EP0331574A1 - Vorrichtung zur Aufbereitung und zur Verteilung eines Brennstoff-Luft-Gemisches für eine Otto-Brennkraftmaschine - Google Patents

Vorrichtung zur Aufbereitung und zur Verteilung eines Brennstoff-Luft-Gemisches für eine Otto-Brennkraftmaschine Download PDF

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Publication number
EP0331574A1
EP0331574A1 EP89400548A EP89400548A EP0331574A1 EP 0331574 A1 EP0331574 A1 EP 0331574A1 EP 89400548 A EP89400548 A EP 89400548A EP 89400548 A EP89400548 A EP 89400548A EP 0331574 A1 EP0331574 A1 EP 0331574A1
Authority
EP
European Patent Office
Prior art keywords
cam
nozzle
venturi tube
stepping motor
distributing
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.)
Withdrawn
Application number
EP89400548A
Other languages
English (en)
French (fr)
Inventor
Xavier Aubin
François Cliville
Patrick Gastaldi
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
Regie Nationale des Usines Renault
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, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0331574A1 publication Critical patent/EP0331574A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F02M7/18—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel-metering orifice
    • 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
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/02—Floatless carburettors
    • F02M17/06—Floatless carburettors having overflow chamber determining constant fuel level
    • 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
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/08—Venturis
    • F02M19/10—Venturis in multiple arrangement, e.g. arranged in series, fixed, arranged radially offset with respect to each other

Definitions

  • the present invention relates to a device for preparing and distributing a fuel mixture intended for a spark-ignition engine.
  • Its purpose is to propose a system which makes it possible to control the fuel flow at constant air flow, so that the richness of the mixture becomes an active parameter of the operation of the engine and not a consequence of other adjustments.
  • a device of the type comprising in particular a main venturi tube and a butterfly controlled by a stepping motor which, according to an essential characteristic, incorporates: - an auxiliary venturi tube for the fuel mixture supply, - an overflow tank, - a calibrated nozzle, - a cam closing all or part of the nozzle, - And a stepping motor for the control of this cam.
  • this overflow tank is connected to a fuel tank by a return pipe, and to the atmosphere by a vent pipe.
  • Fuel flow control is thus made possible at any engine operating point, which provides flexibility of using a single-point injector at a much lower cost.
  • the preferred device comprises in particular: - a main venturi tube 1, - an auxiliary venturi tube 2 conveying a fuel mixture, - an overflow tank 3 connected to the reservoir by a return pipe 7 and to the atmosphere by a pipe 9 for venting to the open air, - a calibrated nozzle 4, a cam 5 closing all or part of the nozzle 4, - a stepper motor 6, - And a throttle valve 8 controlled by a stepping motor.
  • the venturi tube 1 is dimensioned so as to provide a maximum air flow demanded by the engine. It conveys clean air.
  • the venturi tube 2 supplies the carburetted air to the engine. Its arrangement with respect to the tube 1 is defined by the angles ⁇ , ⁇ and the dimension x defined in FIGS. 1 and 3, the values of which are variable. Its size also varies depending on the engine.
  • the overflow tank 3 is supplied by a fuel pump.
  • the return to the tank takes place via the pipe 7, the venting through the pipe 9.
  • the nozzle 4 has a section calculated so as to provide the maximum fuel flow admitted by the engine.
  • the geometrical shape of its channel can be circular, elliptical, rectangular and it can penetrate or not inside the tube 2 (dimension y variable - figure 1).
  • the end of the nozzle on the tube side 2 can be bevelled or straight, and the projecting part in this tube can have a wall pierced radially with small diameter holes.
  • the pipe channel of the nozzle may consist over all or part of its length of a fine lattice or of a set of capillaries.
  • the cam 5 which is activated in rotation by the stepping motor 6 closes all or part of the free section of the nozzle 4.
  • Various mechanical systems, numerous respective arrangements of parts 4, 5 and 6 and multiple shapes relating to the surfaces in contact with parts 4 and 5 are possible.
  • FIGS 4A and 4B, 5, 6A and 6B illustrate three examples of assembly of these parts.
  • FIG. 5 is illustrated an "eccentric" arrangement where point A represents the center of rotation of a circular cam 5 (axis of the stepping motor 6), the arc B the location of the centers of this cam, the points m and n two distinct positions of the center of this cam for which the passage of the nozzle 4 is respectively closed and uncovered.
  • the passage section of the nozzle varies as a function of the angle of inclination ⁇ .
  • the stepping motor 6 can be placed either inside the tank at a constant level 3, or outside the carburetor.
  • the throttle valve 8 controlled by a not shown stepping motor can be arranged upstream or downstream of the venturi neck 1.
  • This pressure P col 1, lower than atmospheric pressure P atm, generates a flow rate Q3 and a pressure at the neck P col 2 in the venturi 2.
  • the metering of the admitted fuel no longer depends only on the level of the tank 3 and the section of the nozzle 4 delivering at the level of the neck 2.
  • Maintaining the unit richness in the event of a three-way catalysis or optimizing it in lean mixture type operation can thus be carried out (cf. single-point injection).
  • the displacement of the cam regulates the fuel flow.
  • the emulsion tube of the conventional carburetor is eliminated.
  • the constant level tank is not necessary.
  • the appropriate positions of the cam adjust the fuel flow.
  • the auxiliary circuits corresponding to these functions in the conventional carburetor are eliminated.
  • the reduced fuel path between the tank and the venturi 2 reduces the inertial effects during acceleration.
  • a deceleration cut is possible by completely blocking the nozzle.
  • the throttle motor allows a stable position at idle and dispenses with the use of a damper during sudden decelerations.
  • auxiliary venturi tube 2 makes it possible to increase the speed of passage of the air at the level of the nozzle and thus to improve the spraying.
  • the various types of sprinklers listed above have the same properties.
  • the reduced length of the fuel line between tank and nozzle significantly improves the dynamics of the assembly.
  • Adequate sizing of the venturi tube 1 making it possible to obtain a sonic regime at the neck well after the appearance of this phenomenon at the level of the neck 2 allows a "double compound body" effect.
  • the overflow tank 3 can be replaced by a constant level tank.
  • the venturi tube 1 can optionally conduct a fuel mixture.
  • a “double body with simultaneous opening” system is such that the fuel is supplied by a single auxiliary venturi. All the remarks concerning the basic system can be transposed there.

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)
EP89400548A 1988-03-01 1989-02-28 Vorrichtung zur Aufbereitung und zur Verteilung eines Brennstoff-Luft-Gemisches für eine Otto-Brennkraftmaschine Withdrawn EP0331574A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8802530A FR2628148B1 (fr) 1988-03-01 1988-03-01 Dispositif de preparation et de distribution d'un melange carbure pour un moteur a allumage commande
FR8802530 1988-03-01

Publications (1)

Publication Number Publication Date
EP0331574A1 true EP0331574A1 (de) 1989-09-06

Family

ID=9363767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400548A Withdrawn EP0331574A1 (de) 1988-03-01 1989-02-28 Vorrichtung zur Aufbereitung und zur Verteilung eines Brennstoff-Luft-Gemisches für eine Otto-Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP0331574A1 (de)
FR (1) FR2628148B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR25837E (fr) * 1921-12-20 1923-05-28 Carburateur
DE427192C (de) * 1923-10-21 1926-03-27 Pallas App Ges M B H Vergaser fuer Verbrennungskraftmaschinen
FR719046A (fr) * 1931-06-23 1932-02-01 Jean Schwarze Et H Mahe Ets Gicleur à débits variables automatiquement pour carburateur
FR2508106A1 (fr) * 1981-06-19 1982-12-24 Bosch Pierburg System Ohg Dispositif doseur de fluides liquides ou gazeux, notamment pour carburateurs et systemes d'injection
EP0218515A1 (de) * 1985-09-20 1987-04-15 Regie Nationale Des Usines Renault Vergaser für Brennkraftmaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58117341A (ja) * 1981-12-29 1983-07-12 Mikuni Kogyo Co Ltd 燃料先行電子制卸気化器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR25837E (fr) * 1921-12-20 1923-05-28 Carburateur
DE427192C (de) * 1923-10-21 1926-03-27 Pallas App Ges M B H Vergaser fuer Verbrennungskraftmaschinen
FR719046A (fr) * 1931-06-23 1932-02-01 Jean Schwarze Et H Mahe Ets Gicleur à débits variables automatiquement pour carburateur
FR2508106A1 (fr) * 1981-06-19 1982-12-24 Bosch Pierburg System Ohg Dispositif doseur de fluides liquides ou gazeux, notamment pour carburateurs et systemes d'injection
EP0218515A1 (de) * 1985-09-20 1987-04-15 Regie Nationale Des Usines Renault Vergaser für Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 223 (M-247)[1368], 4 octobre 1983, 61 M 247; & JP-A-58 117 341 (MIKUNI KOGYO K.K.) 12-07-1983 *

Also Published As

Publication number Publication date
FR2628148A1 (fr) 1989-09-08
FR2628148B1 (fr) 1990-07-06

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