JP2014095615A - Magnetic detection unit and stroke detection device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic detection unit used mainly for detecting an operation amount of a brake pedal etc. of a vehicle and a stroke detection device using the same capable of precisely and reliably detecting an operation amount of a pedal.SOLUTION: A magnetic detection unit 14 is constituted of magnetic member 19 disposed adjacent to a magnetic detecting means 16 stored in a generally box-like case 18. A stroke detection device 22 is constituted of the magnetic detection unit 14 disposed being opposed to a magnet 13 mounted on an operation member 12 including a predetermined gap, which is interlocked with a pedal to move together. Since the operation member 12 and the magnet 13 can be largely moved and the magnetic flux in the magnetic field of the magnet 13 detected by a magnetic detecting means 16 is increased, the magnetism can be detected in a range of long stroke. Thus, the operation amount of the pedal can be precisely and detected reliably.

Description

  The present invention relates to a magnetic detection unit mainly used for detecting an operation amount of a brake pedal or the like of an automobile, and a stroke detection device using the same.

  In recent years, as the functionality of automobiles has improved, the number of operations that detect the amount of depression of a brake pedal, etc., by using various rotation angle detection devices and stroke detection devices, and the like, has been increased. Yes.

  Such a conventional rotation angle detection device will be described with reference to FIG.

  FIG. 4 is a side view of a conventional brake pedal. In FIG. 4, reference numeral 1 denotes a rotation angle detection device, in which a rotating body (not shown) is rotatably housed in an insulating resin case (not shown). In addition, a plurality of magnets 2 are attached to the rotating body.

  The rotation angle detection device 1 is mounted in the vicinity of the rotation shaft 3A of the brake pedal 3 of the automobile, and the center of the rotation body is mounted on the rotation shaft 3A, and is disposed opposite to the magnet 2 with a predetermined gap. The magnetic detection means (not shown) such as the Hall IC is electrically connected to an electronic circuit (not shown) of the vehicle via a connector, a lead wire (not shown) or the like.

  In the above configuration, when the brake pedal 3 is stepped on with a foot, the rotating body of the rotation angle detecting device 1 is rotated with the rotation of the arm 3B, and the mounted magnet 2 is also rotated. The direction of the magnetic field flowing to the magnetic detection means changes.

  And this magnetism is detected by the magnetism detection means, performs a predetermined calculation, calculates the rotation angle of the rotating body, that is, the operation amount by which the brake pedal 3 is depressed, and this is output to the electronic circuit of the automobile body, Various controls of the vehicle are performed according to the amount of depression.

  That is, by rotating the brake pedal 3, the rotating body of the rotation angle detecting device 1 and the magnet 2 are rotated, and the rotation angle of the rotating body, that is, the brake pedal 3 is determined from the change in magnetism detected by the magnetism detecting means. The operation amount depressed is detected and various controls of the vehicle are performed.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP 2010-223656 A

  However, in the above conventional rotation angle detection device, the magnet 2 is rotated within a range of several tens of rotation angles at which the brake pedal 3 is depressed, and the change in magnetism is detected by the magnetism detection means. 3 is detected, it is difficult to detect the operation amount of the brake pedal 3 with high accuracy.

  An object of the present invention is to solve such a conventional problem, and to provide a magnetic detection unit capable of reliably detecting a pedal operation amount with high accuracy and a stroke detection device using the same. And

  In order to achieve the above object, the present invention forms a magnetic detection unit by providing a magnetic body near a magnetic detection means in a substantially box-shaped case, and moves the magnetic detection unit in conjunction with a pedal. The stroke detecting device is configured by arranging the magnet mounted on the actuating body so as to face each other with a predetermined gap therebetween, and the actuating body and the magnet are largely moved in accordance with the depressing operation of the pedal. By providing a magnetic body in the vicinity of the magnet, the magnetic flux of the magnet detected by the magnetism detection means is strengthened, and the magnetism can be detected over a long stroke range, which enables highly accurate and reliable detection of the pedal operation amount. The magnetic detection unit and the stroke detection device using the same can be obtained.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to realize a magnetic detection unit capable of accurately detecting a pedal operation amount with high accuracy and a stroke detection device using the magnetic detection unit. .

Sectional drawing of the stroke detection apparatus by one embodiment of this invention Partial perspective view Waveform diagram Side view of a conventional brake pedal

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment)
FIG. 1 is a cross-sectional view of a stroke detecting device according to an embodiment of the present invention, in which 11 is a substantially box-shaped housing made of an insulating resin such as polybutylene terephthalate or ABS, and 12 is a substantially cylindrical shape. An operating body 12 is housed in a casing 11 so as to be movable in the left-right direction, using an operating body made of an insulating resin such as polyoxymethylene or a non-magnetic material such as aluminum.

  Reference numeral 13 denotes a substantially ring-shaped magnet such as ferrite or Nd—Fe—B alloy, and the left and right surfaces are magnetized to the N pole and the S pole, and the magnet 13 is mounted on the outer periphery of the intermediate portion of the operating body 12. A magnetic field is formed in the left-right direction of the moving direction of the operating body 12.

  A magnetic detection unit 14 has a plurality of wiring patterns (not shown) formed of copper foil or the like on the upper and lower surfaces thereof. A plurality of magnetic detection means 16 are mounted and mounted, and a plurality of terminals 17 such as a copper alloy connected to the magnetic detection means 16 via a wiring pattern are implanted on the upper surface of the wiring board 15.

  Further, the wiring board 15 and the magnetic detection means 16 are accommodated in a case 18 made of an insulating resin such as polybutylene terephthalate in a substantially box shape, and on the left and right sides of the magnetic field direction of the magnet 13 near the magnetic detection means 16. A plurality of magnetic bodies 19 such as iron, nickel, and ferrite are provided to constitute a magnetic detection unit 14.

  Then, the magnetic detection unit 14 is mounted on the upper surface of the housing 11, and the magnetic detection means 16 and the plurality of left and right magnetic bodies 19 are fixed to the magnet 13 as shown in a partial perspective view of FIG. Oppositely arranged with a gap.

  In addition, 20 is an insulating resin or metal operating shaft, 21 is a spring in which a steel or copper alloy wire is wound in a coil shape, and the right side of the operating body 12 and the right side of the housing 11 are in a state where the spring 21 is slightly bent. The stroke detecting device 22 is configured by mounting between the side surfaces and the operating shaft 20 fixed to the left end of the operating body 12 projecting leftward from the housing 11.

  Further, the tip of the operating shaft 20 protruding from the housing 11 is attached to the arm 23A of the brake pedal 23, the stroke detection device 22 is attached to the automobile, and the magnetic detection means 16 of the magnetic detection unit 14 has a plurality of terminals. 17 is electrically connected to an electronic circuit (not shown) of the vehicle via a connector, a lead wire (not shown) or the like.

  In the above configuration, when the brake pedal 23 is stepped on with the foot, the arm 23A rotates about the rotation shaft 23B, and the operating body 12 is pressed by the arm 23A via the operation shaft 20 and moves to the right. The magnet 13 attached to the outer periphery of the intermediate part also moves to the right.

  The magnetism detection means 16 of the magnetism detection unit 14 detects the magnetism direction of the magnet 13, performs a predetermined calculation, and moves the magnet 13 around 40 to 50 mm as shown in the waveform diagram of FIG. A voltage waveform L1 that changes in accordance with the distance, that is, the stroke is output from the magnetic detection means 16 to the electronic circuit of the vehicle.

  At this time, since the range in which the magnetism detection means 16 can detect the magnetism of the magnet 13 is originally the range of the stroke S2, the voltage waveform L2 should be output, but the magnet 13 in the vicinity of the magnetism detection means 16 should be output. A plurality of magnetic bodies 19 are provided on the left and right sides of the magnetic field direction, and the magnetic body 19 increases the magnetic flux of the magnetic field of the magnet 13 detected by the magnetic detection means 16. Detection is performed, and a voltage waveform L1 that changes in accordance with the long stroke S1 is output.

  Then, from this voltage waveform L1, the electronic circuit calculates the stroke of the magnet 13, that is, the operation amount by which the brake pedal 23 is depressed, and controls the brake device according to the depression amount and turns off the stop lamp. Various controls are performed.

  That is, the actuating body 12 and the magnet 13 of the stroke detection device 22 are moved by depressing the brake pedal 23, and the magnet is obtained from the voltage waveform L1 that changes according to the stroke detected by the magnetic detection means 16 of the magnetic detection unit 14. 13 strokes, that is, an operation amount by which the brake pedal 23 is depressed, is detected, and various controls of the vehicle are performed.

  At this time, in the stroke detection device 22 of the present invention, the magnetism detection means 16 of the magnetism detection unit 14 is provided with a predetermined gap in the magnet 13 mounted on the operating body 12 that moves in conjunction with the brake pedal 23. Are arranged opposite to each other and a magnetic body 19 is provided in the vicinity of the magnetic detection means 16 so that the operation amount of the brake pedal 23 can be detected with high accuracy and reliability.

  That is, the angle at which the brake pedal 23 is depressed and the arm 23A rotates about the rotation shaft 23B is in the range of several tens of degrees. However, the operating body 12 and the magnet 13 are attached to the arm 23A via the operation shaft 20. Since it is pressed and moves as large as around 40 to 50 mm as described above, the operation amount of the brake pedal 23 can be detected with high accuracy by detecting the magnetism of the magnet 13 with this long stroke. ing.

  Furthermore, by providing a plurality of magnetic bodies 19 on the left and right of the magnetic field direction of the magnet 13 in the vicinity of the magnetic detection means 16 of the magnetic detection unit 14, and increasing the magnetic flux of the magnetic field of the magnet 13 detected by the magnetic detection means 16, the above-mentioned Thus, the magnetic detection means 16 can reliably detect the magnetism of the magnet 13 in the range of the long stroke S1.

  That is, by providing a plurality of magnetic bodies 19 in the left-right direction of the moving direction of the operating body 12 in the vicinity of the magnetic detection means 16 of the magnetic detection unit 14, the magnetic field of the magnet 13 detected by the magnetic detection means 16 by the magnetic body 19. Therefore, the magnetic detection means 16 is configured to detect magnetism in the range of the long stroke S1.

  In the above description, the configuration in which the voltage waveform is directly output from the magnetic detection means 16 of the magnetic detection unit 14 to the electronic circuit of the vehicle via the plurality of terminals 17 and the like has been described. It is possible to implement the present invention even if the control means is provided by electronic parts such as, and the control means calculates the operation amount of the brake pedal 23 or detects a failure or the like.

  In the above description, the configuration in which the operation amount of the brake pedal 23 is detected by the magnetic detection unit 14 or the stroke detection device 22 has been described. However, for example, the operation amount of an accelerator pedal other than the brake pedal can be detected or exhaust gas can be detected. It can also be used for detecting the vertical stroke of the valve of the recirculation device, detecting the vertical and horizontal stroke of the headlamp, and the like.

  Thus, according to the present embodiment, the magnetic detection unit 14 is formed by providing the magnetic body 19 in the vicinity of the magnetic detection means 16 in the substantially box-shaped case 18, and the magnetic detection unit 14 is connected to the pedal. The stroke detection device 22 is configured by disposing the magnet 13 mounted on the operating body 12 that moves in conjunction with the magnet 13 with a predetermined gap therebetween, so that the operating body 12 Since the magnet 13 is moved greatly and the magnetic body 19 is provided in the vicinity of the magnetic detection means 16, the magnetic flux of the magnetic field of the magnet 13 detected by the magnetic detection means 16 is increased, and magnetism can be detected in a long stroke range. Thus, it is possible to obtain a magnetic detection unit capable of accurately detecting the operation amount of the pedal with high accuracy and a stroke detection device using the magnetic detection unit.

  The magnetic detection unit and the stroke detection device using the magnetic detection unit according to the present invention have an advantageous effect that a highly accurate and reliable detection of the pedal operation amount can be obtained. This is useful for operating brake pedals.

DESCRIPTION OF SYMBOLS 11 Housing | casing 12 Actuator 13 Magnet 14 Magnetic detection unit 15 Wiring board 16 Magnetic detection means 17 Terminal 18 Case 19 Magnetic body 20 Actuation axis 21 Spring 22 Stroke detection device 23 Brake pedal 23A Arm 23B Rotation axis

Claims (2)

A magnetic detection unit in which a magnetic detection means for detecting the magnetic direction of magnets arranged opposite to each other is provided in a substantially box-shaped case, and a magnetic material is provided in the vicinity of the magnetic detection means. A stroke detection device in which a magnet mounted on an operating body that moves in conjunction with a pedal is arranged to face the magnetism detection unit according to claim 1 with a predetermined gap.

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