WO2005080920A2 - Dispositif pour determiner la position angulaire d’un organe rotatif - Google Patents
Dispositif pour determiner la position angulaire d’un organe rotatif Download PDFInfo
- Publication number
- WO2005080920A2 WO2005080920A2 PCT/EP2005/000471 EP2005000471W WO2005080920A2 WO 2005080920 A2 WO2005080920 A2 WO 2005080920A2 EP 2005000471 W EP2005000471 W EP 2005000471W WO 2005080920 A2 WO2005080920 A2 WO 2005080920A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic flux
- generator
- magneto
- angular position
- poles
- Prior art date
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
-
- 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
- G01D5/16—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 resistance
-
- 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
- G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
- G01D2205/80—Manufacturing details of magnetic targets for magnetic encoders
Definitions
- the invention relates to a device for determining the angular position along a direction of rotation of a rotary member relative to a support.
- a device for determining the angular position along a direction of rotation of a rotary member relative to a support.
- Such a device can in particular be used in a vehicle to know the position of a pedal, such as the clutch pedal, or of a flap such as the throttle valve.
- Devices are already known comprising a magnetic flux generator and a magneto-resistive sensor generating an electrical signal as a function of the direction of the magnetic flux to which it is subjected.
- Such a sensor makes it possible to measure contactlessly, precisely, robustly and reliably the angular variations of the magnetic flux.
- the magneto-resistive sensor has been linked to the support and the magnetic flux generator to the rotary member.
- the problem then arises of generating a magnetic flux whose direction varies continuously, near the magneto-resistive sensor, as a function of the angular position of the rotary member with respect to the support, and this over a range of angular positions from at least 90 °.
- Such a problem is easily overcome when the magnetic flux generator is arranged at one end of the rotary member in the direction of rotation.
- the rotation of the magnetic flux generator then induces a relative displacement between said magnetic flux generator and the sensor.
- the magnetic flux generator is always close to the sensor despite the rotation of the rotary member, provision could be made to produce the magnetic flux generator in the form of a ring. But then it is not obvious to ensure that said ring-shaped generator generates a magnetic flux such that the angle between the magnetic flux and the sensor varies continuously as a function of the angular position of the rotary member. Conversely, it is easily known to produce magnets in the form of a straight bar (advantageously flat) generating a magnetic flux, the flux lines of which are parallel to one another. However, unless a large rod is made, the magnet is quickly moved away from the sensor, so that it is only possible to cover a narrow range of angular positions.
- the magnetic flux generator comprises alternating poles constituting a succession of magnets generating magnetic fluxes of substantially parallel directions.
- the magnetic flux generator appears "from a microscopic point of view” as a succession of poles arranged substantially opposite one of the other, although the magnetic flux generator is not rectilinear "from a macroscopic point of view”.
- FIG. 1 is a schematic representation of a device according to the invention in a first position
- - Figure 2 is a schematic representation of the device of Figure 1 in a second position
- - Figure 3 illustrates on an enlarged scale a strip in which is cut a magnetic flux generator according to the invention.
- Figures 1 and 2 illustrate a device 1 for determining the angular position ⁇ of a rotary member relative to a support.
- the rotary member is constituted by a hinge pin 2 of pedal guided in rotation relative to the structure 4 of the vehicle.
- the device 1 essentially comprises a magnetic flux generator 6 fixed to the articulation axis 2 and a sensor 8 of the magneto-resistive type fixed to the structure 4 of the vehicle.
- the magnetic flux generator 6 has the shape of a ring portion extending over an angular sector of approximately 135 degrees. As illustrated in FIG. 3, this magnetic flux generator is cut from a flexible strip 14 comprising a succession of lines 16 extending substantially in a direction 18. These lines 16 have a width I substantially constant perpendicular to the direction 18 They consist in a known manner of magnetizable metallic particles coated in foam. They are magnetized so as to constitute alternately north poles 10 and south poles 12.
- two consecutive lines 16 define a magnet generating a magnetic flux in a direction 30 extending perpendicular to the direction 18.
- the strip 14 consequently comprises a succession of magnets generating magnetic fluxes 32 of substantially parallel directions and alternating directions.
- the width I of each of the lines 16 must be sufficiently small so that after cutting the generator 6 of magnetic flux in the strip 14, two consecutive poles 10, 12 are hardly offset relative to each other in the direction 18, despite the non-rectilinear shape of the magnetic flux generator 6.
- the magnetic flux generator 6 therefore comprises at least 10 poles, here fifteen, and the width of the lines is less than 5 millimeters, preferably less than or equal to 2 millimeters.
- the sensor 8 comprises two magneto-resistive elements 20, 22 physically offset by 45 degrees and a microcontroller 24 to which the magneto-resistive elements 20, 22 are connected.
- the magneto-resistive element 20 generates an electrical signal 26 in the form of a voltage taking the value: A x sin 2a, where A is a constant and ⁇ the angle between the magneto-resistive element 20 and the magnetic flux 32 to which the the magneto-resistive element 20.
- the magneto-resistive element 22 being offset by 45 degrees relative to the magneto-resistive element 20, it generates an electrical signal 28 in the form of a voltage taking the value: A x cos 2 ⁇
- the electrical signals 26, 28 are collected by the microcontroller 24 which deduces the value of ⁇ to within 180 degrees.
- the generator 6 of magnetic flux 32 being fixed to the rotary member 2 and the sensor 8 being fixed to the structure 4 of the vehicle, the angle ⁇ is a function of the angular position ⁇ of the rotary member.
- these two angles are equal, so that the microcontroller 24 indicates the angular position ⁇ of the rotary member 2 relative to the structure of the vehicle from the signals 26, 28 provided by the resistive magnetos 20, 22.
- the magnetic flux 32 changes direction.
- the characteristics of the resistive magnetos elements 20, 22 which have just been described, in particular the periodicity of 180 degrees of the electrical signals
Landscapes
- 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
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/586,363 US7402997B2 (en) | 2004-01-21 | 2005-01-19 | Device for determination of the angular position of a rotating body |
JP2006550017A JP2007534934A (ja) | 2004-01-21 | 2005-01-19 | 回転体の角度位置を求める装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0400524 | 2004-01-21 | ||
FR0400524A FR2865273B1 (fr) | 2004-01-21 | 2004-01-21 | Dispositif pour determiner la position angulaire d'un organe rotatif |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005080920A2 true WO2005080920A2 (fr) | 2005-09-01 |
WO2005080920A3 WO2005080920A3 (fr) | 2005-11-24 |
Family
ID=34707964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/000471 WO2005080920A2 (fr) | 2004-01-21 | 2005-01-19 | Dispositif pour determiner la position angulaire d’un organe rotatif |
Country Status (6)
Country | Link |
---|---|
US (1) | US7402997B2 (fr) |
JP (1) | JP2007534934A (fr) |
KR (1) | KR20060123536A (fr) |
CN (1) | CN100451556C (fr) |
FR (1) | FR2865273B1 (fr) |
WO (1) | WO2005080920A2 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008042912A1 (de) * | 2008-10-16 | 2010-04-22 | Robert Bosch Gmbh | Sensoreinrichtung zum Erfassen der Drehlage eines rotierenden Bauteils |
DE102009040486B3 (de) * | 2009-09-08 | 2011-04-28 | Carl Freudenberg Kg | Magnetschaumsensor |
FR3082615B1 (fr) * | 2018-06-15 | 2020-10-16 | Electricfil Automotive | Methode de determination d'une position angulaire relative entre deux pieces |
JP2021188935A (ja) * | 2020-05-26 | 2021-12-13 | 株式会社デンソー | アクチュエータ制御装置、および、アクチュエータ制御方法 |
DE102020121895A1 (de) * | 2020-08-20 | 2022-02-24 | Bourns, Inc. | Sensor zum Erfassen einer Position |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4137512A (en) * | 1977-05-13 | 1979-01-30 | Illinois Tool Works Inc. | Contactless magnetic switch |
US4616281A (en) * | 1982-03-10 | 1986-10-07 | Copal Company Limited | Displacement detecting apparatus comprising magnetoresistive elements |
FR2727778B1 (fr) * | 1994-12-02 | 1997-01-03 | Commissariat Energie Atomique | Codeur magnetique pour la lecture de marques sur une piste magnetique associee |
DE19534995A1 (de) * | 1995-09-21 | 1997-03-27 | Bosch Gmbh Robert | Sensor zur Lenkradwinkelerfassung |
US5982169A (en) * | 1997-09-24 | 1999-11-09 | Eastman Kodak Company | Micro-encoder with molded micro-magnet |
JP2001304805A (ja) | 2000-04-25 | 2001-10-31 | Tokai Rika Co Ltd | 回転角度検出装置 |
DE10118806A1 (de) * | 2001-04-17 | 2002-10-24 | Philips Corp Intellectual Pty | Anordnung zum Bestimmen der Bewegungsrichtung eines Bewegungsgeberelements |
-
2004
- 2004-01-21 FR FR0400524A patent/FR2865273B1/fr not_active Expired - Lifetime
-
2005
- 2005-01-19 KR KR1020067016256A patent/KR20060123536A/ko not_active Withdrawn
- 2005-01-19 JP JP2006550017A patent/JP2007534934A/ja not_active Withdrawn
- 2005-01-19 US US10/586,363 patent/US7402997B2/en not_active Expired - Lifetime
- 2005-01-19 CN CNB2005800026570A patent/CN100451556C/zh not_active Expired - Lifetime
- 2005-01-19 WO PCT/EP2005/000471 patent/WO2005080920A2/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
KR20060123536A (ko) | 2006-12-01 |
US7402997B2 (en) | 2008-07-22 |
CN100451556C (zh) | 2009-01-14 |
FR2865273A1 (fr) | 2005-07-22 |
JP2007534934A (ja) | 2007-11-29 |
FR2865273B1 (fr) | 2006-03-03 |
WO2005080920A3 (fr) | 2005-11-24 |
CN1961200A (zh) | 2007-05-09 |
US20070159165A1 (en) | 2007-07-12 |
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