• 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 valve body 8 which acts as a closed seat together with one piezoelectric or magnetostrictive first actuator 14, a valve seat surface 6, and is actuated through a valve needle 7 by a first actuator 14. And a fuel injection valve 1 having a second piezoelectric or magnetostrictive effect actuator 15 acting on the valve needle 7 as opposed to the first actuator 14, in particular an injection valve for an internal combustion engine fuel injection device. In this case, the actuators 14 and 15 are connected to each other through bearing members 11 fixed to the fuel injection valve 1.
    公开号:KR20010053148A
    申请号:KR1020007014705
    申请日:1999-12-02
    公开日:2001-06-25
    发明作者:륄러볼프강
    申请人:클라우스 포스, 게오르그 뮐러；로베르트 보쉬 게엠베하；
    IPC主号:
    专利说明:

    Fuel injection valve and method for activating the same
    A fuel injection valve for a fuel injection valve device of an internal combustion engine is known from DE 195 38 791 A1, in which case the valve body which acts as a sealing seat together with the valve seat surface is operated by the actuator via the valve needle.
    When using a piezoelectric actuator, the basic problem is thermal expansion. Piezoelectric materials have a negative coefficient of thermal expansion unlike ordinary materials such as steel or synthetic resins, for example. Thus, the piezoelectric actuator contracts with increasing temperature while the surrounding housing expands. Due to the different coefficients of thermal expansion of the piezoelectric actuators on the one hand and the housing on the other hand, the valve stroke is temperature-dependent and, by taking appropriate measures, this difference must be compensated for.
    Niko Herakovic's dissertation "A study on the use of piezo effects for the control of pneumatic valves." Aachen University 1996, pp. 75-77, Wissenschaftverlag Aachen, ISBN 3-89653-041-0. It is known to compensate for the temperature of the first piezo actuator. In this case, two piezoelectric actuators are installed in one housing, respectively. For temperature compensation, the second piezoelectric actuator acts on a cylinder installed between the two piezoelectric actuators in the opposite direction of the first piezoelectric actuator. The stroke of the cylinder is made according to the operating stress of the first actuator. As the temperature of the two actuators increases, the thermal expansion of the two actuators is compensated for each other.
    A disadvantage of the temperature compensation method known in this paper is that the valve needle is connected to the cylinder between the two actuators via a single connection to operate the valve needle of the fuel injection valve.
    Thus, a separate part is needed to enclose at least one actuator, thereby increasing the width of the fuel injection valve. In addition, since the distance between the actuators is greater, when the heating degree of the first piezoelectric actuator is greater than the second piezoelectric actuator, the second actuator does not compensate for the thermal expansion of the first actuator. In addition, since the temperature gradient increases between the first piezoelectric actuator and the second piezoelectric actuator during long time operation, the temperature compensation is not sufficiently achieved. In this embodiment of the dissertation, the temperature of the two actuators is actively controlled using a cooling device or a heating device. In summary, this method of temperature compensation is complex and not suitable for practical applications.
    DE 195 19 192 C1 is known a fuel injection valve for an internal combustion engine fuel injection device in which the actuator operates the valve needle via a hydraulic delivery system. The delivery device has a first piston having an internal space in which the second piston operates. The second piston is connected to a valve needle actuated in the valve housing. The valve housing has a fuel filled operating room, which is bounded by a first piston and a second piston. A piezoelectric actuator is placed in contact with the first piston opposite the operating chamber of the first piston. Since the volume of the operation chamber filled with fuel must be constant, when the first piston is moved by the action of the piezoelectric actuator, the second piston operates as the first piston, and at the operation chamber side, the first piston surface and the second piston surface By appropriately adjusting the size of, the corresponding administrative change ratio is given. Temperature compensation is achieved by the space between the first and second pistons. Part of the fuel is pushed out of the operating room because the expansion with the temperature of the operating room fuel is quasi-static.
    The disadvantage of this solution is that hydraulic pressure compensation reduces the operating force of the actuator to the valve needle, which delays the response time of the valve needle and makes the fuel injection valve insensitive.
    The present invention relates to a fuel injection valve according to a higher concept of claim 1 and a fuel injection valve operating method according to claim 10.
    1 is a partial longitudinal cross-sectional view of a fuel injection valve embodiment according to the present invention.
    Figure 2 is an axial partial side view of the actuator housing of Figure 1 with two actuators and one bearing part;
    3 is a front view of FIG. 2;
    4 is a sectional view along the line IV-IV of FIG. 2;
    5 is a diagram for explaining temperature compensation.
    Figure 6 is a valve needle stroke Δh correlation diagram for the first operating energy U1 of the first actuator and the second operating energy U2 of the second actuator.
    In contrast, the fuel injection valve according to the present invention having the features of claim 1 has the advantage that the temperature compensation of the actuator is remarkably improved. In addition, the fuel injection valve according to the present invention can be used as a quick response fuel injection valve. Another advantage is that the injection process can be configured precisely, so that the injection process can be adapted to the respective operating conditions and operating conditions of the internal combustion engine, and by reducing the number of mechanical operating parts, the wear of the fuel injection valve is small. The structure is simple.
    Through the measures of claims 2 to 9 it is possible to extend the fuel injection valve of claim 1 usefully.
    The bearing part is advantageously brought into contact with the protrusion of the valve housing. By doing so, there is no need to use additional parts. At this time, the bearing part may be installed on the valve housing protrusion through the elastic deformation plate. In this case, the valve needle can be effectively centered on the sealing seat. In addition, it is possible to absorb the pressure shock acting on the valve needle momentarily, thus reducing the load on the valve needle.
    At least one actuator may advantageously be exposed to greater prestress by using bearing components, in which case the valve needle is closed on the sealing seat by forces generated by the difference in prestress when the actuator is inactive. Is maintained. This eliminates the additional pressure springs that squeeze the valve needle into the sealing seat.
    The bearing part is advantageously fastened to the valve housing using threaded parts, wherein at least one prestressing force acting on the actuator is set by the clamping torque of the threaded parts. By doing so, the pressing force of the valve needle is set constant on the sealing seat or the opening force acting on the valve needle when the actuator is in the inoperative state. In particular, it is suitable for use in conjunction with the elastic deformation plate. In this way, the ratio of the prestressed stress of the two actuators can be set.
    It is advantageous to install the actuator in an elongated actuator housing, in which case the actuator housing has a recess arranged laterally in the longitudinal direction of the actuator housing, through which the bearing part penetrates, which bearing part is in the longitudinal recess of the actuator housing. It works. The actuator housing exposes both actuators to pre-stress, which acts positively on the operating reliability of the fuel injection valve, as it prevents unfavorable tensile loads on the actuator. In addition, the actuator can be simply preassembled to the housing. The actuator housing can also be introduced through the bearing part in the valve housing into the longitudinal recess.
    It is also advantageous for the actuator housing to surround the inlet housing plate, the sealing seat side housing plate and the tubular housing wall with the longitudinal recess, wherein at least one actuator actuates the valve needle through the at least one housing plate. . In this way, the actuator housing can be compactly installed in the fuel injection valve, in which case power transmission to the valve needle is good.
    If the temperature changes, the actuator installed on the bearing part side advantageously expands toward the bearing part, and this expansion compensates for the bearing part generated when the temperature change is constant and the expansion of the bearing part of the other actuator to the bearing part. Thus, temperature compensation is particularly good.
    The fuel injection valve operating method according to the present invention having the features of claim 10 has the advantage of actively controlling the opening and closing of the valve seat in both directions without a separate component.
    The measures of claims 11 and 12 can be used to extend the method usefully.
    The valve needle can be effectively closed in a state where the second operating energy of the second actuator is blocked. Thus, the closing process is simplified since the entire energy for operating the first actuator can be used for closing the sealing sheet.
    By blocking the first operating voltage of the first actuator in a state where the second operating energy of the second actuator is cut off, the sealing sheet can be opened until the first opening cross-sectional area is reached, and the first operating voltage of the first actuator is By operating the second actuator using the electrical operating energy in the blocked state, the sealing sheet can be opened until it reaches the second open sectional area.
    In this way, the stroke of the second stage valve needle is further increased without the use of separate parts.
    The embodiment according to the invention is shown briefly in the figure and will be described in detail here.
    1 is an axial sectional view of a fuel injection valve 1 according to the present invention. The fuel injection valve 1 is in particular a so-called gasoline direct injection valve which mixes and concentrates fuel, especially gasoline, and directly injects it into an external ignition internal combustion engine. However, the fuel injection valve 1 according to the present invention can be applied to other cases.
    The fuel injection valve 1 has one valve housing 2, the inlet side is connected to the separator 3, the separator 3 has a fuel inlet 4 and is simply shown in the form of a hole in the figure. At the injection end of the fuel injection valve 1, the valve seat body 5 is provided in the valve housing 2, and the valve seat body has a valve seat surface 6. The valve needle 7 actuates the valve closure 8 which is integrally formed with the valve needle 7 in this embodiment. The valve closing body 8 is formed in a conical shape and narrowed in the injection direction, and acts as a sealing seat together with the valve seat surface 6 of the valve seat body 5. A spiral 9 is formed inside the valve housing 2, and the screw part 10 is tightened therein so that the bearing part 11 contacts the protrusion 12 of the valve housing 2 and the elastic deformation plate 13. It is fixed together in the valve housing (2). The first actuator 14 is placed on the sealing sheet surface side front surface of the bearing part 11, and the second actuator 15 is located on the inlet side front surface of the bearing part 11. The two actuators 14, 15 are then cylindrical and in the tubular housing wall 16. The front face opposite the bearing part 11 of the first actuator 14 is in contact with the sealing sheet side housing plate 17, which is connected with the tubular housing wall 16. The front face opposite to the bearing part 11 of the second actuator 15 is also in contact with the inlet housing plate 18, which is connected with the tubular housing wall 16. The tubular housing wall 16 has recesses 19, 20, and the bearing part 11 penetrates it. Combustion fuel runs from the fuel inlet 4 in the direction of the sealing sheet, for example, through the holes 21 of the bearing part 11.
    For operation of the fuel injection valve 1, the piezoelectric or self-shrink second actuator is operated with electrical operating energy, thereby expanding the second actuator 15. Since the sealing surface side front surface of the second actuator 15 is in contact with the bearing part 11, the actuator housings 16, 17, and 18 move in the direction of the separator 3, whereby the valve needle 7 is a valve seat body ( A valve seat 8 is provided which isolates the valve closure 8 from 5). The fuel is discharged from the fuel injection valve 1 to the internal combustion engine combustion chamber through the space created between the valve seat face 6 of the valve seat body 5 and the valve closing body 8. The valve body 8 of the valve needle 7 is returned through the first actuator 14, where the valve needle 7 is firmly connected to the housing plate 17.
    The front surface of the first actuator 14 in the separator plate 3 direction is supported by the bearing part 11, so that when the first actuator 14 is operated, the actuator housing 16-18 is sealed by electrical operating energy. Direction, the valve seat body 8 is pressed against the valve seat face 6 of the valve seat body 5, whereby the fuel injection valve 1 is closed.
    The valve needle 7 is likewise returned by means of a spring component, in particular a pressure spring, suitably installed inside the valve housing 2.
    In addition, the valve body 8 is returned by cutting off the electric working energy of the actuator 15. An impulse of electrical actuation energy may be applied to the actuator 14 for a quick return.
    2, 3 and 4 show the actuator housings 16, 17 and 18 with two actuators 14 and 15 and bearing parts 11. Parts already described are denoted by the same quotation marks to avoid duplicate descriptions.
    The bearing part 11 is composed of one circular portion 22 and two elongated portions 23, 24 facing 180 °. The circular part 22 of the bearing part 11 then coincides with the cross section of the two actuators 14, 15, so that the actuators 14, 15 are particularly effectively supported by the bearing part 11. Since the actuators 14, 15 are slightly expanded in the radiation direction when they contract in the axial direction, there is an interspace 25 between the actuators 14, 15 and the tubular housing wall 16, in which the actuators Radial expansion of (14, 15) is accommodated. The bearing part 11 is introduced so that the elongated part 23 of the bearing part 11 can move in the recess 20, and likewise, the elongated part 24 of the bearing part 11 also flows into the recess 19. do.
    The present invention is not limited to the above-described embodiment. Other types of bearing parts 11 actuators 14, 15 and other types of actuator housings 16 to 18 are also contemplated. In particular, the two actuators 14, 15 of the bearing part can be at least partially wrapped.
    The correlation between the valve needle 7 stroke and the 2nd actuator 15 stroke is shown in FIG. 5, and the stroke of the 2nd actuator 15 is temperature-compensated by the 1st actuator 14. As shown in FIG. The diagram longitudinal axis is the stroke Δh of the actuators 14, 15 and the valve needle 7 and the horizontal axis is the time t. In the illustrated example, when the operating energy is cut off, the first actuator 14 is used only for temperature compensation. When the operating energy of the second actuator 15 is applied at the time point t1, the second actuator 15 is expanded and maximizes at the time point t2. Since the second actuator 15 acts on the valve needle 7 without passing through the buffer component, the valve needle 7 follows the stroke of the second actuator 15 without time delay. At time t3, the operating energy of the second actuator 15 is reduced until it reaches a complete shut off state of time t4.
    The stroke of the valve needle 7 follows the stroke of the second actuator 15. As the temperature of the fuel injection valve 1 rises, the first actuator 14 acts against the expansion of the length of the second actuator 15 and thus a more effective temperature stroke is achieved. Unlike the non-compensated actuator 150 in which the actuator stroke moves by the thermal expansion fraction, the stroke characteristic curve of the actuator 15 stable to temperature does not move, and thus the stroke of the valve needle 7 is the same regardless of the temperature. Do.
    6 is a correlation diagram of the valve needle stroke Δh of the valve needle 7 with respect to the operating energy U2 of the first actuator 14 and the operating energy U1 of the second actuator 15. The vertical axis is energy U1 and U2, the valve needle stroke Δh and the horizontal axis is time t. At the time point t1, the operating energy U2 of the first actuator 14 and the operating energy U1 of the second actuator 15 are cut off, the valve needle 7 is stopped and the sealing sheet is first opened. Open to the cross-sectional area. The electrical actuation energy U2 acts on the first actuator 14 at time t1 to close the sealing sheet, at time t2 the first actuator 14 reaches its maximum stroke and the sealing sheet closes. do. If the actuator energy U2 of the first actuator 14 is constant, the sealing sheet is operated by the operation of the second actuator 15 by the electrical operating energy U1 at the time t3, and the sealing sheet is opened in the first open cross-sectional area of the time t4. It is opened until it is reached. From the time point t5, the operating energy U2 of the first actuator 14 is reduced, whereby the sealing sheet is further opened, and at the time t6 at which the operating energy U2 of the first actuator 14 is cut off. Two open cross sections are reached. At the time t7, the second actuator 15 reduces the operating energy U1, thereby reducing the open cross-sectional area of the sealing sheet and blocking the two operating energies U1, U2 of the two actuators 14, 15. At the time point t8, the first open cross-sectional area is reached again. The valve needle stroke 26 becomes larger when the operation of the fuel injection valve is compared with only one of the actuators 14, 15.
    Two stages of valve stroke can change the dispensing volume.
    权利要求:
    Claims (12)
    [1" claim-type="Currently amended] A valve body 8 which acts as a closed seat together with one piezoelectric or magnetostrictive first actuator 14, a valve seat surface 6, and is actuated through a valve needle 7 by a first actuator 14. And a fuel injection valve (1), in particular an injection valve for an internal combustion engine fuel injection device, having a second piezoelectric or magnetostrictive effect actuator (15) acting on the valve needle (7) as opposed to the first actuator (14).
    The actuator (14, 15) is a fuel injection valve, characterized in that interconnected via a bearing part (11) fixed to the fuel injection valve (1).
    [2" claim-type="Currently amended] The fuel injection valve according to claim 1, wherein the bearing part (11) has at least one fuel passage hole (21).
    [3" claim-type="Currently amended] The fuel injection valve according to claim 1 or 2, characterized in that the bearing part (11) is in contact with the projection (12) of the valve housing (2).
    [4" claim-type="Currently amended] 4. The fuel injection valve according to claim 3, wherein the bearing part (11) is in contact with the protrusion (12) of the valve housing (2) through the elastic deformation plate (13).
    [5" claim-type="Currently amended] The at least one actuator (14, 15) is exposed to stress by the bearing element (11), so that the actuators (14, 15) are in an inoperative state. The valve needle (7) is characterized in that the fuel injection valve is maintained in the closed position in the closed seat by the force caused by the pre-stress.
    [6" claim-type="Currently amended] 6. The bearing part (11) is fixed to the valve housing (2) by means of a threaded part (10), wherein the tension of the threaded part (10) is applied to the at least one actuator (14, 15). A fuel injection valve characterized in that the setting.
    [7" claim-type="Currently amended] 7. The actuator according to any one of the preceding claims, wherein the actuators (14, 15) are installed in the elongated actuator housings (16, 17, 18), wherein the actuator housings (16, 17, 18) are mounted on the actuator housing (16). 17, 18, at least one recess 19, 20 formed long in the longitudinal direction of the actuator housing 16, 17, 18, through which the bearing component 11 passes, in which case the recess A fuel injection valve characterized in that the bearing part (11) of (19, 20) operates in the longitudinal direction of the actuator housing (16, 17, 18).
    [8" claim-type="Currently amended] The tubular shape according to claim 7, wherein the actuator housing (16, 17, 18) is tubular with an inlet housing plate (18), a sealing seat side housing plate (17) and longitudinally formed recesses (19, 20). A fuel injection valve, characterized by surrounding the housing wall (16), wherein at least one actuator (14) operates the valve needle (7) via at least one housing plate (17).
    [9" claim-type="Currently amended] 9. The at least one actuator (15) installed on one side of the bearing component (11) expands in the direction of the bearing component (11) in accordance with any one of the preceding claims, wherein the expansion is a change in temperature. The fuel injection valve, characterized in that to compensate for the expansion in the bearing part (11) direction appearing on at least one actuator (14) installed on the other side of the bearing part (11) when is equal.
    [10" claim-type="Currently amended] A valve body 8 which acts as a closed seat together with one piezoelectric or magnetostrictive first actuator 14, a valve seat surface 6, and is actuated through a valve needle 7 by a first actuator 14. And a fuel injection valve 1 having a second piezoelectric or magnetostrictive effect actuator 15 acting on the valve needle 7 as opposed to the first actuator 14, in particular the fuel injection valve for an internal combustion engine, Order, i.e.
    The first actuator 14 is operated by the first operating energy U2 to close the sealing sheet.
    The first operating energy U2 of the first actuator 14 is reduced, and also
    And the sealing sheet is opened by operating the second actuator (15) by the second operating energy (U1).
    [11" claim-type="Currently amended] Method according to claim 10, characterized in that the sealing sheet is closed when the second electrical operating energy (U1) of the second actuator (15) is interrupted.
    [12" claim-type="Currently amended] The method according to claim 10 or 11, wherein when the second operating energy (U1) of the second actuator (15) is cut off, the first operating energy (U2) of the first actuator (14) is cut off to thereby open the first open cross-sectional area. The valve seat is opened until this, and when the first operating energy U2 of the first actuator 14 is blocked, the second opening 15 is opened by the operation of the second actuator 15 by the second electrical operating energy U1. The sealing sheet is opened until a cross-sectional area is reached, wherein the second open cross-sectional area is larger, in particular two times larger than the first open cross-sectional area.
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    同族专利:
    公开号 | 公开日
    EP1092089A1|2001-04-18|
    WO2000065224A1|2000-11-02|
    JP2002543329A|2002-12-17|
    DE19918976A1|2000-11-02|
    US6749126B1|2004-06-15|
    JP4469507B2|2010-05-26|
    EP1092089B1|2004-11-03|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1999-04-27|Priority to DE19918976.5
    1999-04-27|Priority to DE19918976A
    1999-12-02|Application filed by 클라우스 포스, 게오르그 뮐러, 로베르트 보쉬 게엠베하
    1999-12-02|Priority to PCT/DE1999/003867
    2001-06-25|Publication of KR20010053148A
    优先权:
    申请号 | 申请日 | 专利标题
    DE19918976.5|1999-04-27|
    DE19918976A|DE19918976A1|1999-04-27|1999-04-27|Fuel injector and method for actuating it|
    PCT/DE1999/003867|WO2000065224A1|1999-04-27|1999-12-02|Fuel injection valve and method for activating the same|
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