Method of armature lift feedback setting of injector

Abstract

A method for controlling armature lift feedback setting of an injector of a vehicle includes a primary lift formed by deforming a positioning ring or a stopper by primary laser welding in a circumferential direction with a lower end portion of the positioning ring or an upper end portion of the stopper as a first welding portion, and a target lift formed by deforming the positioning ring or the stopper by secondary laser welding in a circumferential direction with the lower end portion of the positioning ring or the upper end portion of the stopper as a second welding portion. The target lift may be achieved by a secondary weld performed in the circumferential direction according to a number of welds set with respect to a tolerance range of the primary lift with respect to the target lift, with an intermediate portion of the positioning ring or stopper as a secondary weld portion. The method further includes adjusting the number of welds according to a variable laser output to accurately obtain armature lift dispersion relative to the locating ring or stop.

Description

Technical Field

[0001] This disclosure relates to vehicle components and methods of manufacturing injectors for vehicles, and more specifically, to a method for controlling armature lift feedback settings for injectors, which may include fixing a stop or locating ring by welding and then retracting the insert portion. Background Technology

[0002] Diesel engines may include common rail (CR) fuel injection systems, where valves, armatures, and armature pins are key components of the injector, influencing the hydraulic differential in the injector (e.g., a diesel injector). Fuel injectors play a crucial role in affecting energy efficiency and reducing gaseous and particulate emissions.

[0003] Typically, an injector (e.g., a high-pressure gasoline injector for a vehicle engine) is operated by a solenoid and consists of a magnetic circuit component for generating the magnetic force required to operate the injector and an injector action component, and is lifted by the impact force of an armature, which is generated by the magnetic force of the solenoid.

[0004] Therefore, the armature lift applied to the injector (i.e., the clearance from the stop or locating ring to the armature) is a key design factor that determines the behavior of the armature during opening and closing times, and the armature lift dispersion affects both behavior and flow dispersion.

[0005] For example, a larger armature lift increases the damping distance, allowing for a smoother decay of armature momentum due to fluid, but delays the opening time. Conversely, a smaller armature lift results in a smaller damping distance, leading to poorer decay of armature momentum, which can cause bounce after the locating ring impact, and when multiple stages of injection are applied, the opening behavior of subsequent injections is adversely affected by the occurrence of bounce.

[0006] Therefore, the armature lift can be set by the weld shrinkage caused by relatively high-power laser welding after the stop component is inserted, and thus the upper armature lift is formed by the gap (or distance) from the stop component to the top surface of the armature, or it can be set by the weld shrinkage caused by relatively high-power laser welding after the locating ring component is inserted, thus the lower armature lift is formed by the gap (or distance) from the locating ring to the bottom surface of the armature.

[0007] However, laser welding for armature lift setting takes into account fixing the stop or positioning ring component with laser output, and in this method, excessive laser output increases the armature lift dispersion, which significantly affects the behavior and flow dispersion of the needle / armature. Summary of the Invention

[0008] Therefore, considering the above points, this disclosure aims to provide a method for setting the armature lift feedback of an injector for a vehicle, which can reduce the dispersion of the armature lift setting by welding a fixed stop or positioning ring and then shrinking the insertion portion, and in particular, accurately obtain the armature lift dispersion by controlling the number of welding operations of a variable laser output.

[0009] According to this disclosure, a method for setting armature lift feedback for controlling an injector of a vehicle includes the following steps: fixing a stop to a needle bar and assembling an armature to the needle bar; performing a primary welding on the locating ring by inserting a locating ring into the needle bar to generate a primary deformation of the locating ring and form a primary lift relative to a target lift of the lower armature lift; and performing a secondary welding on the locating ring: by setting a number of welding operations within the tolerance range of the primary lift relative to the target lift, and by setting the number of welding operations, causing the locating ring to generate a secondary deformation, thereby achieving the target lift.

[0010] Furthermore, the primary deformation of the positioning ring can be achieved by primary laser welding in the circumferential direction of the positioning ring. Additionally, the secondary deformation of the positioning ring can be achieved by secondary laser welding in the circumferential direction of the positioning ring.

[0011] According to another aspect of this disclosure, a method for setting armature lift feedback for an injector is provided, comprising: fixing a stop to a needle bar and assembling an armature to the needle bar; performing a primary welding on the positioning ring by inserting a positioning ring into the needle bar, generating a primary deformation of the positioning ring by primary laser welding in the circumferential direction of the positioning ring, and forming a primary lift relative to a target lift of the lower armature lift; and performing a secondary welding on the positioning ring: by setting a number of welding operations within a tolerance range of the primary lift relative to the target lift, and by performing secondary laser welding in the circumferential direction of the positioning ring by setting the number of welding operations, causing the positioning ring to generate a secondary deformation, thereby achieving the target lift.

[0012] The output of the primary laser welding is greater than the output of the secondary laser welding, which causes the primary deformation of the positioning ring to be greater than the secondary deformation.

[0013] When the tolerance range is 20%, the secondary laser welding aligned with the target lift decreases the lift shrinkage in sequence with at least three welding outputs to achieve the target lift; when the tolerance range is 15%, the secondary laser welding aligned with the target lift decreases the lift shrinkage in sequence with at least two welding outputs to achieve the target lift; and when the tolerance range is 10%, the secondary laser welding aligned with the target lift decreases the lift shrinkage in sequence with one welding output to achieve the target lift.

[0014] The primary laser welding uses the lower end portion of the ring body as the primary welding portion of the positioning ring; and the secondary laser welding uses the middle portion of the ring body as the secondary welding portion of the positioning ring, thereby moving upward toward the armature.

[0015] The positioning ring has a rigid body portion formed on the lower part of the ring body, and a shaft hole with an inner diameter corresponding to the needle bar passes through the ring body. The rigid body portion has an outer diameter larger than the ring body. The primary laser welding uses the lower end portion of the ring body as the primary welding portion of the positioning ring, and the secondary laser welding uses the middle portion of the rigid body portion or the support portion as the secondary welding portion of the positioning ring to move upward toward the armature. The output of the secondary laser welding is equal to or less than the output of the primary laser welding.

[0016] According to this disclosure, a method for setting armature lift feedback for controlling an injector of a vehicle includes the following steps: fixing a stop to a needle bar and assembling an armature to the needle bar; performing a primary weld on the stop by inserting the stop into the needle bar to generate a primary deformation of the stop and form a primary lift relative to a target lift of the upper armature; and performing a secondary weld on the stop: by setting a number of welds within a tolerance range of the primary lift relative to the target lift, and by setting the number of welds, causing the stop to generate a secondary deformation, thereby achieving the target lift.

[0017] Furthermore, the primary deformation of the stop can be achieved by primary laser welding in the circumferential direction of the stop. Additionally, the secondary deformation of the stop can be achieved by secondary laser welding in the circumferential direction of the stop.

[0018] According to another aspect of this disclosure, a method for setting armature lift feedback for an injector is provided, comprising: fixing a stop to a needle bar and assembling an armature to the needle bar; performing primary welding on the stop by inserting the stop into the needle bar, generating primary deformation of the stop by primary laser welding in the circumferential direction of the stop, and forming a primary lift relative to a target lift of the upper armature lift; and performing secondary welding on the stop: by setting a number of welding operations within a tolerance range of the primary lift relative to the target lift, and by performing secondary laser welding in the circumferential direction of the stop by the set number of welding operations, causing secondary deformation of the stop to be generated, thereby achieving the target lift.

[0019] The output of the primary laser welding is greater than the output of the secondary laser welding, which causes the primary deformation of the stop to be greater than the secondary deformation.

[0020] When the tolerance range is 20%, the secondary laser welding aligned with the target lift decreases the lift shrinkage amount sequentially with at least three welding outputs to achieve the target lift; when the tolerance range is 15%, the secondary laser welding aligned with the target lift decreases the lift shrinkage amount sequentially with at least two welding outputs to achieve the target lift; and when the tolerance range is 10%, the secondary laser welding aligned with the target lift decreases the lift shrinkage amount sequentially with one welding output to achieve the target lift.

[0021] The stop is formed between the upper flange of the upper part and the lower flange of the lower part. The stop body forms a gap with the needle bar through an expansion hole. The inner diameter of the expansion hole is larger than the inner diameter of the shaft hole. The shaft hole has an inner diameter corresponding to the needle bar, thereby performing the secondary laser welding. The primary laser welding uses the upper flange of the stop as the primary welding part of the stop, and the secondary laser welding uses the stop body as the secondary welding part of the stop to move downward toward the armature. Attached Figure Description

[0022] Figure 1 An example of an injector in which armature lift feedback settings according to this disclosure are applied is shown.

[0023] Figure 2A , Figure 2B and Figure 2C An example of a method for setting armature lift feedback for an injector is shown, which forms the lower armature lift (i.e., the positioning ring side) of the injector according to this disclosure.

[0024] Figure 3 An example of a rigid deformation structure for a positioning ring is shown.

[0025] Figure 4 An example of a rigid deformation structure of a positioning ring according to this disclosure is shown.

[0026] Figure 5A , Figure 5B and Figure 5C An example of a method for setting the armature lift feedback of an injector is shown, which forms the upper armature lift (i.e., the stop side) of the injector according to this disclosure. Detailed Implementation

[0027] It should be understood that the terms "vehicle" or "of vehicles" or other similar terms as used herein generally include motor vehicles (such as passenger cars including SUVs, buses, trucks, and various commercial vehicles), water vehicles (including various boats and ships), aircraft, etc., and include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum). As described herein, a hybrid vehicle is a vehicle with two or more power sources, such as a gasoline-powered and an electric-powered vehicle.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that, when used in this specification, the terms “comprises” and / or “comprising” specify the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Throughout this specification, unless expressly stated to the contrary, the word “comprise” and variations such as “comprises” or “comprising” will be understood to imply the inclusion of the stated elements, but do not exclude any other elements. Furthermore, the terms “unit,” “…device (-er),” “…device (or),” and “module” described in the specification refer to a unit for performing at least one function and operation, and may be implemented by hardware components or software components and combinations thereof.

[0029] Furthermore, the control logic of this disclosure can be implemented as a non-transitory computer-readable medium on a computer-readable medium, which includes executable program instructions that are executed by a processor, controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, optical disc (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable medium can also be distributed across a network-connected computer system, such that the computer-readable medium is stored and executed in a distributed manner, for example, via a telematics server or a controller area network (CAN).

[0030] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. These embodiments are exemplary and may be implemented in various different forms by those skilled in the art to which the present disclosure pertains, and are therefore not limited to the embodiments disclosed herein.

[0031] Reference Figure 1 The injector 1 includes a magnetic circuit unit 1a and an injector actuation unit 1b, and the magnetic circuit unit 1a includes an armature 3 and a magnetic core / coil. The injector actuation unit 1b includes a stop 8, a needle bar 5, and a positioning ring 7, and is connected to a ball / valve seat that is opened and closed by the needle bar 5.

[0032] Therefore, the ejector 1 is a solenoid-operated ejector, and as the armature 3 is raised, the needle (i.e., the needle bar 5) is raised by "magnetic force + armature impact force", and when the current signal stops, the needle and the armature move downward at the closing time point at the same time, so that the needle and the armature are restored sequentially.

[0033] To this end, armature 3 moves upward by the magnetic force generated by the magnetic core / coil, receiving the impact force and magnetic force generated when armature 3 moves upward, and transmitting the magnetic force to the stop 8 that opens the injector valve. When armature 3 moves upward, needle rod 5 opens the injector valve through the ball of the valve seat. Positioning ring 7 forms an armature positioning ring impact surface at the closing time of the injector valve, thereby controlling the behavior of armature 3.

[0034] The armature lift of the injector 1 is defined by the gap (or distance) between the bottom surface of the stop 8 and the top surface of the armature 3, which is referred to as the up lift. Furthermore, the lift defined by the gap (or distance) between the top surface of the locating ring 7 and the bottom surface of the armature 3 is referred to as the down lift.

[0035] In other words, when the stop is first fixed and then the lift is set according to the welding of the positioning ring, the armature lift of the armature becomes the upward lift, and when the positioning ring is first fixed and then the lift is set according to the welding of the stop, the armature lift of the armature becomes the downward lift.

[0036] First, the process of forming an ascent will be described.

[0037] After assembling the needle bar 5, the stop 8 and the armature 3, the armature lift is determined by the position of the positioning ring 7, and the positioning ring 7 is fixed to the needle bar 5 by welding.

[0038] During the cooling period after welding, the locating ring 7 contracts, changing the lift between the locating ring 7 and the bottom surface of the armature 3. Furthermore, as the heat input increases due to the increase in welding output, the deformation dispersion increases, leading to an increase in lift dispersion.

[0039] Therefore, in this disclosure, welding is not accomplished by a single first weld with a large heat input, but rather the total heat input and the number of welds are separated.

[0040] In other words, primary welding is performed under primary heat input, secondary welding is performed under secondary heat input, and finally, primary welding is performed to reduce heat input and dispersion, followed by secondary and tertiary welding as needed, and welding is performed from the bottom surface of the positioning ring 7 toward the top surface (i.e., toward the bottom surface of the armature), thereby reducing lift dispersion and achieving the target lift.

[0041] Therefore, during the Nth welding, a large heat input is applied in the circumferential direction by the needle bar 5 to perform primary laser welding, so as to form a primary lift with large deformation dispersion.

[0042] Subsequent secondary laser welding is performed as a two-step laser welding process, in which the laser output determined based on the primary lift setting data is applied in the circumferential direction without passing through the needle bar 5, thereby achieving the target lift.

[0043] Therefore, compared with primary laser welding, the increase in lift during secondary laser welding is reduced, and the output of secondary welding is equal to or less than that of primary welding.

[0044] The fact that the heat input does not pass through the needle bar 5 means that, unlike the laser output used for direct welding in the first step, the laser is emitted from the outside starting from the second step. Therefore, the welding heat is transferred through the positioning ring 7, but prevented from affecting the welding surface through the needle bar 5.

[0045] Therefore, in primary welding and secondary welding, primary welding refers to the welding in which the output of the primary laser fixes the positioning ring 7 or the stop 8 to the needle bar 5, while secondary welding refers to the process in which the output of the secondary laser does not fix the positioning ring 7 or the stop 8 to the needle bar 5, but partially melts the positioning ring 7 or the stop 8, and then shrinks only due to cooling.

[0046] As defined above regarding secondary welding, it should be understood that “secondary welding” or “secondary laser welding” in the following text refers to the shrinkage caused by the partial melting and subsequent cooling of the positioning ring 7 or the stop 8, rather than fixing the positioning ring 7 or the stop 8 to the needle bar 5.

[0047] In particular, a feedback setting method is used to perform secondary laser welding, which uses laser outputs with different heat inputs for each weld. These different heat inputs are determined based on the difference between the primary lift and the target lift, thereby achieving the target lift and thus minimizing lift dispersion after the primary and secondary welds are completed.

[0048] Furthermore, apart from the primary welds in multiple welds, the welding positions starting from the secondary welds are either the same or move towards the armature 3. In this case, the welding position movement in the locating ring 7 or the stop 8 is the same.

[0049] Reference Figure 2A , Figure 2B and Figure 2C The method for setting the armature lift feedback of the injector 1 includes assembling other components (S10), performing primary welding on the positioning ring (S20), and performing secondary welding on the positioning ring (S30), and applying the lower armature lift set by the gap (or distance) between the top surface of the positioning ring 7 and the bottom surface of the armature 3 to the injector 1.

[0050] like Figure 2A As shown, the assembly of other components (S10) includes fixing the stop 8 to the needle bar 5, assembling the armature 3 to the needle bar 5, inserting the positioning ring 7 into the needle bar 5, and assembling the stop 8 above the armature 3 connected to the needle bar 5.

[0051] Subsequently, as Figure 2B As shown, the primary welding of the positioning ring (S20) includes assembling the positioning ring 7 to contact the bottom surface of the armature 3 (S21) and performing primary laser welding on the positioning ring 7 to substantially form the lower armature lift (S22).

[0052] In other words, by fixing the stop and armature to the needle bar using the above method, and then performing the welding of the locating ring in multiple stages, the lower stroke can be set to reach the target stroke while reducing stroke dispersion. Simultaneously, by first assembling the locating ring and armature, and then performing the welding of the stop in multiple stages, the upper stroke can also be set to reach the target stroke while reducing stroke dispersion. This will... Figures 5A to 5C The description is executed again.

[0053] Reference Figure 3The positioning ring 7 includes: a ring body 7b, the diameter of which is smaller than the diameter of the ring flange 7a that forms an impact surface with the armature 3, and is fixed to the needle bar 5; and a hole to which the needle bar 5 is connected, the hole being divided into a shaft hole 7c and an expansion hole 7d, the shaft hole 7c and the expansion hole 7d being formed with cross-sectional structures having different diameters.

[0054] For example, the assembly of the needle bar 5 and the positioning ring 7 is achieved by inserting the outer diameter d0 of the needle bar into the inner diameter d1 of the first positioning ring in the shaft hole 7c, and their diameters are the same. On the other hand, since the inner diameter d2 of the second positioning ring in the expansion hole 7d forms a gap with the outer diameter d0 of the needle bar, the inner diameter d2 of the second positioning ring in the expansion hole 7d is larger than the inner diameter d1 of the first positioning ring in the shaft hole 7c, so the hole forms a stepped cross-sectional structure with different diameters.

[0055] Therefore, the position for primary laser welding of the positioning ring 7 is unconditionally determined to be below the ring body 7b of the positioning ring 7, and the upper part of the ring body 7b forming the expansion hole 7d becomes the position for secondary laser welding. Thus, compared to the primary position, the position for secondary laser welding moves upward from the positioning ring 7 towards the armature 3, as shown below. Figure 2C As shown.

[0056] In addition, the output of secondary laser welding is equal to or less than that of primary laser welding.

[0057] Reference Figure 4 The positioning ring 7 may have a rigid reinforcement structure, which consists of a ring body 7b having a ring flange 7a, a rigid body portion 7e, a fixed end portion 7f and a support portion 7g, and a shaft hole 7c having the same size as the outer diameter d0 of the needle bar 5. The outer diameter D2 of the rigid body portion 7e has a larger diameter than the outer diameter D1 of the fixed end portion 7f and the support portion 7g, thereby forming a protruding structure ring body 7b.

[0058] In other words, the diameter difference (D2-d1) between the outer diameter D2 of the rigid body portion 7e and the inner diameter d1 of the first locating ring in the shaft hole 7c is greater than the diameter difference (D1-d1) between the outer diameter D1 of the support portion 7g and the inner diameter d1 of the first locating ring in the shaft hole 7c. Even when the support portion 7g is thinner, this increased thickness prevents excessive product deformation when the secondary laser welding for precise setting of the locating ring 7 (i.e., target lift) passes through the rigid body portion 7e.

[0059] Therefore, when applying the positioning ring 7 of the rigid reinforcement structure type, primary laser welding (S22) is applied to the fixed end portion 7f, while secondary laser welding (S32) is applied to the rigid body portion 7e.

[0060] In this way, the position of the primary laser welding of the positioning ring 7 is unconditionally determined as the fixed end portion 7f, and the rigid body portion 7e or the support portion 7g becomes the position of the secondary laser welding, and thus the position of the secondary laser welding moves upward from the positioning ring 7 toward the armature 3 compared to the position of the primary laser welding.

[0061] Furthermore, the output of secondary laser welding can be equal to or less than that of primary laser welding without being increased due to the rigid body portion 7e.

[0062] Furthermore, when the radius of the positioning ring 7 increases due to the presence of the rigid body part 7e, the position of the secondary laser welding can be adjusted by the laser output and position selection in the following order of shrinkage: "primary lift (shrinkage) > secondary lift (shrinkage) > tertiary lift (shrinkage)".

[0063] Therefore, when the target lift is not reached, the welding position of the rigid body part 7e can be used as is, and the third-level welding can be performed by moving upward from the section of the rigid body part 7e or moving to the elastic deformation part, which is the support part 7g connected to the rigid body part 7e.

[0064] Refer again Figure 2B In the assembly of the positioning ring (S21), the annular flange 7a, inserted from the bottom of the needle bar 5 into the expansion hole 7d of the positioning ring 7, is positioned on the bottom surface of the armature 3. In this case, the positioning ring 7 can be connected to the needle bar 5 through a shaft hole 7c having a first positioning ring inner diameter d1 corresponding to the outer diameter d0 of the needle bar, and in particular, due to the difference in diameter, the positioning ring 7 can be fixedly press-fitted.

[0065] Furthermore, the primary laser welding (S22) of the positioning ring is performed circumferentially with the end of the ring body 7b of the positioning ring 7 as the primary welding portion 9-1, and the primary laser welding uses a laser output with a large heat input, which passes through the needle bar 5. In this case, the primary laser welding is applied only to one portion of the positioning ring 7 to allow 360° rotation, and in particular, a large amount of deformation is formed in the lower portion of the positioning ring 7 where the primary laser welding is applied.

[0066] Subsequently, after the primary laser welding is completed, the primary lift of the lower armature caused by the deformation of the positioning ring 7 is measured, and the primary lift is defined as follows.

[0067] For example, when the target lift is set to 100±5μm (95μm to 105μm), the primary weld is performed by setting the primary lift to 80μm to 100μm, and thus a maximum tolerance range of 20μm is applied.

[0068] Therefore, the primary lift is set to a tolerance range of approximately 20% of the target lift as the setting data, and the setting data allows secondary laser welding with different laser outputs to reach the target lift using a feedback setting method depending on the number of welds.

[0069] Subsequently, as Figure 2C As shown, performing secondary welding of the positioning ring (S30) includes checking the primary lift of the positioning ring (S31) and applying secondary laser welding to the positioning ring 7 so that the primary lift reaches the target lift (S32).

[0070] For example, when performing secondary laser welding immediately using data measured after primary laser welding is completed, the check on the primary lift of the positioning ring (S31) can be omitted. However, when the product is taken out and used in the inventory after primary laser welding, the tolerance range of the primary lift is remeasured to obtain setting data for different laser outputs based on the number of welds performed by secondary laser welding.

[0071] Furthermore, the secondary laser welding (S32) of the positioning ring is performed in the circumferential direction on the side opposite to the primary laser welding application portion, with the middle portion of the ring body 7b of the positioning ring 7 as the secondary welding portion 9-2, and the secondary laser welding uses a laser output with a heat input that does not pass through the needle bar 5. In this case, the positioning ring 7 is only subjected to secondary laser welding on one side to allow 360° rotation, and in particular, since the secondary laser welding has a lower heat input than the primary laser welding, the deformation of the middle portion to which the secondary laser welding is applied is less than the deformation of the primary laser welding.

[0072] For example, the number of welds and laser output in secondary laser welding are divided into tolerance ranges of approximately 20%, 15%, or 10%, based on the primary lift relative to the target lift. When the primary lift falls within the 20% tolerance range, the number of welds is set to 3; when the primary lift falls within the 15% tolerance range, the number of welds is set to 2; and when the primary lift falls within the 10% tolerance range, the number of welds is set to 1. Furthermore, as the number of welds increases, the secondary laser output is set to a smaller value.

[0073] For example, the secondary welding output based on the primary lift data is shown below.

[0074] Based on the target lift of the positioning ring 7 (100±5µm (95µm to 105µm)) of the lower armature lift, the primary setting (= primary welding output setting - welding position is the lower part of the positioning ring 7) is set to a target of 80µm to 100µm, and welding of the positioning ring 7 is performed upward toward the armature (tolerance range of 20µm). Then, when the difference between the primary setting and the primary lift is large, the secondary setting (welding output reduction, welding position upward movement, or both simultaneously) is used to reduce the amount of the secondary lift by the primary lift and compare it with the target lift.

[0075] When the secondary lift is insufficient, the laser output is reduced at the same position, or when the laser output is the same, the position is moved further upward, so that the sum of the contractions of the three lift stages is the same as the target lift.

[0076] For example, the primary lift (contraction amount) can be set to 90µm, the secondary lift (contraction amount) can be set to 85µm, and the tertiary lift (contraction amount) can be set to 80µm.

[0077] However, the number of laser welding operations on the positioning ring 7 is just an example, and the goal is to achieve the target lift by increasing the amount of shrinkage in each stage, such as "primary lift (shrinkage) > secondary lift (shrinkage) > tertiary lift (shrinkage)".

[0078] Furthermore, the position of the secondary laser welding has been described using the structure of the positioning ring 7, but this means that, apart from the position of the primary laser welding, the position of the secondary laser welding is the same as the position of the primary welding, or moves further toward the armature.

[0079] Therefore, the secondary laser welding (S32) can accurately set the target lift of the positioning ring 7 by using multiple laser welding with a small laser output. Compared with the existing fixed output, the small laser output is suitable for reducing lift dispersion with a variable laser output.

[0080] Reference Figure 5A , Figure 5B and Figure 5C The method for setting the armature lift feedback of the injector 1 includes assembling other components (S100), performing primary welding on the stop (S200), and performing secondary welding on the stop (S300), and applying the upper armature lift set by the gap (or distance) between the bottom surface of the stop 8 and the top surface of the armature 3 to the injector 1.

[0081] Therefore, the stop 8 includes a stop body 8c, an upper stop flange 8a forming the upper portion of the stop body 8c and having a diameter larger than the stop body 8c, and a lower stop flange 8b forming the lower portion of the stop body 8c and having a diameter larger than the stop body 8c. In this case, a stop flange 8b is formed having the same diameter as the stop body 8c. Figure 3 The locating ring 7 has the same structure and performs the same function as the shaft hole 7c and expansion hole 7d.

[0082] like Figure 5A As shown, the assembly of other components (S100) includes fixing the positioning ring 7 to the needle bar 5, assembling the armature 3 to the needle bar 5, and assembling the positioning ring 7 below the armature 3 connected to the needle bar 5.

[0083] like Figure 5B As shown, the primary welding of the stop (S200) includes assembling the stop 8 to contact the top surface of the armature 3 (S210) and applying primary laser welding to the stop 8 to substantially form the upper armature lift (S220).

[0084] For example, the assembly of the stop (S210) is performed such that the lower flange 8b of the stop, which is inserted from above the needle bar 5 into the expansion hole of the stop 8, is positioned on the top surface of the armature 3. In this case, the stop 8 can be connected to the needle bar 5 through the shaft hole, and can be press-fitted in a particularly fixed manner due to the difference in diameter.

[0085] Furthermore, the primary laser welding of the stop (S220) is performed in the circumferential direction with the end of the upper flange 8a of the stop 8 as the primary welding portion 9-1, and the primary laser welding uses a laser output with a large heat input, which passes through the needle bar 5. In this case, the primary laser welding is applied only to one part of the stop 8 to allow 360° rotation, and in particular, a large amount of deformation is formed in the upper part of the stop 8 where the primary laser welding is applied.

[0086] Subsequently, once the primary laser welding is completed, the primary lift of the upper armature, resulting from the deformation of the stop 8, is measured, and the primary lift is applied in conjunction with... Figure 2A , Figure 2B and Figure 2C The tolerance range is approximately 20% of the same as that described for the primary lift.

[0087] like Figure 5C As shown, performing secondary welding of the stop (S300) includes checking the primary lift of the stop (S310) and applying secondary laser welding to the stop 8 so that the primary lift reaches the target lift (S320).

[0088] For example, as in the positioning ring 7, the initial lift of the stop (S310) can be omitted, or it can be remeasured when the product is taken out and used from the inventory.

[0089] Furthermore, the secondary laser welding of the stop member (S320) is performed in the circumferential direction on the same side as the primary laser welding application portion of the stop member body 8c, using the middle portion of the stop member body 8c as the secondary welding portion 9-2, and the secondary laser welding uses a laser output with a heat input that does not pass through the needle bar 5. In this case, the stop member 8 is only subjected to secondary laser welding on one side to allow 360° rotation, and in particular, since the secondary laser welding has a lower heat input than the primary laser welding, the deformation of the middle portion to which the secondary laser welding is applied is less than the deformation of the primary laser welding.

[0090] Therefore, in the case of a stopper, similar to a locating ring, an example of secondary welding output based on primary lift data is as follows.

[0091] Based on the target lift of the upper armature (100±5µm (95µm to 105µm)), the primary setting (= primary welding output setting - welding position of the upper part of the stop 8) is set to a target of 80µm to 100µm, and welding of the stop 8 is performed downward toward the armature (tolerance range of 20µm). Then, when the difference between the primary setting and the primary lift is large, the secondary setting (welding output reduction, welding position downward movement, or both are performed simultaneously) is used to reduce the amount of the secondary lift by the primary lift and compare it with the target lift.

[0092] When the secondary lift is insufficient, the laser output is reduced at the same position, or when the laser output is the same, the position is moved further down, so that the sum of the contractions of the three lift stages is the same as the target lift.

[0093] For example, the primary lift (contraction amount) can be set to 90µm, the secondary lift (contraction amount) can be set to 85µm, and the tertiary lift (contraction amount) can be set to 80µm.

[0094] However, the number of laser welding operations for stop 8 is just an example, and the goal is to achieve the target lift by increasing the amount of shrinkage in each stage, such as "primary lift (shrinkage) > secondary lift (shrinkage) > tertiary lift (shrinkage)".

[0095] Furthermore, the position of the secondary laser welding has been described using the structure of the stop 8, but this means that, apart from the position of the primary laser welding, the position of the secondary laser welding is the same as the position of the primary welding, or moves further toward the armature.

[0096] Therefore, the secondary laser welding (S320) can accurately set the target lift of the stop 8 by using multiple laser welding with a small laser output. Compared with the existing fixed output, the small laser output is suitable for reducing lift dispersion with a variable laser output.

[0097] As described above, in the method for setting the armature lift feedback of the injector according to this embodiment, a primary lift can be formed by using the lower end portion of the positioning ring 7 or the upper end portion of the stop member 8 as the primary welding portion 9-1 and deforming the positioning ring 7 or the stop member 8 in the circumferential direction by primary laser welding. Furthermore, the target lift can be reached by performing secondary laser welding in the circumferential direction using the middle portion of the positioning ring 7 or the stop member 8 as the secondary welding portion 9-2 and the number of welding operations set according to the tolerance range of the primary lift relative to the target lift. The number of secondary laser welding operations can be adjusted according to the variable laser output, thereby accurately obtaining the armature lift dispersion relative to the positioning ring 7 or the stop member 8.

[0098] According to the method for setting the armature lift feedback of the injector disclosed herein, by reducing the armature lift dispersion, the flow distribution and behavior can be improved, and the ease of management can be enhanced.

[0099] In particular, in response to the diversification of lift specifications, variable laser output can be controlled, allowing higher output to be applied to larger lifts and lower output to smaller lifts. When a larger lift is required, the number of welds can be increased by performing multiple repeated welds. Furthermore, by ensuring that conventional processes are used as inventory and by applying new processes to set the required lift, inventory management of ejector components can be facilitated.

Claims

1. A method for controlling the armature lift feedback setting of an injector in a vehicle, the method comprising: Secure the stop to the needle bar and assemble the armature to the needle bar; By inserting the positioning ring into the needle bar, a primary welding is performed on the positioning ring to produce a primary deformation of the positioning ring and to form a primary lift relative to the target lift of the lower armature lift; as well as Perform secondary welding of the positioning ring: by setting the number of welding operations within the tolerance range of the primary lift relative to the target lift, and by setting the number of welding operations, the positioning ring undergoes secondary deformation, thereby achieving the target lift.

2. The method according to claim 1, wherein, The primary deformation of the positioning ring is achieved by primary laser welding in the circumferential direction of the positioning ring.

3. The method according to claim 2, wherein, The secondary deformation of the positioning ring is achieved by secondary laser welding in the circumferential direction of the positioning ring.

4. The method according to claim 3, wherein, The output of the primary laser welding is greater than the output of the secondary laser welding, which causes the primary deformation of the positioning ring to be greater than the secondary deformation.

5. The method according to claim 1, wherein, The primary lift generated by the primary weld will have a tolerance range set to one of 20%, 15%, or 10% of the target lift.

6. The method according to claim 5, wherein, When the tolerance range is 20%, the secondary welds aligned with the target lift decrease the lift shrinkage in sequence with at least three weld outputs to achieve the target lift.

7. The method according to claim 5, wherein, When the tolerance range is 15%, the secondary weld aligned with the target lift reduces the lift shrinkage in at least two weld output sequences to achieve the target lift.

8. The method according to claim 5, wherein, When the tolerance range is 10%, the secondary weld aligned with the target lift reduces the lift shrinkage in a weld output sequence to achieve the target lift.

9. The method according to claim 1, wherein, The positioning ring includes a ring body passing through an expansion hole, the inner diameter of which is larger than the inner diameter of the shaft hole, the shaft hole having an inner diameter corresponding to the needle bar. The inner diameter of the expansion hole forms a gap with the needle bar, thereby performing the secondary welding.

10. The method according to claim 9, wherein, The primary welding uses the lower end portion of the ring body as the primary welding portion of the positioning ring, and the secondary welding uses the middle portion of the ring body as the secondary welding portion of the positioning ring, thereby moving upward toward the armature.

11. The method according to claim 1, wherein, The positioning ring has a rigid body portion formed on the lower part of the ring body, and a shaft hole with an inner diameter corresponding to the needle bar passing through the ring body. The rigid body portion has an outer diameter larger than that of the ring body.

12. The method according to claim 11, wherein, The primary welding uses the lower end portion of the ring body as the primary welding portion of the positioning ring, and the secondary welding uses the middle portion of the rigid body portion as the secondary welding portion of the positioning ring, to move upward toward the armature, and The output of the secondary welding is equal to or less than the output of the primary welding.

13. A method for controlling the armature lift feedback setting of an injector in a vehicle, the method comprising: Secure the stop to the needle bar and assemble the armature to the needle bar; By inserting the stop into the needle bar, a primary welding is performed on the stop to produce a primary deformation of the stop, and a primary lift is formed relative to the target lift of the upper armature lift. as well as Perform secondary welding of the stop: by setting the number of welding operations within the tolerance range of the primary lift relative to the target lift, and by setting the number of welding operations, the stop undergoes secondary deformation, thereby achieving the target lift.

14. The method according to claim 13, wherein, The primary deformation of the stop is achieved by primary laser welding in the circumferential direction of the stop.

15. The method according to claim 14, wherein, The secondary deformation of the stop is achieved by secondary laser welding in the circumferential direction of the stop.

16. The method according to claim 15, wherein, The output of the primary laser welding is greater than the output of the secondary laser welding, which causes the primary deformation of the stop to be greater than the secondary deformation.

17. The method according to claim 13, wherein, The primary lift generated by the primary weld will have a tolerance range set to one of 20%, 15%, or 10% of the target lift.

18. The method of claim 13, wherein: When the tolerance range is 20%, the secondary welds aligned with the target lift decrease the lift shrinkage in sequence with at least three weld outputs to achieve the target lift. When the tolerance range is 15%, the secondary weld aligned with the target lift reduces the lift shrinkage in at least two weld outputs to achieve the target lift. as well as When the tolerance range is 10%, the secondary weld aligned with the target lift reduces the lift shrinkage in a weld output sequence to achieve the target lift.

19. The method according to claim 13, wherein, The stop member body is formed between the upper flange forming the upper part of the stop member and the lower flange forming the lower part of the stop member, and The stop body forms a gap with the needle bar through an expansion hole. The inner diameter of the expansion hole is larger than the inner diameter of the shaft hole. The shaft hole has an inner diameter corresponding to the needle bar, thereby performing the secondary laser welding.

20. The method according to claim 19, wherein, The primary welding uses the upper flange of the stop as the primary welding portion of the stop, and the secondary welding uses the body of the stop as the secondary welding portion of the stop, to move downward toward the armature.

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