JP2012118048A - Rotation angle detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation angle detection device mainly used for rotation angle detection of a brake pedal of a vehicle or the like, which can securely detect a rotation angle and light on and off a stop lamp and the like, with a simple structure.SOLUTION: A rotation angle detection device 27 comprises: multiple magnetic detection elements 18A and 18B provided facing each other at predetermined angle intervals relative to a rotation center of a magnet 16; a first control circuit 19 for performing addition or subtraction of detection signals L1 and L2 from the magnetic detection elements 18A and 18B to detect a rotation angle; a second control circuit 21 which performs division of the detection signals L1 and L2 and after that converts the result to an inverse function to detect the rotation angle of a rotor 12; and a switching circuit 24 for switching which of the first control circuit 19 and the second control circuit 21 is made in operation, according to applied voltage. Thus, the rotation angle detection device 27 which has a simple structure and can securely detect the rotation angle and light on and off a stop lamp and the like can be obtained.

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. 12A is a perspective view of a conventional rotation angle detection device, in which a rotating body 2 is rotatably housed in a substantially box-shaped case 1 made of insulating resin, and the rotating body 2 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. 12B is a perspective view of a conventional push switch. In FIG. 12B, an operating 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. 13, 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, for example, an electronic circuit (not shown) having a voltage of 5 V, for example, by a lead wire or a connector (not shown).

  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 the vehicle, for example, a 12V battery or a stop lamp by a lead wire or a connector. (Not shown) or the like.

  That is, as shown in FIG. 13, 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 and operated while bending the spring. 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 has become.

  At this time, for example, in a state where an ignition switch (not shown) or the like is turned on and the engine is started, for example, a voltage 5V is applied from the electronic circuit of the vehicle to the rotation angle detection device 5, thereby rotating the rotating body as described above. 2 is detected, but when the engine is stopped, no voltage is supplied from the electronic circuit to the rotation angle detection device 5, and therefore the depression amount is not detected even if the brake pedal 31 is operated.

  On the other hand, since the push switch 10 is connected to the vehicle battery and the voltage 12 V is supplied from the battery even when the engine is stopped, the stop lamp is lit when the brake pedal 31 is operated even when the engine is stopped. 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, the present invention particularly rotates by adding or subtracting detection signals from a plurality of magnetic detection elements arranged opposite to each other at a predetermined angular interval with respect to a rotation center of a magnet mounted on a rotating body. A first control circuit for detecting the rotation angle of the body, a second control circuit for detecting the rotation angle of the rotating body by dividing the detection signals from the plurality of magnetic detection elements and then converting them to an inverse function; The rotation angle detection device is configured to include a switching circuit that switches which one of the first control circuit and the second control circuit is operated according to the applied voltage.

  According to the present invention, the rotation angle of the rotating body is detected by adding or subtracting detection signals from a plurality of magnetic detection elements arranged to face the rotation center of the magnet mounted on the rotating body at a predetermined angular interval. A first control circuit, a second control circuit that divides detection signals from a plurality of magnetic detection elements and then converts the detection signals into an inverse function to detect the rotation angle of the rotating body; and a first control circuit according to an applied voltage. A switching circuit for switching which one of the one control circuit and the second control circuit is operated is provided.

  As a result, the switching circuit can be switched to the second control circuit having a relatively large current when the engine is started, and the rotation angle can be detected with high accuracy using the voltage from the electronic circuit of the vehicle. Further, when the voltage from the battery when the engine is stopped is used, the switching circuit is switched to the first control circuit, and the rotation angle can be detected by the first control circuit having a small current. In other words, it is possible to reliably detect the rotation angle by preventing the battery from being consumed, and the contact / separation signal for turning off / on the stop lamp can also be output from the first control circuit or the second control circuit. No other parts are required, and a rotation angle detection device that can be easily mounted on a brake pedal or the like with a simple configuration and can reliably detect the rotation angle and turn off the stop lamp is obtained. be able to.

Sectional drawing of the rotation angle detection apparatus by one embodiment of this invention Exploded perspective view Partial perspective view Same block circuit diagram Side view Waveform diagram Waveform diagram Sectional drawing of the rotation angle detection apparatus by other 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)
FIG. 1 is a cross-sectional view of a rotation angle detecting device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and 11 is an insulating resin such as polybutylene terephthalate having a top opening and a substantially box shape. The case 12 has a substantially cylindrical shape and is also made of an insulating resin, and a rotating shaft 12A protruding from the lower surface of the rotating body 12 is inserted into the bottom surface of the case 11 through a substantially cylindrical oil-impregnated metal spacer 13. The rotating body 12 is accommodated in 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.

  Reference numeral 19 denotes a first control circuit mounted on the wiring board 17, which is formed of a control unit 19A such as an operational amplifier and a comparator, a calculation unit 19B and a setting unit 20, and the calculation unit 19B is a magnetic detection element. A calculation unit 19B and a setting unit 20 are connected to the control unit 19A, respectively, at 18A and 18B.

  Further, 21 is a second control circuit mounted on the wiring board 17, and as shown in the block circuit diagram of FIG. 4, a control unit 21A such as a microcomputer and a conversion unit 21B such as an A / D converter are fixed or variable. A conversion unit 21B is connected to the magnetic detection elements 18A and 18B, and the conversion unit 21B and the setting unit 20 are connected to the control unit 21A, respectively, while being formed from a setting unit 20 such as a resistor or a memory that stores a predetermined reference value. Yes.

  Reference numeral 22 denotes a contact type relay, a switching circuit such as a semiconductor relay using GaN, SiC, or the like, 23 a protection circuit such as a varistor or a Zener diode, 24 a switching circuit such as a relay or FET, and the switching circuit 22 The protection circuit 23 is connected to the angle sensor 18 via the switching circuit 24 while being connected to the control units 21A and 19A.

  25 is a substantially L-shaped terminal made of copper alloy or the like, and is implanted on the side surface of the case 11 by insert molding or the like, and one end of a plurality of terminals 25 is protected by, for example, terminals 25A and 25B via a wiring pattern. Terminals 25C and 25D are connected to the circuit 23, the control units 21A and 19A, a terminal 25E is connected to the switching circuit 22, and the other end of the terminal 25 extends into the connector 11A having a substantially rectangular tube shape.

  Further, reference numeral 26 denotes a cover such as an iron plate. The cover 26 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 to constitute a rotation angle detection device 27.

  As shown in the side view of FIG. 5, the rotation angle detection device 27 configured as described above has a lever 14 mounted on the arm 31 </ b> A in the vicinity of the rotation shaft of the brake pedal 31 of the automobile, and a plurality of The terminal 25 is connected to a connector, a lead wire (not shown), etc., for example, the terminal 25A is an electronic circuit (not shown) of a vehicle voltage 5V, the terminal 25B is a battery of voltage 12V, the terminal 25F is a ground potential, 25C and 25D are connected to an electronic circuit, and a terminal 25E is connected to a stop lamp (not shown) or the like, and is mounted on an automobile.

  As shown in FIG. 5, the open / close circuit 22 connected to the stop lamp via the terminal 25E, in which the push rod 33 protruding from the cylinder body 32 is extended without the brake pedal 31 being depressed, is electrically disconnected. The stop lamp is extinguished because it is in a state.

  At this time, for example, when an ignition switch (not shown) or the like is turned on and the engine of the vehicle is started, a voltage of 5 V is applied to the terminal 25A from the electronic circuit. The state is switched to the control circuit 21 side, and the voltage 5 V is supplied to the second control circuit 21.

  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. The detection element 18B outputs a cosine wave detection signal L2 to the conversion unit 21B of the second control circuit 21. The conversion unit 21B converts the analog detection signals L1 and L2 into digital signals.

  Then, the control unit 21A first divides the digital signal input from the conversion unit 21B, for example, as shown in FIG. 6B by, for example, the detection signal L1 by the detection signal L2, and the tangent wave calculation signal M1 or The detection signal L2 is divided by the detection signal L1, and the calculation signal M2 having a reciprocal number of the calculation signal M1 is calculated.

  Further, thereafter, the control unit 21A converts the calculation signals M1 and M2 into inverse functions, and the linear conversion signals N1 and N2 and the positive and negative of the detection signals L1 and L2 as shown in FIG. 6C. Further, the rotation angle of the rotating body 12, that is, the depression amount of the brake pedal 31 is calculated from the magnitude relationship. The control unit 21A corresponds to the rotation angle of the rotating body 12, and this angle signal is output from the terminal 25C to the electronic circuit of the automobile body, and various control of the vehicle according to the depression amount is performed by this angle signal. .

  At this time, the detection signals L1 and L2 from the magnetic detection elements 18A and 18B are converted into digital signals, and after being divided by the control unit 21A, the conversion signals N1 and N2 converted into inverse functions change linearly. Therefore, the rotation angle can be detected with high accuracy.

  Further, at this time, when the brake pedal 31 is slightly depressed and the rotating body 12 is rotated at a predetermined angle, for example, about 3 to 10 degrees, the second control circuit 21 detects this rotation angle, and from the control unit 21A. A predetermined contact / separation signal is output to the open / close circuit 22, and the open / close circuit 22 is electrically connected by the contact / separation 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 contact / separation signal is output from the control unit 21A, the open / close circuit 22 is disconnected, and the stop lamp is turned off.

  That is, in a state where the engine is started and the switching circuit 24 is switched to the second control circuit 21 side, the second control circuit 21 rotates from the magnetic change of the magnet 16 detected by the magnetic detection elements 18A and 18B. The rotation angle of the body 12, that is, the depression amount of the brake pedal 31, is detected and output to the electronic circuit as an angle signal, and the contact / separation signal is output according to the depression amount of the brake pedal 31, Electrical contact / separation is performed so that the stop lamp is turned off and on.

  At this time, when the conversion unit 21B converts the detection signals L1 and L2 of the magnetic detection elements 18A and 18B into digital signals in the second control circuit 21 to which the voltage 5 V is supplied, a current of about 10 mA is applied. Flowing. Further, after the control unit 21A divides these together with the digital signals to calculate the arithmetic signals M1 and M2, and then converts them into the inverse conversion signals N1 and N2, a relatively large current of about 15 mA flows. In this way, a relatively large current flows through the second control circuit 21, but the rotation angle can be detected with high accuracy by the linear conversion signals N1 and N2.

  On the other hand, for example, when the ignition switch or the like is turned off and the vehicle engine is stopped, the voltage from the electronic circuit is not supplied to the terminal 25A, and the voltage of 12V is supplied from the battery to the terminal 25B. Therefore, the switching circuit 24 detects this and switches to the first control circuit 19 side, and the voltage 12V is supplied to the first control circuit 19.

  Further, even when the brake pedal 31 is depressed with the engine stopped in this manner, the magnetic detection elements 18A and 18B detect a change in the direction of the magnetic field of the magnet 16 accompanying the rotation of the rotating body 12. The detection signal L1 of the sine wave as shown in the waveform diagram of FIG. 7A from the magnetic detection element 18A facing the magnet 16 and the magnetic detection element arranged at an interval of 90 degrees from the magnetic detection element 18A The cosine wave detection signals L <b> 2 from 18 </ b> B are each output to the calculation unit 19 </ b> B of the first control circuit 19.

  Then, the calculation unit 19B adds or subtracts the detection signal L1 and the detection signal L2, and subtracts the detection signal L1 from the detection signal L2 and adds the calculation signal P1 as shown in FIG. 7B, for example. The calculation signal P2 is calculated, 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 P1 and P2, and this angle signal is output from the terminal 25D to the electronic circuit. Then, various controls of the vehicle are performed according to the depression amount.

  At this time, the calculation signals P1 and P2 calculated by adding or subtracting the detection signals L1 and L2, for example, the calculation signal P1 is an 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.

  Further, 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 first control circuit 19 detects the rotation angle, and the control unit 19A detects the rotation circuit 22. A predetermined contact / separation signal is output, and the contact / separation signal causes the switching circuit 22 to be electrically connected, and the stop lamp is lit.

  Further, when the foot is released from the brake pedal 31, the brake pedal 31 returns to the original position, and the rotating body 12 is biased to a predetermined angle by the spring 15, so that the lever 14 returns to the original position, and the control unit 19A. A contact / separation signal is output from, the switching circuit 22 is disconnected, and the stop lamp is turned off.

  That is, when the engine is stopped and the switching circuit 24 is switched to the first control circuit 19 side, the first control circuit 19 rotates from the magnetic change of the magnet 16 detected by the magnetic detection elements 18A and 18B. The rotation angle of the body 12, that is, the depression amount of the brake pedal 31, is detected and output to the electronic circuit as an angle signal, and the contact / separation signal is output according to the depression amount of the brake pedal 31, Electrical contact / separation is performed so that the stop lamp is turned off and on.

  At this time, the rotation angle is detected from the calculation unit 19B of the first control circuit 19 that adds or subtracts the detection signals L1 and L2 from the magnetic detection elements 18A and 18B and the calculated calculation signals P1 and P2. Since only a small current of about 20 μA flows through the control unit 19A, it is possible to reduce battery consumption when the engine is stopped and to detect the rotation angle from the substantially linear calculation signals P1 and P2 so that the brake is actually applied. While the pedal 31 is depressed, the rotation angle can be detected with relatively high accuracy.

  That is, when the engine is started, the switching circuit 24 is switched to the second control circuit 21 side, and the second control circuit 21 having a relatively large current detects the rotation angle with high accuracy. In addition, when the engine is stopped, the switching circuit 24 is switched to the first control circuit 19 side, and the rotation angle is detected by the first control circuit 19 with a small current, thereby preventing the battery from being consumed and ensuring the rotation. An angle can be detected.

  The second control circuit 21 and the first control circuit 19 detect the rotation angle of the rotating body 12, that is, the depression amount of the brake pedal 31, from the change in magnetism of the magnet 16 detected by the magnetic detection elements 18A and 18B. In addition to outputting this as an angle signal to the electronic circuit, a predetermined contact / separation signal is output according to the depression amount of the brake pedal 31 to perform electrical contact / separation of the open / close circuit 22, thereby turning off the stop lamp. It is supposed to be.

  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 27 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 second control circuit 21 and the first control circuit 19 are provided. The detection signals L1 and L2 from the plurality of magnetic detection elements 18A and 18B are calculated or converted, and the rotating body 12 is rotated using the linear conversion signals N1 and N2 or the substantially linear calculation signals P1 and P2. By detecting the angle, there is little error and the rotation angle can be detected with high accuracy.

  Furthermore, a rotation angle detection device 65 according to another embodiment of the present invention will be described.

  FIG. 8 is a cross-sectional view of the rotation angle detection device 65, and FIG. 9 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 27 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 25.

  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, a built-in circuit 66 includes a main angle sensor 55, a sub-angle sensor 56, a first control circuit 191, a setting unit 20, a second control circuit 211, a switching circuit 22, and a protection circuit 23. And the switching circuit 24 and terminals 58A to 58G which are one end of the terminal 58.

  Here, the main angle sensor 55 is connected to the protection circuit 23 via the switching circuit 24. The protection circuit 23 is connected to terminals 58A, 58B, and 58F, the terminal 58A is further connected to an electronic circuit having a voltage of 5V, the terminal 58B is connected to a battery having a voltage of 12V, and the terminal 58F is further connected to a ground potential. The voltage supplied to the main angle sensor 55 is switched by the switching circuit 24 to a voltage of 5V when the engine is on and to a voltage of 12V when the engine is off.

  Here, the first control circuit 191 operates when the engine is off.

  Detection signals output from the main magnetic detection elements 55A and 55B of the main angle sensor 55 are input to the calculation unit 19B. The calculation unit 19B adds or subtracts the detection signal to generate a calculation signal and outputs it to the control unit 19A. The control unit 19A outputs an angle signal to the terminal 58C based on the calculation signal.

  The second control circuit 211 operates when the engine is on.

  Detection signals output from the main magnetic detection elements 55A and 55B of the main angle sensor 55 are input to the conversion unit 21B. Then, the conversion unit 21B converts the detection signal into a digital signal, and the digital signal is input to the control unit 21A. In the control unit 21A, after dividing based on the digital signal, inverse conversion is performed to calculate the rotation angle of the main rotor 51, and the angle signal is output to the terminal 58G.

  The protection circuit 23 is connected to the sub angle sensor 56 together with the main angle sensor 55. Here, the sub-angle sensor 56 is supplied with a voltage of 12V.

  Here, the sub-angle sensor 56 includes sub-magnetic detection elements 56A and 56B. The sub-magnetic detection elements 56A and 56B are connected to the switching circuit 22, and the detection signals output from the sub-magnetic detection elements 56A and 56B are opened and closed. Input to the circuit 22. The open / close circuit 22 is switched by the detection signal to determine whether it is electrically connected, and turns on or off the stop lamp.

  Unlike the first control circuit 19 and the second control circuit 21 of the rotation angle detection device 27, the first control circuit 191 and the second control circuit 211 do not output a switching signal. Other processes of the first control circuit 191 and the second control circuit 211 are the same as those of the first control circuit 19 and the second control circuit 21 of the rotation angle detection device 27.

  Further, instead of the built-in circuit 66, a built-in circuit 67 in 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 first control circuit 191 and the second control circuit 211 of the built-in circuit 66, the first control circuit 192 and the second control circuit 212 of the built-in circuit 67 output switching signals.

  Here, the comparison circuit 57 is connected to the sub-angle sensor 56, the first control circuit 192, the second control circuit 212, and the terminal 58E. The comparison circuit 57 receives the switching signal from the first control circuit 192 or the second control circuit 212 and the detection signal output from the sub-angle sensor 56.

  The comparison circuit 57 compares the switching signal output from the first control circuit 192 or the second control circuit 212 with the detection signal output from the sub-angle sensor 56. It is determined that both the angle sensor 55 and the sub-angle sensor 56 are normal.

  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 a predetermined correspondence relationship exists is determined using a predetermined reference value stored in the setting unit 20. 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 first control circuit 192 or the second control circuit 212, or may be provided on the electronic circuit side of the vehicle.

  In the above description, the angle sensor 18 in which the magnetic detection elements 18A and 18B are integrally formed, or the main angle sensor 55 and the sub-magnetic detection elements 56A and 56B in which the main magnetic detection elements 55A and 55B are integrally formed are integrated. Although it has been described that the formed sub-angle sensor 56 is used, the magnetic detection elements 18A and 18B, the main magnetic detection elements 55A and 55B, and the sub-magnetic detection elements 56A and 56B may be directly mounted on the wiring board 17.

  The wiring board 17 is provided with only the angle sensor 18, the main angle sensor 55, and the sub-angle sensor 56, and the other first control circuits 19, 191 and 192, the open / close circuit 22 and the like are provided on the electronic circuit side of the vehicle. It is good also as a structure.

  Further, the first control circuits 19, 191 and 192, the second control circuits 21, 211 and 212, the open / close circuit 22, the protection circuit 23, and the switching circuit 24 may be formed as an integrated package. Is possible.

  In addition, when the switching circuit 24 is switched to the first control circuit 19 side and the rotation angle is detected using the battery, for example, the switching circuit 24 is switched to 12V and 0V at a predetermined interval. By performing the intermittent operation, it is possible to further reduce battery consumption.

  Moreover, it is good also as a structure which replaces with the calculating part 19B and 19A of control parts perform a division.

  In addition, the configuration in which the rotation angle detection devices 27 and 65 are used to mainly detect the depression amount of the brake pedal 31 and the stop lamp is turned off / on has been described, but there are various other types such as a clutch pedal and an accelerator pedal. The present invention can also be implemented as a configuration for detecting the operation of a pedal of a simple vehicle.

  Further, the present invention can be implemented with a configuration using a substantially cylindrical magnet, or a configuration using a magnet in which the N and S poles 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. It is also possible to use a magnetic detection element such as an AMR (anisotropic magnetoresistive) element that detects the direction magnetism, and thereby detect the rotation angle of the rotating body 12.

  As described above, according to the present embodiment, the 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, and the detection signal L1 from the magnetic detection elements 18A and 18B A first control circuit 19 that detects the rotation angle by adding or subtracting L2, and a second control circuit that detects the rotation angle of the rotating body 12 by dividing the detection signals L1 and L2 and then converting them to an inverse function. 21 and a switching circuit 24 for switching which of the first control circuit 19 and the second control circuit 21 is operated according to the applied voltage, thereby preventing the battery from being consumed and reliably detecting the rotation angle. Rotation angle detection device that can be easily mounted on the brake pedal 31 and the like with a simple configuration and that can reliably detect the rotation angle and turn off the stop lamp. 7 are those that can be obtained.

  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 16 Magnet 17 Wiring board 18 Angle sensor 18A, 18B Magnetic detection element 19, 191, 192 First control circuit 19A Control part 19B Calculation part 20 Setting part 21, 211, 212 Second control circuit 21A Control unit 21B Conversion unit 22 Open / close circuit 23 Protection circuit 24 Switching circuit 25, 25A, 25B, 25C, 25D, 25E, 25F, 58, 58A, 58B, 58C, 58D, 58E , 58F, 58G Terminal 26 Cover 27, 65 Rotation angle detector 31 Brake pedal 31A Arm 32 Cylinder body 33 Push rod 51 Main rotator 52 Sub rotator 53 Main magnet 54 Sub magnet 55 Main angle sensor 55A, 55B Main magnetic sensor 56 Angle sensors 56A, 56B secondary magnetic detection elements 66 and 67 built-in circuit

Claims (3)

A rotating body that rotates with the rotation of the pedal, a magnet that is mounted at the rotation center of the rotating body, and a detection signal that is arranged opposite to the rotation center of the magnet with a predetermined gap at a predetermined angular interval. A plurality of magnetic detection elements to output, a first control circuit for detecting the rotation angle of the rotating body by adding or subtracting detection signals from the plurality of magnetic detection elements, and detection from the plurality of magnetic detection elements After the signal is divided, the second control circuit that detects the rotation angle of the rotating body by converting it into an inverse function, and the first control circuit according to the applied voltage, the second control circuit A rotation angle detection device having a switching circuit for switching between operation and operation. 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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