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JP-7855991-B2 - Position detection device

JP7855991B2JP 7855991 B2JP7855991 B2JP 7855991B2JP-7855991-B2

Inventors

  • 河野 司
  • 小林 篤史
  • 村山 亮介
  • 松本 光一郎
  • 杉戸 達明

Assignees

  • 株式会社デンソー

Dates

Publication Date
20260511
Application Date
20221125

Claims (13)

  1. A position detection device, A first target (22, 23) moves back and forth in a predetermined direction of movement (Dc), A second target (24, 25) moves back and forth in the direction of movement together with the first target, The device comprises a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), first receiving coils (34, 36) and second receiving coils (35, 37) through which an induced current flows due to electromagnetic induction caused by energizing the first transmitting coil and outputs detection signals (V1, V2) corresponding to the position of the first target, and a third receiving coil (40, 42) and fourth receiving coil (41, 43) through which an induced current flows due to electromagnetic induction caused by energizing the second transmitting coil and outputs detection signals corresponding to the position of the second target, and a substrate (30) facing the first target and the second target, with the direction intersecting the direction of movement being the normal direction (Da), and positioned on one side of the normal direction with respect to the first target and the second target, The first receiving region (301, 302) occupied by the first receiving coil and the second receiving coil within the substrate, and the second receiving region (303, 304) occupied by the third receiving coil and the fourth receiving coil within the substrate are arranged side by side in the direction of movement. The first target moves back and forth within an operating range (W1a, W1b) such that the first target does not overlap with the other side opposite to the one side in the normal direction relative to the second receiving area . The first target and the second target each constitute a part of a rotating member (16, 18, 20) that rotates about an axis (CL) with the normal direction as the axial direction, The aforementioned direction of movement is the circumferential direction (Dc) of the axis, Two of the first targets are provided, and one of the two first targets (22) is positioned on the opposite side of the axis from the other first target (23). A position detection device is also provided, which includes two receiving coil groups (301a, 302a) configured as a combination of the first receiving coil and the second receiving coil, wherein one of the two receiving coil groups (301a) is positioned on the opposite side of the axis from the other receiving coil group (302a) .
  2. The first receiving coil (34) belonging to one of the receiving coil groups and the first receiving coil (36) belonging to the other receiving coil group are electrically connected. The position detection device according to claim 1 , wherein the second receiving coil (35) belonging to one of the receiving coil groups and the second receiving coil (37) belonging to the other receiving coil group are also electrically connected.
  3. The first receiving coil (34) belonging to one of the receiving coil groups and the first receiving coil (36) belonging to the other receiving coil group are connected in series in a direction that reinforces the induced electromotive forces generated by the electromagnetic induction of the first transmitting coil. The position detection device according to claim 1, wherein the second receiving coil (35) belonging to one of the receiving coil groups and the second receiving coil (37) belonging to the other receiving coil group are connected in series in a direction that reinforces the induced electromotive forces of each other generated by the electromagnetic induction of the first transmitting coil.
  4. A position detection device, A first target member (16) includes a first target (22, 23) that moves back and forth in a predetermined direction of movement (Dc), A second target member (18) includes a second target (24, 25) that moves back and forth in the direction of movement together with the first target, The device comprises a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), first receiving coils (34, 36) and second receiving coils (35, 37) through which an induced current flows due to electromagnetic induction caused by energizing the first transmitting coil and outputs detection signals (V1, V2) corresponding to the position of the first target, and a third receiving coil (40, 42) and fourth receiving coil (41, 43) through which an induced current flows due to electromagnetic induction caused by energizing the second transmitting coil and outputs detection signals corresponding to the position of the second target, and a substrate (30) facing the first target and the second target, with the direction intersecting the direction of movement being the normal direction (Da), and positioned on one side of the normal direction with respect to the first target and the second target, The first receiving region (301, 302) occupied by the first receiving coil and the second receiving coil within the substrate, and the second receiving region (303, 304) occupied by the third receiving coil and the fourth receiving coil within the substrate are arranged side by side in the direction of movement. The first target moves back and forth within an operating range (W1a, W1b) such that the first target does not overlap with the other side opposite to the one side in the normal direction relative to the second receiving area . The first target member is connected to the object to be detected (70) without the second target member so that it cannot be displaced relative to the object in the direction of movement. A position detection device in which the second target member is connected to the object to be detected without the first target member, such that it cannot be displaced relative to the object in the direction of movement.
  5. A position detection device, A first target (22, 23) moves back and forth in a predetermined direction of movement (Dc), A second target (24, 25) moves back and forth in the direction of movement together with the first target, The device comprises a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), first receiving coils (34, 36) and second receiving coils (35, 37) through which an induced current flows due to electromagnetic induction caused by energizing the first transmitting coil and outputs detection signals (V1, V2) corresponding to the position of the first target, and a third receiving coil (40, 42) and fourth receiving coil (41, 43) through which an induced current flows due to electromagnetic induction caused by energizing the second transmitting coil and outputs detection signals corresponding to the position of the second target, and a substrate (30) facing the first target and the second target, with the direction intersecting the direction of movement being the normal direction (Da), and positioned on one side of the normal direction with respect to the first target and the second target, The first receiving region (301, 302) occupied by the first receiving coil and the second receiving coil within the substrate, and the second receiving region (303, 304) occupied by the third receiving coil and the fourth receiving coil within the substrate are arranged side by side in the direction of movement. The first target moves back and forth within an operating range (W1a, W1b) such that the first target does not overlap with the other side opposite to the one side in the normal direction relative to the second receiving area . Furthermore, the position detection device is A first insertion hole (161a) into which a detected object (70) that rotates about an axis (CL) with the normal direction as the axial direction is inserted, and first insertion grooves (161b, 161c) connected to the first insertion hole are formed, and a first target member (16) including the first target, The second target member (18) includes a second insertion hole (181a) into which the object to be detected is inserted, and second insertion grooves (181b, 181c) connected to the second insertion hole, and the second target member (18) includes the second target. The aforementioned direction of movement is the circumferential direction (Dc) of the axis, The first insertion hole and the second insertion hole are arranged so as to be connected to each other in the axial direction. The first and second insertion grooves are also arranged so as to be connected to each other in the axial direction. A position detection device in which protrusions (702b, 702c) provided on the object to be detected and extending outward in the radial direction (Dr) of the axis are fitted into the first and second fitting grooves .
  6. The first target has opposing surfaces (22a, 23a) formed on one side in the normal direction and facing the substrate, The second target also has opposing surfaces (24a, 25a) formed on one side in the normal direction and facing the substrate, The first target member has a first connecting portion (161) that connects to the object to be detected, The second target member has a second connecting portion (181) which is arranged on one side in the normal direction to the first connecting portion and connected to the object to be detected, The position detection device according to claim 4 or 5, wherein the opposing surface of the first target is provided on one side in the normal direction of the first connecting portion, so that the distance (AG) between the opposing surface of the first target and the substrate and the distance (AG) between the opposing surface of the second target and the substrate in the normal direction are aligned with each other.
  7. The position detection device according to any one of claims 1 to 5 , wherein the operating range of the first target is a range distributed in the direction of movement with respect to the central position (301b, 302b) of the first receiving area in the direction of movement.
  8. The position detection device according to any one of claims 1 to 5, wherein the first target moves back and forth without extending beyond the range on the other side of one end position (P1) of the first receiving area and on the one side of the other end position (P2) of the first receiving area in the direction of movement.
  9. The position detection device according to any one of claims 1 to 5, wherein, in a view along the normal direction of the substrate, the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil are arranged inside the first transmitting coil and inside the second transmitting coil.
  10. The position detection device according to any one of claims 1 to 5, wherein, in a view along the normal direction of the substrate, the first receiving coil and the second receiving coil are arranged inside the first transmitting coil and outside the second transmitting coil, and the third receiving coil and the fourth receiving coil are arranged inside the second transmitting coil and outside the first transmitting coil.
  11. The position detection device according to any one of claims 1 to 5, wherein the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of spiral portions (34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b) that form a spiral pattern shape when viewed in a direction along the normal direction of the substrate.
  12. The position detection device according to any one of claims 1 to 5, wherein the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of wavy portions (34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, 43e) that form a pattern shape that draws a sinusoidal curve when viewed in the direction along the normal direction of the substrate.
  13. The system includes fault detection units (473, 483) that detect a fault based on a value (Vx) obtained from "V1 2 + V2 2 ", where V1 is the magnitude of the detection signal output by the first receiving coil and V2 is the magnitude of the detection signal output by the second receiving coil. The detection signal of the first receiving coil changes sinusoidally with respect to the electrical angle (θ) corresponding to the position of the first target, The position detection device according to any one of claims 1 to 5 , wherein the detection signal of the second receiving coil changes in a cosine wave manner with respect to the electrical angle.

Description

This invention relates to a position detection device. As a type of position detection device, for example, the angular position sensor described in Patent Document 1 has been conventionally known. This angular position sensor described in Patent Document 1 uses electromagnetic induction to detect the rotational position of an object rotating around its axis. To this end, the angular position sensor in Patent Document 1 comprises two sets of coil combinations, each consisting of a transmitting coil that generates an alternating magnetic field and two receiving coils positioned inside the transmitting coil. U.S. Patent Application Publication No. 2022/0136869 This is a schematic diagram showing the position detection device in the first embodiment as viewed along the axis direction of the member, illustrating the general configuration of the position detection device.This is a cross-sectional view showing the section II-II in Figure 1, which is a longitudinal cross-sectional view of the position detection device.This is a cross-sectional view showing the section III-III in Figure 1, and is a longitudinal cross-sectional view showing the position detection device in a different orientation than that of Figure 2.This is a plan view showing the rotating member of the position detection device as a single unit in the first embodiment.In the first embodiment, the circuit board of the position detection device is shown as a standalone unit, and the individual coils within that circuit board are schematically shown.This is a view in the direction of arrow VI in Figure 5, schematically showing each transmitting coil within the substrate.This diagram corresponds to Figure 5, and is a schematic diagram in which the receiving coil shown in Figure 5 is replaced with the receiving region formed by that receiving coil.This is a block diagram of the position detection device in the first embodiment.This figure illustrates the waveforms of the first voltage value output from the first receiving coil and the waveform of the second voltage value output from the second receiving coil, respectively, in the first embodiment.In the second embodiment, this figure shows the substrate of the position detection device as a standalone unit, and schematically illustrates each coil within the substrate, and corresponds to Figure 5.In the third embodiment, this figure shows the substrate of the position detection device as a standalone unit, and schematically illustrates each coil within the substrate, and corresponds to Figure 5.In the fourth embodiment, this figure shows the substrate of the position detection device as a standalone unit, and schematically illustrates each coil within the substrate, and corresponds to Figure 5.This is a block diagram of the position detection device in the fifth embodiment, and corresponds to Figure 8.This is a flowchart showing the control process executed by the first fault detection unit in the fifth embodiment.This figure shows the relationship between the first sensor output and the second sensor output, respectively, and the rotation angle of the rotating member in the first comparative example, which is compared with the fifth embodiment.This is a schematic diagram showing the position detection device in the sixth embodiment in a view along the axis direction of the member, illustrating the general configuration of the position detection device, and corresponds to Figure 1.This is a cross-sectional view showing the section between XVII and XVII in Figure 16, and corresponds to Figure 2.Figure 16 is a cross-sectional view showing the XVIII-XVIII section, and corresponds to Figure 3. The embodiments will be described below with reference to the drawings. In the following embodiments, parts that are identical or equivalent to each other are denoted by the same reference numerals in the drawings. (First Embodiment) In this embodiment, an example is described in which the position detection device 1 is used to detect the rotational position of the brake pedal or accelerator pedal of a vehicle's pedal system. In the following description, the brake pedal or accelerator pedal may sometimes be simply referred to as the pedal. As shown in Figures 1 to 3, the position detection device 1 of this embodiment comprises a rotating member 20 and a substrate 30. The rotation axis CL shown in Figures 1 to 3 is the rotation axis 70 of the pedal and the rotation center of the rotating member 20. Furthermore, in this description, the axial direction Da of the rotation axis CL is also referred to as the member axial direction Da, the radial direction Dr of the rotation axis CL is also referred to as the member radial direction Dr, and the circumferential direction Dc of the rotation axis CL is also referred to as the member circumferential direction Dc. These directions Da, Dr, and Dc are intersecting directions, or more precisely, perpendicular directions. Figure 1 is a cross-sectional view showing the section I-I