DE102005031806A1 - Rotation angle sensor - Google Patents

Rotation angle sensor

Info

Publication number
DE102005031806A1
DE102005031806A1 DE102005031806A DE102005031806A DE102005031806A1 DE 102005031806 A1 DE102005031806 A1 DE 102005031806A1 DE 102005031806 A DE102005031806 A DE 102005031806A DE 102005031806 A DE102005031806 A DE 102005031806A DE 102005031806 A1 DE102005031806 A1 DE 102005031806A1
Authority
DE
Germany
Prior art keywords
angle
magnetic
characterized
rotation
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.)
Withdrawn
Application number
DE102005031806A
Other languages
German (de)
Inventor
Wolfgang Abele
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 Automotive Steering GmbH
Original Assignee
Robert Bosch Automotive Steering 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 Automotive Steering GmbH filed Critical Robert Bosch Automotive Steering GmbH
Priority to DE102005031806A priority Critical patent/DE102005031806A1/en
Publication of DE102005031806A1 publication Critical patent/DE102005031806A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01D5/244Mechanical 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 characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/24428Error prevention
    • 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

Abstract

The invention relates to a rotational angle sensor, in particular for measuring a rotational angle of a steering shaft of a steering system, with a disc or annular support which is fixed on a shaft transverse to its longitudinal axis and has a track of magnetic north and south poles, the track of a magnetic angle sensor is detected.
In order to provide a rotation angle sensor with which even after an interruption of the power supply, an absolute rotation angle over a range which is greater than 360 °, detectable, it is provided to additionally detect the periodic angle information of the angle sensor of a magnetic counter and by a Transform calculation device in a multiturn angle.

Description

  • The The invention relates to a rotation angle sensor, in particular for measurement a rotation angle of a steering shaft of a steering system, according to the preamble of claim 1.
  • The DE 102 10 372 A1 describes a rotational angle sensor with high angular resolution wherein a first track of magnetic north and south poles is arranged on a designed as a pole wheel disk or annular support. The carrier of the first track of magnetic north and south poles is arranged transversely to a longitudinal axis of a shaft and rotatably connected to the shaft. With a magnetic angle sensor, the rotational position of the shaft is detected. In order to enable a high resolution of the rotation angle of the shaft, a second track of magnetic north and south poles with, compared to the first track, substantially smaller arc lengths of the magnetic poles on the disc or annular support is arranged. The second track is measured by a second magnetic field sensor and an angle function, the signals of the magnetic angle sensors are linearized. With such a rotation angle sensor, rotational positions of a shaft in the range up to 360 ° high resolution can be determined. However, such a rotation angle sensor requires a separate counter module and a separate memory module and is not able to reproduce the rotational position of the shaft in an interruption of the supply voltage or represent a 360 ° beyond rotational position of the shaft.
  • The DE 198 39 446 A1 describes a further rotation angle sensor which allows an absolute angle measurement over a range of 0 ° to 360 °. Two anisotropic magnetoresistive thin-film sensors are connected in each case to two Wheatstone bridges and serve to extract an angle-dependent useful signal as a function of the orientation of the sensors to form an external magnetic field. To distinguish the two respective angle ranges from 0 ° to 180 ° and 180 ° to 360 °, an auxiliary magnetic field is briefly applied to the sensor circuit, whereby the voltage signals generated by the Wheatstone bridges change. These signal changes are evaluated in an area function, whereby an angle measurement over a range of 0 ° to 360 ° is possible with the rotation angle sensor. An interruption of the supply voltage requires an initialization.
  • Of the Invention is based on the object, a rotation angle sensor with which even after an interruption of its power supply an absolute angle of rotation an area larger than 360 °, is recognized.
  • The Task is with a rotation angle sensor with the features of the claim 1 solved.
  • Thereby that a combination of the magnetic angle sensor, which the Rotational position of the disc or annular carrier of the track of magnetic North and south poles detected, with a magnetic counter, its resistivity is also at a rotation angle greater than 360 °, significantly changes, and which counts the periodic angle information of the angle sensor and this periodic angle information from a computing device be transformed into a multi-turn angle, in a rotation angle sensor is provided, the rotation angle sensor according to the invention in the Location, high resolution to detect a rotational angle position of the shaft. Even after a break in the Supply voltage for the rotation angle sensor, this is possible because of the magnetic counter as storage for Turning angle of more than 360 ° suitable is. Its resistivity changes significantly over several turns of the track of magnetic north and south poles the disc or annular carrier in discrete angular segments of for example 180 °. The storage the angular position is done in the magnetic counter thus de-energized. The magnetic counter is sensor and memory at the same time.
  • preferred versions The invention will become apparent from the dependent claims.
  • Of the magnetic counters and the calculating means form a unit in the form of a sensor. The magnetic counter is preferably provided as a strip conductor, which in the manner of a GMR sensor from a multi-layer structure consisting of a variety ferromagnetic transition metal layers and layers made of non-magnetic metal. He has a number of spirally with mutually parallel straight sections. On one Silitium substrate can be the following layer sequence of the multilayer structure be constructed: tantalum with an aluminum contact - antiferromagnet - reference layer (CoFe) - nonmagnetic Layer - sensor layer (NiFe / CoFe) - tantalum.
  • In such multilayer structures, a giant magnetoresistance effect occurs under the influence of an external magnetic field, with the relative orientation of the magnetizations of the successive ferromagnetic layers changing changed. The resistivity of the GMR sensor changes as a result. In narrow stripe-shaped and spirally nested multi-layer structures form domain walls, ie area in which the magnetization rotates through 180 ° over a certain distance. The respective domain wall separates areas in which the magnetization deviates from each other by 180 °. Upon rotation of the disc or annular support of a track of north and south magnetic poles on the magnetic counter, as each pole pair advances, the magnetization in the multilayer structure and the resistivity of the magnetic counter significantly change over several revolutions of the disc or ring Carrier is and can be measured via a current applied to the magnetic counter current.
  • Also in the de-energized state of the magnetic counter remains the resistivity for the respective angle of rotation the disc or annular Carrier significantly received, so that one any interruption of the power supply of the rotation angle sensor meaningless is and does not require initialization. To the relatively rough resolution of the magnetic counter to refine is the magnetic angle sensor scanning the pole pairs preferably designed as a sensitive MR, GMR or Hall sensor. In a particularly for a steering system for a motor vehicle provided embodiment of the rotation angle sensor, is the magnetic counter equipped with at least 3 tracks and preferably with 12 tracks and the disc or annular carrier has at least 1 pole pair of magnetic north and south poles and prefers 8 north and south poles (4 pole pairs). The magnetic angle sensor and the magnetic counter formed rotational angle sensor is preferably arranged on a printed circuit board and its count or resistivity changes are detected by the computing device, which has a high-resolution angle of rotation a shaft designed as a steering shaft determined.
  • Of the high-resolution Rotation angle can be used as setpoint for a regulation of the steering system, for example, as steer-by-wire steering is built, serve. The steering system may be for any vehicle, in particular but for a passenger vehicle or for to serve a commercial vehicle.
  • It may be appropriate in the rotation angle sensor multiple magnetic counter and multiple magnetic Angle sensors redundant to connect to a high reliability to ensure the rotation angle sensor. The rotation angle sensor can also locally and functional with respect to the connection to the computing device be combined with a torque sensor.

Claims (13)

  1. A rotation angle sensor, in particular for measuring a rotation angle of a steering shaft of a steering system, having a disc-shaped or annular carrier which is fixed on a shaft transverse to its longitudinal axis and has a track of magnetic north and south poles, the track being detected by a magnetic angle sensor, characterized in that the periodic angle information of the angle sensor is counted by a magnetic counter and transformed by a computing device into a multiturn angle.
  2. Angle of rotation sensor according to claim 1, characterized in that that the calculating means and the magnetic counter a Form unity.
  3. Angle of rotation sensor according to claim 1 or 2, characterized characterized in that the magnetic counter consists of a number of tracks of spiral, with parallel sections of straight sections of multilayer structures is formed, whose resistivity depends on the number of revolutions of the disc or annular carrier.
  4. Angle of rotation sensor according to one of claims 1 to 3, characterized in that the magnetic counter a Has a trace number of at least 3.
  5. Angle of rotation sensor according to claim 4, characterized in that that the magnetic counter has a trace number of 12.
  6. Angle of rotation sensor according to one of claims 1 to 5, characterized in that the disc or annular support at least 1 pole pair has.
  7. Angle of rotation sensor according to claim 6, characterized in that that the disc or annular support 8 poles having.
  8. Angle of rotation sensor according to one of claims 1 to 7, characterized in that the magnetic angle sensor a MR, a GMR or a Hall sensor is.
  9. Angle of rotation sensor according to one of claims 1 to 8, characterized in that the magnetic angle sensor and the magnetic counter are arranged on a circuit board and their count or resistivity change detected by the calculation device and an absolute, high-resolution rotation angle the wave is determined.
  10. Angle of rotation sensor according to one of claims 1 to 9, characterized in that the shaft, the steering shaft or coupled to the steering shaft Wave is a steering system of a passenger or commercial vehicle.
  11. Angle of rotation sensor according to one of claims 1 to 10, characterized in that the rotation angle sensor has a plurality of magnetic counter and a plurality of magnetic angle sensors.
  12. Angle of rotation sensor according to claim 11, characterized in that that the magnetic counters and the magnetic angle sensors are connected redundantly.
  13. Angle of rotation sensor according to one of claims 1 to 12, characterized in that the rotation angle sensor with a Torque sensor is combined.
DE102005031806A 2005-07-07 2005-07-07 Rotation angle sensor Withdrawn DE102005031806A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102005031806A DE102005031806A1 (en) 2005-07-07 2005-07-07 Rotation angle sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005031806A DE102005031806A1 (en) 2005-07-07 2005-07-07 Rotation angle sensor
PCT/EP2006/063998 WO2007006742A1 (en) 2005-07-07 2006-07-07 Angle of rotation sensor

Publications (1)

Publication Number Publication Date
DE102005031806A1 true DE102005031806A1 (en) 2007-01-11

Family

ID=36808892

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102005031806A Withdrawn DE102005031806A1 (en) 2005-07-07 2005-07-07 Rotation angle sensor

Country Status (2)

Country Link
DE (1) DE102005031806A1 (en)
WO (1) WO2007006742A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9114833B2 (en) 2010-05-14 2015-08-25 Trw Automotive Gmbh Sensor assembly for motor vehicle steering systems
DE102016120547A1 (en) * 2016-10-27 2018-05-03 Max Baermann Holding Ag Sensor device in a steering system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19839446A1 (en) * 1998-08-29 2000-03-02 Bosch Gmbh Robert Arrangement for detecting the angle of rotation of a rotatable element
DE10210372A1 (en) * 2002-03-08 2003-09-25 Siemens Ag Rotational angle sensor, comprises a pole wheel with coarse and fine magnetic traces and Hall sensor magnetic field detectors, with the coarse trace used for quick position determination and the fine trace used for high resolution
DE10309027A1 (en) * 2003-03-01 2004-09-16 Micro-Hybrid Electronic Gmbh Absolute angle measuring device, has two rings with Archemedes spirals scanned by sensors on radius, with additional sensors lying outside radius
US6864681B1 (en) * 2004-02-02 2005-03-08 Trw Automotive U.S. Llc Sensor assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11513797A (en) * 1995-10-17 1999-11-24 サイエンティフィック ジェネリクス リミテッド Position detection encoder
US6528990B1 (en) * 1996-03-22 2003-03-04 Mts Systems Corporation Magnetostrictive linear displacement transducer for a vehicle steering system
DE10334869B3 (en) * 2003-07-29 2004-09-16 Tech3 E.K. Rotation angle sensor has a rotating shaft with attached permanent magnets, with angular measurements based on both axial displacement of the shaft and sinusoidal and cosinusoidal signals generated by it

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19839446A1 (en) * 1998-08-29 2000-03-02 Bosch Gmbh Robert Arrangement for detecting the angle of rotation of a rotatable element
DE10210372A1 (en) * 2002-03-08 2003-09-25 Siemens Ag Rotational angle sensor, comprises a pole wheel with coarse and fine magnetic traces and Hall sensor magnetic field detectors, with the coarse trace used for quick position determination and the fine trace used for high resolution
DE10309027A1 (en) * 2003-03-01 2004-09-16 Micro-Hybrid Electronic Gmbh Absolute angle measuring device, has two rings with Archemedes spirals scanned by sensors on radius, with additional sensors lying outside radius
US6864681B1 (en) * 2004-02-02 2005-03-08 Trw Automotive U.S. Llc Sensor assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9114833B2 (en) 2010-05-14 2015-08-25 Trw Automotive Gmbh Sensor assembly for motor vehicle steering systems
DE102016120547A1 (en) * 2016-10-27 2018-05-03 Max Baermann Holding Ag Sensor device in a steering system

Also Published As

Publication number Publication date
WO2007006742A1 (en) 2007-01-18

Similar Documents

Publication Publication Date Title
US8749229B2 (en) Rotation angle sensor
US20150061658A1 (en) Xmr angle sensors
JP3705809B2 (en) Sensor that detects the angular position of the shaft
EP0893668B1 (en) Angle sensor
US10677859B2 (en) Minimum magnetic field detection systems and methods in magnetoresistive sensors for magnetic field strength and magnetic field angle detection
US8680850B2 (en) Magnetic field angular sensor and sensing method
EP0680614B1 (en) Device for detecting the angular position of an object
US6831456B2 (en) Angle sensor and method of increasing the anisotropic field strength of a sensor unit of an angle sensor
JP5062449B2 (en) Rotating magnetic field sensor
US8004277B2 (en) Rotary position sensing apparatus
US8638090B2 (en) Magnetic sensor system and method
JP4411319B2 (en) Magnetoresistive sensor for angle or position determination
CN101672902B (en) Magnetic field sensor array for measuring spatial components of a magnetic field
US8207732B2 (en) Magneto-resistive sensor for measuring a magnetic field based on an anisotropic magneto-resistive (AMR) effect or a gigantic magneto-resistive (GMR) effect
JP4406509B2 (en) Rotation angle capture device for rotatable elements
US20130218517A1 (en) Rotation Angle Sensor for Absolute Rotation Angle Determination Even Upon Multiple Revolutions
CN104749536B (en) Device, magnetic sensor device and method
DE102007032867B4 (en) Magnetoresistive magnetic field sensor structures and manufacturing methods
US9506996B2 (en) Apparatus and method for detecting an error in a measurement of a quantity
JP4991322B2 (en) Displacement sensor using GMR element, angle detection sensor using GMR element, and semiconductor device used therefor
US10656004B2 (en) Measuring device and method for measuring the level of a liquid in a container
DE102011083249A1 (en) Rotating field sensor
DE102011080679A1 (en) Rotating field sensor
JP5973498B2 (en) Magnetic angle sensor and magnetic tunnel junction element
CN101995558B (en) Magnetic sensor

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8110 Request for examination paragraph 44
R120 Application withdrawn or ip right abandoned

Effective date: 20140123