EP1172552A1 - Dispositif d'injection de carburant pour moteur à combustion interne - Google Patents
Dispositif d'injection de carburant pour moteur à combustion interne Download PDFInfo
- Publication number
- EP1172552A1 EP1172552A1 EP01401853A EP01401853A EP1172552A1 EP 1172552 A1 EP1172552 A1 EP 1172552A1 EP 01401853 A EP01401853 A EP 01401853A EP 01401853 A EP01401853 A EP 01401853A EP 1172552 A1 EP1172552 A1 EP 1172552A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rod
- transducer
- nozzle
- injection device
- fuel
- 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
Links
- 238000002347 injection Methods 0.000 title claims abstract description 49
- 239000007924 injection Substances 0.000 title claims abstract description 49
- 239000000446 fuel Substances 0.000 title claims abstract description 46
- 238000002485 combustion reaction Methods 0.000 title claims description 11
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 230000008602 contraction Effects 0.000 claims abstract description 6
- 230000035939 shock Effects 0.000 claims abstract description 5
- 230000010355 oscillation Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 17
- 238000013016 damping Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 230000005284 excitation Effects 0.000 claims description 8
- 230000036316 preload Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002663 nebulization Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 11
- 239000000919 ceramic Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 4
- 230000005489 elastic deformation Effects 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229940082150 encore Drugs 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005279 excitation period Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000009688 liquid atomisation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Images
Classifications
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- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
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- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
-
- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/04—Injectors peculiar thereto
- F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means
Definitions
- the present invention relates to a device for injecting fuel for internal combustion engine intended in particular to equip a motor vehicle.
- the invention relates more particularly to a fuel injection device for atomizing the injected fuel in the form of very fine droplets as required.
- Such injection systems include an electric pump fuel supply which feeds, through a ramp of distribution, all the injectors under a given pressure.
- electronically controlling the valve actuator of each injector we control the start and duration of opening and determine then a precise amount of fuel injected.
- Electromagnetically controlled needle type injectors have limits that limit engine performance. In particular the times taken to open or close the needles are still too high, about 1 to 2 ms, which prevents ideally phasing the injection on all engine ranges. In addition, the minimum opening time, which determines the minimum dose of fuel that can be injected, is still too important for certain engine operating points.
- Known needle injectors also have orifices injection of relatively large diameters to allow flow the required quantities of fuel for full load operations and high engine speeds. This arrangement generates fuel jets with large drops, which slows down the vaporization of the fuel (and therefore the preparation of the fuel mixture) and is able to promote the wetting phenomenon of the walls.
- the non-vaporized fuel tends to settle on the walls of the combustion chamber.
- Such a deposit causes dosage problems, particularly acute in transients due to lack of knowledge of the amount of fuel actually mixed with the air in the chamber combustion.
- This wetting phenomenon is one of the causes significant high pollutant emissions during cold starts motors.
- injection devices comprising a needle opening system by translation associated with a secondary spraying system of the jet in outlet of the ejection nose, in these devices the liquid layer flows in continuous throughout the opening time and is refragmented by vibrations generated in the vicinity of the ejection nose as soon as contact between the liquid and the tip of the nose operates.
- a first drawback of this type of solution lies in the low liquid atomization capacity when the ejected liquid layer is important, see an atomization capacity limited only to a short instant at the start of contact with the liquid layer as well as at the end of ejection. Between these two moments contact is made for too short a period of time so that the vibrations and displacements generated at the end of the ejection nose can: either be transmitted as a surface wave in the liquid which nebulizes it is to generate local impulses on the fluid sheet this which has the effect of fragmenting the fluid layer.
- a second drawback of this type of solution is a time of response too long due to the opening mode which requires translating all the mass of the needle.
- U.S 5025766 we know a device injection whose nose vibrates around a frequency of 35 kHz and comprising a ball of given mass held in abutment against the seat of the injection nose by a preload spring. At each oscillation one opening appears between the seat of the injection nose and the ball, allowing thus the ejection of a quantity of fluid for a very short period of time corresponding to the period of oscillation, which makes it possible to nebulize the liquid with a high rate.
- the object of the invention is to propose a new type of device fuel injection to resolve all of these problems, the device being able to deliver with great precision and a very short response time a cloud of fuel drops whose sizes are very close and small enough to ensure vaporization complete and homogeneous of the injected fuel.
- the invention achieves its object thanks to a device for injecting fuel for an internal combustion engine, of the type comprising Fuel-fed injection box ending in a nozzle cylindrical at the end of which is formed an injection orifice, a cyclic vibration transducer located inside the housing such as a transducer and controlled in duration and intensity by the electronic engine control system, and shutter means arranged at the end of the nozzle and returned by elastic means of return against it, characterized in that said elastic return means consist of a rod passing through the body of the device injection to an area where said rod is integral with the transducer and joining the shutter means to the transducer, and on the other hand damping means of the integral assembly formed by the transducer, the rod, and the shutter means, so that the shutter means are recalled against the end of the nozzle, the vibration of the transducer generating alternating deformation in contraction and expansion in the rod so that at each vibration cycle the expansion undergone by the rod is translated by an elongation of said rod generating a displacement of obturating means elastically integral with
- an injection device whose opening at the level of the ejection nose is solely a function of the expanded or compressed state of the needle forming the valve in contact with the level of the nose, the variation of state being generated by a source of excitation electrically controlled ultrasound.
- the mass-spring type oscillations are eliminated. AT each oscillation a given amount of elastic deformation energy is transmitted in the rod and is expended in expansion-compression with a loss due to internal relaxations of the material constituting the rod, the rest of the energy being absorbed by the attenuation due to the crushing of the fluid blade wedged between the ejection nose and the valve forming the end of the needle. Oscillations occur at a frequency close to 50 KHz which generates short opening times and so finely atomize the ejected liquid.
- the injection device according to the invention has one or more of the following characteristics.
- the shutter means are formed by a rod, one end of which flared valve-shaped, this rod being mounted axially movable inside of the transducer and being elastically secured with this same transducer, in an area at the top of the transducer produced in the form of a cylinder which is narrower than the rest of the transducer.
- the shutter means forming a valve are recalled so constant against the end of the nozzle serving as seat for the valve by a elastic return device which can be formed from a material damping, this elastic and damping device supporting the assembly composed by the three elements which are the transducer, the rod and the valve, these three elements being themselves elastically integral.
- the shutter means forming a valve are brought against the tip of the nozzle after each opening by the contraction of the rod which follows the expansion of the rod during each vibration cycle.
- the shutter means forming a valve remain pressed against the end of the nozzle outside the phases of deformation of the rod thanks to by means of elastic and damping return bringing the whole of the transducer, rod and shutter means against the end of the nozzle forming a seat for the valve.
- the elastic and damping return means used to apply the obturating means against the end of the nozzle and supporting the assembly of the transducer and the rod is made of a material allowing dampen the transmission of vibrations between the transducer and the body of the injection box.
- the elastic and damping return means used to apply the shutter means against the end of the nozzle makes it possible to catch up with the possible play due to thermal expansions between the transducer, the rod and the injection nozzle, without actually modifying the preload sealing.
- the injection box contains the transducer, the rod and the material damping.
- a flow limiter is placed inside the nozzle in the space annular between the rod and the internal cylindrical surface of the nozzle so that during the ejection of the fluid, the flow of liquid passing through the nozzle is precisely defined by the space between the rod and the debit.
- the means for cyclically vibrating the rod are formed by a transducer with a mechanical amplification system and connected elastically to the rod to transmit the amplified deformations to it.
- annular guide comprising channels for the passage of the liquid against which the rod comes to rest so that the shutter means can be moved coaxially with the end nozzle.
- Channels formed in the collar to let the liquid pass can be used as a flow limiter.
- the transducer has a stack of more than two active components.
- the active components of the transducer are formed from a material piezoelectric.
- the active components of the transducer are formed from a material magnetostrictive.
- the mass of the transducer associated with the damping part constitutes a dissipative system having a very long response time by with respect to the excitation times of the transducer, so that the deformation of the rod and shocks occurring at the seat do not induce movement of the transducer body; alone the end of the cylinder terminating the transducer at its upper part oscillates on either side of the initial equilibrium position, these oscillations being passed down the rod.
- the injector body essentially comprises three separate bodies cooperating with each other.
- the first member consists of the injection box 15, which has an internal cavity 10 intended to be filled with fuel under pressure via an axial hole 16 for supplying fuel coming to connect to a pressurized fluid supply circuit.
- the cavity 10 opens at the lower end 6 of the nozzle 3 through an orifice 5.
- the housing 15 has inside a stepped part 11 on which is arranged a support element 9 made of a material damping, which support element receives the rear part 18 of a transducer 1.
- the second organ is made up of means capable of generating vibrations in a longitudinal mode at ultrasonic frequencies such a transducer 1, which transducer has a stepped portion 12 serving as a mechanical amplifier and ends at the top by a cylindrical tube 2 in which the vibrations from the transducer 1, the end of the tube 2 has a elastic securing zone 8 with a rod 4 described below so that the longitudinal vibrations are transmitted in the rod 4 from its end located in zone 8.
- the third member is constituted by a rod 4 movable housed axially inside the nozzle 3 and the lower end of which forms frustoconical 7 extends outside of the nozzle 3.
- This end 7 forming valve is adapted to come into contact with the inner surface of the nozzle 3 delimiting the lower opening 5 of the nozzle 3, surface defining a seat for said valve, and thus for closing the injection orifice of the fuel.
- the other end of the rod 4 is connected elastically to the transducer 1 in zone 8 located at the end of the tube 2, the elastic connection being ensured in the mass of the material by a weld or a bond mechanical with a higher prestress than the stresses generated in this area during operation of the transducer.
- the transducer 1 is placed coaxially with the nozzle 3 by guides 25 in the cavity 10 of the injection box on the support piece 9 formed from a material which is both shock absorbing and elastic.
- the part 9 ends in the zone of contact with the stepped part 11 of the injection box 15 by a washer 14 having characteristics of very low friction so that the transducer 1 can be almost free to rotate relative to the injection nozzle 3.
- a preload of a fixed value is exerted between the transducer 1 and the injection box 15, which prestressing results in a contraction of the material 9 and a translation additional of the rod 4 relative to the transducer 1.
- the rod 4 is then mechanically held in this position and secured to the end of the tube 2 over a length corresponding to zone 8.
- the tube 2 then consists of a solid part made of the material of the rod 4 surrounded by the material of the emitting part 19 of the transducer, this part being preferably selected from the same material as the rod 4.
- the part 9 exerts an elastic restoring force tending to spread the transducer 1 of nozzle 3 which causes the application of the end 7 of the rod 4, integral with the transducer 1, against the seat 6.
- the mass of the transducer 1 associated with the damping part 9 constitute a dissipative system with a very long response time by compared to the excitation times of transducer 1, so that the deformation of the rod and shocks occurring at the seat 6 do not induce movement of the body of the transducer 1, only the end of cylinder 2 oscillates on either side of the equilibrium position initial, which oscillations are transmitted in the rod 4.
- the transducer 1 is dimensioned to transmit a maximum of stresses at the stepped junction 12 with the tube or cylinder 2, this maximum constraints corresponding to a minimum amplitude of vibration for the material.
- the transducer 1 has a zone 17 made up of components piezoelectric or magnetostrictive assets, which respectively under the application of an electric or magnetic field is deformed into thickness.
- This part 17 is sandwiched between two other elements 18 and 19 made of an elastic material.
- the connection between the elements 17, 18, and 19 is provided by prestressing means such as a threaded pin 20 or a screw.
- prestressing means such as a threaded pin 20 or a screw.
- the stacking of several active components 17 allows add the thickness deformations generated by each of the rings, the deformation resulting from the total displacement of the stack rings remaining below the elastic deformation limit of the prestressing means 20.
- Reducing the diameter of part 19 to the part 2 amplifies the longitudinal deformations generated in the part 19 as far as zone 8 where transmission takes place in rod 4.
- the engine control computer 33 sends two pulses corresponding to the start and end of the injection, during this time an ultrasonic frequency generator 32 sends a train wave (level 5V) at a given frequency at the input of an amplifier 34, which makes it possible to attack the piezoelectric ceramics 17 in tension alternative (of the order of + -60V) at the same ultrasonic frequency during the duration of injection.
- an ultrasonic frequency generator 32 sends a train wave (level 5V) at a given frequency at the input of an amplifier 34, which makes it possible to attack the piezoelectric ceramics 17 in tension alternative (of the order of + -60V) at the same ultrasonic frequency during the duration of injection.
- the assembly composed of the transducer 1 and the rod 4 is dimensioned to resonate at the excitation frequency of the components active 17 and to amplify the longitudinal displacements up to the level from the lower end of the rod 4.
- the rod 4 initially closing the opening 21 by its end 7 forming a valve, deforms under the impulse provided to it when the end of the tube 2 starts to oscillate. This deformation is distributed elastically over the entire length of the rod 4 and is reflected at the end of the rod 4 where the ejection takes place. The proper response of the rod 4 allows oscillate the end 7 and thus bring up the opening 21 of cyclically.
- FIG. 4 describes the variation in position of the end 7 of the rod 4 (points Ai) relative to the end 6 of the nozzle 3 (points Bi) for a cycle of oscillation of the resonator assembly.
- the opening of the annular slot 21 is therefore oscillating and equal to the amplitude of vibration of the valve 7 relative to the end 6 as indicated in figure 4.
- the opening frequency of the slot then depends on the excitation frequency chosen for the transducer 1.
- the minimum opening time of the injection device is same order as the excitation period applied to the transducer 1, which excitation can be done a few tens of kilohertz, typically 50 kHz, which allows minimum opening times of around 20 ⁇ s. This makes it possible to deliver micro-quantities of liquid for a shorter period of time compared to more injection devices where the minimum time to operate the opening and closing of the injection nose is rather 300 ⁇ s.
- FIG. 5 there is shown a layout mode of an injector according to the invention in an internal combustion engine of motor vehicle.
- the fuel supply to the engine is of the multipoint type electronic control by which each combustion chamber 35 is supplied directly with fuel by at least one fuel injector opening into the bedroom.
- the injector body is fixed to the cylinder head 24 of the engine at its upper end by means not shown, this upper end being also connected to a fuel supply line 16 also not shown.
- the seal to the right of the injector well 31 is ensured by a O-ring 29 maintained in application between junction 11 and the edge 30 from the injection well 31.
- the transducer 1 comprises a cylinder 18 of steel of diameter 20 mm and height 25 mm including in its upper part a threaded pin 20.
- the threaded axis 20 of the cylinder 18 makes it possible to prestress the rings of piezoelectric ceramics 17 (external diameter 20 mm, diameter internal 6 mm, thickness 2 mm) between the cylinders 18 and the emitting part 19.
- the ceramics are arranged with anti parallel polarizations, electrodes 13 being interposed between each pair of ceramics.
- a titanium rod 4 with a diameter of 2 mm and comprising one end conical 7 with external diameter 5 mm is inserted in the axis of the transducer 1.
- An elastic and damping washer 9 has an orifice leaving pass the rod 4 and rests on the lower surface 11 of the cavity 10.
- the rod 4 is made integral with the transducer 1 in the zone 8 after having constrained the washer 9 to a certain prestressing value, the transducer 1 remaining supported on the washer 9.
- This preload residual allows the conical end 7 of the rod 4 to be applied to the area 6 of the nozzle 3, the contact force then being maintained by the elasticity of the rod 4 and washer 9 assembly.
- the prestressing applied allows a share the sealing of the opening 21 of the nozzle 3 when the fluid 16 is supplied with a given pressure and on the other hand the wear compensation possible in the contact area of the valve 7 with the nozzle 3.
- the elasticity of the material from which the washer 9 is formed is chosen from so that it makes it possible to make up for variations in length between the rod 4 and the nozzle 3 due to thermal expansions without effective modification of the value of the prestress ensuring watertightness.
- the mass of the transducer and the rigidity of the washer 9 are chosen to form a system with a very large response time compared at excitation times of the transducer of the order of 1 to 20 milliseconds to the maximum.
- the material of which the cup is made can be based on polymers with a very high rate of attenuation of elastic deformations in dynamics.
- the amplitude of oscillation for a voltage of 60 volts applied to each electrode is close to 20 micrometers, thus leaving an opening 5 generating a fluid film whose thickness is of the same order (20 microns).
- This fluid film is fragmented by the closing of the opening 21 which occurs after a very short time (every 20 ⁇ s).
- the device thus makes it possible to generate, as required, very fine droplets.
- the modulation of the amplitude of the opening 21 makes it possible to modulate the size of the drops and thus the flow rate with response times of around 20 ⁇ s.
- the flow section through opening 21 is greater than that of flow limiter 26 and the injector flow is then a function of the pressure and the flow section of the flow limiter 26.
- the quantities injected are precisely controlled by the number of opening cycles and the size drops by the displacement value.
- the flow section through opening 21 is lower than that of the flow limiter 26 and the instantaneous flow of the injector is then a function at each oscillation of the pressure and the section of passage generated by the opening 21.
- the quantities injected are controlled in this case by the amplitude of displacement and by the number of oscillation ordered, the minimum quantity injected can be further reduced and the increased liquid nebulization rate.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims (8)
- Dispositif d'injection de carburant pour moteur à combustion interne du type qui comporte un boítier d'injection (15) alimenté en carburant se terminant par une buse cylindrique (3) à l'extrémité de laquelle est ménagé un orifice d'injection (21), un transducteur (1) de mise en vibration cyclique disposé à l'intérieur du boítier et piloté en durée et en intensité par le système électronique de contrôle moteur, et des moyens obturateurs (7) disposés à l'extrémité (6) de la buse (3) rappelés par des moyens élastiques de rappel contre ladite extrémité (6), caractérisé en ce que les moyens élastiques de rappel sont composés d'une part d'une tige (4) traversant le corps du dispositif d'injection jusqu'à une zone (8) où ladite tige est solidaire du transducteur (1) et solidarisant les moyens obturateurs au transducteur, et d'autre part de moyens d'amortissement (9) de l'ensemble solidaire formé par le transducteur (1), la tige (4) et les moyens obturateurs (7) de sorte que les moyens obturateurs sont rappelés contre l'extrémité (6) de la buse, la mise en vibration du transducteur générant une déformation alternée en contraction et dilatation dans la tige (4) de sorte qu'à chaque cycle de vibration la dilatation subie par la tige se traduit par un allongement de ladite tige générant un déplacement des moyens obturateurs (7), solidaires élastiquement de ladite tige, par rapport à l'extrémité de la buse (6), lequel déplacement permet de faire apparaítre pendant la durée du cycle une fente (21) par laquelle est éjecté une quantité de carburant déterminée.
- Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce les moyens obturateurs (7) formant clapet sont ramenés contre l'extrémité de la buse (6) après chaque ouverture par la contraction de la tige (4) qui suit la dilatation de ladite tige au cours de chaque cycle de vibration.
- Dispositif d'injection de carburant selon les revendications 1 à 2, caractérisé en ce que les moyens obturateurs formant clapet (7) restent plaqués contre l'extrémité de la buse (6) en dehors des phases de déformations de la tige (4) grâce au moyen de rappel élastique et amortissant (9) ramenant l'ensemble du transducteur (1), de la tige (4) et des moyens obturateurs (7) contre l'extrémité de la buse (6) formant un siège pour le clapet.
- Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que les moyens obturateurs formés par l'extrémité évasée formant clapet (7) de la tige (4) sont solidaires élastiquement avec ladite tige (4), laquelle tige (4) est montée mobile axialement à l'intérieur du transducteur (1) et est elle-même solidaire élastiquement avec ce même transducteur (1) dans une zone (8) située dans la partie supérieure (2) du transducteur (1).
- Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que les moyens de rappel élastique et amortissant (9) servant à appliquer les moyens obtursteurs (7) contre l,extrémité de la buse (6) et supportant l'ensemble du transducteur (1) et de la tige (4) sont composés dans un matériau permettant d'amortir la transmission de vibrations entre le transducteur (1) et le corps du boítier d'injection (15).
- Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que la masse du transducteur (1) associée avec la pièce (9) d'amortissement constituent un système dissipatif ayant un temps de réponse très grand par rapport aux durées d'excitation du transducteur (1), de sorte que les déformations de la tige et les chocs se produisant au niveau du siège (6) n'induisent pas de mise en mouvement du corps du transducteur (1), seule l'extrémité de la partie supérieure (2) du transducteur oscille de part et d'autre de la position d'équilibre initiale, ces oscillations étant transmises dans la tige (4).
- Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que les moyens de rappel élastique et amortissant (9) servant à appliquer les moyens obturateurs (7) contre l'extrémité de la buse (6) permettent de rattraper les jeux éventuels dus aux dilatations thermiques entre le transducteur (1), la tige (4) et la buse (3) sans modification effective de la précontrainte assurant l'étanchéité.
- Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que les quantités de carburant délivrées par l'injecteur peuvent être commandées de deux manières consistant à commander un déplacement du clapet (7)a) au-delà d'une valeur seuil, auquel cas la section débitante par l'ouverture (21) est supérieure à celle du limiteur de débit (26) et le débit de l'injecteur est alors fonction de la pression et de la section de passage du limiteur de débit (26) de sorte que les quantités injectées sont contrôlées précisément par le nombre de cycles d'ouverture du clapet (7),b) en dessous de la valeur seuil citée plus haut, la section débitante par l'ouverture (21) est inférieure à celle du limiteur de débit (26) et le débit instantané de l'injecteur est alors fonction à chaque oscillation de la pression et de la section de passage générée par l'ouverture (21) de sorte que les quantités injectées sont contrôlées dans ce cas par l'amplitude de déplacement et par le nombre d'oscillation commandées permettant ainsi de réduire encore la quantité minimale injectée et d'augmenter le taux de nébulisation du liquide.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0009190 | 2000-07-13 | ||
FR0009190A FR2811717B1 (fr) | 2000-07-13 | 2000-07-13 | Dispositif d'injection de carburant pour moteur a combustion interne |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1172552A1 true EP1172552A1 (fr) | 2002-01-16 |
EP1172552B1 EP1172552B1 (fr) | 2006-11-22 |
Family
ID=8852465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010401853 Expired - Lifetime EP1172552B1 (fr) | 2000-07-13 | 2001-07-11 | Dispositif d'injection de carburant pour moteur à combustion interne |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1172552B1 (fr) |
DE (1) | DE60124630T2 (fr) |
ES (1) | ES2270969T3 (fr) |
FR (1) | FR2811717B1 (fr) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2854439A1 (fr) * | 2003-04-30 | 2004-11-05 | Renault Sa | Dispositif d'injection de carburant pour moteur a combustion interne |
FR2854664A1 (fr) * | 2003-05-09 | 2004-11-12 | Renault Sa | Dispositif d'injection de fluide |
FR2857418A1 (fr) * | 2003-07-10 | 2005-01-14 | Renault Sa | Dispositif d'application de precontrainte a une soupape d'un injecteur de carburant et moyens de rupture d'impedance acoustique de l'injecteur |
WO2005069719A2 (fr) * | 2004-01-21 | 2005-08-04 | Kuzmenkov, Dmitriy | Technique d'alimentation en carburant de la chambre de combustion et de l'injecteur d'un moteur a combustion interne |
EP1705722A2 (fr) | 2005-03-24 | 2006-09-27 | Ngk Spark Plug Co., Ltd. | Elément piézoélectrique multicouche, injecteur avec l'élément et méthode de production d'un élément piézoélectrique |
WO2007039677A1 (fr) * | 2005-10-03 | 2007-04-12 | Renault S.A.S. | Dispositif de mise en vibration cyclique d'une buse injecteur |
FR2918123A1 (fr) | 2007-06-27 | 2009-01-02 | Renault Sas | Dispositif d'injection de fluide. |
FR2922289A1 (fr) * | 2007-10-16 | 2009-04-17 | Renault Sas | Dispositif d'injection de fluide |
FR2923573A3 (fr) | 2007-11-14 | 2009-05-15 | Renault Sas | Dispositif d'injection de fluide |
FR2927120A1 (fr) * | 2008-02-06 | 2009-08-07 | Renault Sas | Moteur a combustion interne comportant un bol de combustion pour un injecteur de type ultrasonore |
FR2927121A1 (fr) * | 2008-02-06 | 2009-08-07 | Renault Sas | Moteur a combustion interne comportant un bol de combustion a double cavite pour un injecteur ultrasonore |
WO2011138562A1 (fr) * | 2010-05-06 | 2011-11-10 | Renault S.A.S. | Procede de fabrication d'un actionneur a empilement de couches alternees d'electrode intercalaire et de materiau piezoelectrique |
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US4389999A (en) * | 1980-08-18 | 1983-06-28 | Rockwell International Corporation | Ultrasonic check valve and diesel fuel injector |
US4428531A (en) * | 1979-09-11 | 1984-01-31 | Eaton Corporation | Method of producing a fuel injector |
DE3942449A1 (de) * | 1989-12-22 | 1991-07-04 | Daimler Benz Ag | Kraftstoffeinspritzanlage fuer brennkraftmaschinen, insbesondere gemischverdichtende brennkraftmaschinen |
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- 2000-07-13 FR FR0009190A patent/FR2811717B1/fr not_active Expired - Lifetime
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2001
- 2001-07-11 ES ES01401853T patent/ES2270969T3/es not_active Expired - Lifetime
- 2001-07-11 EP EP20010401853 patent/EP1172552B1/fr not_active Expired - Lifetime
- 2001-07-11 DE DE2001624630 patent/DE60124630T2/de not_active Expired - Lifetime
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US4428531A (en) * | 1979-09-11 | 1984-01-31 | Eaton Corporation | Method of producing a fuel injector |
US4389999A (en) * | 1980-08-18 | 1983-06-28 | Rockwell International Corporation | Ultrasonic check valve and diesel fuel injector |
DE3942449A1 (de) * | 1989-12-22 | 1991-07-04 | Daimler Benz Ag | Kraftstoffeinspritzanlage fuer brennkraftmaschinen, insbesondere gemischverdichtende brennkraftmaschinen |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2854439A1 (fr) * | 2003-04-30 | 2004-11-05 | Renault Sa | Dispositif d'injection de carburant pour moteur a combustion interne |
US7311273B2 (en) | 2003-05-09 | 2007-12-25 | Renault S.A.S. | Fluid injection device |
FR2854664A1 (fr) * | 2003-05-09 | 2004-11-12 | Renault Sa | Dispositif d'injection de fluide |
WO2004101985A2 (fr) * | 2003-05-09 | 2004-11-25 | Renault S.A.S. | Dispositif d’injection de fluide |
WO2004101985A3 (fr) * | 2003-05-09 | 2005-01-27 | Renault Sa | Dispositif d’injection de fluide |
FR2857418A1 (fr) * | 2003-07-10 | 2005-01-14 | Renault Sa | Dispositif d'application de precontrainte a une soupape d'un injecteur de carburant et moyens de rupture d'impedance acoustique de l'injecteur |
WO2005069719A2 (fr) * | 2004-01-21 | 2005-08-04 | Kuzmenkov, Dmitriy | Technique d'alimentation en carburant de la chambre de combustion et de l'injecteur d'un moteur a combustion interne |
WO2005069719A3 (fr) * | 2004-01-21 | 2006-03-23 | Kuzmenkov Dmitriy | Technique d'alimentation en carburant de la chambre de combustion et de l'injecteur d'un moteur a combustion interne |
US7492075B2 (en) | 2005-03-24 | 2009-02-17 | Ngk Spark Plug Co., Ltd. | Multilayer piezoelectric element, fuel injector having the piezoelectric element and piezoelectric element production method |
EP1705722A3 (fr) * | 2005-03-24 | 2007-01-03 | Ngk Spark Plug Co., Ltd. | Elément piézoélectrique multicouche, injecteur avec l'élément et méthode de production d'un élément piézoélectrique |
EP1705722A2 (fr) | 2005-03-24 | 2006-09-27 | Ngk Spark Plug Co., Ltd. | Elément piézoélectrique multicouche, injecteur avec l'élément et méthode de production d'un élément piézoélectrique |
WO2007039677A1 (fr) * | 2005-10-03 | 2007-04-12 | Renault S.A.S. | Dispositif de mise en vibration cyclique d'une buse injecteur |
FR2918123A1 (fr) | 2007-06-27 | 2009-01-02 | Renault Sas | Dispositif d'injection de fluide. |
FR2922289A1 (fr) * | 2007-10-16 | 2009-04-17 | Renault Sas | Dispositif d'injection de fluide |
WO2009053651A2 (fr) * | 2007-10-16 | 2009-04-30 | Renault S.A.S | Dispositif d'injection de fluide |
WO2009053651A3 (fr) * | 2007-10-16 | 2009-07-23 | Renault Sa | Dispositif d'injection de fluide |
FR2923573A3 (fr) | 2007-11-14 | 2009-05-15 | Renault Sas | Dispositif d'injection de fluide |
FR2927120A1 (fr) * | 2008-02-06 | 2009-08-07 | Renault Sas | Moteur a combustion interne comportant un bol de combustion pour un injecteur de type ultrasonore |
FR2927121A1 (fr) * | 2008-02-06 | 2009-08-07 | Renault Sas | Moteur a combustion interne comportant un bol de combustion a double cavite pour un injecteur ultrasonore |
WO2009101341A1 (fr) * | 2008-02-06 | 2009-08-20 | Renault S.A.S. | Moteur a combustion interne comportant un bol de combustion a double cavite pour un injecteur ultrasonore |
WO2009101318A1 (fr) * | 2008-02-06 | 2009-08-20 | Renault S.A.S. | Moteur a combustion interne comportant un bol de combustion pour un injecteur de type ultrasonore |
WO2011138562A1 (fr) * | 2010-05-06 | 2011-11-10 | Renault S.A.S. | Procede de fabrication d'un actionneur a empilement de couches alternees d'electrode intercalaire et de materiau piezoelectrique |
FR2959877A1 (fr) * | 2010-05-06 | 2011-11-11 | Renault Sa | Procede de fabrication d'un actionneur a empilement de couches alternees d'electrode intercalaire et de materiau piezoelectrique |
CN102918672A (zh) * | 2010-05-06 | 2013-02-06 | 雷诺股份公司 | 制造有一堆压电材料和中间电极的交错层的致动器的方法 |
US9082979B2 (en) | 2010-05-06 | 2015-07-14 | Renault S.A.S. | Process for producing an actuator having a stack of alternating intermediate electrode layers and piezoelectric material layers |
CN102918672B (zh) * | 2010-05-06 | 2015-09-09 | 雷诺股份公司 | 制造有一堆压电材料和中间电极的交错层的致动器的方法 |
Also Published As
Publication number | Publication date |
---|---|
FR2811717A1 (fr) | 2002-01-18 |
DE60124630T2 (de) | 2007-09-13 |
DE60124630D1 (de) | 2007-01-04 |
ES2270969T3 (es) | 2007-04-16 |
FR2811717B1 (fr) | 2002-10-04 |
EP1172552B1 (fr) | 2006-11-22 |
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