CN108699990B - Method for determining an air gap of a solenoid injector - Google Patents

Method for determining an air gap of a solenoid injector Download PDF

Info

Publication number
CN108699990B
CN108699990B CN201780013922.8A CN201780013922A CN108699990B CN 108699990 B CN108699990 B CN 108699990B CN 201780013922 A CN201780013922 A CN 201780013922A CN 108699990 B CN108699990 B CN 108699990B
Authority
CN
China
Prior art keywords
air gap
magnetic armature
stroke
current
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201780013922.8A
Other languages
Chinese (zh)
Other versions
CN108699990A (en
Inventor
S.武尔斯特霍恩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of CN108699990A publication Critical patent/CN108699990A/en
Application granted granted Critical
Publication of CN108699990B publication Critical patent/CN108699990B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • F02M51/0657—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve the body being hollow and its interior communicating with the fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Abstract

The invention relates to a method for determining solenoid injectionAir gap (Delta L) of magnetic armature (252) of machine (200)A) The method according to (1), the solenoid injector having an electromagnet (253) which has a coil (254) and by energizing the coil the magnetic armature (252) can be raised, wherein the air gap, which specifies the distance between the electromagnet (253) and the magnetic armature (252), is determined taking into account the course of the current change in the coil (254) during the energization of the coil (254).

Description

Method for determining an air gap of a solenoid injector
The invention relates to a method for determining an air gap of a solenoid injector, to a computing unit and to a computer program for the execution thereof.
Background
Internal combustion engines in motor vehicles can have a high-pressure accumulator, a so-called common rail, in which the fuel is exposed to a high pressure (for example up to 3000 bar). From this high-pressure accumulator, the fuel can then be introduced directly into the combustion chamber of the internal combustion engine via the individual fuel injectors, which are connected to the high-pressure accumulator.
As fuel injectors, for example, solenoid injectors can be used, in which a valve needle is moved to release an injection opening by actuating a coil or an electromagnet or by energizing a coil or an electromagnet.
So-called directly switched solenoid valve injectors are known, for example, from DE 102010041109 a1 and DE 102013212138 a 1. The valve needle is moved directly by means of a magnetic armature which is part of the electromagnetic actuator and is moved by energizing a coil.
Disclosure of Invention
According to the invention, a method for determining an air gap of a magnet armature, in particular an initial air gap, which specifies the distance between the electromagnet and the magnet armature when the magnet armature is not lifted, and/or a residual air gap, which specifies the distance between the electromagnet and the magnet armature when the magnet armature is lifted to abut a stop means (for example an adjusting disk or an adjusting ring), is proposed, as well as a computer program for the execution thereof. Advantageous embodiments are the subject matter of the dependent claims and the following description.
The method according to the invention is used to determine the air gap, in particular the initial air gap and/or the residual air gap, of the magnetic armature of an electromagnet by specifically energizing the coil. The air gap is determined here taking into account the course of the current in the coil during the energization of the coil. Then, in particular, the stroke of the magnetic armature can be determined taking into account the initial air gap and the residual air gap. To this end, it should be noted that the stroke of the magnetic armature preferably corresponds to the difference between the initial air gap and the residual air gap.
The proposed method here makes use of the fact that: the air gap in the electromagnetic actuator of the solenoid valve (i.e. the air gap between the magnetic armature and the electromagnet containing the coil) has an influence on the inductance of the coil of the solenoid valve injector and thus on the temporal variation of the current in the coil when a voltage is applied to the coil. The smaller the air gap, the higher the inductance of the coil and the slower the current rise in the coil. Correspondingly, the larger the air gap, the faster the current rises, for example. In this way, the air gap can thus be determined in the closed state of the solenoid injector (i.e. when the magnetic armature is not lifted) and in the open state (i.e. when the magnetic armature is lifted as far as possible) by means of a suitable current supply, as a result of which the magnetic armature stroke can be determined very simply. In this case, the values for the initial air gap and the residual air gap can be obtained, for example, by comparing the respective current profile with suitable comparison values, which are determined, for example, within the framework of test measurements.
The magnetic properties of the components used for the solenoid injector also have an additional influence on the dependence of the current profile on the air gap. Thus, for example, use is made of soft magnetic composites having a low electrical conductivityThe material results in a largely eddy-current-free magnetic loop, so that small changes in the air gap already result in significant changes in the magnetic properties and thus in the course of the current change. The value for the initial air gap or the residual air gap can then be determined significantly more accurately. The conductivity of soft magnetic composites (e.g., Somaloy) is typically about 2.3-103S/m, while the conductivity of common materials (e.g. nanohler P800) is three orders of magnitude higher, i.e. about 2.5.106S/m。
In this case, the proposed method is expediently carried out at the end of the production line, so that after the solenoid valve injector has been installed, the stroke can be checked and, if necessary, adapted. Such a solenoid valve injector can then be used, for example, as a fuel injector in an internal combustion engine, which fuel injector serves for introducing fuel.
The performance of the electromagnet, in particular with regard to the switching times and switching speeds during opening and closing and with regard to the stroke, depends mainly on the initial air gap and the residual air gap. A very large number of components have an effect on the initial air gap and the residual air gap, the components having their corresponding tolerances. If the magnetic member is installed arbitrarily in production, significant scattering can occur between different samples of the solenoid valve. By measuring the initial air gap and the residual air gap after mounting and correspondingly correcting the quantities, the tolerances can be significantly limited, for example by selecting the group.
Advantageously, the air gap is determined taking into account the temporal gradient of the current during the current change. As already mentioned, the air gap in the electromagnetic actuator of the solenoid valve has an influence on the rise of the current and, thus, on the time gradient of the current. In this regard, the air gap can be determined very simply in this way.
Preferably, the air gap is determined taking into account a respective time duration, which is necessary until the current of the current course reaches a respective, predetermined value one or more times. In order to determine the initial air gap, for example, a specific voltage can be applied to the coil until the current has reached an assigned, predetermined value, the voltage preferably being the voltage of the boost capacitor, since the voltage of the boost capacitor is more stable than the battery voltage, the current starting from zero or another, predetermined value, for example. Subsequently, the voltage can be reversed in polarity until the current is again zero or another, predetermined value. By repeating this operation, the time effects are added up, so that the amount of the initial air gap can be determined or assigned more simply. In order to determine the residual air gap, for example, a specific voltage can also be applied to the coil until the current has first reached a maximum or maximum permissible value, which voltage is also preferably the voltage of the boost capacitor here, since the voltage of the boost capacitor is more stable than the battery voltage, the current starting from zero, for example. In this way, the magnetic armature can be lifted into contact. The voltage can then be reversed in polarity until the current has reached the associated, predetermined value, i.e. until the current has dropped to this value. Then, the current starts to increase from this predetermined value at the next voltage reversal of polarity. By repeating this operation, the time effects are also summed here, so that the amount of residual air gap can be determined or associated more easily.
Preferably, the magnetic armature is not permanently lifted, while the current profile is detected to determine the initial air gap. This can be achieved, for example, by: as long as a limit value is not reached or exceeded, the current supply is carried out, at which limit value a magnetic force sufficient to lift the magnetic armature is formed. In this way, the determination of the initial air gap can be made very quickly and accurately.
Advantageously, the magnetic armature is permanently raised to the stop means, while the current profile is detected to determine the residual air gap. This can be achieved, for example, by: the energization is carried out in such a way that a limit value is not reached or is undershot, for which the magnetic force is reduced to such an extent that the magnetic armature is pushed away from the electromagnet, for example by a spring. In this way, the determination of the residual air gap can be made very quickly and accurately.
For this purpose, the current supply for determining the residual air gap is expediently carried out in such a way that the magnetic armature is first lifted against the stop means. In this way, it is possible to first perform a determination of the initial air gap and subsequently, in the case of lifting the magnetic armature, a determination of the residual air gap.
Advantageously, a directly switched solenoid valve injector is used as the solenoid valve injector, wherein the stroke of the valve needle of the solenoid valve injector is determined, in particular taking into account the stroke of the magnetic armature. Since the magnetic armature is in direct contact with the valve needle in the case of a directly switched solenoid injector, the stroke of the magnetic armature also corresponds directly to the stroke of the valve needle. The stroke of the valve needle represents a significant quantity for the fuel injection, since the quantity of fuel delivered is determined thereby, among other things, so that an exact knowledge thereof is of great importance.
Advantageously, the stroke of the magnetic armature is adjusted to a desired value by adapting the stop means taking into account the initial air gap and the residual air gap.
Alternatively, it is also preferred when using a directly switched solenoid injector that, instead of the stroke of the magnetic armature, the stroke of the valve needle is adjusted directly to the desired value by adapting the stop means, taking into account the initial air gap and the residual air gap.
Advantageously, the initial air gap of the magnetic armature can also be adjusted to a desired value by adapting the stop means and/or the corresponding distance. This also results in an adaptation of the stroke.
As mentioned, the stroke of the magnetic armature or of the valve needle can be determined very precisely by the proposed method. If this travel now does not correspond to the desired value, for example (as it is provided, for example, for use in a particular internal combustion engine), the travel can be changed very simply by adapting the stop means so that the desired value is reached. After adaptation, the proposed method can be repeated if necessary in order to review the adapted journey. The adaptation of the stop means can be achieved, for example, by simply replacing the stop means (i.e. for example an adjusting disk or an adjusting ring) with other forms of stop means and/or by repositioning. However, it is also conceivable to adapt the screwing torque when mounting the solenoid valve in order to change the air gap or the stroke.
It is also expedient to take into account the determined air gap and/or the formation when actuating the solenoid injector, i.e. to specify an actuation variable as a function thereof. For this purpose, a storage of the corresponding values on the solenoid valve injectors or on the corresponding computing units can be realized, for example, in particular as a machine-readable code.
The computation unit (e.g., a measuring device or a test device) according to the invention is provided, in particular, in terms of program technology, for carrying out the method according to the invention. Such a measuring device or test device can be provided, for example, at the end of the production line, so that after the installation or production of the solenoid valve injector, the stroke can be checked and, if necessary, adapted.
The implementation of the method in the form of a computer program is also advantageous, since this results in particularly low costs, in particular if the measuring device or the test device which is executed is also used for other tasks and is therefore already present. Suitable data carriers for supplying the computer program are, in particular, magnetic, optical and electrical memories, such as a hard disk, flash memory, EEPROM, DVD, etc. It is also possible to download the program via a computer network (internet, intranet, etc.).
Further advantages and solutions of the invention emerge from the description and the attached drawings.
The present invention is illustrated schematically in the accompanying drawings with reference to embodiments and described hereinafter with reference to the drawings.
Drawings
Fig. 1 schematically shows an internal combustion engine with a high-pressure accumulator, wherein an exemplary solenoid injector can be used.
Fig. 2 schematically shows a solenoid valve injector which can be used for the method according to the invention.
Fig. 3a to 3c show the course of the voltage, current and magnetic force when the solenoid injector is energized, as can occur in a preferred embodiment when carrying out the method according to the invention for determining the initial air gap.
Fig. 4 shows the relationship between the duration until the current value is reached a number of times and the initial air gap in the case of an electromagnetic actuator of a solenoid valve.
Fig. 5a to 5c show the course of the voltage, current and magnetic force when the solenoid injector is energized, as can occur in a preferred embodiment when carrying out the method according to the invention for determining the residual air gap.
Fig. 6 shows the relationship between the duration until the current value is reached a plurality of times and the remaining air gap in the case of an electromagnetic actuator of a solenoid valve.
Detailed Description
In fig. 1, an internal combustion engine 100 is schematically and simplified, for which an exemplary solenoid valve injector can be used, and for which the stroke of the solenoid valve injector has to be adjusted. Illustratively, the internal combustion engine 100 has four combustion chambers 103 and one intake pipe 106 connected to each of the combustion chambers 103.
A solenoid valve injector 200 for introducing fuel into the respective combustion chamber 103 is associated with each combustion chamber 103. The solenoid injector 200 is connected to a high-pressure line 162 at a high-pressure accumulator 161 (a so-called rail or common rail). For clarity, only the high pressure line 162 to one of the solenoid operated injectors 200 is shown, however, it should be understood that each of the solenoid operated injectors 200 is connected with a high line.
The high-pressure accumulator 161 is in turn supplied with fuel via the high-pressure pump 160. Here, the high-pressure pump 160 is usually driven by an internal combustion engine. The solenoid injector 200, the high-pressure line 162, the high-pressure accumulator 161 and the high-pressure pump 160 are part of a high-pressure system 165 of the internal combustion engine 100.
Furthermore, a control device 115 is provided, with which the solenoid injector 200 can be actuated.
In more detail than in fig. 1, a solenoid valve injector 200, which can be used for the method according to the invention, is schematically shown in fig. 2. Here, the solenoid injector 200 is configured as a directly switched solenoid injector.
The solenoid injector 200 has a housing 211. At the lower (i.e. arranged in the combustion chamber) end, the housing 211 has at least one (however, typically a plurality of) injection openings 217 for introducing fuel into the combustion chamber of the internal combustion engine.
A bearing surface 218 is formed on the inner wall of the lower end of the housing 211, which bearing surface interacts with a corresponding counter surface of the valve needle 220 in the lowered position of the valve needle 220 in the case of the sealing seat 211, said valve needle being arranged so as to be movable up and down. A pin-shaped valve needle 220 is received with its longitudinal axis 222 in the housing 211.
Here, a high-pressure chamber 224 is formed, which is connected to a high-pressure accumulator 161 (as shown in fig. 1) via a supply opening 225 and a high-pressure line 162 and is thus filled with fuel at high pressure.
In a lower end section of the housing 211, the valve needle 220 has a guide portion 228 with a smaller diameter, the outer diameter of which is adapted to the inner diameter of the housing. The guide portion 228 has a through opening 229, which has an inlet throttle 230, which connects the high-pressure chamber 224 with a reservoir volume 231, through which, in the case of the lifted valve needle 220, fuel is again delivered via the injection opening 217 into the combustion chamber of the internal combustion engine.
In high-pressure chamber 224, valve needle 220 optionally has an annular thickened portion 232, which cooperates with ring 233 in such a way that a pressure gap 234 is formed between the outer circumference of thickened portion 232 and the inner diameter of ring 233, so that thickened portion 232 and ring 233 form a hydraulically acting damping device 235, which radially surrounds thickened portion 232 at least in sections and serves to damp the movement of valve needle 220.
Furthermore, the housing 211 has a through-opening 236 for the valve needle 220 at a plate-shaped or annular guide portion 246. The through-opening 236 acts as a sealing element 237 for the high-pressure chamber 224, to be precise in such a way that as little fuel as possible from the high-pressure chamber 224 flows through the through-opening 236 in the direction of the upper region of the housing 211. At the same time, the through-opening 236 acts as a radial guide for the valve needle 220, so that this valve needle is guided radially in addition to the guide portion 228 by the through-opening 236.
Axially spaced apart from the passage opening 236, a further sealing element 238, which in the exemplary embodiment is plate-shaped or annular, is arranged in the upper region of the housing 211. The second sealing element 238 has a through-bore 239 which surrounds the valve needle 220 at radial intervals. Within the through hole 239 a seal 240 is arranged, which is arranged in abutting contact with the outer circumference of the valve needle 220.
The annular intermediate space 242 can be connected to a fuel return 244 via an outlet opening 243, which extends, for example, in the upper end of the housing 211, between the through opening 236 and the further sealing element 238, which in turn opens into a return container 243. As a result, fuel is conducted out of the housing 211 through the passage opening 236, to be precise in such a way that there is substantially no increased hydraulic pressure (relative to the surroundings) in the intermediate space 242, which fuel overflows from the high-pressure chamber 224 into the intermediate space 242.
A receiving chamber 248 for an electromagnetic actuator 250 is formed in the housing 211. In the exemplary embodiment shown, the electromagnetic actuator 250 has a plate-shaped magnetic armature 252, which is connected to an end region of the valve needle 220 and is preferably made of a soft magnetic material. The magnet armature 252 interacts with an electromagnet 253 having a magnetic core (preferably made of soft iron), which is arranged in the receiving chamber 248 and into which a coil 254 is introduced.
The coil 254 is connected to a voltage source such that a current I can flow in the coil 254, which can provide a voltage U as long as the coil 254 is energized. The voltage source or voltage U can be provided, for example, by the control device 115, when the solenoid injector 200 is installed in an internal combustion engine and is used there, as shown in fig. 1.
However, if the course of the magnetic armature or of the valve needle is determined within the framework of the proposed method, for example at the end of the production line, the voltage source or voltage U can be provided by a suitable measuring or testing device, here for example by a computing unit 200 embodied as a testing device, which can also detect and, if necessary, evaluate the course of the current change.
When valve needle 220 closes the valve seat, magnetic armature 252 is now at a specific distance from electromagnet 253, here by Δ LATo represent the distance. This distance is also referred to as the initial air gap.
The magnetic core 253 has a receptacle or through-hole 255, in which a spring 257 is arranged, one end face of which is supported against the adjusting means 261 (for example in the form of an adjusting disk) and on it against the housing 211 and the other end face of which interacts with the end face of the valve needle 220 facing it. The receiving chamber 248 is connected to the surroundings by a ventilation opening 258, which is arranged in the housing 211, so that the receiving chamber 248 is filled with (ambient) air.
In the following, the function of the solenoid valve injector 200 in use as a fuel injector in an internal combustion engine shall be briefly explained. The high-pressure chamber 224 is filled with high-pressure fuel via the high-pressure accumulator. In the lowered position of the valve needle 220, which is shown in the drawing, the valve needle is pressed by the blocking spring 257 against the bearing surface 218 with the formation of the sealing seat 221, so that the injection opening 217 is closed.
First, the coil 254 is not energized. For the injection of fuel, the coil 254 is energized, so that the magnetic armature 252, which is rigidly connected to the valve needle 220, is lifted from the bearing surface 218 against the closing force of the spring 257 and the injection opening 217 is released. Here, the movement of the valve needle 220 is damped by a damping device 235.
In this case, the magnetic armature 252 is lifted up against a stop means 260, which is designed here as an adjusting disk on the annular thickened portion 232, to the housing. In this position, the magnetic armature is lifted to its maximum, i.e. it has reached its stroke H, and the distance of the magnetic armature 252 from the electromagnet 253 is then referred to as the residual air gap.
To close the injection opening 217, the coil 254 is again disconnected from the voltage source, so that the valve needle 220 rests again against the bearing surface 218, forming the sealing seat 221, due to the spring force of the spring 257. This movement is also influenced or damped by the damping means 235 if necessary.
In fig. 3a to 3c, the voltage U (in V), the current I (in a) and the magnetic force F (in N) are schematically represented in each case with respect to the time t (in ms) when the coil of the solenoid valve injector is energized, as is shown in fig. 2 by way of example, as can occur when the method according to the invention for determining the initial air gap is carried out in a preferred embodiment.
The voltage U, the current I and the magnetic force F in each case show the course of change Ui、IiOr Fi(i = 1, … … 5), wherein the index i represents the initial air gap Δ LAI.e. 240 μm, 230 μm, 220 μm, 210 μm and 200 μm represent labels 1, 2, 3, 4 or 5, respectively.
In fig. 3a, a voltage U is shown, which is applied to the coil. As can be seen in fig. 3b, once the current I in the coil has reached a predetermined value (here, for example, 5A), the voltage is switched in polarity, the current starting from 0A. Subsequently, once the current I drops to 0A again, the voltage is again reversed in polarity. This operation can be repeated a plurality of times.
As can be seen in fig. 3b, the current variation process differs depending on the size of the initial air gap. The smaller the initial air gap, the longer the duration of time to reach a particular value of current. The reason for this is the higher inductance of the coil, which is achieved by the closer magnetic armature, as already mentioned.
Fig. 3c shows the course of the magnetic force F, which is associated with the current I in the coil, which the electromagnet realizes, and into which the coil is introduced. In this case, the magnetic force achieved in each case is not sufficient to lift the magnetic armature.
In fig. 4, the duration Δ t up to the current value (here, 5A) is shown for a plurality of times (here, five times) and the initial air gap Δ L for the electromagnetic actuator of the solenoid valveAThe relationship between them. Here, duration Δ t is described in ms and initial air gap Δ L is described in mmA. Here, it can be seen that the initial air gap Δ LAThe smaller the duration Δ t, the longer it is, as also shown in fig. 3 b.
In fig. 5a to 5c, the voltage U (in V), the current I (in a) and the magnetic force F (in N) are schematically represented in each case with respect to the time t (in ms) when the coil of the solenoid valve injector is energized, as is shown in fig. 2 by way of example, as can occur when the method according to the invention for determining the residual air gap is carried out in a preferred embodiment.
The voltage U, the current I and the magnetic force F are each shown as a course of change U'i、I’iOr F'i(i = 1, … … 5), wherein the index i represents the different values of the residual air gap, i.e. 30 μm, 40 μm, 50 μm, 60 μm and 70 μm represent the indices 1, 2, 3, 4 or 5, respectively.
In fig. 5a, a voltage U is shown, which is applied to the coil. As can be seen in fig. 5b, once the current I in the coil has reached a value (here, for example 12A), which starts at 0A, i.e. without lifting the magnetic armature, the voltage is switched over in polarity. Subsequently, once the current I again falls to the predetermined value (here, for example, 7A), the polarity is switched again. This operation can be repeated a number of times, except for the initial lifting of the magnetic armature (for which the voltage U must be applied for a longer time).
In fig. 5b it can be seen that the current variation process differs depending on the size of the remaining air gap. The larger the remaining air gap, the longer the duration of the current drop to a certain value. The reason for this is the higher inductance of the coil, which is achieved by the closer magnetic armature, as already mentioned.
Here, the relationship is reversed compared to the initial air gap, since the electromagnet is magnetized first, so that a higher inductance leads to a slower reduction of the current when the air gap is smaller.
Fig. 5c shows the course of the magnetic force F, which is associated with the current I in the coil, which the electromagnet produces, and into which the coil is introduced. The magnetic forces respectively achieved in this case are not yet sufficient to lift the magnet armature to the maximum.
In fig. 6, the duration Δ t' (after having reached this value for the first time) until the current value (here, 12A) is reached a plurality of times (here, four times) and the residual air gap Δ L for the electromagnetic actuator of the solenoid valve are shownRThe relationship between them. The duration Δ t' is given in μm, while the remaining air gap Δ LRGiven in mm. It can be seen here that the longer the duration Δ t', the remaining air gap Δ LRThe larger, as can also be seen from fig. 5 b.
As can be seen from fig. 4 to 6, the initial air gap and the residual air gap of the solenoid valve can be determined by suitable energization and, if necessary, by comparison with a comparison value. The stroke of the magnetic armature or of the valve needle is then simply determined from the difference between the initial air gap and the residual air gap, i.e. Δ LA-△LR。
Such a determination of the stroke can be performed, for example, at the end of the production line. Subsequently, when the value of the stroke differs from the desired or required value, the adjusting disk (as shown in fig. 2) can be replaced by a further adjusting disk having another height, which gives, for example, a smaller or larger stroke. The remaining air gap can be adapted, for example, by replacing the adjusting disk 261. In this case, the stroke can also be determined again in order to review the stroke actually achieved with the new adjustment disk.

Claims (14)

1. Method for determining an air gap of a magnetic armature (252) of a solenoid injector (200) having an electromagnet (253) with a coil (254), the magnetic armature (252) being raisable by energizing the coil,
wherein a current profile (I) in the coil (254) during the energization of the coil (254) is taken into accounti) Determining the air gap, which specifies the distance between the electromagnet (253) and the magnetic armature (252),
wherein the air gap is determined taking into account a corresponding time duration (Δ t, Δ t') which is necessary until the current profile (I)i、I’i) Reaches a respective, predetermined value one or more times.
2. Method according to claim 1, wherein the current course (I) is taken into accounti、I’i) In the case of a temporal gradient of the current (I), the air gap is determined.
3. Method according to claim 1, wherein an initial air gap (Δ L) is determined as air gapA) The initial air gap describes a distance between the electromagnet (253) and the magnetic armature (252) when the magnetic armature (252) is not lifted.
4. Method according to claim 3, wherein the magnetic armature (252) is permanently not lifted, while the course of current change (I) is detectedi) To determine said initial air gap (Δ L)A）。
5. Method according to claim 3, wherein the residual air gap (Δ L) is determined as air gapR) The residual air gap specifies the distance between the electromagnet (253) and the magnetic armature (252) when the magnetic armature (252) is lifted against a stop means (260).
6. Method according to claim 5, wherein the magnetic armature (252) is kept permanently raised to the stop means (260) while the course of current variation (l ') is detected'i) To determine said residual air gap (Δ L)R）。
7. Method according to claim 5, wherein for determining the residual air gap (Δ L)R) The energization is carried out in such a way that the magnetic armature (252) is first lifted against the stop means (260).
8. Method according to claim 5, wherein said initial air gap (Δ L) is taken into accountA) And said residual air gap (Δ L)R) In the case of (2), the stroke (H) of the magnetic armature (252) is determined.
9. The method of claim 8, wherein the initial air gap (Δ L) is taken into accountA) And said residual air gap (Δ L)R) -adjusting the stroke (H) of the magnetic armature (252) to a desired value by adapting the stop means (260).
10. Method according to claim 8, wherein the initial air gap (Δ L) of the magnetic armature (252) is adjusted by adapting an adjusting means (261) and/or a corresponding distance taking into account the stroke (H)A) Adjusted to the desired value.
11. Method according to claim 8, wherein a directly switched solenoid injector is used as solenoid injector (200), and wherein the stroke of a valve needle (220) of the solenoid injector (200) is determined and/or adjusted, in particular taking into account the stroke (H) of the magnetic armature (252).
12. Method for operating a solenoid valve injector, wherein a control variable is predefined as a function of an air gap determined according to the method of one of the preceding claims and/or as a function of a stroke of the magnetic armature (252) or of the valve needle (220), the stroke being determined according to the method of one of the claims 8 to 11.
13. A computing unit (280) arranged to perform the method according to any of the preceding claims.
14. A machine-readable storage medium having stored thereon a computer program for causing a computing unit (280) to perform the method according to any one of claims 1 to 12 when it is executed on the computing unit (280).
CN201780013922.8A 2016-02-29 2017-02-08 Method for determining an air gap of a solenoid injector Active CN108699990B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016203182.1 2016-02-29
DE102016203182.1A DE102016203182A1 (en) 2016-02-29 2016-02-29 Method for determining an air gap of a solenoid valve injector
PCT/EP2017/052685 WO2017148664A1 (en) 2016-02-29 2017-02-08 Method for determining an air gap of a magnetic valve injector

Publications (2)

Publication Number Publication Date
CN108699990A CN108699990A (en) 2018-10-23
CN108699990B true CN108699990B (en) 2021-05-25

Family

ID=58016695

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201780013922.8A Active CN108699990B (en) 2016-02-29 2017-02-08 Method for determining an air gap of a solenoid injector

Country Status (4)

Country Link
KR (1) KR20180112036A (en)
CN (1) CN108699990B (en)
DE (1) DE102016203182A1 (en)
WO (1) WO2017148664A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111702146A (en) * 2020-06-30 2020-09-25 江苏理工学院 Electromagnetic valve jet type cooling device for aluminum alloy die-casting die core

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10020896A1 (en) * 2000-04-29 2001-10-31 Lsp Innovative Automotive Sys Position detection method for armature of electromagnetic setting device e..g. for gas changing valve of IC engine
DE102006059070A1 (en) * 2006-12-14 2008-06-19 Robert Bosch Gmbh A fuel injection system and method for determining a needle lift stop in a fuel injector
DE102007031552A1 (en) * 2007-07-06 2009-01-08 Robert Bosch Gmbh Method for determining a position of an armature in a solenoid valve and device for operating a solenoid valve with an armature
DE102008044217A1 (en) * 2008-12-01 2010-06-02 Robert Bosch Gmbh Method for operating electromagnetic actuation unit, particularly electromagnetic operating valve, for example fuel injection valve or brake valve, involves determining current stroke of valve element in consideration of size
DE102010041109A1 (en) 2010-09-21 2012-03-22 Robert Bosch Gmbh Fuel injector for use in e.g. common-rail system, for injecting fuel into combustion chamber of self-ignition combustion engine, has magnetic armature and actuator arranged in injector housing end region that lies opposite to aperture
DE102010041423A1 (en) * 2010-09-27 2012-03-29 Robert Bosch Gmbh Method for adjusting size of air gap between armature and hollow cylindrical quiescent state counter-element of magnetic valve, involves determining start position of armature, and stopping movement of armature during reaching position
DE102011076363B4 (en) * 2011-05-24 2015-08-20 Continental Automotive Gmbh Method and device for determining the opening behavior of a fuel injector for an internal combustion engine
DE102013212138A1 (en) 2013-06-25 2015-01-08 Robert Bosch Gmbh fuel injector
CH709613A1 (en) * 2014-05-08 2015-11-13 Liebherr Machines Bulle Sa Method and device for determining the armature stroke of a magnetic actuator.

Also Published As

Publication number Publication date
KR20180112036A (en) 2018-10-11
CN108699990A (en) 2018-10-23
WO2017148664A1 (en) 2017-09-08
DE102016203182A1 (en) 2017-08-31

Similar Documents

Publication Publication Date Title
US8511153B2 (en) Method for determining the injection law of a fuel injector
US8571821B2 (en) Method for determining the closing time of an electromagnetic fuel injector
US9212640B2 (en) Method for determining the injection law of a fuel injector using a roller-test bench
JP5259839B2 (en) High performance repeatability and high stability fuel injection system for internal combustion engines
US9322356B2 (en) Method and control unit for operating a valve
US10060381B2 (en) Method for determining an opening delay of a fuel injector
US9228520B2 (en) Method and control tool for operating a valve
CN105508068B (en) Method for predetermining the current in a solenoid valve
JP2009036196A (en) Controller for solenoid operated valve
JP4868554B2 (en) Injection valve drive method
Matsumoto et al. Concepts and evolution of injector for common rail system
JP2007040361A (en) Solenoid valve drive controlling method
CN108699989B (en) Determination of electrical actuation time for fuel injector with magnetic coil drive
CN108699990B (en) Method for determining an air gap of a solenoid injector
US20090320797A1 (en) Electromagnetic proportional control valve for flow rate control and fuel supply pump
JP2006509964A (en) Collision-free electromagnetic actuator for injection valve
CN102803689A (en) Determination of the lift delay of a magnetic valve
CN109952622B (en) Method for actuating a magnetic valve of a fuel injector
CN107407219B (en) Injection valve for injecting a fluid, use of an injection valve, and method for producing an injection valve
JP4538814B2 (en) Fluid injection valve flow control device
CN108138682B (en) Determination of time fuel injector is in predetermined state
KR20210077638A (en) Method for operating a fuel supply system
US20200232487A1 (en) Method for ascertaining the movement of an armature of an electric intake valve
JP7013181B2 (en) Fuel injection device
KR101826691B1 (en) Compensation Method for Closing Time of Injector

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant