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
• • 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

Definitions

• the invention is based on a sensor arrangement for position detection on a moving component according to the preamble of independent patent claim 1.
• Speed sensors and position sensors are known from the prior art, which can detect and evaluate a rotational movement or a position change by detecting a corresponding change in a magnetic field.
• Magnetic sensors which are generally known per se and which can be designed as Hall sensors, AMR sensors, GMR sensors, TMR sensors or, in general, as xMR sensors, depending on the application and area of use, are used, for example, for controlling motors or in gearboxes. or vehicle dynamics systems can be used in motor vehicles.
• ASICs sensitive elements or evaluation modules
• At least two movable magnets are usually used in the case of path or angle measurement by detecting a change in the magnetic angle over the path or angle. These provide a common magnetic field with the largest possible ( ⁇ 360 °) magnetic angle change over the actuation path or operating angle and at the same time a defined magnetic field
• the detection of the rotating or rotating magnetic field vector is essential. This rotational movement of the magnetic field vector is detected by the sensitive sensing element, which may be part of an ASIC (Application Specific Integrated Circuit). This is done, for example, in the case of a two-dimensional or three-dimensional Hall sensor by indirect angle detection via an arc tangent function of the directed magnetic flux densities.
• DE 10 2009 055 104 A1 discloses, for example, a magnetic field sensor arrangement for detecting the position of moving components, in which spatial components of the magnetic field of a magnet system on the moving component change in their direction over the path to be detected, thereby corresponding to their position relative to a stationary sensor is detectable.
• the sensor arrangement according to the invention for path detection on a moving component with the features of independent claim 1 has the advantage that at least one small and thus inexpensive magnet in the fixed part of the application or in the sensor housing is arranged, for example, directly in the vicinity of the sensitive measuring element.
• the stationary magnetic circuit in the fixed part of the application may have one or more small magnets.
• large measuring ranges, which consist of a sensitive measuring range and of a fixed clamping range with at least one stationary magnet by at least one smaller and thus cheaper magnet on the moving part of the application instead of as previously by two much longer magnets on the moving lent part will be realized.
• the integration of the at least one useful magnet can be facilitated in an advantageous manner.
• the at least one fixed magnet acts as a support magnet and can also be designed very small and thus cost, since it can be mounted very close to the sensitive measuring element.
• the supporting magnet can likewise lie on the printed circuit board, for example next to or on the opposite printed circuit board side of the sensitive measuring element.
• Embodiments of the invention can be used with all position and / or angle encoders that evaluate the change in the magnetic flux density direction, such as Hall sensors, in particular so-called 2D or 3D Hall sensors or xMR sensors, such as AMR or GMR sensors.
• Particularly sensitive measuring elements which measure the flux density in two or three spatial directions offer numerous possibilities by combining magnetization direction of the magnets and the arrangement of the at least one support magnet to the at least one useful magnet to meet the requirements of the sensitive measuring elements, such as 3D Hall sensors with at least one flux concentrator.
• the movable at least one useful magnet provides for the rotation of the magnetic field vector at the location of the fixed sensitive measuring element and thus for the signal change in the sensitive measuring range.
• the fixed at least one support magnet provides for a fixed non-rotating magnetic field vector and a sufficient flux density at the location of the fixed sensitive measuring element as soon as the at least one useful magnet has moved too far away from the stationary sensitive measuring element.
• the magnetic field generated by the fixed at least one support magnet and the non-rotating magnetic field vector can be used to generate a constant output signal in the fixed clamping region.
• the at least one support magnet is expediently oriented in such a way that its magnetization direction at the moment when the at least one useful magnet leaves the measuring range of the sensitive measuring element retains the last-measured magnetic field direction, ie provides a constant measuring angle, which in the course of the previous measurement up to the time of leaving the measuring range of the sensitive measuring element was not previously measured by the at least one useful magnet.
• Embodiments of the present invention provide a sensor assembly for sensing displacement on a moving component, wherein at least one spatial component of a magnetic field of a magnetic sensing assembly changes by the movement of the component over the path to be detected and thereby the position of the moving member relative to a moving member stationary sensitive measuring element is detectable.
• at least one useful magnet which is connected to the moving component, and at least one support magnet, which is arranged stationarily in the measuring range of the sensitive measuring element, generate the magnetic field.
• the stationary at least one support magnet generates a constant stationary first magnetic field vector at the location of the sensitive measuring element.
• the fixed constant first magnetic field vector of the fixed at least one support magnet may have a predetermined angle with respect to a normal of the measurement surface of the sensitive measurement element at the location of the sensitive measurement element.
• the movable at least one useful magnet when entering the measuring range of the sensitive measuring element at the location of the sensitive measuring element generate a rotating second magnetic field vector whose magnetic field superimposed on the magnetic field of the at least one support magnet.
• a plurality of useful magnets or only one useful magnet can be connected to the moving component. When using several useful magnets, these can be made smaller than a single useful magnet in order to generate the rotating second magnetic field vector at the location of the sensitive measuring element.
• the magnetizations of the at least one useful magnet and the at least one supporting magnet can have a predetermined angle to one another. Due to the given magnetization directions of the magnets, a predetermined angular range of the magnetic field vectors with respect to a normal of the measuring surface of the sensitive measuring element can be specified at the location of the sensitive measuring element, so that the magnetic circuit of the sensor arrangement can be easily adapted to different applications and / or installation spaces by the arbitrary magnetization angles can.
• the sensitive measuring element can be arranged on a printed circuit board which has a first surface and a second surface.
• the stationary at least one support magnet can be arranged, for example, on the same surface of the printed circuit board next to the sensitive measuring element or on another surface of the printed circuit board below or next to the sensitive measuring element or in a through hole of the printed circuit board.
• the at least one support magnet is preferably arranged as close as possible to the sensitive measuring element, ie with the smallest possible distance to the sensitive measuring element.
• the possible arrangement positions of the individual support magnets can be combined.
• the angle of the fixed magnetic field vector with respect to the normal of the measuring surface of the sensitive measuring element can be simply predetermined in an advantageous manner at the location of the sensitive measuring element.
• the direction of the supporting magnetic field is selected to suit the location of the supporting magnet and the magnetization of the movable at least one useful magnet.
• the fixed support magnet can be mounted together with a ferromagnetic flux guide.
• the sensitive measuring element can be designed as part of an evaluation module.
• the evaluation module is preferably designed as an ASIC (application-specific integrated circuit).
• the path to be detected may represent a translational movement or a rotational movement.
• FIG. 1 shows a schematic sectional view of an exemplary embodiment of a sensor arrangement according to the invention for detecting travel on a moving component.
• FIG. 2 shows a schematic perspective illustration of the individual components of the magnetic measuring arrangement for the sensor arrangement according to the invention for position detection on a moving component from FIG. 1.
• Fig. 3 shows a side view of the magnetic measuring arrangement for the representation of different positions for the arrangement of a support magnet for the magnetic measuring arrangement.
• FIG. 4 shows a plan view of the magnetic measuring arrangement of FIG. 3.
• FIG. 5 shows a side view of the magnetic measuring arrangement for illustrating further positions for arranging a supporting magnet for the magnetic measuring arrangement.
• FIG. 6 shows a plan view of the magnetic measuring arrangement of FIG. 5.
• FIG. FIGS. 7 and 8 each show a characteristic curve of the magnetic measuring arrangement of FIG. 2.
• the illustrated embodiment of a sensor arrangement 1 for path detection on a moving component 5 comprises a magnetic measuring arrangement 10, wherein at least one spatial component of a magnetic field of the magnetic measuring arrangement 10 by the movement of the component 5 via change the path to be detected R and thereby the position of the moving component 5 with respect to a stationary sensitive measuring element 16.1 is detectable.
• at least one useful magnet 18, which is connected to the moving component 5, and at least one support magnet 12, which is arranged stationarily in the measuring range of the sensitive measuring element 16. generate the magnetic field.
• the moving member 5 represents a moving piston, which is moved translationally in a cylinder 7 of a brake booster, for example by a brake pedal operation.
• the at least one support magnet 12 and an evaluation module 16 embodied, for example, as an ASIC, are arranged stationarily on a printed circuit board 14, which is fastened to a housing 3 of the brake booster.
• the sensitive measuring element 16. 1 is designed as part of the evaluation module 16.
• the fixed at least one support magnet 12 generates a constant fixed first magnetic field vector at the location of the sensitive measuring element 16.1.
• the constant stationary first magnetic field vector of the fixed at least one support magnet 12 at the location of the sensitive measuring element 16.1 has a predetermined angle with respect to a normal of the measuring surface of the sensitive measuring element 16.1.
• the intensity or length of the magnetic field vector is dependent on the distance LI between the support magnet 12 and the sensitive measuring element 16.1.
• the movable at least one useful magnet 18, upon entering the measuring range of the sensitive measuring element 16.1 at the location of the sensitive measuring element 16.1, generates a rotating second magnetic field vector whose magnetic field superimposes the magnetic field of the at least one supporting magnet 12.
• the measuring range of the sensitive measuring element 16.1 is represented by a distance A in FIG.
• the intensity or current length of the rotating magnetic field vector of the moving at least one useful magnet 18 at the location of the stationary sensitive measuring element 16.1 is dependent on the distance to the sensitive measuring element 16.1.
• the maximum length of the rotating magnetic field vector is dependent on the air gap L2 between the at least one useful magnet 18 and the sensitive measuring element 16.1.
• the magnetizations of the at least one useful magnet 18 and the at least one support magnet 12 have a predetermined angle to one another.
• the stationary at least one support magnet 12 and the sensitive measuring element 16. 1 can be arranged on different surfaces 14. 1, 14. 2 of the printed circuit board 14.
• the angle of the fixed magnetic field vector with respect to the normal of the measuring surface of the sensitive measuring element 16.1 in an advantageous manner be specified.
• Fig. 3 and 4 various possible positions for the arrangement of the dashed supporting magnets 12 are shown.
• the support magnet can be arranged, for example, directly above the sensitive measuring element 16.1 or at a predetermined angle with different distances to the sensitive measuring element 16.1.
• the support magnet 12 may be arranged in an embodiment not shown on the same surface 14.1 or 14.2 of the circuit board 14 adjacent to the sensitive measuring element 16.1 or in a through hole of the circuit board 14.
• the at least one support magnet 12 is preferably as close as possible to the sensitive measuring element 16.1, ie arranged with the smallest possible distance to the sensitive measuring element 16.1.
• the movable at least one useful magnet 18 in the exemplary embodiment shown is magnetized from the right (N) to the left (S), i. the north pole N is arranged on the right and the south pole S is arranged on the left, wherein in the illustrated embodiment only one useful magnet 18 is used.
• a plurality of useful magnets 18 with matched magnetization directions and positions on the moving component 5 can be used to generate the rotating second magnetic field vector at the location of the sensitive measuring element 16.1.
• the at least one useful magnet 18 may also have a direction of magnetization in the representation from top to bottom, i. North pole N top, south pole S bottom, or bottom to top, i. South pole above, north pole N below.
• the at least one useful magnet 18 can also have an oblique magnetization direction.
• no magnetization direction is indicated.
• different magnetization directions for the at least one support magnet 12 can be specified.
• the at least one support magnet 12 may be magnetized in the same direction as the at least one useful magnet 18, that is, from right to left.
• the at least one support magnet 12 may have an oblique magnetization direction.
• the directions of magnetization of the at least one support magnet 12 and of the useful magnet 18 also allow the specification of the direction of the corresponding magnetic field vectors at the location of the sensitive measuring element 16.1.
• the magnetization directions of the support magnets 12 shown in FIG. 4 are exemplary. Of course, other magnetization directions can be specified.
• the stationary support magnet 12 can be located on the same surface 14. 1 of the printed circuit board 14 as the sensitive one Measuring element 16.1 as well as on another surface 14.2 of the circuit board 14 are arranged. Also in this embodiment, by selecting the position of the at least one support magnet 12 to the sensitive measuring element 16.1 and the magnetization direction of the at least one support magnet 12, the angle of the fixed magnetic field vector with respect to the normal of the measuring surface of the sensitive measuring element 16.1 at the location of the sensitive measuring element 16.1 be easily specified. In Fig. 5 and 6 different possible positions for the arrangement of the dashed lines drawn at least one support magnet 12 are shown. As already stated above, any magnetization directions for the at least one
• Support magnets 12 and the at least one useful magnet 18 are predetermined, wherein the magnetization directions of the support magnets 12 and the useful magnet 18 shown in FIGS. 5 and 6 are only examples.
• the movable at least one useful magnet 18 ensures the rotation of the magnetic field vector at the location of the fixed sensitive measuring element 16.1 and thus for the signal change in the measuring range A of the sensitive measuring element 16.1.
• the fixed at least one support magnet 18 provides for a fixed non-rotating magnetic field vector and a sufficient flux density as soon as the at least one useful magnet 18 has moved too far away from the location of the fixed sensitive measuring element 16.1.
• the constant magnetic field vector is used to generate a constant output signal in the fixed clamping area.
• the at least one support magnet 12 is advantageously oriented such that its magnetization direction at the moment when the useful magnet 18 leaves the measuring range A of the sensitive measuring element 16.1 retains the last-measured magnetic field direction, ie provides a constant measuring angle, which in the course of the previous measurement up to leaving the measuring range A of the sensitive measuring element 16.1 was not previously measured.
• the path R to be detected corresponds to a translational movement of the moving component 3.
• embodiments of the sensor arrangement 1 according to the invention for path detection on a moving component 5 can also be used to detect a rotational movement.

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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)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2014
  • 2014-03-26 DE DE102014205566.0A patent/DE102014205566A1/de active Pending
• 2015
  • 2015-02-25 WO PCT/EP2015/053902 patent/WO2015144377A1/de active Application Filing
  • 2015-02-25 US US15/128,791 patent/US9927260B2/en active Active
  • 2015-02-25 CN CN201580016350.XA patent/CN106164621B/zh not_active Expired - Fee Related
  • 2015-02-25 JP JP2016559254A patent/JP6534682B2/ja not_active Expired - Fee Related
  • 2015-02-25 EP EP15708771.9A patent/EP3123117A1/de not_active Ceased

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