US3741188A - Carburetor idle system air bleed - Google Patents

Carburetor idle system air bleed Download PDF

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Publication number
US3741188A
US3741188A US00204616A US3741188DA US3741188A US 3741188 A US3741188 A US 3741188A US 00204616 A US00204616 A US 00204616A US 3741188D A US3741188D A US 3741188DA US 3741188 A US3741188 A US 3741188A
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US
United States
Prior art keywords
engine
idle
circuit
switch
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
US00204616A
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English (en)
Inventor
R Rickey
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.)
Ford Motor Co
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Ford Motor Co
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 Ford Motor Co filed Critical Ford Motor Co
Application granted granted Critical
Publication of US3741188A publication Critical patent/US3741188A/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
    • F02M3/08—Other details of idling devices
    • 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
    • Y10S123/00—Internal-combustion engines
    • Y10S123/11—Antidieseling
    • 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
    • Y10S261/74—Valve actuation; electrical

Definitions

  • Carburetor constructions are known in which valving is inserted in the engine idle system air/fuel mixture channel in response to engine shutdown to block off the flow of an air/fuel mixture to the engine cylinders to thereby prevent engine dieseling or afterrun.
  • Such devices generally are not satisfactory because of the extremely close tolerances required to assure that no fuel will leak past the valve when it is closed, or that air will not leak into the idle channel around the valve when the valve is withdrawn and normal operation of the idle system is desired.
  • FIGURE illustrates schematically a cross sectional view of a portion of a carburetor embodying the invention.
  • the carburetor in this case is for the most part a conventional one of the downdraft type. It includes a valve body having a central bore constituting the usual induction passage 14.
  • the upper end of passage 14 generally would be connected to an air cleaner assembly lel relationship to induction passage 14 to supply an idle speed air/fuel mixture to the engine when throttle valve 18 is in its closed position shown.
  • the upper end of the idle channel has a branch 24 connected to the air horn or essentially atmospheric pressure section of the carburetor through an orifice or anti-siphon bleed 26.
  • the adjacent portion of passage 22 contains an idle system fuel jet 28, the upstream end of which would be connected to the conventional fuel float bowl, not shown.
  • the top of the fuel in the float bowl normally is at the pressure of the top or air horn section of the carburetor.
  • idle channel 22 contains the usual transfer port 34 adapted to be straddled by the edge of throttle plate 18 when in its closed position shown. Also provided is an air/fuel mixture discharge port 36, the area of which is controlled by an adjustable needle valve 38.
  • This same vacuum signal is present for a short-lived but determinate period upon engine shutdown prior to the engine crankshaft ceasing rotation, to continue drawing an idle channel air/fuel mixture into the engine cylinders. So long as this occurs, the engine may diesel or afterrun.
  • the idle channel 22 is provided with a branch passage 40 that is open to air at atmospheric pressure.
  • the passage is adapted to be closed by a solenoid controlled valve that is responsive both to engine ignition shutoff and a change in manifold vacuum pressure.
  • a hollow casing 42 is threadedly mounted in the carburetor valve body as shown. It is open at opposite ends to communicate with air at atmospheric pressure at end 44 and with the passage 40 at the opposite end 46.
  • a valve member 48 is slidably mounted in shell 42 and aligned with passage 40 for movement to block or open the passage.
  • the valve is formed as an integral part of the armature 50 of a solenoid 51 having a coil illustrated at 52.
  • a spring 54 normally biases the valve to close passage port 40 when the solenoid is de-energized.
  • the solenoid 51 is part of an electrical circuit that includes a conventional vehicle battery 56, an engine onoff ignition switch 58, an engine intake manifold vacuum controlled switch 60, and a relay controlled switch 62.
  • the vacuum switch may be of a known type having a spring 64 biasing the valve to normally open the switch contacts 65 and break the circuit, and closed to complete the circuit by intake manifold vacuum.
  • the vacuum is connected to switch 60 from a carburetor port 66 through a line 67.
  • the relay control switch 62 is closed by a spring 68 to complete the circuit, when the relay is de-energized, the switch being opened to break the circuit upon energization of the relay coil 70.
  • the ignition on-off switch 58 and the manifold vacuum control switch 60 are arranged in a parallel flow circuit relationship between the battery and the relay control switch 62, and that the latter switch is in a series arrangement with the solenoid 51.
  • vacuum switch 60 In operation, with the engine off, no manifold vacuum will exist. Accordingly, vacuum switch 60 will be moved by spring 64 to unbridge the contacts 65 and break the circuit between battery 56 and relay switch 62. The latter switch will have been spring closed since coil 70 is de-energized by the open ignition switch 58. Therefore, solenoid 51 will be ole-energized and spring 54 will maintain air bleed valve 48 seated in the passage 40 to block the admission of additional air.
  • the ignition switch 58 Upon engine shutdown, the ignition switch 58 is opened to the position shown, which breaks the circuit between the battery and the relay control switch 62. This allows the latter switch to close and bridge thecircuit between the closed vacuum'switch 60 and solenoid At the moment of ignition shut off, the continuing rotation of the engine crankshaft as it is slowing down continues to maintain a manifold vacuum on switch 60 to maintain it closed. Accordingly, for a predetermined time interval after engine ignition shut off, solenoid 51 will remain energizedto open the air bleed valve 48 and admit atmospheric air pressure into idle channel 22. This will immediately decay the pressure differential across the fuel jet 28 to immediately terminate idle channel fuel flow and thereby positively terminate con tinued running of the engine due to lack of a combustible mixture.
  • the engine manifold vacuum will have decayed to a point permitting the vacuum switch spring 64 to again open switch 60 and break the circuit between the battery 56 and solenoid 51.
  • the air bleed valve 48 then is closed by spring 54 and the idle channel again is conditioned for a-conventional operation for restarting and running the engine.
  • the invention provides an engine anti-dieseling device that is simple inconstruction and operation and yet positively terminates idle channel fuel flow after engine ignition shut off to prevent continued running of the engine, while subsequently reconditioning the idle system for a normal operation. for engine starting and running.
  • An engine anti-dieseling control comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, an idle fuel/air mixture channel connected to the induction passage below the closed position of the throttle valve so that the idle channel is subjected to manifold vacuum at all times to provide normal idle and off idle speed vacuum signals with corresponding mixture flow, an air bleed port in the idle channel, an electrically controlled valve movable to open and close the port, an electrical circuit including an electrical source and electrically actuated means connected to the valve, first means responsive to engine shutdown completing the circuit and energizing the electrically
  • An engine anti-dieseling control comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one'end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, an idle fuel/air mixture channel connected to the induction passage below the closed position of the throttle valve so that the idle channel is subjected to manifold vacuum at all times to provide normal idle and off idle speed vacuum signals with corresponding mixture flow, an air bleed port in the idle channel, an electrically controlled valve movable to open and close the port, an electrical circuit including an electrical source and electrically actuated means connected to the valve, first means responsive to engine shutdown completing the circuit and energizing the electrically
  • An engine anti-dieseling control comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, an idle fuel/air mixture channel connected to the induction passage below the closed position of the throttle valve so that the idle channel is subjected to manifold vacuum at all times to provide normal idle and off idle speed vacuum signals with corresponding mixture flow, an air bleed port in the idle channel, an electrically controlled valve movable to open and close the port, an electrical circuit including an electrical source and electrically actuated means connected to the valve, first means responsive to engine shutdown completing the circuit and energizing the electrically

Landscapes

  • 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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US00204616A 1971-12-03 1971-12-03 Carburetor idle system air bleed Expired - Lifetime US3741188A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20461671A 1971-12-03 1971-12-03

Publications (1)

Publication Number Publication Date
US3741188A true US3741188A (en) 1973-06-26

Family

ID=22758673

Family Applications (1)

Application Number Title Priority Date Filing Date
US00204616A Expired - Lifetime US3741188A (en) 1971-12-03 1971-12-03 Carburetor idle system air bleed

Country Status (5)

Country Link
US (1) US3741188A (enExample)
JP (1) JPS4867627A (enExample)
CA (1) CA965668A (enExample)
DE (1) DE2258550A1 (enExample)
GB (1) GB1384655A (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867919A (en) * 1973-02-05 1975-02-25 Ford Motor Co Anti-dieseling control
US3996908A (en) * 1975-02-21 1976-12-14 General Motors Corporation Fuel shut-off valve assembly
US3996909A (en) * 1975-02-21 1976-12-14 General Motors Corporation Fuel shut-off valve assembly
US4277424A (en) * 1979-12-21 1981-07-07 Shivers Jr Charles B Carburetor for internal combustion engines
US4372896A (en) * 1979-06-08 1983-02-08 Weber S.P.A. Device adapted to correct the air-fuel ratio of the mixture delivered by a carburetor during the periods of operation at low loads of a motor vehicle engine
US4768480A (en) * 1987-12-10 1988-09-06 General Motors Corporation Engine with spark ignition operation through the oil pressure switch after fuel shutoff
US4784096A (en) * 1984-04-02 1988-11-15 Walbro Corporation Carburetor idle vent control
US6615792B1 (en) * 2002-05-06 2003-09-09 Walbro Engine Management Llc Carburetor fuel shut-off system
US20220033289A1 (en) * 2018-09-14 2022-02-03 Eclean Technologies, Llc Vacuum regulated ozone generator
US12359644B2 (en) * 2023-07-28 2025-07-15 Chongqing Zongshen General Power Machine Co., Ltd. Non-road engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4428005Y1 (enExample) * 1966-01-17 1969-11-21
JPS4522725Y1 (enExample) * 1966-09-21 1970-09-08

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867919A (en) * 1973-02-05 1975-02-25 Ford Motor Co Anti-dieseling control
US3996908A (en) * 1975-02-21 1976-12-14 General Motors Corporation Fuel shut-off valve assembly
US3996909A (en) * 1975-02-21 1976-12-14 General Motors Corporation Fuel shut-off valve assembly
US4372896A (en) * 1979-06-08 1983-02-08 Weber S.P.A. Device adapted to correct the air-fuel ratio of the mixture delivered by a carburetor during the periods of operation at low loads of a motor vehicle engine
US4277424A (en) * 1979-12-21 1981-07-07 Shivers Jr Charles B Carburetor for internal combustion engines
US4784096A (en) * 1984-04-02 1988-11-15 Walbro Corporation Carburetor idle vent control
US4768480A (en) * 1987-12-10 1988-09-06 General Motors Corporation Engine with spark ignition operation through the oil pressure switch after fuel shutoff
US6615792B1 (en) * 2002-05-06 2003-09-09 Walbro Engine Management Llc Carburetor fuel shut-off system
US20220033289A1 (en) * 2018-09-14 2022-02-03 Eclean Technologies, Llc Vacuum regulated ozone generator
US11919789B2 (en) * 2018-09-14 2024-03-05 Eclean Technologies, Llc Vacuum regulated ozone generator
US12359644B2 (en) * 2023-07-28 2025-07-15 Chongqing Zongshen General Power Machine Co., Ltd. Non-road engine

Also Published As

Publication number Publication date
DE2258550A1 (de) 1973-06-07
CA965668A (en) 1975-04-08
JPS4867627A (enExample) 1973-09-14
GB1384655A (en) 1975-02-19

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