JP2012112932A - Rotation angle detection device - Google Patents

Abstract

[PROBLEMS] To provide a rotation angle detecting device mainly used for detecting a rotation angle of a brake pedal or the like of an automobile and capable of reliably detecting a rotation angle and turning off a stop lamp with a simple configuration. Objective.
A plurality of magnetic detection elements 18A and 18B are arranged opposite to each other at a predetermined angular interval with respect to a rotation center of a magnet 16 mounted on a rotating body 12, and a control circuit 19 has a plurality of magnetic detection elements 18A and 18B. By adding or subtracting the detection signals L1 and M1 from, and detecting the rotation angle of the rotating body 12 from the calculation signals N1 and P1, it is possible to detect the rotation angle with high accuracy, and with a simple configuration, reliable rotation A rotation angle detection device capable of detecting the angle and turning off the stop lamp can be obtained.
[Selection] Figure 1

Description

  The present invention relates to a rotation angle detecting device mainly used for detecting a rotation angle of a brake pedal or the like of an automobile.

  In recent years, as the functions of automobiles have advanced, the number of vehicles that perform various controls by detecting the amount of depression and the rotation angle of a brake pedal using various rotation angle detection devices and various switches has been increasing.

  Such a conventional rotation angle detection device and stop lamp control push switch will be described with reference to FIGS.

  FIG. 14A is a perspective view of a conventional rotation angle detection device, in which a rotary body 2 is rotatably housed in a substantially box-shaped case 1 made of an insulating resin, and the rotary body 2 is shown in FIG. At one end, a lever 2A that protrudes outward from the side opening of the case 1 is provided.

  A coiled spring (not shown) is mounted between the inner wall of the case 1 and the rotating body 2 in a slightly bent state, and the rotating body 2 is urged to a predetermined angle by the spring, so that the lever 2A is held at a predetermined position.

  Further, a magnet (not shown) is attached to the rotating body 2 and a magnetic detection element (not shown) such as a Hall element is disposed in the case 1 so as to face the magnet with a predetermined gap. The rotation angle detection device 5 is configured.

  FIG. 14B is a perspective view of a conventional push switch. In FIG. 14B, an actuating body 7 is accommodated in a substantially box-shaped case 6 made of an insulating resin so as to be movable up and down. An operation shaft 7A at the upper end of 7 projects upward from the upper surface of the case 6.

  A coiled spring (not shown) is mounted between the inner bottom surface of the case 6 and the lower end of the operating body 7 in a slightly bent state, and the operating body 7 is biased upward by this spring.

  Further, a switch contact is formed in the case 6 by a movable contact made of conductive metal (not shown) mounted on the operating body 7 and a fixed contact (not shown) implanted in the case 6 to push the switch. A switch 10 is configured.

  Then, as shown in the side view of FIG. 15, the rotation angle detection device 5 configured as described above is equipped with a lever 2A on the arm 31A in the vicinity of the rotation axis of the brake pedal 31 of the automobile and magnetic detection. The element is connected to a vehicle electronic circuit (not shown) or the like by a lead wire, a connector (not shown) or the like.

  Further, the push switch 10 is mounted in front of the brake pedal 31 in a state where the operation shaft 7A is pressed by the arm 31A, and the switch contact is connected to a vehicle stop lamp (not shown) or the like by a lead wire or a connector. Connected to electronic circuit etc.

  That is, as shown in FIG. 15, when the brake pedal 31 is not depressed and the push rod 33 protruding from the cylinder body 32 is extended, the actuating body 7 of the push switch 10 is pressed while bending the spring to move the push rod 33. Since the contact is separated from the fixed contact and the switch contact is electrically disconnected, the stop lamp is turned off.

  In the above configuration, when the brake pedal 31 is depressed, the arm 31A rotates to move away from the tip of the operation shaft 7A of the push switch 10 and the pressing force is removed, so that the operating body 7 is restored to the original by the elastic return force of the spring. While moving to the position, the movable contact contacts the fixed contact, the switch contact is electrically connected, and the stop lamp is lit.

  Further, as the brake pedal 31 is rotated, the lever 2A of the rotation angle detection device 5 is swung so that the rotating body 2 rotates while bending the spring, and the magnet mounted on the rotating body 2 also rotates. The direction of the magnetic field flowing from the magnet to the opposing magnetic detection element changes.

  The magnetism detection element detects the strength of the magnetism, and the electronic circuit of the vehicle calculates the rotation angle of the rotating body 2, that is, the depression amount of the brake pedal 31, based on the angle signal output from the magnetism detection element. Various controls of the vehicle are performed according to the amount of depression.

  That is, by operating the brake pedal 31, the actuating body 7 of the push switch 10 is moved up and down, and the switch contacts are electrically connected and separated, thereby turning off the stop lamp and rotating the rotating body of the rotation angle detecting device 5. 2 and the magnet are rotated, and the electronic circuit detects the rotation angle of the rotating body 2, that is, the depression amount of the brake pedal 31 from the change in magnetism detected by the magnetic detection element, so that various controls of the vehicle are performed. It was composed.

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

JP 2001-317909 A

  However, in the conventional rotation angle detection device 5 and the push switch 10 described above, when these are mounted on the brake pedal 31 of the vehicle, the rotation angle detection device 5 of the brake pedal 31 is kept in a state where the rotating body 2 is slightly rotated. The switch contact is electrically connected reliably when the brake pedal 31 is depressed and the switch contact is electrically disconnected when the brake pedal 31 is depressed, while being mounted near the rotation shaft. Since it is necessary to attach the push switch 10 to the brake pedal 31 while adjusting the mounting position, the number of components is large, and there is a problem that the mounting is troublesome.

  The present invention solves such a conventional problem, and can be easily mounted on a brake pedal or the like, and can rotate with a simple configuration capable of reliably detecting a rotation angle and turning off a stop lamp. An object is to provide an angle detection device.

  In order to achieve the above object, in particular, the present invention provides a plurality of magnetic detection elements opposed to each other at a predetermined angular interval with respect to a rotation center of a magnet mounted on a rotating body, and a control circuit includes a plurality of magnetic detection elements. The rotation angle detection device is configured to detect the rotation angle of the rotating body by adding or subtracting the detection signals from.

  According to the present invention, a plurality of magnetic detection elements are arranged opposite to each other at a predetermined angular interval with respect to the rotation center of the magnet mounted on the rotating body, and the control circuit adds or detects detection signals from the plurality of magnetic detection elements. By subtracting and configured to detect the rotation angle of the rotating body, the control circuit can detect the rotation angle with high accuracy by adding or subtracting detection signals from a plurality of magnetic detection elements, Since a switching signal for turning off / off the stop lamp can also be output from one control circuit, a rotation angle detecting device capable of reliably detecting the rotation angle and turning off / off the stop lamp with a simple configuration is obtained. be able to.

Sectional drawing of the rotation angle detection apparatus by the 1st Embodiment of this invention Exploded perspective view Partial perspective view Same block circuit diagram Side view Waveform diagram The block circuit diagram of the rotation angle detection apparatus by the 2nd Embodiment of this invention Waveform diagram Waveform diagram Sectional drawing of the rotation angle detection apparatus by the 3rd Embodiment of this invention Exploded perspective view Same block circuit diagram Same block circuit diagram A perspective view of a conventional rotation angle detection device and a push switch Side view

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

(Embodiment 1)
The first aspect of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a cross-sectional view of a rotation angle detection device according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, in which 11 is an insulating surface such as a polybutylene terephthalate having a top opening and a substantially box shape. A resin case 12 is a substantially columnar and rotating body made of insulating resin. A rotating shaft 12A protruding from the lower surface of the rotating body 12 is formed on the inner bottom surface of the case 11 via a substantially cylindrical oil-impregnated metal spacer 13. The rotating body 12 is inserted into the case 11 so as to be rotatable.

  Reference numeral 14 denotes a metal lever such as a steel plate. One end of the lever 14 is fixed to the lower end of the rotating shaft 12A protruding from the lower surface of the case 11 by caulking or the like, and the other end of the lever 14 extends outward from the case 11. I'm out.

  And, 15 is a steel wire or copper alloy spring wound in a coil shape, and the upper end of the slightly twisted spring 15 is locked to the rotating body 12 and the lower end is locked to the inner bottom surface of the case 11, respectively. The rotating body 12 is biased at a predetermined angle by the spring 15, and the lever 14 is held at a predetermined position.

  Further, reference numeral 16 denotes a substantially rectangular parallelepiped magnet such as ferrite or Nd—Fe—B alloy, and the magnet 16 is directed to the left and right, that is, horizontally, with the north and south poles aligned, and the center coincides with the rotation center of the rotating body 12. As described above, it is mounted and fixed on the upper surface of the rotating body 12 by adhesion, insert molding or the like.

  Reference numeral 17 denotes a wiring board such as paper phenol or epoxy containing glass, and a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces by copper foil and the like, and are arranged horizontally on the upper surface of the rotating body 12. The case 11 is housed above.

  Reference numeral 18 denotes an angle sensor. As shown in the partial perspective view of FIG. 3, the magnetic detection elements 18 </ b> A and 18 </ b> B such as a Hall element and a GMR element that detect magnetism perpendicular to the detection surface are rotated by the magnet 16. The angle sensor 18 is formed with a predetermined angular interval, for example, an interval of 90 degrees with respect to the center, and the angle sensor 18 is mounted on the wiring pattern on the lower surface of the wiring substrate 17 directly above the magnet 16 by soldering or the like. And are arranged opposite each other with a predetermined gap.

  Further, reference numeral 19 denotes a control circuit mounted on the wiring board 17. As shown in the block circuit diagram of FIG. 4, a control unit 19A such as a microcomputer, an arithmetic unit 19B such as an operational amplifier and a comparator, a fixed or variable resistor, etc. The calculation unit 19B is connected to the magnetic detection elements 18A and 18B, and the calculation unit 19B and the setting unit 19C are connected to the control unit 19A.

  Reference numeral 20 is a switching circuit such as a contact type relay or a semiconductor relay using GaN, SiC, or the like, 21 is a protection circuit such as a varistor or a Zener diode, and the switching circuit 20 is connected to the control unit 19A and protected. A circuit 21 is connected to the angle sensor 18.

  22 is a substantially L-shaped terminal made of copper alloy or the like, and is implanted in the side surface of the case 11 by insert molding or the like, and one end of the plurality of terminals 22 is connected to the wiring pattern, and the terminals 22A and 22B are protection circuits. 21, the terminal 22C is connected to the control unit 19A, the terminal 22D is connected to the switching circuit 20, and the other end of the terminal 22 extends into the connector unit 11A having a substantially rectangular tube shape.

  Further, reference numeral 23 denotes a cover such as an iron plate. The cover 23 covers the upper surface opening of the case 11 and is fixed to the upper surface of the case 11 by caulking or the like, so that the rotation angle detection device 25 is configured.

  As shown in the side view of FIG. 5, the rotation angle detection device 25 configured as described above has a lever 14 mounted on an arm 31A in the vicinity of the rotation shaft of the brake pedal 31 of the automobile, and a plurality of The terminal 22 is connected to a connector or a lead wire (not shown), the terminals 22A and 22B are connected to a power source and ground such as a battery, the terminal 22C is connected to an electronic circuit of the vehicle, and the terminal 22D is connected to a stop lamp (not shown). Connected and mounted on the car.

  As shown in FIG. 5, when the brake pedal 31 is not depressed and the push rod 33 protruding from the cylinder body 32 is extended, the open / close circuit 20 connected to the stop lamp via the terminal 22D is electrically connected. Since it is in a disconnected state, the stop lamp is turned off.

  In the above configuration, when the brake pedal 31 is depressed, the lever 14 swings as the brake pedal 31 rotates, and the rotating body 12 rotates to a predetermined angle, for example, around 50 degrees while twisting the spring 15. Since the magnet 16 mounted at the center of rotation also rotates, the direction of the magnetic field of the magnet 16 changes, and this is detected by the magnetic detection elements 18A and 18B arranged to face each other directly above the magnet 16.

  For example, a sine wave detection signal L1 as shown in the waveform diagram of FIG. 6A is arranged from the magnetic detection element 18A facing the magnet 16 at a 90-degree interval from the magnetic detection element 18A. A detection signal M1 of a cosine wave is output from the detection element 18B to the calculation unit 19B of the control circuit 19, respectively.

  Further, the calculation unit 19B adds or subtracts the detection signal L1 and the detection signal M1, and subtracts the detection signal L1 from the detection signal M1 and adds the calculation signal N1 as shown in FIG. 6B, for example. The calculation signal P1 is calculated respectively, and the control unit 19A calculates the rotation angle of the rotating body 12, that is, the depression amount of the brake pedal 31, from the calculation signals N1 and P1, and outputs this angle signal to the electronic circuit of the automobile body. Then, various controls of the vehicle are performed according to the depression amount.

  At this time, for example, the calculation signal N1 or P1 calculated by adding or subtracting the detection signals L1 and M1 is the angle at which the brake pedal 31 is actually depressed and the rotating body 12 rotates. Since the angle changes approximately linearly between 0 and 60 degrees, a highly accurate rotation angle can be detected between these angles.

  At this time, when the brake pedal 31 is slightly depressed and the rotating body 12 is rotated by a predetermined angle, for example, about 3 to 10 degrees, the control circuit 19 detects the rotation angle, and the control circuit 19A detects the rotation circuit 20. A predetermined switching signal is output to the switching circuit 20, and the switching circuit 20 is electrically connected by this switching signal, and the stop lamp is turned on.

  When the foot is released from the brake pedal 31, the brake pedal 31 returns to its original position, and the rotating body 12 is biased to a predetermined angle by the spring 15 mounted between the rotating body 12 and the case 11, so that the lever 14 returns to the original position, a switching signal is output from the control unit 19A, the open / close circuit 20 is disconnected, and the stop lamp is turned off.

  That is, the control circuit 19 detects the rotation angle of the rotating body 12, that is, the depression amount of the brake pedal 31, from the change in magnetism detected by the magnetism detection elements 18A and 18B, and outputs this to the electronic circuit as an angle signal. At the same time, a switching signal is output in accordance with the depression amount of the brake pedal 31 to electrically connect / disconnect the open / close circuit 20, thereby turning off the stop lamp.

  That is, the control circuit 19 outputs the rotation angle of the rotating body 12 to the electronic circuit as an angle signal in accordance with the magnetism from the magnetic detection elements 18A and 18B, thereby performing various controls of the vehicle and switching signals. By outputting to the switching circuit 20, the stop lamp is turned off and on.

  Therefore, there is no need to provide other parts such as a push switch for turning off the stop lamp, and the amount of depression of the brake pedal 31 can be achieved with only one rotation angle detection device 25 mounted near the rotation axis of the brake pedal 31. Since the stop lamp can be turned off and turned off, the number of components used is small, and the configuration can be simplified and inexpensive, and the brake pedal 31 can be easily mounted in a short time. it can.

  Further, a plurality of magnetic detection elements 18A and 18B are arranged opposite to each other at a predetermined angular interval with respect to the rotation center of the magnet 16 attached to the rotating body 12, and the control circuit 19 receives a plurality of magnetic detection elements 18A and 18B from the magnetic detection elements 18A and 18B. The detection signal L1 and M1 are added or subtracted, and the control circuit 19 detects the rotation angle of the rotating body 12 by using the substantially linear calculation signal N1 or P1 between about 0 to 60 degrees, so that an error is generated. There are few, and it is comprised so that a highly accurate rotation angle can be detected.

  As described above, according to the present embodiment, the plurality of magnetic detection elements 18A and 18B are arranged to face each other at a predetermined angular interval with respect to the rotation center of the magnet 16 attached to the rotating body 12, and the plurality of control circuits 19 are provided. By adding or subtracting the detection signals L1 and M1 from the magnetic detection elements 18A and 18B and detecting the rotation angle of the rotating body 12 from the calculation signals N1 and P1, it is possible to detect the rotation angle with high accuracy and push Since no other parts such as a switch are required, it can be easily mounted on a brake pedal, etc., and with a simple configuration, a rotation angle that can reliably detect the rotation angle and turn off the stop lamp, etc. A detection device can be obtained.

(Embodiment 2)
A second embodiment of the present invention, particularly the invention according to claim 2 will be described.

  The configuration of the rotation angle detection device is the same as that of the first embodiment shown in FIGS. 1 to 3 except for a part of the configuration of the control circuit 19, and thus the description thereof is omitted.

  FIG. 7 is a block circuit diagram of a rotation angle detection device according to the second embodiment of the present invention. In FIG. 7, the setting unit 19C of the control circuit 19 is connected to the control unit 19A, and the terminal 22A Similarly to the first embodiment, 22B is connected to the protection circuit 21, the terminal 22C is connected to the control unit 19A, and the terminal 22D is connected to the switching circuit 20.

  Further, the calculation unit 19B is connected to the magnetic detection elements 18A and 18B as in the first embodiment, but another calculation unit 19D is connected to the magnetic detection elements 18A and 18B. Yes.

  Further, the arithmetic units 19B and 19D are connected to the arithmetic unit 19E, and the arithmetic unit 19E is connected to the control unit 19A to form a control circuit 19. The control circuit 19, the angle sensor 18 and the like are shown in FIG. As shown in FIG. 3, it is mounted on the wiring board 17 directly above the magnet 16 mounted and fixed at the rotation center of the rotating body 12, and the magnetic detection elements 18A and 18B are arranged to face the magnet 16 with a predetermined gap therebetween. Thus, the rotation angle detection device 25 is configured.

  As shown in the side view of FIG. 5, the rotation angle detection device 25 configured as described above has a lever 14 mounted on an arm 31 </ b> A in the vicinity of the rotation axis of the brake pedal 31 of the automobile, and a plurality of The terminal 22 is connected to a power source, a ground, a vehicle electronic circuit, a stop lamp (not shown), and the like by a connector, a lead wire (not shown), etc. Same as the case.

  In the above configuration, when the brake pedal 31 is depressed, the lever 14 swings as the brake pedal 31 rotates, and the rotating body 12 rotates to a predetermined angle, for example, around 50 degrees while twisting the spring 15. Since the magnet 16 mounted at the center of rotation also rotates, the direction of the magnetic field of the magnet 16 changes, and this is detected by the magnetic detection elements 18A and 18B arranged to face each other directly above the magnet 16.

  For example, from the magnetic detection element 18A facing the magnet 16, a detection signal L1 of a sine wave as shown in the waveform diagram of FIG. 8A is sent to the arithmetic unit 19B of the control circuit 19 and the magnetic detection element 18A. From the magnetic detection elements 18B arranged at intervals of 90 degrees, detection signals M1 of cosine waves as shown in FIG. 8B are output to the calculation unit 19D.

  However, at this time, when the ambient temperature in which the rotation angle detection device 25 is used is not a normal temperature but extremely high or low, for example, when the temperature is high, output from the magnetic detection elements 18A and 18B. The detected signal changes like the detection signals L2 and M2, and these are output to the arithmetic units 19B and 19D.

  Accordingly, when the calculation units 19B and 19D add or subtract the detection signals L2 and M2, the detection is performed from the detection signal M1 having no error at room temperature as shown in the waveform diagrams of FIGS. 9A and 9B, for example. The calculation signal N2 or P2 having a deviation from the calculation signal N1 obtained by subtracting the signal L1 or the addition calculation signal P1 is generated.

  However, in the present embodiment, the calculation signals N2 and P2 are not output as they are to the control unit 19A, but are output from the calculation units 19B and 19D to the calculation unit 19E, and these are divided by the calculation unit 19E. .

  That is, for example, as shown in FIG. 9C, the calculation signal R1 obtained by dividing the calculation signal N2 obtained by subtracting the detection signal L2 from the detection signal M2 by the added calculation signal P2 is output from the calculation unit 19E to the control unit 19A. Then, the control unit 19A calculates the rotation angle of the rotating body 12, that is, the depression amount of the brake pedal 31, from this calculation signal R1, and this angle signal is output to the electronic circuit of the automobile body, so that the vehicle according to the depression amount is calculated. Various controls are performed.

  That is, even when the ambient temperature changes and the detection signals output from the magnetic detection elements 18A and 18B change like the detection signals L2 and M2, these are added and subtracted by the arithmetic units 19B and 19D, Further, this is divided by the arithmetic unit 19E to calculate the arithmetic signal R1, and although it is slightly inferior to the linearity of the arithmetic signals N1 and P1, the arithmetic signal R1 that is nearly linear is used between 0 and 90 degrees. The control unit 19A is configured to detect the rotation angle so that highly accurate detection without error can be performed.

  When the brake pedal 31 is slightly depressed and the rotator 12 is rotated at a predetermined angle, for example, about 3 to 10 degrees, the control circuit 19 detects the rotation angle, and the control unit 19A sends the predetermined value to the opening / closing circuit 20. The switching signal is output, and the switching circuit 20 is electrically connected by this switching signal, and when the stop lamp is turned on or the foot is released from the brake pedal 31, the switching circuit 20 It is the same as in the case of the first embodiment that the stop lamp is turned off by being cut.

  In the above description, the configuration in which the magnet 16 having the substantially rectangular parallelepiped shape and the N-pole and the S-pole formed in the horizontal direction is mounted and fixed on the upper surface of the rotating body 12 is described. However, the configuration using a substantially cylindrical magnet. Alternatively, the present invention can also be implemented with a configuration in which the N pole and the S pole are formed in the vertical direction.

  In addition, the configuration in which the magnetic detection elements 18A and 18B such as a Hall element and a GMR element for detecting magnetism in the vertical direction are arranged to face the magnet 16 at an interval of 90 degrees has been described, but a horizontal arrangement at an interval of 45 degrees has been described. A configuration in which the rotation angle of the rotating body 12 is detected by using an AMR (anisotropic magnetoresistive) element that detects directional magnetism may be adopted.

  Further, in addition to the magnetic detection elements 18A and 18B arranged at an angular interval of 90 degrees, two other magnetic detection elements are provided so as to face each other, that is, four magnetic detection elements are arranged with respect to the rotation center of the magnet 16. With a configuration that is arranged at an angular interval of 90 degrees, even when detection signals L2 and M2 having errors as shown in FIG. 8 are output by magnetism from the outside, high-accuracy and reliable rotation Angle detection can be performed.

  That is, the control circuit 19 subtracts the detection signals from the pair of opposing magnetic detection elements, for example, from the detection signal of the magnetic detection element 18A, subtracts the detection signal from the opposite magnetic detection element. By subtracting the detection signal from the magnetic detection element facing the magnetic detection element 18B from the detection signal of the magnetic detection element 18B, these errors are canceled out, so that it is possible to detect the rotation angle with high accuracy without error. become able to.

  In addition, by arranging the four magnetic detection elements at an angular interval of 90 degrees with respect to the rotation center of the magnet 16 in this way, even when a positional deviation in the vertical or horizontal direction occurs in these magnetic detection elements. Since the control circuit 19 can detect such a positional shift depending on the strength of the detected magnetism, it is possible to correct this and detect the rotation angle without error.

(Embodiment 3)
The third and fourth embodiments of the present invention will be described with reference to the third embodiment.

  FIG. 10 is a cross-sectional view of the rotation angle detection device 65, and FIG. 11 is an exploded perspective view of the rotation angle detection device 65.

  Here, the rotation angle detection device 65 is mainly different from the rotation angle detection device 25 in the following points.

  First, instead of the rotating body 12, a main rotating body 51 and a sub rotating body 52 that rotates in conjunction with the main rotating body 51 are provided. Further, a main magnet 53 and a sub magnet 54 are provided instead of the magnet 16. Further, a main angle sensor 55 and a sub-angle sensor 56 are provided in place of the angle sensor 18. A terminal 58 is provided instead of the terminal 22.

  The rotation angle detection device 65 can detect the rotation angle of the main rotating body 51 with the main angle sensor 55 and the sub angle sensor 56, so even if either the main angle sensor 55 or the sub angle sensor 56 fails, the angle signal There is an advantage that one of the output and the stop lamp lighting control can be correctly performed.

  Next, each component will be described.

  Here, the main rotating body 51 is a gear and has teeth with a predetermined pitch on the outer edge, and the sub-rotating body 52 is also a gear, and the outer edge is provided with teeth at a pitch substantially equal to the main rotating body 51. The main rotating body 51 and the sub-rotating body 52 are rotated by meshing with each other, and the diameter of the sub-rotating body 52 is smaller than the diameter of the main rotating body 51. Therefore, when the main rotator 51 and the sub rotator 52 rotate in conjunction with each other, the rotation speed of the sub rotator 52 is larger than the rotation speed of the main rotator 51.

  The main magnet 53 and the sub magnet 54 are substantially rectangular parallelepiped and are made of ferrite, Nd—Fe—B alloy, or the like. Here, the main magnet 53 is disposed at the center of rotation of the main rotor 51, the sub magnet 54 is disposed at the center of rotation of the sub rotor 52, and the main magnet 53 and the sub magnet 54 have S poles and N in the horizontal plane direction. With poles. For example, the right end is the S pole and the left end is the N pole. The main magnet 53 and the sub magnet 54 rotate with the rotation of the main rotor 51 and the sub rotor 52, respectively.

  The main angle sensor 55 is disposed to face the main magnet 53 with a predetermined gap, and the sub-angle sensor 56 is disposed to face the sub-magnet 54 with a predetermined gap. Here, in the main angle sensor 55, main magnetic detection elements 55 A and 55 B such as Hall elements or GMR elements that detect magnetism in a direction perpendicular to the detection surface are at a predetermined angle with respect to the rotation center of the main magnet 53. It arrange | positions at intervals, for example, 90 degree intervals. Similarly, in the sub-angle sensor 56, sub-magnetic detection elements 56A and 56B are arranged at a predetermined angular interval, for example, an interval of 90 degrees.

  Next, the configuration of the built-in circuit 66 will be described with reference to FIG.

  In the figure, the built-in circuit 66 includes a main angle sensor 55, a sub-angle sensor 56, a control circuit 19, an opening / closing circuit 20, a protection circuit 21, and terminals 58 </ b> A to 58 </ b> F serving as one ends of the terminals 58. Yes.

  Here, the setting unit 19C of the control circuit 19 is connected to the control unit 19A, the terminals 58A, 58B, and 58F are connected to the protection circuit 21, the terminal 58C is connected to the control unit 19A, and the terminal 58D is connected to the switching circuit 20. The terminal 58E is not connected.

  The protection circuit 21 is connected to the main angle sensor 55 and the sub angle sensor 56, and supplies power to the main angle sensor 55 and the sub angle sensor 56. Here, the terminal 58A is connected to an electronic circuit having a voltage of 5V of the vehicle, the terminal 58B is connected to a battery having a voltage of 12V, and the terminal 58F is connected to a ground potential. As a result, the main angle sensor 55 is supplied with a voltage of 5 V, and the sub-angle sensor 56 is supplied with 12 V.

  The main angle sensor 55 includes main magnetic detection elements 55A and 55B, and the main magnetic detection elements 55A and 55B are connected to the calculation unit 19B. Here, the detection signals output from the main magnetic detection elements 55A and 55B are input to the calculation unit 19B. The control circuit 19 outputs an angle signal to the terminal 58C based on the detection signal output from the main angle sensor 55. Note that the control circuit 19 may be provided in combination with or in place of the configuration of the second control circuit that divides the detection signal.

  Here, unlike the control circuit 19 of the rotation angle detector 25, the control circuit 19 does not output a switching signal. The other processes of the control circuit 19 are the same as those of the control circuit 19 of the rotation angle detection device 25.

  The sub-angle sensor 56 includes sub-magnetic detection elements 56A and 56B. Further, the auxiliary magnetic detection elements 56A and 56B are connected to the switching circuit 20, and the detection signals output from the auxiliary magnetic detection elements 56A and 56B are input to the switching circuit 20. The open / close circuit 20 switches whether or not it is electrically connected according to the detection signal, and turns on or off the stop lamp.

  The sub-angle sensor 56 operates at a higher voltage than the control circuit 19 and the main angle sensor 55, but the operating current is as small as 300 microA or less, and the stop lamp can be controlled with a small amount of power.

  Further, instead of the built-in circuit 66, a built-in circuit 67 of FIG.

  Here, the configuration of the built-in circuit 67 includes a comparison circuit 57 in comparison with the configuration of the built-in circuit 66, and either the main angle sensor 55 or the sub-angle sensor 56 has failed due to the comparison circuit 57. Can be determined. Unlike the control circuit 19 of the built-in circuit 67, the control circuit 19 of the built-in circuit 67 outputs a switching signal.

  The comparison circuit 57 is connected to the sub-angle sensor 56, the control circuit 19, and the terminal 58E. Here, the switching signal is input from the control circuit 19 to the comparison circuit 57 and the detection signal output from the sub-angle sensor 56 is input.

  The comparison circuit 57 compares the switching signal and the detection signal output from the sub-angle sensor 56, and determines that both the main angle sensor 55 and the sub-angle sensor 56 are normal if they are in a predetermined correspondence relationship.

  On the other hand, if the predetermined correspondence relationship is not satisfied, the comparison circuit 57 determines that either the main angle sensor 55 or the sub angle sensor 56 has failed, and outputs a notification signal from the terminal 58E. Whether or not there is a predetermined correspondence relationship is determined using a predetermined reference value stored in the setting unit 19C of the control circuit 19 of the built-in circuit 67. Alternatively, the comparison circuit 57 may be configured by a logic circuit or the like and determined. The comparison circuit 57 may be built in the control circuit 19.

  Furthermore, in the above description, the angle sensor 18 in which the magnetic detection elements 18A and 18B are integrally formed is used, and the configuration in which the control circuit 19 and the switching circuit 20 are provided on the wiring board 17 on which the angle sensor 18 is mounted has been described. A configuration in which the magnetic detection elements 18A and 18B are directly mounted on the wiring board 17, a configuration in which the control unit 19A performs division instead of the calculation unit 19E, or the wiring board 17 is provided with only the magnetic detection elements 18A and 18B, and is controlled. The present invention can be implemented even if the circuit 19 and the open / close circuit 20 are provided on the electronic circuit side of the vehicle.

  In addition, the configuration in which the rotation angle detection device 25 is used to mainly detect the depression amount of the brake pedal 31 and the stop lamp is turned off / on has been described. In addition to this, various vehicles such as a clutch pedal and an accelerator pedal are used. The present invention can also be implemented with a configuration that detects the operation of the pedal.

  As described above, according to the present embodiment, the control circuit 19 adds and subtracts the detection signals from the plurality of magnetic detection elements 18A and 18B and then divides them to detect the rotation angle of the rotating body 12. With a simple configuration, the rotation angle can be reliably detected and the stop lamp can be turned off / on, etc., and even if an error occurs in the detection signal from the magnetic detection elements 18A and 18B due to a change in ambient temperature, high accuracy is achieved. Thus, a reliable rotation angle can be detected.

  Further, since the main rotating body 51 and the sub rotating body 52, the main magnet 53 and the sub magnet 54, and the main angle sensor 55 and the sub angle sensor 56 are provided, either the main angle sensor 55 or the sub angle sensor 56 is provided. Even if a failure occurs, one of angle signal output and stop lamp lighting control can be performed correctly.

  Further, the control circuit 19 further includes a comparison circuit 57 connected to the sub-angle sensor 56. The comparison circuit 57 compares the switching signal input from the control circuit 19 with the detection signal input from the sub-angle sensor 56, Since it is configured to output a notification signal when it is out of the predetermined correspondence relationship, it can be determined that either the main angle sensor 55 or the sub-angle sensor 56 has failed.

  The rotation angle detection device according to the present invention has an advantageous effect that it is possible to obtain a device that can detect a reliable rotation angle and can turn off / off a stop lamp with a simple configuration. This is useful for operating pedals and the like.

DESCRIPTION OF SYMBOLS 11 Case 11A Connector part 12 Rotating body 12A Rotating shaft 13 Spacer 14 Lever 15 Spring 15 Magnet 17 Wiring board 18 Angle sensor 18A, 18B Magnetic detection element 19 Control circuit 19A Control part 19B, 19D, 19E Calculation part 19C Setting part 20 Opening / closing circuit DESCRIPTION OF SYMBOLS 21 Protection circuit 22,22A, 22B, 22C, 22D, 58,58A-58F Terminal 23 Cover 25,65 Rotation angle detection apparatus 31 Brake pedal 31A Arm 32 Cylinder body 33 Push rod 51 Main rotating body 52 Subrotating body 53 Main magnet 54 Sub magnet 55 Main angle sensor 55A, 55B Main magnetic detection element 56 Sub angle sensor 56A, 56B Sub magnetic detection element 66, 67 Built-in circuit

Claims (4)

A rotating body that rotates in accordance with the rotation of the pedal, a magnet that is mounted at the rotation center of the rotating body, and a magnet that is disposed to face the magnet with a predetermined gap and is spaced at a predetermined angular interval with respect to the rotation center of the magnet. Rotation angle detection comprising: a plurality of magnetic detection elements arranged and outputting detection signals; and a control circuit connected to the plurality of magnetic detection elements and adding or subtracting the detection signals to detect the rotation angle of the rotating body apparatus. The rotation angle detection device according to claim 1, wherein the control circuit adds and subtracts detection signals from the plurality of magnetic detection elements, and then divides the detection signals to detect the rotation angle of the rotating body. The rotating body includes a main rotating body and a sub-rotating body that rotates in conjunction with the main rotating body, and the magnet includes a main magnet disposed at a rotation center of the main rotating body and a rotation center of the sub-rotating body. The magnetic detection element is arranged to face the main magnet detection element with a predetermined gap and the sub magnet arranged to face the sub magnet with a predetermined gap. The rotation angle detection according to claim 1, further comprising: an opening / closing circuit that is configured by a magnetic detection element and that is connected to the secondary magnetic detection element and electrically contacts and separates according to a detection signal input from the secondary magnetic detection element. apparatus. The rotating body is composed of a main rotating body and a sub-rotating body that rotates in conjunction with the main rotating body, and the magnet is located at a rotating center of the main rotating body and the auxiliary rotating body. A sub-magnet disposed between the main magnet and the sub-magnet, the sub-magnet being opposed to the sub-magnet with a predetermined gap. A switching element input from the control circuit connected to the control circuit and the auxiliary magnetic detection element and a detection signal input from the auxiliary magnetic detection element, and deviating from a predetermined correspondence relationship. The rotation angle detection device according to claim 1, further comprising a comparison circuit that outputs a notification signal when the information is present.

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