• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A fuel injector (10) comprising a needle (16) movable between a fully open position (PO) and a closed position (PF) is provided with a needle position locating device (82) in which a electrical circuit (84) is closed in the two extreme positions (PO, PF), the needle (16) being in electrical contact with the ground (M), the circuit (84) being open in any other intermediate position (Pi) of the needle (16), the needle (16) not being grounded (M).
    公开号:FR3024183A1
    申请号:FR1457078
    申请日:2014-07-22
    公开日:2016-01-29
    发明作者:Philippe Legrand
    申请人:Delphi International Operations Luxembourg SARL；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The invention relates to a fuel injector provided with a device for detecting the position of the needle. BACKGROUND OF THE INVENTION A fuel injector conventionally comprises a needle controlled opening and closing depending on the pressure in a control chamber, which pressure is a function of the position of a control solenoid valve. These small displacements are carried out at high speed and, the regularly increased performances now require for an optimal control a feedback as to the real position of the needle. Devices are known in which a sensor is arranged on the injector or an injector in which the surfaces of the components of the body are electrically insulated so that a measurement of electrical resistance can be made between two elements of the body of the injector . These complex and expensive devices have not yet proven their industrial realism and should be offered a simple and effective device.
    [0002] SUMMARY OF THE INVENTION The present invention proposes to at least partially solve these problems by proposing a fuel injector comprising an injector body in which are arranged a movable needle between a fully open position and a closed position and a soliciting spring. continuously the needle to the closed position, the injector being arranged so that in use the injector body is in electrical contact with the electrical ground. The injector is further provided with a device for locating the position of the needle in which an electrical circuit is closed when the needle is in the fully open position and also when the needle is in the closed position.
    [0003] The needle is then in electrical contact with the mass, the circuit being open in any other intermediate position of the needle, the needle not being grounded. More particularly, the circuit comprises the injector body, the needle and the spring and an electrical connection extending from the spring to an end outside the injector, such as a terminal of a connector. Thus an electrical measurement can be made between said outer end and ground. In more detail, the injector includes, inter alia, a nozzle and a control valve, the nozzle itself including a nozzle body, a top guide and a bottom guide, a valve body seat, and pilot holes. injection. The nozzle also comprises the needle which extends between a first end provided with a needle seat and a second end forming the head of the needle, the needle being slidably arranged between the top guide and the bottom guide. and able to move between the closed position in which the needle seat is in contact with the valve body seat, the fuel injection being prevented and, the fully open position in which the needle seat is moved away from the valve body seat injection being possible. The nozzle also comprises the compressed metal spring between a support surface integral with the nozzle body and a shoulder of the needle. The control valve comprises a valve body arranged fixed on the nozzle body so as to define together a control chamber in which the head of the needle is located, the movements of the needle being a function of the pressure variations in the nozzle. the control chamber so that in the fully open position, the top of the needle head is in contact with a wall of the control chamber, said wall forming the ceiling of the control chamber.
    [0004] The injector body comprises inter alia the nozzle body and the valve body. The device for locating the position of the needle makes it possible to generate a variable electrical signal representative of the position of the needle. The device comprises electrical insulation of the surfaces of the needle, or surfaces of the injector body, which may be in contact with each other, except for the needle seat and the seat of the needle. valve body, the top of the needle head and the ceiling of the control chamber and, the spring support shoulder on the needle. On the other hand, the other spring support face, bearing surface integral with the nozzle body, is electrically insulated.
    [0005] In a specific construction mode, the top guide is integrated with the nozzle body, the interface between the nozzle body and the valve body being planar. The electrical circuit further includes a planar disc-shaped member arranged between the nozzle body and the valve body. The disc is provided with an opening 3024183 3 located at the right of the control chamber, the opening being slightly smaller than the control chamber so that the disc penetrates slightly into the control chamber and extends to the periphery from the ceiling of the control room. The disc is formed of a metal disc provided on its two opposite sides 5 of an electrical insulating coating except for the periphery of the opening located at the periphery of the ceiling surface without insulation against which the spring is in support . Thus in the fully open position, the needle head extends through the opening and its top is in contact with the ceiling of the control chamber. Note that the insulating coating can be obtained via the deposition of a layer of material or via a suitable surface treatment. The planar disk is provided with positioning apertures and protuberances extending perpendicularly to the plane of the disc from the periphery. said positioning apertures so as to complement each other in blind positioning holes provided in the valve body and in the nozzle body. According to one embodiment of the flat disk, the protuberances are obtained by folding at right angles cut portions of the disk. In another embodiment, the disk may be flat and centering means, such as pins, may be reported on the disk.
    [0006] The electrical connection further comprises an intermediate connection link passing through a sealed conduit passing through the valve body. The connection link extends from an end connected to the metal disk to said outer end, for example a terminal of a connector. According to another embodiment of the injector, the top guide is an independent piece arranged fixed between the nozzle body and the valve body, the spring is compressed between a bearing face integrated with the needle and a face. solidarity support of the high guide. The electrical connection includes an annular disc interposed between the spring and the top guide, the interface between the annular disk and the top guide being electrically insulated, the needle passing through a central opening of the annular disk. The top guide is then provided with a conduit passing therethrough, a connecting lug being shaped to extend from the annular disk into said conduit.
    [0007] Alternatively, the electrical connection includes an intermediate connection link extending through a sealed and electrically insulated conduit extending through the valve body to an end connected to the annular disk. Regardless of the embodiment, the electrical resistance between the needle and the ground is less than 1k ohms when the circuit is closed and is greater than 100 kOhms, or even 400 kOhms, when the circuit is open. The important thing is that there is a big difference between the open circuit and closed circuit resistance values so that the discrimination is easy.
    [0008] DESCRIPTION OF THE FIGURES An embodiment of the invention is now described by way of the following figures. Figure 1 is an axial section of an injector according to a first embodiment of the invention, the injector being in the closed position.
    [0009] Figure 2 is the injector of Figure 1 in the open position. Figure 3 is a magnified axial section of the injector of Figure 1. Figure 4 is a magnified axial section of an injector according to a second embodiment. FIGS. 5 and 6 are two alternative embodiments of a component of the injector of FIG. 4. FIG. 7 is an isometric view of the disk arranged in the injector of FIG. 3. FIG. 8 is a circuit diagram representative of the invention.
    [0010] DESCRIPTION OF THE PREFERRED EMBODIMENTS According to FIGS. 1, 2 and 3, there is described a first embodiment of the invention relating to a fuel injector 10, here a diesel injector, although the invention is fully transferable to a fuel injector. gas injector or any other fuel, the injector 10 generally forming part of an injection system 30 12 comprising several injectors 10. The description will detail the elements of the invention and will remain more succinct and general as to the surrounding elements. The injector 10 extends along a main axis A and comprises, from the bottom upwards, according to the conventional and non-limiting sense of the figures, a nozzle 14 comprising a needle 16 arranged in a nozzle body 18 and then a valve 20 of the control body 20 arranged in an actuator body 26. The nozzle bodies 18, the valve body 22 and the actuator body 26 are held together by a nut 5 injector 28 which bears on a shoulder of the nozzle body 18 and is screwed on the actuator body 26, the valve body 22 being sandwiched between the two other bodies, the three bodies and the nut forming the injector body 29. The nozzle body 18 includes an inner axial bore extending from an upper end, where it widens slightly to a deep counterbore 10 to define in part a control chamber 32, up to a low end 34 closing in tip of s to provide a conical valve body seat 36 for controlling access of fuel to injection holes 38 extending through the conical wall of the nozzle body 18. Between the control chamber 32 and the seat With the valve body 36, the bore 30 forms a high cylindrical guide 40 and a low cylindrical guide 42 between which the needle 16 is arranged axially slidably. The terms "high" and "low" are used here not only in reference to the orientation of the figure, but also in reference to the usual name given to these elements by professionals. The needle 16 is generally cylindrical and extends axially A between a needle head 44, at the top of the figure, and a pointed end 46, at the bottom of the figure, forming a needle seat 48 cooperating with the needle. Valve body seat 36 of the body 18. As seen in Figure 3, the needle head 44 opens into the control chamber 32. The head 44 has a diameter d44, smaller than the rest of the needle 16, and extends upwardly from a shoulder 50 to a top-end surface 52. The body of the control valve 22 is conventionally arranged above the nozzle body 18, also the underside 54 of the Does the valve body form in its central part the ceiling 56 of the control chamber 32. In the control chamber 32, a metal spring 58 bears against the shoulder 50 of the needle so as to urge continuously the needle 16 to a closed position PF in which the needle seat 48 is in co ntact tight against the valve body seat 36 of the body. The valve body 22 is, moreover, conventionally provided with a bore 6224183 opening on a wide space 62, a magnetic armature assembly and valve stem 64 being conventionally slidably mounted in the bore 60, said assembly 64 having generally the shape of a T, the upper bar representing a magnetic armature and the vertical leg representing a valve stem.
    [0011] In parallel with the bore 60, the valve body 22 is traversed right through by an open conduit 66 shown to the right in the section of FIG. 3 although, as will be explained further on, the duct could be made of a another location of the valve body 22, provided that it opens from one side to the other. The actuator body 26 conventionally arranged above the control valve 20 is provided with a complementary conduit 68 arranged to align with the opening conduit 66 of the valve body and extend to a connector 70 arranged at the top of the actuator body 26. The injector 10 is moreover conventionally provided with a circulation circuit 72 of the fuel which on the one hand allows the supply of the high pressure fuel via a high pressure circuit 74, fed from an inlet mouth to the injection holes 38 and, on the other hand, the recirculation of fuel to a low pressure reservoir via a low pressure circuit 76. The high pressure circuit 74 comprises in particular a bypass channel 78 leading to the control chamber 32, chamber 32 from which starts the low pressure circuit 76 via a discharge channel 80 controlled in opening and closing by the control valve 20. When the actuator 24, typically an electromagnet, is elec triquement fed, it attracts the magnetic armature 64 which opens the evacuation channel 80 and allows the fuel trapped in the control chamber 32 to evacuate to the low pressure circuit 76. The pressure in the control chamber 36 decreases then and the needle 16 moves in the bore 30 of the nozzle body 18 to a fully open position PO in which the needle seat 48 is moved away from the valve body seat 36, so as to allow the injection of fuel via the injection holes 38, and wherein the top 52 of the needle head is in contact with the ceiling surface 56 of the control chamber 32.
    [0012] When the actuator 24 is not energized, the magnetic armature and valve stem assembly 64 is urged by a valve spring to a position in which the evacuation channel 80 is closed which retains in the control chamber 32 the high-pressure fuel that gets there. The pressure in the control chamber 32 then rises and the needle 16, pushed back by the spring 58 and the pressure in the control chamber 32, moves to the closed position PF in which the needle seat 48 is in sealing contact with the valve body seat 36 so as to prevent fuel injection and wherein the top 52 of the needle head is remote from the ceiling surface 58 of the control chamber. The injector 10 further comprises a device 82 for identifying the extreme positions of the needle. The device 82 is an electrical circuit 84 for making an electrical measurement ME between a lug 86 of the connector and the mass M to which the nozzle body 18, the valve body 22, the actuator body 26 and the When the needle 16 is in the closed position PF, FIG. 1, the electrical circuit 84 comprises an electrical connection 88 which extends from the lug 86 to the spring 58, then the spring 58 itself. then the needle 16 to the needle seat 48 and finally the nozzle body 18 from the valve body seat 36 to the mass M. When the needle 16 is in the fully open position PO, FIG. 2, the electrical circuit 84 comprises the electrical connection 88 of the lug 84 to the spring 58, then the spring 58 itself, then the needle 16 to its top 52 of the head, then the valve body 22 from the ceiling 56 from the control chamber to the ground M. In these two extreme positions PO, PF, the circuit Electrical 84 is closed and an electrical measurement can be made, said measurement being significant from an extreme position. An injection cycle includes not only a main opening in which the needle 16 traverses the entire displacement between the two extreme positions, but also short openings during which the needle 16 leaves the closed position PF but n It does not reach the fully open position PO and stops at an intermediate position Pi, said ballistic position. In the ballistic position the needle seat 48 is away from the valve body seat 36 and the top 52 of the needle head is away from the ceiling 56 of the control chamber so that the electrical circuit 84 is open. The measurement MIE electrical 3024183 8 is then different from that performed when the circuit 84 is closed. To distinguish the needle positions, the electrical measurement made is related to the electrical control of the actuator. Thus, when the circuit 84 is closed, if the actuator is electrically powered then the needle is in fully open position PO and if the actuator is not powered, the needle 16 is in the closed position PF and, if the actuator is electrically powered only to control a short opening, then the circuit 84 initially closed, opens when the needle leaves the closed position PF and then the circuit 84 closes again. which indicates that the needle 16 has returned to the closed position PF without opening fully. FIG. 8 is now briefly described an example of an electrical circuit for acquiring and measuring the signal representative of the position 15 of the needle 16. The injector 10 is shown schematically according to an electrical circuit 84 comprising, between the lug 86 and the mass M, the needle 16 schematically as a switch in parallel which is placed an insulation resistance Ri. The insulation resistance Ri has a value typically greater than 100 kOhms so that in the closed position PF the electrical resistance of the circuit 84 is zero and in the open position PO the electrical resistance of the circuit 84 is the resistance of the circuit. Ri insulation. In addition, the injector 10 is connected to an ECU calculator comprising a fixed electrical resistance Re, which is much smaller than the insulation resistance Ri, it may for example be chosen a fixed resistor Re whose value lies between 10 25 and 50 kOhms, for example 20 kOhms, two other electrical resistors R1, R2, and a voltage comparator. At the terminals of the voltage comparator come firstly a first reference voltage whose level is a function of the combination of the two other electrical resistances R1, R2, and secondly a second voltage varying according to the Open or closed state of the circuit 84. To vary this second voltage, the comparator terminal is also connected to the lug 86 of the injector 10. Thus, in closed position PF this terminal receives a zero voltage because it is located connected to the ground M and in the open position PO the same terminal 3024183 9 receives a non-zero voltage and greater than the reference voltage. The change thus perceived by the voltage comparator informs of the position of the needle 16. Alternatively, a measurement of the current flowing in the electric circuit of the injector would make it possible to identify the open position PO or the closed position PF of the needle. The electrical circuit 84 is now detailed. It comprises on the one hand the electrical insulation of the surfaces of the needle 16 which may be in contact with the nozzle body 18. Thus, the surfaces S1 and S2 guided respectively in the top 40 and bottom 42 guides are coated with an insulating surface coating Rie. Among the known deposits are aluminum nitride, aluminum oxide, amorphous carbon "DLC", there are also plastic materials with high mechanical properties, alternatively electrical insulation of the surfaces can be achieved by methods surface oxidation or surface nitriding.
    [0013] Additional sleeves arranged around the needle, or in the injector body, may also be envisaged. On the other hand, the needle seat 48, the top 52 of the head and the shoulder 50 against which the spring 58 rests remain electrically conductive and devoid of an insulating coating Rie, but these surfaces may have other surface coatings both They are electrically conductive. A possible alternative is to isolate almost all the needle by reserving only the three surfaces mentioned above. In another alternative, the insulating coating Rie coats the corresponding surfaces of the nozzle body 18, including the top 40 and bottom 42 guides, or even the surfaces of the nozzle body and the surfaces of the needle. In this case, at the deposit, it will sometimes be preferred the arrangement of insulating sleeves reported in the bores. On the other hand, the electrical connection 88 of the electrical circuit 84 comprises a high link 90 which extends through the actuator body 26 into the complementary conduit 68 and, through the valve body 22 into the emerging conduit 66, then a disc-shaped member 92 arranged between the valve body 22 and the nozzle body 18. The disc 92 is provided with an opening 94 arranged in line with the control chamber 32, the opening 94 being central in the example of FIG. 3. The opening 94 is slightly smaller than the control chamber 32 so that the disk extends towards the inside of the control chamber, around the ceiling 56. This extension 3024183 10 device 96 is sufficient for its lower face 98 serve as a bearing face to the spring 58 which is compressed between the bearing surface 98 and the shoulder 50 of the needle. On the other hand, the opening 94 is wide enough that in the fully open position PO of the needle 16, the head 44 can pass through the opening 90 without touching its edge and coming into contact with the ceiling 56 of the control chamber 32. More specifically, the disc 92 is a metal disc whose two opposite faces are electrically insulated Rie except the bearing face 98 of the spring and, of course, the connection with the high link 90 which remain electrically conductive. Alternatively, the opposite faces of the disk 92 may be electrically conductive but in this case are the faces of the valve body and the nozzle body in contact with the disk 92 which must be electrically insulated. As is particularly visible in the non-limiting example of FIG. 7, the disk 92 is provided with other complementary openings, in particular so as not to close the high pressure circuit 74 leading to the control chamber 32 or to the holes of FIG. injection 38. Necessary openings to the fuel circulation circuits and two symmetrical openings 120 for positioning the nozzle body 18 with respect to the valve body 22 can be distinguished. It is known to accurately position the valve body and the valve body. nozzle body by means of centering pins. This solution can be extended in the context of the present invention, the pins passing through said positioning openings 120 to be arranged in the nozzle body and in the valve body in complementary blind bores. These pins must then be electrically isolated from the disk 92. However, as shown in FIG. 7, it is possible to make said positioning apertures 120 by making diagonal cuts and then folding perpendicularly and on both sides. disc 92 of the triangular portions forming centering wedges 122 adapted to engage complementarily in said blind bores and thus advantageously replacing the centering pins. These centering wedges must also be electrically isolated so as not to create an electrical connection between the disk 92 and the valve body or the nozzle body. Alternatively, other cuts may lead to other forms of centering protuberances.
    [0014] In addition, given the very high pressures, several thousand bars, likely to reign in the injector, it is also possible to improve the seal around the disc 92 by producing in the disk 92 wide openings 124 allowing thus to reduce the surface of the disk 92 subjected to the clamping forces between the nozzle body 18 and the valve body 22 and, consequently, to increase the contact pressures allowing a better seal around the high pressure channels. and the control chamber. In this case, the cutouts which are known to be produced for the same purpose in the faces of the valve body and of the nozzle body are advantageously replaced by these large openings 124 in the disc 92. In a complementary alternative, the walls Laterals of the control chamber may be electrically insulated so as not to risk creating a short circuit between an intermediate coil of the spring 58 and said wall.
    [0015] A second embodiment is now described, with reference to Figs. 4, 5 and 6, and by way of difference with the first mode retaining the reference numbers of the common elements. The principle of the second mode is identical to that of the first mode, however, the second embodiment is distinguished mainly by the very structure of the injector 10 in which the top guide 40 is an independent piece 100 arranged between the nozzle body 18 and the valve body 22 and held fixed by the compression exerted by the injector nut 28. The high guide 100 guides the needle head 44 through a guide bore 102 and, in combination with the Valve body 22, said guide bore 102 defines control chamber 32. As can be seen, bottom guide 42 is close to needle seats 48 and valve 36, and electrically insulated surfaces are within, non-limiting example chosen, limited to the guide surfaces Si, S2. On the other hand, the needle 16 is provided with an annular protuberance whose upper face, directed towards the needle head, plays a role similar to the shoulder 50 of the first embodiment, shoulder 50 against which the spring 58 is in support and urges the needle 16 to the closed position PF. The spring 58 is thus arranged under the high guide 100, and no longer in the control chamber 32, and it is compressed against said shoulder 50. The high guide 100 is further provided with a through duct substantially parallel to the shoulder 50. guide bore 102, through which extends an intermediate connecting link 104 which can be either integrated with the high link 90 and simply extend it to below the high guide 100, or independent of the high link 90 and be connected to this one. Beyond the high guide 100, the electrical circuit 84 comprises a disc part 106 comprising a disc 108 provided with a central opening 110, annular disc 108 of which extends outwardly a connecting lug 112. The annular disc 108 is arranged between the top guide 100 and the spring 58, the needle 16 extending through the opening 110. The lower face 114 of the disc serves as a bearing surface for the spring 58 while the connecting lug 112 is corresponding to the profile of the top guide 100, as shown in Figure 5, to join the intermediate connection link 104 souse guide 100. The disc piece 106 is metallic and coated with an electrical insulation coating Rie, except the bearing surface 114 of the spring and the end of the lug 112 electrically connected to the intermediate connecting link 104. In an alternative shown in FIG. 6, the intermediate connection link 104 takes the form of a rigid pin. 'ed tending in a straight line parallel to the main axis A and the lug 112 is only a small protrusion of the annular disc 108. One could even replace the disc piece 106 by a single washer whose inside diameter would be sufficient to pass the needle 16 and the outer diameter would be large enough to accommodate the intermediate connection 104 while maintaining a passage section sufficient for the fuel not generating restriction and pressure drop. In this case the washer is devoid of tab. When the needle 16 is in the closed position PF, the electrical circuit 84 is closed and comprises the high link 90 and the intermediate connecting link 104, then the disc piece 106, then the spring 58, then the needle 16 to needle seat 48 30 and finally the nozzle body 18 from the valve body seat 36 to the mass M. When the needle 16 is in fully open position PO the electrical circuit 84 is also closed and includes the link high 90 and intermediate link connection 3024183 13, then disc piece 106, then spring 58, then the needle to the top 52 of the head, then the valve body 22 from the ceiling 56 of the chamber control up to mass M.
    [0016] The following references have been used in the description. 10 injector 12 injection system 14 nozzle 16 needle 10 18 nozzle body 20 control valve 22 valve body 24 actuator 26 actuator body 15 28 injector nut 29 injector body 30 bore 32 control chamber 34 bottom end 20 36 valve body seat 38 injection holes high guide 42 low guide 44 needle head 25 46 pointed end 48 needle seat 50 shoulder 52 needle head tip 54 lower face of the valve body 30 56 ceiling of the control chamber 58 spring 60 main bore of the valve body 62 wider gap for the reinforcement 3024183 14 64 magnetic reinforcement assembly and valve stem 66 conduit opening into the valve body 68 complementary conduit in the body of actuator 70 connector 5 72 fuel circulation system 74 high pressure circuit 76 low pressure circuit 78 bypass channel 80 evacuation channel 10 82 device for locating the position of the needle 84 circuit electrical 86 terminal 88 electrical connection 90 connection link 15 92 disc-shaped member 94 central opening of the disc 96 peripheral extension 98 spring bearing face 100 independent high guide 20 102 guide bore of the top guide 104 intermediate connection link 106 disc piece 108 annular disk 110 central opening of disc 25 112 connecting tab 114 spring bearing surface 120 positioning openings 122 centering wedges 124 large openings 30 A Main shaft d44 head diameter PF closed position of needle 3024183 PO fully open position Pi intermediate position M mass MIE electrical measurement 5 Rie electrically insulating coating ECU calculator Valim supply voltage Ri insulation resistance Re electrical resistance 10 R1 / R2 other electrical resistors 15
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Fuel injector (10) comprising an injector body (29) in which are arranged a needle (16) movable between a fully open position (PO) and a closed position (PF) and, a spring (58) permanently requesting the needle (16) towards the closed position (PF), the injector (10) being arranged such that in use the injector body (29) is in electrical contact with the electrical ground (M), characterized in that the injector (10) is further provided with a needle position locating device (82) in which an electrical circuit (84) is closed when the needle (16) is in a fully open position (PO) and also when the needle (16) is in the closed position (PF), the needle (16) then being in electrical contact with the mass (M), the circuit (84) being open in any other intermediate position (Pi) of the needle (16), the needle (16) not being grounded (M).
    [0002]
    2. Fuel injector (10) according to the preceding claim wherein the circuit (84) comprises the injector body (29), the needle (16) and the spring (58).
    [0003]
    The fuel injector (10) according to any one of the preceding claims wherein the circuit (84) further comprises an electrical connection (84, 90, 92, 104, 106) extending from the spring (58) to a outer end (86) to the injector, such as a lug (86) of a connector (70), so that an electrical measurement (ME) can be made between said outer end (86) and the ground (M) .
    [0004]
    The fuel injector (10) according to any one of the preceding claims comprising a nozzle (14) and a control valve (20); the nozzle (14) comprising a nozzle body (18), a top guide (40) and a bottom guide (42), a valve body seat (36) and injection holes (38) and, also comprising the needle (16) extending between a first end (46) provided with a needle seat (48) and a second end forming the head (44) of the needle, the needle (16) being arranged slidably between the top guide (40) and the bottom guide (42) and movable between the closed position (PF) in which the needle seat (48) is in contact with the valve body seat ( 36), the fuel injection being prevented and, the fully open position (PO) in which the needle seat (48) is remote from the valve body seat (36), the injection being possible, the nozzle ( 14) also comprising the metal spring (58) compressed between a bearing surface (98) integral with the nozzle body (18) and a shoulder (50) of the needle; the control valve (20) comprising a valve body (22) arranged fixed on the nozzle body (18) so as to define together a control chamber (32) in which is located the head (44) of the needle, the movements of the needle (16) being a function of the pressure variations in the control chamber (32) so that in the fully open position (PO), the top (52) of the head (44) of the the needle is in contact with a wall (56) of the control chamber, said wall forming the ceiling (56) of the control chamber, the injector body (29) comprising inter alia the nozzle body (18) and the valve body (22), the needle position locator (82) for generating a variable electrical signal (S) representative of the position of the needle (16), the device (82) ) comprising the electrical insulation (Rie) of the surfaces of the needle (16), or the injector body (29), which may be in contact with each other with the exception of the needle seat (48) and the valve body seat (36), the top (52) of the needle head and the ceiling (56) of the control chamber (32). ) and the shoulder (50) for supporting the spring (58) on the needle (16); the bearing face (98) of the integral spring 25 of the nozzle body being electrically insulated.
    [0005]
    The fuel injector (10) of claim 4 wherein the top guide (40) is integrated with the nozzle body (18), the interface between the nozzle body (18) and the valve body (22) being plan, the electrical circuit (84) further comprising a planar disc-shaped member (92) arranged between the nozzle body (18) and the valve body (22), the disc (92) being provided with a opening (94) located in line with the control chamber (32), the opening (94) being slightly smaller than the control chamber (32) so that the disc (92) extends peripherally (96). ) the ceiling (56) of the control chamber, the disc (92) being formed of a metal disc provided on its two opposite faces with an electrical insulating coating (Rie), except for the periphery of the aperture located at the periphery (96) of the ceiling, surface free of insulation against which the spring (58) bears, so that in fully open position (PO) the head (44) of the needle extends through the aperture (94) and its apex (52) is in contact with the ceiling (56) of the control chamber.
    [0006]
    The injector (10) of claim 5 wherein the planar disc (92) is provided with locating apertures (120) and protuberances (122) extending perpendicularly to the plane of the disc (92) from the periphery of said disc (92). positioning apertures (120) so as to complement each other in blind positioning holes provided in the valve body (22) and in the nozzle body (18). 15
    [0007]
    Injector (10) according to any one of claims 5 or 6 wherein the electrical connection further comprises an intermediate connecting link passing through a sealed conduit (66) passing through the valve body (22), the connecting link (90) extending from an end connected to the metal disc (92) to said outer end (86).
    [0008]
    An injector (10) according to claim 4 wherein the top guide (100) is an independent piece arranged fixed between the nozzle body (18) and the valve body (22), the spring (58) being compressed between a bearing surface (50) integrated into the needle 25 and a bearing face (114) integral with the top guide (100), the electrical connection (84) comprising an annular disc (108) interposed between the spring (58) and the top guide (100), the interface between the annular disk (108) and the top guide (100) being electrically insulated (Rie), the needle (16) passing through a central opening (110) of the annular disk (108). 30
    [0009]
    9. Injector (10) according to claim 8 wherein the top guide (100) is provided with a conduit passing through it from one side, a connecting lug (112) being shaped to extend from the annular disk (108). ) into said duct.
    [0010]
    Injector (10) according to claim 8 wherein the electrical connection (84) further comprises an intermediate connection link (104) extending through a sealed and electrically insulated conduit through the valve body (22). ) to an end connected to the annular disc (108).
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    WO2016012242A1|2016-01-28|
    CN106662055B|2019-04-23|
    EP3346124B1|2020-06-17|
    EP3172429A1|2017-05-31|
    JP6516386B2|2019-05-22|
    JP2017524864A|2017-08-31|
    EP3172429B1|2018-06-06|
    FR3024183B1|2019-07-26|
    CN106662055A|2017-05-10|
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    法律状态:
    2015-07-17| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-29| PLSC| Search report ready|Effective date: 20160129 |
    2016-07-26| PLFP| Fee payment|Year of fee payment: 3 |
    2017-07-26| PLFP| Fee payment|Year of fee payment: 4 |
    2018-07-26| PLFP| Fee payment|Year of fee payment: 5 |
    2019-07-25| PLFP| Fee payment|Year of fee payment: 6 |
    2020-06-12| TP| Transmission of property|Owner name: DELPHI TECHNOLOGIES IP LIMITED, BB Effective date: 20200504 |
    2021-04-09| ST| Notification of lapse|Effective date: 20210305 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1457078|2014-07-22|
    FR1457078A|FR3024183B1|2014-07-22|2014-07-22|FUEL INJECTOR|FR1457078A| FR3024183B1|2014-07-22|2014-07-22|FUEL INJECTOR|
    EP15736450.6A| EP3172429B1|2014-07-22|2015-07-08|Fuel injector|
    PCT/EP2015/065583| WO2016012242A1|2014-07-22|2015-07-08|Fuel injector|
    JP2017503493A| JP6516386B2|2014-07-22|2015-07-08|Fuel injector|
    CN201580039708.0A| CN106662055B|2014-07-22|2015-07-08|Fuel injector|
    EP18152426.5A| EP3346124B1|2014-07-22|2015-07-08|Fuel injector|
    US15/327,687| US10502172B2|2014-07-22|2015-07-08|Fuel injector with device for detecting needle position|
    [返回顶部]