• 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:
    The fuel injection valve 1 for the fuel injection system of the internal combustion engine comprises a valve needle 3, a valve closing body 4 which is in interaction with the valve needle and a plurality of injection holes 7 downstream of the flow direction of the sealing seat; The valve closing body interacts with the valve seat face 6 arranged in the valve seat body 5 as a sealing seat. The injection of fuel from the at least one injection port 7 can be at least temporarily interrupted and the fuel injection from each injection port 7 is each via local evaporation of the fuel by one local heating element 44. Blocked, the heating element is arranged on the face 43, which restricts the flow path, upstream of the flow direction of each injection port 7.
    公开号:KR20020072297A
    申请号:KR1020027009791
    申请日:2001-11-30
    公开日:2002-09-14
    发明作者:휘벨미하엘
    申请人:로베르트 보쉬 게엠베하；
    IPC主号:
    专利说明:

    Fuel injection valve
    [2] Fuel injection valves with multiple injection holes are known. The injection valve comprises a plurality of injection holes, mainly implemented as bores, in a flow direction downstream of the sealing sheet consisting of a valve needle and a valve seat surface, and when the valve needle is lifted, fuel is injected through the injection holes.
    [3] From DE 32 28 079 A1 a multi-hole fuel injection valve is known, in which the number of openings opened during the injection process changes. By using the valve hole needle and the second valve needle guided in the needle, two sealing sheets are formed which act independently of each other. The opening of the fuel injection valve is controlled through the applied fuel pressure. The valve hole needle is first lifted from its sealing seat and opens the portion of the injection port arranged on the first hole circle at the downstream end in the flow direction of the fuel injection valve formed conical. After the injection of the pre-injection amount, the second valve needle is lifted and opens further injection holes arranged on the second hole circle having a smaller diameter than the first hole circle. Just before the end of the injection process, the fuel pressure remains constant and both valve needles are lifted from their respective sealing seats. At the end of the injection process, the fuel pressure drops and both valve needles return back to their initial positions through spring force. The hollow needle first closes part of the injection port before the inner valve needle follows another pressure drop.
    [4] Another fuel injection valve with two stages of injection characteristics is known from DE 31 20 044 C2. Similar to the fuel injection valve presented above, the fuel pressure is used here as an opening force. The fuel injection valve includes a first valve needle implemented as a hollow needle with a blind hole closed downstream in the flow direction, the second valve needle being guided inside the hole. At the start of the injection process, the hollow needle opens the fuel injection valve so that the needle moves downward in the flow direction through the applied fuel pressure and the fueled snap ring groove is moved through the supply surface of the injection port. At the flow direction downstream end of the hollow needle, a sealing sheet is formed in the blind hole, and is arranged in the flow direction downstream of the injection port. When the hollow needle moves in the downstream direction of the flow direction, the second valve needle is supported by a spring in a sealed position on the sealing sheet until another movement is prevented through the mechanical stop. The hollow needle can also be moved downstream in the flow direction and the second valve needle is lifted from its sealing seat to open the second group of jets. The closing process takes place in the reverse order as the fuel pressure drops.
    [5] Both fuel injection valves presented have the disadvantage that they only include a fixed set opening and closing profile. This makes it not possible to vary the parameters of the operating state of the internal combustion engine. At the beginning and the end of the injection process, the influence of the injection shape can only be compromised, since separate settings of both processes are not possible for systems operating mechanically or hydrodynamically.
    [6] The total hydrodynamic construction is also a disadvantage. This requires a large number of parts and their interaction requires processing with high accuracy. As a result, manufacturing costs and reject rates are high. In addition to the high cost of manufacturing the individual parts, many steps are also carried out when assembling the fuel injection valve, so the cost and error rate are again high.
    [7] Inspection of the function of the fuel injection valve is difficult because the valve is only controlled during operation of the fuel injection valve. The cost for hydraulic testing is very high and incurs additional costs.
    [8] The mechanical cost of operation is also a disadvantage. The wear of many moving parts is large, and the highly accelerated mass is a disadvantage in response characteristics and speed of regulation. If the entire valve group is replaced through the abrasion, a higher cost is again added to the consumer.
    [1] The present invention relates to a fuel injection valve according to the preamble of the independent claim.
    [18] 1 is a schematic partial view of an embodiment of a fuel injection valve according to the present invention;
    [19] 2 is a schematic partial view of section II of FIG. 1 of an embodiment of a fuel injection valve according to the present invention;
    [20] 3 is a schematic cross-sectional diagram cut along the line III-III of FIG. 2;
    [21] 4 is a schematic cross sectional view of section IV of FIG. 2 of a fuel injection valve according to the invention when the heating element is not excited;
    [22] 5 is a schematic cross-sectional view of section IV of FIG. 2 of a fuel injection valve according to the invention when the heating element is excited;
    [9] In contrast, the fuel injection valve according to the invention having the features of the independent claims can be used variably. The connection and disconnection of individual nozzles or groups of nozzles is made via electrical heating elements. Coupling to fuel pressure in the fuel injection valve is not necessary. During the entire spraying process, the number of open nozzles can be affected. This allows different properties to be used for the start and end of the injection. The use of an electrical system enables control by a characteristic field that switches the operating state of the internal combustion engine corresponding to the optimum injection structure.
    [10] Another advantage is the reduction of moving parts. Since only valve needles are needed, the coaxially sealed sheet eliminates costly processing. Similarly, the simple configuration of the valve needle itself also reduces costs.
    [11] Due to the omission of the moving parts, the moving mass is also clearly reduced. The opening and closing of the nozzle is made electrically. Thus, the response time of the system is significantly reduced, and a high switching frequency can be used to enable multiple openings and closings of one or multiple injection holes during the injection process.
    [12] The measures described in the dependent claims enable another preferred embodiment of the present fuel injection valve.
    [13] Control of multiple electrical circuits to excite the heating element, unlike mechanical methods, enables two or more spraying shapes. The additional cost for such a system is limited to additional lines for contacting the heating elements.
    [14] For quality protection, the use of electrical systems is equally positive. The functional test of the switching function of the fuel injection valve can now be performed electrically by connecting the test plug to the fuel injection valve. The method proved to be practical in practice because of the low test time and high test accuracy.
    [15] The use of a supply disk is also preferred, on which a heating element is provided. In this way, modifications are easily possible. The use of structurally identical supply disks with different electrical properties data is not only associated with low manufacturing costs but also with the simple switching of manufacturing.
    [16] In order to shorten the switching time, it is desirable to form heating elements by thin film technology. This reduces the mass to be heated which reduces the switching time, thus increasing the possible switching frequency.
    [17] Embodiments are illustrated in the drawings and described in more detail in the detailed description that follows.
    [23] In order to better understand the present invention, before the fuel injection valve 1 according to the present invention is described in detail by FIGS. 2 to 5, the fuel injection valve 1 according to the present invention is first shown in FIG. The entire diagram of the components should be briefly described.
    [24] The fuel injection valve 1 is implemented in the form of a fuel injection valve 1 for a fuel injection system of a mixed condensation, spark ignition internal combustion engine. The fuel injection valve 1 is particularly suitable for injecting fuel directly into the combustion chamber of an internal combustion engine, not shown.
    [25] The fuel injection valve 1 comprises a nozzle body 2 in which a valve needle 3 is arranged. The valve needle 3 is connected in action with the valve closing body 4 which interacts as a sealing seat with the valve seat surface 6 arranged on the valve seat body 5. The fuel injection valve 1 is treated with an electromagnetically operated fuel injection valve 1, in which a plurality of injection holes 7 are used. The nozzle body 2 is sealed against the outer pole 9 of the magnetic coil 10 via a seal 8. The magnetic coil 10 is encapsulated in the coil housing 11 and wound on the coil carrier 12 in contact with the inner electrode 13 of the magnetic coil 10. The inner pole 13 and the outer pole 9 are separated from each other via the gap 26 and supported on the connecting part 29. The magnetic coil 10 is excited by an electrical current that can be supplied via line 19 and through electrical plug contact 17. The plug contact 17 is surrounded by a plastic sheath 18, which can be injection molded into the inner electrode 13.
    [26] The valve needle 3 is guided in a valve needle guide 14 embodied in a disc shape. Another injection side needle guide 49 is also provided. The valve needle guide 14 is embodied in pairs with an adjustment disk 15 used to adjust the valve needle stroke. The armature 20 is located on the upstream side of the adjustment disk 15 in the flow direction. The armature is connected non-positively with the valve needle 3 via the flange 21 and the valve needle is connected with the flange 21 via the weld seam 22. On the flange 21, a rebound spring 23, which comes into an initial stress state, is supported through the sleeve 24 press-fitted into the inner electrode 13 in this form of the fuel injection valve 1.
    [27] Fuel channels 30 and 30a extend in the valve needle guide 14 and the armature 20. The filter element 25 is arranged in the central fuel supply 16. The fuel injection valve 1 is sealed against a fuel line, not shown, through the seal 28.
    [28] In the stationary state of the fuel injection valve 1, the armature 20 acts from the reaction spring 23 toward its stroke direction through the flange 21 of the valve needle 3, so that the valve closing body 4 is closed. It is held in the sealed position of the seat surface 6. Upon excitation of the magnetic coil 10, the magnetic coil constitutes a magnetic field that moves the armature 20 in the stroke direction against the spring force of the recoil spring 23, and the stroke includes the inner pole 13 and the armature 20. It is preset via the working gap 27 in the stop position between. The armature 20 likewise follows the flange 21 welded with the valve needle 2 and thereby the valve needle 3 in the stroke direction. The valve closing body 4, in action with the valve needle 3, is lifted from the valve seat surface 6 and the fuel passes through the valve closing body 4 to the through hole 33 of the valve seat body 5. And continues and flows through the recesses 34 and 35 arranged in the supply disk 32 to the injection port 7.
    [29] When the coil current is interrupted, the armature 20 descends from the inner pole 13 after the magnetic field is sufficiently reduced by the pressure of the recoil spring 23 on the flange 21, so that the valve needle 3 is in the stroke direction. To move against. The valve closing body 4 is thus supported on the valve seat surface 6, so that the fuel injection valve 1 is closed.
    [30] 2 shows a section of a fuel injection valve 1 according to the invention. A through hole 33 is formed in the valve seat body 5 on the downstream side in the flow direction of the sealing sheet, and the fuel to be injected when the fuel injection valve 1 is opened flows through the through hole to the supply disk 32, The supply disk is formed with flow channels through recesses 34 and 35 and fuel can continue to flow through the flow channel to the inlet 7. The supply disk 32 is fixed relative to the valve seat body 5 and the injection hole disk 31 in its position via a positive connection. The injection hole disk 31 is connected with the valve seat body 5 via a welding connection 36, for example. A plurality of injection holes 7 are arranged in the injection hole disk 31, for example one injection hole 7 is located on the central axis 37 of the fuel injection valve 1 and the other injection holes 7 are It is distributed on two hole circles concentric with the central axis 37 of the fuel injection valve 1.
    [31] The supply disk 32 is preferably implemented as a flat disk made from a semiconductor substrate. In particular, the use of a silicon substrate (silicon wafer) can be considered. The radial recess of the supply disk 32 is smaller than the radial recess of the injection hole disk 31. In the flow direction upstream face 38 of the supply disk 32 a recess 34 is formed which is realized in the form of a segment of an annular ring and which extends concentrically with respect to the hole circle of the injection port 7. One annular ring is assigned to each hole circle, and the width and diameter of the annular ring are measured so that there is no overlap with the injection port 7 in the radial direction. The depth of the recess 34 is lower than the thickness of the supply disk 32 and at the thickness of the supply disk 32, the recess of the downstream side 39 of the flow direction downstream of the supply disk 32, which will be described below ( Subtract 35).
    [32] On the downstream side 39 of the flow direction, another recess 35, which is realized in the form of an annular ring, is arranged in the supply disk 32. The number of recesses 35 in the form of an annular ring is equal to the number of hole circles, on which injection holes 7 are arranged. The width of the flow direction downstream recess 35 is larger than the width of the flow direction upstream recess 34, the diameter of which allows the inlet opening of the injection port 7 to pass through the recess 35 in the form of an annular ring. Is measured. Since the annular ring segment of the flow direction upstream recess 34 and the annular ring of the flow direction downstream recess 35 overlap in the radial direction, the through hole 33 and the injection hole 7 of the valve seat body 5. There is a connection through which fuel can flow.
    [33] There is a through hole 40 in the supply disk 32 upstream of the flow direction of the injection hole 7 arranged in the center. For the embodiment of the fuel injection valve 1 with the injection hole 7 in the hole circle to be connected and disconnected, a similar through hole is likewise provided in the supply disk 32 upstream of the flow direction of the injection hole 7 which will not be connected. Can be.
    [34] The injection hole disk 31 comprises a recess 41 in the center, in which the feed disk 32 can be inserted and its depth corresponds to the thickness of the feed disk 32. It is likewise contemplated that the supply disk 32 is configured in a recess on the side of the valve seat body 5 for positively engaging fastening. The injection holes 7 of the injection hole disc 31 can be inclined with respect to the central axis 37 of the fuel injection valve 1, and all the injection holes 7 arranged on one hole circle are inclined equally. This is preferred. Since the opening angle of the conical sheath in which the central axis 42 of the injection hole 7 is located is the largest for the largest hole circle, the injected fuel yarns 48 are not hindered from their mutual expansion.
    [35] Since the width and the radial expansion of the recesses 34 and 35 are different in the direction of the central axis 42 of the injection hole 7 extending upward in the flow direction, the supply disk 32 is provided with, for example, the center of the injection hole 7. A face 43 is formed which faces almost perpendicular to the axis 42. The injection hole disk 31 covers the recess 35 in the flow direction downstream of the supply disk 32, so that the fuel flowing through the supply disk 32 is strongly redirected.
    [36] 3 shows the construction of the local heating element 44 on the supply disk 32 in a plan view. The local heating element 44 is formed on the face 43 on the upstream side in the flow direction of each injection port 7 to which it can be connected, so it faces in the downstream direction. In the embodiment shown, all local heating elements 44 belonging to each injection hole 7 arranged on one hole circle are each integrated into one electrical circuit. The electrical supply lines 45a and 45b extend radially outward on the flow direction upstream face 38 of the supply disk 32 in the region between the recesses 34. Contact of the electrical supply lines 45a, 45b, not shown in another path inside the fuel injection valve 1, may be made for example in the electrical plug contact 17. The grouping of the local heating elements 44 allows the electrical supply lines 45a and 45b to be moved on the supply disk 32 without intersection. The local heating element 44 is preferably formed on the supply disk 32 by thin film technology.
    [37] 4 and 5 show an enlarged detail part IV of FIG. 2 for a better understanding of how the fuel injection valve 1 operates according to the invention. If the local heating element 44 is not excited, the fuel flowing into the flow direction upstream recess 34 of the supply disk 32 when the fuel injection valve 1 is opened is deflected and thus in the local heating element 44. It flows along the injection hole 7 and is injected.
    [38] If one injection hole 7 is to be blocked, the local heating element 44 is excited by an electric current. The heating element 44 is heated until the fuel evaporates locally at the upper surface 46 downstream of the flow direction, as shown in FIG. As the amount of fuel evaporated increases, the fuel vapor bubbles 47 expand. The expansion is almost spherical from the local heating element 44. If the fuel vapor bubble 47 is large enough, the bubble blocks the fuel from entering the injection hole 7 of the injection hole disk 31.
    [39] At the same time, the residual fuel present in the inlet 7 is sometimes exited from the inlet 7 by an expanded fuel vapor bubble 47. After the remaining fuel has exited the injection port 7, no more fuel is discharged from the injection port 7.
    [40] The injection shape of the fuel injection valve 1 is obtained as the sum of the fuel spinning 48 injected from the individual injection ports 7. As a result, blocking of the individual injection holes 7 or groups of injection holes 7 changes the overall injection shape. The individual spinning properties are not affected by the connection or disconnection of the other injection holes 7.
    权利要求:
    Claims (8)
    [1" claim-type="Currently amended] Valve needle 3, the valve needle body 4 which is connected to the valve needle and interacts as a sealing seat with the valve seat surface 6 arranged on the valve seat body 5 and the flow direction downstream of the sealing seat A fuel injection valve for a fuel injection system of an internal combustion engine having a plurality of injection holes (7) on the side, wherein fuel injection from at least one injection hole (7) can be at least temporarily blocked.
    In order to block fuel injection from each one of the injection holes 7 via local evaporation of the fuel, one local heating element each on the face 43 restricting the flow path upstream of the flow direction of each injection hole 7 ( Fuel injection valve (44).
    [2" claim-type="Currently amended] A fuel injection valve according to claim 1, characterized in that the plurality of local heating elements (44) are integrated into one group which can be excited by a common circuit.
    [3" claim-type="Currently amended] 2. The fuel injection valve according to claim 1, wherein the plurality of local heating elements (44) are integrated into a plurality of groups, each of which can be excited separately from each other by one circuit.
    [4" claim-type="Currently amended] 4. The local heating element 44 according to any one of the preceding claims, wherein the local heating element 44 is provided on the supply disk 32 upstream of the flow direction of the injection hole disk 31 including the injection hole 7. A fuel injection valve characterized in that.
    [5" claim-type="Currently amended] 5. Fuel injection valve (1) according to claim 4, characterized in that the supply disk (32) is fixed in the fuel injection valve (1) via positive locking.
    [6" claim-type="Currently amended] 6. The fuel injection valve according to claim 1, wherein the supply disk is made of semiconductor material. 7.
    [7" claim-type="Currently amended] 7. The fuel injection valve according to claim 6, wherein the supply disk (32) is a silicon substrate.
    [8" claim-type="Currently amended] 8. Fuel injection valve according to claim 6 or 7, characterized in that the local heating element (44) is provided on the supply disk (32) by thin film technology.
    类似技术:
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    同族专利:
    公开号 | 公开日
    US20030121999A1|2003-07-03|
    DE10060289A1|2002-06-06|
    EP1342004A1|2003-09-10|
    WO2002046600A1|2002-06-13|
    JP2004515688A|2004-05-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2000-12-05|Priority to DE2000160289
    2000-12-05|Priority to DE10060289.4
    2001-11-30|Application filed by 로베르트 보쉬 게엠베하
    2001-11-30|Priority to PCT/DE2001/004508
    2002-09-14|Publication of KR20020072297A
    优先权:
    申请号 | 申请日 | 专利标题
    DE2000160289|DE10060289A1|2000-12-05|2000-12-05|Fuel injector|
    DE10060289.4|2000-12-05|
    PCT/DE2001/004508|WO2002046600A1|2000-12-05|2001-11-30|Fuel injection valve|
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