EP0088678A1 - Pneumatische Steuervorrichtung für die Vergaserluftklappe einer Brennkraftmaschine - Google Patents
Pneumatische Steuervorrichtung für die Vergaserluftklappe einer Brennkraftmaschine Download PDFInfo
- Publication number
- EP0088678A1 EP0088678A1 EP83400411A EP83400411A EP0088678A1 EP 0088678 A1 EP0088678 A1 EP 0088678A1 EP 83400411 A EP83400411 A EP 83400411A EP 83400411 A EP83400411 A EP 83400411A EP 0088678 A1 EP0088678 A1 EP 0088678A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capsule
- chamber
- intake manifold
- subjected
- engine
- 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.)
- Granted
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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
- F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
-
- 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
- F02M1/14—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 pressure in combustion-air- or fuel-air-mixture intake
Definitions
- the present invention relates to carburetors for internal combustion engines, of the type in which, during the cold operation of the engine, the tilting of an air flap is controlled as a function of the engine load between a minimum open position corresponding to the full load engine speed and a maximum opening position corresponding to a low load engine speed, and it relates more particularly to a pneumatic device for controlling such an air flap.
- the French patent application 81/04 185 describes a carburetor of this type in which the control of the air flap is ensured by a vacuum capsule comprising a membrane connected to the air flap by a linkage and subjected on one side at atmospheric pressure and on the other hand at the vacuum prevailing at the intake manifold as well as at the thrust of a spring urging the membrane in the direction which tends to close the air shutter.
- a cam controlled manually by the "choke” puller includes a movable stop between an active position where, in a first position of the cam corresponding to cold start, it cooperates with the linkage to limit the opening stroke of the air shutter and defines a half-open position of the latter, and a retracted position where, in a second position of the cam corresponding to cold operation, it allows the shutter to switch between its minimum open positions and d maximum opening.
- the capsule In the second position of the cam and when the engine is running at idle, vehicle stopped, the capsule, under the influence of vacuum (approximately 600 g / cm 2 ) then prevailing at the intake manifold, pulls the linkage and opens the air shutter.
- vacuum approximately 600 g / cm 2
- the depression in the intake manifold decreases and, depending on the degree of acceleration, it can reach values between 600 and 0 g / cm 2 .
- the capsule spring pushes the membrane and the air shutter return spring ensures the closing of the latter.
- the fuel mixture is then enriched, which makes it possible to obtain the desired acceleration of the vehicle.
- the flap To obtain good light acceleration of the vehicle, that is to say with a very low drop in depression, the flap must begin to close as soon as the reduction in depression is equal to 100 g / cm relative to the prevailing depression in the intake reader when the engine is idling, vehicle stopped.
- the reduction in vacuum in the intake manifold is greater than 100 gjcm 2 and, consequently, the flap is not completely open.
- the fuel mixture introduced into the engine is then richer, and the consumption higher.
- the present invention aims to eliminate this drawback, which can also be encountered in other carburetors of the aforementioned type and, for this purpose, it relates to a pneumatic control device of the air flap of a carburetor for internal combustion engine, carburetor in which, during the cold operation of the engine, the tilting of the air flap is controlled as a function of the engine load between a minimum open position corresponding to the engine's full load speed and a maximum opening position corresponding to a low engine load speed, said control device comprising a capsule having two chambers separated by a motor element connected by a linkage to the air flap and subjected to the action of a return spring urging the motor element in the direction which tends to close the air shutter, one of the chambers being subjected to atmospheric pressure and the other to the vacuum of the intake manifold, characteristic ized in that said other chamber has a controlled venting orifice and in that the control device comprises a second capsule with differential operation which opens the orifice in response to slight variations in the vacuum in the intake man
- Figure 1 schematically illustrates the starting flap mechanism of a carburetor which has been shown in fine lines the outline of the body 1, assumed transparent for clarity of the drawing.
- the body 1 comprises a venturi 2 in which is mounted a fuel spray device 3. Downstream of the venturi 2, a throttle valve 4 is rotatably mounted around an eccentric axis 5 between a completely closed position delimited by a stop 6 and a fully open position. The rotation of the butterfly 4 is controlled by a lever 7 to which is attached a spring 8 urging the butterfly 4 to its closed position.
- An air flap 9 for the cold start is also rotatably mounted around an eccentric axis 10 in the body 1, upstream of the venturi 2. This flap can switch between a completely closed position delimited by a stop 11 and a fully open position.
- the axis 10 is integral with one end of a lever 12 which controls the movements of the air flap 9 between its open and closed positions.
- a spring 13 hooked to the lever 12 biases the flap 9 towards its closed position.
- a cam 25 is articulated around an axis 26 parallel to the axes 5 and 100
- the rotational movements of the cam 25 around its axis 26 are controlled by a lever 27 integral with the axis 26 and a rod 28 with manual actuation.
- a part of the outer contour of the cam 25 constitutes a first cam surface D with which the free end of the lever 7 cooperates to half-open the throttle valve 4 when the choke is fully pulled out.
- the cam 25 comprises an appendage 30 in the form of a hook, the internal contour constitutes a cam surface F extending another cam surface E.
- This surface E is defined by a second part of the external contour of the cam 25 and cooperates with the articulation 23 of the lever 12 with the rod 14 to define the minimum opening position of the air shutter when the choke is partially pushed back, and keep this shutter fully open when the choke is fully pushed back.
- the vacuum in the intake manifold is applied to the control device 16 and the articulation 23 is applied against the cam surface F.
- the flap 9 then takes a half-open position as shown in FIG. 1.
- the appendix 30, which acts as a stop, is retracted by the rotation of the cam 25, as shown in FIG. 2: in fact, in this position of the cam 25, the lever 12 is free to switch between the fully open position of the shutter of FIG. 2 and a minimum open position delimited by the abutment of the joint 23 against the cam surface E.
- the position of the starting flap 9, and therefore the enrichment of the mixture then depend on the operating conditions of the engine.
- the vacuum in the intake manifold is high because the opening of the throttle valve is small, and the air flap 9 is fully open.
- the engine although cold, operates with an unenriched mixture identical to that supplied to it hot.
- the throttle valve is wide open, the vacuum at the intake manifold decreases quickly and the outlet 13, suitably sized, immediately returns the flap 9 to its position d opening imposed by ramp E.
- FIG. 3 shows the pneumatic control device 16 making it possible to ensure full opening of the air flap 9, even when the vacuum in the intake manifold is low, while ensuring the closing of this flap 9 for a very small variation of this depression at the start of acceleration.
- This device comprises two pneumatic capsules 101 and 102 rigidly connected to each other by parts 103 and 104.
- the rod 14 is integral with a membrane 106 of the first capsule 101, of which the left chamber 101 A, relative to the membrane 106, is subjected to atmospheric pressure.
- the straight chamber 101 B of the capsule 101 comprises a spring 107, having a calibration allowing the displacement of the membrane 106 under a very low vacuum in the intake manifold (not shown). This movement ensures the complete opening of the flap 9, via the rod 14.
- the chamber 101 B of the capsule 101 where the spring 107 is located is subjected to the vacuum prevailing in the intake manifold by a conduit 108 in which there is a calibration 109 and it includes an orifice 101 C for setting the controlled atmosphere.
- the sealing of the chamber 101 B with respect to the atmosphere is carried out using a plug 110 closing the orifice 101 C and integral with a rod 111 of the capsule 102.
- This rod is attached to the membrane 112 of the capsule 102.
- the capsule 102 comprises two chambers 102 A and 102 B which are separated by the membrane 112.
- the chamber 102 A is subjected to the vacuum prevailing in the intake manifold via a conduit 113
- the seal with respect to the atmosphere of the chamber 102 A of the capsule 102 is ensured by a bellows 117 which is tightened on one side on the rod 111, and on the other, on the left shell 105 of the capsule 102.
- the straight chamber 102 B of the capsule 102 comprises a spring 114, which has a very low calibration so that a low depression of approximately 50 g / cm 2 can move the membrane 112, and consequently the plug 110, to put the right chamber 101 A of the capsule 101 at atmospheric pressure.
- the right chamber 102 B of the capsule 102 is subjected to the vacuum prevailing at the intake manifold via a conduit 115, in which a calibration 116 is placed.
- the vacuum in the intake manifold is high.
- This vacuum applied via the conduit 108 and the calibration 109 in the right chamber 101 B of the capsule 101 acts on the membrane 106, which compresses the spring 107.
- the membrane 106 moves the rod 14 and the starting flap 9 is open.
- the two chambers of the capsule 102 are subjected to the vacuum in the intake manifold, but the establishment of this vacuum in the right-hand part takes place with a delay because of the calibration 116.
- the depression balance in the two chambers of the capsule 102 is broken: the depression immediately decreases in the left chamber 102 A of the capsule 102, but on the other hand, this reduction in depression in the straight chamber 102 B of the capsule 102 is delayed by the calibration 116.
- the spring 114 repels the membrane 112 which moves the rod 111 with its plug 110, which closes the orifice of the venting the right chamber 101 B of the capsule 101.
- a depression is restored in the right chamber 101 B of the capsule 101.
- This depression attracts the membrane 106 which compresses the spring 107, and the rod 14 opens the shutter 9 in a position which depends on the balance established between this depression., itself a function of the position of the throttle valve 4, and of the opposing force of the springs 13 and 107.
Landscapes
- 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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8203574 | 1982-03-04 | ||
FR8203574A FR2522729A1 (fr) | 1982-03-04 | 1982-03-04 | Dispositif de commande pneumatique du volet d'air d'un carburateur pour moteur a combustion interne |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0088678A1 true EP0088678A1 (de) | 1983-09-14 |
EP0088678B1 EP0088678B1 (de) | 1985-11-21 |
Family
ID=9271572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19830400411 Expired EP0088678B1 (de) | 1982-03-04 | 1983-03-01 | Pneumatische Steuervorrichtung für die Vergaserluftklappe einer Brennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0088678B1 (de) |
DE (1) | DE3361260D1 (de) |
ES (1) | ES520266A0 (de) |
FR (1) | FR2522729A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0295398A2 (de) * | 1987-06-15 | 1988-12-21 | Firma Andreas Stihl | Startautomatik für einen Verbrennungsmotor, insbesondere für den von Hand zu startenden Motor eines Arbeitsgerätes |
FR2640692A1 (fr) * | 1988-12-21 | 1990-06-22 | Stihl Andreas | Carburateur a membrane comportant un papillon des gaz et un volet de depart couples de facon a etre interdependants dans leur position |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2434518A1 (de) * | 1973-08-24 | 1975-03-06 | Ford Werke Ag | Abgasrueckfuehrvorrichtung fuer verbrennungskraftmaschinen |
US4111172A (en) * | 1974-11-30 | 1978-09-05 | Nissan Motor Company, Limited | System to feed exhaust gas into the induction passage of an internal combustion engine |
FR2393161A1 (fr) * | 1977-06-02 | 1978-12-29 | Sibe | Perfectionnements aux carburateurs munis d'un volet de depart |
-
1982
- 1982-03-04 FR FR8203574A patent/FR2522729A1/fr active Granted
-
1983
- 1983-03-01 DE DE8383400411T patent/DE3361260D1/de not_active Expired
- 1983-03-01 EP EP19830400411 patent/EP0088678B1/de not_active Expired
- 1983-03-03 ES ES520266A patent/ES520266A0/es active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2434518A1 (de) * | 1973-08-24 | 1975-03-06 | Ford Werke Ag | Abgasrueckfuehrvorrichtung fuer verbrennungskraftmaschinen |
US4111172A (en) * | 1974-11-30 | 1978-09-05 | Nissan Motor Company, Limited | System to feed exhaust gas into the induction passage of an internal combustion engine |
FR2393161A1 (fr) * | 1977-06-02 | 1978-12-29 | Sibe | Perfectionnements aux carburateurs munis d'un volet de depart |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0295398A2 (de) * | 1987-06-15 | 1988-12-21 | Firma Andreas Stihl | Startautomatik für einen Verbrennungsmotor, insbesondere für den von Hand zu startenden Motor eines Arbeitsgerätes |
EP0295398A3 (en) * | 1987-06-15 | 1989-11-15 | Firma Andreas Stihl | Starting device for an internal combustion engine, especially for a hand-started motor of a tool |
FR2640692A1 (fr) * | 1988-12-21 | 1990-06-22 | Stihl Andreas | Carburateur a membrane comportant un papillon des gaz et un volet de depart couples de facon a etre interdependants dans leur position |
Also Published As
Publication number | Publication date |
---|---|
FR2522729A1 (fr) | 1983-09-09 |
FR2522729B1 (de) | 1984-05-04 |
EP0088678B1 (de) | 1985-11-21 |
ES8401572A1 (es) | 1983-12-01 |
DE3361260D1 (en) | 1986-01-02 |
ES520266A0 (es) | 1983-12-01 |
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