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EP0262027B1 - Vergaser mit Startautomatik - Google Patents

Vergaser mit Startautomatik Download PDF

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Publication number
EP0262027B1
EP0262027B1 EP87402043A EP87402043A EP0262027B1 EP 0262027 B1 EP0262027 B1 EP 0262027B1 EP 87402043 A EP87402043 A EP 87402043A EP 87402043 A EP87402043 A EP 87402043A EP 0262027 B1 EP0262027 B1 EP 0262027B1
Authority
EP
European Patent Office
Prior art keywords
engine
valve
temperature
responsive
duration
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
EP87402043A
Other languages
English (en)
French (fr)
Other versions
EP0262027A1 (de
Inventor
Bernard Martel
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.)
Solex SA
Original Assignee
Solex SA
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 Solex SA filed Critical Solex SA
Publication of EP0262027A1 publication Critical patent/EP0262027A1/de
Application granted granted Critical
Publication of EP0262027B1 publication Critical patent/EP0262027B1/de
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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat

Definitions

  • the invention relates to carburetors for internal combustion engines, provided with an automatic starting device comprising a starting flap whose progressive opening, during the warming of the engine, is controlled by an element whose temperature increases as and as the engine warms up, such as for example a bimetallic spiral subjected to the temperature of the engine cooling water or a capsule containing a thermodilatable material.
  • the invention relates more particularly to carburetors which successively comprise, in an intake duct, from downstream to upstream, a throttling member operable by the user, the outlet of a main fuel spouting system and a flap starting load in the direction of closing by the temperature-sensitive element when this temperature is below a limit value and in the direction of opening by the air current which bypasses it.
  • Known carburetors of this kind generally also have a pneumatic element subjected to the vacuum which prevails in the intake duct downstream of the main throttling member and designed to give to the starting flap, as soon as the engine is running. itself, a minimum opening.
  • the high vacuum which prevails in the intake duct at the outlet of the main spouting system when the shutter is closed makes it possible to obtain a rich air / fuel mixture while the engine is driven by the starter; the shutter opens partially as soon as the engine turns by itself, which avoids the blockage and the stalling of the engine by excess of wealth.
  • the present invention aims to provide a carburetor with a starting device that better meets those previously known than the requirements of practice, in particular in that it allows a restart of the cold engine very shortly after stopping, that is to say to solve a problem different from the previous one.
  • the invention provides a carburetor according to claim 1 or claim 4.
  • the main throttling member 2 is associated with means not shown, which may be conventional, which regulate its minimum opening as a function of the temperature of the engine cooling water.
  • the main fuel spouting system 5 comprises a well 11 supplied with fuel from the tank 6, and a nozzle 12.
  • the fuel taken from the well 11 by a tube 13 mixes with emulsion air from the air inlet 8 of the intake duct 1 through a calibrated orifice 14.
  • a channel 15 receives the air-fuel mixture formed in the tube 13 and leads it to the spray orifice 15a located inside of a secondary venturi 16, placed at the neck of the venturi 4.
  • the starting flap 9 is mounted eccentrically on an axis 23 integral with a lever 10 terminated by a curved finger 10a.
  • a finger 10a On this finger 10a is hung the end mobile 20a of a thermostatic member 20, such as a bimetallic spiral.
  • the spiral 20 is contained in a housing (not shown) fixed on the body of the carburetor and its internal end is fixed on a boss of the housing; the spiral 20 can be brought to a temperature representative of that of the engine by conventional heating means, for example by circulating water for cooling the engine. It is designed to let the shutter close when it is cold and to drive the shutter gradually in the direction of opening when its temperature increases.
  • the lever 10 has a unidirectional abutment connection with a rod 21.
  • the lever 10 has a support plate 10b of the end 22, bent at right angles to the rod 21.
  • the end 22 is kept at a constant distance from the axis 23 of the starting flap 9 by a lever 24 mounted idly on this axis 23.
  • the other end of the rod 21 is coupled to the membrane 25 of a pneumatic capsule 26.
  • This membrane 25 is sandwiched between two cups 27 and 28 and divides the housing of the capsule 26 into two compartments 29 and 30.
  • the compartment 29 is connected to the air inlet 8 of the intake duct and the compartment 30 is connected to the part of the intake duct 1 located downstream of the butterfly 2 by a pipe 31.
  • a spring 32 placed in the housing of the capsule pushes the rod in the closing direction of the flap 9 and opposes the force created by the pressure difference acting on the membrane 25.
  • a screw 33 for abutment of the rod 21 makes it possible to adjust the degree of opening partial of the starting flap 9 by the displacement of the membrane due to the vacuum prevailing in the duct 1 downstream of the butterfly 2.
  • the carburetor further comprises a movable stop 40 for partial forced opening of the flap 9.
  • the stop 40 shown is constituted by the plunger of an electromagnet 41.
  • This electromagnet 41 comprises a coil 42 and a fixed central core 43.
  • a spring 44 brings the stop in a rest position where a collar of the plunger 40 rests against a seat 45 on the frame of the electromagnet 41.
  • the stop then prevents the flap 9 from closing beyond a predetermined position.
  • the stop has been shown on the closing path of the butterfly, for greater clarity. In reality, the stop is placed on the path of a lever integral with the flap 9 and its axis 23.
  • the plunger 40 When an electric current flows in the winding 42, the plunger 40 is drawn into an active position against the core 43, and releases the flap 9 which can take a fully closed position.
  • the calculation unit includes a clock. It will often be incorporated into a computer managing the engine's supply of air / fuel mixture at all speeds.
  • the calculation unit contains a counter accumulating the pulses supplied by the clock from the moment when the sensor 52 indicates that the engine is running at a speed higher than that at which the starter drives it until the engine stops, which can be detected either by returning to speed 0, or by switching off the ignition detected using of sensor 54.
  • the counter has a determined capacity and emits an overflow signal / t0 if t0 is exceeded.
  • the second condition can be detected by providing in the calculation unit 50 a counter which increments at the rate of the clock after the engine has stopped and whose capacity corresponds to the duration t1, so that the overflow / t1 of the counter indicates that the duration t1 has been exceeded.
  • An additional condition to be fulfilled for the supply is advantageously the closing of the ignition contact, indicated by the sensor 54, so as not to unnecessarily consume current when the engine is at rest.
  • the temperature sensor is not essential; when the engine is hot, the movable stop 40 at rest does in fact duplicate the bimetallic spiral 20 and the fact that it is erased by coming into the active position is without disadvantage for operation. However, it is advantageous to use this movable stop only when necessary, that is to say when the temperature of the motor is less than a determined value and therefore cut the power supply to the electromagnet as soon as the motor warms up.
  • t1 can be constant, for example one hour. If these two conditions are not met, the mobile stop 40 is retracted and authorizes the complete closing of the starting flap 9.
  • the calculating member 50 can be provided so as to no longer supply the electromagnet 41 as soon as the cooling temperature ⁇ has reached a set value for which the bimetallic spiral has already half-opened the shutter, or as soon as the engine is running. itself at a speed at least equal to the idle speed.
  • the movable stop then returns to its rest position shown in FIG. 1.
  • the cold engine has been stopped after short-term operation, for example one to three minutes, the temperature ⁇ has not increased significantly and the bimetallic spiral does not exert a force capable of partially opening the shutter.
  • the calculation member 50 does not supply the electromagnet 41.
  • the movable stop 40 remains in the position shown in FIG. 1, prevents the shutter 9 from being completely closed and prevents stalling. of the engine by excess wealth.
  • the circuit 50 will then include a time delay equal to the second threshold value mentioned above.
  • the circuit can obviously be completed by means which inhibit the supply of the solenoid valve 60 as soon as the temperature of the engine has exceeded a determined value so as not to unnecessarily excite the solenoid valve after a new restart of the engine.
  • the circuit 50 supplies the solenoid valve 60 so as to maintain the vacuum existing in the chamber 30 of the capsule 26 and to prevent the shutter 9 from closing completely.
  • the carburetor does not include a pneumatic assistance capsule partially opening the starting flap 9.
  • the calculating member 50 is programmed or wired so as to cause the coming of the movable stop 40 in its rest position as soon as the speed of the motor, supplied by the sensor 52, indicates that the motor is running by itself.
  • the speed reaches, on a passenger vehicle engine, a speed of 600 revolutions / minute, it can be considered that the engine is autonomous. This solution has the advantage of a significant simplification.
  • the invention applies particularly well to the case of so-called "electronic" carburetors comprising a computer which can easily fulfill the function or the functions required by adding a few instructions or some electronic components, as well as the movable stop for example to a carburetor of the kind described in patent application FR 2 568 631.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Claims (4)

  1. Vergaser für eine Brennkrsftmaschine umfassend:
    eine Starterklappe (9), die durch ein Element (20), das auf die Motortemperatur anspricht, in Schließrichtung beaufschlagt ist, wenn diese Temperatur unter einem Grenzwert liegt, und in Öffnungsrichtung durch den Luftstrom, der es umströmt, beaufschlagt ist;
    erste Einrichtungen, die mindestens eine erste Stellung, in welcher sie das vollständige Schließen der Klappe zulassen, und eine zweite Stellung, in welcher sie das schließen der Klappe bis zu einer bestimmten Stellung verhindern;
    und
    zweite Einrichtungen (50 oder 60), die mindestens auf die Motortemperatur ansprechen und bestimmt sind, nach den Betriebszuständen des Motors die ersten Einrichtungen entweder in ihre erste oder in ihre zweite Stellung einzustellen,
    dadurch gekennzeichnet,
    daß die ersten Einrichtungen einen beweglichen Anschlag (40) für die Startklappe (9), der elektrisch gesteuert ist, umfassen, wobei die erste Stellung erhalten wird, wenn die elektrische Steuerung aktiviert wird, und die zweite Ruhestellung, wenn die elektrische Steuerung desaktiviert wird, und dadurch, dar die zweiten Einrichtungen eine Recheneinrichtung (50) umfassen mit mindestens einem Sensor für die Geschwindigkeit und für das Schließen des Zündkontaktes, der ein elektrisches Signal liefert, das den Anschlag beim Schließen des Zündkontaktes in seine erste Stellung bringt und die elektrische Steuerung hemmt, um die ersten Einrichtungen in der Ruhestellung zu halten, im Falle das Startens des kalten Motors nach einer Betriebssequenz des kalten Motors für eine Dauer länger als ein erster Schwellwert, gefolgt von einem Halt des Motors für eine Dauer geringer als ein zweiter Schwellwert, wobei die Schwellwerte durch die Recheneinrichtung festgesetzt werden.
  2. Vergaser nach Anspruch 1,
    dadurch gekennzeichnet,
    dar die Recheneinrichtung (50) eine Uhr und Zähleinrichtungen umfaßt, um die Betriebszsit des Motors oder die Anzahl der Umdrehungen des Motors und die seit dem Halt des Motors vergangene Zeit zu messen.
  3. Vergaser nach einem der Ansprüche 1 oder 2,
    dadurch gekennzeichnet,
    daß die zweiten Einrichtungen vorgesehen sind, um den Anschlag (40) in seine Ruhestellung zurückzubringen, sobald die Motorengeschwindigkeit einen bestimmten Wert überschreitet, wobei der Vergaser frei ist von einem pneumatischen Element zum Öffnen der Starterklappe in Abhängigkeit vom Auftreten eines Unterdruckes stromabwärts von der Drosseleinrichtung (2), die vom Fahrer gesteuert wird.
  4. Vergaser für eine Brennkraftmaschine umfassend:
    eine Starterklappe (9), die durch ein Element (20), das auf die Temperatur des Motors anspricht, in Schließrichtung beaufschlagt ist, wenn diese Temperatur geringer ist als ein Grenzwert, und in Öffnungsrichtung durch den Luftstrom, der sie umströmt, beaufschlagt ist,
    erste Einrichtungen, die mindestens eine erste Stellung, in welcher sie das vollständige Schließen der Klappe erlauben, und eine zweite Stellung vorsehen, in welcher sie das Schließen der Klappe bis zu einer bestimmten Stellung verhindern; und zweite Einrichtungen (50 oder 60), bestimmt zum Einstellen der ersten Einrichtungen gemäß dem Betriebszustand des Motors entweder in ihre erste Stellung oder in ihre zweite Stellung, wobei die ersten Einrichtungen aus einem pneumatischen Gehäuse (26) bestehen, um die Starterklappe teilweise zu öffnen, und die zweiten Einrichtungen ein Elektroventil (60) umfassen, das in einer Leitung angeordnet ist, die das pneumatische Element mit dem Teil der Einlaßleitung (1) verbindet, der stromabwärts von der Drosseleinrichtung (2) liegt, die gesteuert wird vom Fahrer, wobei sie mindestens auf die Motortemperatur ansprechen dadurch gekennzeichnet, daß das Elektroventil schließt, wenn es angeschlossen wird, und im Ruhezustand öffnet, und daß die zweiten Einrichtungen (50, 60) eine Recheneinrichtung (50) umfassen, die mindestens mit einem Geschwindigkeitssensor und einem Sensor für das Schließen des Zündkontaktes versehen ist, und das Elektroventil schließt, um die ersten Einrichtungen in ihrer zweiten Stellung zu halten im Falle einer Betriebssequenz des kalten Motors für eine Dauer, die länger als ein erster Schwellwert ist, gefolgt vom Wiederstarten des kalten Motors nach einem Halt des Motors, für eine Dauer geringer als ein zweiter Schwellwert, wobei die Recheneinheit (50) die Schwellwerte festlegt.
EP87402043A 1986-09-17 1987-09-14 Vergaser mit Startautomatik Expired - Lifetime EP0262027B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8613002A FR2603948B1 (fr) 1986-09-17 1986-09-17 Assistance electrique sur volet
FR8613002 1986-09-17

Publications (2)

Publication Number Publication Date
EP0262027A1 EP0262027A1 (de) 1988-03-30
EP0262027B1 true EP0262027B1 (de) 1991-04-17

Family

ID=9339037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402043A Expired - Lifetime EP0262027B1 (de) 1986-09-17 1987-09-14 Vergaser mit Startautomatik

Country Status (6)

Country Link
US (1) US4768478A (de)
EP (1) EP0262027B1 (de)
BR (1) BR8705178A (de)
DE (1) DE3769419D1 (de)
FR (1) FR2603948B1 (de)
MX (1) MX160167A (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH057481Y2 (de) * 1987-12-15 1993-02-25
DE3924353A1 (de) * 1989-07-22 1991-02-14 Prufrex Elektro App Steuerungssystem fuer den vergaser einer brennkraftmaschine
US5660765A (en) * 1996-06-26 1997-08-26 Kohler Co. Thermostatic element for controlling a solenoid operated carburetor choke
US6668530B2 (en) 2002-03-13 2003-12-30 Generac Power Systems, Inc. Grass-cutting tractor with improved operating features
US6752110B2 (en) * 2002-09-20 2004-06-22 Briggs & Stratton Corporation Electromechanical choke system for an internal combustion engine
US6830023B2 (en) * 2002-11-07 2004-12-14 Briggs & Stratton Corporation Electromagnetic choke system for an internal combustion engine
JP2010501287A (ja) * 2006-08-25 2010-01-21 ババエヴ，エイラズ 創傷治療用の可搬形の超音波器具
EP2025909A3 (de) * 2007-08-13 2010-03-10 Briggs and Stratton Corporation Automatischer Choke für einen Motor
US8219305B2 (en) * 2008-05-27 2012-07-10 Briggs & Stratton Corporation Engine with an automatic choke and method of operating an automatic choke for an engine
US7628387B1 (en) 2008-07-03 2009-12-08 Briggs And Stratton Corporation Engine air/fuel mixing apparatus
WO2015023885A2 (en) 2013-08-15 2015-02-19 Kohler Co. Systems and methods for electronically controlling fuel-to-air ratio for an internal combustion engine
US10054081B2 (en) 2014-10-17 2018-08-21 Kohler Co. Automatic starting system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1319388A (en) * 1919-10-21 Stobage-case fob pneumatic tikes
US2600368A (en) * 1945-06-02 1952-06-10 Bendix Aviat Corp Charge forming device
FR1319388A (fr) * 1962-01-17 1963-03-01 Sibe Perfectionnements apportés aux carburateurs, pour moteurs à combustion interne, comportant un dispositif auxiliaire pour la mise en marche et la marche à froid
US3248675A (en) * 1964-07-28 1966-04-26 Ford Motor Co Cold weather enrichment device for an internal combustion engine
JPS517338A (en) * 1974-07-05 1976-01-21 Honda Motor Co Ltd Kikakino chookubenseigyosochi
DE3028629C2 (de) * 1980-07-29 1983-11-24 Audi Nsu Auto Union Ag, 7107 Neckarsulm Vergaser für Brennkraftmaschinen, insbesondere in Kraftfahrzeugen
US4463723A (en) * 1982-04-01 1984-08-07 Acf Industries, Incorporated Apparatus for controllably opening a carburetor choke valve
JPS59128958A (ja) * 1983-01-12 1984-07-25 Hitachi Ltd チヨ−ク機構付気化器

Also Published As

Publication number Publication date
MX160167A (es) 1989-12-18
EP0262027A1 (de) 1988-03-30
BR8705178A (pt) 1988-05-24
US4768478A (en) 1988-09-06
FR2603948A1 (fr) 1988-03-18
FR2603948B1 (fr) 1991-01-11
DE3769419D1 (de) 1991-05-23

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