EP2516967A2 - Magnetic field sensor assembly for capturing travel on movable parts - Google Patents

Magnetic field sensor assembly for capturing travel on movable parts

Info

Publication number
EP2516967A2
EP2516967A2 EP10768240A EP10768240A EP2516967A2 EP 2516967 A2 EP2516967 A2 EP 2516967A2 EP 10768240 A EP10768240 A EP 10768240A EP 10768240 A EP10768240 A EP 10768240A EP 2516967 A2 EP2516967 A2 EP 2516967A2
Authority
EP
European Patent Office
Prior art keywords
magnetic field
field sensor
magnet
sensor 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.)
Withdrawn
Application number
EP10768240A
Other languages
German (de)
French (fr)
Inventor
Wolfgang Welsch
Michael Kleinknecht
Mathias Kimmerle
Klaus Walter
Juergen Kissner
Joerg Siedentopf
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
Publication of EP2516967A2 publication Critical patent/EP2516967A2/en
Withdrawn legal-status Critical Current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
    • G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils

Definitions

  • the invention relates to a magnetic field sensor arrangement for path detection on rotationally and / or linearly moved components, in which spatial components of a magnetic field change over the path to be detected and can be detected accordingly, according to the features of claim 1. that for example in speed and position sensors, as z.
  • a rotational movement or position change is detected by a rotation or the change in position corresponding change in a magnetic field.
  • magnetic sensors known per se are generally used, which depending on the application and field of application can be Hall sensors, AMR sensors, GMR sensors, TMR sensors or, in general, XMR sensors.
  • the invention is therefore based on a magnetic field sensor arrangement for detecting the position of moving components, in which spatial components of the magnetic field of a magnetic component or magnet system on the moving component change in their direction over the path to be detected on the magnetic component and thereby the relative position A sensor can be detected accordingly.
  • the magnetic field of the magnetic component is at a predetermined angle between the axial direction and radial alignment with the direction of movement of the moving component is aligned.
  • the angular range of the detectable magnetic field directions can be up to 200 ° in the course of the path detection.
  • a magnetized component on an actuating element for. B. in vehicle braking systems, be mounted that at least in a further axis in addition to a linear direction to be detected, usually rotatable or in any other degree of freedom moves.
  • the invention is also suitable for cramped installation situations in a motor vehicle and, on the other hand, can also be used outside of vehicle brake systems in a wide variety of applications.
  • sensors with an XMR effect or Hall sensors are used, each detecting the changing in the course of the linear movement or a movement in other degrees of freedom direction of the magnetic field.
  • the angle to the linear direction of movement of the component moved in rotation is advantageously in the range of 45 ° in a preferred exemplary embodiment.
  • the magnetic circuit has at least one magnetization direction which is different from the axis of the movement direction but is not perpendicular to the axis of the movement direction. Due to this so-called oblique direction of the magnetic field, a magnetic field is generated on the sensor, which has a relatively wide measuring range with regard to the detectable directional differences of the field lines.
  • the magnetic field directions of these magnets may also differ from one another.
  • this magnetic circuit is rotationally symmetrical and is thus rotatable about the axis of the direction of movement, but without causing a change in the direction of the magnetic field on the scanning sensor during the rotation.
  • the magnetic circuit for the magnetic field sensor according to the invention thus preferably also consists of at least one magnet which is rotatable about the axis of the linear direction of motion and generates a magnetic field which continuously and monotonously changes the magnetic field direction over the linear path to be measured.
  • the magnet system can be shorter than the measuring path.
  • a relatively short magnetic field sensor with a likewise relatively short magnet system can be realized, but a relatively long measuring path (magnetic field sensor and magnet system are shorter than the measuring path) for applications with limited space can be achieved. Nevertheless, the magnetic circuit described here produces a maximum detectable change in the magnetic field orientation over the measuring path.
  • the invention can be implemented with a flexible magnet system with regard to the number of magnets, the magnetization directions (individually or in combination) and permits use in different installation spaces, in different applications and with different measurement paths. Short description of the drawing
  • FIG. 1 shows a schematic representation of a so-called oblique magnetization of two individual magnets and a sensor scanning the magnetic field direction.
  • Figure 2 is a schematic representation of a so-called oblique magnetization of a single magnet and a magnetic field scanning sensor.
  • FIG. 3 shows an exemplary embodiment of an arrangement for measuring pedal travel in a motor vehicle with a magnetic field sensor arrangement according to the invention.
  • FIG. 4 shows a detailed view of a ring magnet of the magnetic field sensor arrangement according to FIG. 3.
  • a magnetic circuit shown schematically in FIG. 1 to explain the invention consists of two individual magnets 1 and 2 whose magnetic field lines 3 and 4, which are inclined here in the preferred direction, are shown schematically.
  • the magnetic field lines 3 or 4 intersect a magnetic-field-sensitive sensor 5 (here a field line 3 in the case shown), wherein it can be seen that the direction of the respective field lines 3 or 4 depends on which relative position the sensor 5 is on the linear path 6 of the magnetic circuit is currently located. If one now uses a sensor 5, for example an XMR sensor or a Hall sensor, whose output signal is currently dependent on the direction of the intersecting magnetic field lines 3 or 4, a relative position determination between the magnetic circuit with the magnets 1, 2 is with this basic arrangement and the sensor 5 possible.
  • FIG. 2 shows a further possibility of such a position determination with a single magnet 7 which is magnetized obliquely in the preferred direction and whose magnetic Field lines 8 here in the same way as in the figure 1 depending on the direction of the cutting magnetic field lines 8 allow a relative position determination between the magnet 7 and the sensor 5.
  • FIG. 3 shows an exemplary embodiment of a magnetic field sensor arrangement according to the invention, for example for the detection of pedal travel in a vehicle brake system, in which a sensor housing 10 accommodates a magnetic-field-sensitive sensor corresponding to the sensor 5 according to the previously described figures.
  • the magnetic circuit here has two ring magnets 11 and 12, which are rotatably movable on a rotational axis 13 and along the axis of rotation 13 linearly.
  • FIG. 4 shows, as a more detailed exemplary embodiment, the ring magnet 11 (or corresponding to FIG. 12), which is magnetized here in the preferred direction 14 at an angle, for example at 45 ° to the rotation axis 13 according to FIG.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

The invention relates to a magnetic field sensor assembly for capturing travel on moved parts, wherein three-dimensional components of the magnetic field of a magnetic system on the moved part change direction over the travel (6) to be captured, and as a result the position of said components with respect to a stationary sensor (5) can be accordingly detected. On the part, which can be moved in a linear manner and in a further degree of freedom, at least one magnet (3,4; 7; 11,12; 14) is present as an integral part of the magnet system, or another magnetic part is present, the outer periphery of which is associated with at least one stationary sensor (5) sensitive to the direction of the magnetic field, said sensor being located at a predefined distance opposite of said periphery, wherein the preferred direction of the magnetic field of the magnet (3,4; 7; 11,12; 14) is oriented at a predetermined angle with respect to the travel (6) of the moved part between zero and less than 90°.

Description

Beschreibung  description
Magnetfeldsensoranordnung zur Wegerfassung an beweglichen Bauteilen Magnetic field sensor arrangement for path detection on moving components
Stand der Technik State of the art
Die Erfindung betrifft eine Magnetfeldsensoranordnung zur Wegerfassung an rotatorisch und/oder linear bewegten Bauteilen, bei der räumliche Komponenten eines magnetischen Feldes sich über dem zu erfassenden Weg ändern und entsprechend detek- tierbar sind, nach den gattungsgemäßen Merkmalen des Anspruchs 1. Es ist allgemein bekannt, dass zum Beispiel bei Drehzahl- und Positionssensoren, wie sie z. B. zur Steuerung von Motoren oder auch in Getriebe- oder Fahrdynamiksteuerungen bei Kraftfahrzeugen eingesetzt werden, eine Drehbewegung oder Positionsänderung durch eine der Drehung oder der Positionsänderung entsprechenden Veränderung eines magnetischen Feldes erfasst wird. Hierbei werden dann in der Regel an sich bekannte Magnetsensoren eingesetzt, die je nach Anwendung und Einsatzbereich Hallsensoren, AMR-Sensoren, GMR-Sensoren, TMR-Sensoren oder allgemein XMR- Sensoren sein können. The invention relates to a magnetic field sensor arrangement for path detection on rotationally and / or linearly moved components, in which spatial components of a magnetic field change over the path to be detected and can be detected accordingly, according to the features of claim 1. that for example in speed and position sensors, as z. As are used to control motors or in transmission or vehicle dynamics controls in motor vehicles, a rotational movement or position change is detected by a rotation or the change in position corresponding change in a magnetic field. In this case, magnetic sensors known per se are generally used, which depending on the application and field of application can be Hall sensors, AMR sensors, GMR sensors, TMR sensors or, in general, XMR sensors.
Es ist beispielsweise aus der EP 0 0997 706 Bl bekannt, dass zur Erfassung einer linearen Position zwischen einem magnetischen Körper und einem im Hinblick auf die Magnetisierungsrichtung magnetfeldempfindlichen Sensor, der magnetische Körper im Verlauf des zu erfassenden Weges so ausgebildet ist, dass dieser über seine Länge verteilt Magnetfeldlinien in einem variierenden Winkel zur Bewegungsrichtung aufweist. Somit kann die Position, in der sich der Sensor gegenüber dem magnetischen Körper befindet, aufgrund der jeweiligen Magnetfeldrichtung bestimmt werden. Aus der DE 199 37 206 C2 ist weiterhin bekannt, dass ein relativ zu magnetfeldempfindlichen Sensoren bewegbarerer Maßstab eine Vielzahl von einzelnen Magneten aufweist, deren Nord- und Südpole längs des Maßstabes unterschiedlich ausgerichtet sind. Es sind bisher solche Sensoranordnungen für relativ lange Messwegerfassung gebräuchlich, wobei entweder der Sensor länger ist, als der Messweg mit aufeinanderfolgenden Messelementen entlang des Messwegs oder der Messweg ist gegenüber dem Sensor relativ lang. In beiden Fällen ergeben sich oft Probleme bei der Integration in beengte Bauräume, wie es beim Einbau in Kraftfahrzeugen, zum Beispiel bei einem Pedalweggeber beim Brems- oder Gaspedal oft der Fall ist. It is known, for example, from EP 0 0997 706 B1 that for detecting a linear position between a magnetic body and a magnetic-field-sensitive sensor, the magnetic body is formed in the course of the path to be detected so that it over its length has distributed magnetic field lines at a varying angle to the direction of movement. Thus, the position in which the sensor is opposite to the magnetic body can be determined based on the respective magnetic field direction. From DE 199 37 206 C2 is also known that a relative to magnetic field-sensitive sensors movable scale has a plurality of individual magnets whose north and south poles are aligned differently along the scale. So far, such sensor arrangements are used for relatively long measuring path detection, whereby either the sensor is longer than the measuring path with successive measuring elements along the measuring path or the measuring path is relatively long with respect to the sensor. In both cases, there are often problems with the integration in confined spaces, as is often the case when installed in motor vehicles, for example in a Pedalweggeber the brake or accelerator pedal.
Offenbarung der Erfindung Disclosure of the invention
Es kann somit als eine Aufgabe der Erfindung angesehen werden, eine räumlich opti- mierte Integration einer Gebereinheit zur Wegerfassung in verschiedenen Betätigungseinrichtungen zu ermöglichen. Die Erfindung geht daher von einer Magnetfeldsensoranordnung zur Wegerfassung von bewegten Bauteilen aus, bei der räumliche Komponenten des magnetischen Feldes eines magnetischen Bauteils oder Magnetsystems am bewegten Bauteil sich in ihrer Richtung über dem zu erfassenden Weg am magne- tischen Bauteil ändern und dadurch die relative Position zu einem Sensor entsprechend detektierbar ist. Erfindungsgemäß befindet sich an dem im wesentlichen linear- oder auch drehbeweglichen Bauteil mindestens ein Magnet oder magnetisches Bauteil, dessem äußerem Umfang in einem vorgegebenen Abstand gegenüberliegend mindestens ein ortsfester magnetfeldempfindlicher Sensor zugeordnet ist, wobei das Magnet- feld des magnetischen Bauteils in einem vorgegebenen Winkel zwischen axialer und radialer Ausrichtung zur Bewegungsrichtung des bewegten Bauteils ausgerichtet ist. Der Winkelbereich der detektierbaren Magnetfeld richtungen kann hierbei im Verlauf der Wegerfassung bis zu 200° betragen. It can thus be regarded as an object of the invention to enable a spatially optimized integration of a transmitter unit for position detection in various actuating devices. The invention is therefore based on a magnetic field sensor arrangement for detecting the position of moving components, in which spatial components of the magnetic field of a magnetic component or magnet system on the moving component change in their direction over the path to be detected on the magnetic component and thereby the relative position A sensor can be detected accordingly. According to the invention, there is at least one magnet or magnetic component on the essentially linearly or rotatably movable component whose outer circumference is assigned at least one stationary magnetic field-sensitive sensor at a predetermined distance, wherein the magnetic field of the magnetic component is at a predetermined angle between the axial direction and radial alignment with the direction of movement of the moving component is aligned. The angular range of the detectable magnetic field directions can be up to 200 ° in the course of the path detection.
Beispielsweise kann bei einer Verwendung der erfindungsgemäßen Magnetfeldsen- soranordnung bei einer Pedal wegerfassung in einem Kraftfahrzeug ein magnetisiertes Bauteil auf einem Betätigungselement, z. B. bei Fahrzeugbremssystemen, montiert sein, dass sich mindestens in einer weiteren Achse zusätzlich zu einer zu detektieren- den linearen Richtung, meist drehbeweglich oder in einem sonstigen Freiheitsgrad, bewegt. Damit ist die Erfindung auch für beengte Einbausituationen in einem Kraftfahr- zeug geeignet und andererseits aber auch bei vielfältigen Applikationen auch außerhalb von Fahrzeugbremssystemen einsetzbar. For example, when using the magnetic field sensor arrangement according to the invention in a pedal position detection in a motor vehicle, a magnetized component on an actuating element, for. B. in vehicle braking systems, be mounted that at least in a further axis in addition to a linear direction to be detected, usually rotatable or in any other degree of freedom moves. Thus, the invention is also suitable for cramped installation situations in a motor vehicle and, on the other hand, can also be used outside of vehicle brake systems in a wide variety of applications.
In vorteilhafter Weise werden zur Messung der räumlichen Komponenten des magnetischen Feldes als Magnetfeldsensoren Sensoren mit Ausnutzung eines XMR -Effekts oder Hallsensoren eingesetzt, die jeweils die sich im Verlauf der linearen Bewegung oder einer Bewegung in sonstigen Freiheitsgraden sich ändernde Richtung des Magnetfeldes detektieren. Advantageously, to measure the spatial components of the magnetic field as magnetic field sensors sensors with an XMR effect or Hall sensors are used, each detecting the changing in the course of the linear movement or a movement in other degrees of freedom direction of the magnetic field.
Bei der erfindungsgemäßen Magnetfeldsensoranordnung liegt der Winkel zur linearen Bewegungsrichtung des rotatorisch bewegten Bauteils bei einem bevorzugten Ausführungsbeispiel in vorteilhafter Weise im Bereich von 45°. Damit weist der Magnetkreis mindestens eine Magnetisierungsrichtung auf, die zur Achse der Bewegungsrichtung unterschiedlich ist, aber nicht senkrecht zur Achse der Bewegungsrichtung steht. Durch diese sogenannte schräge Richtung des Magnetfeldes wird am Sensor ein Ma- gnetfeld generiert, das einen relativ weiten Messbereich hinsichtlich der detektierbaren Richtungsunterschiede der Feldlinien aufweist. Bei Verwendung von mindestens zwei Magneten können die Magnetfeldrichtungen dieser Magneten jedoch auch noch voneinander abweichen. In the case of the magnetic field sensor arrangement according to the invention, the angle to the linear direction of movement of the component moved in rotation is advantageously in the range of 45 ° in a preferred exemplary embodiment. Thus, the magnetic circuit has at least one magnetization direction which is different from the axis of the movement direction but is not perpendicular to the axis of the movement direction. Due to this so-called oblique direction of the magnetic field, a magnetic field is generated on the sensor, which has a relatively wide measuring range with regard to the detectable directional differences of the field lines. However, when using at least two magnets, the magnetic field directions of these magnets may also differ from one another.
Weist das bewegte Bauteil einen Ringmagneten auf, so ist dieser Magnetkreis rotati- onssym metrisch ausgeführt und ist damit um die Achse der Bewegungsrichtung drehbar, aber ohne eine Änderung der Magnetfeldrichtung am abtastenden Sensor bei der Drehung herbeizuführen. If the moving component has a ring magnet, then this magnetic circuit is rotationally symmetrical and is thus rotatable about the axis of the direction of movement, but without causing a change in the direction of the magnetic field on the scanning sensor during the rotation.
Der Magnetkreis für den erfindungemäßen Magnetfeldsensor besteht somit vorzugsweise auch aus mindestens einem um die Achse der linearen Bewegungsrichtung drehbeweglichen Magneten, der ein Magnetfeld generiert, das die Magnetfeldrichtung über den zu messenden linearen Weg kontinuierlich und monoton stetig verändert. Insbesondere bei langen Messwegen kann somit das Magnetsystem kürzer sein als der Messweg. The magnetic circuit for the magnetic field sensor according to the invention thus preferably also consists of at least one magnet which is rotatable about the axis of the linear direction of motion and generates a magnetic field which continuously and monotonously changes the magnetic field direction over the linear path to be measured. Thus, in particular with long measuring paths, the magnet system can be shorter than the measuring path.
Mit der Erfindung ist ein relativ kurzer Magnetfeldsensor mit einem ebenfalls relativ kurzem Magnetsystem realisierbar, wobei jedoch ein relativ langer Messweg (Magnetfeldsensor und Magnetsystem sind kürzer als der Messweg) für Applikationen mit beengtem Bauraum erreichbar ist. Trotzdem erzeugt der hier beschriebene Magnetkreis eine größtmögliche detektierbare Änderung der Magnetfeldorientierung über den Messweg. Die Erfindung ist mit einem flexibles Magnetsystem hinsichtlich der Anzahl der Magneten, der Magnetisierungsrichtungen (einzeln oder in Kombination) realisierbar und erlaubt einen Einsatz in unterschiedlichen Bauräumen, bei unterschiedlichen Applikationen und mit unterschiedlichen Messwegen. Kurze Beschreibung der Zeichnung With the invention, a relatively short magnetic field sensor with a likewise relatively short magnet system can be realized, but a relatively long measuring path (magnetic field sensor and magnet system are shorter than the measuring path) for applications with limited space can be achieved. Nevertheless, the magnetic circuit described here produces a maximum detectable change in the magnetic field orientation over the measuring path. The invention can be implemented with a flexible magnet system with regard to the number of magnets, the magnetization directions (individually or in combination) and permits use in different installation spaces, in different applications and with different measurement paths. Short description of the drawing
Ausführungsbeispiele der Erfindung werden im Folgenden anhand der Figuren der Zeichnung näher beschrieben. Es zeigen: Embodiments of the invention will be described in more detail below with reference to the figures of the drawing. Show it:
Figur 1 eine schematische Darstellung einer sogenannten Schrägmagnetisierung von zwei Einzelmagneten und einem die Magnetfeldrichtung abtastenden Sensor. 1 shows a schematic representation of a so-called oblique magnetization of two individual magnets and a sensor scanning the magnetic field direction.
Figur 2 eine schematische Darstellung einer sogenannten Schrägmagnetisierung eines Einzelmagneten und einem die Magnetfeldrichtung abtastenden Sensor. Figure 2 is a schematic representation of a so-called oblique magnetization of a single magnet and a magnetic field scanning sensor.
Figur 3 ein Ausführungsbeispiel einer Anordnung zur Pedalwegmessung bei einem Kraftfahrzeug mit einer erfindungsgemäßen Magnetfeldsensoranordnung. FIG. 3 shows an exemplary embodiment of an arrangement for measuring pedal travel in a motor vehicle with a magnetic field sensor arrangement according to the invention.
Figur 4 eine detaillierte Ansicht eines Ringmagneten der Magnetfeldsensoranordnung nach der Figur 3. FIG. 4 shows a detailed view of a ring magnet of the magnetic field sensor arrangement according to FIG. 3.
Ausführungsformen der Erfindung Embodiments of the invention
Ein in Figur 1 zur Erläuterung der Erfindung schematisch dargestellter Magnetkreis besteht aus zwei einzelnen Magneten 1 und 2, deren hier in der Vorzugsrichtung schräg verlaufendende magnetische Feldlinien 3 und 4 schematisch gezeigt sind. Die magnetischen Feldlinien 3 oder 4 schneiden einen magnetfeldempfindlichen Sensor 5 (hier im gezeigten Fall eine Feldlinie 3), wobei erkennbar ist, dass die Richtung der jeweiligen Feldlinien 3 oder 4 davon abhängig ist, in welcher relativen Position sich der Sensor 5 auf der linearen Wegstrecke 6 des Magnetkreises gerade befindet. Verwendet man nun einen Sensor 5, zum Beispiel einen XMR-Sensor oder einen Hallsensor, dessen Ausgangssignal gerade von der Richtung der schneidenden Magnetfeldlinien 3 oder 4 abhängig ist, so ist mit dieser prinzipiellen Anordnung eine relative Positionsbestimmung zwischen dem Magnetkreis mit den Magneten 1,2 und dem Sensor 5 möglich. A magnetic circuit shown schematically in FIG. 1 to explain the invention consists of two individual magnets 1 and 2 whose magnetic field lines 3 and 4, which are inclined here in the preferred direction, are shown schematically. The magnetic field lines 3 or 4 intersect a magnetic-field-sensitive sensor 5 (here a field line 3 in the case shown), wherein it can be seen that the direction of the respective field lines 3 or 4 depends on which relative position the sensor 5 is on the linear path 6 of the magnetic circuit is currently located. If one now uses a sensor 5, for example an XMR sensor or a Hall sensor, whose output signal is currently dependent on the direction of the intersecting magnetic field lines 3 or 4, a relative position determination between the magnetic circuit with the magnets 1, 2 is with this basic arrangement and the sensor 5 possible.
Figur 2 zeigt eine weitere Möglichkeit einer solchen Positionsbestimmung mit einem in der Vorzugsrichtung schräg magnetisierten Einzelmagneten 7, dessen magnetische Feldlinien 8 hier in gleicher Weise, wie bei der Figur 1 abhängig von der Richtung der schneidenden Magnetfeldlinien 8 eine relative Positionsbestimmung zwischen dem Magneten 7 und dem Sensor 5 ermöglichen. FIG. 2 shows a further possibility of such a position determination with a single magnet 7 which is magnetized obliquely in the preferred direction and whose magnetic Field lines 8 here in the same way as in the figure 1 depending on the direction of the cutting magnetic field lines 8 allow a relative position determination between the magnet 7 and the sensor 5.
In Figur 3 ist ein Ausführungsbeispiel einer erfindungsgemäßen Magnetfeldsensoran- Ordnung gezeigt, zum Beispiel für die Pedalwegerfassung in einem Fahrzeugbremssystem, bei der in einem Sensorgehäuse 10 ein magnetfeldempfindlicher Sensor entsprechend dem Sensor 5 nach den vorhergehend beschriebenen Figuren, untergebracht ist. Der Magnetkreis weist hier zwei Ringmagneten 11 und 12 auf, die auf einer Drehachse 13 drehbeweglich und längs der Drehachse 13 linear bewegbar sind. FIG. 3 shows an exemplary embodiment of a magnetic field sensor arrangement according to the invention, for example for the detection of pedal travel in a vehicle brake system, in which a sensor housing 10 accommodates a magnetic-field-sensitive sensor corresponding to the sensor 5 according to the previously described figures. The magnetic circuit here has two ring magnets 11 and 12, which are rotatably movable on a rotational axis 13 and along the axis of rotation 13 linearly.
Figur 4 zeigt als detaillierteres Ausführungsbeispiel den Ringmagneten 11 (oder entsprechend 12), der hier in der Vorzugsrichtung 14 schräg, zum Beispiel in 45° zur Drehachse 13 nach der Figur 3, magnetisiert ist. FIG. 4 shows, as a more detailed exemplary embodiment, the ring magnet 11 (or corresponding to FIG. 12), which is magnetized here in the preferred direction 14 at an angle, for example at 45 ° to the rotation axis 13 according to FIG.

Claims

Ansprüche claims
Magnetfeldsensoranordnung zur Wegerfassung an bewegten Bauteilen, bei der räumliche Komponenten des magnetischen Feldes eines Magnetsystems am bewegten Bauteil sich in ihrer Richtung über dem zu erfassenden Weg (6) ändern und dadurch deren Position gegenüber einem ortsfesten Sensor (5) entsprechend detektierbar ist, dadurch gekennzeichnet, dass an dem linear und in einem weiteren Freiheitsgrad beweglichen Bauteil sich mindestens ein Magnet (3,4;7;11,12;14) als Bestandteil des Magnetsystems oder ein sonstiges magnetisches Bauteil befindet, dessen äußerem Umfang in einem vorgegebenen Abstand gegenüberliegend mindestens ein ortsfester magnetfeldrichtungsempfindlicher Sensor (5) zugeordnet ist, wobei die Vorzugsrichtung des Magnetfeldes des Magneten (3,4;7;11,12;14) in einem vorgegebenen Winkel zum Weg (6) zwischen null und kleiner 90° des bewegten Bauteils ausgerichtet ist. Magnetic field sensor arrangement for path detection on moving components, in which spatial components of the magnetic field of a magnet system on the moving component change in their direction over the path to be detected (6) and their position relative to a stationary sensor (5) is accordingly detectable, characterized in that at least one magnet (3,4; 7; 11,12; 14) as part of the magnet system or another magnetic component is located on the component which is movable linearly and in a further degree of freedom, the outer circumference of which is at least one stationary one at a predetermined distance Magnetic field direction sensitive sensor (5) is assigned, wherein the preferred direction of the magnetic field of the magnet (3,4; 7; 11,12; 14) is aligned at a predetermined angle to the path (6) between zero and less than 90 ° of the moving component.
Magnetfeldsensoranordnung nach Anspruch 1, dadurch gekennzeichnet, dass der weitere Freiheitsgrad eine Drehbewegung um eine Drehachse (13) des beweglichen Bauteils umfasst. Magnetic field sensor arrangement according to claim 1, characterized in that the further degree of freedom comprises a rotational movement about an axis of rotation (13) of the movable component.
Magnetfeldsensoranordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der vorgegebene Winkel der Vorzugsrichtung des Magnetfeldes des Magneten (3,4;7;11,12;14) 45° beträgt. Magnetic field sensor arrangement according to claim 1 or 2, characterized in that the predetermined angle of the preferred direction of the magnetic field of the magnet (3,4; 7; 11,12; 14) is 45 °.
Magnetfeldsensoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zur Messung der räumlichen Komponenten des magnetischen Feldes der mindestens eine Magnetfeldsensor ein Sensor (5) mit Auswertung eines XMR- Effekts oder ein Hallsensor ist. Magnetic field sensor arrangement according to one of the preceding claims, characterized in that for measuring the spatial components of the magnetic field, the at least one magnetic field sensor is a sensor (5) with evaluation of an XMR effect or a Hall sensor.
Magnetfeldsensoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Mehrzahl von hinsichtlich ihrer Magnetisierung auch unterschiedlich ausgerichteter einzelner Magnete am Umfang des bewegten Bauteils angeordnet sind. Magnetic field sensor arrangement according to one of the preceding claims, characterized in that a plurality of with respect to their magnetization also differently oriented individual magnets are arranged on the circumference of the moving member.
6. Magnetfeldsensoranordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass am bewegten Bauteil mindestens ein Ringmagnet (11,12) angeordnet ist, der im Verlauf seines Umfangs eine Magnetfeld richtung auf- weist, deren Vorzugsrichtung in einem vorgegebenen Winkel zum Weg (6) zwischen null und kleiner 90° des bewegten Bauteils ausgerichtet ist. 6. magnetic field sensor arrangement according to one of claims 1 to 5, characterized in that the moving component at least one ring magnet (11,12) is arranged, which in the course of its circumference a magnetic field direction has, whose preferred direction is aligned at a predetermined angle to the path (6) between zero and less than 90 ° of the moving component.
7. Verwendung einer Magnetfeldsensoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Magnetfeldsensoranordnung bei einer Pedalwegerfassung in einem Kraftfahrzeug angewendet wird. 7. Use of a magnetic field sensor arrangement according to one of the preceding claims, characterized in that the magnetic field sensor arrangement is used in a pedal travel detection in a motor vehicle.
EP10768240A 2009-12-21 2010-10-22 Magnetic field sensor assembly for capturing travel on movable parts Withdrawn EP2516967A2 (en)

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DE200910055104 DE102009055104A1 (en) 2009-12-21 2009-12-21 Magnetic field sensor arrangement for path detection on moving components
PCT/EP2010/065925 WO2011085833A2 (en) 2009-12-21 2010-10-22 Magnetic field sensor assembly for capturing travel on movable parts

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