WO1998013668A1 - Sensor system for locating mobile elements - Google Patents

Sensor system for locating mobile elements Download PDF

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Publication number
WO1998013668A1
WO1998013668A1 PCT/DE1997/001770 DE9701770W WO9813668A1 WO 1998013668 A1 WO1998013668 A1 WO 1998013668A1 DE 9701770 W DE9701770 W DE 9701770W WO 9813668 A1 WO9813668 A1 WO 9813668A1
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WIPO (PCT)
Prior art keywords
hall sensor
control magnet
sensor
measuring voltage
pole
Prior art date
Application number
PCT/DE1997/001770
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German (de)
French (fr)
Inventor
Ansgar Grass
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.)
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Publication of WO1998013668A1 publication Critical patent/WO1998013668A1/en

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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
    • G01D5/142—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

Definitions

  • the invention is based on a sensor arrangement for detecting the position of movable parts with a Hall sensor and a control magnet that can be moved relative to it according to the preamble of the main claim.
  • a Hall sensor system is already known (EP-OS-505 372) with which positions, angular positions and distances can be detected. If a control magnet is brought close to the Hall sensor, an increasing measuring voltage is generated in it due to the increasing magnetic field. The approach of the control magnet can be recorded digitally with the aid of a downstream threshold level. Hall sensors are used as Hall switches for position detection of moving parts.
  • the relatively flat rising edge of the measuring voltage has a disadvantageous effect on the position determination of the movable part. Since the threshold value level switches between a minimum and a maximum value of the measuring voltage in the area of the flank, the position of the to be moved is Partly only detectable in a relatively wide position range of the control magnet.
  • the aim of the present solution is to have the edge of the measuring voltage signal rise more quickly and thus to increase the accuracy in the position detection of the part to be moved.
  • the sensor arrangement according to the invention with the characterizing features of the main claim has the advantage of changing the arrangement of the control magnet compared to the Hall sensor when the control magnet moves past the Hall sensor to produce a changed measuring voltage signal with a steep flank, so that the downstream threshold value stage more precisely a specific position of the control magnet and thus the part to be moved to trigger a switching operation.
  • Control magnet for the Hall sensor is precisely detectable. Another advantage is the use of an SMD Hall sensor for cost-effective production.
  • FIG. 1 shows a sketch of a motor vehicle windshield wiper with a drive motor, a spur gear, a transmission, at least one wiper arm and a Hall sensor designed as a parking position sensor,
  • Figure 2 shows a sensor arrangement with a Hall sensor
  • FIG. 1 shows a windshield wiper system for a motor vehicle with a windshield 10 partially shown, the windshield wiper system consisting of two wiper levers 12, 14, which transmit power by means of a normal wiper linkage 16 and a 4-link wiper linkage 18 with the spur gear 20 of a worm gear 21 with a drive motor 22 are connected.
  • Wiper blades 13, 15 are assigned to wiper levers 12, 14.
  • the position of the parking position sensor 24, which detects the parking position 26 of the wiper blades 13, 15, is indicated on the circumference of the spur gear 20.
  • the delimitation of the wiper surface 28 of both wiper blades 13, 15 on the windshield 10 is sketched with a semicolon.
  • signal processing arrangement which is either integrated in the Hall sensor (digital Hall sensor), designed as a separate component or integrated in a wiper control known per se.
  • FIG. 2 shows the structure of the sensor arrangement according to the invention, designed as a parking position sensor 24. It contains a unipolar Hall sensor 30 and a control magnet 32.
  • the control magnet 32 is fastened to the rotatable spur gear 20 of the drive motor 22 on the outer edge, so that when the spur gear 20 rotates in the direction of the arrow, the north pole N and subsequently the south pole S of the control magnet 32 first Hall sensor 30, which is spatially fixed to the transmission housing, is guided past.
  • the drawn magnetic field lines 34 emerge at the north pole N and enter at the south pole S. Their direction is indicated by arrowheads.
  • FIG. 3 shows a measurement voltage signal U M generated by the arrangement according to the invention as shown in FIG. 2 plotted over the path x of the control magnet 32 attached to the spur gear 20 approach, wipe over the parking position 26 and move on in the wiping direction. The moves at the same time
  • Control magnet 32 to the Hall sensor 30 and past it.
  • the measuring voltage signal U M of the Hall sensor 30 first deflects in the negative direction and then in the positive direction.
  • the amplitude of the deflection depends, among other things, on the magnetic field strength 34 that acts in the Hall sensor 30.
  • the position of the control magnet 32 with respect to the Hall sensor 30 at maximum negative deflection corresponds approximately to that position shown in Figure 2. As the distance between control magnet 32 and Hall sensor 30 increases, the deflection approaches zero.
  • two limit values U Mmin , U M max are specified for the switching process. Positions xl, x2 of the control magnet 32 are assigned to these limit values.
  • the windshield 10 is wiped and / or cleaned within the wiping surface 28.
  • the wiper blades 13, 15 are to be deposited in the parking position 26.
  • the parking position 26 of the wiper blades 13, 15 is detected by the parking position sensor 24 according to the invention, in that the measuring voltage signal U M of the parking position sensor 24 is forwarded to a signal-evaluating arrangement known per se, which evaluates the measuring voltage signal U M and switches off the drive motor 22 in the parking position 26 or stops.
  • the control magnet 32 fastened on the spur gear 20 of the motor 22 also approaches the Hall sensor 30.
  • the magnetic field 34 of the control magnet 32 penetrates the
  • Hall sensor 30 Since the control magnet 32 first approaches the Hall sensor 30 with its north pole N, the component of the magnetic field 34a perpendicular to the Hall sensor surface induces a negative measuring voltage U M in the Hall sensor 30, which leads to the signal processing arrangement. If the south pole S of the control magnet 32 comes into the effective range of the Hall sensor 30, the Hall sensor surface is covered with a flooded oppositely directed magnetic field 34b, which induces a positive measuring voltage U M. The change in direction of the magnetic field 34 causes a change in the sign of the measuring voltage U M in the transition region and causes a steep and rapid voltage rise before and after
  • the sensor arrangement can be used for position detection of wiper blades. So z. B. with arrangement of the sensor arrangement on reciprocating parts of the wiper system, the upper and lower reversal of the wipers can be detected during wiping and switched off, stopped or reversed via a control of the drive motor.
  • the sensor arrangement according to the invention is used wherever positions, angular positions, distances and sizes derived therefrom, such as. B. speed to be determined. Accurate counting devices can also be obtained with a control.
  • the sensor arrangement according to the invention can be implemented by analog or digital Hall sensor components, which can be attached to a printed circuit board using SMD technology. Depending on the intended use, unipolar or bipolar Hall sensors can be used.

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  • 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)

Abstract

The present invention relates to a sensor system (24) intended for locating moveable elements (20), preferably for retrieving a parking place by means of a windscreen wiper (12, 14). The sensor is used for making the edge of the voltage test signal (UM) steeper, thereby reducing the lack of accuracy when determining the location of the moveable element (20). The inventive system (24) includes a Hall sensor (30) and a control magnet (32) mobile relative to said captor and preferably so mounted on a rotating part (30) that, in case of relative motion by the mobile element (20) in the direction of movement, the control magnet (32) gets closer to the Hall sensor, aided by the attractive force first from the magnetic north pole (N) and then from the magnetic south pole.

Description

Sensoranordnung zur Positionserfassung von bewegbaren TeilenSensor arrangement for position detection of moving parts
Stand der TechnikState of the art
Die Erfindung geht aus von einer Sensoranordnung zur Positionserfassung von bewegbaren Teilen mit einem Hallsensor und einem relativ dazu bewegbaren Steuermagneten nach dem Oberbegriff des Hauptanspruchs. Es ist bereits ein Hallsensorsystem bekannt (EP-OS-505 372), mit dem Positionen, Winkelstellungen und Abstände erfaßt werden können. Wird ein Steuermagnet in die Nähe des Hallsensors gebracht, so wird in diesem, infolge des sich vergrößernden Magnetfelds, eine ansteigende Meßspannung erzeugt. Mit Hilfe einer nachgeschalteten Schwellwertstufe kann die Annäherung des Steuermagneten digital erfaßt werden. So werden Hallsensoren als Hallschalter zur Positionserfassung bewegbarer Teile eingesetzt.The invention is based on a sensor arrangement for detecting the position of movable parts with a Hall sensor and a control magnet that can be moved relative to it according to the preamble of the main claim. A Hall sensor system is already known (EP-OS-505 372) with which positions, angular positions and distances can be detected. If a control magnet is brought close to the Hall sensor, an increasing measuring voltage is generated in it due to the increasing magnetic field. The approach of the control magnet can be recorded digitally with the aid of a downstream threshold level. Hall sensors are used as Hall switches for position detection of moving parts.
Nachteilig wirkt sich die relativ flach ansteigende Flanke der Meßspannung auf die Positionsbestimmung des bewegbaren Teiles aus. Da die Schwellwertstufe im Bereich der Flanke zwischen einem minimalen und einem maximalen Wert der Meßspannung schaltet ist die Position des zu bewegenden Teils nur in einem relativ weiten Positionsbereich des Steuermagneten erfaßbar.The relatively flat rising edge of the measuring voltage has a disadvantageous effect on the position determination of the movable part. Since the threshold value level switches between a minimum and a maximum value of the measuring voltage in the area of the flank, the position of the to be moved is Partly only detectable in a relatively wide position range of the control magnet.
Mit der vorliegenden Lösung wird angestrebt, die Flanke des Meßspannungssignals schneller ansteigen zu lassen und damit die Genauigkeit bei der Positionserfassung des zu bewegenden Teils zu erhöhen.The aim of the present solution is to have the edge of the measuring voltage signal rise more quickly and thus to increase the accuracy in the position detection of the part to be moved.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Sensoranordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil durch die veränderte Anordnung des Steuermagneten gegenüber dem Hallsensor bei Vorbeibewegen des Steuermagneten am Hallsensor ein verändertes Meßspannungssignal mit steiler Flanke zu erzeugen, so daß die nachgeschaltete Schwellwertstufe genauer eine bestimmte Position des Steuermagneten und damit des zu bewegenden Teils zur Auslösung eines Schaltvorganges erfaßt.The sensor arrangement according to the invention with the characterizing features of the main claim has the advantage of changing the arrangement of the control magnet compared to the Hall sensor when the control magnet moves past the Hall sensor to produce a changed measuring voltage signal with a steep flank, so that the downstream threshold value stage more precisely a specific position of the control magnet and thus the part to be moved to trigger a switching operation.
Durch die in den Unteransprüchen aufgeführten Maßnahmen ergeben sich vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale. Besonders vorteilhaft ist, daß bei der Relativbewegung des Steuermagneten zum Hallsensor die induzierte Meßspannung von negativen zu positiven Vorzeichen wechselt, wenn der Steuermagnet zuerst mit seinem Nordpol, nachfolgend mit seinem Südpol dem Hallsensor angenähert wird. Durch den Vorzeichenwechsel der Meßspannung wird die Flanke an dieser Position sehr steil, so daß diese Position desThe measures listed in the subclaims result in advantageous developments and improvements of the features specified in the main claim. It is particularly advantageous that during the relative movement of the control magnet to the Hall sensor, the induced measuring voltage changes from negative to positive sign if the control magnet is first approached with its north pole and subsequently with its south pole to the Hall sensor. By changing the sign of the measuring voltage, the edge at this position becomes very steep, so that this position of the
Steuermagneten zum Hallsensor genau erfaßbar ist. Ein weiterer Vorteil ist die Verwendung eines SMD- Hallsensors für eine kostengünstige Fertigung.Control magnet for the Hall sensor is precisely detectable. Another advantage is the use of an SMD Hall sensor for cost-effective production.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen,An embodiment of the invention is shown in the drawing and explained in more detail in the following description. Show it,
Figur 1 eine Skizze eines Kraftfahrzeugscheibenwischers mit einem Antriebsmotor, einem Stirnrad, einem Getriebe, mindestens einem Wischarm und einen als Parklagensensor ausgebildeten Hallsensor,FIG. 1 shows a sketch of a motor vehicle windshield wiper with a drive motor, a spur gear, a transmission, at least one wiper arm and a Hall sensor designed as a parking position sensor,
Figur 2 eine Sensoranordnung mit einem Hallsensor und einemFigure 2 shows a sensor arrangement with a Hall sensor and
Steuermagneten für eine Scheibenwischanlage nach Figur 1, Figur 3 ein Meßspannungssignal des Hallsensors beiControl magnets for a windshield wiper system according to Figure 1, Figure 3 in a measurement voltage signal of the Hall sensor
Vorbeibewegen des Steuermagneten am Hallsensor.Moving the control magnet past the Hall sensor.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Figur 1 zeigt eine Scheibenwischanlage für ein Kraftfahrzeug mit teilweise dargestellter Windschutzscheibe 10, wobei die Scheibenwischanlage aus zwei Wischhebeln 12, 14 besteht, die mittels eines normalen Wischgestänges 16 und eines 4 -Gelenk- Wischgestänges 18 mit dem Stirnrad 20 eines Schneckengetriebes 21 mit Antriebsmotor 22 kraftübertragend verbunden sind. Den Wischhebeln 12, 14 sind Wischerblätter 13, 15 zugeordnet. Am Umfang des Stirnrads 20 ist die Position des Parklagensensors 24 angedeutet, der die Parklage 26 der Wischerblätter 13, 15 erfaßt. Mit Strichpunkt skizziert ist die Begrenzung der Wischfläche 28 beider Wischerblätter 13, 15 auf der Windschutzscheibe 10. Nicht dargestellt ist eine an sich bekannte signalverarbeitende Anordnung, die entweder im Hallsensor integriert (digitaler Hallsensor) , als separates Bauteil ausgeführt oder in eine an sich bekannte Wischersteuerung integriert ist.FIG. 1 shows a windshield wiper system for a motor vehicle with a windshield 10 partially shown, the windshield wiper system consisting of two wiper levers 12, 14, which transmit power by means of a normal wiper linkage 16 and a 4-link wiper linkage 18 with the spur gear 20 of a worm gear 21 with a drive motor 22 are connected. Wiper blades 13, 15 are assigned to wiper levers 12, 14. The position of the parking position sensor 24, which detects the parking position 26 of the wiper blades 13, 15, is indicated on the circumference of the spur gear 20. The delimitation of the wiper surface 28 of both wiper blades 13, 15 on the windshield 10 is sketched with a semicolon. A known one is not shown signal processing arrangement, which is either integrated in the Hall sensor (digital Hall sensor), designed as a separate component or integrated in a wiper control known per se.
Figur 2 zeigt den Aufbau der erfindungsgemäßen, als Parklagensensor 24 ausgebildeten, Sensoranordnung. Sie enthält einen unipolaren Hallsensor 30 und einen Steuermagneten 32. Der Steuermagnet 32 ist auf dem drehbaren Stirnrad 20 des Antriebsmotors 22 am äußeren Rand befestigt, so daß bei Drehung des Stirnrades 20 in Pfeilrichtung zuerst der Nordpol N und nachfolgend der Südpol S des Steuermagneten 32 an den räumlich am Getriebegehäuse fixierten Hallsensor 30 vorbeigeführt wird. Die eingezeichneten Magnetfeldlinien 34 treten am Nordpol N aus und treten am Südpol S ein. Ihre Richtung ist durch Pfeilspitzen gekennzeichnet.FIG. 2 shows the structure of the sensor arrangement according to the invention, designed as a parking position sensor 24. It contains a unipolar Hall sensor 30 and a control magnet 32. The control magnet 32 is fastened to the rotatable spur gear 20 of the drive motor 22 on the outer edge, so that when the spur gear 20 rotates in the direction of the arrow, the north pole N and subsequently the south pole S of the control magnet 32 first Hall sensor 30, which is spatially fixed to the transmission housing, is guided past. The drawn magnetic field lines 34 emerge at the north pole N and enter at the south pole S. Their direction is indicated by arrowheads.
Figur 3 zeigt ein durch die erfindungsgemäße Anordnung nach Figur 2 erzeugtes Meßspannungssignal UM aufgetragen über den Weg x des auf dem Stirnrad 20 angebrachten Steuermagneten 32. Der Kurvenverlauf spiegelt eine Situation wider, in der die Wischerblätter 13, 15 sich nach dem Wischen ihrer Parklage 26 nähern, die Parklage 26 überwischen und sich in Wischrichtung weiterbewegen. Zeitgleich bewegt sich derFIG. 3 shows a measurement voltage signal U M generated by the arrangement according to the invention as shown in FIG. 2 plotted over the path x of the control magnet 32 attached to the spur gear 20 approach, wipe over the parking position 26 and move on in the wiping direction. The moves at the same time
Steuermagnet 32 auf den Hallsensor 30 zu und an ihm vorbei. Das Meßspannungssignal UM des Hallsensors 30 schlägt dabei erst in negative Richtung aus und anschließend in positive Richtung. Die Amplitude des Ausschlags ist unter anderem abhängig von der Magnetfeldstärke 34, die im Hallsensor 30 wirkt. Die Position des Steuermagneten 32 zu dem Hallsensor 30 bei maximalem negativen Ausschlag entspricht ungefähr der in Figur 2 dargestellten Position. Bei größer werdenden Abstand von Steuermagneten 32 zu Hallsensor 30 geht der Ausschlag gegen null. Auf der positiven, ansteigenden Flanke sind für den Schaltvorgang zwei Grenzwerte UMmin, UM max vorgegeben. Diesen Grenzwerten sind Positionen xl, x2 des Steuermagneten 32 zugeordnet.Control magnet 32 to the Hall sensor 30 and past it. The measuring voltage signal U M of the Hall sensor 30 first deflects in the negative direction and then in the positive direction. The amplitude of the deflection depends, among other things, on the magnetic field strength 34 that acts in the Hall sensor 30. The position of the control magnet 32 with respect to the Hall sensor 30 at maximum negative deflection corresponds approximately to that position shown in Figure 2. As the distance between control magnet 32 and Hall sensor 30 increases, the deflection approaches zero. On the positive, rising edge, two limit values U Mmin , U M max are specified for the switching process. Positions xl, x2 of the control magnet 32 are assigned to these limit values.
Die Wirkungsweise der erfindungsgemäßen Sensoranordnung wird nun anhand Figur 3 beschrieben.The mode of operation of the sensor arrangement according to the invention will now be described with reference to FIG. 3.
Im Wischbetrieb wird die Windschutzscheibe 10 innerhalb der Wischfläche 28 gewischt und/oder gereinigt. Nach dem letzten Wischzyklus sollen die Wischerblätter 13, 15 in der Parklage 26 abgelegt werden. Die Parklage 26 der Wischerblätter 13, 15 wird durch den erfindungsgemäßen Parklagensensor 24 erfaßt, indem das Meßspannungssignal UM des Parklagensensorε 24 an eine an sich bekannte signalauswertende Anordnung weitergeleitet wird, die das Meßspannungssignal UM auswertet und den Antriebsmotor 22 in der Parklage 26 abschaltet oder stillsetzt.In the wiping operation, the windshield 10 is wiped and / or cleaned within the wiping surface 28. After the last wiping cycle, the wiper blades 13, 15 are to be deposited in the parking position 26. The parking position 26 of the wiper blades 13, 15 is detected by the parking position sensor 24 according to the invention, in that the measuring voltage signal U M of the parking position sensor 24 is forwarded to a signal-evaluating arrangement known per se, which evaluates the measuring voltage signal U M and switches off the drive motor 22 in the parking position 26 or stops.
Sobald sich die Wischerblätter 13, 15 ihrer Parklage 26 nähern, nähert sich ebenfalls der auf dem Stirnrad 20 des Motors 22 befestigte Steuermagnet 32 dem Hallsensor 30. Das Magnetfeld 34 des Steuermagneten 32 durchdringt dabei denAs soon as the wiper blades 13, 15 approach their parking position 26, the control magnet 32 fastened on the spur gear 20 of the motor 22 also approaches the Hall sensor 30. The magnetic field 34 of the control magnet 32 penetrates the
Hallsensor 30. Da der Steuermagnet 32 sich zuerst mit seinem Nordpol N dem Hallsensor 30 nähert, induziert die zu der Hallsensorfläche senkrechte Komponente des Magnetfelds 34a eine negative Meßspannung UM im Hallsensor 30, die zu der signalverarbeitenden Anordnung geführt wird. Gelangt der Südpol S des Steuermagneten 32 in den Wirkungsbereich des Hallsensors 30, so wird die Hallsensorfläche mit einem entgegengesetzt gerichteten Magnetfeld 34b durchflutet, das eine positive Meßspannung UM induziert. Der Richtungswechsel des Magnetfelds 34 bedingt im Übergangsbereich ein Vorzeichenwechsel der Meßspannung UM und bewirkt einen steilen und schnellen Spannungsanstieg vor und nach demHall sensor 30. Since the control magnet 32 first approaches the Hall sensor 30 with its north pole N, the component of the magnetic field 34a perpendicular to the Hall sensor surface induces a negative measuring voltage U M in the Hall sensor 30, which leads to the signal processing arrangement. If the south pole S of the control magnet 32 comes into the effective range of the Hall sensor 30, the Hall sensor surface is covered with a flooded oppositely directed magnetic field 34b, which induces a positive measuring voltage U M. The change in direction of the magnetic field 34 causes a change in the sign of the measuring voltage U M in the transition region and causes a steep and rapid voltage rise before and after
Nulldurchgang (UM = 0) . Diese steile Flanke wird genutzt, um die Parklage 26 festzulegen. Innerhalb des Intervalls von U M,min und u M,max detektiert die signalauswertende Anordnung den Spannungsanstieg und schaltet daraufhin den Motor 22 aus. Durch den steilen Spannungsanstieg sind die zugeordneten Positionen xl, x2 des Steuermagneten 32 eng begrenzt, so daß die Parklagetoleranzen klein sind.Zero crossing (U M = 0). This steep flank is used to fix the parking position 26. Within the interval of M U, m and n i M u, max signalauswertende the device detects the voltage rise, and then switches the motor 22 off. Due to the steep rise in voltage, the assigned positions xl, x2 of the control magnet 32 are narrowly limited, so that the parking position tolerances are small.
In alternativen Ausführungsbeispielen kann die Sensoranordnung zur Positionserkennung von Wischerblättern verwendet werden. So kann z. B. bei Anordnung der Sensoranordnung an hin- und hergehenden Teilen der Wischanlage die obere und untere Umkehrlage der Wischer beim Wischbetrieb erfaßt werden und über eine Steuerung der Antriebsmotor ausgeschaltet, stillgesetzt oder reversiert werden.In alternative exemplary embodiments, the sensor arrangement can be used for position detection of wiper blades. So z. B. with arrangement of the sensor arrangement on reciprocating parts of the wiper system, the upper and lower reversal of the wipers can be detected during wiping and switched off, stopped or reversed via a control of the drive motor.
Die erfindungsgemäße Sensoranordnung findet überall dort Verwendung, wo Positionen, Winkelstellungen, Abstände und daraus abgeleitete Größen, wie z. B. Drehzahl, zu bestimmen sind. Mit einer Steuerung sind ebenfalls genaue Zählvorrichtungen zu erhalten.The sensor arrangement according to the invention is used wherever positions, angular positions, distances and sizes derived therefrom, such as. B. speed to be determined. Accurate counting devices can also be obtained with a control.
Die erfindungsgemäße Sensoranordnung ist durch analoge oder digitale Hallsensor-Bauelemente realisierbar, die in SMD- Technik auf eine Leiterplatte angebracht werden können. Dabei können je nach Verwendungszweck unipolare oder bipolare Hallsensoren verwendet werden. The sensor arrangement according to the invention can be implemented by analog or digital Hall sensor components, which can be attached to a printed circuit board using SMD technology. Depending on the intended use, unipolar or bipolar Hall sensors can be used.

Claims

Ansprüche Expectations
1. Sensoranordnung (24) zur Positionserfassung von bewegbaren Teilen (20) , vorzugsweise zur Parklagenerkennung eines Scheibenwischers (12, 14), mit einem Hallsensor (30) und einem relativ dazu bewegbaren Steuermagneten (32) , letzterer angeordnet auf dem vorzugsweise drehbaren Teil (20) , wobei der am Hallsensor (30) wirksame Anteil des Magnetfeldes (34) des Steuermagneten (32) als Meßspannung (UM) über einen Signalausgang des Hallsensors (30) erfaßbar und auswertbar ist, dadurch gekennzeichnet, daß der Steuermagnet (32) derart angeordnet ist, daß bei Relativbewegung des bewegbaren Teils (20) in Bewegungsrichtung der Steuermagnet (32) zuerst mit seinem einen Pol, vorzugsweise dem Nordpol (N) , und nachfolgend mit seinem Gegenpol, vorzugsweise dem Südpol (S) , dem Hallsensor (30) angenähert wird.1. Sensor arrangement (24) for detecting the position of movable parts (20), preferably for detecting the parking position of a windshield wiper (12, 14), with a Hall sensor (30) and a control magnet (32) movable relative thereto, the latter arranged on the preferably rotatable part ( 20), the portion of the magnetic field (34) of the control magnet (32) effective at the Hall sensor (30) being detectable and evaluable as a measuring voltage (U M ) via a signal output of the Hall sensor (30), characterized in that the control magnet (32) is arranged in such a way that when the movable part (20) moves relative to the direction of movement, the control magnet (32) first with its one pole, preferably the north pole (N), and then with its opposite pole, preferably the south pole (S), the Hall sensor (30 ) is approximated.
2. Sensoranordnung (24) nach Anspruch 1, dadurch gekennzeichnet, daß die Relativbewegung des Steuermagneten (32) zum Hallsensor (30) zuerst eine negative Meßspannung (UM) und dann eine positive Meßspannung (UM) induziert.2. Sensor arrangement (24) according to claim 1, characterized in that the relative movement of the control magnet (32) to the Hall sensor (30) first induces a negative measuring voltage (U M ) and then a positive measuring voltage (U M ).
3. Sensoranordnung (24) nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sie einen unipolaren, digitalen SMD-3. Sensor arrangement (24) according to claim 1 or 2, characterized in that it is a unipolar, digital SMD
Hallsensor (30) enthält.Hall sensor (30) contains.
4. Sensoranordnung (24) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß bei dem Vorbeibewegen des Steuermagneten (32) am Hallsensor (30) durch die Richtungsumkehr des am Hallsensor (30) wirksamen Magnetfeldanteils (34) der Übergang von negativer zu positiver Meßspannung (UM) so steil verläuft, daß in einem engen Positionsbereich des Steuermagneten (32) die Position (xl, x2) des zu bewegenden Teils (20) erfaßbar ist. 4. Sensor arrangement (24) according to one of the preceding claims, characterized in that when the control magnet (32) moves past the Hall sensor (30) by reversing the direction of the Hall sensor (30) effective magnetic field component (34) the transition from negative to positive measuring voltage (U M ) is so steep that the position (xl, x2) of the part (20) to be moved can be detected in a narrow position range of the control magnet (32).
PCT/DE1997/001770 1996-09-27 1997-08-19 Sensor system for locating mobile elements WO1998013668A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996139801 DE19639801A1 (en) 1996-09-27 1996-09-27 Sensor arrangement for position detection of moving parts
DE19639801.0 1996-09-27

Publications (1)

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WO1998013668A1 true WO1998013668A1 (en) 1998-04-02

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DE10348887A1 (en) * 2002-10-23 2004-05-13 Carl Zeiss Scanner head for measuring coordinates of surface of solid object has movable pin with ball end connected to magnet and Hall element
DE102008024346A1 (en) * 2008-05-20 2009-11-26 Valeo Systèmes d'Essuyage Windscreen washer system for vehicles and wiper motor for use in a windshield wiper and washer system
DE102020206966A1 (en) 2020-06-04 2021-12-09 Robert Bosch Gesellschaft mit beschränkter Haftung Wiper device and gear unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975687A (en) * 1989-08-29 1990-12-04 Frank W. Murphy Mfr. Hall effect signalling gauge
WO1991009320A1 (en) * 1989-12-15 1991-06-27 Robert Bosch Gmbh Process and device for testing a hall sensor system
JPH03173341A (en) * 1989-12-01 1991-07-26 Fuji Electric Co Ltd Magnetoelectric converting element fixing device for dynamo-electric machine
EP0484250A1 (en) * 1990-10-31 1992-05-06 Sony Corporation Apparatus for detecting the position of a movable lens in a lens barrel of a camera
EP0726448A1 (en) * 1995-02-09 1996-08-14 Festo KG Magnetic position sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975687A (en) * 1989-08-29 1990-12-04 Frank W. Murphy Mfr. Hall effect signalling gauge
JPH03173341A (en) * 1989-12-01 1991-07-26 Fuji Electric Co Ltd Magnetoelectric converting element fixing device for dynamo-electric machine
WO1991009320A1 (en) * 1989-12-15 1991-06-27 Robert Bosch Gmbh Process and device for testing a hall sensor system
EP0484250A1 (en) * 1990-10-31 1992-05-06 Sony Corporation Apparatus for detecting the position of a movable lens in a lens barrel of a camera
EP0726448A1 (en) * 1995-02-09 1996-08-14 Festo KG Magnetic position sensor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J. SPENCER ET AL.: "Hall-effect works in two-state switches", ELECTRONIC DESIGN, vol. 28, no. 14, July 1980 (1980-07-01), ROCHELLE PARK, pages 125 - 127, XP002049982 *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 417 (E - 1125) 23 October 1991 (1991-10-23) *

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