JP2016009580A - Position detection device and steering lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detection device and a steering lock device capable of suppressing such misdetermination that a magnetic field generator is detected in front of a reference position even in a case where a relative position between the magnetic field generator and a magnetic detection element is shifted.SOLUTION: A position detection device 1 comprises: a first magnetic detection element 12 arranged so that a detection center 120 is located at an intersection point between a circumference of a circle with a point obtained by projecting a center of a magnetic field 181 onto a loading surface 10a of a substrate 10 as a center, and a first straight line 100 based on a locus of a magnet 18 on the loading surface 10a; a second magnetic detection element 13 arranged so that a detection center 130 is located at one of two intersection points between a second straight line 101 orthogonal to the first straight line and the circumference; a third magnetic detection element 14 arranged so that a detection center 140 is located at the other intersection point; and a controller 20 that determines detection of a magnetic field generator not by a detection result of the magnetic detection element that firstly detected the magnet 18 but by detection of the magnet 18 by the remaining magnetic detection elements.

Description

  The present invention relates to a position detection device and a steering lock device.

  As a conventional technique, a lock member that can move between a lock position that engages with a steering shaft of a vehicle and an unlock position that releases the engagement, and a position that corresponds to the lock position and the unlock position are arranged respectively. And a magnetic detecting means for detecting the magnetic force of the magnet, and a control means for controlling the driving of the electric actuator for detecting the position of the locking member and driving the locking member in accordance with the detection result of the magnetic detecting means. A steering lock device is known (for example, refer to Patent Document 1).

  In this electric steering lock device, the magnetic detection means arranged at a position corresponding to the unlock position is composed of a plurality of magnetic detection elements, and the plurality of magnetic detection elements are arranged to be shifted along the moving direction of the magnet. Yes.

JP 2014-4976 A

  However, since the conventional electric steering lock device has a plurality of magnetic detection elements that are shifted along the moving direction of the magnet, if the magnetic detection elements are misplaced or the magnets are misplaced, the lock is locked. There is a possibility that it is erroneously determined that the member has reached the unlock position before it reaches the unlock position.

  Therefore, an object of the present invention is to provide a position detection device that can suppress erroneous determination of detecting a magnetic field generation unit before the reference position even when the relative position between the magnetic field generation unit and the magnetic detection element is shifted. And a steering lock device.

  According to one embodiment of the present invention, a magnetic field generating unit that generates a magnetic field and moves in a first direction and a second direction opposite to the first direction, and a magnetic field generated by a magnetic field generating unit located at a reference position The center of detection is arranged so that the center of detection is located at the intersection of the circumference of a circle centered on the point projected on the mounting surface of the substrate and the first straight line based on the locus of the magnetic field generating unit on the mounting surface A first magnetic detection element, a second magnetic detection element arranged such that the detection center is located at one of two intersections of the second straight line and the circumference orthogonal to the first straight line, and detection on the other It is not the detection result of the magnetic detection element that first detected the magnetic field generation unit among the third magnetic detection element arranged so that the center is located and the first to third magnetic detection elements, Detection and determination of the magnetic field generation unit by the remaining magnetic detection elements detecting the magnetic field generation unit And that the determination unit, to provide a position detecting device provided with a.

  According to the present invention, even if the relative position between the magnetic field generation unit and the magnetic detection element is shifted, it is possible to suppress erroneous determination of detecting the magnetic field generation unit before the reference position.

FIG. 1A is a schematic diagram of the position detection device according to the first embodiment, and FIG. 1B is a block diagram of the position detection device. FIG. 2A is a schematic diagram for explaining the positional relationship between the first to third magnetic detection elements and the magnet of the position detection device according to the first embodiment. (B) is the schematic which shows the detection range and determination range of each magnetic detection element. FIG. 3A is a schematic diagram illustrating a case where the magnet and the magnetic detection element of the position detection device according to the first embodiment are relatively displaced upward in the drawing, and FIG. FIG. 3 is a schematic diagram showing a detection range and a determination range of each magnetic detection element. FIG. 4A is a schematic diagram illustrating a case where the magnet and the magnetic detection element of the position detection device according to the first embodiment are relatively shifted downward in the drawing, and FIG. FIG. 3 is a schematic diagram showing a detection range and a determination range of each magnetic detection element. FIG. 5 is a flowchart for explaining the operation of the position detection apparatus according to the first embodiment. FIG. 6A is a schematic diagram for explaining the positional relationship between the first magnetic detection element to the fourth magnetic detection element of the position detection device of the steering lock device according to the second embodiment and the magnet. FIG. 6B is a block diagram of the steering lock device, and FIG. 6C is a diagram illustrating first to sixth magnetic detection elements of the position detection device according to the third embodiment. It is the schematic for demonstrating the positional relationship of a magnet and a magnet.

(Summary of embodiment)
The position detection device according to the embodiment includes a magnetic field generation unit that generates a magnetic field and moves in a first direction and a second direction opposite to the first direction, and a magnetic field generation unit that is positioned at a reference position. The detection center is located at the intersection of the circumference of a circle centered on the point where the center of the magnetic field to be generated is projected onto the mounting surface of the base material and the first straight line based on the locus of the magnetic field generating unit on the mounting surface. A first magnetic detection element arranged, a second magnetic detection element arranged such that the detection center is located at one of two intersections of the second straight line and the circumference orthogonal to the first straight line, and Of the third magnetic detection element arranged so that the detection center is located on the other side, and the first to third magnetic detection elements, the detection result of the magnetic detection element that first detected the magnetic field generation unit Rather, the remaining magnetic detection element detects the magnetic field generator and generates a magnetic field. It is schematically configured to include the detection and determination unit.

  In this position detection device, the first to third magnetic detection elements are arranged so that the distance from the magnetic field generation unit located at the reference position is equal, and the magnetic field generation unit is first detected. Instead of the detection result of the magnetic detection element, the remaining magnetic detection elements are configured to detect the detection of the magnetic field generation unit by detecting the magnetic field generation unit. Accordingly, since the position detection device is detected by the magnetic detection element far from the magnetic field generation unit, a plurality of magnetic detection elements are arranged along the locus of the detection target, and the detection target is between the two magnetic detection elements. Suppresses misjudgment of detecting the magnetic field generation unit before the reference position even when the relative position of the magnetic field generation unit and the magnetic detection element is deviated compared to those arranged so that the locus of can do.

[First embodiment]
(Overall configuration of the position detection device 1)
FIG. 1A is a schematic diagram of the position detection device according to the first embodiment, and FIG. 1B is a block diagram of the position detection device. FIG. 2A is a schematic diagram for explaining the positional relationship between the first to third magnetic detection elements and the magnet of the position detection device according to the first embodiment. (B) is the schematic which shows the detection range and determination range of each magnetic detection element. 2B, FIG. 3B and FIG. 4B, which will be described later, show the position of the center 180 where the horizontal axis projects the center of the magnet 18 onto the mounting surface 10a. Note that, in each drawing according to the embodiment described below, the ratio between figures may be different from the actual ratio. In FIG. 1B and FIG. 6B described later, the flow of main signals and information is indicated by arrows.

  The position detection apparatus 1 detects the position of a moving body 16 that moves relative to the substrate 10 as shown in FIG. This relative movement is, for example, that the substrate 10 is stationary and the movable body 16 is moved, that the movable body 16 is stationary and the substrate 10 is moved, and that both the substrate 10 and the movable body 16 are moved. Is shown. In the present embodiment, a case where the substrate 10 is stationary and the moving body 16 is moved will be described.

  As shown in FIG. 1A, the moving body 16 has a first direction (arrow A direction) with respect to the substrate 10 and a second direction (arrow B direction) opposite to the first direction. Move to. Further, as shown in FIG. 2A, the moving body 16 is movable so as to pass through the first position 2 and the second position 3 that is the reference position.

  The position detection device 1 is a detection device that mainly detects whether or not the moving body 16 has moved to the second position 3, and the detection result is output to an electromagnetically connected electronic device. The Note that the electromagnetic connection is a connection using at least one of a connection using a conductor, a connection using light which is a kind of electromagnetic wave, and a connection using radio wave which is a kind of electromagnetic wave.

  The position detection device 1 generates a magnetic field and projects a magnetic field generation unit that moves in the directions of arrows A and B and a magnetic field generated by the magnetic field generation unit positioned at the reference position onto the mounting surface of the substrate. The first magnetic detection element 12 is arranged such that the detection center 120 is located at the intersection of the circumference of a circle centered on the first surface and the first straight line based on the locus of the magnetic field generation unit on the mounting surface. The second magnetic detection element 13 is arranged so that the detection center 130 is located at one of the two intersections of the second straight line and the circumference orthogonal to the straight line, and the detection center 140 is located on the other side. Of the detected third magnetic detection element 14 and the first to third magnetic detection elements 14 to 14, not the detection result of the magnetic detection element that first detected the magnetic field generation unit, but the remaining magnetic detection The magnetic field is detected by the element detecting the magnetic field generator. It is schematically configured to include a determination unit and the detection of the raw part.

  As an example, the magnetic field generator is a magnet 18 that generates a magnetic field 181. The center projected on the mounting surface of the base material is the center 180 of the magnet 18 projected onto the mounting surface 10 a of the substrate 10 as the center of the magnetic field 181. This magnetic field generator may be, for example, an electromagnetic magnet.

  The base material is the substrate 10 as an example. The substrate 10 is, for example, a plate-shaped printed wiring board. The first magnetic detection element 12 to the third magnetic detection element 14 are arranged on the mounting surface 10 a of the substrate 10. As shown in FIG. 1B, the determination unit is a control unit 20 as an example.

The reference position described above is the second position 3 shown in FIG. The second position 3 is, for example, a position determined in advance so that the position detection device 1 detects the moving body 16. In FIG. 2 (b), the second position 3, the position _{X 3,} the first position 2 is in the position _{X 0.}

  A first straight line 100 shown in FIG. 2A is a straight line obtained by projecting the trajectory of the moving body 16 onto the mounting surface 10a and further extending it. The first position 2 and the second position 3 are located on the first straight line 100.

  Further, in the position detection device 1, the first magnetic detection element 12 to the third magnetic detection element 14 include a first detection range (detection range 121), a second detection range (detection range 131), and a third detection range. It has a detection range (detection range 141), and the magnet 18 is detected in the detection range 121 to the detection range 141. Furthermore, the determination range 201 that the control unit 20 determines to detect the magnet 18 is determined by the detection range 121 to the detection range 141, and from the second position 3 to the first magnetic detection element 12 to the third magnetic detection element 14. The range in between is larger than the range away from the second position 3.

(Configuration of the first magnetic detection element 12 to the third magnetic detection element 14)
As an example, the first magnetic detection element 12 to the third magnetic detection element 14 are configured to include a Hall element. The detection center of the magnetic detection element indicates, for example, the center of the detection surface of the Hall element. Therefore, if the magnetic detection element includes an amplification unit that amplifies the detection signal, a processing unit that processes the detection signal, and the like, the magnetic detection element may be disposed at a place other than the center of the element. However, it does not always coincide with the element center of the magnetic detection element. In the present embodiment, the element center of the magnetic detection element is matched with the detection center. The magnetic detection element is not limited to the Hall element, and may be a magnetoresistive element that detects a change in the magnetic field.

  As shown in FIG. 2A, the first magnetic detection element 12 is arranged so that the detection center 120 is positioned on a first straight line 100 obtained by extending the locus of the magnet 18. Specifically, the first magnetic detection element 12 is disposed at the intersection of the boundary 182 c of the magnetic field 181 centering on the center 180 of the magnet 18 at the second position 3 that is the reference position and the first straight line 100. The

Boundary 182c of the magnetic field 181 when the magnet 18 is located in the second position 3, as an example, a circumference of a circle with a radius L ₁ with respect to the center 180 that is projected on the mounting surface 10a. Accordingly, the first magnetic detection element 12, the distance between the center 180 and the detection center 120 is _{L 1.}

Position detecting device 1 in this embodiment, the position X ₃ the boundary 182c is consistent with the detection center 120 of the first magnetic detection element 12, the detection and non-detection of the magnet 18 switches the ideal second of Position 3 is set.

  Here, for ease of explanation, the first magnetic detection element 12 to the third magnetic detection element 14 have a boundary 182 of the magnetic field 181 that reaches the magnetic detection element on the paper surface of FIG. It is assumed that the magnet 18 is detected until the detection element is completely included in at least the region surrounded by the boundary 182.

Therefore, as an example, the position of the center 180 of the magnet 18 where the first magnetic detection element 12 may detect the magnet 18 for the first time is a position based on the boundary 182b of the magnetic field 181 as shown in FIG. it is X _2. The second magnetic detection elements 13 and the third magnetic detection element 14 is likely to detect the first magnet 18 position is, for example, a position X ₁ based on the boundary 182a of the magnetic field 181.

In addition, a range in which the first magnetic detection element 12 detects the magnet 18 for the first time is, for example, a detection range 121 shown in FIG. 2B, and ± Δ centered on the second position 3 (position X ₃ ). it is in the range of d _1. This detection range 121 is, for example, between position X ₂ and position X ₄ as shown in FIG. Since the first magnetic detection element 12 is located within the boundary 182 on the right side from the second position 3 in the paper surface of FIG. 2A, the magnet 18 is always detected.

  As an example, the second magnetic detection element 13 and the third magnetic detection element 14 have the detection center 130 and the detection center 140 positioned along a boundary 182c at the second position 3, as shown in FIG. Are arranged to be. Specifically, the second magnetic detection element 13 includes, for example, the intersection on the upper side of the sheet of FIG. 2A among the intersections of the second straight line 101 orthogonal to the first straight line 100 and the boundary 182c. The detection center 130 is disposed at the position. In addition, the third magnetic detection element 14 is arranged so that the detection center 140 is located at the intersection point on the lower side of the sheet of FIG. 2A, for example.

From the center 180 of the magnet 18, which is projected on the mounting surface 10a distance to the detection center 130 of the second magnetic detection elements 13, as shown in FIG. 2 (a), an _{L 2,} from the center 180 third the distance to the detection center 140 of the magnetic sensor 14 is _{L 3.} When the first magnetic detection element 12 to the third magnetic detection element 14 and the magnet 18 are arranged at ideal positions, the distances L ₁ to L ₃ are equal.

Similar to the first magnetic detection element 12, the second magnetic detection elements 13 and the third magnetic detecting elements 14, the position _{X 3} of the boundary 182c coincides with the detection center 130 and the detection center 140, ideal detection The position. As an example, the range in which the second magnetic detection element 13 detects the magnet 18 for the first time is a detection range 131 as shown in FIG. 2B, which is a range of ± Δd ₂ from the second position 3. . This detection range 131 is, for example, between position X ₁ and position X ₅ as shown in FIG.

Moreover, the range of the third magnetic detection element 14 detects the first magnet 18, as an example, as shown in FIG. 2 (b), a detection range 141, the range of ± △ d ₃ from the second position 3 It is. As shown in FIG. 2B, the detection range 141 is, for example, between the position X ₁ and the position X ₅ as shown in FIG. 2B. Note that the second magnetic detection element 13 and the third magnetic detection element 14 are in a state in which the magnet 18 is always detected on the right side from the second position 3 on the paper surface of FIG.

The determination range 201 in which the control unit 20 may detect the magnet 18 is determined by the detection range 121 to the detection range 141 as described above. Specifically, between the position X ₁ of the position X ₂ can not first magnetic detection element 12 detects the magnet 18, the remaining magnetic sensing element between the positions X ₅ from the position X ₄ There is a possibility of detecting the magnet 18. Therefore, determination range 201, is between the position _{X 2} ~ position _{X 5.}

The determination range 201 includes a second position 3 that is a reference position. In addition, the range in which the second position 3 is detected is a range between the second position 3 and the magnetic detection element rather than a range (Δd ₁ ) between the first position 2 and the second position 3. (Δd ₃ ) is larger. The effect that the range between the second position 3 and the magnetic detection element is larger will be described later.

The first magnetic detection element 12 to the third magnetic detection element 14 are connected to the control unit 20 as shown in FIG. The first magnetic detection element 12 to the third magnetic detection element 14 output the first detection value S ₁ to the third detection value S ₃ to the control unit 20.

(Configuration of magnet 18)
The magnet 18 is attached to the arrangement surface 160 of the moving body 16. The arrangement surface 160 faces the mounting surface 10 a of the substrate 10. The magnet 18 has, for example, a quadrangular prism shape. The magnet 18 is, for example, a permanent magnet such as an alnico magnet, a ferrite magnet, or a neodymium magnet, or a magnetic material such as a ferrite, neodymium, samakoba, or samarium iron nitrogen, and polystyrene, polyethylene, or polyamide. , A synthetic magnet material such as acrylonitrile / butadiene / styrene (ABS) and the like, and a plastic magnet formed into a desired shape. The shape of the magnet 18 is not limited to a quadrangular prism shape, and may be a cylindrical shape or the like that generates the magnetic field 181 in which the shape connecting the tip or end of the magnetic vector on the mounting surface 10a is substantially circular. .

  Magnetization of the magnet 18 is, for example, a first magnetic pole (for example, N pole) on the side facing the mounting surface 10a, and a second magnetic pole (for example, S pole) on the side in contact with the moving body 16 that is different from the first magnetic pole. It is. The magnetization is not limited to this, and the first magnetic pole and the second magnetic pole may be reversed. In FIG. 2A, the upper side is the first magnetic pole and the lower side is the second magnetic pole. It may be a magnetic pole.

  The magnet 18 forms a magnetic field 181 having a concentric boundary on the mounting surface 10 a of the substrate 10. The moving body 16 is formed using, for example, a material that does not form a magnetic path by the magnetic field 181 of the magnet 18.

(Configuration of control unit 20)
The control unit 20 includes, for example, a CPU (Central Processing Unit) that performs operations and processes on acquired data according to a stored program, a RAM (Random Access Memory) that is a semiconductor memory, a ROM (Read Only Memory), and the like. Microcomputer. In this ROM, for example, a program for operating the control unit 20 is stored. For example, the RAM is used as a storage area for temporarily storing calculation results and the like.

The control unit 20 has a threshold value 200. This threshold value 200 is compared with each of the first detection value S ₁ to the third detection value S ₃ . For example, when a detection value larger than the threshold value 200 is obtained, the control unit 20 determines that the magnetic detection element has detected the magnet 18, that is, has detected the moving body 16.

  In addition, the control unit 20 is not the detection result of detecting the magnet 18 first among the first magnetic detection element 12 to the third magnetic detection element 14, but when the remaining two magnetic detection elements detect the magnet 18. It is determined that the magnet 18 has reached the second position 3.

Control unit 20 generates the detection information S ₄ based on the detection result, and outputs the connected electronic equipment. The detection information S _4, for example, the moving body 16 includes information indicating whether or not it is detected.

  Below, the detection of the magnet 18 by the shift | offset | difference of the relative position of the magnet 18 and a magnetic detection element is demonstrated.

(Regarding the displacement of the relative position between the magnet 18 and the magnetic detection element)
FIG. 3A is a schematic diagram illustrating a case where the magnet and the magnetic detection element of the position detection device according to the first embodiment are relatively displaced upward in the drawing, and FIG. FIG. 3 is a schematic diagram showing a detection range and a determination range of each magnetic detection element. FIG. 3 (a) shows a case where the relative position between the magnet 18 and the first magnetic detecting element 12 to the third magnetic detecting element 14 is shifted over y ₁ from the first straight line 100. The deviation y ₁ and the later-described deviation y ₂ are assumed to be within tolerances expected when the movable body 16, the magnet 18, the substrate 10, and the like are assembled.

As shown in FIG. 3A, since the third straight line 102 obtained by extending the locus of the magnet 18 on the mounting surface 10a is shifted to the upper side of the drawing with respect to the first straight line 100, the magnet 18 and the second magnetic field The distance of the detection element 13 is closer than the distance between the magnet 18 and another magnetic detection element. Therefore, the magnet 18 is moved from the position _{X 0} in the direction of arrow A, the second magnetic detection elements 13, as shown in FIG. 3 (b), the boundary 182d of the magnetic field 181 reaches the second magnetic detection element 13 detecting the magnet 18 in the position _{X 10} and subsequent detection range 131 (the position _{X 10} ~ position _{X 14).}

Further, the magnet 18 is moved in the direction of arrow A, the boundary 182e of the magnetic field 181 reaches the third magnetic detecting element 14 at position _{X 11.} Thus the third magnetic detecting element 14 detects the magnet 18 in the position _{X 11} and subsequent detection range 141 (the position _{X 11} ~ position _{X 15).}

Furthermore, the magnet 18 is moved in the direction of arrow A, the boundary 182f of the magnetic field 181 reaches the first magnetic detection element 12 at position _{X 12.} Thus the first magnetic detection element 12 detects the magnet 18 in the position _{X 12} and subsequent detection range 121 (the position _{X 12} ~ position _{X 13).}

Here, as shown in FIG. 3B, the control unit 20 does not use the detection result of the magnetic detection element that first detected the magnet 18, so that, for example, the second magnetic detection element 13 is first connected to the magnet 18. Is detected, the detection result is not used to determine the detection of the magnet 18. Further, the control unit 20 monitors the first detection value S ₁ and the third detection value S _{3 of} the first magnetic detection element 12 and the third magnetic detection element 14 while comparing the threshold value 200 with each other. , It is determined that the magnet 18 has reached the second position 3 at a position where both have detected the magnet 18.

The second position 3 when the relative position between the magnet 18 and the first magnetic detection element 12 to the third magnetic detection element 14 is an ideal positional relationship is shown in FIGS. 3A and 3B. as shown in) is the position _{X 3} to form a boundary 182g of the magnetic field 181.

As described above, when the relative position between the magnet 18 and the magnetic detection element is deviated, the determination range 201 determined as reaching the second position 3 is the position X ₁₂ as shown in FIG. ~ position _{X 15} next includes a position _{X 3} of the second position 3. In addition, the range in which the second position 3 is detected is larger in the range between the second position 3 and the magnetic detection element than in the range between the first position 2 and the second position 3. ing.

Then, the following illustrates the case where the relative position between the magnet 18 and the first magnetic detecting element 12 to the third magnetic detecting element 14 is shifted in the y ₂ down from the ideal first straight line 100.

  FIG. 4A is a schematic diagram illustrating a case where the magnet and the magnetic detection element of the position detection device according to the first embodiment are relatively shifted downward in the drawing, and FIG. FIG. 3 is a schematic diagram showing a detection range and a determination range of each magnetic detection element.

As shown in FIG. 4A, the fourth straight line 103 extending the locus of the magnet 18 on the mounting surface 10a is shifted downward with respect to the first straight line 100. The distance of the magnetic detection element 14 is closer than the distance between the magnet 18 and other magnetic detection elements. Therefore, the magnet 18 is moved from the position _{X 0} in the direction of arrow A, the third magnetic detecting elements 14, as shown in FIG. 4 (b), the boundary 182h of the magnetic field 181 reaches the third magnetic detecting elements 14 detecting the magnet 18 in position _{X 20} and subsequent detection range 141 (the position _{X 20} ~ position _{X 24)} in which.

Further, the magnet 18 is moved in the direction of arrow A, the boundary 182i of the magnetic field 181 reaches the first magnetic detection element 12 at position _{X 21.} Thus the first magnetic detection element 12 detects the magnet 18 in the position _{X 21} and subsequent detection range 121 (the position _{X 21} ~ position _{X 23).}

Furthermore, the magnet 18 is moved in the direction of arrow A, the boundary 182j of the magnetic field 181 reaches the second magnetic detection element 13 at position _{X 22.} Thus the second magnetic detection element 13 detects the magnet 18 in the position _{X 22} and subsequent detection range 131 (the position _{X 22} ~ position _{X 25).}

Here, as shown in FIG. 4B, the control unit 20 does not use the detection result of the magnetic detection element that first detected the magnet 18, so that, for example, the third magnetic detection element 14 is first connected to the magnet 18. Is detected, the detection result is not used to determine the detection of the magnet 18. The control unit 20, and a first detection value S ₁ and the second detection value S ₂ and the threshold 200 of the first magnetic detection element 12 and the second magnetic detection element 13 monitors by comparing each , It is determined that the magnet 18 has reached the second position 3 at a position where both have detected the magnet 18.

The second position 3 when the relative position between the magnet 18 and the first magnetic detection element 12 to the third magnetic detection element 14 is an ideal positional relationship is shown in FIGS. 4A and 4B. as shown in) is the position _{X 3} to form a boundary 182k of the magnetic field 181.

As described above, when the relative position between the magnet 18 and the magnetic detection element is shifted, the determination range 201 determined as reaching the second position 3 is a position X ₂₂ as shown in FIG. 4B. ~ position _{X 25} next includes a position _{X 3} of the second position 3. In addition, the range in which the second position 3 is detected is larger in the range between the second position 3 and the magnetic detection element than in the range between the first position 2 and the second position 3. ing.

  Below, operation | movement of the position detection apparatus 1 which concerns on this Embodiment is demonstrated according to the flowchart of FIG.

(Operation)
When power is supplied to the position detection device 1, the first magnetic detection element 12 to the third magnetic detection element 14 send the first detection value S ₁ to the third detection value S ₃ to the control unit 20. Output.

The control unit 20 monitors the position of the magnet 18 while comparing the first detection value S ₁ to the third detection value S ₃ with the threshold value 200 (S 1).

  When the control unit 20 detects the magnet 18 (S2: Yes) and determines that there is one magnetic detection element that detects the magnet 18 (S3: Yes), the control unit 20 discards the determination result (S4). Specifically, as shown in FIG. 3A, the control unit 20 first detects the magnet 18 by the second magnetic detection element 13 by the movement of the moving body 16 when it is shifted to the upper side of the drawing. It is determined that Therefore, the control unit 20 discards the determination result, that is, does not use it for detection of the magnet 18. The control unit 20 may be configured to hold the first determination result and determine that the magnet 18 has reached the second position 3 after detecting the magnet 18 second and third.

  The controller 20 continues to compare the detection values output from the two magnetic detection elements other than the magnetic detection element that has detected the magnet 18 with the threshold value 200 and monitor the position of the magnet 18 (S5).

  When the remaining magnetic detection element detects the magnet 18 (S6: Yes), the control unit 20 determines that the magnet 18 has reached the second position 3, that is, the moving body 16 has reached the second position 3. (S7). Specifically, after the third magnetic detection element 14 detects the magnet 18, the control unit 20 moves the moving body 16 to the second position 3 when the first magnetic detection element 12 detects the magnet 18. Judge that it has reached.

Control unit 20 generates the detection information S ₄ indicating that the moving body 16 reaches the second position 3, ends the operation of detecting the second position 3 and outputs the electromagnetically connected electronic equipment To do.

  Here, in step 2, when the magnet 18 is not detected (S2: No), the control unit 20 returns to step 1 and continues monitoring.

  In Step 3, when the two magnetic detection elements detect the magnet 18 substantially simultaneously (S3: No), the process proceeds to Step 5, and the remaining detection results are not discarded. It is monitored whether the magnetic detection element detects the magnet 18. Specifically, as shown in FIG. 2A, when the relative position between the magnet 18 and the first magnetic detection element 12 to the third magnetic detection element 14 is an ideal relative position, There is a possibility that the magnetic detection element 13 and the third magnetic detection element 14 detect the magnet 18 substantially simultaneously. Therefore, the control unit 20 determines that the moving body 16 has reached the second position 3 when the remaining first magnetic detection element 12 detects the magnet 18.

  Note that “substantially simultaneous” means that when the magnetic detection elements periodically output detection values, the two magnetic detection elements simultaneously detect the magnet 18 within the same period. In addition, when the detection values of the first magnetic detection element 12 to the third magnetic detection element 14 are compared with the threshold value 200 in order, the two magnetic detection elements detect the magnet 18 until one cycle. At the same time.

  In step 6, the control unit 20 returns to step 5 and monitors the detection value until the remaining magnetic detection elements detect the magnet 18.

(Effects of the first embodiment)
The position detection device 1 according to the present embodiment has a second position that is a reference position even when the relative position between the magnet 18 and the first magnetic detection element 12 to the third magnetic detection element 14 is deviated. An erroneous determination of detecting the magnet 18 before 3 can be suppressed.

  Specifically, in the position detection device 1, the first magnetic detection element 12 to the third magnetic detection element 14 are arranged so that the distance from the magnet 18 located at the second position 3 is equal. At the same time, instead of the detection result of the magnetic detection element that first detected the magnet 18, the detection of the magnet 18 is determined when the remaining magnetic detection element detects the magnet 18.

  As shown in FIG. 3A, when the relative position is shifted, the determination range 201 indicating the range in which the position of the magnet 18 is detected is larger than the range between the first position 2 and the second position 3. The range after the second position 3 is wider. In addition, it is easy to set the range between the first position 2 and the second position 3 so as to be within the range of the intersection set in advance in the position detection device 1 because this range is small. Therefore, for example, even if the control unit 20 determines that the magnet 18 has reached the second position 3 in the range, no erroneous determination is made.

  Therefore, since the position detection device 1 is mainly detected by the magnetic detection element far from the magnet 18, a plurality of magnetic detection elements are arranged along the locus of the magnet and between the two magnetic detection elements. Even if the relative positions of the magnet 18 and the first to third magnetic detection elements 12 to 14 are deviated from those arranged so that the path of the magnet is located, the second position An erroneous determination of detecting the magnet 18 before 3 can be suppressed.

  Moreover, since the position detection apparatus 1 determines the position of the magnet 18 based on the combination of the detection results of the three magnetic detection elements, erroneous determination due to a disturbance magnetic field can be suppressed.

  Furthermore, the position detection device 1 determines the second position 3 as the reference position, and arranges the magnet 18 and the first magnetic detection element 12 to the third magnetic detection element 14 as described above, thereby Since the erroneous determination of detecting the magnet 18 before the position 3 of 2 can be suppressed, compared with the case where the magnetic detection element is arranged away from the position so as not to detect before the position to be detected. Can be downsized.

[Second Embodiment]
In the second embodiment, the position detection device 1 of the first embodiment is used for detection of the lock bar 16a of the steering lock device 5.

  FIG. 6A is a schematic diagram for explaining the positional relationship between the first magnetic detection element to the fourth magnetic detection element of the position detection device of the steering lock device according to the second embodiment and the magnet. FIG. 6B is a block diagram of the steering lock device. In the embodiments described below, parts having the same functions and configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  As an example, the position detection device 1 is used to detect the position of the lock bar 16a of the steering lock device 5 that locks and unlocks the rotation of the steering shaft of the vehicle.

As shown in FIGS. 6A and 6B, the steering lock device 5 suppresses the rotation of the steering shaft of the vehicle at the lock position 50 and the position detection device 1 described above, and at the unlock position 51. Based on the lock bar 16a that allows the rotation of the steering, the fourth magnetic detection element 15 that detects the lock position 50, the detection information S ₄ acquired from the position detection device 1, and the vehicle information S ₅ output from the vehicle. drive signal and the control unit 52 for generating S _6, a motor 53 for driving the lock bar 16a to the locked position 50 and an unlocked position 51 on the basis of the drive signal S _6, it is schematically configured with a Te.

  The lock bar 16 a is an example of the moving body 16. A magnet 18 is attached to the lock bar 16a. The lock bar 16a has a lock position 50 at a position where the lock bar 16a is fitted in a recess formed in the circumferential direction of the steering shaft, and an unlock position 51 at a position where the lock bar 16a is removed from the recess. 6A, the lock bar 16a reaches the lock position 50 when driven in the arrow B direction, and reaches the unlock position 51 when driven in the arrow A direction.

  The fourth magnetic detection element 15 is, for example, the same Hall element as the first magnetic detection element 12 to the third magnetic detection element 14. For example, as shown in FIG. 6A, the fourth magnetic detection element 15 has a detection center 150 on the first straight line 100 and a magnetic field 181 when the magnet 18 is positioned at the lock position 50. The boundary 182 is located at the detection center 150.

The control part 52 is a microcomputer provided with CPU etc., for example. Or controller 52, for example, by driving the lock bar 16a to the locked position 50 based on the vehicle information S ₅ to obtain from the vehicle control unit for controlling the electronic device mounted on a vehicle to drive the unlocked position 51 Determine. The control unit 52 is, for example, and generates the position information S ₇ indicating the position of the lock bar 16a outputs to the vehicle control unit.

  Specifically, the lock bar 16a is driven to the lock position 50 by the motor 53, for example, when the key is removed from the ignition key or when the engine is stopped by opening the door by pressing the start button, When the key is inserted into the ignition key or when the start button is pushed down to drive the engine, the motor 53 drives the unlock position 51.

Note that the vehicle information S ₅ described above, as an example, is output in accordance with the state of the vehicle is information that instructs the drive to the unlock position 51 or the unlock position 51 of the lock bar 16a.

  Here, when the operator starts the engine, the lock bar 16 a must be surely moved to the unlock position 51. Therefore, the position detection device 1 needs to reliably detect the unlock position 51 of the lock bar 16a. As described in the first embodiment, the position detection apparatus 1 of the present embodiment sets the unlock position 51 as the second position 3 by the first magnetic detection element 12 to the third magnetic detection element 14. Since it is configured to detect, the unlock position 51 can be reliably detected.

  The motor 53 is, for example, a DC (Direct Current) motor. The steering lock device 5 may drive the lock bar 16a directly by the motor 53, for example, or may drive the lock bar 16a via a gear portion in which a plurality of gears are combined.

  Below, operation | movement of the steering lock apparatus 5 is demonstrated. In addition, the vehicle shall employ | adopt the system which can perform a door lock and unlock, an engine start, a stop, etc. by carrying an electronic key as an example. In this system, the start and stop of the engine are instructed by depressing the start button.

(Operation)
The operator carries the electronic key to unlock the vehicle door and enters the vehicle. At this time, the lock bar 16a is located at the lock position 50 and locks the rotation of the steering shaft of the vehicle.

When the operator depresses the start button in order to start the engine, the vehicle control unit of the vehicle, based on the depression of the start button, generates vehicle information S ₅ for driving the lock bar 16a in the unlocked position 51 And output to the control unit 52 of the steering lock device 5.

Control unit 52 generates a drive signal S ₆ for driving the lock bar 16a in the unlocked position 51 to drive the motor 53 based on the vehicle information S ₅ obtained.

The position detection device 1 monitors the position of the lock bar 16a via the magnet 18 as in the first embodiment. Position detecting device 1, the lock bar 16a in the unlocked position 51 is determined to have reached, and generates and outputs detection information S ₄ to the control unit 52 of the steering lock device 5.

Control unit 52, the lock bar 16a on the basis of the detected information S ₄ is determined to have reached the unlocked position 51, stops the driving of the motor 53, the position information lock bar 16a is positioned at the unlock position 51 S ₇ is generated and output to the vehicle control unit.

Vehicle control unit, the lock bar 16a is determined to be located in the unlocked position 51 on the basis of the position information S _7, to start the engine.

  Next, the operation of the steering lock device 5 when the operator stops the engine will be described.

When the operator depresses the start button to stop the engine, the vehicle control unit of the vehicle gives an instruction to stop the engine based on the depression of the start button. Vehicle control unit, after the engine is stopped, as an example, the door of the vehicle is opened, the control unit 52 of the steering lock device 5 generates the vehicle information S ₅ for driving the lock bar 16a to the locked position 50 Output to.

Control unit 52 generates a drive signal S ₆ for driving the lock bar 16a to the locked position 50 to drive the motor 53 based on the vehicle information S ₅ obtained.

The position detection device 1 monitors the position of the lock bar 16 a using the fourth magnetic detection element 15. Position detecting device 1 based on the detection result of the fourth magnetic detecting element 15 of the lock bar 16a to the locked position 50 is determined to have reached, the control unit 52 of the steering lock device 5 generates the detection information S ₄ Output to.

Control unit 52, the lock bar 16a is determined to have reached the locking position 50 on the basis of the detected information S _4, stops the driving of the motor 53, the position information S ₇ the lock bar 16a is positioned at the lock position 50 Generate and output to the vehicle control unit. The steering lock device 5 finishes locking the steering shaft.

(Effect of the second embodiment)
The steering lock device 5 according to the present embodiment can reliably detect the unlock position 51. Therefore, the steering lock device 5 can prevent an erroneous determination that the lock bar 16a is located in the recess of the steering shaft but is in the unlock position 51.

[Third Embodiment]
The third embodiment is the above-described implementation in that the fourth magnetic detection element 12a to the sixth magnetic detection element 14a are arranged in the same arrangement as the first magnetic detection element 12 to the third magnetic detection element 14. The form is different.

  FIG. 6C is a schematic diagram for explaining the positional relationship between the first to sixth magnetic detection elements and the magnet of the position detection device according to the third embodiment.

  The position detection apparatus 1 according to the present embodiment is configured to detect a first operation position 6 and a second operation position 7, for example, as shown in FIG. On the first operation position 6 side, the fourth magnetic detection element 12a to the sixth magnetic detection element 14a are arranged. Further, the first magnetic detection element 12 to the third magnetic detection element 14 are arranged on the second operation position 7 side.

  The fourth magnetic detection element 12 a to the sixth magnetic detection element 14 a pass through the centers of the first operation position 6 and the second operation position 7 and are perpendicular to the first straight line 100. About the axis, the first magnetic detection element 12 to the third magnetic detection element 14 are arranged in a line-symmetric position.

  Accordingly, the detection center 120a to the detection center 140a of the fourth magnetic detection element 12a to the sixth magnetic detection element 14a are located on the boundary 182 of the magnetic field 181 of the magnet 18 located at the first operation position 6.

  The magnet 18 is attached to the operation part which can be operated in the arrow A direction and the arrow B direction as an example.

  The detection of the magnet 18 located at the first operation position 6 and the second operation position 7 is performed in the same manner as in the first embodiment.

(Effect of the third embodiment)
The position detection device 1 according to the present embodiment can reliably detect the first operation position 6 and the second operation position 7.

  As a modification, the position detection device 1 has a configuration in which three magnetic detection elements are arranged in the vicinity of the vertex of the cross so as to detect the position of the magnet 18 attached to the operation unit operable in the intersecting direction. May be.

  As mentioned above, although some embodiment and modification of this invention were demonstrated, these embodiment and modification are only examples, and do not limit the invention based on a claim. These novel embodiments and modifications can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the scope of the present invention. In addition, not all combinations of features described in these embodiments and modifications are necessarily essential to the means for solving the problems of the invention. Furthermore, these embodiments and modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Position detection apparatus, 2 ... 1st position, 3 ... 2nd position, 5 ... Steering lock apparatus, 6 ... 1st operation position, 7 ... 2nd operation position, 10 ... Board | substrate, 10a ... Mounting surface , 12 to 15: First magnetic detection element to fourth magnetic detection element, 12a to 14a: Fourth magnetic detection element to sixth magnetic detection element, 16: Moving body, 16a: Lock bar, 18: Magnet , 20 ... control unit, 50 ... lock position, 51 ... unlock position, 52 ... control unit, 53 ... motor, 100 to 104 ... first straight line to fifth straight line, 120 ... detection center, 120a ... detection center, 121 ... detection range, 130 ... detection center, 131 ... detection range, 140 ... detection center, 140a ... detection center, 141 ... detection range, 150 ... detection center, 160 ... placement plane, 180 ... center, 181 ... magnetic field, 182 ... Boundary, 182a-182k ... Field, 200 ... threshold, 201 ... determination range

Claims (3)

A magnetic field generator that generates a magnetic field and moves in a first direction and a second direction opposite to the first direction;
The first is based on the circumference of a circle centered on a point obtained by projecting the center of the magnetic field generated by the magnetic field generating unit located at the reference position onto the mounting surface of the base material and the locus of the magnetic field generating unit on the mounting surface. The detection center is located at one of the two intersections of the first magnetic detection element disposed so that the detection center is located at the intersection with the straight line, the second straight line orthogonal to the first straight line, and the circumference. A second magnetic sensing element arranged so as to be located, and a third magnetic sensing element arranged so that the detection center is located on the other side,
Of the first to third magnetic detection elements, not the detection result of the magnetic detection element that first detected the magnetic field generation unit, but the remaining magnetic detection elements detected the magnetic field generation unit And a determination unit for determining the detection of the magnetic field generation unit,
A position detection device comprising: The first magnetic detection element to the third magnetic detection element have a first detection range to a third detection range, and the magnetic field generator is arranged in the first detection range to the third detection range. Detect
The determination range in which the determination unit determines that the magnetic field generation unit is detected is determined by the first detection range to the third detection range, and the first magnetic detection element to the third magnetic detection from the reference position. The range between the elements is larger than the range away from the reference position,
The position detection device according to claim 1. A lock bar that suppresses rotation of the steering shaft of the vehicle in the locked position and allows rotation of the steering in the unlocked position;
A magnetic field generator disposed on the lock bar and generating a magnetic field and moving in a first direction toward the lock position and in a second direction toward the unlock position;
The first is based on the circumference of a circle centered on a point obtained by projecting the center of the magnetic field generated by the magnetic field generating unit located at the reference position onto the mounting surface of the base material and the locus of the magnetic field generating unit on the mounting surface. The detection center is located at one of the two intersections of the first magnetic detection element disposed so that the detection center is located at the intersection with the straight line, the second straight line orthogonal to the first straight line, and the circumference. A second magnetic sensing element arranged so as to be located, and a third magnetic sensing element arranged so that the detection center is located on the other side,
Of the first to third magnetic detection elements, not the detection result of the magnetic detection element that first detected the magnetic field generation unit, but the remaining magnetic detection elements detected the magnetic field generation unit And a determination unit that determines that the lock bar is in the unlock position,
Steering lock device with

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