DE102008020325A1 - Angular sensor i.e. inductive angle sensor, for e.g. motor vehicle, has transmission coil for inducing alternating current voltage in distributor coil, where measuring element is movable relative to transmission coil - Google Patents
Angular sensor i.e. inductive angle sensor, for e.g. motor vehicle, has transmission coil for inducing alternating current voltage in distributor coil, where measuring element is movable relative to transmission coil Download PDFInfo
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- DE102008020325A1 DE102008020325A1 DE102008020325A DE102008020325A DE102008020325A1 DE 102008020325 A1 DE102008020325 A1 DE 102008020325A1 DE 102008020325 A DE102008020325 A DE 102008020325A DE 102008020325 A DE102008020325 A DE 102008020325A DE 102008020325 A1 DE102008020325 A1 DE 102008020325A1
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- coil
- signal
- frequency
- angle sensor
- measuring element
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- 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
- G01D5/204—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 mutual induction between two or more coils
- G01D5/2073—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 mutual induction between two or more coils by movement of a single coil with respect to two or more coils
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
Die
Erfindung geht aus von einem induktiven Winkelsensor mit den im
Oberbegriff des Anspruchs 1 angegebenen Merkmalen, wie er beispielsweise aus
der
Induktive Winkelsensoren ermöglichen eine berührungslose Winkelmessung und werden deshalb in Kraftfahrzeugen zur Detektion von Klappenstellungen, beispielsweise von Drosselklappen, Drallklappen oder in Abgasrückführsystemen, verwendet. Weitere Anwendungen induktiver Winkelsensoren betreffen beispielsweise die Detektion des Zustands von Ventilen, insbesondere in der Prozess- oder Versorgungsindustrie.inductive Angle sensors allow a non-contact Angle measurement and are therefore used in motor vehicles for detection of damper positions, such as throttle valves, swirl flaps or in exhaust gas recirculation systems. Further Applications of inductive angle sensors relate to the example Detection of the condition of valves, in particular in the process or utility industry.
Bei
einem induktiven Winkelsensor wird mit einer Oszillatorschaltung
ein Wechselspannungssignal erzeugt, das in eine Sendespule eingespeist
wird, so dass in einer Empfangsspule ein von der zu messenden Winkelstellung
eines Messglieds abhän gendes Signal induziert wird. Bei
dem aus der
Nachteilig an dem bekannten Winkelsensor ist ein sehr niedriges Signalsrauschverhältnis, so dass eine äußerst aufwendige Aufbereitung des in der Empfangsspule induzierten Signals erforderlich ist.adversely at the known angle sensor is a very low signal to noise ratio, so that an extremely elaborate preparation of the in the receiver coil induced signal is required.
Aufgabe der Erfindung ist es, einen Weg aufzuzeigen, das Signalrauschverhältnis zu verbessern.task The invention is to show a way, the signal to noise ratio to improve.
Diese Aufgabe wird durch einen Winkelsensor mit den im Anspruch 1 angegebenen Merkmalen sowie durch ein Verfahren zur Messung der Winkelstellung eines beweglichen Messglieds mit den im Anspruch 14 angegebenen Merkmalen gelöst. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.These The object is achieved by an angle sensor with the specified in claim 1 Characteristics and a method for measuring the angular position a movable measuring element with the specified in claim 14 Characteristics solved. Advantageous developments of the invention are the subject of the dependent claims.
Erfindungsgemäß wird eine verbesserte magnetische Kopplung zwischen der Sendespule und der Empfangsspule und somit ein stärkeres Messsignal erreicht, indem die Sendespule zusammen mit der Oszillatorschaltung auf dem beweglichen Messglied angeordnet ist. Zur Spannungsversorgung der Oszillatorschaltung ist auf dem Messglied eine an die Oszillatorschaltung angeschlossene Versorgerspule angeordnet, in der mittels einer zweiten Sendespule, relativ zu welcher das Messglied beweglich ist, eine Versorgungswechselspannung induzierbar ist. Die Oszillatorschaltung nutzt die Versorgungswechselspannung, um das Wechselspannungssignal zu erzeugen, welches das Messsignal induziert. Auf diese Weise kann in der Empfangsspule das Messsignal in einer wesentlich erhöhten Signalfeldstärke induziert werden, so dass sich ein besseres Signalrauschverhältnis ergibt.According to the invention an improved magnetic coupling between the transmitting coil and the Reception coil and thus a stronger measurement signal reached, by putting the transmitter coil together with the oscillator circuit on the movable measuring element is arranged. To power the oscillator circuit is on the measuring element connected to the oscillator circuit Supply coil arranged in the means of a second transmitting coil, relative to which the measuring element is movable, an alternating supply voltage is inducible. The oscillator circuit uses the AC supply voltage, to generate the AC signal, which is the measurement signal induced. In this way, in the receiving coil, the measuring signal in a significantly increased signal field strength be induced, so that a better signal-to-noise ratio results.
Die auf dem Messglied angeordneten Teile eines erfindungsgemäßen Winkelsensors bilden gewissermaßen einen Transponder, der von der zweiten Sendespule abgefragt wird und dessen Antwort von der Empfangsspule als Messsignal empfangen wird.The arranged on the measuring member parts of an inventive Angle sensors effectively form a transponder that is queried by the second transmitter coil and its response from the receiving coil is received as a measurement signal.
Zur Spannungsversorgung der zweiten Sendespule kann diese an eine Erregerschaltung angeschlossen sein, die im Betrieb die Sendespule mit Wechselspannung speist.to Power supply of the second transmitter coil, this can be connected to a field circuit be connected, which in operation the transmitting coil with AC voltage fed.
Bevorzugt weicht die Frequenz der Versorgungswechselspannung von der Frequenz des Wechselspannungssignals und damit von der Frequenz des Messsignals ab. Diese Maßnahme hat den Vorteil, dass sich Störsignale, die in der Empfangsspule durch die zweite Sendespule mit der Frequenz der Versorgungswechselspannung induziert werden können, herausfiltern lassen. Bevorzugt ist die Frequenz der Versorgungswechselspannung kleiner als die Frequenz des Wechselspannungssignals, besonders bevorzugt mindestens 10mal, insbesondere mindestens 100mal kleiner. Die Frequenz der Versorgungswechselspannung kann beispielsweise zwischen 500 Hz und 500 kHz, insbesondere 1 kHz bis 100 kHz, gewählt werden. Für die Frequenz des Wechselspannungssignals ist insbesondere der Frequenzbereich von 500 kHz bis 1 GHz, insbesondere 1 MHz bis 100 MHz, vorteilhaft. Liegt beispielsweise die Frequenz der Versorgungswechselspannung im kHz-Bereich und die Frequenz des Wechselspannungssignals im MHz-Bereich, so lassen sich auf der Versorgungswechselspannung beruhende Störsignalanteile leicht von dem Messsignal trennen.Prefers the frequency of the AC supply voltage deviates from the frequency of the alternating voltage signal and thus of the frequency of the measuring signal from. This measure has the advantage that interfering signals, in the receiving coil through the second transmitting coil with the frequency the supply alternating voltage can be induced filter out. Preferably, the frequency of the AC supply voltage is smaller as the frequency of the AC signal, particularly preferred at least 10 times, in particular at least 100 times smaller. The frequency of AC supply voltage, for example, between 500 Hz and 500 kHz, in particular 1 kHz to 100 kHz, are selected. In particular, for the frequency of the AC signal the frequency range from 500 kHz to 1 GHz, in particular 1 MHz to 100 MHz, advantageous. For example, is the frequency of the AC supply voltage in the kHz range and the frequency of the AC signal in the MHz range, so can be based on the AC supply voltage based noise components slightly separate from the measurement signal.
Ein besonders einfacher Aufbau der Oszillatorschaltung lässt sich erreichen, indem das Wechselspannungssignal als Oberschwingung der Versorgungswechselspannung erzeugt wird. Bevorzugt ist deshalb das Wechselspannungssignal eine Oberschwingung der Versorgungswechselspannung.One particularly simple structure of the oscillator circuit leaves can be achieved by the AC signal as a harmonic the AC supply voltage is generated. Therefore, it is preferred the AC signal is a harmonic of the AC supply voltage.
Bevorzugt hat der Winkelsensor mehrere Empfangsspulen, relativ zu denen das Messglied beweglich ist. Indem mehrere unterschiedlich orientierte Empfangsspulen verwendet werden, lässt sich die Messgenauigkeit erhöhen. Beispielsweise können zwei Empfangsspulen verwendet werden, die quer zueinander, insbesondere rechtwinklig zueinander, nach Art eines Winkellagegebers orientiert sind.Prefers the angle sensor has several receiving coils, relative to which Measuring member is movable. By having several differently oriented Reception coils can be used, the measurement accuracy can be increase. For example, two receiving coils used, which are transverse to each other, in particular at right angles to each other, are oriented in the manner of a Winkelellagegebers.
Eine vorteilhafte Weiterbildung der Erfindung sieht vor, dass das Messsignal mit der Frequenz der Versorgungswechselspannung getriggert wird. Auf diese Weise lässt sich das Messsignal eindeutig an seiner zeitlichen Lage in Bezug auf die Phase der Versorgungswechselspannung, deren, vorzugsweise wesentlich kleinere, Frequenz unvermeidlich in geringer Stärke ebenfalls in der Empfangsspule induziert wird, identifizieren und folglich besser auswerten. Beispielsweise kann vorgesehen sein, dass die Oszillatorschaltung das Wechselspannungssignal und damit das Messsignal nur in Spannungspulsen erzeugt, deren Länge kleiner als die Periode des Versorgungswechselspannung ist und deren Beginn jeweils mit einer definierten Phase der Versorgungswechselspannung, beispielsweise dem Nulldurchgang bei abnehmender Amplitude, festgelegt ist.An advantageous development of the invention provides that the measuring signal is triggered with the frequency of the alternating supply voltage. On In this way, the measurement signal can be uniquely identified in its temporal position with respect to the phase of the AC supply voltage whose, preferably much smaller, frequency is inevitably also induced in the receiving coil at a low level, and thus better evaluated. For example, it can be provided that the oscillator circuit generates the AC signal and thus the measurement signal only in voltage pulses whose length is smaller than the period of the AC supply voltage and whose beginning is defined in each case with a defined phase of the AC supply voltage, for example the zero crossing with decreasing amplitude.
Weitere Einzelheiten und Vorteile der Erfindung werden an einem Ausführungsbeispiel unter Bezugnahme auf die beigefügte Zeichnung erläutert. Es zeigt:Further Details and advantages of the invention will become apparent on an embodiment explained with reference to the accompanying drawings. It shows:
Der
in
Die
Empfangsspulen
Die
Oszillatorschaltung
Die
zweite Sendespule
Die
Oszillatorschaltung
Die
Messfrequenz und somit die Frequenz des Wechselspannungssignals,
ist eine Oberwelle der Frequenz der Versorgungswechselspannung, also
ein ganzteiliges Vielfaches der Versorgungswechselspannung. Die
Frequenzen des Wechselspannungssignals und der Versorgungswechselspannung
können in einem großen Frequenzbereich weitgehend
beliebig gewählt werden. Günstig ist es, die Frequenz
der Versorgungswechselspannung im kHz-Bereich und die Frequenz des
Wechselspannungssignals im MHz-Bereich zu wählen. Zu einem geringen
Anteil wird von der zweiten Sendespule
Das Messsignal bzw. das von der Oszillatorschaltung erzeugte Wechselspannungssignal wird mit der Frequenz der Versorgungswechselspannung getriggert. Auf diese Weise kann die Auswerteschaltung das Messsignal durch seine zeitliche Lage zu der Frequenz der Versorgungswechselspannung eindeutig erkennen. Störeinflüsse können somit besser eliminiert und das Signalrauschverhältnis des Winkelsensors gesteigert werden.The Measuring signal or the alternating voltage signal generated by the oscillator circuit is triggered with the frequency of the supply alternating voltage. In this way, the evaluation circuit, the measurement signal by its temporal position to the frequency of the AC supply voltage clearly recognize. Disturbing influences can thus better eliminated and the signal to noise ratio of the angle sensor can be increased.
Die
asymmetrischen Empfangsspulen
- 11
- Erregerschaltungexcitation circuit
- 22
- Sendespuletransmitting coil
- 33
- Versorgerspulecatering coil
- 44
- Oszillatorschaltungoscillator circuit
- 55
- Sendespuletransmitting coil
- 66
- Auswerteschaltungevaluation
- 77
- Empfangsspulereceiving coil
- 88th
- Empfangsspulereceiving coil
- 1010
- Messgliedmeasuring element
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 10156238 A1 [0001, 0003] - DE 10156238 A1 [0001, 0003]
Claims (15)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008020325.4A DE102008020325B4 (en) | 2008-04-23 | 2008-04-23 | angle sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008020325.4A DE102008020325B4 (en) | 2008-04-23 | 2008-04-23 | angle sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102008020325A1 true DE102008020325A1 (en) | 2009-10-29 |
DE102008020325B4 DE102008020325B4 (en) | 2017-03-16 |
Family
ID=41111672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102008020325.4A Expired - Fee Related DE102008020325B4 (en) | 2008-04-23 | 2008-04-23 | angle sensor |
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DE (1) | DE102008020325B4 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013225874A1 (en) * | 2013-12-13 | 2015-06-18 | Continental Teves Ag & Co. Ohg | Inductive rotation angle sensor |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4809742A (en) * | 1988-04-18 | 1989-03-07 | Pneumo Abex Corporation | Control valve assembly including valve position sensor |
US4829247A (en) * | 1986-09-12 | 1989-05-09 | Vdo Adolf Schindling Ag | Angle sensor with inductive coil coupling |
US5625239A (en) * | 1992-06-03 | 1997-04-29 | Trw Inc. | Method and apparatus for sensing relative position between two relatively rotatable members using concentric rings |
EP0554900B1 (en) * | 1992-02-06 | 1998-08-05 | Magnet-Motor Gesellschaft für magnetmotorische Technik mbH | Electric motor with inductive position detector |
WO1999018653A1 (en) * | 1997-10-02 | 1999-04-15 | Synaptics (Uk) Limited | Motor control system |
DE10156238A1 (en) | 2001-11-15 | 2003-06-05 | Hella Kg Hueck & Co Patente Ma | Inductive angle sensor, especially for a motor vehicle |
-
2008
- 2008-04-23 DE DE102008020325.4A patent/DE102008020325B4/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4829247A (en) * | 1986-09-12 | 1989-05-09 | Vdo Adolf Schindling Ag | Angle sensor with inductive coil coupling |
US4809742A (en) * | 1988-04-18 | 1989-03-07 | Pneumo Abex Corporation | Control valve assembly including valve position sensor |
EP0554900B1 (en) * | 1992-02-06 | 1998-08-05 | Magnet-Motor Gesellschaft für magnetmotorische Technik mbH | Electric motor with inductive position detector |
US5625239A (en) * | 1992-06-03 | 1997-04-29 | Trw Inc. | Method and apparatus for sensing relative position between two relatively rotatable members using concentric rings |
WO1999018653A1 (en) * | 1997-10-02 | 1999-04-15 | Synaptics (Uk) Limited | Motor control system |
DE10156238A1 (en) | 2001-11-15 | 2003-06-05 | Hella Kg Hueck & Co Patente Ma | Inductive angle sensor, especially for a motor vehicle |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013225874A1 (en) * | 2013-12-13 | 2015-06-18 | Continental Teves Ag & Co. Ohg | Inductive rotation angle sensor |
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DE102008020325B4 (en) | 2017-03-16 |
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