Injector device, internal combustion engine and method of injecting fuel

Abstract

This disclosure relates to an injector device (1) for injecting liquid fuel into the combustion chamber of an internal combustion engine. The injector device includes an injector needle (3) in an open position, allowing fuel flow from the main fuel chamber to the injector nozzle (5). Correspondingly, in a closed position, fuel flow from the main fuel chamber (4) to the injector nozzle (5) is interrupted. The needle (3) includes an internal auxiliary fuel passage (3a) and one or more needle holes (3b) for injecting auxiliary fuel into the main fuel chamber (4). This arrangement allows the auxiliary fuel to be mixed with the main fuel within the main fuel chamber (4) before fuel is injected through the nozzle (5). An internal combustion engine and a method of fuel injection are also disclosed.

Description

Technical Field

[0001] This disclosure relates to fuel injector devices, and more specifically to injector devices for directly injecting fuel into the combustion chamber of an internal combustion engine. This disclosure further relates to an internal combustion engine and a method for injecting fuel into the combustion chamber of the internal combustion engine. Background Technology

[0002] In efforts to reduce the environmental impact of emissions from internal combustion engines, particularly large compression-ignition engines, the focus has been on researching alternative fuels such as methanol-based and ammonia-based fuels. However, the use of these alternative fuels has presented several challenges. First, their energy content and combustion characteristics differ from more conventional fuels such as diesel, necessitating modifications to the ignition and combustion processes. Another challenge relates to the weaker lubricating properties of these alternative fuels, leading to increased wear on the frictional surfaces between moving parts within the fuel system.

[0003] These challenges have been mitigated by using conventional fuels alongside alternative fuels. The addition of a conventional fuel component is thought to act as an ignition enhancer, meaning that improved ignition performance helps initiate compression ignition, in addition to improving control of the combustion process by helping maintain the temperature and pressure behavior necessary for efficient combustion with alternative fuels. Conventional fuels generally allow for easier control of the phase and rate of combustion, which impacts overall performance and emissions.

[0004] One approach is to use individual injectors to inject these fuels separately. While this allows for a great deal of control over the injection, it results in a relatively complex arrangement, which is often unsuitable for retrofitting purposes or simply requires too much space to mount on the cylinder head. Furthermore, the typically weaker lubricating properties of alternative fuels necessitate additional measures to ensure trouble-free operation.

[0005] Another approach is to prepare a fuel mixture and then inject that mixture using a single injector. Because such alternative fuels are chemically immiscible with conventional fuels, additional chemical emulsifiers and / or mixing arrangements have been used to achieve mixtures with sufficiently long lifespans. The use of emulsifiers, in turn, increases costs and introduces further challenges in terms of emissions and control over the combustion and ignition processes. Summary of the Invention

[0006] One object of this disclosure is to provide an injector device that allows the mixing of fuels that are otherwise immiscible. A further object of this disclosure is to provide an internal combustion engine equipped with such an injector, and a method for injecting fuel into the combustion chamber of the internal combustion engine.

[0007] The objectives of this disclosure are achieved by an injector device, an internal combustion engine, and a method, characterized as set forth in the independent claims. Preferred embodiments of this disclosure are disclosed in the dependent claims.

[0008] This disclosure is based on the concept of mixing primary fuel and auxiliary fuel on an on-demand basis within the injector device, prior to injection into the combustion chamber. Notably, the auxiliary fuel is injected into the primary fuel chamber of the injector device from an internal channel arranged within a needle, which is used to selectively open or interrupt the flow from the primary fuel chamber to the nozzle of the injector device.

[0009] Therefore, since the emulsion of the primary and auxiliary fuels is generated immediately before being injected into the combustion chamber, the long-term stability of the emulsion is not an issue. This disclosure provides an injector device that allows such mixing of primary and auxiliary fuels, while having a relatively simple mechanical construction and simultaneously solving problems related to the internal lubrication of the injector device, thereby contributing to improved reliability.

[0010] According to a first aspect of this disclosure, an injector device is provided for injecting liquid fuel into the combustion chamber of an internal combustion engine. The injector device includes an injector body defining an internal space and an injector needle received within the internal space.

[0011] The injector also includes a main fuel chamber defined between the exterior and interior spaces of the injector needle. Notably, the main fuel chamber is capable of being fluidly connected to a main fuel supply device. For example, the injector body may include one or more suitable conduits for connecting the main fuel supply device to the main fuel chamber. The injector also includes a nozzle disposed at a distal end of the injector body. The nozzle, in turn, includes a plurality of nozzle orifices extending between the interior and exterior of the nozzle.

[0012] A needle seat is disposed between the main fuel chamber and the interior of the nozzle. Suitably, the needle seat is formed on the inner surface of the injector body. Furthermore, the injector needle extends into the main fuel chamber such that, in the closed position, the needle rests against the needle seat, thereby closing the fluid communication between the main fuel chamber and the nozzle via the needle seat. Correspondingly, in the open position, the needle is spaced apart from the needle seat, thereby allowing fluid communication between the main fuel chamber and the nozzle via the needle seat, thus allowing selective injection of main fuel through the nozzle.

[0013] Suitably, the injector device may include or be associated with an actuator configured to selectively drive the needle between an open position and a closed position. Examples of such actuators include electromechanical actuators (e.g., solenoid actuators), hydraulic actuators, pneumatic actuators, and mechanical cam drives coupled to, for example, a camshaft of an associated engine.

[0014] It is worth noting that the needle includes an internal auxiliary fuel passage extending longitudinally along the needle. The needle also includes one or more needle holes located in the portion of the needle within the main fuel chamber, extending between the internal auxiliary fuel passage and the outside of the needle. This allows auxiliary fuel to be injected into the main fuel chamber via the internal auxiliary fuel passage of the needle.

[0015] The above arrangement allows auxiliary fuel to be mixed with main fuel in the main fuel chamber before fuel is injected through the nozzle.

[0016] Because the mixing of the two fuels is completed at the injection point (i.e., the nozzle) just before the fuel enters the combustion chamber, the two fuels do not have time to separate before combustion.

[0017] In an embodiment according to a first aspect of the present disclosure, the injector device further includes an auxiliary fuel chamber that is fluidly connected to an auxiliary fuel supply device.

[0018] For example, the injector body may include one or more suitable conduits for connecting the auxiliary fuel chamber to an auxiliary fuel supply device. Suitably, the auxiliary fuel chamber may be defined between the exterior of the injector needle and the interior space of the injector body. Preferably, but not necessarily, the auxiliary fuel chamber annularly surrounds the needle.

[0019] The needle also includes one or more auxiliary fuel inlet pipes extending between the auxiliary fuel passage and the outside of the needle. Specifically, the auxiliary fuel inlet pipes are arranged such that, in the open position, they open to the auxiliary fuel chamber, thereby allowing fluid communication between the auxiliary fuel chamber and the auxiliary fuel passage via the auxiliary fuel inlet pipes. Correspondingly, in the closed position, the auxiliary fuel inlet pipes close from the auxiliary fuel chamber, thereby interrupting the fluid communication between the auxiliary fuel chamber and the auxiliary fuel passage via the auxiliary fuel inlet pipes. For example, in the closed position, the outer end of the auxiliary fuel inlet pipes may be covered by the inner wall of the internal space.

[0020] This arrangement allows for selective injection of auxiliary fuel through pinholes, thus providing greater control over the injection of auxiliary fuel.

[0021] In an embodiment according to a first aspect of this disclosure, the injector device further includes a sealing chamber defined between the exterior of the injector needle and the interior space of the injector body. Preferably, but not necessarily, the sealing chamber surrounds the needle in a ring shape.

[0022] One purpose of the sealing chamber is to prevent main fuel from leaking from the main fuel chamber into the annular gap between the needle and the injector body, particularly into the portion supporting the needle. This can be achieved by providing an auxiliary fuel or lubricant to the sealing chamber at a higher supply pressure than the main fuel.

[0023] Another purpose of this sealing chamber is to prevent needle jamming by providing lubrication based on the properties of the auxiliary fuel or lubricant. This is achieved by allowing the auxiliary fuel (typically diesel fuel, such as light fuel oil LFO) or lubricant to permeate from the sealing chamber into the annular gap between the needle and the injector body to form a lubricating film, thereby keeping the needle and the support portion of the injector body lubricated and sealed under the temperature and pressure experienced by the injector assembly. The auxiliary fuel or lubricant in the gap between the needle and its orifice provides sealing, lubrication, and thermal balance to the components, and a predetermined small amount of fuel flow around the needle ensures trouble-free operation of the needle.

[0024] Furthermore, the sealing chamber can be separate from the auxiliary fuel chamber, in which case the sealing chamber can be fluidly connected to the auxiliary fuel supply device or lubricant supply device. Alternatively, the auxiliary fuel chamber can constitute the sealing chamber, in which case the sealing chamber can be fluidly connected to the auxiliary fuel supply device. Yet another alternative is to configure the sealing chamber as a separate chamber connected to the auxiliary fuel chamber, in which case the sealing chamber can be fluidly connected to the auxiliary fuel supply device directly or via the auxiliary fuel chamber.

[0025] In an embodiment according to a first aspect of this disclosure, the main fuel chamber includes a receiving portion and a discharging portion. In this arrangement, the main fuel chamber is fluidly connected to a main fuel supply device via the receiving portion, and fluid flow from the main fuel chamber to the nozzle is arranged to occur via the discharging portion in the open position. Furthermore, a neck is disposed between the receiving portion and the discharging portion. That is, the cross-sectional area of ​​the main fuel chamber is smaller at the neck than at either the receiving or discharging portion. The injector body can thus exhibit increased material thickness at the neck, thereby achieving improved structural strength.

[0026] Preferably, but not necessarily, the neck is arranged to deflect the fluid flow from the receiving section to the discharging section toward the needle.

[0027] Preferred, but not required, pinholes are arranged at the discharge section.

[0028] In an embodiment according to a first aspect of the present disclosure, the injector body defines an additional internal space and an additional injector needle received within the additional internal space.

[0029] In this arrangement, the injector assembly also includes an auxiliary fuel chamber defined between the exterior of the auxiliary injector needle and an auxiliary internal space. Notably, the auxiliary fuel chamber is fluidly connected to an auxiliary fuel supply device. The injector assembly may also include an auxiliary nozzle disposed at the distal end of the injector body. The auxiliary nozzle, in turn, includes a plurality of auxiliary nozzle orifices extending between the interior and exterior of the auxiliary nozzle.

[0030] An auxiliary needle holder can then be arranged between the auxiliary fuel chamber and the auxiliary nozzle. Furthermore, the auxiliary injector needle extends into the auxiliary fuel chamber such that, in the closed position, the auxiliary needle rests against the auxiliary needle holder, thereby closing the fluid communication between the auxiliary fuel chamber and the auxiliary nozzle via the auxiliary needle holder. Correspondingly, in the open position, the auxiliary needle is spaced apart from the auxiliary needle holder, thereby allowing fluid communication between the auxiliary fuel chamber and the auxiliary nozzle via the auxiliary needle holder, thus allowing selective injection of auxiliary fuel through the auxiliary nozzle.

[0031] Preferably, but not necessarily, the additional needle seat is formed on the inner surface of the injector body, i.e., on the inner wall of the additional internal space.

[0032] Suitably, the injector device may include or be associated with an auxiliary actuator configured to selectively drive an auxiliary pin between an open position and a closed position. Examples of such auxiliary actuators include electromechanical actuators (e.g., solenoid actuators), hydraulic actuators, pneumatic actuators, and mechanical cam drives coupled to, for example, a camshaft of an associated engine.

[0033] It should be noted that the first aspect of this disclosure covers any combination of two or more of the above-described embodiments or variations thereof.

[0034] According to a second aspect of this disclosure, an internal combustion engine is provided, which includes a combustion chamber. Notably, the internal combustion engine also includes an injector device according to the first aspect of this disclosure as described above. Furthermore, the injector device is configured to inject fuel into the combustion chamber.

[0035] According to a third aspect of this disclosure, a method for injecting fuel into the combustion chamber of an internal combustion engine is provided. Specifically, fuel is injected into the combustion chamber using an injector device according to the first aspect of this disclosure as described above.

[0036] Furthermore, the primary fuel is supplied at the primary fuel pressure, while the auxiliary fuel is supplied at the auxiliary fuel pressure. It is noteworthy that the auxiliary fuel pressure is higher than the primary fuel pressure. It has been found that the aforementioned advantages of this disclosure can be achieved even with relatively small pressure differences, such as 10 bar. Preferably, the pressure difference can be at least 100 bar, and more preferably at least 200 bar. For example, methanol-based, ammonia-based, or alcohol-based liquid fuels can be used as the primary fuel, with a supply pressure range of 1500 to 1800 bar, while LFO or diesel fuel can be used as the auxiliary fuel, with a supply pressure range of 2000 to 2200 bar. Attached Figure Description

[0037] In the following, the present disclosure will be described in more detail with reference to the accompanying drawings, in which: Figure 1 The illustration shows a cross-sectional view of an injector device according to an embodiment of the present disclosure, shown in the needle open position; Figure 1a The diagram shows... Figure 1 Detailed views showing a portion of the needle, the main fuel chamber, and the nozzle; Figure 1b The diagram shows... Figure 1 A detailed view showing a portion of the needle and the auxiliary fuel chamber; Figure 2 The diagram shows... Figure 1 A cross-sectional view of the injector device, shown in the closed position of the needle; Figure 2a The diagram shows... Figure 2 Detailed views showing a portion of the needle, the main fuel chamber, and the nozzle; Figure 2b The diagram shows... Figure 2 Detailed views showing a portion of the needle and the auxiliary fuel chamber; and Figure 3 The illustration shows a cross-sectional view of an injector device according to an embodiment of the present disclosure, which is equipped with an additional needle and an additional nozzle, and has an alternative auxiliary fuel chamber configuration.

[0038] Figure 3a The diagram shows... Figure 3 A detailed view showing a portion of the needle and the auxiliary fuel chamber. Detailed Implementation

[0039] Figure 1 The illustration shows a cross-sectional view of the injector device 1 according to an embodiment of the present disclosure. It is worth noting that... Figure 1 The cross-sectional view shows the injector body 2 of the injector device 1, which defines an internal space 2a in which the injector needle 3 is received.

[0040] Nozzle 5 is positioned at the distal end of injector device 1. For example... Figure 1a As shown in more detail, the nozzle 5 is equipped with a plurality of nozzle orifices 5b extending between the interior 5a and the exterior of the nozzle 5 for injecting fuel from the injector assembly 1. A main fuel chamber 4 is also shown, defined between the exterior of the injector needle 3 and the interior space 2a of the injector body 2. A needle seat 6 is shown arranged between the main fuel chamber 4 and the interior 5a of the nozzle for connecting the main fuel chamber 4 to the nozzle 5.

[0041] Figure 1a The diagram further illustrates that the needle 3 is spaced apart from the needle seat 6, i.e., in the open position, where the flow of fuel from the main fuel chamber 4 to the nozzle 5 is not obstructed by the needle 3. Correspondingly, Figure 2a It clearly depicts the needle 3 resting against the needle holder 6.

[0042] also, Figure 1 The needle 3 is clearly shown to have an internal auxiliary fuel passage 3a extending longitudinally along the needle. (See diagram below.) Figure 1a As shown in more detail, the needle 3 is also equipped with a needle hole 3b, which extends between the internal auxiliary fuel passage 3a and the outside of the needle 3. Since the needle hole 3b is located in the portion of the needle 3 located in the main fuel chamber 4, it allows auxiliary fuel to be injected into the main fuel chamber 4 from the internal auxiliary fuel passage 3a.

[0043] like Figure 1b As shown, the needle 3 is also equipped with an auxiliary fuel inlet pipe 3c, which extends between the auxiliary fuel passage and the outside of the needle for supplying auxiliary fuel from the auxiliary fuel chamber 7 to the internal auxiliary fuel passage 3a. It is noteworthy that the auxiliary fuel chamber 7 is defined between the outside of the injector needle 3 and the internal space 2a of the injector body.

[0044] During operation, in the open position of valve 3, such as... Figure 1 As shown, the main fuel supplied to the main fuel chamber 4 at a certain pressure flows through the needle seat 6 into the interior 5a of the nozzle 5, and further flows outward through the nozzle orifice 5b. Simultaneously, the auxiliary fuel supplied to the auxiliary fuel chamber 7 at a relatively higher pressure flows into the auxiliary fuel channel 3a through the auxiliary inlet pipe 3c, and then further enters the main fuel chamber 4 through the needle orifice 3b. Because the auxiliary fuel is introduced into the main fuel chamber as a relatively high-pressure jet, the velocity difference between the main fuel and the auxiliary fuel achieves high-shear mixing of the two fuels. As a result, a homogeneous emulsion of the main fuel and auxiliary fuel is generated within the main fuel chamber 4, which is then injected through the nozzle orifice 5a.

[0045] When fuel injection is to be interrupted, needle 3 is positioned in the closed position, such as... Figure 2 , Figure 2a and Figure 2b As shown. It is worth noting that in the closed position, needle 3 sits abutting against needle seat 6, as... Figure 2a As clearly shown, this prevents flow from the main fuel chamber 4 to the nozzle 5. Furthermore, in the closed position of the needle 3, the auxiliary fuel inlet pipe 3c is positioned outside the auxiliary fuel chamber 7, as... Figure 2b As shown, this prevents auxiliary fuel from flowing into the internal auxiliary fuel passage 3a and further into the main fuel chamber 4. It is noteworthy that in the closed position, the outer end of the auxiliary fuel inlet pipe 3c is covered by the inner wall of the internal space 2a.

[0046] like Figure 1 and Figure 2 As shown in both, the auxiliary fuel chamber 7 also constitutes a sealed chamber 8, which is defined between the exterior of the injector needle 3 and the interior space 2a of the injector body 2. Auxiliary fuel is also supplied to the sealed chamber 8 at a relatively high pressure, allowing it to permeate into the annular gap between the needle 3 and the portion supporting the needle 3 in the interior space 2a. This both provides a lubricating film around the needle 3 and prevents the main fuel from seeping into the annular gap and washing away the lubricating film. The pressure difference between the auxiliary fuel and the main fuel is high enough to deliver sufficient main fuel to the gap between the needle 3 and the portion supporting the needle 3 in the interior space 2a to keep the needle 3 and the portion of the interior space 2a lubricated and sealed under the temperature and pressure experienced by the injector assembly 1.

[0047] Best place Figure 1a and Figure 2a As shown, the main fuel chamber 4 has a receiving portion 4a and a discharging portion 4b. Notably, the main fuel is introduced into the main fuel chamber 4 at the receiving portion 4a, and the fuel flow from the main fuel chamber 4 to the nozzle 5 is arranged to occur via the discharging portion 4b in the open position. Furthermore, a neck 4c is arranged between the receiving portion 4a and the discharging portion 4b. It is noteworthy that the cross-sectional area of ​​the main fuel chamber 4 is smaller at the neck 4c than at either the receiving portion 4a or the discharging portion 4b. Accordingly, the injector body 2a exhibits an increased material thickness at the neck 4c, thereby achieving improved structural strength. The neck 4c is further arranged to deflect the fluid flow from the receiving portion 4a to the discharging portion 4b toward the needle 3.

[0048] Figure 3 Instead, an injector device 1 according to another embodiment of the present disclosure is illustrated. Most notably, with... Figure 1 and Figure 2 Compared to the injector device, Figure 3The injector assembly is equipped with an additional injector needle 9, depicted in dashed lines, which is received within an additional internal space 2c of the injector body 2. Similarly, an additional nozzle 11 is arranged at the longitudinal end of the injector body 2, adjacent to the injector nozzle 5. Furthermore, the additional nozzle 11 has an additional nozzle orifice 11b that extends between the interior 11a and the exterior of the additional nozzle 11.

[0049] Furthermore, the auxiliary fuel chamber 10 is defined between the exterior of the auxiliary injector needle 9 and the auxiliary internal space 2b. The auxiliary needle seat 12 is arranged between the auxiliary fuel chamber 10 and the interior 11a of the auxiliary nozzle 11.

[0050] In the open position of the auxiliary injector needle 9, it is spaced apart from the auxiliary needle seat 12. This allows auxiliary fuel supplied to the auxiliary fuel chamber 10 to flow via the auxiliary needle seat 12 to the interior 11a of the auxiliary nozzle 11, and further be injected through the auxiliary nozzle orifice 11b. Correspondingly, in the closed position of the auxiliary injector needle 9 (as shown in the image), Figure 3 As shown), the auxiliary injector needle 9 is seated against the auxiliary needle seat 12. This closes the fluid communication between the auxiliary fuel chamber 10 and the auxiliary nozzle 11 via the auxiliary needle seat 12, thereby interrupting the auxiliary fuel injection via the auxiliary nozzle 11.

[0051] In addition, Figure 3 In this implementation, the configuration of the auxiliary fuel chamber 7 differs from... Figure 1 and Figure 2 The configuration of the implementation is as follows. Although similarly defined between the outside of the injector needle 3 and the internal space 2a of the injector body, the auxiliary fuel chamber 7 and the sealing chamber 8 are arranged separately. In particular, the sealing chamber 8 is positioned along the needle 3 between the auxiliary fuel chamber 7 and the main fuel chamber 4, although the sealing chamber is otherwise positioned in relation to... Figure 1 and Figure 2 The implementation method is set up in a similar manner.

[0052] Figure 3 The needle 3 is also shown in its closed position. That is, as shown... Figure 3a As better shown, the auxiliary fuel inlet pipe 3c is positioned outside the auxiliary fuel chamber 7, thereby preventing auxiliary fuel from flowing into the internal auxiliary fuel passage 3a and further into the main fuel chamber 4. Notably, in the closed position, the outer end of the auxiliary fuel inlet pipe 3c is covered by the inner wall of the internal space 2a. Figure 3 In this arrangement, opening the needle (i.e., lifting it upwards) moves the auxiliary fuel inlet pipe 3c into the auxiliary fuel chamber 7. This allows auxiliary fuel to flow into the internal auxiliary fuel passage 3a and further into the main fuel chamber 4.

[0053] List of reference numerals

[0054] 1. Injector device

[0055] 2. Injector body

[0056] 2a Interior space

[0057] 2b Additional interior space

[0058] 3. Injector needle

[0059] 3a Auxiliary fuel passage

[0060] 3b pinhole

[0061] 3c Auxiliary fuel inlet pipe

[0062] 4 Main Fuel Chamber

[0063] 4a Receiving section of the main fuel chamber

[0064] 4b Main fuel chamber exhaust section

[0065] 4c Neck

[0066] 5 nozzles

[0067] 5a Nozzle interior

[0068] 5b Nozzle orifice

[0069] 6-pin hub

[0070] 7. Auxiliary fuel chamber

[0071] 8 Sealed Chamber

[0072] 9. Additional ejector needles

[0073] 10 Additional fuel chambers

[0074] 11 Additional nozzles

[0075] 11a Internal part of the additional nozzle

[0076] 11b Additional nozzle orifice

[0077] 12 Additional pin hubs

Claims

1. An injector device (1) for injecting liquid fuel into the combustion chamber of an internal combustion engine, the injector device comprising: The injector body (2) defines an internal space (2a); The injector needle (3) is received within the internal space (2a); The main fuel chamber (4) is defined between the outside of the injector needle (3) and the internal space (2a), and the main fuel chamber (4) is fluidly connected to the main fuel supply device; The nozzle (5) is arranged at the distal end of the injector body (2), and the nozzle (5) includes a plurality of nozzle holes (5b) extending between the interior (5a) of the nozzle and the exterior of the nozzle (5). Needle seat (6), which is arranged between the main fuel chamber (4) and the interior (5a) of the nozzle, Wherein, the injector needle (3) extends into the main fuel chamber (4), such that: In the closed position, the needle (4) sits against the needle seat (6), thereby closing the fluid communication between the main fuel chamber (4) and the nozzle (5) via the needle seat (6). In the open position, the needle (3) is spaced apart from the needle seat (6), thereby allowing fluid communication between the main fuel chamber (4) and the nozzle (5) via the needle seat (6). This allows for the selective injection of main fuel through the nozzle (5). The needle (3) is characterized in that it comprises: An internal auxiliary fuel passage (3a) extends longitudinally along the needle (3), and One or more needle holes (3b) are located at a portion of the needle (3) within the main fuel chamber (4), the one or more needle holes (3b) extending between the internal auxiliary fuel passage (3a) and the outside of the needle (3), for injecting auxiliary fuel into the main fuel chamber (4). This allows the auxiliary fuel to be mixed with the main fuel in the main fuel chamber (4) before the fuel is injected through the nozzle (5).

2. The injector device (1) according to claim 1, characterized in that... Includes an auxiliary fuel chamber (7), which is fluidly connected to an auxiliary fuel supply device. The needle (3) further includes one or more auxiliary fuel inlet pipes (3c), which extend between the auxiliary fuel passage (3a) and the outside of the needle (3). The auxiliary fuel inlet pipe (3c) is arranged such that: In the open position, the auxiliary fuel inlet pipe (3c) is open to the auxiliary fuel chamber (7), thereby allowing fluid communication between the auxiliary fuel chamber (7) and the auxiliary fuel passage (3a) via the auxiliary fuel inlet pipe (3c). In the closed position, the auxiliary fuel inlet pipe (3c) is closed from the auxiliary fuel chamber (7), thereby interrupting the fluid communication between the auxiliary fuel chamber (7) and the auxiliary fuel passage (3a) via the auxiliary fuel inlet pipe (3c). This allows for the selective injection of auxiliary fuel through the pinhole (3b).

3. The injector device (1) according to claim 2, characterized in that, The auxiliary fuel chamber (7) is defined between the outside of the injector needle (3) and the internal space (2a) of the injector body (2).

4. The injector device (1) according to claim 2 or 3, characterized in that, In the closed position, the outer end of the auxiliary fuel inlet pipe (3c) is covered by the inner wall of the internal space (2a).

5. The injector device (1) according to any one of claims 1 to 4, characterized in that... Includes a sealing chamber (8) which is defined between the outside of the injector needle (3) and the internal space (2a) of the injector body (2).

6. The injector device (1) according to claim 5, characterized in that: The auxiliary fuel chamber (7) and the sealed chamber (8) are separate, wherein the sealed chamber (8) can be fluidly connected to the auxiliary fuel supply device or the lubricant supply device, or The auxiliary fuel chamber (7) constitutes the sealed chamber (8), wherein the sealed chamber (8) is fluidly connected to the auxiliary fuel supply device.

7. The injector device (1) according to any one of claims 1 to 6, characterized in that, The main fuel chamber (4) includes: The receiving section (4a) is wherein the main fuel chamber (4) is fluidly connected to the main fuel supply device via the receiving section (4a); The discharge section (4b) is configured such that fluid flow from the main fuel chamber (4) to the nozzle (5) is carried out via the discharge section (4b) in the open position. A neck (4c) is disposed between the receiving portion (4a) and the discharging portion (4b). The cross-sectional area of ​​the main fuel chamber (4) is smaller at the neck (4c) than at the receiving portion (4a) or the discharge portion (4b).

8. The injector device (1) according to any one of claims 1 to 7, characterized in that, The injector body (2) defines an additional internal space (2b), and the injector device (1) further includes: An additional injector needle (9) is received within the additional internal space (2b); An auxiliary fuel chamber (10) is defined between the outside of the auxiliary injector needle (9) and the auxiliary internal space (2b), and the auxiliary fuel chamber (10) is fluidly connected to the auxiliary fuel supply device. An additional nozzle (11) is disposed at the distal end of the injector body (2), the nozzle (11) including a plurality of additional nozzle holes (11b) extending between the interior (11a) and the exterior of the additional nozzle (11). An additional needle holder (12) is disposed between the interior (11a) of the additional fuel chamber (10) and the additional nozzle (11). Wherein, the additional injector needle (9) extends into the additional fuel chamber (10), such that: In the closed position of the auxiliary injector needle (9), the auxiliary needle (9) is seated against the auxiliary needle seat (12), thereby closing the fluid communication between the auxiliary fuel chamber (10) and the auxiliary nozzle (11) via the auxiliary needle seat (12), and In the open position of the additional injector needle (9), the additional needle (9) is spaced apart from the additional needle seat (12), thereby allowing fluid communication between the additional fuel chamber (10) and the additional nozzle (11) via the additional needle seat (12). This allows for the selective injection of auxiliary fuel through the additional nozzle (11).

9. An internal combustion engine comprising a combustion chamber, characterized in that... It also includes an injector device (1) according to any one of claims 1 to 8, wherein the injector device (1) is configured to inject fuel into the combustion chamber.

10. A method for injecting fuel into the combustion chamber of an internal combustion engine, characterized in that, Fuel is injected into the combustion chamber using the injector device according to any one of claims 1 to 9. The main fuel is supplied at the main fuel pressure. Auxiliary fuel is supplied at auxiliary fuel pressure, and The auxiliary fuel pressure is higher than the main fuel pressure.

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