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JP-7857249-B2 - Detection device

JP7857249B2JP 7857249 B2JP7857249 B2JP 7857249B2JP-7857249-B2

Inventors

  • 木田 喜啓
  • 赤間 貞洋
  • 堀畑 晴美
  • 半田 晶寛

Assignees

  • 株式会社SOKEN
  • 株式会社デンソー

Dates

Publication Date
20260512
Application Date
20230405

Claims (17)

  1. In a detection device applied to a machine equipped with a rotating body (10), A bearing (50) rotatably supports the rotating body with respect to the base portion (42) of the machine, The detection target portion (82, 83, 182, 183, 282, 283) extends in the circumferential direction of the bearing and forms an annular shape centered on the bearing, A planar receiving coil (110, 120, 130, 150, 160, 111, 112, 121, 122, 110A, 120A, 130A, 110B, 120B, 130B) is fixed to the base portion and positioned opposite the detection target portion in the axial direction of the bearing, and extends in the radial direction of the bearing, Excitation coils (100, 100A, 100B) to which AC excitation voltage is supplied, Equipped with, The detection target unit is provided to rotate in conjunction with the rotation of the rotating body. The receiving coil is The outer coils (110, 111, 112, 110A, 110B) from which a voltage is induced when the excitation voltage is supplied to the excitation coil, When the excitation voltage is supplied to the excitation coil, the inner coils (120, 121, 122, 120A, 120B) induce a voltage that is in phase with the induced voltage of the outer coil, Includes, The outer coil is positioned at a location that is shifted radially outward from the inner coil. In a plan view of the outer coil and the inner coil, one radial end of the outer coil and one radial end of the inner coil protrude from the radial end of the detection target portion. The outer coil and the inner coil are a detection device that, when the excitation voltage is supplied to the excitation coil, outputs an AC voltage signal having an amplitude corresponding to the displacement of the part to be detected in a direction perpendicular to the axial direction.
  2. In a plan view of the outer coils (110-112) and the inner coils (120-122), the radial outer end of the outer coil extends beyond the radial outer end (84) of the detection target portion. In a plan view of the outer coil and the inner coil, the radial inner end of the outer coil and the radial outer end of the inner coil are located between the radial outer end and the radial inner end (85) of the detection target portion. The detection device according to claim 1, wherein, in a plan view of the outer coil and the inner coil, the radial inner end of the inner coil protrudes from the radial inner end of the part to be detected.
  3. A differential voltage calculation unit (96) calculates a differential voltage (Vssub), which is the difference between the output voltage signal of the outer coil (110) and the output voltage signal of the inner coil (120). A force calculation unit (98) calculates the force (Fz) acting on the rotating body in a direction perpendicular to the axial direction based on the differential voltage calculated by the differential voltage calculation unit, The detection device according to claim 2, comprising:
  4. The detection target portion has a configuration in which recesses (83) that are recessed in the axial direction and protrusions (82) that project from the recesses in the axial direction are alternately provided in the circumferential direction. The receiving coil includes an intermediate coil (130) that, when the excitation voltage is supplied to the excitation coil, induces a voltage that is in a different phase from the voltage induced in the outer coil and the inner coil. In a plan view of the outer coil, the inner coil, and the intermediate coil, the radial outer end and inner end of the intermediate coil are located between the radial outer end and inner end of the detection target portion. The intermediate coil outputs an AC voltage signal having an amplitude corresponding to the displacement of the part to be detected in the axial direction. A combined voltage calculation unit (96) calculates a combined voltage (Vsadd), which is the sum of the output voltage signal of the outer coil and the output voltage signal of the inner coil. An angle calculation unit (97) calculates the rotation angle of the rotating body based on the combined voltage calculated by the combined voltage calculation unit and the output voltage signal of the intermediate coil, A detection device according to any one of claims 1 to 3, comprising:
  5. The outer coils (111, 112) are arranged in a plurality in the circumferential direction, The inner coils (121, 122) are individually provided at positions aligned with the outer coils in the radial direction. The outer coils adjacent to each other in the circumferential direction are arranged such that a portion of them overlaps in a plan view of the outer coils. The detection device according to claim 2, wherein the inner coils adjacent to each other in the circumferential direction are arranged such that a portion of them overlaps in a plan view of the inner coils.
  6. A differential voltage calculation unit (95) selects one set of the radially arranged sets of outer coils and inner coils and calculates a differential voltage which is the difference between the output voltage signal of the outer coil and the output voltage signal of the inner coil that constitute the selected set. A force calculation unit (95) calculates the force (Fz) acting on the rotating body in a direction perpendicular to the axial direction based on the differential voltage calculated by the differential voltage calculation unit, The detection device according to claim 5, comprising:
  7. The detection target unit is, External detection target parts (82o, 83) An inner detection target portion (82i, 83) is provided in the radial direction, which is located inside the outer detection target portion. It has, The outer detection target portion and the inner detection target portion are configured such that recesses (83) that are recessed in the axial direction and protrusions (82o, 82i) that project from the recesses in the axial direction are alternately provided in the circumferential direction. In the detection target portion, an intermediate recess (86) is formed between the outer detection target portion and the inner detection target portion in the radial direction, which is recessed in the axial direction relative to the convex portion and forms an annular shape. The protrusions of the outer detection target portion and the protrusions of the inner detection target portion are aligned in the radial direction. In a plan view of the outer coil and the inner coil, the radial outer end of the outer coil is located between the radial outer end (84) and the inner end (87) of the outer detection target portion. In a plan view of the outer coil and the inner coil, the radial inner end of the outer coil protrudes from the radial inner end of the outer detection target portion. In a plan view of the outer coil and the inner coil, the radial outer end of the inner coil extends beyond the radial outer end (88) of the inner detection target portion. The detection device according to claim 1, wherein, in a plan view of the outer coil and the inner coil, the radial inner end of the inner coil is located between the radial outer end and the radial inner end (85) of the inner detection target portion.
  8. A differential voltage calculation unit (96) calculates a differential voltage (Vssub), which is the difference between the output voltage signal of the outer coil and the output voltage signal of the inner coil. A force calculation unit (98) calculates the force (Fz) acting on the rotating body in a direction perpendicular to the axial direction based on the differential voltage calculated by the differential voltage calculation unit, The detection device according to claim 7, comprising:
  9. The receiving coil is When the excitation voltage is supplied to the excitation coil, a first coil (150) is provided which induces a voltage that is in phase with the voltage induced in the outer coil and the inner coil, When the excitation voltage is supplied to the excitation coil, a second coil (160) is provided which induces a voltage in the same phase as the induced voltage of the first coil, Includes, The first coil is provided on the outer side of the second coil in the radial direction, In a plan view of the outer coil, the inner coil, the first coil, and the second coil, the radial outer end and inner end of the first coil are located between the radial outer end and inner end of the outer detection target portion, and closer to the radial inner end of the outer detection target portion. In a plan view of the outer coil, the inner coil, the first coil, and the second coil, the radial outer end and inner end of the second coil are located between the radial outer end and inner end of the inner detection target portion, and closer to the radial outer end of the inner detection target portion. The first coil outputs an AC voltage signal having an amplitude corresponding to the displacement of the outer detection target in the axial direction. The second coil outputs an AC voltage signal having an amplitude corresponding to the displacement of the inner detection target in the axial direction. A first combined voltage calculation unit (96) calculates a first combined voltage (Vsadd), which is the sum of the output voltage signal of the outer coil and the output voltage signal of the inner coil, A second combined voltage calculation unit (99) calculates a second combined voltage (Vcad), which is the sum of the output voltage signal of the first coil and the output voltage signal of the second coil, An angle calculation unit (97) calculates the rotation angle of the rotating body based on the first combined voltage calculated by the first combined voltage calculation unit and the second combined voltage calculated by the second combined voltage calculation unit, The detection device according to claim 7 or 8, comprising:
  10. The detection device according to any one of claims 1 to 3, 5 to 8, wherein, in a front view of the outer coil and the inner coil, the radially inner portion of the outer coil and the radially outer portion of the inner coil overlap.
  11. The machine is equipped with a motor (20) which serves as the power source for the rotation of the rotating body. The motor has a rotor (30) that includes a magnet unit (32) that forms a plurality of magnetic poles with alternating polarities in the circumferential direction, The detection device according to claim 4, wherein the angle calculation unit calculates the rotation angle of the rotor.
  12. The receiving coil is A first portion (110P, 120P, 130P) that generates a voltage of first polarity across the receiving coil when the excitation voltage is supplied to the excitation coil, When the excitation voltage is supplied to the excitation coil, a second portion (110M, 120M, 130M) generates a voltage with a second polarity opposite to the first polarity at both ends of the receiving coil, It has, The receiving coil is A detection device according to any one of claims 1 to 3, 5 to 8, wherein, in a plan view of the receiving coil, the first portion (110P, 120P) is provided on one side with respect to the circumferential center of the receiving coil and the second portion (110M, 120M) is provided on the other side, and the first portion and the second portion are arranged in the circumferential direction, or, in a plan view of the receiving coil, the first portion (130P) and the second portion (130M) on one side and the first portion and the second portion on the other side are configured to be symmetrical with respect to the center with respect to the circumferential center of the receiving coil.
  13. The detection device according to any one of claims 1 to 3, 5 to 8, wherein the machine is a vehicle equipped with wheels as the rotating body.
  14. The detection device according to claim 13, wherein the bearing is arranged such that the center position (Lb) of the bearing in the vehicle width direction is inward in the vehicle width direction than the center position (Lh) of the wheel constituting the wheel.
  15. A detection device according to claim 14, dependent on claim 3, comprising: an offset amount (Loff) between the center position of the wheel in the vehicle width direction and the center position of the bearing in the vehicle width direction; and a correction unit that corrects the force calculated by the force calculation unit based on the acquired offset amount.
  16. The detection target unit is, The first detection target unit, A second detection target is provided at a position opposite to the first detection target in the axial direction, It has, The first detection target portion and the second detection target portion are configured such that recesses (183, 283) that are recessed in the axial direction and protrusions (182, 282) that project from the recesses in the axial direction are alternately provided in the circumferential direction. The first detection target unit is arranged such that the recess and protrusion of the first detection target unit are directed toward the recess and protrusion of the second detection target unit. The receiving coil is A first intermediate coil (130A) is provided at a position opposite to the first detection target unit, A second intermediate coil (130B) is provided at a position opposite to the second detection target unit, Includes, When the excitation voltage is supplied to the excitation coil, the first intermediate coil and the second intermediate coil are configured such that a voltage in the same phase as the voltage induced in the second intermediate coil is induced in the first intermediate coil. A differential voltage calculation unit (95) calculates a differential voltage (Vcsub), which is the difference between the output voltage signal of the first intermediate coil and the output voltage signal of the second intermediate coil. A force calculation unit (95) calculates the force (Fy) acting on the rotating body in the axial direction based on the differential voltage calculated by the differential voltage calculation unit, The detection device according to claim 1, comprising:
  17. In a detection device applied to a machine equipped with a rotating body (10), A bearing (50) rotatably supports the rotating body with respect to the base portion (42) of the machine, A first detection target portion (182, 183) extends in the circumferential direction of the bearing and forms an annular shape centered on the bearing, The second detection target portion (282, 283) extends in the circumferential direction and forms an annular shape centered on the bearing, The bearing comprises a planar receiving coil (130A, 130B) extending in the radial direction, Excitation coils (100, 100A, 100B) to which AC excitation voltage is supplied, Equipped with, The first detection target unit and the second detection target unit are provided to rotate in conjunction with the rotation of the rotating body. The second detection target unit is provided at a position opposite to the first detection target unit in the axial direction of the bearing , The first detection target portion and the second detection target portion are configured such that recesses (183, 283) that are recessed in the axial direction and protrusions (182, 282) that project from the recesses in the axial direction are alternately provided in the circumferential direction. The first detection target unit is arranged such that the recess and protrusion of the first detection target unit are directed toward the recess and protrusion of the second detection target unit. The receiving coil is A first intermediate coil (130A) is fixed to the base portion and is provided at a position facing the first detection target portion in the axial direction , A second intermediate coil (130B) is fixed to the base portion and is provided at a position facing the second detection target portion in the axial direction , Includes, When the excitation voltage is supplied to the excitation coil, the first intermediate coil and the second intermediate coil are configured such that a voltage in the same phase as the voltage induced in the second intermediate coil is induced in the first intermediate coil. A differential voltage calculation unit (95) calculates a differential voltage (Vcsub), which is the difference between the output voltage signal of the first intermediate coil and the output voltage signal of the second intermediate coil. A force calculation unit (95) calculates the force (Fy) acting on the rotating body in the axial direction based on the differential voltage calculated by the differential voltage calculation unit, A detection device equipped with the following features.

Description

This disclosure relates to a detection device. Conventionally, bearing devices are known that rotatably support a hub fixed to a wheel relative to the vehicle body. The bearing device comprises an outer ring fixed to the vehicle body, an inner ring fixed to the hub, and rolling elements between the outer and inner rings. Here, in order to stabilize the vehicle's movement, it is desirable that the vehicle's movement be controlled based on the forces acting on the wheels. Patent Document 1 describes a configuration for detecting forces acting on a wheel, comprising an axial strain sensor, a radial strain sensor, and a control unit. The axial strain sensor detects the axial displacement of the outer ring, and the radial strain sensor detects the radial displacement of the outer ring. Since there is a correlation between displacement and the force acting on the wheel, the displacement can be converted into force. Therefore, the control unit calculates the axial force of the wheel based on the displacement detected by the axial strain sensor, and calculates the vertical force acting on the wheel based on the displacement detected by the radial strain sensor. Patent No. 5436191 A longitudinal cross-sectional view of the wheel according to the first embodiment.Plan view of the target rotor.Perspective view of the target rotor.A magnified view of the area around the detection unit in the target rotor.Plan view of the detection unit.A diagram showing the electrical configuration of the detection unit.This diagram shows the state in which the inner wheel is tilted relative to the outer wheel when a lateral force is applied to the tire.A diagram showing the vertical displacement of the inner wheel when a vertical load is applied to the tire.Plan view of the outer coil.Plan view of the inner coil.Plan view of the intermediate coil.A diagram showing the positional relationship between each coil and the target rotor in the standard state.A diagram illustrating the principle of detecting displacement and rotation angle.A diagram illustrating the principle of detecting displacement and rotation angle.A simplified plan view of the receiving coil.A diagram showing the output voltage signal of the receiving coil and the changes in the envelope of this signal.This diagram shows the change in the output voltage signal of a coil from its reference state when a lateral force is applied.This figure shows the change in the output voltage signal of a coil from the reference state when a vertical load is applied.This diagram shows the relationship between the radial displacement of the target rotor and the output voltage signal of the coil.A flowchart illustrating the procedure for calculating angle and force in the receiving circuit.A diagram showing the positional relationship between each coil and the protrusions of the target rotor according to the second embodiment.A diagram showing the positional relationship between each coil and the protrusions of the target rotor according to the third embodiment.Plan view of the target rotor.A diagram showing the electrical configuration of the detection unit.A flowchart illustrating the procedure for calculating angle and force in the receiving circuit.A diagram showing the positional relationship between each coil and the protrusions of the target rotor according to the fourth embodiment.A flowchart illustrating the procedure for calculating angle and force in the receiving circuit.A longitudinal cross-sectional view of the wheel according to the fifth embodiment.A flowchart illustrating the procedure for force correction processing in the receiving circuit.A diagram showing each detection unit and target rotor according to the sixth embodiment.Cross-sectional view along line 31-31 in Figure 30.Cross-sectional view along line 32-32 in Figure 30.A diagram showing the electrical configuration of each detection unit.A flowchart illustrating the procedure for calculating angle and force in the receiving circuit.A plan view of a target rotor according to another embodiment. Multiple embodiments will be described with reference to the drawings. In multiple embodiments, functionally and/or structurally corresponding and/or related parts may be given the same reference numeral, or reference numerals that differ by hundreds or more digits. For corresponding and/or related parts, refer to the descriptions of other embodiments. <First Embodiment> Hereinafter, a first embodiment of the detection device relating to this disclosure will be described with reference to the drawings. The vehicle device of this embodiment is configured to calculate the force acting on a wheel (drive wheel) equipped with an in-wheel motor. The vehicle is, for example, a four-wheeled passenger vehicle having two front wheels and two rear wheels. However, the vehicle is not limited to this, and may be a vehicle other than a four-wheeled vehicle, such as a two-wheeled vehicle. Furthermore, the use of the vehicle is not limited