EP0917643A1 - Detecteur de course - Google Patents

Detecteur de course

Info

Publication number
EP0917643A1
EP0917643A1 EP98905220A EP98905220A EP0917643A1 EP 0917643 A1 EP0917643 A1 EP 0917643A1 EP 98905220 A EP98905220 A EP 98905220A EP 98905220 A EP98905220 A EP 98905220A EP 0917643 A1 EP0917643 A1 EP 0917643A1
Authority
EP
European Patent Office
Prior art keywords
displacement sensor
band
sensor according
detection device
longitudinal direction
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Withdrawn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
EP98905220A
Other languages
German (de)
English (en)
Inventor
Matthias Moerbe
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 EP0917643A1 publication Critical patent/EP0917643A1/fr
Withdrawn legal-status Critical Current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
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors

Definitions

  • the invention relates to a displacement sensor according to the preamble of the main claim.
  • a displacement sensor of the type described in the introduction is advantageous in the development with the features according to the invention of the characterizing part of the main claim in that an electrical output signal is generated by means of a magnetized tape with detection of polarity changes when the tape moves.
  • a contactless path measurement that has an extremely small size can thus be implemented in a simple manner.
  • the detection of longer distances traveled by a mechanical component can also be achieved in an advantageous manner by using a magnetizable tape which is easily adaptable in length to the application conditions and which can be moved past a detection device in its longitudinal direction .
  • the tape can be magnetized using known methods in predetermined sections to form individual magnets with alternating polarity.
  • the band is provided on both sides in the sections with individual magnets, each of which can be moved past a detection device.
  • a higher resolution can be achieved in that the individual magnets located opposite each other on the tape sides are offset by half their length in the longitudinal direction of the tape. In this way, a path sensor is built up with which incremental resolution of the path of the strip with half the section width is possible.
  • the band advantageously consists of a magnetizable and vulcanizable, permanently elastic material and is produced from two sub-bands.
  • a supporting fabric is vulcanized between the partial belts in such a way that the belt is flexible in the longitudinal direction and stiffened in the vertical direction. This is a safe guide and easy winding of the tape at one guarantee precise path detection even under mechanical loads.
  • a simple and compact construction of the displacement sensor is possible in that the one or two detection devices are installed in a measuring cell, with this being able to be guided past these detection devices directly in tape. In order to wind the tape securely, there are helical guideways in the measuring cell into which the tape can be moved.
  • the displacement sensor can be provided in a simple manner directly with a printed circuit board which carries an electrical circuit for evaluating, further processing and, if appropriate, digitizing the output signal of the detection devices.
  • AMR anisotropic magnetoresistive
  • GMR giant magnetoresistive
  • VDI Report No. 509 (VDI Verlag 1984), pages 263 to 268, for example, describes in the essay "New, alternative solutions for speed sensors in motor vehicles on a magnetoresistive basis” how a special one with magnetic probes as measuring elements simple and insensitive detection of the angle of rotation can be carried out on rotating shafts or on gears. This is possible because the field line direction of a permanent magnet located in the sensor can be changed and detected by a movement of the permanent magnet.
  • Other advantageous developments of the invention are specified in the subclaims.
  • Figure 1 is a schematic view of a braking device in a motor vehicle with a displacement sensor in a measuring cell;
  • FIG. 2 shows a detailed image of a displacement sensor with a magnetizable band in the braking device according to FIG. 1;
  • Figure 3 is a view of a measuring cell with the Eand of Figure 2;
  • FIG. 4 shows a detailed picture of a guideway for the magnetizable band
  • Figure 5 is a view of a belt with a support fabric
  • Figure 6 is a schematic diagram of the magnetized sections of the tape
  • FIG. 7 shows a displacement sensor with a printed circuit board
  • Figure 8 is a diagram of the voltage curve at the output of the detection device.
  • a braking device 1 for a motor vehicle, in which a brake pedal 2 is mounted as a mechanical component at one end 3 and can be deflected at its other end according to arrow 4.
  • An actuation of the brake pedal 2 leads to a movement of a push rod 5, which acts on a downstream brake cylinder 6.
  • a measuring cell 7 is arranged on the housing of the brake cylinder 6, into which a band 8 can be inserted for distance measurement proportional to the movement of the push rod 5.
  • An electrical signal proportional to the path of the push rod 5 is thus available at the output connections 9 of the measuring cell 7 for evaluation and / or for further processing.
  • a displacement sensor 10 according to FIG. 2 is accommodated in the measuring cell 7 according to FIG. 1.
  • the band 8 has magnetized fields with alternating polarity, which are guided past detection devices 13 and 14 in a recess 12 in the displacement sensor 10.
  • detection devices 13 and 14 can preferably be so-called AMR (anisotropic magnetoresistive) measuring elements, GMR (giant magnetoresistive) measuring elements or Hall measuring elements, which are already mentioned in the introduction to the description.
  • the output signals of the detection devices can be brought out via connections 15.
  • the band 8 consists of a magnetizable and vulcanizable permanently elastic material and is made of two sub-bands 8 'and 8'', a support fabric 17 being inserted between the sub-bands 8' and 8 '' during the production of the band 8.
  • the support fabric 17 is vulcanized into the band 8 in such a way that, due to the position of the support fabric 17, the band 8 is stiffened in the longitudinal direction, that is to say in the direction of movement, flexibly and perpendicularly thereto.
  • the sections 11 can be seen, each with partial magnets magnetized in the longitudinal direction, which are here offset in the subbands 8 'and 8' 'from each other by half a section length.
  • a printed circuit board 18 with an electrical evaluation circuit is attached directly above the detection devices on the displacement sensor 10, the connections 15 being contacted directly with conductor tracks which are not recognizable here. Fastening of the printed circuit board 18 is possible by means of pins 19 molded onto the displacement sensor, which can be caulked after assembly, for example by thermocompression.
  • the curves 20 and 21 of the output voltages U of the detection devices 13 and 14 can be seen from a diagram according to FIG. This results in switching operations S when the strip 8 is guided past, as shown in FIG. 6.
  • a switching pulse S is produced, the switching pulses of the detection devices 13 and 14 being offset in relation to one another by half a section width, so that there is a measurement resolution of the size of half a section width.
  • the output signal of the detection devices 13 and 14 can be evaluated by counting the switching pulses S, from which the absolute value of the path of the band 8 results. However, it is also possible to carry out an analog evaluation of the switching processes S which fill up against one another, so that approximately a linear change in the output signal can be achieved when the belt 8 moves along a profile 23.
  • a possible realization of the evaluation of the switching processes S described with reference to FIG. 8 can be carried out with a circuit according to FIG.
  • the circuit is constructed with conventional electronic components and is only to be explained here in principle when applied to the displacement sensor 10.
  • an analog voltage curve 24 and a digital signal 26 result at the detection device 13;
  • An analog voltage curve 25 and a digital signal 27 result at the detection device 14.
  • These signals can be processed in an electronic module 28 in such a way that an output signal U is present at the output 29, which is linear with the voltage curve 23 according to FIG the measured path size changes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne un détecteur de course dans lequel une valeur absolue de la course d'une pièce mécanique, par exemple une pédale de frein, ou bien une variation de course peut être détectée et un signal de sortie électrique correspondant peut être produit. La pièce mécanique (2) est reliée avec une bande magnétisable (8; 8', 8'') qui passe en sens longitudinal devant au moins une unité de détection (13, 14). Cette bande (8; 8', 8'') est magnétisée, dans des sections prédéfinies (11) avec une polarité respectivement alternée, les changements de polarité lors d'un mouvement de la bande (8; 8', 8'') étant détectés pour la production du signal de sortie électrique.
EP98905220A 1997-06-10 1998-01-08 Detecteur de course Withdrawn EP0917643A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19724388A DE19724388A1 (de) 1997-06-10 1997-06-10 Wegsensor
DE19724388 1997-06-10
PCT/DE1998/000040 WO1998057127A1 (fr) 1997-06-10 1998-01-08 Detecteur de course

Publications (1)

Publication Number Publication Date
EP0917643A1 true EP0917643A1 (fr) 1999-05-26

Family

ID=7832010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98905220A Withdrawn EP0917643A1 (fr) 1997-06-10 1998-01-08 Detecteur de course

Country Status (5)

Country Link
US (1) US6466010B1 (fr)
EP (1) EP0917643A1 (fr)
JP (1) JP2000517059A (fr)
DE (1) DE19724388A1 (fr)
WO (1) WO1998057127A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10010042A1 (de) * 2000-01-13 2001-07-19 Continental Teves Ag & Co Ohg Linearer Wegsensor und dessen Verwendung als Betätigungsvorrichtung für Kraftfahrzeuge
WO2001051893A1 (fr) 2000-01-13 2001-07-19 Continental Teves Ag & Co. Ohg Capteur de deplacement lineaire et utilisation en tant que dispositif d'actionnement de vehicules motorises
EP1307367B1 (fr) 2000-07-28 2013-09-11 Continental Teves AG & Co. oHG Systeme, capteur de position et dispositif de reception permettant la transmission securisee de la position d'un element d'actionnement, ainsi que son utilisation
WO2002010689A1 (fr) * 2000-08-02 2002-02-07 Continental Teves Ag & Co. Ohg Detecteur de champ magnetique actif, son utilisation, procede et dispositif associes
US6940277B2 (en) * 2000-11-17 2005-09-06 University Of South Florida Giant magnetoresistance based nanopositioner encoder
DE10137602B4 (de) * 2001-08-01 2004-08-26 Hella Kg Hueck & Co. Elektrisches Bremssystem
WO2003033320A1 (fr) * 2001-10-12 2003-04-24 Continental Teves Ag & Co. Ohg Pedale d'actionnement pour des vehicules automobiles
DE102007036463A1 (de) * 2006-08-01 2008-02-28 Continental Teves Ag & Co. Ohg Sensoranordnung zur präzisen Erfassung von Relativbewegungen zwischen einem Encoder und einem Sensor
CN109269437B (zh) * 2018-07-18 2020-08-07 武汉船用机械有限责任公司 一种带式制动器制动带的检测方法
US10948315B2 (en) * 2018-12-21 2021-03-16 Industrial Technology Research Institute Magnetic position detecting device and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273001A (en) * 1965-06-01 1966-09-13 Baermann Max Permanent magnet device for generating electrical energy
DE3137951C2 (de) * 1981-09-24 1985-10-17 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Hydraulisches Schubkolbengetriebe, insbesondere zur Verwendung als Rück- und Schreitzylinder in untertägigen Gewinnungsbetrieben, mit an der Kolbenstange angeordneten Permanentmagneten
DE3813173A1 (de) * 1988-04-20 1989-11-02 Teves Gmbh Alfred Verfahren zum betrieb eines hauptzylinders
DE9412435U1 (de) * 1994-08-02 1994-09-29 Festo Kg Arbeitszylinder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9857127A1 *

Also Published As

Publication number Publication date
WO1998057127A1 (fr) 1998-12-17
US6466010B1 (en) 2002-10-15
JP2000517059A (ja) 2000-12-19
DE19724388A1 (de) 1998-12-17

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