DE102012022869A1 - Steering angle sensor for device for combined acquisition of angle and rotational torque of steering column, has magnetic code track formed by magnetic ring of torque sensor connected to shaft portion and magnetic field sensor - Google Patents

Steering angle sensor for device for combined acquisition of angle and rotational torque of steering column, has magnetic code track formed by magnetic ring of torque sensor connected to shaft portion and magnetic field sensor

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Publication number
DE102012022869A1
DE102012022869A1 DE201210022869 DE102012022869A DE102012022869A1 DE 102012022869 A1 DE102012022869 A1 DE 102012022869A1 DE 201210022869 DE201210022869 DE 201210022869 DE 102012022869 A DE102012022869 A DE 102012022869A DE 102012022869 A1 DE102012022869 A1 DE 102012022869A1
Authority
DE
Germany
Prior art keywords
sensor
magnetic
angle
steering
steering column
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Withdrawn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
DE201210022869
Other languages
German (de)
Inventor
Ingo Swieter
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE201210022869 priority Critical patent/DE102012022869A1/en
Publication of DE102012022869A1 publication Critical patent/DE102012022869A1/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D15/00Steering not otherwise provided for
    • B62D15/02Steering position indicators ; Steering position determination; Steering aids
    • B62D15/021Determination of steering angle
    • B62D15/0215Determination of steering angle by measuring on the steering column
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D6/00Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical 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
    • G01D5/12Mechanical 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
    • G01D5/14Mechanical 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
    • G01D5/142Mechanical 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
    • G01D5/145Mechanical 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00Measuring torque, work, mechanical power, or mechanical efficiency in general
    • G01L3/02Rotary-transmission dynamometers
    • G01L3/04Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electrical or magnetic means for indicating
    • G01L3/101Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electrical or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/104Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electrical or magnetic means for indicating involving magnetic or electromagnetic means involving permanent magnets

Abstract

The steering angle sensor (3) has two magnetic code-tracks containing angle information (psi ,theta ) from which angle (phi ) of the shaft portion (4) of the steering column is judged. One of the magnetic code tracks is formed by multi-pole magnetic ring (9) of torque sensor (2) connected to the first shaft portion and a magnetic field sensor (11). An independent claim is included for device for combined acquisition of angle and rotational torque of steering column.

Description

  • The invention relates to a steering angle sensor, by means of which an angle of a steering column is determined and a device for the combined detection of an angle and a torque.
  • From the DE 195 06 938 A1 is such a steering angle sensor known. For this purpose, a first gear is arranged on the steering column, which rotates with the steering column. With the first gear on the steering column two other gears are connected, which have a different number of teeth. On the other two gears magnets are arranged, whose position is sensed by magnetic field sensors, in particular AMR sensors (anisotropic magnetoresistive - sensor). From the two angular positions of the two other gears can then be deduced by the angle of the steering column. The two angle information of the two other gears can also be referred to as a magnetic code track. The calculation is for example in the DE 10 2006 006 359 A1 described.
  • To reduce measurement errors, it is from the DE 199 62 241 A1 known to resiliently clamp the two other gears with the teeth on the steering column.
  • From the DE 202 20 388 U1 such as DE 10 2005 018 286 A1 there is known an apparatus for determining a torque applied to a shaft, the shaft having a first shaft portion and a second shaft portion. The two shaft sections are rotatable against each other. The first shaft portion is connected to a multi-pole magnetic ring surrounding the first shaft portion. A stator holder is secured to the second shaft portion, two stator elements being mounted on the stator holder and each stator element having axially projecting fingers uniformly distributed at least over part of the circumference and having gaps therebetween. The fingers of each stator element are connected to one another via a magnetic flux ring, wherein the magnetic flux rings are spaced apart and a magnetic field sensor is arranged between the magnetic flux rings, at least one magnetic flux concentrator being associated with the magnetic field sensor, the magnetic flux concentrator being provided between the magnetic flux rings.
  • From the WO 2012/019947 A1 a device is known, comprising a torque sensor for determining a torque of a steering shaft and a rotation angle sensor for determining a rotation angle of the steering shaft, wherein the torque sensor operates with the aid of a magnetic field, the rotation angle sensor comprises a permanent magnet and a magnetic field detector, wherein the magnetic field detector is adapted to Detecting direction of the magnetic field, and the torque sensor and the rotation angle sensor are arranged adjacent, wherein between the torque sensor and rotation angle sensor, a shielding device for magnetic fields is arranged and / or the permanent magnet of the rotation angle sensor is formed bipolar axially with a major axis.
  • The invention is based on the technical problem of providing a steering angle sensor which is easy to combine with a torque sensor and to provide a device for the combined detection of an angle and a torque. The solution of the technical problem results from the objects with the features of claims 1 and 7. Further advantageous embodiments of the invention will become apparent from the dependent claims.
  • The steering angle sensor, by means of which an angle of a steering column is determined, wherein the steering column has a first shaft portion and a second shaft portion which are rotatable against each other (preferably via a torsion bar) has two magnetic code tracks, from the angle information on the angle of the steering column, In particular, the angle of the first shaft portion is closed, wherein a magnetic code track of the steering angle sensor is formed by a first multipole magnet ring of a torque sensor which is connected to the first shaft portion and which is associated with a magnetic field sensor. That is, the multipole magnetic ring of the torque sensor is used for a magnetic code track of the steering angle sensor, so that the component cost is reduced. For this purpose, the magnetic ring is widened, that a part of the magnet ring protrudes from the sensor part of the torque sensor. The protruding from the sensor part of the torque sensor part of the magnetic ring then rotates with the first shaft portion and a magnetic field sensor can convert the magnetic values into angles.
  • For the second necessary magnetic code track, a second multipole magnetic ring with associated magnetic field sensor can be used, wherein preferably the number of pole pairs of the first and second multipole magnetic ring is different, so that again a calculable by vernier signal is available.
  • The second multipole magnetic ring can in principle be arranged on the first shaft section or on the second shaft section, wherein the arrangement on the first shaft section is preferred, since then the two angle information of the Multipole magnet rings no longer need to be converted. In an arrangement on the second shaft portion, however, the rotation of the two shaft sections must still be taken into account.
  • In an alternative embodiment, the second magnetic code track is formed by a toothed wheel which meshes with a toothing of the steering column, preferably of the first shaft section, wherein a magnet is arranged on the toothed wheel, whose rotating magnetic field is detected by a further magnetic field sensor. The number of teeth of the gear is preferably selected such that a nonius calculable signal is available, d. H. the number of teeth is selected as a function of the pole pairs of the multipole magnet ring.
  • In a further embodiment, the magnetic field sensors of the steering angle sensor are designed as MR sensors (magnetoresistive sensors), in particular as AMR sensors (anisotropic magnetoresistive sensors) or as GMR sensors (giant magnetoresistance).
  • The device for combined detection of an angle and a torque on a steering column comprises a torque sensor and a steering angle sensor, wherein the steering column has a first shaft portion and a second shaft portion which are rotatable relative to each other. The first shaft portion is connected to a multipole magnet ring of the torque sensor surrounding the first shaft portion. On the second shaft portion, a stator holder is mounted, wherein the steering angle sensor has two magnetic code tracks from the angle information is closed on the angle of the steering column, wherein a magnetic code track of the steering angle sensor is formed by the multipole magnet ring of the torque sensor, which is associated with another Megnetfeldsensor ,
  • The second magnetic code track is formed by a second multipole magnetic ring with an associated magnetic field sensor, wherein the second multipole magnetic ring is preferably arranged on the first shaft section. Alternatively, the second magnetic code track may be formed by a gear meshing with a toothing of the steering column with a magnet disposed on the gear.
  • The invention will be explained in more detail below with reference to preferred embodiments. The figures show:
  • 1 a schematic side view of a steering angle sensor with two multipole magnet rings and
  • 2 a schematic plan view with a gear as a second magnetic code track.
  • In the 1 is schematically a device 1 for the combined detection of an angle φ of a steering column and a torque on the steering column shown. The device 1 includes a torque sensor 2 and a steering angle sensor 3 , The steering column comprises a first shaft section 4 and a second shaft portion 5 that have a torsion bar 6 are rotatable against each other. The greatly simplified torque sensor 2 includes a stator holder 7 on the second wave section 5 is attached. Furthermore, the torque sensor comprises 2 a holder 8th for a multipole magnetic ring 9 , where the holder 8th fixed to the first shaft section 4 the steering column is connected. The multipole magnetic ring 9 lies above the torsion bar 6 , In this case, the torque sensor comprises 2 continue a magnetic field sensor 10 which is disposed between non-illustrated magnetic flux rings. With regard to the specific structure of the torque sensor 2 For example, on the DE 202 20 388 U1 or the DE 10 2005 018 286 A1 to get expelled. In contrast to the torque sensors shown there according to the invention is the multipole magnet ring 9 wider, so in particular a part of the multipole magnet ring 9 from the stator holder 7 protrudes. This outstanding part of the multipole magnet ring 9 is a magnetic field sensor 11 assigned. The outstanding part of the multipole magnet ring 9 and the magnetic field sensor 11 form a first magnetic code track of the steering angle sensor 3 , Indicates the multipole magnet ring 9 For example, eight pole pairs, so an angular resolution for θ of 22.5 ° can be achieved. Next, the steering angle sensor 3 another multipole magnetic ring 12 on top of a holder 13 on the first shaft section 4 is attached. The second multipole magnet ring 12 is another magnetic field sensor 14 associated with the second magnetic code track of the steering angle sensor 3 form. In this case, the number of pole pairs of the second multipole magnet ring is 12 different from the number of pole pairs of the first multipole magnet ring 9 , so that a vernier method for the angle φ of the first wave section 4 can be carried out. For this purpose, the angle information θ of the magnetic field sensor 11 and the angle information ψ of the magnetic field sensor 14 to an evaluation unit 15 transmitted.
  • In the 2 is part of the steering angle sensor 3 shown in an alternative embodiment. The second magnetic code track is a gearwheel 16 with a magnet 17 formed, with the magnet 17 is preferably designed as a bar magnet. The gear 16 stands thereby with a gearing 18 on the first shaft section 4 in connection. This will be the number of teeth of the gear 16 chosen such that a calculable by vernier signal in comparison to the signal of the first multipole magnet ring 9 is produced.
  • LIST OF REFERENCE NUMBERS
  • 1
    contraption
    2
    torque sensor
    3
    Rotation angle sensor
    4
    shaft section
    5
    shaft section
    6
    torsion bar
    7
    stator
    8th
    holder
    9
    Multi-pole magnetic ring
    10
    magnetic field sensor
    11
    magnetic field sensor
    12
    Multi-pole magnetic ring
    13
    holder
    14
    magnetic field sensor
    15
    evaluation
    16
    gear
    17
    magnet
    18
    gearing
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 19506938 A1 [0002]
    • DE 102006006359 A1 [0002]
    • DE 19962241 A1 [0003]
    • DE 20220388 U1 [0004, 0017]
    • DE 102005018286 A1 [0004, 0017]
    • WO 2012/019947 A1 [0005]

Claims (9)

  1. Steering angle sensor ( 3 ), by means of which an angle (φ) of a steering column is determined, wherein the steering column has a first shaft section (FIG. 4 ) and a second shaft section ( 5 ), which are mutually rotatable, wherein the steering angle sensor ( 3 ) has two magnetic code tracks, from the angle information (ψ, θ) on the angle (φ) of the steering column, in particular the angle (φ) of the first shaft section is closed, characterized in that a magnetic code track of the steering angle sensor ( 3 ) by a first multipole magnetic ring ( 9 ) of a torque sensor ( 2 ) formed with the first shaft portion ( 4 ) and a magnetic field sensor ( 11 ) assigned.
  2. Steering angle sensor according to claim 1, characterized in that the second magnetic code track by a second multipole magnetic ring ( 12 ) with associated magnetic field sensor ( 14 ) is formed.
  3. Steering angle sensor according to claim 2, characterized in that the number of pole pairs of the first and the second multipole magnet ring ( 9 . 12 ) are different.
  4. Steering angle sensor according to claim 2 or 3, characterized in that the second multipole magnetic ring ( 12 ) with the first shaft section ( 4 ) or the second shaft section ( 5 ) connected is.
  5. Steering angle sensor according to claim 1, characterized in that the second magnetic code track by a gear ( 16 ) formed with a toothing ( 18 ) of the steering column is engaged, wherein on the gear ( 16 ) a magnet ( 17 ) is arranged.
  6. Steering angle sensor according to one of the preceding claims, characterized in that the magnetic field sensors ( 11 . 14 ) are designed as MR sensors.
  7. Contraption ( 1 ) for combined detection of an angle (φ) and a torque on a steering column, the device comprising a torque sensor ( 2 ) and a steering angle sensor ( 3 ), wherein the steering column has a first shaft section ( 4 ) and second shaft section ( 5 ), which are rotatable against each other, wherein the first shaft portion ( 4 ) with a multipole magnetic ring ( 9 ) of the torque sensor ( 2 ) connecting the first shaft section ( 4 ), wherein at the second shaft portion ( 5 ) a stator holder ( 7 ) of the torque sensor ( 2 ), wherein the steering angle sensor ( 3 ) has two magnetic code tracks, from the angle information (ψ, θ) on the angle (φ) of the steering column is closed, wherein a magnetic code track of the steering angle sensor ( 3 ) through the multipole magnetic ring ( 9 ) of the torque sensor ( 2 ), to which a magnetic field sensor ( 11 ) assigned.
  8. Apparatus according to claim 7, characterized in that the second magnetic code track by a second multipole magnetic ring ( 12 ) with associated magnetic field sensor ( 14 ) is formed.
  9. Apparatus according to claim 7, characterized in that the second magnetic code track by a gear ( 16 ) formed with a toothing ( 18 ) of the steering column is engaged, wherein on the gear ( 16 ) a magnet ( 17 ) is arranged.
DE201210022869 2012-11-21 2012-11-21 Steering angle sensor for device for combined acquisition of angle and rotational torque of steering column, has magnetic code track formed by magnetic ring of torque sensor connected to shaft portion and magnetic field sensor Withdrawn DE102012022869A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201210022869 DE102012022869A1 (en) 2012-11-21 2012-11-21 Steering angle sensor for device for combined acquisition of angle and rotational torque of steering column, has magnetic code track formed by magnetic ring of torque sensor connected to shaft portion and magnetic field sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210022869 DE102012022869A1 (en) 2012-11-21 2012-11-21 Steering angle sensor for device for combined acquisition of angle and rotational torque of steering column, has magnetic code track formed by magnetic ring of torque sensor connected to shaft portion and magnetic field sensor

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DE102012022869A1 true DE102012022869A1 (en) 2014-05-22

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DE201210022869 Withdrawn DE102012022869A1 (en) 2012-11-21 2012-11-21 Steering angle sensor for device for combined acquisition of angle and rotational torque of steering column, has magnetic code track formed by magnetic ring of torque sensor connected to shaft portion and magnetic field sensor

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506938A1 (en) 1995-02-28 1996-08-29 Bosch Gmbh Robert Method and device for measuring the angle of a rotatable body
DE19962241A1 (en) 1999-12-22 2001-07-12 Ruf Electronics Gmbh Position sensor to detect rotation position of shaft, e.g. steering wheel shaft; is coupled to shaft by driven gear and toothing or driving gear of shaft, which are coupled by elastic clamp clips
DE10036281A1 (en) * 2000-07-26 2002-02-07 Bosch Gmbh Robert Determination of a rotating axle angular position by use of two signal wheels with signal tracks comprised of magnetic poles the signal tracks of which are detected by sensors linked to an analysis device for high resolution
DE20220388U1 (en) 2002-11-28 2003-08-14 Valeo Schalter & Sensoren Gmbh Device for measurement of the torque applied to a shaft, e.g. a motor vehicle steering wheel shaft, has a flux concentrator that enables a magnetic field sensor to be securely positioned so that it is insensitive to tolerances
DE102004023801A1 (en) * 2004-01-20 2005-08-25 Valeo Schalter Und Sensoren Gmbh Steering angle sensor for use on road vehicle to determine resultant torque applied to steering column uses two relatively rotatable shaft portions and has multi-pole magnet ring and stator holder
US20060042403A1 (en) * 2003-09-02 2006-03-02 Koji Oike Device for detecting absolute rotation angle and torque
DE102005018286A1 (en) 2005-04-13 2006-10-19 Valeo Schalter Und Sensoren Gmbh Torque determining device e.g. torque sensor, for use on steering shaft of motor vehicle, has stator units having fingers connected with each other by rings, and three magnetic field sensors exposed to same magnetic field
DE102006006359A1 (en) 2006-02-11 2007-08-16 Leopold Kostal Gmbh & Co. Kg Angle of rotation sensor and method for determining the absolute angular position of a body rotatable over several rounds
WO2012019947A1 (en) 2010-08-09 2012-02-16 Valeo Schalter Und Sensoren Gmbh Device comprising a torque sensor and a rotation angle sensor
DE102011002563A1 (en) * 2010-12-20 2012-06-21 Robert Bosch Gmbh Sensor arrangement

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506938A1 (en) 1995-02-28 1996-08-29 Bosch Gmbh Robert Method and device for measuring the angle of a rotatable body
DE19962241A1 (en) 1999-12-22 2001-07-12 Ruf Electronics Gmbh Position sensor to detect rotation position of shaft, e.g. steering wheel shaft; is coupled to shaft by driven gear and toothing or driving gear of shaft, which are coupled by elastic clamp clips
DE10036281A1 (en) * 2000-07-26 2002-02-07 Bosch Gmbh Robert Determination of a rotating axle angular position by use of two signal wheels with signal tracks comprised of magnetic poles the signal tracks of which are detected by sensors linked to an analysis device for high resolution
DE20220388U1 (en) 2002-11-28 2003-08-14 Valeo Schalter & Sensoren Gmbh Device for measurement of the torque applied to a shaft, e.g. a motor vehicle steering wheel shaft, has a flux concentrator that enables a magnetic field sensor to be securely positioned so that it is insensitive to tolerances
US20060042403A1 (en) * 2003-09-02 2006-03-02 Koji Oike Device for detecting absolute rotation angle and torque
DE102004023801A1 (en) * 2004-01-20 2005-08-25 Valeo Schalter Und Sensoren Gmbh Steering angle sensor for use on road vehicle to determine resultant torque applied to steering column uses two relatively rotatable shaft portions and has multi-pole magnet ring and stator holder
DE102005018286A1 (en) 2005-04-13 2006-10-19 Valeo Schalter Und Sensoren Gmbh Torque determining device e.g. torque sensor, for use on steering shaft of motor vehicle, has stator units having fingers connected with each other by rings, and three magnetic field sensors exposed to same magnetic field
DE102006006359A1 (en) 2006-02-11 2007-08-16 Leopold Kostal Gmbh & Co. Kg Angle of rotation sensor and method for determining the absolute angular position of a body rotatable over several rounds
WO2012019947A1 (en) 2010-08-09 2012-02-16 Valeo Schalter Und Sensoren Gmbh Device comprising a torque sensor and a rotation angle sensor
DE102011002563A1 (en) * 2010-12-20 2012-06-21 Robert Bosch Gmbh Sensor arrangement

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