechanically by a negative responsive device.
  • FIG. 3 A diaphragm 33' of a vacuum responsive device 32', which is applied at one side with vacuum in the intake manifold 40 through an opening 37, carries a bridging contact of a switch 41 inserted in the energizing circuit of a magnet valve 23'.
  • vacuum in the intake manifold 40 causes the switch 41 to close so that current flows from a battery 42 to the coil 43 of the magnet valve 23.
  • a core 44 then magnetized attracts a valve body 31 against the force of a biasing spring 45, thereby providing communication between deceleration sections 24a and 24b.
  • 46 denotes a pilot lamp for indicating energization of the magnet coil 43.
  • air for deceleration circuit is supplied from an air cleaner 52 having a filter 51 mounted on the carburetor body.
  • the embodiment has the advantage that the vacuum responsive device 32 including the switch and the valve assembly 23' as well as the magnet can be separately mounted.
  • FIG. 4 illustrates the relation between the speed of rotation N of an engine and the vacuum P in the manifold.
  • a solid line represents the relation while idling, while a broken line represents the relation in deceleration. If the negative responsive device in FIG. 1 or FIG. 3 is so set as to respond at A mm. Hg, it will remain operative until the engine is decelerated up to B r.p.m.
  • an engine carburetor (1) including an elongated intake passage (2) terminating in an intake manifold (40), with a throttle valve (6) in said passage (2), an arrangement for controlling the air-fuel mixture during the deceleration of the engine, including an idle and lowspeed pneumatic by-pass circuit (9) opening into said air intake passage from below (8) said throttle valve therein, said arrangement comprising:
  • valve assembly (23) mounted in said additional pneumatic circuit having a vacuum responsive diaphragm therein;
  • biasing means (39) maintaining said valve assembly normally closed, said valve assembly being opened in response to a vacuum in said intake manifold (40);
  • An arrangement as claimed in claim 1 including an air inlet pipe for said additional circuit extending into said air intake passage.
  • valve assembly (23) including adjustment means (38) to adjust the biasing force of said biasing means (39).
  • a carburetor device for providing an air-fuel mixture in deceleration of an internal combustion engine having an idling and low speed circuit for the supply of an air-fuel mixture, said internal combustion engine including a carburetor with an air intake passage in the vicinity thereof, said air-intake passage having a throttle valve therein, an additional circuit having needle valves both for air and air-fuel passage, said additional circuit communicating between a part of the air intake passage upstream of the throttle valve and a part of the air intake passage downstream of the throttle valve, a valve assem- 5 6 bly mounted in the additional circuit, the idling and low- 2,824,726 2/1958 Dietrich ct a1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US754180A 1967-08-28 1968-08-21 Fuel system Expired - Lifetime US3503594A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5481467 1967-08-28

Publications (1)

Publication Number Publication Date
US3503594A true US3503594A (en) 1970-03-31

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ID=12981156

Family Applications (1)

Application Number Title Priority Date Filing Date
US754180A Expired - Lifetime US3503594A (en) 1967-08-28 1968-08-21 Fuel system

Country Status (4)

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US (1) US3503594A (sv)
DE (1) DE1751913C3 (sv)
FR (1) FR1577028A (sv)
GB (1) GB1239285A (sv)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661367A (en) * 1970-04-17 1972-05-09 Sibe Carburetors for internal combustion engines
US3669424A (en) * 1969-12-09 1972-06-13 Nissan Motor Carburetor of variable-area venturi type
US3677526A (en) * 1969-03-03 1972-07-18 Sibe Carburetion devices for internal combustion engine
US3756208A (en) * 1969-02-05 1973-09-04 Nissan Motor Apparatus for reducing hydrocarbon content of exhaust gases during deceleration
US3782346A (en) * 1970-03-30 1974-01-01 Toyo Kogyo Co Intake system for internal combustion engine
US3852391A (en) * 1971-03-11 1974-12-03 Nissan Motor Carburetor with deceleration circuit
US3866584A (en) * 1970-11-03 1975-02-18 Volkswagenwerk Ag Switching device and circuit
US3949717A (en) * 1971-10-22 1976-04-13 Robert Bosch G.M.B.H. Pressure reduction limiter in a combustion engine
US3963670A (en) * 1975-03-07 1976-06-15 Acf Industries, Incorporated Integrated idle and by-pass system
JPS51116319U (sv) * 1975-03-14 1976-09-21
US4008696A (en) * 1974-03-19 1977-02-22 Nissan Motor Co., Ltd. Carburetor for optimum control of an air-fuel mixture supply to the engine during deceleration
US4118445A (en) * 1976-03-18 1978-10-03 Kabushiki Kaisha Keihinseiki Seisakusho Sliding throttle valve type carburetor
US4211200A (en) * 1977-04-21 1980-07-08 Audi Nsu Auto Union Aktiengesellschaft Vacuum force amplifier for internal combustion engine
US4283354A (en) * 1978-12-22 1981-08-11 Pierburg Gmbh & Co. Kg Carburetor for internal-combustion engines
US4321900A (en) * 1979-10-12 1982-03-30 Toyota Jidosha Kogyo Kabushiki Kaisha Fuel injection type internal combustion engine
US4349489A (en) * 1979-07-26 1982-09-14 Alain Gaget Jet for the production of a vaporized idling mixture in an internal combustion engine
WO1984000194A1 (en) * 1980-12-24 1984-01-19 Prochazka Anezka Fuel control for internal combustion engines

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5164137A (sv) * 1974-11-29 1976-06-03 Nissan Motor
JPS5610937Y2 (sv) * 1976-07-07 1981-03-12
DE2817026C2 (de) * 1978-04-19 1983-07-07 Central'nyj naučno-issledovatel'skij avtomobil'nyj i avtomotornyj institut (NAMI), Moskva Leerlaufbrennstoffsystem in einem Vergaser für Brennkraftmaschinen
FR2452002A1 (fr) * 1979-03-22 1980-10-17 Sibe Perfectionnements aux dispositifs de carburation pour moteurs a combustion interne

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386340A (en) * 1944-12-18 1945-10-09 George M Holley Decelerator
US2621911A (en) * 1947-12-30 1952-12-16 Bendix Aviat Corp Carburetor
US2824726A (en) * 1955-11-08 1958-02-25 Gen Motors Corp Degasser attachment for internal combustion engines
US3146844A (en) * 1962-05-17 1964-09-01 Acf Ind Inc Engine idle speed control
US3374991A (en) * 1965-03-12 1968-03-26 Walker Brooks Carburetor
US3408054A (en) * 1967-07-26 1968-10-29 Walker Brooks Carburetor

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR631753A (fr) * 1926-06-28 1927-12-26 Perfectionnements dans les carburateurs
FR773899A (fr) * 1933-08-24 1934-11-27 Système de réglage aux faibles allures et départ à froid des carburateurs pour moteurs à explosion et autres applications
FR800897A (fr) * 1935-04-24 1936-07-21 Perfectionnements aux carburateurs
US2208864A (en) * 1937-12-16 1940-07-23 Carter Carburetor Corp Carburetor device
US2935167A (en) * 1956-10-22 1960-05-03 Kelsey Hayes Co Emergency vacuum system
FR1194687A (fr) * 1958-04-15 1959-11-12 Procédé et dispositif pour réduire la consommation de carburant des véhicules automobiles
DE1086943B (de) * 1958-07-11 1960-08-11 Brev Etudes S I B E Soc A Resp Vergaser mit Schwimmerbehaelter fuer Verbrennungsmotoren
US3043572A (en) * 1959-07-13 1962-07-10 Acf Ind Inc Separate thermostat controlled latch mechanism for secondary throttles
US3081985A (en) * 1960-11-03 1963-03-19 Chrysler Corp Deceleration air bleed for fuel charging manifold
US3027884A (en) * 1960-11-18 1962-04-03 Gen Motors Corp Engine device for reducing unburned hydrocarbons
US3304068A (en) * 1964-08-13 1967-02-14 Ford Motor Co Automatic idle speed-up device
DE1601993C3 (de) * 1967-04-06 1974-02-28 Societe Industrielle De Brevets Et D'etudes S.I.B.E., Neuilly-Sur-Seine (Frankreich) Vergaser für Brennkraftmaschinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386340A (en) * 1944-12-18 1945-10-09 George M Holley Decelerator
US2621911A (en) * 1947-12-30 1952-12-16 Bendix Aviat Corp Carburetor
US2824726A (en) * 1955-11-08 1958-02-25 Gen Motors Corp Degasser attachment for internal combustion engines
US3146844A (en) * 1962-05-17 1964-09-01 Acf Ind Inc Engine idle speed control
US3374991A (en) * 1965-03-12 1968-03-26 Walker Brooks Carburetor
US3408054A (en) * 1967-07-26 1968-10-29 Walker Brooks Carburetor

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756208A (en) * 1969-02-05 1973-09-04 Nissan Motor Apparatus for reducing hydrocarbon content of exhaust gases during deceleration
US3677526A (en) * 1969-03-03 1972-07-18 Sibe Carburetion devices for internal combustion engine
US3669424A (en) * 1969-12-09 1972-06-13 Nissan Motor Carburetor of variable-area venturi type
US3782346A (en) * 1970-03-30 1974-01-01 Toyo Kogyo Co Intake system for internal combustion engine
US3661367A (en) * 1970-04-17 1972-05-09 Sibe Carburetors for internal combustion engines
US3866584A (en) * 1970-11-03 1975-02-18 Volkswagenwerk Ag Switching device and circuit
US3852391A (en) * 1971-03-11 1974-12-03 Nissan Motor Carburetor with deceleration circuit
US3949717A (en) * 1971-10-22 1976-04-13 Robert Bosch G.M.B.H. Pressure reduction limiter in a combustion engine
US4008696A (en) * 1974-03-19 1977-02-22 Nissan Motor Co., Ltd. Carburetor for optimum control of an air-fuel mixture supply to the engine during deceleration
US3963670A (en) * 1975-03-07 1976-06-15 Acf Industries, Incorporated Integrated idle and by-pass system
JPS51116319U (sv) * 1975-03-14 1976-09-21
US4118445A (en) * 1976-03-18 1978-10-03 Kabushiki Kaisha Keihinseiki Seisakusho Sliding throttle valve type carburetor
US4211200A (en) * 1977-04-21 1980-07-08 Audi Nsu Auto Union Aktiengesellschaft Vacuum force amplifier for internal combustion engine
US4283354A (en) * 1978-12-22 1981-08-11 Pierburg Gmbh & Co. Kg Carburetor for internal-combustion engines
US4349489A (en) * 1979-07-26 1982-09-14 Alain Gaget Jet for the production of a vaporized idling mixture in an internal combustion engine
US4321900A (en) * 1979-10-12 1982-03-30 Toyota Jidosha Kogyo Kabushiki Kaisha Fuel injection type internal combustion engine
WO1984000194A1 (en) * 1980-12-24 1984-01-19 Prochazka Anezka Fuel control for internal combustion engines

Also Published As

Publication number Publication date
DE1751913A1 (de) 1970-04-23
GB1239285A (sv) 1971-07-14
FR1577028A (sv) 1969-08-01
DE1751913B2 (de) 1977-10-20
DE1751913C3 (de) 1983-04-14

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