METHOD FOR ANCHOR STROKE-LOAD FEEDBACK ADJUSTMENT OF AN INJECTOR

Abstract

A method for controlling the armature stroke feedback setting of an injector for a vehicle comprises a primary stroke formed by deforming a positioning ring 7 or a stopper 8 by primary laser welding in the circumferential direction, with a lower end section of the positioning ring 7 or an upper end section of the stopper 8 serving as a primary weld section. A target stroke can be achieved by secondary welding in the circumferential direction, performed by a number of welds defined according to a tolerance range of the primary stroke with respect to the target stroke, with a middle section of the positioning ring 7 or the stopper 8 serving as a secondary weld section. The method further comprises adjusting the number of welds according to a variable laser power, thereby obtaining a precise armature stroke variation with respect to the positioning ring 7 or the stopper 8.

Description

BACKGROUND(a) Technical field

[0001] The present disclosure / invention relates to a vehicle assembly and a method for manufacturing an injector (e.g., injection valve) for a vehicle, in particular a method for controlling an armature stroke feedback setting of the injector (e.g., injection valve), which may include attaching a stopper or positioning ring by welding and subsequently shrinking an insertion / introduction section. (b) Description of the state of the art

[0002] Diesel engines can incorporate a common-rail (CR) fuel injection system, in which a valve, armature, and armature pin are critical components of an injector used to influence hydraulic pressure differentials within the injector (e.g., diesel injector). Fuel injectors play a significant role in improving energy efficiency and reducing gas and particulate emissions.

[0003] Typically, the injector (e.g., a high-pressure gasoline injector for a vehicle internal combustion engine) is actuated by an electromagnet and consists of a magnetic circuit component for generating a magnetic force required for the operation of the injector and an injector behavior component, wherein a needle is lifted by an impact force of the armature generated by the magnetic force of the electromagnet.

[0004] Accordingly, an armature stroke exerted on the injector (i.e., a gap / distance between a stopper or positioning ring and the armature) is an important design factor that determines the behavior of the armature at the opening and closing times, and the armature stroke variation affects both the behavior and the flow variation.

[0005] A larger armature stroke, for example, increases the damping path, resulting in more uniform damping of the armature impulse by a fluid (e.g., a liquid), but delays the opening time. Conversely, a small armature stroke reduces the damping path, leading to poor damping of the armature impulse. This can cause rebound after impact with the positioning ring, and if multi-stage injection is used, the rebound will impair the opening behavior of the subsequent injection.

[0006] Accordingly, the armature stroke can be adjusted by weld shrinkage caused by relatively powerful laser welding after the insertion / introduction of a stopper component, thus forming an upper armature stroke using a gap / space (or distance) from the stopper to the top / upper surface of the armature, or it can be adjusted by weld shrinkage caused by relatively powerful laser welding after the insertion / introduction of a positioning ring component, forming a lower armature stroke using a gap / space (or distance) from the positioning ring to the bottom / lower surface of the armature.

[0007] However, laser welding for adjusting the armature stroke takes into account the attachment of a stopper (end stop) or positioning ring component with laser power, and excessive laser power in this process increases the scatter of the armature stroke, which significantly affects the behavior of a needle / armature and the flow rate scatter. INVENTION BRIEF

[0008] Taking into account the above points, the present disclosure / invention aims to provide a method for adjusting the armature stroke feedback of an injector for a vehicle, which can reduce the scatter according to the armature stroke setting by attaching a stopper (or stop) or a positioning ring by welding and subsequently shrinking an insertion section (or insertion section), and in particular can precisely achieve the armature stroke scatter by controlling the number of welds with a variable laser power.

[0009] According to the present disclosure / invention, a method for controlling an anchor stroke feedback setting of an injector for a vehicle comprises the following steps: attaching a stopper to a needle bar and mounting an anchor on the needle bar, performing a primary weld for a positioning ring by inserting (or introducing) the positioning ring onto (e.g. into) the needle bar, generating a primary deformation of the positioning ring and forming a primary stroke with respect to a target stroke of a lower anchor stroke, and performing a secondary weld for the positioning ring by setting a number of welds within a tolerance range of the primary stroke with respect to the target stroke and generating a secondary deformation of the positioning ring by the set number of welds, thereby achieving the target stroke.

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

[0011] According to a further aspect of the present disclosure / invention, a method for adjusting the armature stroke feedback of an injector is provided, comprising: attaching a stopper to a needle bar and mounting an armature to the needle bar, performing a primary weld for a positioning ring by inserting (or inserting) the positioning ring onto (e.g.in) the needle bar, generating a primary deformation of the positioning ring by primary laser welding in the circumferential direction for the positioning ring, and forming a primary stroke with respect to a target stroke of a lower armature stroke, and performing a secondary welding for the positioning ring by setting the number of welds within a tolerance range of the primary stroke with respect to the target stroke and generating a secondary deformation of the positioning ring by secondary laser welding in the circumferential direction for the positioning ring by the set number of welds, thereby achieving the target stroke. The power of the primary laser welding is greater than that of the secondary laser welding, so that the primary deformation of the positioning ring is greater than the secondary deformation.

[0012] If the tolerance range is 20%, the secondary laser welding aligned with the target stroke reduces the amount of stroke shrinkage sequentially with at least three welding powers / welding power outputs to achieve the target stroke; if the tolerance range is 15%, the secondary laser welding aligned with the target stroke reduces the amount of stroke shrinkage sequentially with at least two welding powers / welding power outputs to achieve the target stroke; and if the tolerance range is 10%, the secondary laser welding aligned with the target stroke (e.g., sequentially) reduces the amount of stroke shrinkage with (e.g., exactly) one welding power / welding power output to achieve the target stroke.

[0013] Primary laser welding uses a lower end section of the ring body as the primary welding section of the positioning ring, and secondary laser welding uses a middle section of the ring body as the secondary welding section of the positioning ring, causing it to move upwards towards the anchor.The positioning ring has a rigid body formed on a lower section of an annular body section through which a shaft hole with an inner diameter corresponding to a needle bar passes, the rigid body section having a larger outer diameter than the annular body, the primary laser welding (primary laser welding) using a lower end section of the annular body as the primary weld section of the positioning ring, the secondary laser welding using a middle section of the rigid body section or a support section as the secondary weld section of the positioning ring to move upwards towards the anchor, and the power of the secondary laser welding being equal to or less than that of the primary laser welding.According to the present disclosure / invention, a method for controlling an armature stroke feedback setting of an injector for a vehicle comprises the following steps: attaching a stopper to a needle bar and mounting an armature to the needle bar, performing a primary weld for a stopper by inserting / inserting the stopper into the needle bar, generating a primary deformation of the stopper and forming a primary stroke with respect to a target stroke of an upper armature stroke, and performing a secondary weld for the stopper by setting a number of welds within a tolerance range of the primary stroke with respect to the target stroke and generating a secondary deformation of the stopper by the set number of welds, thereby achieving the target stroke.

[0014] Furthermore, the primary deformation of the stopper can be achieved by primary laser welding in the circumferential direction. Secondary deformation of the stopper can also be achieved by secondary laser welding in the circumferential direction.

[0015] According to a further aspect of the present disclosure / invention, a method for adjusting the armature stroke feedback of an injector is provided, comprising: attaching a stopper to a needle bar and mounting an armature to the needle bar, performing a primary weld for a stopper by inserting / inserting the stopper onto (e.g. into) the needle bar, generating a primary deformation of the stopper by a primary laser weld in the circumferential direction for the stopper and forming a primary stroke with respect to a target stroke of an upper armature stroke, and performing a secondary weld for the stopper by setting the number of welds within a tolerance range of the primary stroke with respect to the target stroke and generating a secondary deformation of the stopper by a secondary laser weld in the circumferential direction for the stopper through the set number of welds, thereby achieving the target stroke.

[0016] The power / output power of the primary laser welding is greater than that of the secondary laser welding, so the primary deformation of the positioning ring is greater than the secondary deformation.

[0017] If the tolerance range is 20%, the secondary laser welding, which is aligned to the target stroke, sequentially reduces the amount of stroke shrinkage with at least three welding powers to achieve the target stroke; if the tolerance range is 15%, the secondary laser welding, aligned to the target stroke, sequentially reduces the amount of stroke shrinkage with at least two welding powers to achieve the target stroke; and if the tolerance range is 10%, the secondary laser welding, aligned to the target stroke (e.g., sequentially), reduces the amount of stroke shrinkage with one (e.g., exactly one) welding power to achieve the target stroke.The stopper forms a stopper body between an upper stopper flange, which forms an upper section, and a lower stopper flange, which forms a lower section, wherein the stopper body forms a gap (e.g., radial gap) with the needle bar through an expansion hole with a larger inner diameter than a shaft hole whose inner diameter corresponds to that of the needle bar, whereby the secondary laser welding is carried out, wherein the primary laser welding uses the upper flange of the stopper as a primary welding section of the stopper, and wherein the secondary laser welding uses the stopper body as a secondary welding section of the stopper to move downwards towards the armature. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows an example of an injector to which an armature stroke feedback setting is applied according to the present disclosure / invention. Fig. 2A, Fig. 2B and Fig. Figure 2C shows an example of a method for adjusting the armature stroke feedback of an injector forming a lower armature stroke (i.e., a positioning ring side) of an injector according to the present disclosure / invention. Fig. Figure 3 shows an example of a rigid deformation structure of a positioning ring. Fig. Figure 4 shows an example of a rigid deformation structure of a positioning ring according to the present disclosure / invention. Fig. 5A, Fig. 5B and Fig. Figure 5C illustrates an example of a method for adjusting the armature stroke feedback of an injector forming an upper armature stroke (i.e., a stopper side) of an injector according to the present disclosure / invention. DETAILED DESCRIPTION

[0018] It is understood that the term "vehicle" or "vehicle-related" or other similar terms as used herein include motor vehicles in general, such as passenger cars including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft and the like, and hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen vehicles and other vehicles powered by alternative fuels (e.g., fuels derived from resources other than petroleum). As mentioned herein, a hybrid vehicle is a vehicle that has two or more sources of propulsion, for example, both gasoline-powered and electric vehicles.

[0019] The terminology used herein serves only to describe certain embodiments and is not intended to limit the present disclosure / invention. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It is further understood that the terms "indicates" and / or "indicating," when used in this description, specify the presence of the indicated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes all combinations of one or more of the listed elements.Unless explicitly stated otherwise, throughout this description the word "include / include" and variations such as "indicates / includes" or "indicating / comprehensive" are to be understood as implying the presence of the specified elements, but not excluding the absence of other elements. Furthermore, the terms "unit," "-er," "-ar," and "module" used in this description refer to units for processing at least one function and operation, which may be implemented by hardware components or software components and combinations thereof.

[0020] Furthermore, the control logic of the present disclosure / invention can be embodied as a non-transitory computer-readable medium on a computer-readable medium containing executable program instructions that are executed by a processor, a control device, or the like. Examples of computer-readable media include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards, and optical data storage devices. The computer-readable medium can also be distributed in network-connected computer systems, 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).

[0021] In the following, embodiments of the present disclosure / invention are described in detail with reference to the accompanying drawings, these embodiments being examples and which can be implemented in various forms by those skilled in the field of the present disclosure / invention and are therefore not limited to the embodiments disclosed herein.

[0022] With reference to Fig. 1 comprises an injector 1, a magnetic circuit unit 1a, and an injector actuation unit 1b. The magnetic circuit unit 1a comprises an armature 3 together with a magnetic core / solenoid coil. The injector actuation unit 1b comprises a stopper 8 together with a needle bar 5 and a positioning ring 7 and is connected to a ball valve seat, which is opened and closed by the needle bar 5.

[0023] Accordingly, injector 1 is an electromagnet-actuated injector, and along with the lifting of the armature 3, a needle (i.e., the needle bar 5) is lifted by a "magnetic force + armature impact force," and the needle and armature move downwards simultaneously at a closing point when a current signal is stopped, so that the needle and armature return sequentially. For this purpose, the armature 3 is moved upwards by a magnetic force generated by the magnet armature / solenoid coil, absorbs an impact force that arises when the armature 3 moves upwards along with the magnetic force, and transmits the magnetic force to the stopper 8, which opens an injector valve. The needle bar 5 opens the injector valve through the ball of the valve seat as the armature 3 moves upwards.The positioning ring 7 forms an anchor positioning ring impact surface at a closing time of the injector valve and thereby controls the behavior of the anchor 3.

[0024] An anchor stroke of the injector 1 is defined as a stroke determined by a gap (or distance) between the underside of the stopper 8 and the top of the anchor 3, and is referred to as the upper stroke. Furthermore, a stroke determined by a gap (or distance) between the top of the positioning ring 7 and the underside of the anchor 3 is referred to as the lower stroke.

[0025] This means that the anchor stroke of the anchor becomes the upper stroke if the stopper is attached first and then the stroke is adjusted according to the welding of the positioning ring, and becomes the lower stroke if the positioning ring is attached first and then the stroke is adjusted according to the welding of the stopper.

[0026] First, a method for forming the upper stroke is described.

[0027] The anchor stroke is determined by the position of the positioning ring 7 after the needle bar 5, the stopper 8 and the anchor 3 have been assembled and the positioning ring 7 has been attached to the needle bar 5 by welding.

[0028] During cooling after welding, the positioning ring 7 shrinks, which changes the stroke between the positioning ring 7 and the bottom of the armature 3, and if the heat input increases due to an increase in welding power / welding output power, the deformation variation increases, leading to an increase in stroke variation.

[0029] Accordingly, in the present disclosure / invention, the welding is not completed by a single initial welding with a large heat input, but instead the total heat input and the number of welds are divided.

[0030] This means that a primary weld is performed with a primary heat input, followed by a secondary weld with a secondary heat input. Finally, to reduce heat input and dispersion, the primary weld is performed, and then secondary and tertiary welds are performed as needed. The welding process is carried out from the underside of the positioning ring 7 towards its top, i.e., towards the underside of the anchor, thereby reducing stroke dispersion and achieving a target stroke. For this purpose, during a N ten Welding or of an N ten Welding is performed as a primary laser welding process, in which a large heat input is applied circumferentially through the needle bar 5 to form a primary stroke with large deformation scatter.

[0031] Subsequently, a secondary laser welding process is carried out as a two-stage laser welding process, in which a laser power determined on the basis of setting data / setting values ​​of the primary stroke is applied in the circumferential direction without passing through the needle bar 5, thereby achieving the target stroke.

[0032] Accordingly, the increase in stroke during secondary laser welding is lower compared to primary laser welding, and the power of secondary welding is equal to or less than that of primary welding.

[0033] The heat input without passing through the needle bar 5 means that, in contrast to the laser power used for direct welding in the first step, from the second step the laser is emitted from the outside (off) and thus the welding heat is transferred through the positioning ring 7, but is prevented from influencing a welding surface through the needle bar 5.

[0034] Accordingly, primary welding refers to the welding process in which the power of the primary laser fixes the positioning ring 7 or the stopper 8 to the needle bar 5, while secondary welding refers to the process in which the power of the secondary laser does not fix the positioning ring 7 or the stopper 8 to the needle bar 5, but partially melts the positioning ring 7 or the stopper 8 and then only shrinkage occurs due to cooling.

[0035] As defined above for secondary welding, it should be understood that "secondary welding" or "secondary laser welding" refers below to the shrinkage caused by the partial melting and subsequent cooling of the positioning ring 7 or the stopper 8, and not to the attachment of the positioning ring 7 or the stopper 8 to the needle bar 5. Specifically, secondary laser welding is performed using a feedback adjustment procedure in which a laser power with varying heat input is used for each weld. This power is determined based on the difference between the primary stroke and the target stroke, thereby achieving the target stroke and minimizing stroke variation after completion of the primary and secondary welding processes.

[0036] Furthermore, with the exception of the primary weld among multiple welds, the welding positions from the secondary weld onwards are either the same or shifted towards the anchor 3. In this case, the shift of the welding position is the same at / near the positioning ring 7 or at / near the stopper / stop 8.

[0037] With reference to the Fig. 2A, Fig. 2B and Fig. 2C comprises the procedure for adjusting the armature stroke feedback of an injector 1, the assembly / mounting of other components (S10), the performance of a primary weld for a positioning ring (S20), the performance of a secondary weld for the positioning ring (S30), and the lower armature stroke, which is determined by the gap (or distance) between the top of the positioning ring 7 and the bottom of the armature 3, is applied to the injector 1.

[0038] As in Fig. As shown in Figure 2A, the assembly / mounting of other components (S10) includes attaching the stopper / end stop 8 to the needle bar 5, assembling / mounting the anchor 3 with / on the needle bar 5, inserting / placing the positioning ring 7 onto (e.g. into) the needle bar 5 (or inserting / placing the needle bar into the positioning ring 7 or placing / sliding the positioning ring 7 onto the needle bar 5), and assembling / mounting the stopper / end stop 8 over the anchor 3 connected to the needle bar 5.

[0039] The subsequent process involves performing the primary welding for the positioning ring (S20), as described in Fig. 2B shows the mounting of the positioning ring 7 so that it comes into contact with the underside of the anchor 3 (S21), and the application of a primary laser welding to the positioning ring 7 so that the lower anchor stroke is roughly formed (S22).

[0040] This means that by attaching the stop and anchor to the needle bar using the method described above, and subsequently welding the positioning ring in several stages, it is possible to adjust the lower stroke to achieve the target stroke while simultaneously reducing stroke variation. By first mounting the positioning ring and anchor and then welding the stop in several stages, it is also possible to adjust the upper stroke to achieve the target stroke while simultaneously reducing stroke variation, which in Fig. 4 is described again.

[0041] With reference to Fig. The positioning ring 7 comprises a ring body 7b, which has a smaller diameter than a ring flange 7a, forming an impact surface with the anchor 3 and attached to the needle bar 5. A hole to which the needle bar 5 is connected is divided into an axial hole / shaft hole 7c and an expansion hole 7d, which are designed to have a cross-sectional structure with different diameters. For example, the assembly of the needle bar 5 and the positioning ring 7 is achieved by fitting a needle bar outer diameter d0 onto (e.g., into) a first positioning ring inner diameter d1 of the shaft hole 7c, their diameters being equal.Since, on the other hand, a secondary positioning ring inner diameter d2 in the expansion hole 7d is designed such that it has a gap to the needle bar outer diameter d0, the second positioning ring inner diameter d2 in the expansion hole 7d is larger than the first positioning ring inner diameter d1 in the shaft hole 7c, and thus the hole is designed with a stepped cross-sectional structure with different diameters.

[0042] Accordingly, the position of the primary laser weld for the positioning ring 7 is unconditionally fixed below the ring body 7b of the positioning ring 7, and an upper section of the ring body 7b, which forms the expansion hole 7d, becomes the position of the secondary laser weld, and thus the position of the secondary laser weld is shifted upwards from the positioning ring 7 towards the anchor 3 compared to the primary position, as shown in Fig. 2C shown.

[0043] Furthermore, the performance of secondary laser welding is equal to or less than that of primary laser welding.

[0044] With reference to Fig. 4. The positioning ring 7 can have a rigid reinforcement structure, wherein the rigid reinforcement structure is formed from the ring body 7b with a ring flange structure 7a, a rigid body section 7e, a fixed end section 7f and a support section 7g, and a shaft hole 7c which has the same size as the outer diameter d0 of the needle bar 5, wherein an outer diameter D2 of the rigid body section 7e is a larger diameter than the outer diameters D1 of the fixed end section 7f and the support section 7g, whereby the ring body 7b is formed in a projecting structure (as a ring collar).

[0045] This means that the outer diameter D2 of the rigid body section 7e is thicker than the difference in diameters (D1-d1) between the outer diameter D1 of the support section 7g and the inner diameter d1 of the first positioning ring in the shaft hole 7c. This increased thickness prevents excessive product deformation, even when the secondary laser welding of the precision adjustment (i.e., the target stroke) for the positioning ring 7 passes through the rigid body section 7e, as would be the case with a thin support section 7g.

[0046] Accordingly, when using a positioning ring 7 of the rigid reinforcement structure type, the primary laser welding (S22) is performed at the fixed end section 7f and the secondary laser welding (S32) is performed at the rigid body section 7e. In this way, the position of the primary laser welding for the positioning ring 7 is unconditionally fixed as the fixed end section 7f, and the rigid body section 7e or the support section 7g becomes the position of the secondary laser welding, thus shifting / displacing the position of the secondary laser welding upwards from the positioning ring 7 in the direction of the anchor 3 compared to the position of the primary laser welding.

[0047] Furthermore, the power of the secondary laser welding can be equal to or less than that of the primary laser welding without any increase due to the rigid body section 7e.

[0048] If the radius of the positioning ring 7 increases due to the presence of the rigid body section 7e, the position of the secondary laser weld can adjust the amount of shrinkage in the following sequence: "Primary stroke (shrinkage amount) > Secondary stroke (shrinkage amount) > Tertiary stroke (shrinkage amount)" by selecting the laser power and position. If the target stroke is not reached, the welding position of the rigid body section 7e can remain unchanged, and a tertiary weld can be performed by moving upwards from the section of the rigid body section 7e or by moving to an elastic deformation section, which is the support section 7g connected to the rigid body section 7e.

[0049] Referring to Fig. 2B, during the assembly of the positioning ring (S21), the ring flange 7a, which is inserted / fed (e.g., pushed / placed) onto the needle bar 5 from the underside of the needle bar 5 via the expansion hole 7d of the positioning ring 7, is positioned on / at the underside of the anchor 3. In this case, the positioning ring 7 can be coupled to the needle bar 5 via the shaft hole 7c, which has the first positioning ring inner diameter d1 corresponding to the needle bar outer diameter d0, and, in particular, can be pressed / pressed firmly onto it due to the difference in diameter.

[0050] Furthermore, primary laser welding (S22) is performed circumferentially on the positioning ring with an end section of the ring body 7b of the positioning ring 7 as a primary welding section 9-1, and the primary laser welding uses a laser power with a high heat input passing through the needle bar 5. In this case, the primary laser welding is applied only to a part / section of the positioning ring 7 to allow 360° rotation, and in particular, a large deformation is formed in the lower section of the positioning ring 7 to which the primary laser welding was applied.

[0051] Subsequently, after the primary laser welding is complete, the positioning ring 7 measures a primary stroke of the lower armature stroke formed due to deformation, and the primary stroke is defined as follows. For example, if the target stroke is set to 100 ± 5 µm (95 to 105 µm), the primary welding is performed by setting the primary stroke to 80 to 100 µm, thus applying a maximum tolerance range of 20 µm. Accordingly, the primary stroke is set as a setting value / setting data to a tolerance range of approximately 20% of the target stroke, and the setting value / setting data allows the secondary laser welding, which uses different laser powers depending on the number of welds, to achieve the target stroke using a feedback adjustment procedure.

[0052] The subsequent secondary welding (S30) for the positioning ring is carried out as described in Fig. 2C shows the checking of the primary stroke for the positioning ring (S31) and the application of secondary laser welding to the positioning ring 7 so that the primary stroke reaches the target stroke (S32).

[0053] For example, the primary stroke check for the positioning ring (S31) can be omitted if the secondary laser welding is performed immediately using values / data measured after completion of the primary laser welding. However, if a product stored in the warehouse after primary laser welding is removed and used, the tolerance range of the primary stroke is measured again to obtain setting data / values ​​that determine / specify different laser powers according to the number of welds performed in the secondary laser welding process.

[0054] Furthermore, secondary laser welding (S32) for the positioning ring is performed circumferentially with a central section of the ring body 7b of the positioning ring 7 as a secondary welding section 9-2 on one side opposite the primary laser welding section 9-1, and the secondary laser welding uses a laser power with a heat input that does not pass through the needle bar 5. In this case, the positioning ring 7 is subjected to secondary laser welding only on one side to allow 360° rotation, and in particular because the secondary laser welding has a lower heat input than the primary laser welding, the deformation of the central section to which the secondary laser welding was applied is less than that of the primary laser welding.

[0055] For example, the number of welds and the laser power of the secondary laser welding are categorized into tolerance ranges of approximately 20%, 15%, or 10% based on the primary setting result of the primary stroke relative to the target stroke. The number of welds is set to three if the primary setting result is within the 20% tolerance range, to two if the primary setting result is within the 15% tolerance range, and to one if the primary setting result is within the 10% tolerance range. As the number of welds increases, the secondary laser power is reduced.

[0056] An example of secondary welding performance based on primary stroke data is as follows. Based on the target stroke (100 ± 5 µm (95 to 105 µm)) for the positioning ring 7 of the lower armature stroke, the primary setting (= primary welding performance setting - welding position is a lower end section of the positioning ring 7) is set to a target value of 80 to 100 µm. Welding of the positioning ring 7 (tolerance range of 20 µm) is performed upwards towards the armature. If there is a significant difference between this and the primary stroke according to the primary setting, the secondary setting (reducing the welding performance, moving the welding position upwards, or both simultaneously) is used to reduce the primary stroke by the amount of the secondary stroke and compare it to the target stroke.

[0057] If the secondary stroke is insufficient, the laser power at the same position is reduced, or if the laser power remains the same, the position is moved further upwards so that the sum of the shrinkage up to the tertiary stroke equals the target stroke.

[0058] For example, the primary stroke (shrinkage amount) may be a case where the first adjustment result is 90 µm, the secondary stroke (shrinkage amount) may be a case where the primary adjustment result is 85 µm, and the tertiary stroke (shrinkage amount) may be a case where the primary adjustment result is 80 µm.

[0059] However, the number of laser welds for the positioning ring 7 is only an example, and the goal is to achieve the target stroke by adding the shrinkage amounts at each stage, for example, "Primary stroke (shrinkage amount) > Secondary stroke (shrinkage amount) > Tertiary stroke (shrinkage amount)".

[0060] Furthermore, the position of the secondary laser weld was described based on the structure of the positioning ring 7, which, however, means that the position of the secondary laser weld, with the exception of the position of the primary laser weld, is the same as the position of the primary weld or is moved further towards the armature.

[0061] Accordingly, secondary laser welding (S32) enables precise adjustment of the target stroke of the positioning ring 7 by means of multiple laser welds using a low laser power, which is suitable for reducing stroke scatter with a variable laser power compared to the existing fixed laser power.

[0062] With reference to the Fig. 5A, Fig. 5B and Fig. 5C comprises the method for adjusting the armature stroke feedback of the injector 1, the assembly / mounting of other components (S100), the performance of a primary welding for a stopper (S200) and the performance of a secondary welding for the stopper (S300), wherein the upper armature stroke set by the gap (or the distance / space) between a bottom of the stopper 8 and a top of the armature 3 is applied to the injector 1.

[0063] For this purpose, the stopper 8 comprises a stopper body 8c, an upper stopper flange 8a, which forms an upper section of the stopper body 8c with a larger diameter than the body, and a lower stopper flange 8b, which forms a lower section of the stopper body 8c with a larger diameter than the body. In this case, a shaft hole and an expansion hole are formed, which have the same structure and function as the shaft hole 7c and the expansion hole 7d of the positioning ring 7 in Fig. 3 have.

[0064] As in Fig. As shown in Figure 5A, the assembly / mounting of other components (S100) includes attaching the positioning ring 7 to the needle bar 5, assembling / mounting the anchor 3 with / on the needle bar 5, and assembling / mounting the positioning ring 7 below the anchor 3 connected to the needle bar 5.

[0065] As in Fig. As shown in 5B, performing the primary welding for the stopper (S200) includes mounting the stopper 8 so that it comes into contact with the top of the armature 3 (S210), and applying a primary laser welding to the stopper 8 so that the upper armature stroke is roughly formed (S220).

[0066] For example, the stopper (S210) is mounted such that a lower flange 8b of the stopper, which is inserted from above the needle bar 5 with an expansion hole of the stopper 8 (e.g., pushed onto the needle bar 5), is positioned on / at the top of the armature 3. In this case, the stopper 8 can be connected to the needle bar 5 through the shaft hole and can be pressed on tightly, particularly due to a difference in diameter. Furthermore, primary laser welding (S220) of the stopper is carried out circumferentially with an end section of the upper flange 8a of the stopper 8 as the primary weld section 9-1, and the primary laser welding uses a laser power with a high heat input that passes through the needle bar 5.In this case, primary laser welding is applied only to a part / section of the stopper 8 to allow 360° rotation, and in particular, a large deformation is formed in the lower section of the stopper 8 to which the primary laser welding was applied.

[0067] Subsequently, once the primary laser welding is complete, the primary stroke of the upper armature stroke, formed due to the deformation of stopper 8, is measured, and the primary stroke applies the same tolerance range of approximately 20% as that for the primary stroke used in the Fig. 2A, Fig. 2B and Fig. 2C is described.

[0068] The execution of the secondary welding (S300) for the stopper, as in Fig. 5C shows the verification of the primary stroke for the stopper (S310) and the application of the secondary laser welding to the stopper 8 so that the primary stroke reaches the target stroke (S320).

[0069] For example, the primary stroke check for the stopper (S310) can be omitted or remeasured, as with the positioning ring 7, when a product stored in the warehouse is removed and used.

[0070] Furthermore, secondary laser welding (S320) for the stopper is performed circumferentially with a central section of the stopper body 8c as the secondary welding section 9-2 on the same (e.g., opposite) side as the primary laser welding section of the stopper body 8c of the stopper 8, and the secondary laser welding uses a laser power with a heat input that does not pass through the needle bar 5. In this case, the stopper 8 is subjected to secondary laser welding only on one side to allow 360° rotation, and in particular because the secondary laser welding has a lower heat input than the primary laser welding, the deformation of the central section to which the secondary laser welding was applied is less than that of the primary laser welding.Accordingly, in the case of the stopper, as with the positioning ring, an example of the secondary welding performance based on the primary stroke data is as follows. Based on the target stroke (100 ± 5 µm (95 to 105 µm)) of the upper armature stroke, the primary setting (= primary welding performance setting - welding position is an upper end section of the stopper 8) is set to a target value of 80 to 100 µm, and the welding of the stopper 8 (tolerance range of 20 µm) is performed downwards from the armature. If there is then a large difference to the primary stroke according to the primary setting, the secondary setting (the welding performance is reduced, the welding position is moved downwards, or both are performed simultaneously) is used to decrease / shrink the primary stroke by the amount of the secondary stroke and compare it to the target stroke.If the secondary stroke is insufficient, the laser power is reduced at the same position, or if the laser power remains the same, the position is moved further downwards so that the sum of the reduction / shrinkage up to the tertiary stroke equals the target stroke.

[0071] For example, the primary stroke (shrinkage amount) may be a case where the first setting result is 90 µm, the secondary stroke (shrinkage amount) may be a case where the primary setting result is 85 µm, and the tertiary stroke (shrinkage amount) may be a case where the primary setting result is 80 µm.

[0072] However, the number of laser welds for the stopper 8 is just an example, and the goal is to achieve the target stroke by adding the shrinkage amounts at each stage, for example, "Primary stroke (shrinkage amount) > Secondary stroke (shrinkage amount) > Tertiary stroke (shrinkage amount)".

[0073] Furthermore, the position of the secondary laser weld was described based on the structure of the stopper 8, which means, however, that the position of the secondary laser weld, with the exception of the position of the primary laser weld, is the same as the position of the primary weld or is shifted / displaced further towards the anchor.

[0074] Accordingly, secondary laser welding (S320) enables precise adjustment of the target stroke of the stopper 8 by means of multiple laser welds using a low laser power, which is suitable for reducing stroke variation with variable laser power compared to the existing fixed power. As described above, in the method for armature stroke feedback adjustment of an injector according to the present embodiment, the primary stroke can be formed by deforming the positioning ring 7 or the stopper 8 by primary circumferential laser welding with the lower end section of the positioning ring 7 or the upper end section of the stopper 8 as the first weld section 9-1, and the target stroke can be achieved by secondary circumferential laser welding, which is carried out by the number of welds.which is set according to the tolerance range of the primary stroke with respect to the target stroke with the middle section of the positioning ring 7 or the stopper / stop 8 as the secondary welding section 9-2, whereby the number of secondary laser welds and the number of welds are adjusted according to the variable laser power, thereby precisely achieving / maintaining the anchor stroke scatter with respect to the positioning ring 7 or the stopper 8.

[0075] According to the method for adjusting the armature stroke feedback of an injector of the present disclosure / invention, it is possible to improve the flow distribution and behavior and to simplify handling by reducing the armature stroke scatter.

[0076] In particular, in response to the diversification of stroke specifications, the variable laser power can be controlled so that higher power is applied for a larger stroke and lower power for a smaller stroke when a larger stroke is required; the number of welds can be increased by performing multiple welds; and by ensuring a state in which conventional methods are applied as the standard and setting the required stroke by applying a new method, the inventory management of the injector component can be facilitated.

Claims

[1] Method for controlling an armature lift feedback setting of an injector for a vehicle, the method comprising: Attaching a stopper (8) to a needle bar (5) and mounting an anchor (3) on the needle bar (5), Performing a primary weld for a positioning ring (7) by inserting the positioning ring onto the needle bar (5), generating a primary deformation of the positioning ring (7) and forming a primary stroke with respect to a target stroke of a lower anchor stroke, and Performing a secondary welding process for the positioning ring (7) by setting a number of welds within a tolerance range of the primary stroke with respect to the target stroke and generating a secondary deformation of the positioning ring (7) by the set number of welds, thereby achieving the target stroke. [2] Method according to claim 1, wherein the primary deformation of the positioning ring (7) is achieved by primary laser welding in the circumferential direction for the positioning ring. [3] Method according to claim 1 or 2, wherein the secondary deformation of the positioning ring (7) is achieved by a secondary laser welding in the circumferential direction for the positioning ring (7). [4] Method according to claim 3, wherein the power of the primary laser welding is greater than that of the secondary laser welding, so that the primary deformation of the positioning ring (7) is greater than the secondary deformation. [5] Method according to any one of claims 1-4, wherein the primary stroke produced by the primary welding defines a tolerance range of 20%, 15% or 10% of the target stroke. [6] Method according to claim 5, wherein, if the tolerance range is 20%, the secondary welding aligned with the target stroke sequentially reduces the amount of stroke shrinkage with at least three welding operations to achieve the target stroke. [7] Method according to claim 5 or 6, wherein, if the tolerance range is 15%, the secondary welding aligned with the target stroke sequentially reduces the amount of stroke shrinkage with at least two welding operations to achieve the target stroke. [8] Method according to any one of claims 5-7, wherein, when the tolerance range is 10%, the secondary welding aligned with the target stroke sequentially reduces the amount of stroke shrinkage with exactly one welding power to achieve the target stroke. [9] Method according to any one of claims 1-8, wherein the positioning ring (7) comprises: a ring body (7b) through which an expansion hole (7d) with a larger inner diameter (d2) than a shaft hole (7c) with an inner diameter (d1) corresponding to the needle bar (5) passes, wherein The inner diameter (d2) of the expansion hole (7d) forms a gap with the needle bar (5), through which the secondary welding is carried out. [10] Method according to claim 9, wherein the positions of the primary weld and the secondary weld are shifted from the position of the secondary weld to a position in the direction of the anchor (3), excluding the position of the primary weld. [11] Method according to any one of claims 1-8, wherein the positioning ring (7) has a rigid body section (7e) formed on a lower section of an annular body section (7b) through which a shaft hole (7c) with an inner diameter (d1) corresponding to a needle bar (5) passes, wherein the rigid body section (7e) has a larger outer diameter (D2) than the annular body section (7b). [12] Method according to any one of claims 1-11, wherein the positions of the primary weld and the secondary weld are shifted from the position of the secondary weld towards the anchor (3), except for the position of the primary weld, and the power of the secondary weld is equal to or less than that of the primary weld. [13] Method for controlling an armature lift feedback setting of an injector for a vehicle, the method comprising: Attaching a stopper (8) to a needle bar (5) and mounting an anchor (3) on the needle bar (5), Performing a primary weld for a stopper (8) by inserting the stopper (8) onto the needle bar (5), generating a primary deformation of the stopper (8) and forming a primary stroke with respect to a target stroke of an upper anchor stroke, and Performing a secondary welding operation for the stopper (8) by setting a number of welds within a tolerance range of the primary stroke with respect to the target stroke and generating a secondary deformation of the stopper (8) by the set number of welds, thereby achieving the target stroke. [14] Method according to claim 13, wherein the primary deformation of the stopper (8) is achieved by primary laser welding in the circumferential direction for the stopper (8). [15] Method according to claim 13 or 14, wherein the secondary deformation of the stopper (8) is achieved by secondary laser welding in the circumferential direction for the stopper (8). [16] Method according to one of claims 13-15, wherein the power of the primary laser welding is greater than that of the secondary laser welding, so that the primary deformation of the stopper (8) is greater than the secondary deformation. [17] Method according to one of claims 13-16, wherein the primary stroke produced by the primary welding defines a tolerance range of 20%, 15% or 10% of the target stroke. [18] Method according to any one of claims 13-17, wherein: if the tolerance range is 20%, the secondary weld aligned with the target stroke sequentially reduces the amount of stroke shrinkage with at least three welding passes to achieve the target stroke, and if the tolerance range is 15%, the secondary weld aligned with the target stroke sequentially reduces the amount of stroke shrinkage with at least two welding passes to achieve the target stroke, and If the tolerance range is 10%, the secondary weld aligned with the target stroke sequentially reduces the amount of stroke shrinkage with exactly one welding power to achieve the target stroke. [19] Method according to any one of claims 11-18, wherein the stopper (8) forms a stopper body (8c) between an upper stopper flange (8a) forming an upper section and a lower stopper flange (8b) forming a lower section, and wherein The stopper body (8c) forms a gap with the needle bar (5) through an expansion hole (7d) with a larger inner diameter (d2) than a shaft hole (7c) with an inner diameter (d1) corresponding to that of the needle bar (5), thereby carrying out the secondary laser welding. [20] Method according to claim 19, wherein the positions of the primary laser welding and the secondary laser welding are shifted from the position of the secondary laser welding to a position in the direction of the anchor (3), excluding the position of the primary laser welding.

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