WO2002066931A1 - Dispositif de detection servant a detecter la position d'un induit se deplaçant par voie electromagnetique - Google Patents

Dispositif de detection servant a detecter la position d'un induit se deplaçant par voie electromagnetique Download PDF

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Publication number
WO2002066931A1
WO2002066931A1 PCT/DE2002/000482 DE0200482W WO02066931A1 WO 2002066931 A1 WO2002066931 A1 WO 2002066931A1 DE 0200482 W DE0200482 W DE 0200482W WO 02066931 A1 WO02066931 A1 WO 02066931A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
measuring
sensor arrangement
voltage
armature
Prior art date
Application number
PCT/DE2002/000482
Other languages
German (de)
English (en)
Inventor
Roland Schempp
Ulrich Müller
Peter Sautter
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 WO2002066931A1 publication Critical patent/WO2002066931A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/243—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the phase or frequency of ac
    • 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
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1844—Monitoring or fail-safe circuits
    • H01F2007/185—Monitoring or fail-safe circuits with armature position measurement

Definitions

  • the invention relates to a sensor arrangement for detecting the position of an electromagnetically moved armature according to the preamble of the main claim.
  • a stroke position is detected in a lifting magnet in such a way that a magnetic circuit is formed with an additional measuring winding and the movable armature of the lifting magnet.
  • the measuring winding is fed with an alternating voltage and the inductive resistance of the measuring winding, which is dependent on the position of the armature, is then evaluated for the detection of the stroke position.
  • the core of the electromagnet mechanically connected to a valve element or a valve slide reaches defined positions relative to the solenoid coil, in which the valve is either open or closed.
  • the detection of this switching position of the valves is important, for example, when monitoring machine movements caused by hydraulic or pneumatic actuators.
  • this known arrangement can be used to monitor the valve function in connection with the control of the machine for diagnostic purposes or for sequence control of various movements and other information technology tasks.
  • a pressure-tight mechanical coupling of a stroke measuring system to the magnetic core or to the coupled valve element should be possible without great technical effort.
  • an inaccurate detection can also take place if, for example, the magnetic core remains in a position in front of the actual positions (open, closed) due to contamination in the valve or due to a change in the flow conditions ,
  • the sensor arrangement for detecting the position of an electromagnetically moved armature of the type specified at the outset, with at least one work coil and at least one measuring coil to which an alternating voltage is applied, is further developed according to the invention.
  • both the working coil and the measuring coil with the alternating voltage can be evaluated for an AC voltage with a constant frequency by measuring the phase shift between the current and the voltage in the respective coil and for an AC voltage with a variable frequency by detecting the change in the resonance frequency of the resonant circuit can be detected with the respective coil.
  • the detection of the position of the armature in the state of no working current flow in the work coil by means of the work coil can preferably be carried out by measuring the phase shift between the current and the voltage.
  • the detection of the position of the armature in the state of an operating current flow in the working coil is easily possible with the measuring coil by detecting the change in the resonant frequency of the resonant circuit with the measuring coil.
  • the invention thus uses measuring principles which, for example, permit a static measurement of the inductance for the relatively accurate and reliable display of the switching positions of a valve.
  • the inductance of the magnetic coils is dependent in a manner known per se on the depth with which a magnetic core or an armature is immersed in the coil.
  • an alternating current flows through them and the measurements of the phase and / or frequency shift specified in the main claim can thus be carried out.
  • Working coil advantageously uses the measuring coil independent of the working coil of the valve.
  • the magnetic flux of this measuring coil is close to or in the area of saturation of the magnetic circuit when the measuring coil is switched on, which means that the design of the measuring coil is decisive for the measuring accuracy.
  • the radial arrangement of the measuring coil at the end of the working coil is a good solution with which both measuring principles described above can be used.
  • the working frequency of the measuring coil can typically be in the range of a few kHz.
  • the direct current through the work coil drops to zero in a sufficiently short time for the measurement.
  • both the independent measuring coil and the work coil are available for the measurement.
  • the magnetic flux is far from the saturation range.
  • a central radial arrangement of the measuring coil is well suited.
  • the radially arranged work coil is advantageously used to measure the inductance, which is not traversed by the working current when the valve is at rest.
  • the work coil has a typical working frequency in the range of 10 to 30 Hz. Applying the frequency measurement would lead to a resonant circuit with capacitors of large size and poor temperature behavior, so that in this case the phase measurement leads to better results.
  • An evaluation of the electrical quantities detected with the sensor arrangement according to the invention can advantageously be simplified with a switching device with which the working current flow in the work coil and the respective connection of the measuring arrangement for the phase shift and the frequency change to the relevant coils can be effected.
  • a temperature sensor is attached to the valve with which a threshold value for the Display of the position of the anchor can be corrected in an evaluation logic.
  • the evaluation is preferably carried out with a computer module with which an alternating voltage of constant frequency can be generated and a measurement of the phase shift between the current and the voltage at the work coil as well as a detection of the change in the resonance frequency of the resonant circuit consisting of an oscillator and the respective coil ,
  • the aforementioned switching device can also be controlled with the computer module.
  • FIG. 5 shows a first exemplary embodiment of the sensor arrangement with an evaluation circuit
  • Figure 6 shows a second embodiment of the sensor arrangement with an evaluation circuit
  • Figure 5 shows a third embodiment of the sensor arrangement with an evaluation circuit and a computer module.
  • FIG. 1 shows a valve 1 for a hydraulic system, for example in a known working machine, in which a valve slide can be actuated with an armature 2 of an electromagnet or can be moved into different valve positions according to arrow 3 in a yoke closed on one side.
  • the electromagnet also has a work coil 4 and a measuring coil 5 arranged axially behind it.
  • the measuring coil 5 is attached axially in front of the work coil 4.
  • the measuring coil 5 is arranged axially in the middle between the two work coil parts 4a and 4b, and an arrangement with a radially inner measuring coil 6 and a radially outer working coil 7 can be seen from FIG.
  • the arrangement of the work coil 4 and the measurement coil 5 corresponds to the illustration according to FIG. 1.
  • the connections 10 and 11 of the work coil 4 are here with a circuit for measuring the phase shift between the current and the
  • the voltage in the work coil 4 and the connections 12 and 13 of the measuring coil 5 are connected to a circuit for evaluating the shift in the resonance frequency in this coil 5.
  • the valve 1 is switched off, ie the armature 2 is in its idle position and no direct current flows through the work coil 4.
  • a contact 14 of a switching device 15 can be caused that the output signal of a clock generator 16 is applied to the work coil 4, so that the work coil 4 is acted upon by an AC voltage of constant frequency.
  • a phase measuring device 17 is connected via a resistor R1, with which the voltage and the measuring current of the working coil 4 and thus the phase shift between these variables can be determined via the looped-in resistor R1. Since the phase shift or the inductance of this circuit is dependent on the depth with which the armature 2 plunges into the work coil 4, the switching position of the valve 1 in this working state can be clearly determined with this method.
  • the measuring coil 5 according to FIG. 5 is connected via the connections 12 and 13 to an oscillator 18 as part of an oscillating circuit, the oscillating frequency of which can be detected by a frequency measuring device 19.
  • the oscillator 18 is switched off with a contact 20 of the switching device 15, so that an evaluation logic 21 in this idle state only evaluates the signal coming from the phase measuring device 17, for example by comparison with predetermined threshold values, and at an output 22 outputs the signal "open" for the state of valve 1.
  • an evaluation logic 21 in this idle state only evaluates the signal coming from the phase measuring device 17, for example by comparison with predetermined threshold values, and at an output 22 outputs the signal "open" for the state of valve 1.
  • valve 1 In the working state not explicitly shown in FIG. 5, valve 1 is then switched on, so that armature 2 moves upward.
  • a control signal at input 2 for example the output signal of a machine control, effects the actuation of contact 14 in switching device 15 in such a way that work coil 4 is connected via a circuit 25 is supplied with a direct current.
  • the contact 20 switches on the oscillator 18 and a contact 26 switches the evaluation logic 21 to the output of the frequency measuring device 19.
  • the signal "closed" for the state of the signal appears at the output 22 of the evaluation logic 21 Valve 1, since a corresponding frequency change in the resonant circuit with the measuring coil 5 has been detected by the movement of the armature 2.
  • the work coil 4 is driven directly by the supply current at input 25 and the evaluation logic 21 receives the information about the switching state of the valve 1 at a connection 26 directly from the input 25
  • Work coil 5 and measuring coil 4 are permanently switched on, their inputs 10, 11 and 12, 13 being permanently protected against damage by interference signals by suitable conventional measures.
  • the direct coupling of the work coil 4 to the supply voltage and the evaluation of this voltage control the switching of the measurement signals between the measurement of the phase shift and the measurement of the frequency change itself.
  • the valve 1 can be connected in a simple manner in the same way as not valve equipped with a switch position indicator.
  • the evaluation of the signals and the control of the switching display “open” or “closed” are carried out completely by a computer module 30.
  • the measuring principles described above are essentially retained.
  • the switching of the respective measuring arrangement on the work coil 4 and the measuring coil 5 is carried out here by electronic switches 31, 32 and 33, which are digital Outputs 34, 35 and 36 of the computer module 30 can be controlled.
  • valve 1 or the direct current supply 25 of the work coil 4 can be switched on or off by the digital signal output 34 "digital out 1" of the microcomputer 30 via the switch 31.
  • the signal for the switching display 22 "open” or “closed” is also available in this exemplary embodiment.
  • the measuring coil 4 is not required when the valve is switched off, as described above.
  • the temperature of the magnetic arrangement can easily be determined by the internal resistance of the measuring coil 5, since this is linked to the temperature of the measuring coil 5 via the known temperature coefficient.
  • the thermal coupling of the measuring coil 5 with the magnetic arrangement enables a temperature-dependent correction of the position of the armature 2, so that the temperature sensor 23 shown in FIGS. 5 and 6 can be omitted.
  • the measuring coil 5 is for temperature measurement by the computer-controlled switches 32 and 33 connected to a supply voltage U sensor with one side and to ground with the other side via a sensor resistor R3. With the signals "analog in 4" at connection 39 and "analog in 6" at connection 40, the computer module can calculate the internal resistance of the measuring coil 5 from voltage and current and from this the temperature.
  • the oscillator 18 for frequency measurement on the measuring coil 5 corresponds to the oscillator of the exemplary embodiments according to FIGS. 5 and 6. It is switched on by the signal at the connection 41 "digital out 3" of the computer module 30 when the valve 1 is switched on and thus the work coil 4 is flowed through by direct current.
  • the signal "analog in 5" at the connection 32 on the computer module 30 detects the frequency of the oscillator 18. From the measured frequency, the computer module 30 calculates the position of the armature 2 according to the measurement principle described above.
  • the work coil 4 is advantageously used to measure the internal resistance and thus the temperature of the magnetic arrangement.
  • computer module 30 can also calculate the internal resistance of work coil 4 and, as previously described, the temperature.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

La présente invention concerne un dispositif de détection servant à détecter la position d'un induit (2) se déplaçant par voie électromagnétique. Ledit dispositif comprend au moins une bobine active (4, 4a, 4b; 7) servant à produire un champ magnétique grâce auquel l'induit (2) peut se déplacer, et au moins une bobine de mesure (5, 6) alimentée par une tension alternative et servant à détecter des grandeurs électriques en fonction de la position de l'induit. Les bobines actives (4, 4a, 4b; 7) et les bobines de mesure (5, 6) peuvent être alimentées par la tension alternative, les grandeurs électriques pouvant être détectées, dans le cas d'une tension alternative à fréquence constante, grâce à une mesure du déphasage entre l'intensité et la tension dans la bobine respective (4, 4a, 4b; 7), et, dans le cas d'une tension alternative à fréquence variable, grâce à une détection du changement de fréquence de résonance d'un circuit oscillant au moyen de la bobine respective (5; 6).
PCT/DE2002/000482 2001-02-23 2002-02-09 Dispositif de detection servant a detecter la position d'un induit se deplaçant par voie electromagnetique WO2002066931A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10108721.7 2001-02-23
DE2001108721 DE10108721A1 (de) 2001-02-23 2001-02-23 Sensoranordnung zur Erfassung der Lage eines elektromagnetisch bewegten Ankers

Publications (1)

Publication Number Publication Date
WO2002066931A1 true WO2002066931A1 (fr) 2002-08-29

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DE (1) DE10108721A1 (fr)
WO (1) WO2002066931A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007134287A1 (fr) * 2006-05-12 2007-11-22 Parker-Hannifin Corporation Dispositif de mesure de déplacements
US9428164B2 (en) 2013-02-28 2016-08-30 Bendix Commercial Vehicle Systems Llc Valve assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011000405U1 (de) * 2011-02-22 2012-05-23 Rollax Gmbh & Co. Kg Induktive Wegmesseinrichtung
EP2657651B1 (fr) * 2012-04-25 2019-11-13 Sensata Technologies, Inc. Capteur de position
DE102019131406A1 (de) * 2019-11-21 2021-05-27 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zur Ermittlung des Zustands eines Magnet-Schaltelements

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445005A1 (fr) * 1978-12-20 1980-07-18 Binder Magnete Electro-aimant de commande avec detection de course
US4521762A (en) * 1981-08-27 1985-06-04 Gte Automatic Electric Laboratories, Incorporated Integratable D/A converter
JPS6313307A (ja) * 1986-07-04 1988-01-20 Komatsu Ltd ソノレイドのストロ−ク制御方法
US4950985A (en) * 1987-12-09 1990-08-21 Herion-Werke Kg Apparatus for measuring electromagnetic values of a coil, in particular for measuring the position of armature of a coil/armature magnetic system
US5172298A (en) * 1990-01-09 1992-12-15 Honda Giken Kogyo Kabushiki Kaisha Electromagnetic actuator
GB2287542A (en) * 1994-03-17 1995-09-20 Fmc Corp Sensorless measurement of electromagnetic actuator displacement device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445005A1 (fr) * 1978-12-20 1980-07-18 Binder Magnete Electro-aimant de commande avec detection de course
US4521762A (en) * 1981-08-27 1985-06-04 Gte Automatic Electric Laboratories, Incorporated Integratable D/A converter
JPS6313307A (ja) * 1986-07-04 1988-01-20 Komatsu Ltd ソノレイドのストロ−ク制御方法
US4950985A (en) * 1987-12-09 1990-08-21 Herion-Werke Kg Apparatus for measuring electromagnetic values of a coil, in particular for measuring the position of armature of a coil/armature magnetic system
US5172298A (en) * 1990-01-09 1992-12-15 Honda Giken Kogyo Kabushiki Kaisha Electromagnetic actuator
GB2287542A (en) * 1994-03-17 1995-09-20 Fmc Corp Sensorless measurement of electromagnetic actuator displacement device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 217 (E - 624) 21 June 1988 (1988-06-21) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007134287A1 (fr) * 2006-05-12 2007-11-22 Parker-Hannifin Corporation Dispositif de mesure de déplacements
US7969146B2 (en) 2006-05-12 2011-06-28 Parker-Hannifin Corporation Displacement measurement device
US9428164B2 (en) 2013-02-28 2016-08-30 Bendix Commercial Vehicle Systems Llc Valve assembly

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Publication number Publication date
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