DE2913895A1 - ANALOGUE EVALUATION FOR AN INDUCTIVE POSITIONER, ESPECIALLY FOR A SEMI-DIFFERENTIAL SHORT-RING ENCODER - Google Patents

ANALOGUE EVALUATION FOR AN INDUCTIVE POSITIONER, ESPECIALLY FOR A SEMI-DIFFERENTIAL SHORT-RING ENCODER

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Publication number
DE2913895A1
DE2913895A1 DE19792913895 DE2913895A DE2913895A1 DE 2913895 A1 DE2913895 A1 DE 2913895A1 DE 19792913895 DE19792913895 DE 19792913895 DE 2913895 A DE2913895 A DE 2913895A DE 2913895 A1 DE2913895 A1 DE 2913895A1
Authority
DE
Germany
Prior art keywords
evaluation circuit
coils
operational amplifier
inductance
rectifier
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.)
Granted
Application number
DE19792913895
Other languages
German (de)
Other versions
DE2913895C2 (en
Inventor
Albig Ing Grad Hassler
Hans Dipl Ing Kubach
Johannes Ing Grad Locher
Bernd Dipl Ing Schelling
Albrecht Dipl Ing Sieber
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
Priority to DE19792913895 priority Critical patent/DE2913895C2/en
Priority to LU81173A priority patent/LU81173A1/en
Priority to FR8006896A priority patent/FR2453393A1/en
Publication of DE2913895A1 publication Critical patent/DE2913895A1/en
Application granted granted Critical
Publication of DE2913895C2 publication Critical patent/DE2913895C2/en
Expired legal-status Critical Current

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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
    • G01D5/22—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 differentially influencing two coils
    • G01D5/2208—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 differentially influencing two coils by influencing the self-induction of the coils
    • G01D5/2225—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 differentially influencing two coils by influencing the self-induction of the coils by a movable non-ferromagnetic conductive element
    • G01D5/2233—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 differentially influencing two coils by influencing the self-induction of the coils by a movable non-ferromagnetic conductive element constituting a short-circuiting element
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2611—Measuring inductance

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Description

R. 5^06
4.4,1979 Lr/SmR. 5 ^ 06
4.4.1979 Lr / Sm

ROBERT BOSCH GMBH, 7000 Stuttgart 1ROBERT BOSCH GMBH, 7000 Stuttgart 1

Analoge Auswerteschaltung für einen induktiven Stellungsgeber, insbesondere für einen Halbdifferential-Kurzschlußringgeber Analog evaluation circuit for an inductive position transmitter, especially for a half-differential short-circuit ring transmitter

Die Erfindung betrifft eine analoge Auswerteschaltung für einen induktiven Stellungsgeber3 mit zwei auf einem gemeinsamen Eisenkern sitzenden Spulen, von denen wenigstens eine in ihrer Induktivität veränderbar ist mit Hilfe eines Kurzschlußringes, der einen der Schenkel des Eisenkerns umschließt und entlang diesem Schenkel in Abhängigkeit von dem zu messenden "Weg verstellbar ist. Bei einem solchen Weggeber ändert sich die Induktivität der Spule, wenn der Kurzschlußring auf dem zu dieser Spule gehörenden Schenkel des Eisenkerns, beispielsweise in Abhängigkeit vom Verstellweg einer den Unterdruck im Ansaugrohr einer Brennkraftmaschine messenden Membrandose oder einer im Ansaugrohr angeordneten Stauklappe zur Messung der Ansaugluftmenge verstellt wird.The invention relates to an analog evaluation circuit for an inductive position transmitter 3 with two coils seated on a common iron core, at least one of which can be changed in its inductance with the aid of a short-circuit ring which surrounds one of the legs of the iron core and along this leg depending on the With such a displacement transducer, the inductance of the coil changes when the short-circuit ring on the leg of the iron core belonging to this coil, for example depending on the adjustment path of a diaphragm box measuring the negative pressure in the intake pipe of an internal combustion engine or a damper located in the intake pipe is adjusted to measure the intake air volume.

Der Erfindung liegt die Aufgabe zugrunde, eine möglichst einfach aufgebaute Auswerteschaltung zu schaffen, mit welcher die sich wegabhängig ändernde Induktivität der Spule in einen analogen elektrischen Wert, insbesondere in eine analoge Spannung umgewandelt werden kann. Zur Lösung dieser Aufgabe ist für die Auswerteschaltung die im Kennzeichen des Patentanspruchs 1 angegebene Merkmalskombination vorgesehen.The invention is based on the object of creating an evaluation circuit that is as simple as possible and with which the inductance of the coil, which changes as a function of travel, into an analog electrical value, in particular into an analog one Voltage can be converted. To solve this problem is for the evaluation circuit in the characterizing part of the claim 1 specified combination of features is provided.

030042/0354 .030042/0354.

R. 5406 Lr/SmR. 5406 Lr / Sm

In der Zeichnung ist ein Ausführungsbeispiel einer solchen Auswerteschaltung in ihrem Schaltbild dargestellt und nachstehend im einzelnen näher erläutert.In the drawing, an embodiment of such an evaluation circuit is shown in its circuit diagram and below explained in more detail.

Die erfindungsgemäße Auswerteschaltung dient dazu, die in Abhängigkeit von der Bewegung eines Bauteils einer nicht dargestellten Brennkraftmaschine, beispiels.weise der Drehbewegung einer im Ansaugrohr der Brennkraftmaschine angeordneten Stauklappe veränderbare Induktivität Ls der Meßspule 3 des Gebers in eine analoge, am Ausgang A der Auswerteschaltung abgreifbare Spannung umzuwandeln und dabei die Induktivität Ls der Meßspule ins Verhältnis zu einer Referenz-Induktivität Ls einer Vergleichsspule 2 zu setzen, welche zur Vermeidung von äußeren Einflüssen auf dem gleichen Eisenkern wie die Heßspule 3 angeordnet ist.The evaluation circuit according to the invention is used to determine the, as a function of the movement of a component of a not shown Internal combustion engine, for example the rotary movement of an arranged in the intake manifold of the internal combustion engine Damper variable inductance Ls of the measuring coil 3 des To convert the encoder into an analog voltage that can be tapped off at output A of the evaluation circuit, thereby reducing the inductance Ls of the measuring coil in relation to a reference inductance Ls to set a comparison coil 2, which to avoid external influences on the same iron core as the Hessspule 3 is arranged.

Kernstück der erfindungsgemäßen Auswerteschaltung ist ein amplituden-stabiler Clapposzillator von der Art, wie er im Prinzip in der DE-PS 20 08 902 (H 03 b, 3/02) angegeben ist. Der nur geringfügig abgewandelte, verbesserte Oszillator 1 nach der Zeichnung enthält zwei komplementäre, zueinander in Reihe geschaltete Transistoren, nämlich einen ersten Transistor Tl vom npn-Typ, der mit seinem Kollektor unmittelbar an eine gemeinsame, Pluspotential führende Betriebsstromleitung 4 angeschlossen ist, und einen zweiten Transistor T2 vom pnp-Typ, der mit seinem Kollektor an eine durchgehende Minusleitung 5 angeschlossen ist. Die Emitter der beiden Transistoren sind durch zwei gleichgroße Emitter-Vorwiderstände 6 und 7 verbunden. An den Verbindungspunkt 8 dieser Widerstände sind zwei zur Rückkopplung und Spannungsteilung dienende Kondensatoren 10 und 11 angeschlossen, von denen der Kondensator mit der Minusleitung 5 und der Kondensator 10 mit der Basis des ersten Transistor Tl verbunden ist, welche außerdem über einen Widerstand 12 mit der Plusleitung 4 und über einen weiteren Kondensator 13 mit der Basis des zweiten Transistors T2 ver-The core of the evaluation circuit according to the invention is a amplitude-stable Clapposcillator of the type as indicated in principle in DE-PS 20 08 902 (H 03 b, 3/02). The only slightly modified, improved oscillator 1 according to the drawing contains two complementary ones series-connected transistors, namely a first transistor Tl of the npn type, which with its collector directly is connected to a common, positive potential leading operating power line 4, and a second transistor T2 from PNP type, which is connected to a continuous negative line 5 with its collector. The emitters of the two transistors are connected by two emitter series resistors 6 and 7 of the same size. At the connection point 8 of these resistors are two capacitors 10 and 11 serving for feedback and voltage division are connected, of which the capacitor is connected to the negative line 5 and the capacitor 10 to the base of the first transistor Tl, which also has a resistor 12 to the positive line 4 and via a further capacitor 13 to the base of the second transistor T2

0300A2/03540300A2 / 0354

—3— R. 5406-3- R. 5406

Lr/SmLr / Sm

bunden ist, die über einen Widerstand 14 an der Minusleitung liegt.is tied, which is connected via a resistor 14 to the negative line lies.

Die beiden Spulen 2 und 3 sind zueinander in Reihe geschaltet und bilden zusammen mit einem an die Basis des ersten Transistors Tl angeschlossenen Kondensator 15 einen Reihenschwingkreis , dessen Resonanzfrequenz von der Kapazität dieses Serienkondensators 15 und der Induktivität der beiden Spulen 2 und 3 abhängt.The two coils 2 and 3 are connected in series with one another and, together with one, form the base of the first transistor Tl connected capacitor 15 a series resonant circuit, the resonance frequency of the capacitance of this Series capacitor 15 and the inductance of the two coils 2 and 3 depends.

Zur Erzielung einer hohen Genauigkeit bei der Auswertung der variablen Induktivität Ls ist für den Oszillator 1 eine Amplitudenstabilisierung vorgesehen, welche dadurch erreicht wird, daß die an der Referenzspule 2 entstehende, sinusförmige Teilspannung einem ersten Spitzengleichrichter 16 zugeführt ist, an dessen amplitudenabhängiger Ausgangsspannung ein Regler 17 liegt, welcher einen Operationsverstärker 18 enthält, dessen Ausgangsspannung über einen Widerstand 19 und eine Diode 20 der Basis des zweiten Transistors T2 derart zugeführt ist, daß bei allen vorkommenden Betriebszuständen die an der Referenzspule 2 entstehende Teilspannung unabhängig von der jeweiligen Größe der Meßinduktivität Ls der Meßspule konstant bleibt.To achieve a high level of accuracy when evaluating the variable inductance Ls, a Amplitude stabilization is provided, which is achieved in that the sinusoidal shape produced at the reference coil 2 Partial voltage is fed to a first peak rectifier 16, at whose amplitude-dependent output voltage a regulator 17 is located which contains an operational amplifier 18, the output voltage of which is via a resistor 19 and a diode 20 is fed to the base of the second transistor T2 in such a way that in all operating states that occur the partial voltage occurring at the reference coil 2 regardless of the respective size of the measuring inductance Ls of the measuring coil remains constant.

Die an der Referenzspule 2 abgenommene Oszillator-Teilspannung wird dem Plus-Eingang des zum Gleichrichter 16 gehörenden Operationsverstärker 21, der wie die übrigen Operationsverstärker der Auswerteschaltung vom Typ MC 3302 sein kann, über einen Widerstand 22 zugeführt. Damit durch negative Spannungswerte am Plus-Eingang kein Schaden im Operationsverstärker entstehen kann, ist der Pluseingang durch eine Diode 23 geschützt, welcher ein Kondensator 24 parallel liegt. Vom Ausgang des Operationsverstärkers 21 führt eine weitere Diode 25 zu einem Widerstand 26 mit parallelgeschaltetemThe oscillator partial voltage taken from the reference coil 2 becomes the plus input of the operational amplifier 21 belonging to the rectifier 16, which like the other operational amplifiers the evaluation circuit can be of the MC 3302 type, supplied via a resistor 22. So by negative Voltage values at the plus input no damage in the operational amplifier can arise, the positive input is protected by a diode 23, which is a capacitor 24 in parallel. From the output of the operational amplifier 21, another diode 25 leads to a resistor 26 with a parallel-connected

0300A2/03SA . /1} 0300A2 / 03SA. /1}

R. 5^06R. 5 ^ 06

Lr/SmLr / Sm

Glättungskondensator 27 und über einen Vorwiderstand 28 zum Plus-Eingang des zum Regler 17 gehörenden zweiten Operationsverstärkers 18, bei welchem der Plus-Eingang durch einen Integrationskondensator 29 mit dessen Ausgang und einem weiteren, an die Minusleitung 5 angeschlossenen Kondensator 30 sowie dem zum Transistor T2 führenden Widerstand 19 verbunden ist.Smoothing capacitor 27 and via a series resistor 28 to the plus input of the second operational amplifier belonging to the controller 17 18, in which the plus input is connected to an integration capacitor 29 with its output and another, capacitor 30 connected to negative line 5 and the resistor 19 leading to the transistor T2 is connected.

Die von der jeweiligen Größe der Induktivität Ls der Meßspule 3 abhängige Oszillatorspannung wird unmittelbar hinter dem Serienkondensator 15 über einen von zwei Spannungsteilerwiderständen 31j 32 dem durch eine Diode 35 geschützten Plus-Eingang eines dritten Operationsverstärkers 33 zugeführt, der das Kerntüek eines zweiten Gleichrichters 3^ bildet. An den Ausgang des Operationsverstärkers 33 ist über eine weitere Diode 36 ein Integrierkondensator 37 angeschlossen, an welchem bei parallelgeschaltetem Entladewiderstand 38 die zur Größe der jeweiligen, stellungsabhängigen Induktivität Ls proportionale, am Ausgang A abnehmbare Ausgangsspannung entsteht.That depends on the respective size of the inductance Ls of the measuring coil 3 dependent oscillator voltage is immediately behind the series capacitor 15 via one of two voltage divider resistors 31j 32 the plus input protected by a diode 35 a third operational amplifier 33, which forms the core of a second rectifier 3 ^. To the An integrating capacitor 37 is connected to the output of the operational amplifier 33 via a further diode 36, to which when the discharge resistor 38 is connected in parallel, the value proportional to the size of the respective position-dependent inductance Ls, at output A, a detachable output voltage arises.

Der besondere Vorteil der erfindungsgemäßen Auswerteschaltung besteht darin, daß die Oszillatorspannung trotz einer geringen Batteriespannung von beispielsweise +5V an der Plusleitung h bis auf Spitzenwerte von etwa 15 V ansteigen kann und demgemäß gegenüber den beim Betrieb auf Kraftfahrzeugen unvermeidbaren Störwellen ein sehr gutes Verhältnis zwischen Nutz- und Störspannungen erzielt werden kann.The particular advantage of the evaluation circuit according to the invention is that the oscillator voltage can rise to peak values of about 15 V despite a low battery voltage of, for example, + 5V on the positive line h and accordingly a very good ratio between useful and interference voltages can be achieved.

030042/0364030042/0364

Claims (4)

R. 5406
4.4.1979 Lr/SmR. 5406
4.4.1979 Lr / Sm ROBERT BOSCH GMBH, 7000 Stuttgart 1ROBERT BOSCH GMBH, 7000 Stuttgart 1 AnsprücheExpectations l.\ Analoge Auswerteschaltung für einen induktiven Weggeber mit zwei auf einem gemeinsamen Eisenkern sitzenden Spulen, von denen wenigstens eine in ihrer Induktivität veränderbar ist mit Hilfe eines Kurζschlußringes, der einen der Schenkel des Eisenkerns umschließt und entlang diesem Schenkel in Abhängigkeit von dem zu messenden Weg verstellbar ist, dadurch gekennzeichnet, daß in der Auswerteschaltung ein Clapp-Oszillator (Tl, T2) vorgesehen ist, dessen Schwingkreis wenigstens die beiden in Reihe liegenden Spulen (2, 3) und einen Serien-Kondensator (C3) enthält, und daß ein als Regler (17) arbeitender Operationsverstärker (18) vorgesehen ist, mit dem die Schwingungsamplitude an wenigstens einer der Spulen (2, 3) konstant gehalten wird, und mit einem zweiten, an den Serienkondensator (C3) und die andere der beiden Spulen an-l. \ Analog evaluation circuit for an inductive displacement encoder with two coils sitting on a common iron core, at least one of which can be changed in its inductance is with the help of a short ring, one of the legs of the iron core and is adjustable along this leg depending on the path to be measured, thereby characterized in that a Clapp oscillator (Tl, T2) is provided in the evaluation circuit, the resonant circuit of which at least contains the two in series coils (2, 3) and a series capacitor (C3), and that a controller (17) working operational amplifier (18) is provided, with which the oscillation amplitude on at least one of the coils (2, 3) is kept constant, and with a second, connected to the series capacitor (C3) and the other of the two coils. ..12...12. 030042/0354030042/0354 ORIGINAL INSPECTEDORIGINAL INSPECTED - 2 - R. 5^06- 2 - R. 5 ^ 06 Lr/SmLr / Sm geschlossenem als Gleichrichter arbeitenden Operationsverstärker (33)j an dessen Ausgang ein Kondensator (37) angeschlossen ist, dessen Spannung (U.) die Information über den Weg liefert.closed operational amplifier working as a rectifier (33) j at the output of a capacitor (37) is connected, the voltage (U.) of the information about the Way delivers. 2. Auswerteschaltung nach Anspruch 1, dadurch gekennzeichnet, daß dem Regler (17) eine Gleichrichterstufe (16) vorgeschaltet ist, wobei an dein Eingang dieser Stufe diejenige (2) der beiden Spulen (2, 3) angeschlossen ist, die auf eine feste Referenz-Induktivität (Lr) eingestellt ist.2. Evaluation circuit according to claim 1, characterized in that that the controller (17) is preceded by a rectifier stage (16), with the one (2) of the at your input of this stage two coils (2, 3) is connected, which is set to a fixed reference inductance (Lr). 3. Auswerteschaltung nach Anspruch 2, dadurch gekennzeichnet, daß die Gleichrichterstufe (16) einen Operationsverstärker (21) enthält, an dessen Pluseingang die Referenz-Induktivität (Lr) angeschlossen ist.3. Evaluation circuit according to claim 2, characterized in that the rectifier stage (16) is an operational amplifier (21), to whose positive input the reference inductance (Lr) is connected. 4. Auswerteschaltung nach Anspruch 3, dadurch gekennzeichnet, daß das freie Ende der Spule (3) mit veränderlicher Induktivität (Ls) an den Pluseingang des zum Ausgangsgleichrichter (34) gehörenden Operationsverstärkers (33) angeschlossen ist.4. Evaluation circuit according to claim 3, characterized in that that the free end of the coil (3) with variable inductance (Ls) to the positive input of the to the output rectifier (34) belonging operational amplifier (33) is connected. 030042/0354030042/0354
DE19792913895 1979-04-06 1979-04-06 Circuit arrangement for an inductive displacement encoder Expired DE2913895C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19792913895 DE2913895C2 (en) 1979-04-06 1979-04-06 Circuit arrangement for an inductive displacement encoder
LU81173A LU81173A1 (en) 1979-04-06 1979-04-20 ANALOG EVALUATION CIRCUIT FOR AN INDUCTIVE POSITION SENSOR, IN PARTICULAR FOR A SEMI-DIFFERENTIAL SHORT CIRCUIT SENSOR
FR8006896A FR2453393A1 (en) 1979-04-06 1980-03-27 Inductive position sensor evaluation circuit - has stabilised oscillator containing fixed and variable inductance coils with voltage regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792913895 DE2913895C2 (en) 1979-04-06 1979-04-06 Circuit arrangement for an inductive displacement encoder

Publications (2)

Publication Number Publication Date
DE2913895A1 true DE2913895A1 (en) 1980-10-16
DE2913895C2 DE2913895C2 (en) 1986-07-10

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ID=6067638

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19792913895 Expired DE2913895C2 (en) 1979-04-06 1979-04-06 Circuit arrangement for an inductive displacement encoder

Country Status (3)

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DE (1) DE2913895C2 (en)
FR (1) FR2453393A1 (en)
LU (1) LU81173A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897794A (en) * 1987-07-21 1990-01-30 Egg Co., Ltd. Impulse coil tester
DE3903278A1 (en) * 1989-02-03 1990-08-09 Rexroth Mannesmann Gmbh SUPPLY OF INDUCTIVE SENSORS
DE10031237A1 (en) * 2000-06-27 2002-01-31 Daimler Chrysler Ag Electromagnetic actuator for gas exchange valve of internal combustion engine, has resonance circuit which is operated at frequency which is close but unequal to its resonance frequency

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2008902C3 (en) * 1970-02-26 1973-09-20 Robert Bosch Gmbh, 7000 Stuttgart Amplitude-stable sine oscillator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2008902C3 (en) * 1970-02-26 1973-09-20 Robert Bosch Gmbh, 7000 Stuttgart Amplitude-stable sine oscillator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897794A (en) * 1987-07-21 1990-01-30 Egg Co., Ltd. Impulse coil tester
DE3903278A1 (en) * 1989-02-03 1990-08-09 Rexroth Mannesmann Gmbh SUPPLY OF INDUCTIVE SENSORS
DE10031237A1 (en) * 2000-06-27 2002-01-31 Daimler Chrysler Ag Electromagnetic actuator for gas exchange valve of internal combustion engine, has resonance circuit which is operated at frequency which is close but unequal to its resonance frequency
DE10031237C2 (en) * 2000-06-27 2003-08-14 Daimler Chrysler Ag Electromagnetic actuator, in particular for actuating a gas exchange valve of an internal combustion engine

Also Published As

Publication number Publication date
DE2913895C2 (en) 1986-07-10
LU81173A1 (en) 1979-12-06
FR2453393A1 (en) 1980-10-31
FR2453393B3 (en) 1982-01-29

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