EP2930724A2 - Électrovanne et procédé de surveillance d'une position de réglage d'une électrovanne - Google Patents

Électrovanne et procédé de surveillance d'une position de réglage d'une électrovanne Download PDF

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Publication number
EP2930724A2
EP2930724A2 EP15160443.6A EP15160443A EP2930724A2 EP 2930724 A2 EP2930724 A2 EP 2930724A2 EP 15160443 A EP15160443 A EP 15160443A EP 2930724 A2 EP2930724 A2 EP 2930724A2
Authority
EP
European Patent Office
Prior art keywords
solenoid valve
armature
coil
resonant circuit
series resonant
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.)
Withdrawn
Application number
EP15160443.6A
Other languages
German (de)
English (en)
Other versions
EP2930724A3 (fr
Inventor
Michael Sanders
Andreas Köster
Andres Dr. Tönnesmann
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.)
Pierburg GmbH
Original Assignee
Pierburg 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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP2930724A2 publication Critical patent/EP2930724A2/fr
Publication of EP2930724A3 publication Critical patent/EP2930724A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1684—Armature position measurement using coils

Definitions

  • the invention relates to a solenoid valve and a method for monitoring a control position of such a solenoid valve.
  • Solenoid valves are known in various designs and are used inter alia for the control and regulation of fluid flows in vehicles.
  • hydraulic control hydraulic pressures for operating vehicle units via solenoid valves are controlled and regulated.
  • the work of a vehicle unit can depend on the released by means of the solenoid valve control pressure, so that the vehicle unit can be controlled or controlled directly via the solenoid valve.
  • the control or circuit of a solenoid valve in a vehicle is usually via an engine control unit and causes a displacement of an armature within the solenoid valve, so that a fluid channel is opened or closed.
  • the anchor may in particular be switchable to a 'locked position' or to an 'open position'.
  • the displacement or positioning of the armature in a parking position is of crucial importance for the tightness of the valve and thus for the function of the vehicle unit.
  • the smallest irregularities in the position of the solenoid valve, in particular in the 'blocking position' can lead to a leakage current and thereby have negative effects on the control or performance of the vehicle unit.
  • a function check of a solenoid valve is known in which during a switching operation of the solenoid valve, the excitation current is detected as a function of time.
  • the temporal change of the exciter current is calculated and compared with defined desired values.
  • accelerations of the armature can be determined, which can reproduce, for example, a shifting start, a hooking movement and / or an end position of the armature.
  • the DE 43 13 273 C2 describes an evaluation circuit of an inductive displacement sensor for detecting the position of a displaceably arranged in a coil armature, taking into account temperature influences.
  • the voltage applied to the displacement sensor voltage is detected as a function of time. From this, the inductance of the displacement sensor or the present path is determined by calculation. In a further step, the measured value of the displacement sensor is corrected by a previously determined sensor temperature.
  • a disadvantage of the known systems is that the sensors are relatively complex and expensive, so that the manufacturing and assembly costs of the solenoid valves are relatively high. Furthermore, it requires for the forwarding and / or evaluation of the detected signals additional components to the solenoid valve, whereby the solenoid valve is relatively large and heavy.
  • Object of the present invention is therefore to provide a solenoid valve that allows a relatively safe and accurate monitoring of the currentless end-position of the anchor and is relatively compact and inexpensive. Furthermore, a method is to be provided which allows a fast, safe and cost-effective monitoring of the positioning position of the armature.
  • the solenoid valve comprises a housing having a passage or a chamber, which has at least one inlet opening and one outlet opening for forming a fluid channel through which a fluid can flow.
  • a fluid can flow through the inlet opening into the fluid channel and flow out of the fluid channel through the outlet opening.
  • a preferably cylindrically shaped and axially displaceably mounted armature is arranged within the housing.
  • the armature is displaceable between a first setting position, in particular a blocking position, and a second setting position, in particular an open position. In the first setting position, the fluid channel is completely shut off by the armature, so that the fluid can not flow through the fluid channel.
  • the fluid channel is at least partially open, so that the fluid can flow through the solenoid valve.
  • the armature is biased by an anchor spring, in particular a coil spring or compression spring, in the first setting position, so that the locking position is the 'fail-safe position'.
  • an electromagnetic drive with a current-carrying coil and an iron core arranged therein intended. By applying an electrical switching current in the coil, a magnetic force is generated in the center of the coil, in particular in the iron core arranged therein.
  • the coil can be connected to at least one capacitor to form a series resonant circuit.
  • the coil can be used both for switching the solenoid valve and for monitoring the positioning position of the armature.
  • the coil can be acted upon either with a switching current for moving the armature or with a measuring current or measuring signal for monitoring the setting position of the armature of the solenoid valve.
  • the measurement signal is considerably lower compared to the switching current, so that movement of the armature according to the invention is not triggered by the measurement signal.
  • the measuring signal is a high-frequency alternating signal and would move the armature with sufficient size. But in the present case, the measurement signal is too weak and the inertia of the armature too high.
  • the armature thus remains in its position when the coil is acted upon by a measuring signal.
  • the measuring signal has a defined measuring frequency, for example generated by a separately arranged generator.
  • the measuring frequency is preferably in the vicinity of the resonance frequency of the series resonant circuit, that is, in a region adjacent to the resonant frequency of the series resonant circuit.
  • the coil is thus used as a sensor for determining or monitoring the positioning position of the armature.
  • alternating high current strengths and high electrical voltages occur between the coil and the capacitor.
  • the thus formed on a resistor voltage drop (or voltage drop called) is measured here and used to determine the position of the armature.
  • the voltage drop changes with a change in the air gap formed between the iron core and the armature, that is, the magnetic resistance formed thereby, the so-called inductive reactance.
  • a deviation of the defined magnetic resistance or the armature of the defined parking position that is, a faulty position of the armature can be detected.
  • a significant deflection of the voltage occurs.
  • the voltage drop or the amplitude of the voltage drop which is an indication of a malposition of the armature, is particularly pronounced in comparison to a voltage drop in the case of a correct positioning position of the armature.
  • This effect becomes stronger, the closer the frequency of the measuring signal or the measuring frequency in the range of the resonance frequency of the Series resonant circuit is, in particular by the voltage amplitude and the voltage amplitude excursion is greater.
  • the end position of the solenoid valve can be detected very accurately in a relatively simple manner.
  • the coil in the series resonant circuit with a separately formed generator is interconnected.
  • a signal required for monitoring the setting position can be provided by the generator at a defined measuring frequency.
  • the generator preferably generates a constant signal frequency, which is particularly preferably in the range of the resonant frequency of the series resonant circuit.
  • the generator can also be designed as a processor, which can serve for signal evaluation and / or signal transmission.
  • the coil is connected in the series resonant circuit with a separately formed electrical resistance.
  • the resistor has a defined electrical size, so that on the one hand, the vibration between the coil and capacitor is not weakened too strong and on the other hand, a rash remains recognizable in a voltage drop.
  • a resistor with 100ohms is chosen.
  • the resistor may be formed separately.
  • the generator is particularly preferably arranged as a microprocessor on the solenoid valve.
  • the separate electrical resistance of the series resonant circuit can be arranged in the solenoid valve. As a result, all the components of the series resonant circuit can be arranged on the solenoid valve.
  • the capacitor and / or the generator are arranged in a control unit of the vehicle.
  • the solenoid valve can be constructed relatively small.
  • a control device such as an on-board diagnostic system
  • a microprocessor available, which can be used as a generator of the series resonant circuit.
  • the same can also apply to the capacitor of the series resonant circuit.
  • an additional generator or capacitor can be omitted, whereby the manufacturing and assembly costs can be further reduced.
  • the coil with at least one protective diode and / or a voltage-dependent resistor, a so-called varistor, arranged in parallel.
  • a self-induced overvoltage on the coil can be prevented after switching off the current.
  • the coil is designed as a bobbin having a main winding, in which a switching current for moving the armature can be applied, and / or a sensor winding, in which a measuring signal for determining the position of the armature can be applied.
  • the coil may consist of only one bobbin consisting of both the main winding and the sensor winding.
  • the sensor winding may in this case also be formed as a part of the main winding. This allows the coil to be constructed relatively space-saving.
  • the main winding and the sensor winding each as a separate winding or as a be formed separate bobbin. In this case, the coil has a plurality of bobbin.
  • the bobbins can be arranged axially and / or radially adjacent. As a result, both bobbins with respect to the arrangement are independent of each other.
  • the sensor winding is substantially smaller than the main winding, in particular flatter, and may be arranged inside and / or adjacent to the main winding. That is, the sensor winding may be integrated with the main winding in the main winding and / or decoupled from the main winding as a separate winding adjacent the main winding.
  • the main winding and / or the sensor winding of the coil can preferably be connected to a series resonant circuit by at least one capacitor.
  • the sensor winding is arranged radially on the outside of the main winding.
  • the actual function of the coil namely the generation of a magnetic force for switching the armature or the valve, is not impaired by the arrangement of the sensor winding.
  • the arrangement of the sensor winding does not influence the small distance required between the main winding and the iron core to build up a magnetic field. As a result, the switching current required for switching can be unchanged or relatively low.
  • the main winding and the sensor winding of the coil can preferably be energized independently of one another.
  • the coil can be subjected to the measurement signal independently of the switching current.
  • the measurement accuracy can be increased and thus the determination of the anchor position can be significantly improved.
  • the main winding is completely de-energized connected. The measurement of the armature position via the sensor winding can thus be carried out completely independently of the main winding.
  • the solenoid valve has a microcontroller or microprocessor.
  • the main winding and / or the sensor winding for signal processing, in particular for signal generation and signal evaluation can be interconnected with a microcontroller, in particular with a so-called PIC microcontroller.
  • the microcontroller may be disposed within the solenoid valve.
  • the microcontroller can be arranged in a control unit of the vehicle.
  • the microprocessor forms the generator of the series resonant circuit.
  • the coil is connected at least with a capacitor to a series resonant circuit.
  • the series resonant circuit additionally comprises a resistor and a generator.
  • a measurement signal having a defined measurement frequency is applied in the coil and the voltage applied to the series resonant circuit, in particular falling voltage, is detected.
  • the impedance is determined by means of the defined measuring signal and the detected voltage drop. This can be done purely mathematically.
  • the exact positioning position of the armature can be determined or checked via previously defined comparison values. This is done by a dependence of the impedance of the air gap between the armature and iron core or of the adjustment position of the armature.
  • the inductive component of the impedance changes with the displacement of the armature due to the change in the air gap formed between the armature and the iron core of the coil.
  • the measurement signal required for determining the impedance or the positioning position of the armature is substantially lower than the switching current required to move the armature.
  • the determination of the setting position takes place only when no switching current is applied to the coil.
  • the measurement is particularly preferably carried out in a frequency range of the measurement signal which is close to the resonance of the series resonant circuit. This makes it possible that even small changes in the positioning position of the armature or small changes in the inductance cause a large change in the measured impedance.
  • the capacitor can remain constant.
  • the measuring signal for determining the positioning position of the armature is applied only in the sensor winding of the coil, in particular in the arrangement of a decoupled from the main winding or separately formed sensor winding.
  • the main winding of the coil for switching the solenoid valve can be completely de-energized in a first actuating position or acted upon to switch the solenoid valve in a second actuating position with a switching current.
  • the measuring signal is applied in the separate sensor winding of the coil. The determination of the positioning position and the displacement of the armature can thus be independent of each other.
  • the solenoid valve 1 is shown schematically in a preferred embodiment.
  • the solenoid valve 1 according to the invention has a housing 10 which essentially comprises a fluid channel 11, an armature 12 for blocking the fluid channel 11 and an electromagnetic drive unit 2.
  • the fluid channel 11 can be traversed by a fluid which can flow into the fluid channel 11 through the inlet opening 11a, 11b and can flow out of the fluid channel 11 through the outlet opening 11c.
  • the electromagnetic drive unit 2 consists essentially of a coil 14 and an iron core 21 and serves to connect the solenoid valve 1.
  • the housing 10 has a connection device 80 for connection to a control module known per se and not shown on.
  • armature 12 is biased by an armature spring 22 relative to the iron core 21 in the direction of the first switching position 121.
  • the armature spring 22 is guided in a part of the iron core 21.
  • a relatively large air gap 102 is formed, which may be formed larger or smaller depending on the adjustment position 121, 122 of the armature 12.
  • the air gap 102 formed between the iron core 21 and the armature 12 thus has a defined width, depending on the setting position 121, 122 of the armature 12. This is the determination or monitoring of the adjustment position 121, 122 of the armature 12 relative to the iron core 21.
  • the air gap 102 is in particular an electrical resistance, which also changes when the air gap 102 is changed. In particular, the value of the electrical resistance may correspond to the width of the air gap 102.
  • the electrical resistance corresponding to a width of the air gap 102 can be detected.
  • the electrical resistance decreases or the inductive component of the impedance increases as the air gap 102 decreases, that is to say when the armature 12 is displaced in the direction of the open position 122 or in the direction of the iron core 21.
  • the electronic components required for connecting the coil 14 to a series resonant circuit 101 namely a capacitor 15, a generator 16 and a resistor 20, are in the in FIG. 1 shown embodiment is not arranged or integrated on the solenoid valve 1, but in an unillustrated engine control unit of the vehicle, not shown.
  • a solenoid valve 1 is shown schematically in a further preferred embodiment.
  • This in FIG. 2 illustrated solenoid valve 1 has in comparison to the in FIG. 1 shown solenoid valve 1 in addition to all electronic components for interconnecting the coil 14 to a series resonant circuit 101.
  • at least one capacitor 15, a generator 16 and a resistor 20 are arranged in the region of the connection device 80 of the solenoid valve 1.
  • the capacitor 15, generator 16 and resistor 20 are arranged in particular on a circuit board 19 and connected via a line to the coil 14.
  • FIGS. 3 and 4 In each case, a measuring arrangement 100 is shown in which the coil 14 of the solenoid valve 1 is connected to determine the setting position of the armature 12 to a series resonant circuit 101.
  • the coil 14, the capacitor 15, the generator 16 and the electrical resistance 20 are connected to a series resonant circuit 101.
  • the measurement signal generated by the generator 16 and applied to the coil 14 can thereby be set in oscillation with the capacitor 15 at a specific frequency.
  • This measurement frequency is preferably in the range of the resonance of the series resonant circuit 101.
  • a voltage measuring device 17 For measuring a prevailing voltage, a voltage measuring device 17 is provided, with which the coil 14 is arranged in parallel. As a result, the voltage applied to the coil 14 voltage can be detected in a relatively simple manner.
  • the voltage measuring device 17 is preferably connected to the microcontroller or is the microcontroller.
  • the FIG. 4 also shows a series resonant circuit 101 comprising the coil 14, the capacitor 15, the generator 16 and the electrical resistor 20, wherein in the series resonant circuit 101 in FIG. 4 additionally two protective diodes 18 are arranged.
  • the protection diodes 18 prevent an overvoltage generated by self-induction occurring in the series resonant circuit 101 after switching off the current in the coil 14.
  • the air gap 102 located between the armature 12 and the iron core 21 is shown schematically, the air gap 102 being enlarged or reduced when the armature 12 is displaced.
  • the coil 14 for switching the solenoid valve 1 a main winding 14a and for determining the position of the armature 12, a sensor winding 14b.
  • the sensor winding 14b is disposed radially outward of the main winding 14a and is made substantially smaller in comparison with the main winding 14a.
  • the main winding 14a and / or the sensor winding 14b surround the armature 12 at least partially and may be constructed of the same material.
  • the sensor winding 14b is in a measuring arrangement 100 connected to a series resonant circuit 101, as in FIG FIG. 6 represented, arranged.
  • the main winding 14a is not connected to the series resonant circuit 101 here.
  • the main winding 14a and the sensor winding 14b are arranged in parallel.
  • FIG. 6 is one to the in FIG. 5 illustrated embodiment of the solenoid valve 1 corresponding, connected to a series resonant circuit 101 measuring arrangement 100 is shown.
  • the coil 14 for switching the solenoid valve 1 has a main winding 14a and for determining the adjusting position 121, 122 a sensor winding 14b.
  • the Main winding 14a and the sensor winding 14b are energized independently of each other.
  • a current can be applied to the sensor winding 14b via the generator 16; the voltage applied in the series resonant circuit 101 is measured via the voltage indicator 17.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
EP15160443.6A 2014-04-09 2015-03-24 Électrovanne et procédé de surveillance d'une position de réglage d'une électrovanne Withdrawn EP2930724A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014105047.9A DE102014105047A1 (de) 2014-04-09 2014-04-09 Magnetventil und Verfahren zur Überwachung einer Stellposition eines Magnetventils

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EP2930724A2 true EP2930724A2 (fr) 2015-10-14
EP2930724A3 EP2930724A3 (fr) 2015-10-21

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EP15160443.6A Withdrawn EP2930724A3 (fr) 2014-04-09 2015-03-24 Électrovanne et procédé de surveillance d'une position de réglage d'une électrovanne

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EP (1) EP2930724A3 (fr)
DE (1) DE102014105047A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016120655A1 (de) * 2016-10-28 2018-05-03 Kruno Pranjic Verfahren zur Zustandsüberwachung eines Magnetventils
DE102020115754A1 (de) 2020-06-15 2021-12-16 Kendrion (Villingen) Gmbh Ventilblock und Verfahren zur Reinigungsmediumversorgung sowie Verwendung eines Ventilblocks
EP4504426A1 (fr) 2022-04-08 2025-02-12 Focke & Co. (GmbH & Co. KG) Procédé de fonctionnement d'une électrovanne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020206750A1 (de) 2020-05-29 2021-12-02 Robert Bosch Gesellschaft mit beschränkter Haftung Vorrichtung und Verfahren zur Datenübertragung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3807278A1 (de) 1988-03-05 1989-09-14 Tech Ueberwachungs Verein Rhei Verfahren zur sicherheitstechnischen ueberpruefung von magnetventilen und messanordnung zur durchfuehrung des verfahrens
DE4313273C2 (de) 1993-04-23 1998-09-03 Wabco Gmbh Auswerteschaltung für einen induktiven Sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19913868C1 (de) * 1999-03-26 2000-07-20 Siemens Ag Positionssensor, geeignet für elektromagnetisch betriebene Ventilsteuerung
DE10031237C2 (de) * 2000-06-27 2003-08-14 Daimler Chrysler Ag Elektromagnetischer Aktuator, insbesondere zur Betätigung eines Gaswechselventils einer Brennkraftmaschine
DE102005012752A1 (de) * 2005-03-19 2006-09-21 Continental Aktiengesellschaft Verfahren zur digitalen Stromregelung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3807278A1 (de) 1988-03-05 1989-09-14 Tech Ueberwachungs Verein Rhei Verfahren zur sicherheitstechnischen ueberpruefung von magnetventilen und messanordnung zur durchfuehrung des verfahrens
DE4313273C2 (de) 1993-04-23 1998-09-03 Wabco Gmbh Auswerteschaltung für einen induktiven Sensor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016120655A1 (de) * 2016-10-28 2018-05-03 Kruno Pranjic Verfahren zur Zustandsüberwachung eines Magnetventils
DE102016120655B4 (de) * 2016-10-28 2020-02-13 Kruno Pranjic Verfahren zur Zustandsüberwachung eines Magnetventils
DE102020115754A1 (de) 2020-06-15 2021-12-16 Kendrion (Villingen) Gmbh Ventilblock und Verfahren zur Reinigungsmediumversorgung sowie Verwendung eines Ventilblocks
EP4504426A1 (fr) 2022-04-08 2025-02-12 Focke & Co. (GmbH & Co. KG) Procédé de fonctionnement d'une électrovanne

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Publication number Publication date
DE102014105047A1 (de) 2015-10-15
EP2930724A3 (fr) 2015-10-21

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