US3916020A - System for controlling pressure by acoustic means - Google Patents

System for controlling pressure by acoustic means Download PDF

Info

Publication number
US3916020A
US3916020A US361064A US36106473A US3916020A US 3916020 A US3916020 A US 3916020A US 361064 A US361064 A US 361064A US 36106473 A US36106473 A US 36106473A US 3916020 A US3916020 A US 3916020A
Authority
US
United States
Prior art keywords
conduit
pressure
float chamber
flow
chamber
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
US361064A
Other languages
English (en)
Inventor
Jean Malphettes
Pierre Fontanet
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Application granted granted Critical
Publication of US3916020A publication Critical patent/US3916020A/en
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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/10—Other installations, without moving parts, for influencing fuel/air ratio, e.g. electrical means
    • F02M7/11—Altering float-chamber pressure
    • 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
    • F02M5/00—Float-controlled apparatus for maintaining a constant fuel level
    • F02M5/08—Float-controlled apparatus for maintaining a constant fuel level having means for venting float chambers
    • 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
    • Y10S261/67—Carburetors with vented bowl

Definitions

  • This invention relates to a method and apparatus for controlling pressure in containers from a periodic acoustic source.
  • This invention utilizes the periodic acoustic phenom ena produced by these engines or other acoustic sources to control the pressure in containers where it is required to effect a pressure correction.
  • the static positive or negative pressure increases rapidly with the alternating acoustic pressure and depends generally on the geometric features of the container system, the value of the ratio of the pressure loss coefficients, and the frequency of the alternating acoustic pressure of the periodic source.
  • a pressure control is effected in a container, such as the float chamber of an internal combustion engine carburetor, from a periodic acoustic source by connecting the container to the acoustic source by means of a conduit constructed so that the pressure losses differ according to the direction of flow through the conduit.
  • conduit used in this invention is constructed so that the ratio of the pressure loss coefficients in one direction and the other direction is dif ferent from 1 so that the alternating acoustic pressure passing through the conduit and originating from the periodic acoustic source produces a static positive or negative pressure inside the container depending upon the value other than I of the said ratio.
  • a further object of this invention resides in providing a system for controlling pressure in a container from a periodic acoustic source by means of a conduit connecting the container to the acoustic source and so designed that the pressure losses inside the conduit differ according to the direction of flow inside the conduit.
  • Another object of this invention is to provide a control conduit for the system of the preceding object wherein the interior of the conduit comprises at least one air jet of the venturi type.
  • Still another object of this invention is to provide a control conduit, the inner wall of which comprises a series of steps of different diameters thus producing a very appreciable pressure loss in one direction and a small pressure loss in the other direction.
  • FIG. I is a diagrammatic section showing a first embodiment of the invention connecting a carburetor float chamber venting system to the intake of an inter nal combustion engine;
  • FIG. 2 is a diagrammatic section of a second embodiment of the invention connecting a carberetor float chamber venting system to the exhaust of an internal combustion engine.
  • the air inlet passage 1 and its associated venturi 2 are connected at one end to the air filter 3, of the periodic acoustic sources of an internal combustion engine, and at its other end to the intake manifold of the engine.
  • the chamber 4, the float chamber of the carburetor, communicates with the jet 5 through the supply passage 6, the jet 5 discharging at the constricted section of the air passage 1.
  • the top part of chamber 4 is connected directly to the interior of air filter 3 by a smooth tube 7 containing two air jets 8 and 9 of the venturi type. Jets 8 and 9 are oriented in tube 7 in such a manner that the pressure loss coefficient for a flow of gas (air in this instance) through conduit 7 and jets 8 and 9 in the direction of chamber 4 is less than the pressure loss coefficient of a flow of the same gas through conduit 7 and jets 8 and 9 in the reverse direction from chamber 4 to the air filter 3.
  • the ratio of the pressure loss coefficient in the direction of the acoustic source 3 to the pressure loss coefficient in the direction of chamber 4 is, therefore, greater than unity in the case of FIG. 1.
  • the assembly enables the intake resonance effects which would normally result in a mixture richness minimum, which is required to be limited, are counteracted.
  • the correction provided by this invention is at all times proportional to the error, since the latter is a function of the amplitude of the alternating pressure which itself modulates the value of the correction.
  • the disclosed and claimed invention is the creation of a static pressure within a defined, closed space by connection of a conduit to a source of acoustic, dynamic pulsed pressure outside the space, the conduit having assymetric pressure loss characteristics, that is to say different pressure loss coefficients dependent on direction of flow through the conduit.
  • the lid of float chamber 4 includes a conduit machined to provide a series of diameters 11a, llb, and 110 which increase in the outward direction.
  • the venting conduit 11 fitted into the largest and outermost diameter 11c,
  • a periodic acoustic source may be connected through a flexible tube 12 to a point of the engine where a periodic acoustic source occurs, for example the engine intake or exhaust or any suit able component where the alternating pressure varies according to engine speed.
  • the ratio of the pressure loss coefficient in the direction of the acoustic source to the pressure loss coefficient in the direction of chamber 4 is greater than unity and the periodic pressure waves produce a positive pressure in chamber 4 so that the rate of flow of fuel is increased.
  • the system and method of controlling pressure in a container in accordance with this invention may be used as illustrated particularly in the case of internal combustion engines to obviate the disadvantages due to intake resonance which may produce a richness maximum or a richness minimum in the air-fuel mixture.
  • the system according to the invention may also be used to modify the slope ofa richness curve over a wide operating range. If it is found in a given engine that the mixture richness is excessive over an appreciable range, for example at low engine speeds, the pressure loss in the float venting conduit may be so devised as to produce a negative pressure in the carburetor float chamber, this having the effect of compensating for the excess richness.
  • the alternating acoustic source will preferably be a component of the engine where the alternating pressure varies only slightly according to engine speed. In this way the negative pressure produced in the carburetor float chamber by means of the system according to the invention will be practically constant irrespective of engine speed.
  • the compensating effect of the system according to the invention will decrease when the speed increases, and in this way it will be possible regularly to reduce the richness of the mixture at low speeds, while retaining the engine operation unchanged at higher speeds.
  • the system and the method according to the invention are of particularly advantageous application in controlling carburetion in internal combustion engines and particularly in the carburetor float chamber venting conduits.
  • the invention may also be used wherever it is required to carry out pressure control in a container and it is possible to use a periodic acoustic source.
  • a method of correcting carburetion errors in internal combustion engines comprising the steps of venting the carburetor float chamber through a conduit whose pressure loss coefficient is different depending upon the direction of flow in the conduit and connecting the conduit to vent the flow chamber to a periodic acoustic source of the engine to establish a preselected static pressure in the float chamber in accord with the direction of flow through the conduit.
  • venting conduit is connected to establish a positive static pressure in the float chamber.
  • venting conduit is connected to establish a negative static pressure in the float chamber.
  • Apparatus for correcting carburetion errors in internal combustion engines comprising a carburetor including a float chamber and an intake passage containing a venturi tube. a fuel supply passage leading from said float chamber to said intake passage. a venturi jet disposed in said intake passage to receive the fuel supplied through said fuel supply passage and deliver the received fuel to the restricted area of said venturi tube. an air filter connected to the intake end of said intake passage. and conduit means interconnecting said float chamber and said air filter. said conduit means having a pressure loss coefficient in one direction of flow different from the pressure loss coefficient in the other direction of flow to establish a preselected static pressure in said float chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Pipe Accessories (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US361064A 1972-05-29 1973-05-17 System for controlling pressure by acoustic means Expired - Lifetime US3916020A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7219147A FR2187144A5 (ru) 1972-05-29 1972-05-29

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/584,936 Division US4020859A (en) 1972-05-29 1975-06-09 System for controlling pressure by acoustic means

Publications (1)

Publication Number Publication Date
US3916020A true US3916020A (en) 1975-10-28

Family

ID=9099240

Family Applications (1)

Application Number Title Priority Date Filing Date
US361064A Expired - Lifetime US3916020A (en) 1972-05-29 1973-05-17 System for controlling pressure by acoustic means

Country Status (6)

Country Link
US (1) US3916020A (ru)
JP (1) JPS5224607B2 (ru)
DE (1) DE2323204C2 (ru)
FR (1) FR2187144A5 (ru)
GB (1) GB1432461A (ru)
IT (1) IT987631B (ru)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092380A (en) * 1976-06-17 1978-05-30 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburetors for internal combustion engines
US4230646A (en) * 1978-01-30 1980-10-28 Aquascooter, Inc. Carburetor device
US4478764A (en) * 1982-03-04 1984-10-23 Toyota Jidoshi Kabushiki Kaisha Air valve type carburetor
US4726328A (en) * 1985-08-14 1988-02-23 Yamaha Hatsudoki Kabushiki Kaisha Induction system for vehicle powered by an air propeller
US20090197715A1 (en) * 2008-02-01 2009-08-06 Tai-Her Yang Continuous variable transmission device with high shift transmission pulley train

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS588933Y2 (ja) * 1976-04-19 1983-02-17 ヤマハ発動機株式会社 水平通風式キャブレタ−
FR2425668A2 (fr) * 1978-05-09 1979-12-07 Renault Dispositif de reglage de pression par moyens acoustiques
FR2456219A1 (fr) * 1979-05-11 1980-12-05 Sibe Perfectionnements aux carburateurs pour moteurs a combustion interne
DE4334702A1 (de) * 1993-10-12 1995-04-13 Opel Adam Ag Entlüftungseinrichtung einer Brennkraftmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732835A (en) * 1956-01-31 Ultrasonic

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7039255U (de) * 1971-08-19 S I B E Vergaser fur Verbrennungsmotoren
FR528839A (fr) * 1920-12-20 1921-11-19 Ernest Marie Edmond Jean De Ve Perfectionnement aux carburateurs pour moteurs à explosions
FR787445A (fr) * 1934-03-16 1935-09-23 Dispositif pour le démarrage et l'actionnement du moteur froid de véhicules automobiles et avions
DE689838C (de) * 1938-01-15 1940-04-05 Alwin Duesterloh Dipl Ing Spritzvergaser mit Schwimmerkammerregelung
US2793634A (en) * 1951-04-02 1957-05-28 Acf Ind Inc Automatic starting device
FR1076981A (fr) * 1953-02-14 1954-11-03 App Control Equip Moteurs Perfectionnements apportés aux dispositifs de carburation pour moteurs à explosions, notamment à ceux pour moteurs de véhicules automobiles
GB1188783A (en) * 1968-07-27 1970-04-22 Ford Motor Co Carburettor.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732835A (en) * 1956-01-31 Ultrasonic

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092380A (en) * 1976-06-17 1978-05-30 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburetors for internal combustion engines
US4230646A (en) * 1978-01-30 1980-10-28 Aquascooter, Inc. Carburetor device
US4478764A (en) * 1982-03-04 1984-10-23 Toyota Jidoshi Kabushiki Kaisha Air valve type carburetor
US4726328A (en) * 1985-08-14 1988-02-23 Yamaha Hatsudoki Kabushiki Kaisha Induction system for vehicle powered by an air propeller
US20090197715A1 (en) * 2008-02-01 2009-08-06 Tai-Her Yang Continuous variable transmission device with high shift transmission pulley train
US8888618B2 (en) * 2008-02-01 2014-11-18 Tai-Her Yang Continuous variable transmission device with high shift transmission pulley train

Also Published As

Publication number Publication date
JPS5224607B2 (ru) 1977-07-02
FR2187144A5 (ru) 1974-01-11
DE2323204A1 (de) 1973-12-20
GB1432461A (en) 1976-04-14
IT987631B (it) 1975-03-20
DE2323204C2 (de) 1981-10-01
JPS4954728A (ru) 1974-05-28

Similar Documents

Publication Publication Date Title
US4016837A (en) Vapor intake system for internal combustion engines
US3916020A (en) System for controlling pressure by acoustic means
NZ218859A (en) Regulation of ratio of gaseous fuel and air mass flow rates in i.c. engine
GB2100797A (en) Duplex carburetor and intake system for internal combustion engines
US4112898A (en) Internal combustion engine with charcoal canister
JPS5596350A (en) Method of controlling internal combustion engine in terms of numerous variables
US3963011A (en) Method and device for adjusting engine exhaust gas recirculation control
GB1396149A (en) Internal combustion engine with control of the carburetor idling system
US3990414A (en) Intake passages of internal combustion engines
GB1507058A (en) Internal combustion engine having an intake manifold pressure regulator
US5460149A (en) Carburetor kit for improved air-fuel mixture
US11203991B2 (en) Gas control system and gas control method of off-road gas engine
JPS5525533A (en) Air intake apparatus of multicylinder internal combustion engine
US4020859A (en) System for controlling pressure by acoustic means
US3326539A (en) Carburetor
GB769041A (en) Improvements in induction pipes for internal combustion engines
ES459290A1 (es) Perfeccionamientos en los carburadores para motores de com- bustion interna.
US3873650A (en) Carburetor
US3880962A (en) Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude
US2576475A (en) Internal-combustion engine carburetion system
GB1516953A (en) Flow rate control apparatus in an exhaust gas recirculation system of an internal combustion engine
US5299551A (en) Carburetor kit for improved air-fuel mixture
JPS54150512A (en) Carbureter
JPS53140420A (en) Engine combustion controller for automobile
US1326378A (en) Intake-pipe or manifold for internal-combustion engines or the like.