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WO2009021792A1 - Capteur de trajet - Google Patents

Capteur de trajet Download PDF

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Publication number
WO2009021792A1
WO2009021792A1 PCT/EP2008/059090 EP2008059090W WO2009021792A1 WO 2009021792 A1 WO2009021792 A1 WO 2009021792A1 EP 2008059090 W EP2008059090 W EP 2008059090W WO 2009021792 A1 WO2009021792 A1 WO 2009021792A1
Authority
WO
WIPO (PCT)
Prior art keywords
flux
piece
transducer element
magnet
sensor 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
PCT/EP2008/059090
Other languages
German (de)
English (en)
Inventor
Arno Wehle
Wolfgang Welsch
Michael Kleinknecht
Klaus Walter
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
Priority to CN200880103098A priority Critical patent/CN101779305A/zh
Priority to EP08786087A priority patent/EP2188854A1/fr
Publication of WO2009021792A1 publication Critical patent/WO2009021792A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G01D5/147—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 movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other

Definitions

  • the invention is based on a displacement sensor according to the preamble of the independent claim.
  • a displacement sensor with a magnetoelectric transducer element is already known. It consists of a magnetoelectric transducer element and a magnetic circuit of at least one flux guide and a magnet, in which at a small size by the movement of an element a measurable with the transducer element influencing the magnetic flux is effected.
  • the flux guides and the transducer element are located during the distance measurement to each other in an unchanged position, these parts and the at least one magnet are movable relative to each other.
  • a change of the evaluable by the transducer element magnetic field is caused by a change of the air gap in the magnetic circuit during the movement of the magnet.
  • the flux conducting pieces of the magnetic circuit have such a contour enclosing the path of the magnet that, due to the change in the width of the air gap in the trajectory, a specifiable signal curve results in the transducer element.
  • the displacement sensor according to the invention according to the features of the independent claim has the advantage that thanks to the rotatable arrangement of the flux along the detection direction and the way rotatably mounted parts can be detected. Furthermore, by appropriate design of the flux piece, a linear characteristic curve of the displacement sensor can be achieved.
  • the flux piece is formed rotationally symmetrically along the axis of rotation. This ensures that, irrespective of a possible rotation of the flux piece, the respective position of the flux piece can be reliably detected.
  • the air gap is influenced only path-dependent, but not rotation-dependent in the same way.
  • FIG. 1 shows a side view of the displacement sensor
  • FIG. 2 shows a plan view of the displacement sensor
  • FIG. 3 shows a plan view of an alternative exemplary embodiment with two transducer elements and two magnets
  • FIG. 4 shows a plan view of another alternative exemplary embodiment with about 90 °
  • Figure 5 shows a plan view of a displacement sensor with an L-shaped flux guide
  • Figure 6 is a plan view of another embodiment with a U-shaped flux guide
  • Figure 7 is a plan view of a further embodiment in which the flux is guided by means of two flux guide elements
  • the figure 8 is a plan view of another embodiment, at the magnet and transducer element are arranged separately from each other
  • Figure 9 shows the top view of an arrangement with redundant
  • Figure 11 shows the corresponding plan view of the embodiment of Figure 10
  • Figure 12 is a perspective view of a substantially conically shaped river piece
  • Figure 13 is another 12 is a signal-path diagram
  • FIG. 15 is a side view of an alternative, symmetrically designed flux-conducting element with two transducer elements
  • FIG. 16 shows the associated position-dependent signal characteristics of FIG
  • Transducer elements according to the arrangement of Figure 15 and Figure 17 shows a schematic arrangement of the displacement sensor in conjunction with a pedal.
  • a flux piece 13 of substantially parabolic design in cross-section is displaceably arranged along a detection direction 14 with respect to a magnet 10 and a transducer element 20 in front of it.
  • the flux piece 13 can also rotate about an axis of rotation 16 in addition to a movement in the detection direction 14.
  • the rotation axis 16 is formed substantially parallel to the detection direction 14.
  • an air gap Ll is formed between converter 20 and outer contour of the flow piece 13.
  • the air gap Ll changes when the flux piece 13 moves relative to the transducer 20 in the detection direction 14.
  • the air gap Ll does not change when the flow piece 13 rotates about the rotation axis 16 without displacement in the detection direction 14.
  • FIG. 3 differs from the exemplary embodiment according to FIG. 2 by a redundant design of magnet 10 and transducer element 20.
  • magnet 10 and transducer element 20 are arranged on the opposite side of the flux piece 13 .
  • the two magnets 10, 11 generate field lines of identical orientation, that is, the
  • Magnetic poles N, S of the two magnets 10, 11 are oriented in the same way.
  • the minimum distance between the second transducer 21 and outer contour of the flow piece defines a second air gap L2.
  • the magnetic circuit or the magnetic flux is deliberately guided by a flux guide element 18.
  • the flux guide element 18 has an essentially L-shaped design and picks up the magnetic flux directly on the magnet 10, guiding it via the flux piece 13 next lying point the river piece 13 to.
  • the flux piece 13 closes the magnetic circuit to the transducer element 20.
  • the exemplary embodiment according to FIG. 6 differs from that according to FIG. 5 in particular in that the flux-conducting element 18 is now substantially U-shaped. At one end of the flux guide 18 there is the magnet 10, at the opposite end the transducer element 20.
  • Magnetic circuit extends via the flux guide 18, the transducer element 20, the second air gap L2, the flux piece 13, the first air gap Ll and the magnet 10 back into the flux guide 18.
  • the air gap changes Ll between the magnet 10 and the flow piece 13 on the one hand and the air gap L2 between the transducer element 20 and the flow piece 13 in the same manner.
  • magnet 10 and transducer element 20 are arranged relatively close to the flux piece 13, so that the magnetic circuit is also closed via these elements.
  • the flux guiding element 18 consists of two parts.
  • the upper part is arranged in the immediate vicinity of the magnet 10 and supplies the magnetic flux to the flux piece 13 via an air gap at the end of the flux guide element 18.
  • the magnetic circuit closes through the lower part of the flux-conducting element 18, which leads the magnetic flux via a further air gap L2 at the lower end of the flux piece 13 via the transducer element 20.
  • the air gaps L1, L2 between the respective ends of the flux-conducting element 18 and the flux piece 13 change in the same way during a change in position of the flux piece 13 along the detection direction 14.
  • the exemplary embodiment according to FIG. 8 differs from that of FIG. 7 in that now the transducer element 20 is arranged directly between the flux piece 13 and the lower end of the flux guide element 18.
  • the flux guide 18 is again formed in two parts and now encloses the respective poles of the magnet 10 from above or below.
  • the magnetic flux-in addition to the transducer element 20- is detected redundantly by another transducer element 21.
  • the further transducer element 21 is arranged between the transducer element 20 and the flux piece 13.
  • the magnet 10 is located behind the transducer element 20.
  • a tube 24, which is shown in cross-section, is provided, which is fixedly connected to the flux piece 13.
  • Tube 24 in turn could be mounted in a fixed cylinder, not shown, so that tube 24 and flow piece 13 can move linearly in the detection direction 14 or rotating about the rotation axis 16 parallel to the detection direction 14.
  • the corresponding plan view is shown in FIG. 11 with the associated arrangement of the magnet 10 behind the transducer element 20.
  • FIG. 12 shows an alternative embodiment of the flux piece 13. It has a substantially conical shape and runs in a cylindrical end region. Schematically indicated is the pipe section enclosing the flow piece. According to FIG. 13, in addition to the converter element 20 and the magnet 10, a substantially U-shaped flux guide 18 is shown. This arrangement is particularly advantageous because the total air gap L1 + L2 is independent of the position of the flux piece 13, as long as it shifts along an imaginary axis between the two transducers 20, 21 transversely to the detection direction 14.
  • the output signal O of the transducer element 20 as a function of the path x in the detection direction 14 is shown in FIG.
  • a linear relationship between path x and output signal O of the transducer element 20 can be detected on the basis of the suitable outer contour design of the flux piece 13.
  • the flux piece 13 consists of two paraboloids 13, 13 ', which are placed against one another on the end side, whose diameter increases first along the detection direction 14 and then decreases.
  • the detection direction 14 are now two transducer elements 20, 21 in front of the magnet
  • FIG. 17 shows the schematic structure of the displacement sensor for position detection of a pedal 28.
  • the pedal 28 is mounted pivotably about a bearing 26 substantially and moves via a coupling 30, the flow piece 13 with surrounding tube 24 with respect to the magnet 10 with superior
  • the embodiments shown in the figures operate as follows.
  • a change in the direction of the flow piece 13 along the detection direction 14 results in the selected parabolic outer contour of the flow piece 13 in an altered air gap Ll between transducer element 20 and flow piece 13.
  • the magnetic flux, the transducer element 20, for example changes a Hall element, detected.
  • Part of the corresponding magnetic circuit is also a magnet 10, for example a permanent magnet whose magnetic poles are oriented so that the field lines be returned by the transducer element 20, air gap Ll, flow piece 13 and again via the magnet 10.
  • the flux piece 13 is constructed as a rotationally symmetrical body.
  • rotation of the flux piece 13 about the rotation axis 16 does not result in a change in the air gap L 1 between the outer contour of the flux piece 13 and the transducer element 20.
  • the corresponding rotation arrow indicates the mounting of the flux piece 13 about the rotation axis 16.
  • the rotation axis 16 is oriented substantially parallel to the detection direction 14. If the flux piece 13 shifts along the detection direction 14, then the transducer element 20 changes the output signal according to the characteristic curve according to FIG. 13 - independently of a possible one
  • the outer contour of the flux piece 13 is selected so that a linear relationship between the output signal O of the transducer element 20 and the path x is established.
  • the parabolic outer contour of the flow piece 13 has been found to be particularly favorable.
  • the flux piece 13 is made of a ferromagnetic material, such as steel, as part of the magnetic circuit.
  • Transducer element 21 suitably arranged, wherein it preferably has the same air gap L2 to the flux piece 13 as the first transducer element 20.
  • a first magnetic circuit is formed via the first magnet 10, first transducer element 20, first air gap Ll, and the corresponding portion of the flux piece 13,
  • a second magnetic circuit is formed via the second magnet 11, the second transducer element 21, the second air gap L2, wherein the second magnetic circuit is closed via the flux guide 13.
  • the two transducer elements 20, 21 now independently and parallel to each other detect the position of the flux piece 13th in the manner described in connection with the first embodiment.
  • Magnetic circuits change during a movement of the flux piece 13 in the detection direction 14 in the same way. If one transducer element 20 fails, the further transducer element 21 detects the position of the flux piece 13, so that a fault-tolerant operation can be ensured.
  • the output signals of the two transducers 20, 21 are preferably added together and then averaged. The resulting output signal serves to determine the path x. If the second transducer element 21 is located opposite the first transducer element 20, an independence of the sum signal of the two transducers 20,
  • a flux guide element 18 is now additionally provided, which serves for the targeted guidance and introduction or removal of the magnetic field into or out of the flux piece 13.
  • the field lines are selectively guided over the transducer element 20, magnet 10, the L-shaped Flußleit- element 18 to the end, where it overcomes the minimum distance over the air gap L2 towards the flux piece 13, so that closed the magnetic circuit becomes.
  • the geometric structure of the arrangement can be selectively influenced and adapted to different installation spaces and conditions. The flexibility of the arrangement is very large. In addition, there is a large magnetically stable stroke and thus a larger measurement signal.
  • FIG. 6 the flux conducting element 18 now ends at the side opposite the transducer element 20, via which the field lines of the magnetic field are guided into the flux piece 13.
  • two flux guide elements 18 are now provided which specifically guide the field lines between flux guide element and magnet 10 or transducer element 20.
  • the degrees of freedom of the geometric arrangement of magnet 10 and transducer element 20 can be correspondingly increased by the flux guide elements 18. This is also evident from FIG. 8, where the permanent magnet 10 is arranged spatially separated from the transducer element 20 and is only magnetically connected to it by the flux guide element 18.
  • the arrangements of Figures 3, 6, 7, 8, 13 are fault tolerant, because the total air gap Ll + L2, formed from the sum of the first and second air gap Ll + L2, remains constant with small displacements of the flow piece 13 across the detection direction 14 along an imaginary axis between the two air gaps Ll, L2. If, for example, the flux 13 moves slightly vertically upwards in the plane of the drawing, the air Ll decreases by this shift less, while the second air gap L2 increases by this shift. However, the total air gap Ll + L2 does not change.
  • FIG. 9 shows a further redundant possibility of signal detection, in that now two converter elements 20, 21 are arranged one behind the other. They detect in parallel the magnetic field influenced by the change in position of the flux guide 13.
  • the tube 24 surrounding the flow piece 13 is additionally shown.
  • the tube 24, which is generally firmly connected to the flow piece 13, does not influence the magnetic circuit, since it consists of a non-ferromagnetic material, for example of aluminum.
  • the tube 24 is particularly suitable for a simplified storage of the displacement sensor in a cylindrical counterpart. To increase the degree of freedom of the arrangement is required that a position detection of the flux piece 13 must be ensured even when it rotates about the axis of rotation 16. This is achieved by the rotationally symmetrical structure of the flux piece 13.
  • the flux piece 13 is now substantially cone-shaped with a cylindrical end termination. It is essential in the design of the flux piece 13 that the outer diameter always changes with a displacement along the detection direction 14, so that the associated air gap L 1, which influences the magnetic field to be detected, is also constantly changing. A cone shape is particularly easy to produce.
  • the cylindrical end region serves, in particular, to make full use of the measuring range of the flowpiece contour, in particular, a drop in the signal is prevented. This is largely avoided by the shown cylindrical end section. In this area, however, no position detection is possible on the other side.
  • the selected in Figure 15 shape of the flux piece 13 is favored.
  • On the one hand there is an unambiguous route detection possible over the entire route.
  • Each of these transducer elements 20, 21 detects the path-dependent output signal, which can then be processed in a higher-level control unit by means of appropriate signal processing algorithms to form a path signal with a double signal swing.
  • the corresponding signal profiles of the two transducer elements 20, 21 are shown in FIG. 16.
  • the described displacement sensor is particularly suitable for position detection in pedals.
  • the pedal 28 is mechanically coupled via a coupling 30 mounted in the bearing 26 to the tube 24 and the flow piece 13 located therein.
  • a change in the pedal 28 leads to a displacement of the flux piece 13 in the detection direction 14.
  • the air gap between the transducer element 20 and flux piece 13 changes.
  • the corresponding output signal of the transducer element 20 indicates the corresponding position of the flux piece relative to the transducer element 20 and thus corresponds to the position of the pedal

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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

L'invention concerne un capteur de trajet avec au moins un élément convertisseur magnétoélectrique et un circuit magnétique constitué d'au moins un élément de guidage de flux (13) et au moins un aimant (10), dans lequel une influence du flux magnétique mesurable avec l'élément convertisseur (20, 21) est produite par un changement de position dans la direction de détection (16) de l'élément de guidage de flux (13) par rapport à l'élément convertisseur (20, 21). L'élément de guidage de flux (13) peut tourner autour d'un axe de rotation (16) qui correspond sensiblement à la direction de détection (16).
PCT/EP2008/059090 2007-08-14 2008-07-11 Capteur de trajet Ceased WO2009021792A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200880103098A CN101779305A (zh) 2007-08-14 2008-07-11 位移传感器
EP08786087A EP2188854A1 (fr) 2007-08-14 2008-07-11 Capteur de trajet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007038395A DE102007038395A1 (de) 2007-08-14 2007-08-14 Wegsensor
DE102007038395.0 2007-08-14

Publications (1)

Publication Number Publication Date
WO2009021792A1 true WO2009021792A1 (fr) 2009-02-19

Family

ID=39877737

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/059090 Ceased WO2009021792A1 (fr) 2007-08-14 2008-07-11 Capteur de trajet

Country Status (4)

Country Link
EP (1) EP2188854A1 (fr)
CN (1) CN101779305A (fr)
DE (1) DE102007038395A1 (fr)
WO (1) WO2009021792A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102607389B (zh) * 2012-02-21 2014-10-15 上海交通大学 磁力控位移装置
FR3018113B1 (fr) * 2014-02-28 2017-09-01 Electricfil Automotive Capteur magnetique pour determiner la position relative entre une cible aimantee et un systeme de mesure
DE102014205566A1 (de) * 2014-03-26 2015-10-01 Robert Bosch Gmbh Sensoranordnung zur Wegerfassung an einem bewegten Bauteil
CN104776791B (zh) * 2015-04-16 2018-09-07 日立楼宇技术（广州）有限公司 一种位移传感器和测量位移的方法
FR3128014B1 (fr) * 2021-10-07 2023-11-03 Safran Landing Systems Dispositif de mesure d’une position linéaire.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273481A2 (fr) * 1986-11-25 1988-07-06 North American Philips Corporation Capteur de dent d'engrenage non orienté utilisant un élément Hall
EP0584426A1 (fr) * 1992-07-28 1994-03-02 Hcb, Honeywell Centra Bürkle Ag Capteur analogue de position
DE10248148A1 (de) * 2002-10-16 2004-04-29 Suspa Holding Gmbh Wegmessvorrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19908036A1 (de) * 1999-02-24 2000-08-31 Zahnradfabrik Friedrichshafen Verfahren und Vorrichtung zur Erfassung der rotatorischen und der translatorischen Bewegung einer Welle
DE10039216C2 (de) * 2000-08-11 2003-01-16 Bosch Gmbh Robert Messvorrichtung zur berührungslosen Erfassung eines Drehwinkels oder eines Weges
DE10145313A1 (de) * 2000-09-14 2002-07-25 Helag Electronic Gmbh Sensorvorrichtung
EP1470393B1 (fr) 2002-01-23 2013-06-19 Robert Bosch Gmbh Capteur de trajectoire pourvu d'un element transducteur magnetoelectrique
DE102005045774A1 (de) * 2005-09-23 2007-04-05 Sfg Gmbh Messvorrichtung und Verfahren zur berührungslosen Bestimmung der Lage zweier relativ zueinander verstellbarer Bauteile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273481A2 (fr) * 1986-11-25 1988-07-06 North American Philips Corporation Capteur de dent d'engrenage non orienté utilisant un élément Hall
EP0584426A1 (fr) * 1992-07-28 1994-03-02 Hcb, Honeywell Centra Bürkle Ag Capteur analogue de position
DE10248148A1 (de) * 2002-10-16 2004-04-29 Suspa Holding Gmbh Wegmessvorrichtung

Also Published As

Publication number Publication date
DE102007038395A1 (de) 2009-02-19
CN101779305A (zh) 2010-07-14
EP2188854A1 (fr) 2010-05-26

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