WO2015079625A1 - Détecteur d'amplitude de mouvement et système de pédale de frein utilisant le détecteur d'amplitude de mouvement - Google Patents

Détecteur d'amplitude de mouvement et système de pédale de frein utilisant le détecteur d'amplitude de mouvement Download PDF

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Publication number
WO2015079625A1
WO2015079625A1 PCT/JP2014/005554 JP2014005554W WO2015079625A1 WO 2015079625 A1 WO2015079625 A1 WO 2015079625A1 JP 2014005554 W JP2014005554 W JP 2014005554W WO 2015079625 A1 WO2015079625 A1 WO 2015079625A1
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WIPO (PCT)
Prior art keywords
magnetic
magnetic body
magnet
movement amount
sensing element
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PCT/JP2014/005554
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English (en)
Japanese (ja)
Inventor
巧 大林
野添　利幸
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パナソニックＩｐマネジメント株式会社
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Publication of WO2015079625A1 publication Critical patent/WO2015079625A1/fr

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    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
    • G05G1/30—Controlling members actuated by foot
    • G05G1/38—Controlling members actuated by foot comprising means to continuously detect pedal position

Definitions

  • This technical field relates to a movement amount detector used for various vehicles and a brake pedal system using the movement amount detector.
  • FIG. 9 is a perspective view of a conventional movement amount detector
  • FIG. 10 is a side view of the conventional movement amount detector
  • FIG. 11 is a position of a magnet in the conventional movement amount detector and a magnetic flux density passing through a magnetosensitive element.
  • the movement amount detector 1 includes an annular magnet 2 and a magnetosensitive element 3.
  • the annular magnet 2 can move in the axial direction (Z direction) passing through the center of the annular magnet 2.
  • the magnetosensitive element 3 is arranged at a position parallel to the Z direction so that the magnetic lines of force emitted from the annular magnet 2 pass through.
  • the annular magnet 2 is configured by disposing a first magnet surface 2N having N polarity and a second magnet surface 2S having S polarity on opposite surfaces.
  • a Hall element or the like is used as the magnetosensitive element 3. Then, as shown in FIG. 10, when the annular magnet 2 moves in the Z-axis direction, the position of the magnetic lines 4 generated by the annular magnet 2 moves.
  • the passage angle when the above-mentioned magnetic field lines 4 pass through the magnetosensitive element 3 changes. That is, as the positional relationship between the annular magnet 2 and the magnetic sensing element 3 changes, the passing angle of the magnetic force lines 4 with respect to the magnetic sensing element 3 changes.
  • the movement detector 1 is based on the positional relationship between the annular magnet 2 and the magnetic sensing element 3 based on the output signal of the magnetic sensing element 3 that changes according to the angle at which the magnetic force lines 4 pass to the magnetic sensing element 3. (See, for example, Patent Document 1).
  • the movement amount detector in the present disclosure includes a magnet and a magnetic sensing part.
  • the magnet has an N pole on the first surface, an S pole on the second surface opposite to the first surface, and is movable along an axis orthogonal to the first surface and the second surface.
  • the magnetic sensing unit includes a first magnetic body, a magnetic sensing element, and a second magnetic body that are sequentially arranged in a first direction parallel to the axis, and a processing circuit unit that is electrically connected to the magnetic sensing element. Have.
  • Each of the first magnetic body and the second magnetic body has a first end portion and a second end portion farther from the magnetosensitive element than the first end portion.
  • the length in the second direction perpendicular to the first direction at the first end is shorter than the length in the second direction at the second end.
  • the magnetosensitive element outputs an electrical signal corresponding to the angle at which the magnetic lines of force generated from the magnet pass through the magnetosensitive element.
  • the processing circuit unit detects the amount of movement of the magnet based on an electrical signal that changes as the magnet moves.
  • This configuration allows the magnetic sensing unit to detect the position and amount of movement of the magnet accurately and over a wide range without increasing the size and weight of the magnet and the amount of movement detector.
  • FIG. 1 is a schematic perspective view of a movement amount detector in the embodiment.
  • FIG. 2 is a side view of the movement amount detector shown in FIG.
  • FIG. 3 is a relationship diagram between the position of the magnet and the magnetic flux density of the magnetic lines of force passing through the magnetosensitive element in the movement amount detector shown in FIG.
  • FIG. 4 is a top view of the movement amount detector shown in FIG.
  • FIG. 5 is a top view of another movement amount detector in the embodiment.
  • FIG. 6 is a side view of the movement amount detector shown in FIG.
  • FIG. 7 is a schematic diagram of a brake pedal system using the movement amount detector in the embodiment.
  • FIG. 8 is a schematic diagram of a vehicle equipped with the brake pedal system in the embodiment.
  • FIG. 9 is a schematic perspective view of a conventional movement amount detector.
  • FIG. 10 is a side view of the movement amount detector shown in FIG.
  • FIG. 11 is a diagram showing the relationship between the magnet position and the magnetic flux density of the lines of magnetic force passing through
  • the movement amount detector 1 detects the positional relationship between the annular magnet 2 and the magnetosensitive element 3. The detection of this positional relationship is based on the output signal of the magnetosensitive element 3 that changes according to the angle at which the magnetic force lines 4 emitted from the annular magnet 2 pass through the magnetosensitive element 3.
  • the annular magnet 2 is biased to the left or right, and passes through the magnetosensitive element 3 when the distance separating the annular magnet 2 and the magnetosensitive element 3 increases.
  • the magnetic flux density falls below a lower limit value at a certain position as a boundary.
  • the magnetic sensitive element 3 outputs a signal according to the passing angle of the magnetic force lines 4, the magnetic flux density of the magnetic force lines 4 is required to be a predetermined value or more. Therefore, when the distance separating the annular magnet 2 and the magnetic sensing element 3 approaches the limit, the accuracy of detecting the passing angle of the magnetic force lines 4 with respect to the magnetic sensing element 3 and the positional relationship detection by the magnetic sensing element 3 based on this are detected. Accuracy is reduced. In order to cope with this, an annular magnet 2 having a large magnetic force is used, but for that purpose, an annular magnet 2 having a large size is required, so that the movement amount detector 1 is increased in size and weight. .
  • FIG. 1 is a schematic perspective view of a movement amount detector 5 in the present embodiment
  • FIG. 2 is a side view of the movement amount detector 5
  • FIG. 3 is a position of a magnet in the movement amount detector 5 and a magnetic force line passing through a magnetosensitive element. It is a related figure with the magnetic flux density.
  • the movement amount detector 5 includes a magnet 8, a magnetosensitive element 9 having a magnetosensitive element 11, a first magnetic body 12, a second magnetic body 13, and a processing circuit section 14.
  • the magnet 8 has an N pole on the first surface 8N and an S pole on the second surface 8S opposite to the first surface 8N. And it is movable along the axis
  • the first magnetic body 12, the magnetic sensing element 11, and the second magnetic body 13 are sequentially disposed in a first direction (Z direction) parallel to the axis 10.
  • the processing circuit unit 14 is electrically connected to the magnetosensitive element 11.
  • the first magnetic body 12 and the second magnetic body 13 have first end portions 12C and 13C and second end portions 12D and 13D, respectively.
  • the second ends 12D and 13D are farther from the magnetic sensing element 11 than the first ends 12C and 13C.
  • the length in the second direction (Y direction) orthogonal to the Z direction at the first ends 12C and 13C is shorter than the length in the second direction (Y direction) at the second ends 12D and 13D. That is, the width dimension at the first end portions 12C and 13C is smaller than the width dimension at the second end portions 12D and 13D.
  • the magnetosensitive element 11 outputs an electrical signal corresponding to the angle at which the magnetic lines of force generated from the magnet 8 pass through the magnetosensitive element 11. Then, the processing circuit unit 14 detects the amount of movement of the magnet 8 based on an electrical signal that changes as the magnet 8 moves.
  • the movement amount detector 5 can accurately detect the position and the movement amount of the magnet 8 over a wide range without increasing the size of the magnet 8 or increasing the weight of the magnet 8.
  • the magnet 8 faces either the plate-like first magnetic body 12, the magnetosensitive element 11, or the plate-like second magnetic body 13 in the X direction via a space. Is located. Alternatively, the magnet 8 is positioned facing both the first magnetic body 12 and the magnetic sensing element 11 or both the magnetic sensing element 11 and the second magnetic body 13 in the X direction through a space. Yes.
  • the magnet 8 when the magnet 8 is positioned on the shaft 10 so as to face the first magnetic body 12 and is spaced apart from the second magnetic body 13, that is, the magnet 8 is the first magnetic body 12.
  • the magnetic lines of force generated by the magnet 8 mainly pass through the first magnetic body 12 and the magnetic sensing element 11 when positioned near and far from the second magnetic body 13.
  • the magnet 8 when the magnet 8 is located facing the second magnetic body 13 and is located at a distance from the first magnetic body 12, that is, the magnet 8 is close to the second magnetic body 13,
  • the magnetic lines of force generated by the magnet 8 When positioned far from the magnetic body 12, the magnetic lines of force generated by the magnet 8 mainly pass through the second magnetic body 13 and the magnetosensitive element 11.
  • first end 12C of the first magnetic body 12 close to the magnetic sensing element 11 and the second end 12D farther from the first end 12C with respect to the magnetic sensing element 11 are orthogonal to the axis 10.
  • the width dimension of the first end 12C is smaller than the width dimension of the second end 12D.
  • the magnet 8 when the magnet 8 is positioned facing the second end 12D of the first magnetic body 12 or the vicinity of the second end 12D, a large amount of magnetic flux flows through the second end 12D.
  • the position of the magnet 8 corresponds to a region farthest from the magnetic sensing element 11 in the movable range of the magnet 8.
  • the magnetic flux which flowed into the 2nd end part 12D substantially passes through the 1st end part 12C with a small cross-sectional area compared with 2nd end part 12D as it is. For this reason, the magnetic flux density of the first end portion 12C increases as the cross-sectional area decreases.
  • the magnetic sensing part 9 can detect the position of the magnet 8 in a wide range.
  • the first magnetic body 12 enables position detection with respect to the magnet 8 in a wide range, while the influence of the second magnetic body 13 on the direction and angle of the lines of magnetic force passing through the magnetosensitive element 11 is small. .
  • the magnetic sensitive part 9 can detect the position of the magnet 8 in a wide range and with high accuracy. That is, when the magnet 8 is separated from the magnetosensitive element 11 by a large distance and is positioned opposite to the first magnetic body 12, the magnet 8 is emitted from the magnet 8 and senses with the second magnetic body 13. There are very few lines of magnetic force passing through the magnetic element 11. For this reason, the lines of magnetic force that pass through the magnetosensitive element 11 are generally limited to the lines of magnetic force that pass through the first magnetic body 12 without passing through the second magnetic body 13.
  • the magnetosensitive element 11 converts the angle of the lines of magnetic force passing through the magnetosensitive element 11 with high accuracy into an electrical signal, and the magnetosensitive portion 9 detects the position of the magnet 8 in a wide range and with high accuracy. Can do.
  • the magnet 8 when the magnet 8 is positioned facing the second end 13D of the second magnetic body 13 or the vicinity of the second end 13D, a large amount of magnetic flux flows through the second end 13D.
  • the position of the magnet 8 corresponds to a region farthest from the magnetic sensing element 11 in the movable range of the magnet 8.
  • the magnetic flux that has generally flowed through the second end portion 13D passes through the first end portion 13C having a smaller cross-sectional area than the second end portion 13D. For this reason, the magnetic flux density of the first end portion 13C increases as the cross-sectional area of the passage region decreases.
  • the magnetic sensing unit 9 can detect the position of the magnet 8 in a wide range.
  • the influence of the first magnetic body 12 on the direction and angle of the magnetic lines of force passing through the magnetosensitive element 11 is small. Thereby, the magnetic sensitive part 9 can detect the position of the magnet 8 in a wide range and with high accuracy.
  • the plate-like first magnetic body 12 has a substantially uniform thickness. Then, the magnetic flux density is increased by the difference in cross-sectional area based on the difference in width dimension between the first end portion 12C and the second end portion 12D.
  • the first magnetic body 12 may be a plate having a non-uniform thickness, and a difference may be provided in the cross-sectional area between the first end 12C and the second end 12D.
  • the characteristic of the magnetic flux density of the magnetic field lines passing through the magnetosensitive element 11 is shown as a curve A in FIG.
  • shaft 10 is the area
  • the detection limit magnetic flux density of the magnetosensitive element 11 is shown as DL.
  • Curve B shows the change in magnetic flux density that passes through the magnetosensitive element 11 when the magnet 8 moves along the axis 10 when the first magnetic body 12 and the second magnetic body 13 are not provided. It is a characteristic to show. Then, when the magnet 8 moves along the axis 10, transition regions when the magnetosensitive element 11 moves from a region where the magnetic flux density can be detected to a region where the magnetic flux density cannot be detected are a region B and a region B ′.
  • the magnetic sensing unit 9 can change the position or movement amount of the magnet 8 in a wide range by providing the first magnetic body 12 and the second magnetic body 13. Can be detected. This is apparent by comparing curve A and curve B.
  • the center line 8C of the magnet 8 shown in FIG. 2 is located at the second end 12D which is the end of the first magnetic body 12 at a position far away from the magnetic sensing element 11. This is a matching area.
  • the region A ′ is in the vicinity of a position where the center line 8C of the magnet 8 substantially coincides with the second end portion 13D of the second magnetic body 13. Therefore, the movable range of the magnet 8 substantially corresponds to R, which is the distance between the second end 12D of the first magnetic body 12 and the second end 13D of the second magnetic body 13.
  • the movable range of the magnet 8 corresponds to a range in which the magnetic flux density passing through the magnetosensitive element 11 exceeds DL.
  • yokes 8 ⁇ / b> D having the same cross-sectional shape as the magnet 8 (here, annular) may be provided on both surfaces of the magnet 8.
  • the magnetic sensing element 11 emits an electric signal corresponding to the direction and angle in which the magnetic lines generated by the magnet 8 pass through the magnetic sensing element 11. This electrical signal is transmitted from the magnetic sensing element 11 to the processing circuit unit 14 of the magnetic sensing unit 9.
  • the processing circuit unit 14 may store the relationship between the position of the magnet 8 and the electrical signal transmitted from the magnetosensitive element 11 as data in advance. Based on this data, the processing circuit unit 14 detects the position of the magnet 8 using an electrical signal transmitted from the magnetosensitive element 11. Furthermore, the movement amount of the magnet 8 may be detected by performing position detection by the processing circuit unit 14 a plurality of times.
  • the magnetosensitive element 11 and the processing circuit unit 14 are always operable. When an electrical signal is transmitted from the magnetosensitive element 11 to the processing circuit unit 14, the electrical signal is always compared and calculated by the processing circuit unit 14.
  • the magnet 8 can detect the position of the magnet 8 and the amount of movement based on the magnet 8 accurately and over a wide range without increasing the size and weight of the magnet 8.
  • the substrate-like processing circuit unit 14 the magnetic sensing element 11 placed on the processing circuit unit 14, the first magnetic body 12, and the second magnetic body 13 are integrated. Is made up of.
  • the processing circuit unit 14 may be provided separately from the magnetosensitive element 11, the first magnetic body 12, and the second magnetic body 13 arranged on the surface in a row. .
  • the processing circuit unit 14 is only required to be electrically connected to the magnetic sensitive element 11, receive an electric signal emitted from the magnetic sensitive element 11, and perform processing such as calculation on the electric signal.
  • the magnetic field lines have a high magnetic flux density and a first value. It passes through the magnetic sensing element 11 through the magnetic body 12 or the second magnetic body 13. Therefore, the position of the magnet 8 in the movement amount detector 5 and the detection range for the movement amount change according to the distance between both ends on the far side in the Z direction of the first magnetic body 12 and the second magnetic body 13. That is, the movable range of the magnet 8 changes according to the distance between the second end 12D and the second end 13D.
  • the width dimension at the first end portions 12C and 13C is smaller than the width dimension at the second end portions 12D and 13D. More specifically, the first magnetic body 12 and the second magnetic body 13 include narrow portions 12B and 13B having first ends 12C and 13C, and wide portions having second ends 12D and 13D. 12A and 13A may be provided.
  • FIG. 4 is a top view of the movement amount detector 5.
  • the narrow portions 12B and 13B may be rectangular or rectangular.
  • the narrow portions 12B and 13B are Y-direction dimensions perpendicular to the axis 10 and the first width dimensions M1 which are width dimensions at the first end portions 12C and 13C, and the Z-direction dimensions parallel to the axis 10. And a first length dimension M2.
  • the wide portions 12A and 13A may be rectangular or rectangular.
  • the wide portions 12A and 13A have a second width dimension M3 which is a dimension in the Y direction and is a width dimension in the second end portions 12D and 13D, and a second length dimension M4 which is a dimension in the Z direction.
  • the first width dimension M1 may be smaller than the second width dimension M3, and the first length dimension M2 may be smaller than the second length dimension M4.
  • the narrow portions 12B and 13B having a large magnetic resistance are compared with the wide portions 12A and 13A having a small magnetic resistance. And it exists as a short section. That is, the narrow portions 12 ⁇ / b> B and 13 ⁇ / b> B having a large magnetic loss exist only in regions limited in the first magnetic body 12 and the second magnetic body 13. Therefore, the loss of the magnetic lines of force that pass from the first magnetic body 12 and the second magnetic body 13 to the magnetosensitive element 11 is reduced. As a result, the magnet 8 can detect the position of the magnet 8 and the amount of movement based thereon accurately and over a wide range without increasing the size and weight of the magnet 8.
  • the dimension S1 in the Y direction of the magnetosensitive element 11 is preferably smaller than the first width dimension M1 which is the width dimension at the first end portions 12C and 13C.
  • the magnetosensitive element 11 is shown in a rectangular shape, it is actually arranged in a singular or plural manner.
  • the magnetic sensitive element 11 is disposed in a region where the first end portion 12C and the first end portion 13C face each other when viewed from above.
  • the magnetic flux density of the magnetic field lines passing through the magnetosensitive element 11 through either the first end 12C or 13C is less varied depending on the position where the magnetosensitive element 11 is disposed.
  • the magnetic sensing unit 9 can accurately detect the position of the magnet 8 and the amount of movement based thereon without being affected by the change in the position where the magnetic sensing element 11 is arranged.
  • the second width dimension M3 of the wide portions 12A and 13A of the first magnetic body 12 and the second magnetic body 13 is the width direction of the magnet 8 when the magnet 8 is projected in the direction of the magnetic sensitive portion 9.
  • the dimension Y1 may be substantially the same.
  • FIG. 5 is a top view of another movement amount detector in the present embodiment.
  • the width dimension of the first ends 12C and 13C corresponding to the trapezoidal short side is the first width dimension M1
  • the width dimension of the wide parts 12A and 13A corresponding to the trapezoidal long side is the second width dimension M3. is there.
  • first magnetic body 12 and the second magnetic body 13 may be trapezoidal as a whole.
  • the first magnetic body 12, the second magnetic body 13, and the magnetosensitive element 11 are preferably arranged on the same plane parallel to the axis 10.
  • the first magnetic body 12 or the second magnetic body 13 can efficiently pass the lines of magnetic force to the magnetosensitive element 11. Therefore, the magnetic sensing unit 9 can detect the position and the movement amount of the magnet 8 accurately and over a wide range.
  • the first magnetic body 12 and the second magnetic body 13 are arranged on the same plane parallel to the axis 10, and the magnetosensitive element 11 includes the first magnetic body 12 and the first magnetic body 12. It may be arranged closer to the shaft 10 than the second magnetic body 13.
  • FIG. 6 is a side view of the movement amount detector 5 in the present embodiment. As shown in FIG. 6, the magnetosensitive element 11 may be disposed closer to the shaft 10 than the first magnetic body 12 and the second magnetic body 13.
  • the magnet 8 When the magnet 8 is positioned facing the first magnetic body 12, the magnetic lines of force generated from the magnet 8 can easily pass through the magnetosensitive element 11 and the first magnetic body 12.
  • the magnetic flux density of the magnetic field lines emitted from the magnet 8 and passing through the second magnetic body 13 in the above positional relationship is compared with the magnetic flux density of the magnetic field lines passing through the magnetic sensing element 11 through the first magnetic body 12. , Very small. Therefore, when the magnetosensitive element 11 is disposed closer to the shaft 10 than the first magnetic body 12 and the second magnetic body 13, and the magnet 8 is positioned opposite to the first magnetic body 12, the first The angle at which the magnetic lines of force pass through the magnetic sensing element 11 through the magnetic body 12 is not further affected by the magnetic lines of force that pass through the second magnetic body 13.
  • the relationship between the position of the magnet 8 and the angle of the lines of magnetic force passing through the magnetic sensing element 11 is greater than when the magnetic sensing element 11 is arranged on the same plane as the first magnetic body 12 and the second magnetic body 13. Can maintain linearity. As a result, the magnetosensitive element 11 can detect the position and the amount of movement of the magnet 8 more accurately and over a wide range.
  • the magnetic sensing unit 9 can detect the position and amount of movement of the magnet 8 more accurately and over a wide range.
  • a pedestal portion 11 ⁇ / b> A may be provided between the processing circuit unit 14 and the magnetosensitive element 11.
  • a pedestal 11 ⁇ / b> A that is integrated with the processing circuit unit 14 and protrudes from the processing circuit unit 14 may be provided.
  • the above-described point-like magnetosensitive element 11 may be disposed closer to the shaft 10 than the first magnetic body 12 and the second magnetic body 13.
  • the positional relationship between the magnetic sensing element 11, the first magnetic body 12, and the second magnetic body 13 with respect to the shaft 10 will be described with reference to the side view shown in FIG. 6 based on the top view shown in FIG. ing.
  • the positional relationship between the magnetic sensing element 11 and the first magnetic body 12 and the second magnetic body 13 with respect to the shaft 10 is such that the shape of the first magnetic body 12 and the second magnetic body 13 is a convex shape or a base. Even in the case of a shape, it may be applied.
  • the magnetosensitive element 11 is disposed closer to the shaft 10 than the facing surfaces of the first magnetic body 12 and the second magnetic body 13 facing the magnet 8. As a result, the angle of the lines of magnetic force passing through the magnetic sensing element 11 is further unaffected by the lines of magnetic force passing through the first magnetic body 12.
  • an annular magnet 8 is used as an example.
  • the shape of the magnet 8 is not limited to an annular shape, and may be a block shape, a rod shape, a plate shape, or the like.
  • the magnet 8 has an N pole on the first surface 8N and an S pole on the second surface 8S opposite to the first surface 8N.
  • the magnet 8 should just be a state which can move along the axis
  • the S pole may be disposed on the first surface 8N, and the N pole may be disposed on the second surface 8S.
  • the yoke 8D described above is not limited to an annular shape after having the same shape as the cross-sectional shape of the magnet 8, and may be a lump shape, a rod shape, a plate shape, or the like.
  • the yoke 8D, the first magnetic body 12, and the second magnetic body 13 may be made of a magnetic material such as permalloy, iron, or an iron compound. Further, by using the same material for the yoke 8D, the first magnetic body 12, and the second magnetic body 13, it is easy to match the magnetic characteristics related to temperature, and the characteristics as the movement amount detector 5 are stabilized. .
  • FIG. 7 is a schematic diagram of a brake pedal system 16 using the movement amount detector 5
  • FIG. 8 is a schematic diagram of a vehicle equipped with the brake pedal system 16.
  • the brake pedal system 16 includes a brake pedal 17, an interlocking shaft 18, a magnet 8, and a magnetic sensing part 9.
  • the interlocking shaft 18 When the driver of the vehicle 15 depresses the brake pedal 17, the interlocking shaft 18 is movable from the left to the right in the figure so as to move in a first direction (positive Z direction) parallel to the shaft 10. Yes. Further, when the driver's leg is separated from the brake pedal 17, the interlocking shaft 18 is pushed back by the repulsive force of the spring 22 in the first direction (negative Z direction) from the right to the left in FIG. To do.
  • the annular magnet 8 is disposed on the interlocking shaft 18 in a state of being penetrated by the interlocking shaft 18, and the magnet 8 moves in the first direction together with the interlocking shaft 18.
  • the first surface 8N perpendicular to the first direction of the magnet 8 has an N pole
  • the second surface 8S opposite to the first surface 8N has an S pole.
  • the first magnetic body 12, the magnetic sensing element 11, and the second magnetic body 13 are sequentially arranged in a direction parallel to the first direction.
  • the magnetic sensitive part 9 has a processing circuit part 14 electrically connected to the magnetic sensitive element 11.
  • the magnetosensitive element 11 outputs an electrical signal corresponding to the angle at which the magnetic lines of force generated from the magnet 8 pass through the magnetosensitive element 11. Then, the processing circuit unit 14 detects a state such as a position of the brake pedal 17 based on an electric signal that changes as the magnet 8 moves.
  • the magnetic lines of force generated from the magnet 8 pass through the magnetosensitive element 11 with a high magnetic flux density by using the first magnetic body 12 and the second magnetic body 13.
  • the magnetic sensing unit 9 can detect the position and movement amount of the magnet 8 accurately and over a wide range. That is, the brake pedal system 16 can accurately detect the operation state of the brake pedal 17 by the driver in a wide range without increasing the size and weight.
  • an electrical signal corresponding to the direction and angle of the lines of magnetic force passing through the magnetosensitive element 11 is transmitted from the magnetosensitive element 11 to the processing circuit unit 14.
  • the processing circuit unit 14 stores in advance the relationship between the position of the magnet 8 and the voltage transmitted from the magnetosensitive element 11 as data.
  • the magnetic sensing unit 9 may detect the position of the brake pedal 17 based on the electrical signal emitted from the magnetic sensing element 11 using the processing circuit unit 14.
  • the position of the brake pedal 17 may be detected based on the degree of change in the electrical signal based on a plurality of electrical signals emitted from the magnetosensitive element 11.
  • the position detection with respect to the brake pedal 17 by the magnetic sensing unit 9 using the processing circuit unit 14 may be performed a plurality of times. Thereby, the movement amount of the brake pedal 17 is detected.
  • the position detection over a plurality of times may be performed at short intervals such as 1/10 second intervals or 1/100 second intervals.
  • the magnetic sensing unit 9 transmits information on the position and amount of movement related to the operation of the brake pedal 17 by the driver's operation to the vehicle control device 28 shown in FIG.
  • the vehicle control device 28 may operate an idling stop system for starting or stopping the engine 27 based on this information.
  • the vehicle control device 28 may operate the regenerative energy system based on information about the position and amount of movement related to depression of the brake pedal 17 by the driver's operation.
  • the moving amount detector can detect a large moving amount without increasing the size of the magnet or increasing the weight of the magnet. Therefore, it is effective as a movement amount detector used for various vehicles.

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  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne un détecteur d'amplitude de mouvement qui comprend un aimant et une unité de détection magnétique. L'aimant comprend une première surface ayant un pôle nord et une seconde surface ayant un pôle sud, et peut se déplacer le long d'un axe qui est orthogonal à ces surfaces. L'unité de détection magnétique possède un premier corps magnétique, un élément de détection magnétique et un second corps magnétique disposés, dans cet ordre, de façon à être parallèles à l'axe au-dessus. L'unité de détection magnétique possède également une unité de circuit de traitement, qui est reliée électriquement à l'élément de détection magnétique. Le premier corps magnétique et le second corps magnétique présentent chacun une première partie d'extrémité et une seconde partie d'extrémité qui plus est éloignée de l'élément de détection magnétique que la première partie d'extrémité et plus large que la première partie d'extrémité. L'élément de détection magnétique émet un signal électrique correspondant à l'angle auquel les lignes de force magnétique émises par l'aimant passent à travers l'élément de détection magnétique. L'unité de circuit de traitement détecte l'amplitude de mouvement de l'aimant sur la base du signal électrique.
PCT/JP2014/005554 2013-11-26 2014-11-05 Détecteur d'amplitude de mouvement et système de pédale de frein utilisant le détecteur d'amplitude de mouvement WO2015079625A1 (fr)

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US201361908751P 2013-11-26 2013-11-26
US61/908,751 2013-11-26

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005181136A (ja) * 2003-12-19 2005-07-07 Taiyo Ltd 検知スイッチ、検知装置およびシリンダ装置
WO2008081533A1 (fr) * 2006-12-28 2008-07-10 Mitsubishi Electric Corporation Détecteur de position magnétique
JP2009258091A (ja) * 2008-03-19 2009-11-05 Mitsubishi Electric Corp 磁気式位置センサ
JP2011096487A (ja) * 2009-10-29 2011-05-12 Panasonic Corp 車両用スイッチ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005181136A (ja) * 2003-12-19 2005-07-07 Taiyo Ltd 検知スイッチ、検知装置およびシリンダ装置
WO2008081533A1 (fr) * 2006-12-28 2008-07-10 Mitsubishi Electric Corporation Détecteur de position magnétique
JP2009258091A (ja) * 2008-03-19 2009-11-05 Mitsubishi Electric Corp 磁気式位置センサ
JP2011096487A (ja) * 2009-10-29 2011-05-12 Panasonic Corp 車両用スイッチ

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