A control valve assembly for an electronically controlled fuel injector

Abstract

The application discloses a control valve couple for an electrically-controlled fuel injector, and relates to the technical field of control valve couples, which 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 arranged in the fuel injector shell, the electromagnetic group outer cavity arranged in the fuel injector shell is provided with an electromagnetic coil, the electromagnetic coil is electrically connected with the electromagnetic connector, and a armature is arranged at the lower end of the electromagnetic coil. The main oil channel arranged in the fuel injector shell is arranged outside the electromagnetic coil and the armature, the main oil channel through which diesel passes is no longer located between the electromagnetic coil and the armature, the magnetic field is not subjected to the attenuation effect of diesel in the working process, the magnetic field generated by the electromagnetic coil can act on the armature in a state closer to the theoretical strength, the armature can more sensitively respond to the change of the magnetic field, and therefore the response speed of the fuel injector is improved, and fuel injection is more accurate and timely.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of control valve matching, in particular to a control valve matching for an electronically controlled fuel injector. BACKGROUND

[0002] The high-pressure common rail electronically controlled fuel injector is a key component of the electronically controlled fuel injection system of a diesel engine. It is mainly composed of an electromagnetic valve, a control piston, a needle valve, etc. By receiving the ECU signal to control the electromagnetic valve, the fuel pressure is accurately adjusted by using the control oil chamber and the throttle hole, so as to accurately control the fuel injection amount, the fuel injection time and the fuel injection rate. It has the characteristics of accurate control, flexible adjustment, high-pressure injection and rapid response, and can effectively improve the power, economy and emission performance of the engine.

[0003] The control valve matching for the electronically controlled fuel injector currently has at least the following technical problems:

[0004] Firstly, in the prior art, the magnetic field can penetrate the diesel oil, but the diesel oil is not a vacuum, and still has a certain attenuation effect on the magnetic field. The magnetic field strength gradually weakens with the increase of the penetration distance. When the thickness of the diesel oil layer is large or the diesel oil contains some impurities (such as metal particles, etc.), the attenuation of the magnetic field strength will be more obvious, and the magnetic field strength will be weakened to a certain extent due to the presence of diesel oil, resulting in that the attracting force of the armature becomes smaller and the response time is prolonged.

[0005] Secondly, in the prior art, the electromagnetic coil may be attenuated due to the magnetic hysteresis loss and eddy current loss of the iron core during long-term use. 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 deviation of the fuel injection time and the injection amount. SUMMARY

[0006] Technical problems solved

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

[0008] Technical scheme

[0009] To achieve the above purpose, the present application is implemented by the following technical scheme:

[0010] A control valve assembly for an electronically controlled fuel injector, comprising 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 arranged in the fuel injector housing, the electromagnetic group outer cavity arranged in the fuel injector housing is provided with an electromagnetic coil, the electromagnetic coil is electrically connected with the electromagnetic connector, a armature is arranged at the lower end of the electromagnetic coil, a control valve assembly is arranged in the valve group inner cavity arranged in the fuel injector housing, the control valve assembly comprises a valve rod, a valve core is arranged at the lower end of the valve body, the circumferential surface of the valve rod and the valve core is sleeved with two sealing rings, the two sealing rings are attached to the inner wall of the fuel injector housing, the lower end of the valve core is attached to the oil outlet channel arranged in the valve seat, a main oil channel is arranged in the fuel injector housing, the main oil channel arranged in the fuel injector housing is located outside the electromagnetic group outer cavity, a valve seat is arranged in the fuel injector housing, an oil outlet channel is arranged through the valve seat, the oil outlet channel arranged in the valve seat is communicated with the main oil channel, two special oil channels are arranged in the inner wall of the main oil channel arranged in the fuel injector housing, the two special oil channels are communicated with the cavity in which the valve rod and the valve core slide in the fuel injector housing.

[0011] Preferably, a return spring is fixedly installed on the valve rod, the top of the return spring is fixedly connected with the fuel injector housing, the armature is fixedly installed on the circumferential surface of the valve rod, an oil inlet channel is arranged at the upper end of the fuel injector housing, and the main oil channel is communicated with the oil inlet channel arranged in the fuel injector housing.

[0012] Preferably, an adjusting rod is fixedly installed at the upper end of the valve core, the adjusting rod is slidingly installed in the valve rod, a sliding groove is arranged in the adjusting rod, an adjusting screw is vertically slidingly installed in the sliding groove arranged in the adjusting rod, and a limiting ring is fixedly installed at the lower end of the adjusting screw.

[0013] Preferably, an extrusion block is sleeved with the circumferential surface of the limiting ring and the adjusting screw, two positioning plates are transversely slidingly installed in the sliding groove arranged in the adjusting rod, the extrusion block is located between the two positioning plates, and the two extrusion blocks are attached to the inner wall of the valve rod.

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

[0015] One: the main oil channel arranged in the fuel injector housing is arranged outside the electromagnetic coil and the armature, so that the magnetic field in the working process is not subject to the attenuation effect of diesel oil, 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 more sensitively to the change of the magnetic field, thereby improving the response speed of the fuel injector and making the fuel injection more accurate and timely.

[0016] Two: the main oil passage of the inner injector housing is arranged outside the electromagnetic coil and the armature, which avoids the interference of diesel and impurities on the magnetic field, helps to maintain the stability of the magnetic field, and the new passage design can make the magnetic field work in a relatively stable environment, ensure that the armature can move in the preset mode every time the electromagnetic coil is energized, and reduce problems such as uneven injection or injection time deviation caused by unstable magnetic field.

[0017] Three: the special oil passage is arranged in the main oil passage of the injector housing, and then is communicated with the cavity in which the valve rod and the valve core move, so that when the electromagnetic force of the electromagnetic coil is attenuated due to long-term use or other reasons, the valve rod and the valve core cannot be completely opened. The diesel oil pressure of the special oil passage can compensate for the insufficient electromagnetic force to make the valve rod and the valve core still open to the required extent, maintain the normal fuel injection function of the injector, and avoid the abnormal injection or even the failure of the injector caused by the attenuation of the electromagnetic force.

[0018] Four: the present application can achieve the auxiliary opening function by means of the force of oil pressure, which can reduce the working burden of the electromagnetic coil, armature and other related electromagnetic control components to a certain extent. The electromagnetic components do not need to drive the valve rod and the valve core with the maximum capacity all the time, thereby reducing the risk of accelerated wear and damage of these components due to overuse and high load operation, helping to prolong the service life of the entire injector, reduce the frequency of maintenance and replacement of the injector, and reduce the use cost.

[0019] Five: the special oil passage and the diesel oil entering the cavity in which the valve rod slides in the injector housing can form a thin oil film on the contact surface between the two, which can effectively reduce the direct metal friction between the valve rod and the injector housing, avoid surface scratches and wear caused by friction, and significantly prolong the service life of the valve rod which moves frequently for a long time. Reduce the risk of injector failure caused by component wear, and further reduce the cost of maintenance and replacement of components. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application and can be implemented according to the content of the specification, the following will be described in detail with the preferred embodiments of the present application and with the help of the drawings.

[0021] Figure 1 is the overall structure diagram of the present application;

[0022] Figure 2 is the structure diagram of the injector housing of the present application;

[0023] Figure 3 is the structure diagram of the valve seat of the present application;

[0024] Figure 4 Figure 1 is a structural diagram of a valve stem of the present application;

[0025] Figure 5 Figure 2 is a structural diagram of a valve core of the present application;

[0026] Figure 6 Figure 3 is a structural diagram of an adjusting rod of the present application;

[0027] Figure 7 Figure 4 is a structural diagram of a sealing ring of the present application;

[0028] Figure 8 Figure 5 is an enlarged view of A of the present application. Figure 7

[0029] Figure 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, oil injector shell; 22, main oil passage; 23, special oil passage; 24, valve seat; 25, oil outlet passage; 27, oil inlet passage; 28, electromagnetic connector; 31, electromagnetic coil; 33, armature; 34, valve stem; 35, return spring. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be further described in detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0031] Example: as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 ​As shown, in order to solve the problems in the prior art, the application provides a control valve assembly for an electrically controlled fuel injector, which is an electrically controlled high-pressure common rail fuel injector, comprising a fuel injector shell 21, the fuel injector shell 21 is provided with an electromagnetic connector 28, the fuel injector shell 21 is internally provided with an electromagnetic group outer cavity and a valve group inner cavity, the electromagnetic group outer cavity provided by the fuel injector shell 21 is provided with an electromagnetic coil 31, the electromagnetic coil 31 is electrically connected with the electromagnetic connector 28, the lower end of the electromagnetic coil 31 is provided with an armature 33, the valve group inner cavity provided by the fuel injector shell 21 is internally provided with a control valve assembly, the control valve assembly comprises a valve rod 34, the lower end of the valve rod 34 is provided with a valve core 17, the circumferential surface of the valve rod 34 and the valve core 17 is sleeved with two sealing rings 18, and the two sealing rings 18 are both attached to the inner wall of the fuel injector shell 21, the lower end of the valve core 17 is attached to an oil outlet oil channel 25 provided by a valve seat 24, a main oil channel 22 is provided in the fuel injector shell 21, and the main oil channel 22 provided by the fuel injector shell 21 is located outside the electromagnetic group outer cavity, the fuel injector shell 21 is internally provided with the valve seat 24, the valve seat 24 is provided with the oil outlet oil channel 25, the oil outlet oil channel 25 provided by the valve seat 24 is communicated with the main oil channel 22, two special oil channels 23 are provided on the inner wall of the main oil channel 22 provided by the fuel injector shell 21, and the two special oil channels 23 are both communicated with the cavity in which the valve rod 34 and the valve core 17 slide in the fuel injector shell 21, when the fuel injector and the electromagnetic control valve assembly in the fuel injector are used, diesel oil enters from an oil inlet oil channel 27 provided by the fuel injector shell 21, then enters the main oil channel 22 provided by the fuel injector shell 21, and then enters the oil outlet oil channel 25 provided by the valve core 17 and the valve seat 24, is blocked by the valve core 17, and a part of the diesel oil enters between the valve core 17 and the valve rod 34 through the two special oil channels 23 provided by the fuel injector shell 21, and the upper and lower ends of the cavity are both sealed by the sealing rings 18, so that the oil leakage phenomenon does not occur, when the fuel injector sprays, the electromagnetic coil 31 is powered through the electromagnetic connector 28, so that the electromagnetic coil 31 generates a magnetic force to adsorb the armature 33, at this time, the armature 33 drives the valve rod 34 to move upward, the valve rod 34 drives the valve core 17 to move upward, the upward movement of the valve core 17 separates the valve core 17 from the oil outlet oil channel 25 provided by the valve seat 24, at this time, the diesel oil at the intersection of the valve core 17 and the oil outlet oil channel 25 provided by the valve seat 24 is sprayed from the valve seat 24, and then is atomized through a subsequent needle valve and a needle valve body, the main oil channel 22 provided by the fuel injector shell 21 is arranged outside the electromagnetic coil 31 and the armature 33, because the main oil channel 22 through which the diesel oil passes is no longer located between the electromagnetic coil 31 and the armature 33, the magnetic field is not affected by the attenuation of the diesel oil in the working process, so that the magnetic field generated by the electromagnetic coil 31 can act on the armature 33 in a state closer to the theoretical strength, the armature 33 can more sensitively respond to the change of the magnetic field, thereby improving the response speed of the fuel injector, making the fuel injection more accurate and timely,The main oil channel 22 of the inner fuel injector shell 21 is arranged outside the electromagnetic coil 31 and the armature 33, avoids the interference of diesel oil and impurities on the magnetic field, helps to maintain the stability of the magnetic field, the new channel design can make the magnetic field work in a relatively stable environment, ensures that the armature 33 can move in a preset mode every time the electromagnetic coil 31 is energized, reduces the problems such as uneven fuel injection or deviation of fuel injection time caused by unstable magnetic field.

[0032] The reset spring 35 is fixedly installed on the valve rod 34, the top of the reset spring 35 is fixedly connected with the fuel injector shell 21, the armature 33 is fixedly installed on the circumferential surface of the valve rod 34, the upper end of the fuel injector shell 21 is provided with an oil inlet channel 27, the main oil channel 22 is through the oil inlet channel 27 of the fuel injector shell 21, when the diesel oil flows out from the oil outlet channel 25 of the valve seat 24, the diesel oil between the valve core 17 and the valve rod 34 still has a certain pressure through the special oil channel 23, the oil pressure generates a certain thrust on the bottom of the valve rod 34, so that the valve rod 34 and the valve core 17 are more easily moved upward, and when the magnetic force of the electromagnetic coil 31 disappears, the elastic force of the reset spring 35 makes the valve rod 34 and the valve core 17 move downward to the original position, at this time, because the pressure of the oil pressure is less than the elastic force of the reset spring 35, the diesel oil between the valve rod 34 and the valve core 17 returns to the special oil channel 23, the diesel oil pressure through the special oil channel 23 in the main oil channel 22 of the fuel injector shell 21 can compensate for the deficiency of the electromagnetic force when the electromagnetic force of the electromagnetic coil 31 decays due to long-term use, so that the valve rod 34 and the valve core 17 can still reach the required opening degree, maintain the normal fuel injection function of the fuel injector, avoid the abnormal fuel injection and even the failure of the fuel injector caused by the decay of the electromagnetic force, the present application can assist the opening by the force of the oil pressure, to a certain extent, reduces the working burden of the electromagnetic coil 31, the armature 33 and other related electromagnetic control components, the electromagnetic components do not need to drive the valve rod 34 and the valve core 17 with the maximum capacity all the time, so as to reduce the risk of accelerated wear and damage of these components due to overuse and high load operation, helps to prolong the service life of the entire fuel injector, reduces the frequency of maintenance and replacement of the fuel injector, and reduces the use cost.

[0033] The adjusting rod 11 is fixedly installed on the upper end of the valve core 17, penetrates and is slidably installed in the valve rod 34, the sliding groove 16 is formed in the adjusting rod 11, the adjusting screw 12 is vertically and slidably installed in the sliding groove 16 of the adjusting rod 11, and the limiting ring 15 is fixedly installed at the lower end of the adjusting screw 12. Since the diesel oil moves up and down between the valve rod 34 and the valve core 17, the diesel oil can cover a thin film on the inner wall of the injector housing 21, the thin film is not affected by the sealing ring 18, and therefore the thin film generated by the diesel oil can lubricate the valve rod 34 and the valve core 17, so that the up-and-down movement of the valve rod 34 and the valve core 17 in the injector housing 21 can reduce the abrasion. The special oil channel 23 is arranged, and the diesel oil enters the cavity in which the valve rod 34 slides in the injector housing 21 from the special oil channel 23, so that a thin oil film can be formed on the contact surface of the two, the oil film can effectively reduce the direct metal friction between the valve rod 34 and the injector housing 21, avoid surface scratches and abrasion caused by friction, and the like, especially for the valve rod 34 which moves frequently for a long time, the lubricating effect can significantly prolong the service life, reduce the risk of injector failure caused by component abrasion, and further reduce the cost of maintenance and replacement of components.

[0034] The limiting ring 15 and the circumferential surface of the adjusting screw 12 are sleeved with the extrusion block 13, the two positioning plates 14 are transversely and slidably installed in the sliding groove 16 of the adjusting rod 11, the extrusion block 13 is located between the two positioning plates 14, and the two extrusion blocks 13 are attached to the inner wall of the valve rod 34. The length between the valve rod 34 and the valve core 17 in the device can be changed according to the structure inside different injectors, the user rotates the adjusting screw 12, 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 rod 34, so as to improve the distance between the valve rod 34 and the valve core 17, so as to adapt to different injectors.

[0035] Working principle:

[0036] First, the oil injector and its internal electromagnetic control valve assembly in use, diesel from the oil injector housing 21 opening oil inlet 27 into the main oil channel 22, then into the oil injector housing 21 opening, the valve core 17 and valve seat 24 opening oil outlet 25 interface, blocked by the valve core 17, and a part of the diesel will pass through the oil injector housing 21 opening two special oil 23, into the valve core 17 and valve stem 34 between, and into the cavity upper and lower end are sealed by the sealing ring 18, will not appear oil leakage phenomenon, when the oil injector for oil injection, through the electromagnetic connector 28 to the electromagnetic coil 31 power supply, so that the electromagnetic coil 31 generates magnetic force, the armature 33 is adsorbed, the armature 33 drives the valve stem 34 to move up, the valve stem 34 drives the valve core 17 to move up, the valve core 17 will be separated from the valve seat 24 opening oil outlet 25, the diesel at the valve core 17 and the valve seat 24 opening oil outlet 25 interface will be sprayed from the valve seat 24 opening valve seat 24, then through the needle valve and needle valve body atomization, the oil injector housing 21 opening main oil channel 22 is arranged outside the electromagnetic coil 31 and the armature 33, since the diesel through the main oil channel 22 is no longer between the electromagnetic coil 31 and the armature 33, the magnetic field in the working process will not be affected by the attenuation of diesel, so that the electromagnetic coil 31 generated magnetic field can be closer to the theoretical strength of the state of action on the armature 33, the armature 33 can more sensitive response to the magnetic field change, thereby improving the response speed of the oil injector, the fuel injection is more accurate and timely, the oil injector housing 21 opening main oil channel 22 is arranged outside the electromagnetic coil 31 and the armature 33, avoids the interference of diesel and its impurities on the magnetic field, helps to maintain the stability of the magnetic field, the new channel design can make the magnetic field work in a relatively stable environment, ensure that the armature 33 can move according to the preset mode every time the electromagnetic coil 31 power on, reduce the problem of uneven injection or injection time deviation caused by unstable magnetic field.

[0037] Second step, when the diesel fuel flows out from the oil outlet channel 25 opened by the valve seat 24, the diesel fuel between the valve stem 34 and the valve core 17 still has a certain pressure through the special oil channel 23, and the 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 are more easily moved upwards, and when the magnetic force of the electromagnetic coil 31 disappears, the elastic force of the reset spring 35 will make the valve stem 34 and the valve core 17 move downwards to the original position, at this time, because the pressure of the oil pressure is less than the elastic force of the reset spring 35, the diesel fuel between the valve stem 34 and the valve core 17 will return to the special oil channel 23, the special oil channel 23 is opened in the main oil channel 22 of the oil injector shell 21, and then it is communicated with the cavity in which the valve stem 34 and the valve core 17 move, when the electromagnetic force of the electromagnetic coil 31 is attenuated due to long-term use and other reasons, the valve stem 34 and the valve core 17 cannot be completely opened. The diesel oil pressure through the special oil channel 23 can compensate for the lack of electromagnetic force to make the valve stem 34 and the valve core 17 still reach the required opening degree, maintain the normal fuel injection function of the oil injector, avoid the abnormal injection caused by the attenuation of the electromagnetic force, and even avoid the failure of the oil injector. The present application can assist in opening by the force of the oil pressure, to a certain extent, the working burden of the electromagnetic coil 31, the armature 33 and other related electromagnetic control components is reduced, the electromagnetic components do not need to drive the valve stem 34 and the valve core 17 with the maximum capacity all the time, thereby reducing the risk of accelerated wear and damage of these components due to overuse and high load operation, which helps to prolong the service life of the entire oil injector, reduce the frequency of maintenance and replacement of the oil injector, and reduce the use cost.

[0038] Third step, because the diesel fuel moves up and down between the valve stem 34 and the valve core 17, a thin film will be formed on the inner wall of the oil injector shell 21, and the thin film will not be affected by the sealing ring 18, so the thin film generated by the diesel fuel 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 34 and the valve core 17 in the oil injector shell 21 can reduce the wear, the special oil channel 23 is arranged in the present application, and the diesel fuel enters the cavity in which the valve stem 34 slides in the oil injector shell 21 through the special oil channel 23, so that a thin oil film is formed on the contact surface of the two, which can effectively reduce the direct metal friction between the valve stem 34 and the oil injector shell 21, avoid surface scratches and wear caused by friction, and the like. Especially for the valve stem 34 which moves frequently for a long time, the lubricating effect can significantly prolong the service life, reduce the risk of oil injector failure caused by component wear, and further reduce the cost of maintenance and replacement of components.

[0039] Fourthly, the length between the valve stem 34 and the valve core 17 in the device can be changed according to the structure inside different injectors. The user rotates the adjusting screw 12, and through the threaded connection between the adjusting screw 12 and the adjusting rod 11, the adjusting screw 12 can be moved upward. 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, so as to improve the distance between the valve stem 34 and the valve core 17, so as to adapt to different injectors.

[0040] Finally, it should be noted that: obviously, the above embodiments are only examples for clearly illustrating the present application, and are not limitations on the embodiments. Based on the above description, those skilled in the art can also make other different forms of changes or variations. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A control valve couple for an electronically controlled fuel injector, comprising a fuel injector housing (21) provided with an electromagnetic connector (28), characterized in that: The oil injector shell (21) is internally provided with an electromagnetic group outer cavity and a valve group inner cavity, the electromagnetic group outer cavity of the oil injector shell (21) is provided with an electromagnetic coil (31), the electromagnetic coil (31) is electrically connected with an electromagnetic connector (28), the lower end of the electromagnetic coil (31) is provided with an armature (33), and the valve group inner cavity of the oil injector shell (21) is internally provided with a control valve assembly; The control valve assembly comprises a valve rod (34), the lower end of the valve rod (34) is provided with a valve core (17), the circumferential surface of the valve rod (34) and the valve core (17) is sleeved with two sealing rings (18), the two sealing rings (18) are attached to the inner wall of the oil injector shell (21), and the lower end of the valve core (17) is attached to an oil outlet oil channel (25) of a valve seat (24). The oil injector shell (21) is internally provided with a main oil channel (22), and the main oil channel (22) of the oil injector shell (21) is located outside the electromagnetic group outer cavity, the oil injector shell (21) is internally provided with a valve seat (24), the valve seat (24) is provided with an oil outlet oil channel (25), the oil outlet oil channel (25) of the valve seat (24) is in communication with the main oil channel (22), and the inner wall of the main oil channel (22) of the oil injector shell (21) is provided with two special oil channels (23), and the two special oil channels (23) are in communication with the cavity in which the valve rod (34) and the valve core (17) slide in the oil injector shell (21).

2. A control valve couple for an electronically controlled fuel injector according to claim 1, characterized in that: The valve rod (34) is fixedly provided with a reset spring (35). The reset spring (35) is fixedly connected with the oil injector shell (21).

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

4. A control valve couple for an electronically controlled fuel injector according to claim 3, characterized in that: The upper end of the oil injector shell (21) is provided with an oil inlet oil channel (27).

5. A control valve couple for an electronically controlled fuel injector according to claim 4, characterized in that: The main oil channel (22) is in communication with the oil inlet oil channel (27) of the oil injector shell (21).

6. A control valve couple for an electronically controlled fuel injector according to claim 5, characterized in that: The valve core (17) is fixedly provided with an adjusting rod (11) at the upper end.

7. A control valve couple for an electronically controlled fuel injector according to claim 6, characterized in that: The adjusting rod (11) is slidingly installed in the valve rod (34). The adjusting rod (11) is internally provided with a sliding groove (16).

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

9. A control valve couple for an electronically controlled fuel injector according to claim 8, characterized in that: The limiting circular ring (15) and the circumferential surface of the adjusting screw (12) are sleeved with an extrusion block (13). The sliding groove (16) of the adjusting rod (11) is laterally slidingly provided with two positioning plates (14).

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

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