EP0036346A1 - Regelvorrichtung für die Zusammensetzung eines in einem Vergaser hergestellten Gemisches - Google Patents

Regelvorrichtung für die Zusammensetzung eines in einem Vergaser hergestellten Gemisches Download PDF

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Publication number
EP0036346A1
EP0036346A1 EP81400275A EP81400275A EP0036346A1 EP 0036346 A1 EP0036346 A1 EP 0036346A1 EP 81400275 A EP81400275 A EP 81400275A EP 81400275 A EP81400275 A EP 81400275A EP 0036346 A1 EP0036346 A1 EP 0036346A1
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EP
European Patent Office
Prior art keywords
membrane
chamber
spring
well
bell
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Withdrawn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
EP81400275A
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English (en)
French (fr)
Inventor
Claude Sennely
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0036346A1 publication Critical patent/EP0036346A1/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Withdrawn legal-status Critical Current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
    • F02M3/00—Idling devices for carburettors
    • F02M3/08—Other details of idling devices
    • F02M3/09—Valves responsive to engine conditions, e.g. manifold vacuum

Definitions

  • the present invention relates to improvements made to fuel saving devices for carburetors and other similar devices producing fuel-oxidizer mixtures, in particular for internal combustion engines.
  • Energy-saving devices in general and fuel-saving devices in particular are tending to multiply, but their effectiveness has not always been demonstrated, at least on a large scale, over extended periods of use in a reproductive manner.
  • the device described in this patent application is constituted by a small regulating device connected on the one hand to the air filter, on the filtered air side, and on the other hand to the dsralenti well of the carburetor, between the idle jet and the outlet of this well in the intake manifold, by means of a special richness screw pierced which can be used in particular for this purpose.
  • This regulator aims to reduce excess consumption and the increase in pollution especially in transient regimes.
  • this device acts directly on the cause of these harmful effects, that is to say on the excessive values reached by the depression prevailing in the idle shaft, while the supply of the engine is provided, for a variable part according to the engine speed, by the mixture from the progressive openings generally provided at the base of the idle well and released by the rotation of the butterfly.
  • This regulating device comprises an enclosure divided into two chambers of variable volumes by a deformable membrane which, in the rest position, closes the communication between two pipes, namely a first pipe connected to a source of additional gas (for example filtered air) and a second pipe opening at the base of the idle well of the carburetor, downstream of the air calibrator and the idle jet but upstream of the progressive openings making the idle well communicate with the carburetor carburetor chamber.
  • the moving element constituted by the deformable membrane moves under the effect of the depression in the idle shaft from a predetermined threshold of depression, and this against a reminder device, to put in communication the idle well and the additional gas source.
  • the regulator which operates as an automatic valve, puts the idle well in communication with the atmosphere at appropriate times (through the air filter) or with a source of additional fluid (crankcase gas or recycled exhaust gas). other combustible gases or not).
  • the air calibrator is thus unsuccessful, the vacuum in the well downstream of the idle jet is lowered and the latter, which is then requested by a lower vacuum, sees its flow reduced, while the overall air flow n 'is not changed to a large extent so as not to affect the operation of the engine. This avoids the over-enrichment of the fuel / oxidizer mixture which usually occurs and eliminates the harmful effects on consumption and pollution.
  • Such a regulating device presents a frank opening and closing, the vacuum threshold controlling the opening being determined in a fixed manner for a given device.
  • the present invention therefore aims to mainly regulate the opening and closing threshold of the regulating device without affecting the fundamental characteristics described above.
  • the regulating device is characterized in that it comprises adjustment means which act jointly, additively or subtractively, with the mechanism for returning the moving element to adjust the opening and closure of the deformable membrane.
  • the regulating device according to the invention shown in FIG. 1 comprises a body 1 secured to a dome 2.
  • An insert 3, preferably made of steel, is pierced axially with a passage 4 opening into the two upper and lower ends of the insert 3. At its lower end, this insert 3 is connected, via a tube 5, either directly to the idle well 14 of a carburetor 15 or to an idle richness screw 6 which is dig.
  • the body 1 is also pierced with a conduit 7 in order to establish communication, via a tube 8, with the air filter not shown.
  • This lower chamber 13 communicates permanently with the duct 7 connected to the air filter.
  • the membrane 9 carries in its center a rivet 11 pierced axially from side to side and now on the upper face of the membrane 9 a magnetized washer 12.
  • This magnetized washer 12 is disposed above the insert 3 so as to maintain normally applied, by magnetic attraction, the central part of the membrane 9 to the upper end of the insert 3.
  • the upper chamber 10 is in communication, via the hollow rivet 11, of the passage 4 .from the tube 5, and the hollow idle screw 6 with the well, but there is no communication between the air filter and the well, the chamber 13 not being in communication with 4.
  • the regulating device is provided with means making it possible, as a function of the characteristics of the magnet 12 and of the air gap at rest, to adjust the opening and closing thresholds determined by the force of attraction of the magnet on the return piece constituted by the insert 3. This adjustment can be carried out either by applying an adjustable force more or less strengthening or weakening the fixed attraction force of the magnet on the return piece 3, either by direct adjustment of the attraction force by varying the air gap at rest between the magnet and the return piece .
  • the regulating device shown in FIG. 1 comprises adjustment means which act by application of an adjustable force more or less reinforcing the force of attraction.
  • adjustment means include a spring 20 which is housed in the upper chamber 10 between the magnet 12 and an adjustment screw 21 screwed into a vertical threaded hole provided in the upper part of the dome 2.
  • the adjustment screw 21, the spring 20 , the magnet 12 and the insert 3 are thus arranged coaxially one above the other.
  • the upper end of the screw 21, provided with a slot, is accessible from the outside to allow adjustment.
  • the initial compression of the spring 20 can be modified, the force of which applies downwards on the magnet 12, that is to say in the same direction as the force of attraction. magnetic.
  • the screw 21 may constitute a stop limiting the lifting of the magnet 12, the position of the stop formed by the screw 21 depending on the adjustment.
  • the action of the spring 20 significantly modifies the dynamic operating conditions. Indeed the opening speed of the membrane 9 is braked while on the contrary the closing speed is increased since in the latter case the spring 20 relaxes.
  • the mode of action of the regulator device according to the invention is apparent from the diagram in FIG. 2 which represents in its upper part, as a function of the depression ⁇ p in the well (measured in centimeters of water) the variations in the flow rates Qa of the air calibrator and Qe of the replay nozzle (measured in grams per unit of time) using two curves, respectively in strong and fine lines and whose data scales are in the ratio from 1 to 15.
  • the section lower is represented the variation of this depression A p according to the engine speed N (in revolutions per minute) according to the curve ⁇ pI in fine line in the absence of the regulator and according to the curve ⁇ pII in strong line with intervention of the regulator.
  • the Qa and Qe flow curves have pseudo parabolic gaits, the first starting from the origin, the second from a point slightly offset on the abscissa axis, e offset coming from the delay in starting the nozzle idle.
  • the Qe curve rises faster than the Qa curve and cuts it at a point where the fuel and air flow rates are in the ratio of 1 to 15 to constitute a mixture of unit richness.
  • the throttle valve is closed and the vacuum in the well ⁇ pr is low. During its opening it unmasks the orifices of progressiveness, hence the increase in the depression in the well as a result of a wider communication between this well and the intake manifold, where reigns, downstream of the butterfly, high depression.
  • the curve representing the variation of the depression ⁇ p in the well takes the shape ⁇ pII because as soon as the depression reaches the value ⁇ po (regulator opening threshold) the membrane 9 lifts and puts in communication with the atmosphere (or the gas source) with the idle well, which reduces the vacuum in this well with air injection, bypassing the air calibrator flow.
  • the regulator intervenes as long as the depression in the well remains greater than ⁇ po. Because of this action, the depression in question never exceeds a value ⁇ pM lying on a generally flattened maximum, adapted to the desired optimum richness.
  • the adjustment means which are incorporated in the regulating device make it possible to adjust at will the lower threshold corresponding to the opening of the membrane 9, that is to say the minimum depression ⁇ p 0 from which the additional air injection. (NB - on the diagram this injection was voluntarily accused to facilitate the examination).
  • a compression spring 30 is arranged below the membrane 9, in a central housing provided in the insert 3, this spring bearing on the one hand under the membrane 9 and on the other hand on a nut 31 pierced with a passage 31a and screwed into the insert 3.
  • This insert 3 is produced in tubular form and its lower end is closed by a plug 32 screwed into the insert 3 and which is drilled axially from the duct 4.
  • the adjustment of the device is carried out by screwing more or less, by means of an appropriate tool engaged through the conduit 4, the nut 31 in the insert 3.
  • the disadvantage of this arrangement is however that to effect the adjustment , which must be done while the engine is running at idle, it is necessary to have a special fitting and that the passage of the adjustment tool through the conduit 4 may reduce the section too much and thus disturb the transmission of the vacuum and the flow rate of the fluid injected at the opening.
  • the spring 30 acts so as to increase the opening speed and, on the contrary, to temper the closing speed.
  • the screw 21 which is screwed into the upper part of the dome 2, extends downwards by a cylindrical rod 40 on which are arranged a washer 41 bearing on the shoulder 42 of the screw thread, a compression spring 43 surrounding the rod 40, and at the lower end of this rod 40, a sliding weight 44 made of steel, held in the lower extreme position against a stop 46 provided at the lower end of the rod 40.
  • An internal recess 45 of the counterweight 44 allows the maximum desired lifting for the moving assembly magnet 12 - membrane 9 after the magnet 12 has come into contact with the counterweight 44 .
  • the counterweight 44 exerts on the magnet an upward attraction force which opposes the downward attraction force exerted by the insert 3 on the magnet 12.
  • the subtractive force exerted upwards is a function of the distance between this magnet 12 and the lower annular edge 47 of the cylindrical skirt of the counterweight 44. This subtractive force can therefore be adjusted by more or less screwing the screw 21, which has the effect of spreading or bring the flyweight 44 closer to the magnet 12.
  • the spring 48 is calibrated to push the counterweight against the stop 46 as soon as the depression becomes less than a fixed value and bring the magnet 12 near the insert at a distance such that the attraction of the latter prevails on that of the flyweight 44.
  • the magnet 12 is then returned to the insert 3 and takes off from the counterweight 44, which ensures the closure of the valve.
  • a special part 48 is placed above the latter, self-locking in the upper part of the cap 2, to ensure controllable inviolability of the device;
  • the magnet 12 is not directly in contact with the membrane 9 but it is spread apart upwards by a spacer 51.
  • a hollow rivet 52 of suitable length assembles the magnet 12 with the membrane 9, while allowing the vacuum prevailing in the idle well to be established in the upper chamber 10.
  • the return piece consists of a washer 57 which is arranged around the spacer 51 and which provides a free passage in the center for this spacer.
  • This washer 57 is fixed to the lower part of a bell 53 whose vertical position can be adjusted by a screw-nut assembly 55 provided on the bell 53 and on a coaxial cover 56 forming part of the dome 2.
  • a gasket sealing 59 is provided between the upper part of the bell 53 and the cover 56 which surrounds it.
  • the bell 53 is shown in its lowest position corresponding to a maximum air gap between the magnet 12 and the washer 57 acting as a return piece. Therefore, the attractive force exerted on the magnet 12 and therefore on the membrane 9 is minimal.
  • the bell 53 upward By moving the bell 53 upward, the air gap between the magnet 12 and the washer 57 is reduced and the pulling force downward increases up to a maximum value when the air gap becomes zero.
  • the vacuum in the upper chamber 10 is established by the play between magnet 12 and bell 53 and between washer 57 and spacer 51. If necessary channels can be provided in the skirt of the bell 53 to facilitate the establishment of the vacuum.
  • the bell is rotated by an appropriate tool which can engage in a housing 60 provided at the top of the bell.
  • the passage of the tool can be condemned by a plug 48 put in place after adjustment and the removal of which leaves a visible trace, thus making it possible to control intervention on the device.
  • a magnet which constitutes a spring of a particular type which, due to the law of variation of the force of attraction depending on the variation of the air gap, ensures rapid opening and closing, which is desirable in most cases to be treated.
  • optimization requires more gradual regulation and the magnet can then be replaced by a system of two springs allowing an adjustment respecting a determined lifting law of the magnet - membrane assembly.
  • Figure 6 illustrates a particular embodiment of such a device in which there are the main parts namely the dome 2, the bell 53 and the adjustment mode by screwing the bell 53 in the cover 56.
  • the magnet is replaced by two springs 61 and 62 each mounted with a determined prestress.
  • the spring 61 is supported under the upper flange of the bell 53 and it applies the membrane 9 to the seat of the device constituted by the insert 3.
  • the other spring 62 which is supported on a washer fixed to the lower part of the bell 53 on the contrary tends to lift the membrane.
  • This is therefore a conventional opposition assembly which can, by placing the bell in a suitable position. 53, produce a determined force to press the membrane 9 onto its seat.
  • the law of lifting of the membrane after opening depends on the characteristics of the two springs 61 and 62.
  • the connection between the bell 53 and the membrane 9 is provided by a spacer 63 which is fixed to the membrane 9 at its lower part and which has, at its upper end, a shoulder under which the spring 62 is supported, this spring 62 is thus finding compressed between this shoulder and the transverse washer provided at the lower part of the, bell 53.
  • the other spring 61 is engaged in an axial housing provided in the spacer 63 and it is supported in the bottom of this housing, so as to push the spacer 63 and therefore the membrane 9 down.
  • the bottom of the spacer 63 is pierced with a hole 64 through which the depression is transmitted.
  • a needle 65 which, during the movements of the membrane 9 - spacer 63 moving element, is more or less engaged in the inlet 67 of the channel making the device communicate with the idle well 14.
  • the shape of the needle 65 and that of the inlet 67 makes it possible to obtain a variable passage section, resulting in regulation of the flow rate of the fluid as a function of the Depression.
  • the operation of the apparatus of FIG. 6 is illustrated by the diagram in FIG. 7.
  • the springs 61 and 62 are compressed to initial arrow values Oa and Ob, the equilibrium point being P.
  • the spring 62 By acting on the bell 53 so as to bring it down, it is ie to compress the spring 61, the spring 62 is relaxed and the operating points come in P for the spring 61 and P 2 for the spring 62.
  • the force of application of the membrane 9 on its seat is then shown by P 1 P 2 which controls the opening threshold. If the vacuum exceeding this threshold increases so as to move the spacer by 00, the spring 61 will undergo additional compression and, on the contrary, the spring 62 will undergo a corresponding extension.
  • the force counterbalancing the action of the vacuum on the spacer is then represented by P ' 1 P' 2 . There is therefore an increase in this force as a function of the characteristics of the springs.
  • the threshold is therefore adjustable and the lifting of the membrane 9 - spacer 63 assembly can be controlled as a function of the characteristics of the opposing springs 61 and 62.
  • the adjustment system acts jointly, additively or subtractively, with at least one system for recalling the crew to the rest or opening position.
  • the adjustment system can also serve as a stop for the moving element. It is also possible by means of a suitable piece 65, fixed to the movable assembly integral with the membrane, to vary the useful passage section 67 between the chamber 13 and the pipe 4 connecting the apparatus to the idle well in function lifting of the moving part. Holes such as 66 allow the vacuum to be established in the chamber 13, their cross-section notably conditioning the response time of the device on opening.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Prostheses (AREA)
EP81400275A 1980-02-21 1981-02-20 Regelvorrichtung für die Zusammensetzung eines in einem Vergaser hergestellten Gemisches Withdrawn EP0036346A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8003811A FR2476749A1 (fr) 1980-02-21 1980-02-21 Perfectionnements aux dispositifs economiseurs de carburant et reducteurs de pollution
FR8003811 1980-02-21

Publications (1)

Publication Number Publication Date
EP0036346A1 true EP0036346A1 (de) 1981-09-23

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EP81400275A Withdrawn EP0036346A1 (de) 1980-02-21 1981-02-20 Regelvorrichtung für die Zusammensetzung eines in einem Vergaser hergestellten Gemisches

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EP (1) EP0036346A1 (de)
FR (1) FR2476749A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2076606A5 (de) * 1970-01-21 1971-10-15 Hebert Eugene

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2076606A5 (de) * 1970-01-21 1971-10-15 Hebert Eugene

Also Published As

Publication number Publication date
FR2476749A1 (fr) 1981-08-28

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