EP1172552B1 - Brennstoffeinspritzvorrichtung für eine Brennkraftmaschine - Google Patents

Brennstoffeinspritzvorrichtung für eine Brennkraftmaschine Download PDF

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Publication number
EP1172552B1
EP1172552B1 EP20010401853 EP01401853A EP1172552B1 EP 1172552 B1 EP1172552 B1 EP 1172552B1 EP 20010401853 EP20010401853 EP 20010401853 EP 01401853 A EP01401853 A EP 01401853A EP 1172552 B1 EP1172552 B1 EP 1172552B1
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EP
European Patent Office
Prior art keywords
rod
transducer
nozzle
shut
injection device
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Expired - Lifetime
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EP20010401853
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English (en)
French (fr)
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EP1172552A1 (de
Inventor
André AGNERAY
Laurent Serge François Levin
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Renault SAS
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Renault SAS
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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
    • 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 fuel injection device for an 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.
  • the fuel injection devices currently used on internal combustion engines fitted to motor vehicles or road vehicles operate conventionally on the model of a valve whose open or closed state is permanently controlled, the dosage of the fuel injected then being done directly by the opening time.
  • Such injection systems comprise an electric fuel supply pump which supplies, through the channel of a distribution manifold, all the injectors under a given pressure. By electronically controlling the actuator of the valve of each injector, it controls the start and the duration of opening thereof and then determines a precise amount of fuel injected.
  • Electromagnetically controlled needle-type injectors have limitations that inhibit engine performance. In particular the time taken to open or close the needles are still too high, about 1 to 2 ms, which prevents to phase the injection ideally on all motor 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 injection orifices of relatively large diameters to allow the required quantities of fuel to be discharged for operations at full load and high engine speeds. This arrangement generates fuel jets having drops of large dimensions, which slows the vaporization of the fuel (and therefore the preparation of the fuel mixture) and is able to promote the wetting phenomenon of the walls.
  • injection devices comprising a system for opening the needle by translation associated with a secondary jet spray system at the outlet of the ejection nose, in these devices the liquid web flows continuously during the entire opening time and is refragmented by the vibrations generated in the vicinity of the ejection nose as soon as the contact between the liquid and the end of the nose takes place.
  • a first disadvantage of this type of solution lies in the low atomization capacity of the liquid when the ejected liquid layer is important, see an atomization capacity limited to only one short moment at the beginning of the contact of the liquid layer as well as at the end of the ejection. Between these two moments the contact is made for a period of time too short for the vibrations and displacements generated at the end of the ejection nose can: either be transmitted in the form of a surface wave in the liquid which the nebulize is generated local pulses on the fluid sheet which has the effect of fragmenting the fluid sheet.
  • a second disadvantage of this type of solution is a too long response time due to the opening mode which requires translating the entire mass of the needle.
  • an injection device whose nose vibrates around a frequency of 35 kHz and comprising a ball of a given mass held in abutment against the seat of the injection nose by a prestressing spring. At each oscillation an opening appears between the seat of the injection nose and the ball, thus allowing the ejection of a quantity of fluid for a very short period of time corresponding to the oscillation period, which makes it possible to nebulise the liquid with a high rate.
  • one drawback is that on the one hand the twists of the ball on the seat, and on the other hand the oscillating behavior of the system consisting of the mass of the ball and the prestressing spring, do not allow rigorous control of the ball. vibratory behavior of the nose-ball assembly and therefore the opening moment for dosing the fluid which results in the fuel being injected in an uncontrolled manner.
  • the object of the invention is to propose a new type of fuel injection device to solve all of these problems, the device being able to deliver with a high accuracy and a very short response time a cloud of drops of fuel whose sizes are very close and small enough to ensure the complete and homogeneous vaporization of the injected fuel.
  • the invention achieves its purpose through a fuel injection device as claimed in the appended claim 1.
  • an injection device whose opening at the level of the ejection nose is solely a function of the expanded or compressed state of the valve needle bearing at the level of the nose, the variation of state being generated by an electrically controlled ultrasound excitation source.
  • the oscillations phenomena of mass-spring type are removed.
  • a given amount of elastic deformation energy is transmitted into the stem 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.
  • the oscillations occur at a frequency close to 50 KHz, which makes it possible to generate short opening times and thus to 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 whose flared extremity forms a valve, this rod being mounted axially movable inside the transducer and being elastically fastened with the same transducer, in an area situated in an upper part of the transducer made in the form of cylinder narrower than the rest of the transducer.
  • the shutter means forming a valve are constantly biased against the end of the nozzle serving as a seat for the valve by an elastic return device that can be formed of a damping material, this elastic and damping device supporting the assembly composed by the three elements that are the transducer, the rod and the valve, these three elements being themselves resiliently secured.
  • the shutter means forming a valve are brought against the end 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 by means of elastic and damping return means bringing the entire transducer, the rod and the shutter means against the end of the nozzle forming a seat for the valve.
  • the elastic and damping return means for applying the shutter means against the end of the nozzle and supporting the entire transducer and the rod is made of a material for damping the transmission of vibrations between the transducer and the body of the injection box.
  • the elastic and damping return means for applying the shutter means against the end of the nozzle makes it possible to make up for the possible clearance due to thermal expansion between the transducer, the rod and the injection nozzle, without any effective modification of the prestressing ensuring the seal.
  • the injection housing contains the transducer, the rod and the damping material.
  • a flow restrictor is placed inside the nozzle in the annular space between the rod and the inner cylindrical surface of the nozzle so that during the ejection of the fluid, the flow of liquid passing through the nozzle is defined precisely by the space between the rod and the flow limiter.
  • the cyclic vibrating means of the rod are formed by a transducer comprising a mechanical amplification system and elastically connected to the rod to transmit the amplified deformations.
  • annular guide having channels for the passage of the liquid against which rests the rod so that the shutter means can be moved coaxially with the end of the nozzle.
  • the channels formed in the neck to let the liquid pass can serve as a flow limiter.
  • the transducer has a stack of more than two active components.
  • the active components of the transducer are formed in a piezoelectric material.
  • the active components of the transducer are formed in a magnetostrictive material.
  • the mass of the transducer associated with the damping piece constitutes a dissipative system having a very large response time with respect to the excitation times of the transducer, so that the deformations of the rod and the shocks occurring at the seat induce no setting in motion of the body of the transducer; only the end of the cylinder terminating the transducer at its upper part oscillates on either side of the initial equilibrium position, these oscillations being transmitted in the rod.
  • the body of the injector object of the present invention was detailed.
  • the body of the injector essentially comprises three distinct members cooperating with each other.
  • the first member is composed of the injection box 15, which has an internal cavity 10 intended to be filled with pressurized fuel via an axial drilling 16 of fuel supply coming to connect to a supply circuit of fluid under pressure.
  • the cavity 10 opens at the lower end 6 of the nozzle 3 via an injection orifice 5.
  • the housing 15 has inside a stepped portion 11 on which is disposed a support element 9 made of a damping material, which support member receives the rear portion 18 of a transducer 1.
  • the second member consists of means capable of generating vibrations in a longitudinal mode at ultrasonic frequencies such as a transducer 1, which transducer has a stepped portion 12 serving as a mechanical amplifier and ends in the upper part by a tube of cylindrical shape 2 in which are transmitted the vibrations from the transducer 1, the end of the tube 2 has an 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 housed axially movable inside the nozzle 3 and whose frustoconical lower end 7 extends outside the nozzle 3.
  • This end 7 forming a valve is adapted for contacting 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 to close the fuel injection port.
  • the other end of the rod 4 is elastically connected to the transducer 1 in the 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 mechanical connection with a higher prestressing than the stresses generated in this area during the operation of the transducer.
  • the transducer 1 is placed coaxially with the nozzle 3 via guides 25 in the cavity 10 of the injection box on the support piece 9 formed of a material both damping and elastic.
  • the part 9 terminates in the zone of contact with the stepped portion 11 of the injection box 15 by a washer 14 having very low friction characteristics so that the transducer 1 can be almost free to rotate with respect to the nozzle. injection 3.
  • a preload of a fixed value is exerted between the transducer 1 and the injection housing 15, which prestressing results in a contraction of the material 9 and an additional translation 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 the zone 8.
  • the tube 2 then consists of a solid part made of the material of the rod 4 surrounded by of the material of the emitter part 19 of the transducer, this emitting part preferably being chosen in the same material as the rod 4.
  • the part 9 exerts an elastic restoring force t in order to remove the transducer 1 from the nozzle 3, which causes the end 7 of the rod 4, integral with the transducer 1, to be applied against the seat 6.
  • the mass of the transducer 1 associated with the damping piece 9 constitutes a dissipative system having a very large response time with respect to the excitation times of the transducer 1, so that the deformations of the rod and the shocks occurring at the of the seat 6 do not induce movement of the body of the transducer 1, only the end of the cylinder 2 oscillates on either side of the initial equilibrium position, which oscillations are transmitted in the rod 4.
  • the transducer 1 is sized to transmit a maximum of stresses at the level of the stepped junction 12 with the tube or cylinder 2, this maximum of stresses corresponding to a minimum amplitude of vibration for the material.
  • the transducer 1 comprises a zone 17 consisting of piezoelectric or magnetostrictive active components, which respectively under the application of an electric or magnetic field deform in 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 shaft 20 or a screw.
  • prestressing means such as a threaded shaft 20 or a screw.
  • the stack of several active components 17 makes it possible to add the thickness deformations generated by each of the rings, the resulting deformation of the total displacement of the stack of rings remaining below the limit of elastic deformation of the prestressing means 20.
  • the reduction of the diameter of the part 19 to the part 2 amplifies the longitudinal deformations generated in the part 19 into the zone 8 where the transmission takes place in the rod 4.
  • the motor control computer 33 sends two pulses corresponding to the beginning and at the end of the injection, during this time an ultrasonic frequency generator 32 sends a wave train (level 5V) at a given frequency in accordance with FIG. input of an amplifier 34, which makes it possible to attack the piezoelectric ceramics 17 in alternating voltage (of the order of + -60V) at the same ultrasonic frequency during the injection duration.
  • the assembly composed of the transducer 1 and the rod 4 is sized to resonate with the excitation frequency of the active components 17 and to amplify the longitudinal displacements up to the level of the lower end of the rod 4.
  • the rod 4 initially closing the opening 21 at its end 7 forming a valve, deforms under the impulse supplied 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 makes it possible to oscillate the end 7 and thus to make the opening 21 appear cyclically.
  • Figure 4 describes the position variation of the end 7 of the rod 4 (points Ai) with respect to the end 6 of the nozzle 3 (points Bi) for an oscillation cycle of the resonator assembly.
  • the opening of the annular slot 21 is oscillating and equal to the vibration amplitude of the valve 7 relative to the end 6 as shown in Figure 4.
  • the frequency of opening of the slot depends on the frequency of excitation chosen for the transducer 1.
  • the minimum opening time of the injection device is of the same order as the excitation period applied to the transducer 1, which excitation can be at a few tens of kilohertz, typically 50 kHz, which allows minimum opening times of the order of 20 ⁇ s. This makes it possible to deliver micro-quantities of liquid during a reduced period of time compared to more conventional 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 mode of implantation of an injector according to the invention in an internal combustion engine of a motor vehicle.
  • the fuel supply of the engine is electronically controlled multipoint type by which each combustion chamber 35 is supplied directly with fuel by at least one fuel injector opening into the chamber.
  • the body of the injector 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 at the well 31 of the injector is provided by an O-ring 29 maintained in application between the junction 11 and the edge 30 of the injection well 31.
  • the transducer 1 comprises a cylinder 18 of steel 20 mm in diameter and 25 mm in height having in its upper part a threaded shaft 20.
  • the threaded shaft 20 of the cylinder 18 makes it possible to preload piezoelectric ceramic rings 17 (external diameter 20 mm, internal diameter 6 mm, thickness 2 mm) between the cylinders 18 and the emitting part 19.
  • the ceramics are arranged with parallel polarizations, electrodes 13 being interposed between each pair of ceramic.
  • a titanium rod 4 having a diameter of 2 mm and comprising a conical end 7 with an external diameter of 5 mm is inserted in the axis of the transducer 1.
  • An elastic and damping washer 9 has an orifice allowing the rod 4 to pass and bears on the surface lower 11 of the cavity 10.
  • the rod 4 is secured to the transducer 1 in the zone 8 after having constrained the washer 9 to a certain prestressing value, the transducer 1 remaining resting on the washer 9.
  • This residual preload makes it possible to apply the conical end 7 of the rod 4 on the zone 6 of the nozzle 3, the contact force then being maintained by the elasticity of the assembly of rod 4 and washer 9.
  • the preload applied allows on the one hand the sealing of the opening 21 of the nozzle 3 when the fluid 16 is supplied with a given pressure and secondly the catch of possible wear in the contact zone of the valve 7 with the nozzle 3.
  • the elasticity of the material of which the washer 9 is formed is chosen so that it makes it possible to compensate for variations in length between the rod 4 and the nozzle 3 due to thermal expansion without any effective modification of the value of the prestressing ensuring the seal.
  • the mass of the transducer and the rigidity of the washer 9 are chosen to form a system having a very large response time with respect to the excitation times of the transducer of the order of 1 to 20 milliseconds maximum.
  • the material of which the cup is made may be based on polymers having a very high rate of attenuation of dynamic elastic deformations.
  • the amplitude of oscillation for a voltage of 60 volts applied to each electrode is close to 20 microns, leaving an opening 5 generating a fluid film whose thickness is of the same order (20 microns). This fluid film is fragmented by the closure of the opening 21 which occurs after a very short time (every 20 ⁇ s).
  • the device thus makes it possible to generate, as needed, 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 the order of 20 microseconds.
  • the flow section through the opening 21 is greater than that of the flow restrictor 26 and the flow rate of the injector is then a function of the pressure and
  • the injected quantities are precisely controlled by the number of opening cycles and the size of the drops by the value of the displacement.
  • the flow section through the opening 21 is smaller than that of the flow restrictor 26 and the instantaneous flow rate of the injector is then a function at each oscillation of the pressure and the passage section generated by the opening 21.
  • the injected quantities are controlled by the displacement amplitude and by the number of oscillation controlled, the minimum quantity injected can be further reduced and the increased nebulization rate of the liquid.

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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)

Claims (8)

  1. Brennstoffeinspritzvorrichtung für eine Brennkraftmaschine, umfassend ein Einspritzgehäuse (15), das mit Treibstoff versorgt wird und mit einer zylindrischen Düse (3) endet, an deren Ende eine Einspritzöffnung (5) angeordnet ist, einen Wandler (1) zum Versetzen in zyklische Vibration, der im Inneren des Gehäuses angeordnet ist und hinsichtlich Dauer und Stärke von dem elektronischen Kontrollsystem des Motors gesteuert wird, und Verschlussmittel (7), die am Ende (6) der Düse (3) angeordnet sind und durch elastische Rückstellmittel an das Ende (6) rückgestellt werden, wobei die elastischen Rückstellmittel einerseits aus einer Stange (4), mit der die verschließbaren Mittel (7) verbunden sind und die den Körper der Einspritzvorrichtung bis zu einer Zone (8), in der die Stange mit dem Wandler (1) verbunden ist und die Verschlussmittel mit dem Wandler verbindet, durchquert, und andererseits aus Dämpfungsmitteln (9) für die feste Einheit, die vom Wandler (1), der Stange (4) und den Verschlussmitteln (7) gebildet ist, bestehen, so dass die Verschlussmittel an das Ende (6) der Düse rückgestellt werden, dadurch gekennzeichnet, dass das Versetzen des Wandlers in Vibration zu einer alternierenden Verformung durch Zusammenziehen und Dehnen in der Stange (4) führt, so dass bei jedem Vibrationszyklus die von der Stange durchgemachte Dehnung zu einer Verlängerung der Stange führt, die eine Verschiebung der Verschlussmittel (7), die elastisch mit der Stange verbunden sind, in Bezug auf das Ende der Düse (6) hervorruft, wobei es diese Verschiebung ermöglicht, während der Dauer des Zyklus eine Öffnung (21) aufzumachen, durch die eine bestimmte Brennstoffmenge ausgeworfen wird.
  2. Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Verschlussmittel (7), die eine Klappe bilden, an das Ende der Düse (6) nach jeder Öffnung durch das Zusammenziehen der Stange (4), das auf die Dehnung der Stange während jedes Vibrationszyklus folgt, rückgestellt werden.
  3. Brennstoffeinspritzvorrichtung nach den Ansprüchen 1 bis 2, dadurch gekennzeichnet, dass die eine Klappe (7) bildenden Verschlussmittel an das Ende der Düse (6) außerhalb der Verformungsphasen der Stange (4) dank des elastischen Rückstell- und Dämpfungsmittels (9) angelegt bleiben, das die Einheit des Wandlers (1), der Stange (4) und der Verschlussmittel (7) an das Ende der Düse (6) das einen Sitz für die Klappe bildet, rückstellt.
  4. Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die vom erweiterten, eine Klappe (7) bildenden Ende der Stange (4) gebildeten Verschlussmittel elastisch mit der Stange (4) verbunden sind, wobei die Stange (4) axial beweglich im Inneren des Wandlers (1) montiert und selbst elastisch mit diesem selben Wandler (1) in einer Zone (8) verbunden ist, die sich im oberen Teil (2) des Wandlers (1) befindet.
  5. Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die elastischen Rückstell- und Dämpfungsmittel (9), die dazu dienen, die Verschlussmittel (7) an das Ende der Düse (6) anzulegen und die Einheit des Wandlers (1) und der Stange (4) zu tragen, aus einem Material bestehen, das es ermöglicht, die Übertragung der Vibrationen zwischen dem Wandler (1) und dem Körper des Einspritzgehäuses (15) zu dämpfen.
  6. Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Masse des Wandlers (1) in Verbindung mit dem Dämpfungsteil (9) ein Ableitungssystem darstellen, das eine sehr lange Antwortzeit in Bezug auf die Erregungsdauer des Wandlers (1) hat, so dass die Verformungen der Stange und die im Bereich des Sitzes (6) hervorgerufenen Stöße nicht zu einer Bewegung des Körpers des Wandlers (1) führen, wobei nur das Ende des oberen Teils (2) des Wandlers beiderseits der ursprünglichen Gleichgewichtsposition oszilliert, wobei diese Oszillationen in die Stange (4) übertragen werden.
  7. Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass es die elastischen Rückstell- und Dämpfungsmittel (9), die dazu dienen, die Verschlussmittel (7) an das Ende der Düse (6) anzulegen, ermöglichen, das mögliche Spiel auf Grund der Wärmedehnungen zwischen dem Wandler (1), der Stange (4) und der Düse (3) ohne tatsächliche Änderung der Vorspannung, die die Dichtigkeit sichert, nachzustellen.
  8. Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die von der Einspritzvorrichtung gelieferten Brennstoffmengen auf zwei Arten gesteuert werden können, die darin bestehen, eine Verschiebung der Klappe (7) zu steuern
    a) über einen Grenzwert hinaus, in welchem Fall der Durchgangsquerschnitt durch die Öffnung (21) größer als jener eines Durchflussbegrenzers (26) ist und die Durchflussmenge der Einspritzvorrichtung nun vom Druck und vom Durchgangsquerschnitt des Durchflussbegrenzers (26) abhängt, so dass die eingespritzten Mengen genau durch die Anzahl von Öffnungszyklen der Klappe (7) kontrolliert werden,
    b) unter dem oben genannten Grenzwert, in welchem Fall der Durchgangsquerschnitt durch die Öffnung (21) kleiner als jener des Durchflussbegrenzers (26) ist und die momentane Durchflussmenge der Einspritzvorrichtung nun bei jeder Oszillation vom Druck und vom Durchgangsquerschnitt, der von der Öffnung (21) erzeugt wird, abhängt, so dass die eingespritzten Mengen in diesem Fall durch die Verschiebeamplitude und die Anzahl von gesteuerten Oszillationen kontrolliert werden, wodurch die eingespritzte Mindestmenge weiter verringert und die Nebelbildungsrate der Flüssigkeit erhöht werden kann.
EP20010401853 2000-07-13 2001-07-11 Brennstoffeinspritzvorrichtung für eine Brennkraftmaschine Expired - Lifetime EP1172552B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0009190A FR2811717B1 (fr) 2000-07-13 2000-07-13 Dispositif d'injection de carburant pour moteur a combustion interne
FR0009190 2000-07-13

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EP1172552A1 EP1172552A1 (de) 2002-01-16
EP1172552B1 true EP1172552B1 (de) 2006-11-22

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EP (1) EP1172552B1 (de)
DE (1) DE60124630T2 (de)
ES (1) ES2270969T3 (de)
FR (1) FR2811717B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854439B1 (fr) * 2003-04-30 2007-04-06 Renault Sa Dispositif d'injection de carburant pour moteur a combustion interne
FR2854664B1 (fr) * 2003-05-09 2006-06-30 Renault Sa Dispositif d'injection de fluide
FR2857418B1 (fr) * 2003-07-10 2007-04-06 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
EA200400065A1 (ru) * 2004-01-21 2004-10-28 Кузьменков, Дмитрий Васильевич Способ подачи топлива в камеру сгорания двигателя внутреннего сгорания и форсунка
JP2006303443A (ja) 2005-03-24 2006-11-02 Ngk Spark Plug Co Ltd 積層型圧電素子、これを用いた燃料噴射装置、及び積層型圧電素子の製造方法
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
FR2927120B1 (fr) * 2008-02-06 2010-02-12 Renault Sas Moteur a combustion interne comportant un bol de combustion pour un injecteur de type ultrasonore
FR2927121B1 (fr) * 2008-02-06 2010-02-12 Renault Sas Moteur a combustion interne comportant un bol de combustion a double cavite pour un injecteur ultrasonore
FR2959877B1 (fr) * 2010-05-06 2013-06-14 Renault Sa Procede de fabrication d'un actionneur a empilement de couches alternees d'electrode intercalaire et de materiau piezoelectrique

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FR2488655A2 (fr) * 1980-08-18 1982-02-19 Rockwell International Corp Injecteur de carburant equipe d'un clapet de retenue a vibrations ultra-sonores, notamment pour moteur diesel
DE3942449A1 (de) * 1989-12-22 1991-07-04 Daimler Benz Ag Kraftstoffeinspritzanlage fuer brennkraftmaschinen, insbesondere gemischverdichtende brennkraftmaschinen

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ES2270969T3 (es) 2007-04-16
DE60124630D1 (de) 2007-01-04
FR2811717A1 (fr) 2002-01-18
FR2811717B1 (fr) 2002-10-04
DE60124630T2 (de) 2007-09-13
EP1172552A1 (de) 2002-01-16

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