US3736915A - Carburetor emission control device - Google Patents

Carburetor emission control device Download PDF

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Publication number
US3736915A
US3736915A US00202894A US3736915DA US3736915A US 3736915 A US3736915 A US 3736915A US 00202894 A US00202894 A US 00202894A US 3736915D A US3736915D A US 3736915DA US 3736915 A US3736915 A US 3736915A
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US
United States
Prior art keywords
engine
throttle valve
movement
idle speed
lever
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
US00202894A
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English (en)
Inventor
W Dickensheets
A Nowroski
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
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Publication of US3736915A publication Critical patent/US3736915A/en
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    • 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
    • F02M3/06—Increasing idling speed
    • F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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

Definitions

  • This invention relates, in general, to means for controlling the movement of the throttle valve of a carburetor. More particularly, it relates to a mechanically and electrically controlled power means to control fuel and air flow through a carburetor to prevent engine dieseling and minimize the passage of unburned hydrocarbons into the atmosphere.
  • This invention provides a carburetor throttle valve construction that (1) permits closing of the throttle valve upon engine shutdown to reduce fuel and air flow; or (2) is positioned to a curb idle position for normally maintaining the engine at a normal idling speed; or (3) is positioned to a faster idle position for the leaner start of a hot engine.
  • the minimum flow and engine idle speed positions of the throttle valve usually are the same. Therefore, when the engine is shut off, the above conditions exist; that is, the vacuum signal still present for a few seconds draws a sufficient charge of fuel/air mixture into the combustion chamber to maintain the engine running.
  • the invention provides a construction in which the throttle valve is moved to a closed position upon engine shutdown, to reduce flow to the cylinders and prevent dieseling; is moved to a fast idle position for restarting; and to an engine idle speed position during normal engine operation so that idle system fuel and air flow can be obtained in the conventional manner.
  • FIGURE illustrates schematically a crosssectional view of a portion of a carburetor embodying the invention.
  • the FIGURE illustrates a portion of a downdraft type carburetor, although it will be clear as the description proceeds that the invention is equally applicable to other types of carburetors, such as updraft or sidedraft, for example.
  • the carburetor is provided with a main body portion 12 having a cylindrical bore 14 containing a conventional venturi (not shown) in an air/fuel induction passage 16.
  • the latter is open at its upper end to air at essentially atmospheric pressure passing through the conventional air cleaner, not shown.
  • passage 16 is adapted to be connected to an engine intake manifold, from which the air and fuel mixture passes to the engine cylinders, not shown, in a known manner.
  • the flow of air and fuel through induction passage 16 is controlled in this instance by a conventional throttle valve 22.
  • the latter is fixedly mounted on a shaft 24 rotatably mounted in the side walls of body 12, in a known manner.
  • a main fuel system is not shown, since it can be any of many known types.
  • the fuel would be inducted into passage 16 above the throttle valve in a known manner as a function of the rotation of the throttle valve from its fully closed position 34 to its wide open nearly vertical position, by the change in vacuum signal.
  • the carburetor also contains an idle system for supplying the necessary fuel and air to the engine cylinders during engine idling speed operation.
  • a bypass passage 26 contains the usual transfer port 28 and a discharge port 30 controlled by an adjustable needle valve 32.
  • the transfer port 28 is located in this case so that its lower edge is aligned with the edge of the throttle valve plate in its closed position 34.
  • the transfer port can be located vertically in other positions relative to the throttle plate edge when in the closed position.
  • the dotted line position 36 indicates the idle speed position of the throttle valve, while position 37 indicates a fast idle speed or engine hot start position, to be described more fully later.
  • a lever or link 38 is fixed on or formed integral with throttle valve shaft 24 for rotation with it, a tension spring 40 biasing lever 38 in a counterclockwise direction at all times to bias the throttle valve towards its closed position 34.
  • Lever 38 is adapted to be positioned clockwise to the right, as seen in the FIGURE, to locate the throttle valve clockwise to its normal idle speed position 36, or to the fast engine idle speed position 37, by a solenoid controlled stop 42.
  • the latter includes a solenoid 43 that is adjustably mounted in a bracket 44 secured to the carburetor housing 46, and has an armature 48 movable between the full line position 50 shown and the dotted line position 52, as a function of the operativeness or inoperativeness of the engine.
  • the operation of the solenoid 43 is adapted to be tied in with the engine ignition system shown schematically as including a line 54 connecting the solenoid through the engine on-off ignition switch 56 to the battery 58 having a ground connection as indicated.
  • the ignition key when turned on, for example, an electrical circuit is completed to solenoid 43 to energize the same and move armature 48 to the dotted line position 52.
  • deenergizatiori of solenoid 43 causes armature 48 to be retracted by a conventional spring, not shown, to the full line position 50 shown.
  • the dotted line position 52 of solenoid armature 48 stops the leftward movement of lever 38 at a point corresponding to the desired normal idle speed position 36 of throttle valve 22.
  • the full line position 50 permits the lever 38 to move leftwardly to the fully closed position 34 of the throttle valve.
  • linkage 60 is provided cooperating with the solenoid armature to control the position of the lever 38 for fast idle start position 37, as well as the normal idle speed position 36. More specifically, linkage 60 includes a finger-like lever 62 hinged to the solenoid case for a pivotal arcuate movement. The lever is bent near its central portion to form a bead-like abutment or cam surface 64 restable by gravity on the armature 50. A conical cam 51 fixed on armature 48 is adapted to engage and cam the lever 62 upwardly to the dotted line position 66 as the armature 48 moves from the full line to the dotted line position upon energization of the solenoid.
  • lever 62 The end 68 of lever 62 is adapted, when the armature 48 is retracted as shown, to constitute a stop by engaging lever 38 and preventing further counterclockwise movement than shown. This prevents the throttle valve 22 from closing more than to the fast idle position 37.
  • Vertical swinging movement of lever 62 when armature 48 moves rightwardly, lifts the finger end 68 out of contact with lever 38 and permits the lever to return the throttle valve 22 either to the normal idle speed position 36, or to the closed throttle speed position 34, when armature 48 is retracted.
  • the purpose of the throttle positioner is to provide three positions for emission control; namely, a starting position, in which the throttle valve is opened beyond idle position to provide a leaner start of a hot engine and yet a good start of a colder engine; secondly, a curb idle position against a solenoid armature to which the throttle valve is returned after start and during deceleration operation; and, thirdly, an engine anti-dieseling position in which the solenoid armature is retracted upon engine shutoff to permit full closure of the throttle valve, with a subsequent return to the engine start, fast idle position after a repositioning of the throttle valve by the vehicle operator.
  • the solenoid armature 48 is moved to the right to the curb idle position indicated at 52. This cams the finger lever 60 upwardly to the dotted line position 66, and permits the throttle return spring 40 now to move lever 38 and the throttle valve to the normal idle speed setting 36. Subsequent depression of the accelerator pedal and release will again return the throttle valve lever against the end of armature 48 to the curb idle speed position 36.
  • the solenoid armature 48 immediately will retract to the anti-dieseling position 50. Since the lever 38 is already to the left and under the end 68 of finger lever 62, the lever 38 now can move leftwardly with the solenoid armature to position the throttle valve 22 in the closed throttle setting 34. This reduces the fuel and air flow throughthe idle system below the level necessary to sustain, running of the engine, and, therefore prevents dieseling.
  • 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 pres sure 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 beyond normal idle speed mixture flow, and control means to move the throttle valve to and between the positions, the control means comprising a lever fixed to the throttle valve, adjustable stop means operably positionable in the path of movement of the throttle valve in a closing direction to determine the degree of closing of the throttle valve as a function of the operation
  • the first member comprising electrically actuated means connected to the engine ignition circuit so as to be responsive to engine operation and inoperation for moving the first member between its second and first positions respectively.
  • the first member comprising a solenoid connected to the engine ignition circuit and having an armature movable from the first to second positions as a function of the operativeness or inoperativeness respectively of the engine to either locate the throttle valve at an idle speed position or at a closed throttle position.
  • the second means comprising latch means engagable by the first member in response to the movement of the first member from its second to its first position to move the latch means to its second position out of the path of closing movement of the throttle valve lever to thereby permit movement of the throttle valve lever to the idle speed position.
  • the latch means comprising a pivotally mounted finger-like member located in its first position adjacent the first member, and cam means on the first member engagable with the finger-like member to cam it away from the path of closing movement of the throttle valve lever.
  • the first member comprising a solenoid moved member connected to the engine ignition circuit so as to be responsive to engine operativeness and inoperativeness to energize or deenergize the solenoid to move the member between its positions, the solenoid moved member having cam means thereon engagable with the latch means.
  • 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 beyond normal idle speed mixture flow, the control means comprising a lever fixed for rotation with the throttle valve, a solenoid connected to the engine ignition circuit so as to be responsive to engine operativeness and inoperativeness to be energized or deenergized respectively, the solenoid having an armature projecting into the path of movement

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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 Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US00202894A 1971-11-29 1971-11-29 Carburetor emission control device Expired - Lifetime US3736915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20289471A 1971-11-29 1971-11-29

Publications (1)

Publication Number Publication Date
US3736915A true US3736915A (en) 1973-06-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00202894A Expired - Lifetime US3736915A (en) 1971-11-29 1971-11-29 Carburetor emission control device

Country Status (5)

Country Link
US (1) US3736915A (ja)
JP (1) JPS5210504B2 (ja)
CA (1) CA969046A (ja)
DE (1) DE2258092A1 (ja)
GB (1) GB1400535A (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849620A (en) * 1973-06-13 1974-11-19 Lisk Savory Corp Deadman control
US4067306A (en) * 1976-06-24 1978-01-10 Acf Industries, Incorporated Solenoid operated device to control curb idle position of throttle valve
US4086900A (en) * 1976-07-19 1978-05-02 Colt Industries Operating Corporation Variable position throttle stop and dashpot apparatus
US4090481A (en) * 1975-11-29 1978-05-23 Volkswagenwerk Aktiengesellschaft Throttle closing mechanism for internal combustion engine
DE3122975A1 (de) * 1980-06-10 1982-04-15 CTS Corp., 46514 Elkhart, Ind. "verfahren und vorrichtung zur stufenweisen einstellung einer verbrennungsmotor-drehzahlsteuerung"
US20040011315A1 (en) * 2002-04-20 2004-01-22 Roland Kemmler Method for making it easier to start an internal combustion engine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177784A (en) * 1976-12-21 1979-12-11 Toyo Kogyo Co., Ltd. Engine starting device
DE3026611A1 (de) * 1980-07-14 1982-02-04 Pierburg Gmbh & Co Kg, 4040 Neuss Vorrichtung zum erzeugen eines optimierten kraftstoff-luft-gemisches
DE10326313A1 (de) * 2003-06-11 2004-12-30 Andreas Stihl Ag & Co. Kg Verbrennungsmotor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2817325A (en) * 1957-12-24 Control device for internal combustion engines
US3354877A (en) * 1966-03-25 1967-11-28 Acf Ind Inc Means for preventing auto ignition at engine shut down
US3398731A (en) * 1966-06-22 1968-08-27 Gylling & Co Ab Device for automatic control of the fuel supply to diesel engines
US3482562A (en) * 1967-12-06 1969-12-09 Gen Motors Corp Air inlet control mechanism
US3491737A (en) * 1968-03-22 1970-01-27 Ford Motor Co Throttle blade control mechanism for preventing engine dieseling
US3618582A (en) * 1969-12-04 1971-11-09 F & E Mfg Co Throttle control system
US3682148A (en) * 1971-03-04 1972-08-08 Ford Motor Co Carburetor throttle valve positioner

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2817325A (en) * 1957-12-24 Control device for internal combustion engines
US3354877A (en) * 1966-03-25 1967-11-28 Acf Ind Inc Means for preventing auto ignition at engine shut down
US3398731A (en) * 1966-06-22 1968-08-27 Gylling & Co Ab Device for automatic control of the fuel supply to diesel engines
US3482562A (en) * 1967-12-06 1969-12-09 Gen Motors Corp Air inlet control mechanism
US3491737A (en) * 1968-03-22 1970-01-27 Ford Motor Co Throttle blade control mechanism for preventing engine dieseling
US3618582A (en) * 1969-12-04 1971-11-09 F & E Mfg Co Throttle control system
US3682148A (en) * 1971-03-04 1972-08-08 Ford Motor Co Carburetor throttle valve positioner

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849620A (en) * 1973-06-13 1974-11-19 Lisk Savory Corp Deadman control
US4090481A (en) * 1975-11-29 1978-05-23 Volkswagenwerk Aktiengesellschaft Throttle closing mechanism for internal combustion engine
US4067306A (en) * 1976-06-24 1978-01-10 Acf Industries, Incorporated Solenoid operated device to control curb idle position of throttle valve
US4086900A (en) * 1976-07-19 1978-05-02 Colt Industries Operating Corporation Variable position throttle stop and dashpot apparatus
DE3122975A1 (de) * 1980-06-10 1982-04-15 CTS Corp., 46514 Elkhart, Ind. "verfahren und vorrichtung zur stufenweisen einstellung einer verbrennungsmotor-drehzahlsteuerung"
US20040011315A1 (en) * 2002-04-20 2004-01-22 Roland Kemmler Method for making it easier to start an internal combustion engine
US7040271B2 (en) * 2002-04-20 2006-05-09 Daimlerchrysler Ag Method for making it easier to start an internal combustion engine

Also Published As

Publication number Publication date
DE2258092A1 (de) 1973-05-30
CA969046A (en) 1975-06-10
GB1400535A (en) 1975-07-16
JPS4867626A (ja) 1973-09-14
JPS5210504B2 (ja) 1977-03-24

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