US3880962A - Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude - Google Patents

Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude Download PDF

Info

Publication number
US3880962A
US3880962A US346972A US34697273A US3880962A US 3880962 A US3880962 A US 3880962A US 346972 A US346972 A US 346972A US 34697273 A US34697273 A US 34697273A US 3880962 A US3880962 A US 3880962A
Authority
US
United States
Prior art keywords
fuel
venturi
flow
variable
auxiliary
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
US346972A
Other languages
English (en)
Inventor
Jerry P Rhodes
Kenneth C Bier
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.)
Coltec Industries Inc
Original Assignee
Colt Industries Operating 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 Colt Industries Operating Corp filed Critical Colt Industries Operating Corp
Priority to US346972A priority Critical patent/US3880962A/en
Priority to JP49009040A priority patent/JPS5246579B2/ja
Application granted granted Critical
Publication of US3880962A publication Critical patent/US3880962A/en
Assigned to COLT INDUSTRIES INC., A PA CORP. reassignment COLT INDUSTRIES INC., A PA CORP. MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 10/28/1986 PENNSYLVANIA Assignors: CENTRAL MOLONEY INC., A DE CORP., COLT INDUSTRIES OPERATING CORP., A DE CORP.
Assigned to COLTEC INDUSTRIES, INC. reassignment COLTEC INDUSTRIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 05/03/1990 Assignors: COLT INDUSTRIES INC.
Assigned to BANKERS TRUST COMPANY reassignment BANKERS TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COLTEC INDUSTRIES INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02M9/00—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position
    • F02M9/10—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having valves, or like controls, of elastic-wall type for controlling the passage, or for varying cross-sectional area, of fuel-air mixing chambers or of the entry passage
    • F02M9/103—Mechanical control
    • 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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
    • 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
    • Y10S261/56—Variable venturi

Definitions

  • a carburetor having an induction passage with a variable venturi and a fuel bowl has barometrically controlled variable restriction means in combination with passage means communicating between the fuel within the fuel bowl and the induction passage, vacuum generated by the variable venturi is applied to the passage means to cause a pressure differential across the fuel thereby resulting in fuel flow through the passage means, the barometrically controlled variable restriction means is effective to vary the rate of fuel flow therethrough in response to said vacuum, and additional means responsive to the opening and closing movement of said variable venturi is effective to vary the magnitude of said vacuum generated by the variable venturi.
  • the relationship sought is one where a particular mass of fuel (such as pounds of fuel per hour) is metered as to be mixed with a particular mass of air (also such as pounds of air per hour).
  • carburetors employ either a fixed or variable venturi, or some such functionally equivalent structure, within the induction passage so that as air flows therethrough a reduction in the pressure (often referred to as venturi vacuum) of the air is achieved in the vicinity of the venturi throat.
  • the value of the venturi vacuum is ofa variable magnitude generally indicative of the rate of flow of such air through the venturi.
  • the flow of air through such venturi does not necessarily indicate that the mass rate of flow of such air is constant even though the venturi vacuum generated thereby should remain constant. That is, the generated venturi vacuum is produced in response to the volume rate of air flow and not the mass rate of air flow. Consequently, as either barometric pressure changes due to atmospheric conditions or ambient pressures change due to changes in altitude, the volume rate of air flow may in fact remain constant but such a volume rate of air flow will represent differing values of mass rate of air flow as between two different atmospheric pressures. For example, while driving through the mountains a volume rate of flow of air developing the same venturi vacuum as previously experienced at, for example, sea level, will actually represent a lesser mass rate of flow of air because of the decrease in density of the air in such higher altitudes.
  • variable venturi carburetor While the invention is shown as embodied in a variable venturi carburetor, the invention or certain features thereof may be equally applicable to other carburetor types, such as certain air valve type carburetors.
  • Apparatus for carrying out the above inventive method may be described as a carburetor for an internal combustion engine, comprising a carburetor body, induction passage means formed through said body for communication with said engine, variable venturi means situated in said induction passage means effective for defining a variably openable venturi throat, a fuel reservoir, ambient pressure controlled variable restriction means in combination with auxiliary passage means communicating between the fuel within said fuel reservoir and said induction passage means, said auxiliary passage means communicating with a source of vacuum generated by the flow of air through said variably openable venturi throat as to thereby cause a pressure differential across said fuel resulting in the flow of auxiliary fuel through said auxiliary passage means, said ambient pressure controlled variable restriction means being effective to vary the rate of flow of said auxiliary fuel through said auxiliary passage means in response to the magnitude of said vacuum, and additional means responsive to the opening and closing movement of said variably openable venturi throat for varying the effective magnitude of said vacuum communicated to said auxiliary passage means.
  • FIG. 1 illustrates, in cross-section, a variable venturi carburetor constructed in accordance with the teachings of the invention.
  • FIG. 2 is a graph illustrating characteristic fuel flow curves of prior art structures and of the invention.
  • FIG. 1 illustrates a carburetor assembly having a body or housing means 12 with an induction passage 14 formed therethrough with such induction passage 14 having an inlet end 16 and an outlet or discharge end 18 leading to an inlet 22 of the interior 24 of an intake manifold 26 of an associated internal combustion engine.
  • a vari ably positionable throttle valve 28, mounted as for rotation on a throttle shaft 30, is situated within the induction passage and effective for controlling the flow of a motive or combustible mixture from said induction passage 14 into the intake passage 24 of engine manifold 26.
  • combustible mixture will, of course, be comprised of atmospheric air admitted into inlet end 16 and fuel supplied to the induction passage 14 from an associated fuel reservoir or fuel bowl assembly 32.
  • the fuel bowl assembly 32 is illustrated as comprising a suitable bowl or housing structure 34 which may contain a float member 36 controlling an associated fuel inlet needle valve assembly (not shown but well known in the art) so as to maintain the level of the fuel 38 within the bowl 34 at a preselected level as at 40.
  • the interior 39 of the fuel bowl may be vented to the atmosphere as by vent means 41.
  • the related fuel metering means is shown as comprising a fuel well or conduit 44 with the lower end thereof being in communication with the fuel 38 as at 46.
  • Conduit 44 leads to a fuel discharge conduit or nozzle-like portion 48 which communicates with the induction passage 14 as at an outlet or discharge orifice 50.
  • the discharge orifice 50 is located as to be just below or downstream of the throat of a variable venturi arrangement as by having such opening formed in the fixed wall or fixed half 52 of the variable venturi.
  • variable venturi may be comprised of a variably positionable venturi plate 54 which may be fixedly secured to a rotatable shaft 62 journalled in the housing means 12.
  • the venturi arrangement may be such as to define a generally rectangular opening at the throat of the variable venturi when viewed, for example, in the direction of arrow 64.
  • opposite walls one of which is shown at 66, may define fiat planar surfaces permitting the variable or movable venturi plate 54 to be closely received therebetween for swingable motion about the centerline of rod or shaft 62.
  • fiat planar surfaces would terminate as at a boundary line 68 from which the continuing portion of the induction passage means 14 downstream thereof would transitionally change configuration until it became circular to accommodate the throttle valve 28.
  • a lever 70 is fixedly secured at one end to shaft 62, for rotation therewith, and has its swingable arm portion connected as to a linkage rod 72 leading to a throttle valve actuating lever 74 fixedly secured to throttle shaft 30.
  • Throttle actuating lever 74 is, in turn, connected as by linkage means 76 leading to a vehicle operator foot-controlled throttle pedal 78 which may be mounted for pivotal rotation as at a pivot 80.
  • throttle pedal 78 is rotated clockwise about pivot 80, throttle valve 28 is moved counter-clockwise in the opening direction about the centerline of shaft 30.
  • movable venturi plate 54 is rotated counter-clockwise about the axis of shaft 62 thereby increasing the opening of the throat of the variable venturi as depicted by the dimension, D.
  • a metering rod or valve 82 having a metering surface 84, is correspondingly moved toward and away from a cooperating metering orifice as provided by the restriction depicted at 86.
  • rod 82 which may be suitably pivotally connected to the venturi plate 54 as within a recess 88, moves toward restriction 86, the coaction of metering surface 84 and orifice member 86 results in a reduced effective flow area thereby correspondingly reducing the rate of flow of fuel supplied through conduits 44 and 48 and into induction passage 14.
  • FIG. 1 also illustrates, as being formed within housing means 12, a passage or conduit 90 having a member 92 situated therein and defining an orifice 94.
  • a member 96 situated within a chamber 98, divides the chamber 98 generally into portions or conduit sections 100 and 102 with communication therebetween being established through an orifice 104 formed in member 96.
  • a first interconnecting conduit or passage means 106 serves to complete communication between conduit 90 and conduit portion 102.
  • a discharge or delivery conduit 108 has one end in communication with conduit section 102 and its other end terminating in a discharge orifice 1 10 opening into the induction passage 14, preferably, at a point downstream of the throat of the variable venturi.
  • discharge orifices 50 and 110 are illustrated as being at different elevational levels, it should be apparent that such may in fact be at identical levels.
  • venturi plate 43 is moved as to increase the throat dimension, D, rod 1 12 is moved to the left causing the effective flow area, defined between metering surface 114 and orifice 94, to decrease.
  • a second valving member 120 having a body 122 slidably received within chamber 98, has a contoured metering surface 124 which, as shown, is adapted to coact with orifice 104 to define an effective flow area therebetween.
  • Chamber 98 may be closed as by a wall member 126 which permits the slideable passage therethrough of an extension portion 128 of valve member 120.
  • Altitude or barometric pressure responsive means such as an evacuated bellows means 130 having body means 132 resiliently urged toward a direction of elongation, is suitably secured as through the stem or linkage 128 to valving means 120.
  • the other end of body 132 may be suitably secured as to a support 134.
  • bellows 130 will move valve means 120 toward the right causing valving portion 124 to more nearly close the effective flow area through orifice 104 and thereby increasingly restrict the communication from passage means 102 to passage or chamber means 100 which, in turn, communicates with the fuel 38 via conduit means 136 extending into the fuel 38.
  • variable venturi throat, D is increasingly opened to provide a greater flow area for the air passing through the induction passage.
  • Venturi vacuum generated by the velocity rate of air flowing through the venturi throat, isemployed in creating a metering depression or pressure differential across the fuel 38 and orifice 50 thereby causing fuel flow the main or primary fuel delivery system comprised of conduit means 44, 48 and effective orifice or flow area of orifice member 86 as determined by the contoured metering surface 84 of metering rod 82.
  • the main fuel delivery system will function to provide a particular fuel flow curve which may be determined by, for example, plotting the value of the fuel-air ratio (with both fuel and air being measured in pounds) against the corresponding mass rate of air flow (measured in terms of pounds per hour).
  • the main fuel delivery system is capable of maintaining any such selected performance curves.
  • a characteristic or typical fuel flow curve of such a prior art carburetor is generally illustrated as at 140 of FIG. 2.
  • the invention provides what may be referred to as a second compensating fuel delivery system, generally parallel to the primary or main fuel delivery system, comprised of conduit means 108, 102, 106, 90, 104, and 136.
  • a compensating fuel delivery system is adapted to provide for a metered fuel flow, discharged as at a nozzle or discharge orifice 110, which is controlled so that the quantity of fuel supplied thereby when added to the fuel supplied by the main fuel supply system will result in a fuel flow required to produce the desired fuel-air ratio (based on pounds of fuel and pounds of air) regardless of variations in air density caused by variations in ambient atmospheric pressures.
  • the rate of metered compensating fuel will be controlled and determined by the action of valving means comprised of apertures 104 and 94' respectively co-acting with metering surfaces 124 and 114.
  • bellows 130 will be a maximum contracted condition causing valving member 120 to move to the left to some corresponding position as against wall' member 126. Consequently, because of the movement of metering surface 124 to the left, the effective flow area through orifice 104 is at a maximum.
  • the air flowing through the venturi throat at this time is providing a metering or venturi vacuum for causing fuel to be metered and discharged from orifice 50', additionally, the same air-flow-generated venturi vacuum is applied to the parallel compensating fuel system via port and conduit means 108.
  • Such reduced pressure or venturi vacuum is further communicated to passage means 102, through orifice means 104, chamber portion 100 and conduit 136 to the fuel contained therein.
  • passages 106 and 90 communicating between a source of ambient atmospheric pressure and passage or conduit means 102.
  • Such communication with the ambient permits a degree of atmospheric pressure to be bled into passage means 102 with the degree of such bleed being determined by the effective flow area through orifice 94.
  • the modified venturi vacuum applied to the fuel within conduit means 136 causes compensating fuel to flow upwardly through conduit 136, chamber portion 100, orifice 104, passage means 102, conduit means 108 and out of orifice or port 110 into the induction passage 14.
  • the rate of flow of such additional fuel will depend on the pressure differential created across the fuel within conduit 136 by the modified venturi vacuum as well as the effective flow area through orifice 104. Consequently, it should be apparent that as ambient pressure decreases bellows 130 will correspondingly lengthen and valve means will be correspondingly moved to the right resulting in metering surface 124 further restricting the effective flow area through orifice means 104.
  • one of the variables in determining the rate of flow of fuel through the auxiliary or compensating fuel delivery system is the effective area of orifice means 104, a reduction in the rate of flow of compensating or auxiliary fuel is experienced.
  • venturi plate 54 is also moved in an opening direction thereby simultaneously increasing the effective flow area through restriction 86 of the main metering system, thereby increasing the rate of metered fuel-flow therethrough, and decreasing the effective flow are a through orifice means 94.
  • the reduction of the effective flow area through orifice means 94 causes a reduction in the degree of atmospheric bleed therethrough so as to result in a greater percentage of the then generated venturi vacuum to be applied to the compensating or auxiliary fuel system. This, of course, assures the availability of a sufficient rate of flow of auxiliary fuel to maintain the desired fuel-air ratio.
  • the carburetor of the invention will continue to provide a fuel flow curve of specified fuelair ratios, as generally depicted at 142 of FIG. 2, and not the overly fuel-rich fuel-air ratios of the prior art as depicted at 140 of FIG. 2.
  • the pressure responsive valving means 120 is effective for determining a family of compensating fuel flow curves (independent of the fuel flow curves developed by the main fuel supply system) while the air bleed means 94, 114, responsive generally to air flow demands of the engine, is effective for determining or altering the shape of such family of compensating or auxiliary fuel flow curves.
  • curve 142 may be of any desired configuration suitable for the particular requirements of any associated engine.
  • a carburetor for an internal combustion engine comprising a carburetor body, induction passage means formed through said body for communication with said engine, variable venturi means situated in said induction passage means effective for defining a vari ably openable venturi throat, a fuel reservoir, main fuel delivery means including fuel metering means communicating between the interior of said fuel reservoir and said induction passage means, said main fuel metering means being effective to meter the rate of fuel flow from said fuel reservoir through said fuel delivery means and into said induction passage means in accordance with the rate of air flow through said variable venturi means, variable restriction means in combination with auxiliary passage means communicating between the fuel within said fuel reservoir and said induction passage means, said auxiliary passage means communicating with a source of vacuum generated by the flow of air through said variably openable venturi throat as to thereby cause a pressure differential across said fuel resulting in the flow of auxiliary fuel through said auxiliary passage means, first additional pressure responsive means operatively connected to said variable restriction means to make said variable restriction means effective to vary generally in accordance with a parameter of ambient atmospheric
  • variable restriction means is situated generally in said auxiliary passage means and comprises aperture means of fixed dimensions cooperating with a variably positionable valving member.
  • variable restriction means is situated generally in said auxiliary passage means and comprises an aperture of fixed dimensions cooperating with a variably positionable valving member for variably controlling the effective flow area of said aperture, and wherein said first additional pressure responsive means is operatively connected to said valving member.
  • a carburetor according to claim 2 wherein said second additional means comprises variable venting means operatively communicating between said auxiliary passage means and a source of substantially'atmoating with movable valving means, said movable valvspheric pressure. ing means being effective to vary the effective flow area 8.
  • venting means comprises fixed aperture means cooper-

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)
US346972A 1973-04-02 1973-04-02 Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude Expired - Lifetime US3880962A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US346972A US3880962A (en) 1973-04-02 1973-04-02 Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude
JP49009040A JPS5246579B2 (OSRAM) 1973-04-02 1974-01-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US346972A US3880962A (en) 1973-04-02 1973-04-02 Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude

Publications (1)

Publication Number Publication Date
US3880962A true US3880962A (en) 1975-04-29

Family

ID=23361806

Family Applications (1)

Application Number Title Priority Date Filing Date
US346972A Expired - Lifetime US3880962A (en) 1973-04-02 1973-04-02 Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude

Country Status (2)

Country Link
US (1) US3880962A (OSRAM)
JP (1) JPS5246579B2 (OSRAM)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002441A (en) * 1975-03-21 1977-01-11 Willard Lewis Johnson Wash section for air-cleaning device
US4005161A (en) * 1974-02-22 1977-01-25 Hitachi, Ltd. Variable stage type carburetor
US4060064A (en) * 1975-03-20 1977-11-29 Nissan Motor Company, Limited Variable size venturi carburetor with an electronic air/fuel ratio control system
DE3131592A1 (de) * 1981-08-10 1983-02-24 Volkswagenwerk Ag, 3180 Wolfsburg Vergaser fuer brennkraftmaschinen
WO1987006305A1 (en) * 1986-04-17 1987-10-22 Ting Hui Tzeng Induction type carburetor of movable venturi
US6702262B2 (en) * 2001-03-15 2004-03-09 Zama Japan Fuel system of carburetor

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2084489A (en) * 1933-09-06 1937-06-22 Hess Harry Weir Carburetor
US2100676A (en) * 1933-03-23 1937-11-30 Homer A Trussell Fuel system for combustion engines
US2195867A (en) * 1937-04-14 1940-04-02 Mallory Marion Carburetor
US2227267A (en) * 1937-09-01 1940-12-31 Zenith Carburateurs Soc Gen Carburetor
US3107266A (en) * 1962-04-30 1963-10-15 Ora E Wilson Carburetor
US3271014A (en) * 1963-12-27 1966-09-06 Ford Motor Co Altitude compensated charge forming device
US3285585A (en) * 1964-01-03 1966-11-15 Sibe Carburetting devices for internal combustion engines
US3322408A (en) * 1965-09-01 1967-05-30 Gen Motors Corp Carburetor
US3575390A (en) * 1968-05-24 1971-04-20 Acf Ind Inc Carburetion
US3721428A (en) * 1970-11-20 1973-03-20 P Gele Constant negative-pressure carburettors

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2100676A (en) * 1933-03-23 1937-11-30 Homer A Trussell Fuel system for combustion engines
US2084489A (en) * 1933-09-06 1937-06-22 Hess Harry Weir Carburetor
US2195867A (en) * 1937-04-14 1940-04-02 Mallory Marion Carburetor
US2227267A (en) * 1937-09-01 1940-12-31 Zenith Carburateurs Soc Gen Carburetor
US3107266A (en) * 1962-04-30 1963-10-15 Ora E Wilson Carburetor
US3271014A (en) * 1963-12-27 1966-09-06 Ford Motor Co Altitude compensated charge forming device
US3285585A (en) * 1964-01-03 1966-11-15 Sibe Carburetting devices for internal combustion engines
US3322408A (en) * 1965-09-01 1967-05-30 Gen Motors Corp Carburetor
US3575390A (en) * 1968-05-24 1971-04-20 Acf Ind Inc Carburetion
US3721428A (en) * 1970-11-20 1973-03-20 P Gele Constant negative-pressure carburettors

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005161A (en) * 1974-02-22 1977-01-25 Hitachi, Ltd. Variable stage type carburetor
US4060064A (en) * 1975-03-20 1977-11-29 Nissan Motor Company, Limited Variable size venturi carburetor with an electronic air/fuel ratio control system
US4002441A (en) * 1975-03-21 1977-01-11 Willard Lewis Johnson Wash section for air-cleaning device
DE3131592A1 (de) * 1981-08-10 1983-02-24 Volkswagenwerk Ag, 3180 Wolfsburg Vergaser fuer brennkraftmaschinen
WO1987006305A1 (en) * 1986-04-17 1987-10-22 Ting Hui Tzeng Induction type carburetor of movable venturi
US6702262B2 (en) * 2001-03-15 2004-03-09 Zama Japan Fuel system of carburetor
US20040075180A1 (en) * 2001-03-15 2004-04-22 Zama Japan Fuel system of carburetor
US6845972B2 (en) 2001-03-15 2005-01-25 Zama Japan Fuel system of carburetor
US20050062176A1 (en) * 2001-03-15 2005-03-24 Zama Japan Fuel system of carburetor

Also Published As

Publication number Publication date
JPS49128136A (OSRAM) 1974-12-07
JPS5246579B2 (OSRAM) 1977-11-25

Similar Documents

Publication Publication Date Title
US3493217A (en) Carburettors
US3906910A (en) Carburetor with feedback means and system
US3322408A (en) Carburetor
US2996051A (en) Carburetor
US3313532A (en) Anti-smog device
US4453523A (en) Pressure balanced flow regulator for gaseous fuel engine
US4357283A (en) Carburetor
US3362694A (en) Carburetor
US3544083A (en) Carburetor
US3859397A (en) Carburetor altitude compensation assembly
US3836128A (en) Carburetor ambient mixture control
US2477481A (en) Antidetonating device
US2680605A (en) Carburetor
US3968189A (en) Method and apparatus for varying fuel flow from a variable venturi carburetor to compensate for changes in barometric pressure and altitude
US3669424A (en) Carburetor of variable-area venturi type
US3880962A (en) Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude
US4089308A (en) Carburation devices
US3937768A (en) Variable venturi carburetor
US3350073A (en) Carburetor
US3831910A (en) Carburetors
US4341723A (en) Variable venturi carburetor
US3672339A (en) Fuel injection apparatus
US3753555A (en) Carburetors
US2649290A (en) Carburetor
US3198497A (en) Carburetors for internal combustion engines

Legal Events

Date Code Title Description
AS Assignment

Owner name: COLTEC INDUSTRIES, INC.

Free format text: CHANGE OF NAME;ASSIGNOR:COLT INDUSTRIES INC.;REEL/FRAME:006144/0197

Effective date: 19900503

Owner name: COLT INDUSTRIES INC., A PA CORP.

Free format text: MERGER;ASSIGNORS:COLT INDUSTRIES OPERATING CORP., A DE CORP.;CENTRAL MOLONEY INC., A DE CORP.;REEL/FRAME:006144/0236

Effective date: 19861009

AS Assignment

Owner name: BANKERS TRUST COMPANY, NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:COLTEC INDUSTRIES INC.;REEL/FRAME:006080/0224

Effective date: 19920401