Control valve matching part for electronic control fuel injector

Abstract

The invention discloses a control valve matching part for an electronic control fuel injector, and relates to the technical field of control valve matching parts, the control valve matching part comprises a fuel injector shell, an electromagnetic connector is arranged on the fuel injector shell, an electromagnetic group outer cavity and a valve group inner cavity are formed in the fuel injector shell, and an electromagnetic coil is arranged in the electromagnetic group outer cavity formed in the fuel injector shell; the electromagnetic connector is arranged at the upper end of the oil injector shell, the electromagnetic connector is arranged at the lower end of the oil injector shell, the electromagnetic connector is arranged at the lower end of the electromagnetic connector, the electromagnetic coil is electrically connected with the electromagnetic connector, and the armature is arranged at the lower end of the electromagnetic coil. The magnetic field cannot be attenuated by diesel oil in the working process, so that the magnetic field generated by the electromagnetic coil can act on the armature in a state closer to the theoretical strength, the armature can respond to the magnetic field change more sensitively, the response speed of the oil injector is increased, and fuel oil injection is more accurate and timely.

Description

Technical Field

[0001] The invention relates to the technical field of control valve pairs, and in particular to a control valve pair for an electronically controlled fuel injector. Background Art

[0002] High-pressure common rail electronic fuel injector is a key component of diesel engine electronic fuel injection system. It is mainly composed of solenoid valve, control piston, needle valve, etc. It controls the solenoid valve by receiving ECU signal, and uses the oil control cavity and throttle hole to accurately adjust the fuel pressure, thereby accurately controlling the injection amount, injection time and injection rate. It has the characteristics of precise control, flexible adjustment, high-pressure injection and rapid response, which can effectively improve the engine power, economy and emission performance;

[0003] The current control valve components for electronic fuel injectors are found to have at least the following technical problems:

[0004] First, in the prior art, the magnetic field can penetrate diesel, but diesel is not a vacuum after all, and will still have a certain attenuation effect on the magnetic field. The magnetic field strength gradually weakens with the increase of the penetration distance. When the diesel layer is thicker or the diesel contains certain impurities (such as metal particles, etc.), the attenuation of the magnetic field strength will be more obvious. The magnetic field strength will be weakened to a certain extent due to the presence of diesel, resulting in a smaller attraction of the armature and a longer response time.

[0005] Second, in the prior art, during long-term use, the electromagnetic coil may experience electromagnetic force attenuation due to hysteresis loss and eddy current loss of the iron core. The attenuation of the electromagnetic force will cause the valve core to be unable to accurately open or close according to the instructions of the electronic control unit, resulting in deviations in the fuel injection timing and injection amount. Summary of the invention

[0006] Technical issues solved

[0007] In view of the deficiencies in the prior art, the present invention provides a control valve pair for an electronically controlled fuel injector to solve the above-mentioned technical problems.

[0008] Technical Solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A control valve pair for an electronically controlled fuel injector comprises a fuel injector housing, an electromagnetic connector is arranged on the fuel injector housing, an electromagnetic group outer cavity and a valve group inner cavity are provided inside the fuel injector housing, an electromagnetic coil is provided in the electromagnetic group outer cavity provided in the fuel injector housing, the electromagnetic coil is electrically connected to the electromagnetic connector, an armature is provided at the lower end of the electromagnetic coil, a control valve assembly is provided in the valve group inner cavity provided in the fuel injector housing, the control valve assembly comprises a valve stem, a valve core is provided at the lower end of the valve body, two sealing rings are provided on the circumferential surfaces of the valve stem and the valve core, and the two sealing rings are provided. The sealing ring is fitted on the inner wall of the injector housing, the lower end of the valve core is fitted with the oil outlet passage opened by the valve seat, the main oil passage opened in the injector housing is located outside the outer cavity of the electromagnetic group, a valve seat is provided inside the injector housing, an oil outlet passage is penetrated through the valve seat, the oil outlet passage opened on the valve seat is connected with the main oil passage, two special oil passages are provided on the inner wall of the main oil passage opened in the injector housing, and the two special oil passages are both connected with the cavity where the valve stem and the valve core slide in the injector housing.

[0011] Preferably: a return spring is fixedly mounted on the valve stem, the top of the return spring is fixedly connected to the injector housing, the armature is fixedly mounted on the circumferential surface of the valve stem, an oil inlet passage is opened at the upper end of the injector housing, and the main body oil passage is connected to the oil inlet passage opened in the injector housing.

[0012] Preferably: an adjusting rod is fixedly mounted on the upper end of the valve core, the adjusting rod is slidably mounted in the valve stem, a sliding groove is provided in the adjusting rod, an adjusting screw is vertically slidably mounted in the sliding groove provided in the adjusting rod, and a limiting ring is fixedly mounted on the lower end of the adjusting screw.

[0013] Preferably: the circumferential surfaces of the limit ring and the adjusting screw are sleeved with extrusion blocks, two positioning plates are installed in the sliding groove of the adjusting rod for transverse sliding, the extrusion block is located between the two positioning plates, and the two extrusion blocks are both fitted on the inner wall of the valve stem.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention arranges the main oil channel opened in the injector housing on the outside of the electromagnetic coil and the armature. Since the main oil channel through which the diesel passes is no longer located between the electromagnetic coil and the armature, the magnetic field will not be attenuated by the diesel during operation. In this way, the magnetic field generated by the electromagnetic coil can act on the armature at a state closer to the theoretical strength, so that the armature can respond to the change of the magnetic field more sensitively, thereby improving the response speed of the injector and making the fuel injection more accurate and timely.

[0016] Second: The main oil channel opened in the injector housing of the present invention is arranged on the outside of the electromagnetic coil and the armature, which avoids the interference of diesel and its impurities on the magnetic field and helps to maintain the stability of the magnetic field. The new channel design can make the magnetic field work in a relatively stable environment, ensuring that each time the electromagnetic coil is energized, the armature can move in a preset manner, reducing problems such as uneven injection or injection timing deviation caused by unstable magnetic field.

[0017] Third: The present invention opens a special oil channel in the main oil channel opened in the injector housing, and then connects it with the cavity where the valve stem and valve core move. When the electromagnetic force of the electromagnetic coil decays due to long-term use and other reasons, and the valve stem and valve core cannot be completely opened, the diesel oil pressure through the special oil channel can push the valve stem upward to make up for the lack of electromagnetic force, so that the valve stem and valve core can still reach the proper opening degree, maintain the normal fuel injection function of the injector, and avoid abnormal injection or even injector failure due to electromagnetic force decay.

[0018] Fourth: The present invention can achieve the function of assisting opening with the help of the force of oil pressure, which to a certain extent reduces the workload of related electromagnetic control components such as the electromagnetic coil and the armature. The electromagnetic components do not need to always drive the valve stem and the valve core at their maximum capacity, thereby reducing the risk of accelerated wear and damage of these components due to excessive use and high-load operation, helping to extend the service life of the entire injector, reduce the frequency of repairing and replacing the injector, and reduce the cost of use.

[0019] 5. The present invention provides a special oil passage, and the diesel enters the cavity where the valve stem slides in the injector housing through the special oil passage, so that a thin oil film can be formed on the contact surface of the two. This oil film can effectively reduce the direct metal friction between the valve stem and the injector housing, and avoid surface scratches and wear caused by friction. Especially for the valve stem that moves frequently for a long time, this lubrication effect can significantly extend the service life, reduce the risk of injector failure due to component wear, and thus reduce the cost of repair and replacement of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 It is a structural diagram of the whole invention;

[0022] Figure 2 It is a structural diagram of the fuel injector housing of the present invention;

[0023] Figure 3 is a structural diagram of the valve seat of the present invention;

[0024] Figure 4 It is a structural diagram of the valve stem of the present invention;

[0025] Figure 5 It is a structural diagram of the valve core of the present invention;

[0026] Figure 6 It is a structural diagram of the adjusting rod of the present invention;

[0027] Figure 7 is a structural diagram of the sealing ring of the present invention;

[0028] Figure 8 For the present invention Figure 7 A magnified view of the structure at A.

[0029] Legend: 11. Adjusting rod; 12. Adjusting screw; 13. Extrusion block; 14. Positioning plate; 15. Limiting ring; 16. Sliding groove; 17. Valve core; 18. Sealing ring; 21. Injector housing; 22. Main oil channel; 23. Special oil channel; 24. Valve seat; 25. Oil outlet channel; 27. Oil inlet channel; 28. Electromagnetic connector; 31. Electromagnetic coil; 33. Armature; 34. Valve stem; 35. Return spring. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0031] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, in view of the problems existing in the prior art, the present invention provides a control valve pair for an electronically controlled fuel injector, wherein the electronically controlled fuel injector is an electronically controlled high-pressure common rail fuel injector, comprising a fuel injector housing 21, on which an electromagnetic connector 28 is provided, and inside the fuel injector housing 21 there are an electromagnetic group outer cavity and a valve group inner cavity, the electromagnetic group outer cavity provided in the fuel injector housing 21 is provided with an electromagnetic coil 31, the electromagnetic coil 31 is electrically connected to the electromagnetic connector 28, an armature 33 is provided at the lower end of the electromagnetic coil 31, a control valve assembly is provided in the valve group inner cavity provided in the fuel injector housing 21, and the control valve assembly comprises a valve stem 34, a valve core 17 is provided at the lower end of the valve stem 34, and two sealing rings 18 are sleeved on the circumferential surfaces of the valve stem 34 and the valve core 17, and the two sealing rings 18 The valve core 17 and the valve seat 24 are both fitted on the inner wall of the injector housing 21. The lower end of the valve core 17 fits with the oil outlet passage 25 opened by the valve seat 24. The main oil passage 22 opened in the injector housing 21 is located on the outside of the outer cavity of the electromagnetic group. A valve seat 24 is provided inside the injector housing 21. An oil outlet passage 25 is provided through the valve seat 24. The oil outlet passage 25 opened by the valve seat 24 is connected with the main oil passage 22. Two special oil passages 23 are provided on the inner wall of the main oil passage 22 opened in the injector housing 21. The two special oil passages 23 are connected with the valve stem 34 and the cavity where the valve core 17 slides in the injector housing 21. When the injector and the electromagnetic control valve assembly therein are in use, diesel is discharged from the injector housing 21. The fuel oil enters the oil inlet passage 27, then enters the main oil passage 22 opened in the fuel injector housing 21, and then enters the intersection of the oil outlet passage 25 opened by the valve core 17 and the valve seat 24, and is blocked by the valve core 17. A part of the diesel oil will pass through the two special oil passages 23 opened in the fuel injector housing 21, enter between the valve core 17 and the valve stem 34, and the upper and lower ends of the cavity entered are sealed by the sealing ring 18, and there will be no oil leakage. When the fuel injector is spraying fuel, the electromagnetic coil 31 is powered by the electromagnetic connector 28, so that the electromagnetic coil 31 generates magnetic force to adsorb the armature 33. At this time, the armature 33 drives the valve stem 34 to move upward, and the valve stem 34 drives the valve core 17 to move upward. The upward movement of the valve core 17 will contact with the valve seat 24. The oil outlet passage 25 opened by the valve core 17 and the valve seat 24 is separated. At this time, the diesel at the intersection of the oil outlet passage 25 opened by the valve core 17 and the valve seat 24 will be sprayed out from the valve seat 24 opened by the valve seat 24, and then atomized through the subsequent needle valve and the needle valve body. The present invention arranges the main oil passage 22 opened by the injector housing 21 on the outside of the electromagnetic coil 31 and the armature 33. Since the main oil passage 22 through which the diesel passes is no longer located between the electromagnetic coil 31 and the armature 33, the magnetic field will not be attenuated by the diesel during operation. In this way, the magnetic field generated by the electromagnetic coil 31 can act on the armature 33 at a state closer to the theoretical strength, so that the armature 33 can respond to the change of the magnetic field more sensitively, thereby improving the response speed of the injector and making the fuel injection more accurate and timely.The main oil channel 22 of the fuel injector housing 21 of the present invention is arranged outside the electromagnetic coil 31 and the armature 33, which avoids the interference of diesel and its impurities on the magnetic field and helps to maintain the stability of the magnetic field. The new channel design can make the magnetic field work in a relatively stable environment, ensuring that each time the electromagnetic coil 31 is energized, the armature 33 can move in a preset manner, reducing problems such as uneven fuel injection or fuel injection timing deviation caused by unstable magnetic field.

[0032] A return spring 35 is fixedly installed on the valve stem 34, and the top of the return spring 35 is fixedly connected to the injector housing 21. The armature 33 is fixedly installed on the circumferential surface of the valve stem 34. An oil inlet passage 27 is opened at the upper end of the injector housing 21. The main oil passage 22 is connected with the oil inlet passage 27 opened in the injector housing 21. When the diesel flows out from the oil outlet passage 25 opened in the valve seat 24, the diesel flowing to the valve core 17 and the valve stem 34 through the special oil passage 23 will still have a certain pressure. This oil pressure will generate a certain thrust on the bottom of the valve stem 34, so that the valve stem 34 and the valve core 17 can be more easily When the electromagnetic coil 31 disappears, the elastic force of the return spring 35 will move the valve stem 34 and the valve core 17 down to their original positions. At this time, since the oil pressure is less than the elastic force of the return spring 35, the diesel between the valve stem 34 and the valve core 17 will return to the special oil passage 23. The present invention opens a special oil passage 23 in the main oil passage 22 opened in the injector housing 21, and then connects it with the cavity where the valve stem 34 and the valve core 17 move. When the electromagnetic force of the electromagnetic coil 31 decays due to long-term use and the like, it is impossible to ensure that the valve stem 34 and the valve core 17 are completely opened. The diesel oil pressure through the special oil channel 23 pushes the valve stem 34 upward to make up for the lack of electromagnetic force, so that the valve stem 34 and the valve core 17 can still reach the proper opening degree, maintain the normal fuel injection function of the injector, and avoid abnormal injection or even injector failure due to the attenuation of electromagnetic force. The present invention can use the force of oil pressure to achieve the effect of auxiliary opening, which to a certain extent reduces the workload of related electromagnetic control components such as the electromagnetic coil 31 and the armature 33. The electromagnetic components do not need to always drive the valve stem 34 and the valve core 17 at their maximum capacity, thereby reducing the risk of accelerated wear and damage of these components due to excessive use and high-load operation, which helps to extend the service life of the entire injector, reduce the frequency of repairing and replacing the injector, and reduce the cost of use.

[0033] The upper end of the valve core 17 is fixedly installed with an adjusting rod 11, which is slidably installed in the valve stem 34. A sliding groove 16 is provided in the adjusting rod 11, and an adjusting screw 12 is vertically slidably installed in the sliding groove 16 provided in the adjusting rod 11. A limiting ring 15 is fixedly installed at the lower end of the adjusting screw 12. Since the diesel moves up and down between the valve stem 34 and the valve core 17 back and forth, the diesel will cover a layer of film on the inner wall of the injector housing 21. This film will not be affected by the sealing ring 18, so the film generated by the diesel will have a certain lubricating effect on the valve stem 34 and the valve core 17, so that it is in the injector housing. The up and down movement inside the body 21 can reduce wear. The present invention provides a special oil passage 23, and the diesel enters the cavity where the valve stem 34 slides in the injector housing 21 from the special oil passage 23, so a thin oil film can be formed on the contact surface of the two. This oil film can effectively reduce the direct metal friction between the valve stem 34 and the injector housing 21, and avoid surface scratches and wear caused by friction. Especially for the valve stem 34 that moves frequently for a long time, this lubrication effect can significantly extend the service life, reduce the risk of injector failure due to component wear, and thus reduce the cost of repair and replacement of components.

[0034] The circumferential surfaces of the limiting ring 15 and the adjusting screw 12 are sleeved with an extrusion block 13. Two positioning plates 14 are installed in a horizontal sliding manner in the sliding groove 16 opened in the adjusting rod 11. The extrusion block 13 is located between the two positioning plates 14. The two extrusion blocks 13 are both fitted on the inner wall of the valve stem 34. The length of the valve stem 34 and the valve core 17 in the device can be changed according to the internal structure of different injectors. The user rotates the adjusting screw 12, and the adjusting screw 12 can be moved upward through the threaded connection between the adjusting screw 12 and the adjusting rod 11. The limiting ring 15 on the adjusting screw 12 is rotatably installed in the extrusion block 13. At this time, the extrusion block 13 will move upward, so that the two positioning plates 14 can be unloaded. At this time, the user can adjust the position of the adjusting rod 11 in the valve stem 34, thereby improving the distance between the valve stem 34 and the valve core 17 to adapt to different injectors.

[0035] Working principle:

[0036] In the first step, when the injector and the electromagnetic control valve assembly inside it are in use, the diesel enters from the oil inlet passage 27 opened in the injector housing 21, then enters the main oil passage 22 opened in the injector housing 21, and then enters the intersection of the oil outlet passage 25 opened by the valve core 17 and the valve seat 24, and is blocked by the valve core 17, and a part of the diesel will pass through the two special oil passages 23 opened in the injector housing 21, enter between the valve core 17 and the valve stem 34, and the upper and lower ends of the cavity into which the diesel enters are sealed by the sealing ring. 18 is sealed, and there will be no oil leakage. When the injector is spraying oil, the electromagnetic coil 31 is powered by the electromagnetic connector 28, so that the electromagnetic coil 31 generates magnetic force to adsorb the armature 33. At this time, the armature 33 drives the valve stem 34 to move upward, and the valve stem 34 drives the valve core 17 to move upward. The upward movement of the valve core 17 will separate from the oil outlet passage 25 opened by the valve seat 24. At this time, the diesel at the intersection of the valve core 17 and the oil outlet passage 25 opened by the valve seat 24 will be sprayed from the valve seat 24 opened by the valve seat 24. Out, and then atomized by the subsequent needle valve and needle valve body. The present invention arranges the main oil channel 22 opened in the injector housing 21 on the outside of the electromagnetic coil 31 and the armature 33. Since the main oil channel 22 through which the diesel passes is no longer located between the electromagnetic coil 31 and the armature 33, the magnetic field will not be attenuated by the diesel during operation. In this way, the magnetic field generated by the electromagnetic coil 31 can act on the armature 33 in a state closer to the theoretical strength, so that the armature 33 can respond to the magnetic field changes more sensitively, thereby improving the response speed of the injector and making the fuel injection more accurate and timely. The main oil channel 22 opened in the injector housing 21 of the present invention is arranged on the outside of the electromagnetic coil 31 and the armature 33, avoiding the interference of diesel and its impurities on the magnetic field, which helps to maintain the stability of the magnetic field. The new channel design can make the magnetic field work in a relatively stable environment, ensuring that each time the electromagnetic coil 31 is energized, the armature 33 can move in a preset manner, reducing problems such as uneven injection or injection timing deviation caused by unstable magnetic field.

[0037] In the second step, when the diesel flows out from the oil outlet passage 25 opened by the valve seat 24, there will still be a certain pressure on the diesel flowing to the space between the valve core 17 and the valve stem 34 through the special oil passage 23. This oil pressure will generate a certain thrust on the bottom of the valve stem 34, so that the valve stem 34 and the valve core 17 can move upward more easily, and when the magnetic force of the electromagnetic coil 31 disappears, the elastic force of the return spring 35 will move the valve stem 34 and the valve core 17 down to their original positions. At this time, since the pressure of this oil pressure is less than the elastic force of the return spring 35, the diesel located between the valve stem 34 and the valve core 17 will return to the special oil passage 23. The present invention opens a special oil passage 23 in the main oil passage 22 opened in the injector housing 21, and then connects it with the cavity where the valve stem 34 and the valve core 17 move. When the electromagnetic force of the electromagnetic coil 31 decays due to long-term use and the like, it is impossible to ensure that the valve stem 34 and the valve core 17 are completely opened. The diesel oil pressure through the special oil channel 23 pushes the valve stem 34 upward to make up for the lack of electromagnetic force, so that the valve stem 34 and the valve core 17 can still reach the proper opening degree, maintain the normal fuel injection function of the injector, and avoid abnormal injection or even injector failure due to the attenuation of electromagnetic force. The present invention can use the force of oil pressure to achieve the effect of auxiliary opening, which to a certain extent reduces the workload of related electromagnetic control components such as the electromagnetic coil 31 and the armature 33. The electromagnetic components do not need to always drive the valve stem 34 and the valve core 17 at their maximum capacity, thereby reducing the risk of accelerated wear and damage of these components due to excessive use and high-load operation, which helps to extend the service life of the entire injector, reduce the frequency of repairing and replacing the injector, and reduce the cost of use.

[0038] In the third step, since the diesel moves up and down between the valve stem 34 and the valve core 17 back and forth, the diesel will cover the inner wall of the injector housing 21 with a thin film. This film will not be affected by the sealing ring 18, so the film generated by the diesel will have a certain lubricating effect on the valve stem 34 and the valve core 17, so that the up and down movement of the valve stem and the valve core 17 inside the injector housing 21 can reduce wear. The present invention provides a special oil passage 23, and the diesel enters the cavity where the valve stem 34 slides in the injector housing 21 from the special oil passage 23, so that a thin oil film can be formed on the contact surface of the two. This oil film can effectively reduce the direct metal friction between the valve stem 34 and the injector housing 21, and avoid surface scratches and wear caused by friction. Especially for the valve stem 34 that moves frequently for a long time, this lubrication can significantly extend the service life, reduce the risk of injector failure caused by component wear, and thus reduce the cost of repair and replacement of components.

[0039] In the fourth step, the length of the valve stem 34 and the valve core 17 in the device can be changed according to the internal structure of different injectors. The user rotates the adjusting screw 12, and the adjusting screw 12 can be moved upward through the threaded connection between the adjusting screw 12 and the adjusting rod 11. The limiting ring 15 on the adjusting screw 12 is rotatably installed in the extrusion block 13. At this time, the extrusion block 13 will move upward, so that the two positioning plates 14 can be unloaded. At this time, the user can adjust the position of the adjusting rod 11 in the valve stem 34, thereby improving the distance between the valve stem 34 and the valve core 17 to adapt to different injectors.

[0040] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A control valve pair for an electronically controlled fuel injector, comprising a fuel injector housing (21), wherein an electromagnetic connector (28) is provided on the fuel injector housing (21), characterized in that: The injector housing (21) is provided with an electromagnetic group outer cavity and a valve group inner cavity. The electromagnetic group outer cavity provided in the injector housing (21) is provided with an electromagnetic coil (31). The electromagnetic coil (31) is electrically connected to the electromagnetic connector (28). An armature (33) is provided at the lower end of the electromagnetic coil (31). The valve group inner cavity provided in the injector housing (21) is provided with a control valve assembly. The control valve assembly comprises a valve stem (34), a valve core (17) is provided at the lower end of the valve stem (34), two sealing rings (18) are sleeved on the circumferential surfaces of the valve stem (34) and the valve core (17), and the two sealing rings (18) are fitted on the inner wall of the injector housing (21), and the lower end of the valve core (17) is fitted on the oil outlet passage (25) opened by the valve seat (24); The main oil passage (22) is opened inside the injector housing (21), and the main oil passage (22) opened in the injector housing (21) is located outside the outer cavity of the electromagnetic group. A valve seat (24) is provided inside the injector housing (21), and an oil outlet passage (25) is opened through the valve seat (24). The oil outlet passage (25) opened in the valve seat (24) is connected with the main oil passage (22). Two special oil passages (23) are opened on the inner wall of the main oil passage (22) opened in the injector housing (21), and the two special oil passages (23) are connected with the cavity in which the valve stem (34) and the valve core (17) slide in the injector housing (21).

2. The control valve assembly for an electronically controlled fuel injector according to claim 1, characterized in that: A return spring (35) is fixedly mounted on the valve stem (34); The top of the return spring (35) is fixedly connected to the fuel injector housing (21).

3. The control valve pair for an electronically controlled fuel injector according to claim 2, characterized in that: The armature (33) is fixedly mounted on the circumferential surface of the valve stem (34).

4. The control valve pair for an electronically controlled fuel injector according to claim 3, characterized in that: An oil inlet passage (27) is provided at the upper end of the fuel injector housing (21).

5. The control valve pair for an electronically controlled fuel injector according to claim 4, characterized in that: The main body oil passage (22) is connected to an oil inlet passage (27) provided in the fuel injector housing (21).

6. A control valve pair for an electronically controlled fuel injector according to claim 5, characterized in that: An adjusting rod (11) is fixedly mounted on the upper end of the valve core (17).

7. A control valve pair for an electronically controlled fuel injector according to claim 6, characterized in that: The regulating rod (11) is slidably installed in the valve stem (34); Wherein, a sliding groove (16) is provided in the adjusting rod (11).

8. The control valve assembly for an electronically controlled fuel injector according to claim 7, characterized in that: An adjusting screw rod (12) is vertically slidably installed in the sliding groove (16) provided in the adjusting rod (11); Wherein, a limiting ring (15) is fixedly mounted on the lower end of the adjusting screw rod (12).

9. The control valve pair for an electronically controlled fuel injector according to claim 8, characterized in that: The circumferential surfaces of the limiting ring (15) and the adjusting screw (12) are sleeved with an extrusion block (13); Wherein, two positioning plates (14) are installed in a transversely slidable manner in the sliding groove (16) provided on the adjusting rod (11).

10. A control valve pair for an electronically controlled fuel injector according to claim 9, characterized in that: The extrusion block (13) is located between two positioning plates (14); Wherein, the two extrusion blocks (13) are both fitted on the inner wall of the valve stem (34).

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