WO2009007596A2 - Dispositif d'injection de fluide - Google Patents
Dispositif d'injection de fluide Download PDFInfo
- Publication number
- WO2009007596A2 WO2009007596A2 PCT/FR2008/051147 FR2008051147W WO2009007596A2 WO 2009007596 A2 WO2009007596 A2 WO 2009007596A2 FR 2008051147 W FR2008051147 W FR 2008051147W WO 2009007596 A2 WO2009007596 A2 WO 2009007596A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stack
- needle
- injection device
- housing
- actuator
- Prior art date
Links
- 238000002347 injection Methods 0.000 title claims abstract description 32
- 239000007924 injection Substances 0.000 title claims abstract description 32
- 239000012530 fluid Substances 0.000 title claims abstract description 10
- 239000011263 electroactive material Substances 0.000 claims abstract description 27
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 230000005284 excitation Effects 0.000 claims description 3
- 230000036316 preload Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 230000014509 gene expression Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
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- 230000001902 propagating effect Effects 0.000 description 3
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- 229910001374 Invar Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
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- 230000006835 compression Effects 0.000 description 1
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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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/10—Other injectors with multiple-part delivery, e.g. with vibrating valves
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/08—Injectors peculiar thereto
-
- 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
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
-
- 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
- F02M2200/85—Mounting of fuel injection apparatus
- F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws
Definitions
- the invention relates to a device for injecting a fluid, for example a fuel, in particular for an internal combustion engine.
- the invention relates, according to a first aspect, to a fluid injection device, said injector, having a main axis of injection and comprising at least:
- an actuator axially mounted in the housing and having a stack with two axially opposite end faces and including at least one electroactive part comprising an electroactive material
- prestressing means adapted to preload at least partially said stack
- a prestressing means adapted to prestress said stack and, in particular, an electroactive material, for example, piezoelectric ceramic washers or magnetostrictive elements distributed in the stack, is well known to those skilled in the art as shown, for example, European patent application EP 1 172 552.
- the establishment of this prestressing means requires drilling of the electroactive material which weakens it.
- the ceramic washers crack and break easily during drilling, and / or assembly, and / or operation of the injector thereby reducing its service life.
- the present invention which is based on this original observation, is primarily intended to provide a fluid injection device for at least reducing at least one of the limitations mentioned above.
- the injection device which is also in accordance with the generic definition given in the preamble above, is essentially characterized in that the prestressing means comprises at least one clamping flange external to the stack and disposed between the stack and the housing.
- the drilling of the electroactive material is no longer essential, which makes it less fragile, in particular, to mechanical stresses, for example, during assembly and / or operation of the injector.
- the presence of the clamping flange between the stack and the housing protects the stack against unintentional contact and / or crumbling with the housing, for example, during assembly of the injector, which may be damaged by for example, the spatial distribution of the electrodes with their wires, or even the ceramic material itself.
- the invention relates to an internal combustion engine using the fluid injection device according to the invention, that is to say, such a motor where is disposed this injection device.
- FIG. 1 is a diagram of an injection device according to the invention arranged in a motor and equipped with a so-called outgoing head needle connected to an actuator mounted axially in a housing,
- FIG. 2 is a diagram of an injection device according to the invention arranged in the engine and equipped with an incoming said head needle connected to the actuator
- FIGS. 3 and 4 represent diagrams illustrating a functioning of the valve. formed by a nozzle and an outgoing needle: closed valve ( Figure 3); open flap (figure 4),
- Figures 5 and 6 show diagrams illustrating an operation of the valve formed by a nozzle and an incoming needle needle: closed valve (Figure 5); open flap (figure 6),
- FIG. 7 schematically shows, in simplified side view, the stack prestressed by a clamping clamp external to the stack and arranged between the stack and the casing,
- FIG. 8 schematically represents a simplified section of the injector in a plane perpendicular to an axis of symmetry of the injector
- FIGS. 9-11 diagrammatically show in simplified side views respectively three different diagrams of the stack prestressed by clamping clamps of different structure, an axial clamping force adjusting means of the stack being arranged axially between each flange and the stack,
- FIGS. 12-14 schematically show in simplified side views respectively three different diagrams of the stack prestressed by structural clamps; different, the adjustment means completed by an elastic means being disposed axially between each flange and the stack,
- FIG. 15 schematically shows a side view in partial longitudinal section of a one-piece needle in the form of a cylindrical bar
- Figure 16 schematically shows a simplified side view in partial longitudinal section a cylindrical one-piece nozzle.
- the invention relates to an injection device, or injector, for injecting a fluid, for example a fuel 131 into a combustion chamber 15 of an internal combustion engine 151 (FIG. 1 (or 2) ), or in an air intake duct (not shown), or in an exhaust gas duct (not shown).
- a fluid for example a fuel 131 into a combustion chamber 15 of an internal combustion engine 151 (FIG. 1 (or 2) ), or in an air intake duct (not shown), or in an exhaust gas duct (not shown).
- the injector comprises two bodies, for example, cylindrical.
- a first body representing a housing 1 is extended, along a preferred axis AB of the injection device, for example, its axis of symmetry, by at least one nozzle 3 having a length along the axis AB and having an orifice of injection and a seat 5 (or 5 ').
- the linear dimensions of the housing 1, for example, its width measured perpendicularly to the axis AB and / or its length measured along the axis AB, may be greater than those of the nozzle 3.
- the density of the housing 1 may greater than that of the nozzle 3.
- the housing 1 can be connected to at least one fuel circuit 131 131 via at least one opening 9.
- the fuel circuit 131 comprises a fuel treatment device 13 131 comprising, for example, a tank, a pump, a filter.
- a second body representing an actuator 2 is axially mounted, preferably movable, in the housing 1.
- a needle 4 has, along the axis AB, a length and a first end 6 defining a valve in a zone of contact with the seat 5 (or 5 ') of the nozzle 3.
- the linear dimensions of the actuator for example, its width measured perpendicular to the axis AB and / or its measured length along the axis AB, may be greater than those of the needle 4.
- the density of the actuator 2 may be greater than that of the needle 4.
- the needle 4 and the actuator 2 are connected between them by a junction zone ZJ ( Figure 2).
- the first end 6 is preferably extended longitudinally, along the axis AB, opposite the actuator 2, by a head 7 (or T) closing the seat 5 (or 5 '), so as to ensure a better seal of the valve of the injector.
- the actuator 2 is extended, along the axis AB, by the needle 4, and is arranged for a direct vibration of the needle 4 with a reference period ⁇ , thus ensuring between the first end 6 of the needle 4 and the seat 5 (or 5 ') of the nozzle 3 a relative axial movement to open and close alternately the valve, as shown in Figures 3-4 and 5-6.
- the actuator 2 thus plays a role of an active "master” driving the needle 4 which then presents itself as a passive "slave” piloted.
- the actuator 2 has a stack with two opposite end faces C, D axially and including at least one electroactive part 22 comprising an electroactive material 221 (FIGS. 7-14).
- the stack can be confused with the actuator 2.
- the stack comprises at least one part, called amplifier
- the amplifier 21 may have a substantially cylindrical shape (FIGS. 7, 9-10, 12-13). Alternatively, the amplifier 21 may have another shape, for example, frustoconical, which narrows in the direction of the oriented axis AB of the electroactive portion 22 to the needle 4 ( Figure 11, 14).
- the stack further comprises at least one other part 23, called the rear mass 23, which plays a homogeneous distribution role of the stresses on the electroactive material 221.
- the amplifier 21 and the rear mass 23 are arranged axially on either side of the the electroactive portion 22.
- the rear mass 23 has a wall axially opposed to the electroactive portion 22, said wall being merged with the front face C of the stack axially opposed to the needle 4.
- the amplifier 21, the electroactive part 22 and the rear mass 23 are, on the one hand, clamped together by a prestressing means adapted to preload at least partially said stack, and, on the other hand, adapted to be traversed by acoustic waves initiated by the vibrations of the electroactive part 22.
- the prestressing means comprises at least one clamping flange 25 external to the stack and arranged between the stack and the casing 1.
- the electroactive material 221 is piezoelectric which may be, for example, one or more ceramic piezoelectric washers stacked axially on each other to form the electroactive portion 22 of the stack.
- These selective deformations are controlled by corresponding excitation means 14 adapted to turn the electroactive part 22 of FIG.
- the vibration stack with the reference period ⁇ for example, using an electric field created by an applied potential difference, via the wires (not shown), to electrodes 220 integral with the material electroactive 221 piezoelectric.
- the electroactive material 221 may be magnetostrictive. The selective deformations of the latter are controlled by corresponding unrepresented excitation means, for example, by means of a magnetic induction resulting from a selective magnetic field obtained using, for example, an exciter not shown, and in particular by a coil integral, for example, the stack or other coil surrounding the stack.
- the prestressing means comprises at least one axial force adjusting means 250 for clamping the stack.
- This allows the prestressing means to clamp the electroactive portion 22, for example, between the rear mass 23 and the amplifier 21, as illustrated in FIGS. 1 and 2, with a "case-by-case" adjustable force as a function of for example, the piezoelectric or magnetostrictive nature of the electroactive material 221 and / or the section in a plane perpendicular to the AB axis of the piezoelectric ceramic washers or magnetostrictive elements in the stack, and / or the spatial distribution said washers in the stack, and / or their shapes, and / or their linear dimensions (and / or in fine their shapes).
- the adjusting means 250 may be connected with the clamping flange 25 (FIGS. 1, 2, 7, 9-14). In particular, it is possible to provide that the adjusting means
- the axial positioning of the adjusting means 250 contributes to preserving a structural and / or acoustic symmetry of a "needle 4 + actuator 2" assembly so that, respectively, neither movements reciprocating axial axes of the needle 4, nor the propagation of acoustic waves as a whole
- the clamping flange 25 has a thermal expansion (in particular, a coefficient of thermal expansion) substantially identical to that of the stack and, in particular that of the electroactive material 221.
- a thermal expansion in particular, a coefficient of thermal expansion
- the difference between the coefficients of Expansion of the electroactive material 221 and the materials of the stack can be chosen so that the differential expansions of these parts do not induce, within the operating temperature range of the injector, a variation of the prestressing of the electroactive material 221. greater than 10% of the nominal stress value (induced by the prestressing means 250).
- the clamping flange 25 may be made of an alloy of iron and nickel with carbon and chromium, for example, of alloy "invar" type.
- the prestressing of the electroactive material 221 tends to remain constant regardless of the temperature variations of the injector.
- the same expansion of the stack (and, in particular, the electroactive material 221 and that of the clamping flange 25) provides a thermal compensation for the expansions due to temperature variations of the injector.
- the assembly of the stack and, therefore, the actuator 2 becomes faster because no other means is required to compensate for said thermal expansions.
- the rear mass 23 may be merged with the adjusting means 250 (not shown in the figures).
- the clamping flange 25 may have a thermal expansion (in particular, a coefficient of thermal expansion) different from that of the stack and, in particular, that of the electroactive material 221.
- the prestressing means comprises at least one elastic means 251 (for example, at least one rubber seal, a spring washer, a spring) disposed between the clamping flange 25 and the stack.
- the elastic means 251 makes it possible to ensure quasi-constant prestressing of the electroactive part 22 and, in particular, of the electroactive material 221, independently of the elongations of the clamping flange 25 due to the thermal expansions. Thanks to this arrangement, it is possible to continue assembling the stack and, therefore, the actuator 2, on an industrial scale, for example, when a stock out of the clamps 25 in invar . Thus, this embodiment contributes to making the manufacture of the injector more reliable.
- the elastic means 251 is disposed between the stack and the adjusting means 250 ( Figures 7, 12-14), so as to make the assembly of the stack faster.
- the adjusting means 250 is in the form of a screw, preferably a threaded screw, the clamping flange 25 having a corresponding, preferably central, bore, that is to say, aligned on the AB axis and tapped ( Figures 7, 9-14).
- clamping flange 25 is supported on the two opposite end faces C, D of the stack (FIG. 7), so as to ensure a homogeneous distribution of the stresses during clamping of the stack.
- the amplifier 21 may have at least one narrowing segment along the axis AB oriented towards the needle 4, for example, a connecting segment 211 with the electroactive portion 22.
- the clamping flange 25 can marry at least partially the shape of said narrowing segment of the amplifier 21, as illustrated in Figures 10-11, 13-14. This makes it possible to reduce an axial length of the clamping flange 25 as can be seen by comparing respectively the clamps 25 in FIGS. 9 and 12 with those in FIGS. 10-11 and 13-14. This possibility of shortening the clamping flange 25 makes it possible either to make the lighter flanges (all other parameters of the flange remaining unchanged) or to be more resistant (for example, by proportionally increasing a thickness of the shortened flange) to mechanical wear. and / or high clamping forces.
- the prestressing means may comprise a plurality of clamping flanges 25 arranged symmetrically around the stack and spaced apart radially from each other at a predetermined angle measured in a plane perpendicular to the axis AB.
- the presence of several flanges ensures the homogeneous distribution of stresses during tightening of the stack.
- FIG. 1 illustrates the case of the needle 4 with the so-called outgoing head 7, having a diverging (preferably frustoconical) flared shape in a direction of the oriented axis AB of the casing 1 towards the outside of the nozzle 3 in the combustion chamber 15.
- the outgoing head 7 closes the seat 5 of the outer side of the nozzle 3 facing away from the housing 1, in the direction of the axis AB.
- FIG. 2 illustrates the case of the needle 4 with the so-called tapered, preferably frustoconical, head T going narrowing in the direction of the oriented axis AB of the casing 1 towards the outside of the nozzle 3 and closing off the seat 5 'on the inside of the nozzle 3 facing the housing 1.
- Returning means 11 (or 11 ') of the actuator 2 may be provided to hold the head 7 (or T) of the needle 4 in abutment with the seat 5 (or 5') of the nozzle 3, so as to to ensure the closure of the valve regardless of the pressure in the combustion chamber 15.
- the clamping flange 25 and the housing 1 may have minus a longitudinal contact zone, represented with the aid of the dotted lines referenced UW in FIG. 8. The possible presence of the longitudinal contact zone UW can make assembly of the injector easier, in particular by protecting the electrodes 220 against any unexpected contact with the housing 1, for example, during insertion of the stack into the housing 1 during assembly of the injector provided with the needle 4 to 7 outgoing head taking care to control friction and alignments.
- the nozzle 3 with the housing 1 and the needle 4 with the actuator 2 respectively form a first and a second acoustic wave propagation medium.
- the pilot injector moves the first end 6 of the needle 4 while the seat (represented in a simplified manner in the figures 15-16 and referenced 50) of the nozzle 3 is kept dynamically stationary or fixed thus behaving as a displacement node.
- the needle 4 and the nozzle 3 are each a body whose radial dimensions perpendicular to the axis AB are small relative to its length along the axis AB.
- any variation in linear acoustic impedance I induces an echo, i.e., a weakening of the acoustic wave propagating in one direction of the bar (e.g., from right to left in Figs. 15-16) by another acoustic wave propagating in the opposite direction of the bar (for example, from left to right in FIGS. 15-16) from a linear impedance variation point I, for example, at a junction between the needle 4 and the actuator 2 ( Figure 15) or at another junction between the nozzle 3 and the housing 1 ( Figure 16).
- an echo i.e., a weakening of the acoustic wave propagating in one direction of the bar (e.g., from right to left in Figs. 15-16) by another acoustic wave propagating in the opposite direction of the bar (for example, from left to right in FIGS. 15-16) from a linear impedance variation point I, for example, at a junction between the needle 4 and the actuator 2 ( Figure 15) or
- break to be understood as "a linear impedance variation I exceeding a predetermined threshold representative of a difference between the linear impedance upstream and that downstream from the acoustic wave propagation direction, a linear impedance breaking zone located in an acoustic wave propagation medium at a small distance in front of the wavelength, preferably less than one-eighth of the wavelength ⁇ / 8 ".
- the injector may comprise at least one linear acoustic impedance breaking zone, existing at a distance from the contact zone of the seat 50 with the first end 6 of the needle 4 along the nozzle 3 (FIG. housing 1, and at least one other zone of linear acoustic impedance breaking existing away from the contact area of the first end 6 with the seat 50 along the needle 4 ( Figure 15) or the actuator 2.
- Said zone and other rupture zone of linear acoustic impedance being each first in order from said contact zone between the first end 6 of the needle 4 and the seat 50, in a propagation direction of acoustic waves directed respectively to the housing 1 and the actuator 2.
- T A n A * [ ⁇ / 2], (E2) where ⁇ A is another multiplier coefficient, nonzero positive integer, said second multiplier coefficient, for example, n A ⁇ n B.
- T B n B * [ ⁇ / 2] ⁇ 0.2 * [ ⁇ / 2] (AND)
- the latter may correspond, for example, to the head 7 (or T) of the needle 4 and / or to a guiding boss (not shown) in a plane perpendicular to the axis AB of the end 6 of the needle 3 in the nozzle 3.
- Maintaining the dynamically immobile seat 5 is obtained by maintaining its longitudinal speed along the axis AB equal to zero, taking advantage of the periodicity of the phenomenon of the propagation of acoustic waves.
- the latter generates an acoustic wave, called incident wave, associating a jump of speed ⁇ v and a stress jump ⁇ .
- This wave propagates in the nozzle 3 towards the casing 1 by traversing the first distance L B , then is reflected in the first linear acoustic impedance breaking zone which is merged in FIG.
- the incident wave reflected, its echo, said reflected wave returns to the nozzle 3 to browse the first distance I_ B in the opposite direction, that is to say, from the housing 1 to the seat 5.
- the reflected wave has the same sign of the stress jump ⁇ as the incident wave and the inverse sign of the jump of speed ⁇ v that the incident wave (the direction of propagation being reversed, the jump of speed ⁇ v changed sign if we consider now all the positive velocities in the direction arriving on the seat 5 and not in the direction of propagation waves).
- n B ⁇ n A it is the incident waves and the reflected waves shifted by a few periods ⁇ offset each other in the seat 5 to make it dynamically fixed.
- This compensation may not be complete when, for example, the difference between n B and n A is greater than a predetermined value and / or a dissipation of the acoustic waves in the nozzle 3 (and, ultimately, its linear acoustic impedance) , exceeds a certain threshold.
- the latter is due to the presence of vibration, for example, ultrasonic, of the setpoint period ⁇ , initiated by the electroactive portion 22 of the stack coincident with the actuator 2 in the present example, as mentioned above.
- a first acoustic limit for defining both the first I_ B and the second I_ A distances is represented by an end of a set in question ("nozzle 3 + housing 1" or “needle 4 + actuator 2 ").
- this first acoustic limit merges with the zone of contact between the first end 6 of the needle 4 (possibly extended axially by the head 7 (or 7 ')) and the seat 5 (or 5 ') of the nozzle 3, as shown in Figure 1 (or 2).
- the first acoustic limit used to determine the second distance I_ A related to the second medium "needle 4 + actuator 2" of propagation of the acoustic waves is taken at the mid-height of the outgoing diverging frustoconical head 7.
- the first acoustic limit used to determine the second distance L A in relation to the second medium "needle 4 + actuator 2" acoustic wave propagation is taken at the mid-height of the head entering convergent t-cone.
- the second acoustic limit specific to each of the two sets is represented by the respective first linear acoustic impedance breaking zone I, as detailed above.
- the second acoustic limit may correspond to where the diameter of the assembly in question varies in a plane perpendicular to the axis AB, for example, at the junction zone ZJ of the needle 4 with the amplifier 21 of the stack or recess SX of the nozzle 3 in the housing 1 (FIG. 1, 2), it being understood that:
- the needle 4 and the amplifier 21 are made, for example, by machining in a monobloc piece made of material preferably having the same density and the same speed of sound, and
- the nozzle 3 and the housing 1 are made, for example, by machining in a monobloc piece of material preferably having the same density and the same velocity of sound.
- the acoustic limits of bodies may not match their physical limits. Indeed, besides the geometry of the bodies, the acoustic properties translated, for example, using the linear acoustic impedance discussed above, also depend on the other parameters such as the density of the bodies and the speed of sound in the bodies.
- n is a multiplier coefficient, nonzero positive integer, said third multiplier coefficient, for example, n ⁇ n B ⁇ n A.
- the actuator 2 can therefore have a symmetrical acoustic structure such as an echo of an acoustic wave emitted in one place of the symmetrical stack tends to return, after one or more reflections at the stacking boundaries represented by the opposite end faces C, D in Figures 1-2, 7, 9-14, in this same place for transmitting the acoustic wave a non-zero positive integer number of periods after its emission.
- a first reflected wave that is to say, a first echo of the wave emitted to the first face D, returns to this same first face D a period later after its emission.
- the symmetrical resonant structure of the actuator 2 therefore generates no delay, nor change of sign of the waves - in particular for that of the sinusoidal type where a part of the sinusoid in positive follows a symmetrical part of the sinusoid in negative - emitted with the first face D whatever the source of these waves (of the needle 4 or actuator 2).
- the symmetrical resonant structure of the actuator 2 thus contributes to an orderly operation of the injector.
- equation referenced E3 By analogy with the equations referenced E1 and E2 above, it must be understood that the equation referenced E3 above must be considered as verified with a certain tolerance to take account of manufacturing constraints, for example, to a tolerance of the order of ⁇ 10% of the reference period ⁇ , that is to say, of the order of plus or minus ⁇ 20% of the half-period ⁇ / 2. Taking into account this tolerance, the equation referenced E3 above can be rewritten as follows:
- the length L f (T) expressed in acoustic flight time T and measured on corresponding parts manufactured on an industrial scale, may have slight variations from the reference values calculated at using E3 above. These slight variations may be due to an effect of reported masses. The latter may correspond, for example, appendages or machining operations or assembly.
- the resilient means 251 has an impedance linear low and the acoustic waves are reflected at the face C forming an interface between the rear mass 23 and the elastic means 251 so that no acoustic wave coming axially from the rear mass 23 enters the adjustment means 250 through the elastic means 251.
- the rupture of the linear acoustic impedance between the rear mass 23 and the elastic means 251 is total, so there is no longer any continuity of the acoustic medium between the rear mass 23 and the adjustment means 250 as shown in Figures 7, 12-14.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2008801040795A CN101784784B (zh) | 2007-06-27 | 2008-06-25 | 流体喷射装置 |
EP08806079A EP2158398A2 (fr) | 2007-06-27 | 2008-06-25 | Dispositif d'injection de fluide |
US12/666,312 US20100187329A1 (en) | 2007-06-27 | 2008-06-25 | Fluid injection device |
JP2010514061A JP2010531410A (ja) | 2007-06-27 | 2008-06-25 | 流体噴射装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0704636A FR2918123A1 (fr) | 2007-06-27 | 2007-06-27 | Dispositif d'injection de fluide. |
FR0704636 | 2007-06-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009007596A2 true WO2009007596A2 (fr) | 2009-01-15 |
WO2009007596A3 WO2009007596A3 (fr) | 2009-03-26 |
Family
ID=38924767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2008/051147 WO2009007596A2 (fr) | 2007-06-27 | 2008-06-25 | Dispositif d'injection de fluide |
Country Status (8)
Country | Link |
---|---|
US (1) | US20100187329A1 (fr) |
EP (1) | EP2158398A2 (fr) |
JP (1) | JP2010531410A (fr) |
KR (1) | KR20100040735A (fr) |
CN (1) | CN101784784B (fr) |
FR (1) | FR2918123A1 (fr) |
RU (1) | RU2457353C2 (fr) |
WO (1) | WO2009007596A2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009053651A2 (fr) * | 2007-10-16 | 2009-04-30 | Renault S.A.S | Dispositif d'injection de fluide |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2936025A1 (fr) * | 2008-09-16 | 2010-03-19 | Renault Sas | Dispositif d'injection de fuide. |
FR2949247B1 (fr) * | 2009-08-24 | 2011-09-16 | Renault Sa | Systeme de montage d'un dispositif d'injection a aiguille resonnante. |
FR2978301B1 (fr) | 2011-07-18 | 2013-08-02 | Renault Sa | Procede d'assemblage d'un transducteur ultrasonore et transducteur obtenu par le procede |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19650900A1 (de) * | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | Piezoelektrischer Aktuator |
DE19826341A1 (de) * | 1998-06-12 | 1999-12-16 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
EP1079097A2 (fr) * | 1999-08-20 | 2001-02-28 | Delphi Technologies, Inc. | Boítier d'actionneur |
DE19951012A1 (de) * | 1999-10-22 | 2001-04-26 | Bosch Gmbh Robert | Aktor |
DE10310296A1 (de) * | 2003-03-10 | 2004-09-23 | Robert Bosch Gmbh | Verfahren zum Einstellen des Hubes eines piezoelektrischen oder elektrostriktiven Aktors sowie Vorrichtung zur Durchführung des Verfahrens |
WO2005035971A1 (fr) * | 2003-10-14 | 2005-04-21 | Siemens Aktiengesellschaft | Actionneur piezoelectrique et procede de production associe |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03249374A (ja) * | 1990-02-28 | 1991-11-07 | Aisin Seiki Co Ltd | 燃料噴射装置 |
WO1992001955A1 (fr) * | 1990-07-16 | 1992-02-06 | Atlantic Richfield Company | Transducteur de force de torsion et procede de fonctionnement |
RU2013634C1 (ru) * | 1991-06-27 | 1994-05-30 | Юрий Владимирович Седов | Ультразвуковой распылитель жидкого топлива системы питания двигателя внутреннего сгорания |
DE19843570A1 (de) * | 1998-09-23 | 2000-03-30 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
JP4292653B2 (ja) * | 1999-10-12 | 2009-07-08 | 株式会社デンソー | ピエゾアクチュエータ、ピエゾ制御弁、ピエゾインジェクタ |
FR2811717B1 (fr) | 2000-07-13 | 2002-10-04 | Renault | Dispositif d'injection de carburant pour moteur a combustion interne |
JP4841048B2 (ja) * | 2001-03-29 | 2011-12-21 | 京セラ株式会社 | アクチュエータ及び噴射装置 |
JP4889156B2 (ja) * | 2001-03-29 | 2012-03-07 | 京セラ株式会社 | アクチュエータ及び噴射装置 |
DE10250917B3 (de) * | 2002-10-31 | 2004-06-03 | Siemens Ag | Verfahren zum Betrieb eines Einspritzventils mit einem piezoelektrischen Aktor sowie Steuergerät |
JP2005291128A (ja) * | 2004-04-01 | 2005-10-20 | Nippon Soken Inc | インジェクタ |
DE102004021920A1 (de) * | 2004-05-04 | 2005-12-01 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
JP2006303444A (ja) * | 2005-03-24 | 2006-11-02 | Ngk Spark Plug Co Ltd | 積層型圧電素子の製造方法、積層型圧電素子及びこれを用いた燃料噴射装置 |
RU2293873C1 (ru) * | 2005-06-23 | 2007-02-20 | Московский государственный открытый университет (МГОУ) | Клапан для дозирования топлива в двигатель внутреннего сгорания с силовым многослойным пьезокерамическим приводом затвора |
FR2888889B1 (fr) * | 2005-07-20 | 2007-08-31 | Renault Sas | Dispositif d'injection de carburant pour moteur a combustion interne |
FR2889257B1 (fr) * | 2005-08-01 | 2007-11-02 | Renault Sas | Dispositif d'injection de carburant et procede de commande d'un tel dispositif |
FR2895031B1 (fr) * | 2005-12-19 | 2011-06-03 | Renault Sas | Injecteur de carburant pour moteur a combustion interne |
-
2007
- 2007-06-27 FR FR0704636A patent/FR2918123A1/fr active Pending
-
2008
- 2008-06-25 CN CN2008801040795A patent/CN101784784B/zh not_active Expired - Fee Related
- 2008-06-25 JP JP2010514061A patent/JP2010531410A/ja not_active Ceased
- 2008-06-25 EP EP08806079A patent/EP2158398A2/fr not_active Withdrawn
- 2008-06-25 WO PCT/FR2008/051147 patent/WO2009007596A2/fr active Application Filing
- 2008-06-25 RU RU2010102516/06A patent/RU2457353C2/ru not_active IP Right Cessation
- 2008-06-25 KR KR1020107001761A patent/KR20100040735A/ko not_active Application Discontinuation
- 2008-06-25 US US12/666,312 patent/US20100187329A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19650900A1 (de) * | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | Piezoelektrischer Aktuator |
DE19826341A1 (de) * | 1998-06-12 | 1999-12-16 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
EP1079097A2 (fr) * | 1999-08-20 | 2001-02-28 | Delphi Technologies, Inc. | Boítier d'actionneur |
DE19951012A1 (de) * | 1999-10-22 | 2001-04-26 | Bosch Gmbh Robert | Aktor |
DE10310296A1 (de) * | 2003-03-10 | 2004-09-23 | Robert Bosch Gmbh | Verfahren zum Einstellen des Hubes eines piezoelektrischen oder elektrostriktiven Aktors sowie Vorrichtung zur Durchführung des Verfahrens |
WO2005035971A1 (fr) * | 2003-10-14 | 2005-04-21 | Siemens Aktiengesellschaft | Actionneur piezoelectrique et procede de production associe |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Also Published As
Publication number | Publication date |
---|---|
FR2918123A1 (fr) | 2009-01-02 |
CN101784784A (zh) | 2010-07-21 |
KR20100040735A (ko) | 2010-04-20 |
JP2010531410A (ja) | 2010-09-24 |
RU2457353C2 (ru) | 2012-07-27 |
RU2010102516A (ru) | 2011-08-10 |
WO2009007596A3 (fr) | 2009-03-26 |
US20100187329A1 (en) | 2010-07-29 |
EP2158398A2 (fr) | 2010-03-03 |
CN101784784B (zh) | 2011-12-28 |
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