DE4343677A1 - Circuit for evaluating sensor measurement signals obtained with bridge circuit - Google Patents

Circuit for evaluating sensor measurement signals obtained with bridge circuit

Info

Publication number
DE4343677A1
DE4343677A1 DE19934343677 DE4343677A DE4343677A1 DE 4343677 A1 DE4343677 A1 DE 4343677A1 DE 19934343677 DE19934343677 DE 19934343677 DE 4343677 A DE4343677 A DE 4343677A DE 4343677 A1 DE4343677 A1 DE 4343677A1
Authority
DE
Germany
Prior art keywords
circuit
bridge circuit
bridge
circuit arrangement
arrangement according
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.)
Ceased
Application number
DE19934343677
Other languages
German (de)
Inventor
Matthias Schildwaechter
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.)
Continental Teves AG and Co OHG
Original Assignee
ITT Automotive Europe GmbH
Alfred Teves 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 ITT Automotive Europe GmbH, Alfred Teves GmbH filed Critical ITT Automotive Europe GmbH
Priority to DE19934343677 priority Critical patent/DE4343677A1/en
Publication of DE4343677A1 publication Critical patent/DE4343677A1/en
Ceased 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
    • G01D5/142—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 using Hall-effect devices
    • G01D5/145—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 using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
    • 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
    • G01D1/00—Measuring arrangements giving results other than momentary value of variable, of general application
    • G01D1/16—Measuring arrangements giving results other than momentary value of variable, of general application giving a value which is a function of two or more values, e.g. product or ratio
    • 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
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
    • G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/006—Details of instruments used for thermal compensation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

The bridge circuit (1) is supplied from a constant current source (2). The evaluation circuit contains a divider (4) which forms a quotient from the measurement signal (DeltaUM)and the voltage drop (UBr) across the bridge circuit. The output signal (Ua) of the divider is evaluated as the measurement parameter. The bridge circuit is a Wheatstone bridge, all of whose resistances have at least approximately the same temp. dependency of their electrical resistances. The resistances of the bridge circuit are made from the same material.

Description

Die Erfindung bezieht sich auf eine Schaltungsanordnung zur Auswertung des mit einer Brückenschaltung gewonnenen Meßsignals eines Sensors, insbesondere eine aktiven Raddrehzahlsensors.The invention relates to a circuit arrangement for the evaluation of that obtained with a bridge circuit Measurement signal from a sensor, especially an active one Wheel speed sensor.

Bekanntlich sind die Meßsignale derartiger Schaltungsanordnungen temperaturabhängig. Dies ist ein Nachteil, weil durch den Temperaturgang die Meßgenauigkeit verringert wird. Durch Auswahl bestimmter Widerstands-Werkstoffe mit relativ geringer Temperaturabhängigkeit, durch Kompensation des Temperaturgangs mit Hilfe von Widerständen mit positivem und negativem Widerstandskoeffizienten ist man bemüht, die Temperaturabhängigkeit zu eliminieren oder zumindest in tolerierbaren Grenzen zu halten. Dies wird jedoch insbesondere dann schwierig, wenn es sich um Schaltungsanordnungen für solche Sensoren handelt, die naturgemäß innerhalb eines breiten Temperaturbereichs zum Einsatz kommen; dies gilt beispielsweise für die Drehzahlsensoren eines Kraftfahrzeugs.As is known, the measurement signals are of this type Circuit arrangements depending on temperature. This is a Disadvantage, because of the temperature response, the measuring accuracy is reduced. By choosing certain Resistance materials with relatively low Temperature dependence, by compensating for the Temperature response with the help of resistors with positive and negative resistance coefficient one tries to get the Eliminate temperature dependency or at least in to keep tolerable limits. However, this will especially difficult when it comes to Circuit arrangements for such sensors naturally within a wide temperature range Come into play; this applies, for example, to the Speed sensors of a motor vehicle.

Der Erfindung liegt nun die Aufgabe zugrunde, den nachteiligen Temperaturgang einer derartigen Schaltungsanordnung zur Auswertung von Sensorsignalen mit Hilfe einer relativ einfachen Maßnahme, die ohne oder mit höchstens geringem Zusatzaufwand verwirklicht werden kann, zu überwinden. The invention is based on the object adverse temperature response of such Circuit arrangement for evaluating sensor signals with Help of a relatively simple measure, with or without at most little additional effort can be realized, to overcome.  

Es hat sich herausgestellt, daß diese Aufgabe bei einer solchen Schaltungsanordnung dadurch gelöst werden kann, daß die Brückenschaltung aus einer Konstantstromquelle versorgt wird, daß die Schaltungsanordnung einen Dividierer enthält, der einen Quotienten aus dem Meßsignal und der über der Brückenschaltung abfallenden Spannung bildet und dessen Ausgangssignal als Meßgröße ausgewertet wird.It has been found that this task with a such circuit arrangement can be solved that the bridge circuit from a constant current source is supplied that the circuit arrangement one Divider contains a quotient from the measurement signal and the voltage drop across the bridge circuit forms and its output signal is evaluated as a measured variable becomes.

Erfindungsgemäß wird also durch eine sehr einfache Maßnahme, die, wenn ohnehin eine Konstantstromquelle vorhanden ist, nur einen zusätzlichen Dividierer erfordert, die Temperaturabhängigkeit des Meßsignals eliminiert.According to the invention is therefore very simple Measure that if a constant current source anyway there is only one additional divider requires the temperature dependence of the measurement signal eliminated.

Besonders geeignet als Meßbrücke ist eine Wheatstone′sche Brückenschaltung. Alle Widerstände der Brückenschaltung bestehen zweckmäßigerweise aus dem gleichen Material, oder sie werden aus Materialien mit (annähernd) gleicher Temperaturabhängigkeit gefertigt.A Wheatstone is particularly suitable as a measuring bridge Bridge circuit. All resistances of the bridge circuit suitably consist of the same material, or they are made of materials with (approximately) the same Made temperature dependency.

Eine Schaltungsanordnung der erfindungsgemäßen Art ist ganz besonders für einen aktiven Raddrehzahlsensor geeignet, der eine Brückenschaltung aus magneto-resistiven Widerständen besitzt, die in einem in Abhängigkeit von der Meßgröße variablen Magnetfeld angeordnet sind.A circuit arrangement of the type according to the invention especially for an active wheel speed sensor suitable of a bridge circuit made of magneto-resistive Has resistances in a depending on the Measured variable variable magnetic field are arranged.

Weitere Merkmale, Vorteile und Anwendungsmöglichkeiten der Erfindung gehen aus der folgenden Beschreibung eines Ausführungsbeispiels anhand der beigefügten Abbildung hervor. Diese Abbildung zeigt in schematisch vereinfachter Darstellung die wichtigsten Komponenten einer Schaltungsanordnung nach der Erfindung. Other features, advantages and possible uses of the Invention emerge from the following description Embodiment with reference to the accompanying figure forth. This figure shows in schematically simplified Representation of the most important components of a Circuit arrangement according to the invention.  

Die dargestellte Schaltungsanordnung enthält eine Wheatstone′sche Brückenschaltung 1, deren Widerstände R₁ bis R₄ - alle oder einige - in einem Magnetfeld angeordnet sind, das in Abhängigkeit von der eigentlichen Meßgröße variabel ist. Die Widerstände R₁ bis R₄ - alle oder einige - bestehen im vorliegenden Ausführungsbeispiel aus magneto-resistivem Material, dessen Widerstand von der Höhe des Magnetfeldes abhängig ist.The circuit arrangement shown contains a Wheatstone bridge circuit 1 , the resistors R₁ to R₄ - all or some - are arranged in a magnetic field which is variable depending on the actual measured variable. The resistors R₁ to R₄ - all or some - consist in the present embodiment of magneto-resistive material, the resistance of which depends on the magnitude of the magnetic field.

Die Brückenschaltung 1 wird aus einer symbolisch angedeuteten Konstantstromquelle 2 gespeist, die den Strom Ik liefert.The bridge circuit 1 is fed from a symbolically indicated constant current source 2 , which supplies the current I k .

Die Brückenspannung ΔU, die in bekannter Weise als Meßsignal dient, wird in einem Differenzverstärker 3 aufbereitet. In einem anschließenden Dividierer 4 wird ein Quotient aus dem aufbereiteten Meßsignal ΔUM, nämlich dem Ausgangssignal des Differenzverstärkers 3, und der über der Brückenschaltung abfallenden Spannung KBr gebildet. Das Ausgangssignal UA des Dividierers 4 ist dann die (weitgehend) temperaturunabhängige Meßgröße des hier beschriebenen aktiven Raddrehzahlsensors.The bridge voltage ΔU, which serves as a measurement signal in a known manner, is processed in a differential amplifier 3 . In a subsequent divider 4 , a quotient is formed from the processed measurement signal ΔU M , namely the output signal of the differential amplifier 3 , and the voltage K Br dropping across the bridge circuit. The output signal U A of the divider 4 is then the (largely) temperature-independent measured variable of the active wheel speed sensor described here.

Die Erfindung beruht auf der Überlegung, daß bei einer Schaltungsanordnung der beschriebenen Art für das aufbereitete Meßsignal UM die BeziehungThe invention is based on the consideration that in a circuit arrangement of the type described for the processed measurement signal U M the relationship

ΔUM = ΔUMo f(Temp.) (1)ΔU M = ΔU Mo f (temp.) (1)

und für die über der Brückenschaltung 1 abfallenden Spannung UBr die Beziehungand the relationship for the voltage U Br dropping across the bridge circuit 1

UBr = Ik-Rg = Ik·Ro·f(Temp.) (2) Br U = I k = I k -R g R · O · f (Temp.) (2)

mitWith

gelten.be valid.

Der Quotient aus den Größen ΔUM und UBr, nämlich die Meßgröße UA ist folglich temperaturunabhängig.The quotient of the quantities ΔU M and U Br , namely the measured variable U A, is consequently independent of the temperature.

Claims (6)

1. Schaltungsanordnung zur Auswertung des mit einer Brückenschaltung gewonnenen Meßsignals eines Sensors, insbesondere eines aktiven Raddrehzahlsensors, dadurch gekennzeichnet, daß die Brückenschaltung (1) aus einer Konstantstromquelle (2) versorgt wird, daß die Schaltungsanordnung einen Dividierer (4) enthält, der einen Quotienten aus dem Meßsignal (ΔUM) und der über der Brückenschaltung abfallenden Spannung (UBr) bildet und dessen Ausgangssignal (Ua) als Meßgröße ausgewertet wird.1. Circuit arrangement for evaluating the measurement signal obtained with a bridge circuit from a sensor, in particular an active wheel speed sensor, characterized in that the bridge circuit ( 1 ) is supplied from a constant current source ( 2 ), that the circuit arrangement contains a divider ( 4 ) which has a quotient from the measurement signal (ΔU M ) and the voltage drop across the bridge circuit (U Br ) and whose output signal (U a ) is evaluated as a measurement variable. 2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Brückenschaltung (1) eine Wheatstone′sche Brücke ist.2. Circuit arrangement according to claim 1, characterized in that the bridge circuit ( 1 ) is a Wheatstone bridge. 3. Schaltungsanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß alle Widerstände (R₁ bis R₄) der Brückenschaltung (1) zumindest annähernd gleiche Abhängigkeit ihres elektrischen Widerstandes von der Temperatur besitzen.3. Circuit arrangement according to claim 1 or 2, characterized in that all resistors (R₁ to R₄) of the bridge circuit ( 1 ) have at least approximately the same dependence of their electrical resistance on the temperature. 4. Schaltungsanordnung nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Widerstände der (R₁ bis R₄) Brückenschaltung (1) aus dem gleichen Material gefertigt sind. 4. Circuit arrangement according to one or more of claims 1 to 3, characterized in that the resistors of the (R₁ to R₄) bridge circuit ( 1 ) are made of the same material. 5. Schaltungsanordnung nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Brückenspannung (ΔU) über einen Differenzverstärker (3) dem Dividierer (4) zugeführt wird.5. A circuit arrangement according to one or more of claims 1 to 4, characterized in that the bridge voltage (.DELTA.U) via a differential amplifier (3) to the divider (4) is supplied. 6. Schaltungsanordnung nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Brückenschaltung (1) Bestandteil eines aktiven Raddrehzahlsensors ist und aus magneto-resistiven Widerständen besteht, die in einem in Abhängigkeit von der Meßgröße variablen Magnetfeld angeordnet sind.6. Circuit arrangement according to one or more of claims 1 to 5, characterized in that the bridge circuit ( 1 ) is part of an active wheel speed sensor and consists of magnetoresistive resistors which are arranged in a variable depending on the measured variable magnetic field.
DE19934343677 1993-12-21 1993-12-21 Circuit for evaluating sensor measurement signals obtained with bridge circuit Ceased DE4343677A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19934343677 DE4343677A1 (en) 1993-12-21 1993-12-21 Circuit for evaluating sensor measurement signals obtained with bridge circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19934343677 DE4343677A1 (en) 1993-12-21 1993-12-21 Circuit for evaluating sensor measurement signals obtained with bridge circuit

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DE4343677A1 true DE4343677A1 (en) 1995-06-22

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DE19934343677 Ceased DE4343677A1 (en) 1993-12-21 1993-12-21 Circuit for evaluating sensor measurement signals obtained with bridge circuit

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307977B2 (en) * 1973-02-17 1979-09-06 Centra-Buerkle Gmbh & Co, 7036 Schoenaich Circuit arrangement with an electrical bridge
SU1099104A2 (en) * 1983-01-28 1984-06-23 Белорусское Республиканское Научно-Производственное Объединение "Центр" Device for measuring parameters on rotating object
DE3537332A1 (en) * 1984-11-09 1986-05-15 Bauakademie der Deutschen Demokratischen Republik, DDR 1092 Berlin Normalised measuring device based on a Wheatstone bridge
DE3513148A1 (en) * 1985-04-12 1986-10-23 Robert Bosch Gmbh, 7000 Stuttgart INTEGRATED SPEED SENSOR WITH MAGNETIC-DEPENDENT SENSOR RESISTORS
DE3627588A1 (en) * 1985-08-16 1987-02-19 Nippon Denso Co DEVICE FOR DETECTING MALFUNCTIONS OF A SENSOR
DE3535118A1 (en) * 1985-10-02 1987-04-09 Bosch Gmbh Robert Analog/digital converter
DE3344363C2 (en) * 1983-12-08 1989-06-22 Hartmann & Braun Ag, 6000 Frankfurt, De
DE2558956C2 (en) * 1974-12-29 1989-09-14 Sony Corp., Tokio/Tokyo, Jp
EP0549947A1 (en) * 1991-12-16 1993-07-07 SHARP Corporation A circuit for humidity detection

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307977B2 (en) * 1973-02-17 1979-09-06 Centra-Buerkle Gmbh & Co, 7036 Schoenaich Circuit arrangement with an electrical bridge
DE2558956C2 (en) * 1974-12-29 1989-09-14 Sony Corp., Tokio/Tokyo, Jp
SU1099104A2 (en) * 1983-01-28 1984-06-23 Белорусское Республиканское Научно-Производственное Объединение "Центр" Device for measuring parameters on rotating object
DE3344363C2 (en) * 1983-12-08 1989-06-22 Hartmann & Braun Ag, 6000 Frankfurt, De
DE3537332A1 (en) * 1984-11-09 1986-05-15 Bauakademie der Deutschen Demokratischen Republik, DDR 1092 Berlin Normalised measuring device based on a Wheatstone bridge
DE3513148A1 (en) * 1985-04-12 1986-10-23 Robert Bosch Gmbh, 7000 Stuttgart INTEGRATED SPEED SENSOR WITH MAGNETIC-DEPENDENT SENSOR RESISTORS
DE3627588A1 (en) * 1985-08-16 1987-02-19 Nippon Denso Co DEVICE FOR DETECTING MALFUNCTIONS OF A SENSOR
DE3535118A1 (en) * 1985-10-02 1987-04-09 Bosch Gmbh Robert Analog/digital converter
EP0549947A1 (en) * 1991-12-16 1993-07-07 SHARP Corporation A circuit for humidity detection

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BÖHNISCH, M.: Bestimmung von Wider- standsgrößen im Milliohm-Bereich. In: tm-Techni- sches Messen 60, 1993, 2, S. 47-51 *
SLEMEYER, A. *

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Owner name: CONTINENTAL TEVES AG & CO. OHG, 60488 FRANKFURT, D

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