JP2013088154A - Rotation angle detection device and rotation angle detection system using the same - Google Patents

Abstract

[PROBLEMS] To provide a rotation angle detection device mainly used for detection of a rotation angle of a steering of an automobile and a rotation angle detection system using the rotation angle detection device, which can detect a rotation angle with a simple configuration. For the purpose.
When the control means 12 and 12A of the rotation angle detectors 13 and 13A output the calculated rotation angles after different predetermined times, and connect them to detect rotation angles from the other, By forming so as not to output the rotation angle, even when a plurality of rotation angle detection devices 13 and 13A are used, only one rotation angle signal is input to the electronic circuit 11 of the vehicle. In the unlikely event that a failure or the like occurs on one side, the rotation angle is output from the other, so that a device that can reliably detect the rotation angle can be obtained with a simple configuration.
[Selection] Figure 1

Description

  The present invention relates to a rotation angle detection device mainly used for detecting a rotation angle of a steering wheel of an automobile, and a rotation angle detection system using the rotation angle detection device.

  In recent years, as the functions of automobiles have advanced, the number of steering angle detection devices that use various rotation angle detection devices to control various types of vehicles using this has increased.

  Such a conventional rotation angle detection device and a rotation angle detection system using the same will be described with reference to FIGS.

  FIG. 3 is a block circuit diagram of a conventional rotation angle detection system. FIG. 4 is a perspective view of the rotation angle detection device. In FIG. 3, reference numeral 1 denotes a rotating body having a spur gear formed on the outer periphery. A pair of protrusions that engage with a shaft of a steering (not shown) to be inserted is provided.

  2 is a first detector having a spur gear formed on the outer periphery, 3 is a second detector having a spur gear having a different number of teeth from the first detector 2 on the outer periphery, The spur gears of the detection body 2 and the second detection body 3 are respectively meshed with the spur gear of the rotating body 1.

  Reference numeral 4 denotes a wiring board disposed substantially in parallel above the first detection body 2 and the second detection body 3, and a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces. Magnetic detecting elements 7 and 8 are mounted on the opposing surfaces of the magnet 5 mounted at the center of one detection body 2 and the magnet 6 mounted at the center of the second detection body 3, respectively.

  The first detection means is formed by the magnet 5 and the magnetic detection element 7 opposed to each other, and the second detection means is formed by the magnet 6 and the magnetic detection element 8, respectively. The control means 9 connected to the magnetic detection elements 7 and 8 through the wiring pattern is formed by these electronic components.

  Further, the rotating body 1, the first detecting body 2, and the second detecting body 3 are rotatably held on the bottom surface of a lower case (not shown) made of an insulating resin, and the upper surfaces thereof are made of an insulating resin. An upper case (not shown) covers the rotation angle detection device 10.

  In FIG. 3, 10A is a rotation angle detection device formed in the same manner as the rotation angle detection device 10, and the spur gear of the first detection body 2A and the second detection body 3A is replaced with the spur gear of the rotation body 1A. The control means 9A is connected to the magnetic detection elements 7A and 8A that are engaged with each other and are opposed to the magnet (not shown) at the center of the first detection body 2A and the second detection body 3A.

  The rotation angle detection devices 10 and 10A thus configured are arranged vertically, the steering shaft is inserted into the inner periphery of the rotating bodies 1 and 1A, and mounted on the automobile, and the control means 9 and 9A are connected to the connector. And a lead wire (not shown), etc., are connected to the electronic circuit 11 of the vehicle to constitute a rotation angle detection system.

  In the above configuration, when the steering is rotated, the rotating body 1 is rotated, and the first detecting body 2 and the second detecting body 3 are rotated in conjunction therewith. 6 and 6 are also rotated, and the magnetic detecting elements 7 and 8 detect the changing magnetic force of the magnets 5 and 6, and a sine wave, cosine wave, or a substantially sawtooth detection signal that repeatedly increases and decreases is input to the control means 9. The

  At this time, since the first detector 2 and the second detector 3 are different in the number of teeth of the spur gear, the data waveforms output from the magnetic detection elements 7 and 8 have different shapes and phase differences. It becomes a certain detection signal.

  Then, from the two different detection signals from the first detection body 2 and the second detection body 3 and the number of teeth of each spur gear, the control means 9 performs a predetermined calculation to determine the rotation body 1, that is, the steering wheel. While calculating a rotation angle, this rotation angle and the identification number intrinsic | native to the rotation angle detection apparatus 10 are output to the electronic circuit 11 of a motor vehicle main body.

  At this time, the rotating body 1A is also rotated at the same time, and the first detecting body 2A and the second detecting body 3A are also rotated in conjunction with this, so that the detection signals are also controlled by the magnetic detecting elements 7A and 8A. 9A, the control means 9A calculates the rotation angle of the rotating body 1A, and the rotation angle of the rotating body 1A equivalent to the rotating body 1 and the identification number unique to the rotation angle detecting device 10A are the control means 9A. To the electronic circuit 11.

  That is, a plurality of signals having the same rotation angle of the rotating bodies 1 and 1A and different identification numbers for the rotation angle detection devices 10 and 10A are input to the electronic circuit 11 from the control means 9 and 9A. The electronic circuit 11 discriminates an identification number that is different for each device, and normally performs various controls of the vehicle, for example, a power steering device and a brake device, using only one of the rotation angles from the control means 9, for example.

  However, in the unlikely event that a failure or the like occurs in one of the rotation angle detection devices 10 and 10A and the rotation angle and the identification number are input only from one of the control means 9 or 9A, for example, the control means 9 When no signal is input and a signal is input only from the control means 9A, the electronic circuit 11 determines this identification number and performs various controls of the vehicle using the rotation angle from the control means 9A. .

  That is, by using a plurality of rotation angle detection devices 10 and 10A and outputting the rotation angle and the identification number from these control means 9 and 9A to the electronic circuit 11, respectively, even if a failure or the like occurs by any chance The vehicle is configured so as not to hinder various controls of the vehicle.

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

JP 2010-38682 A

  However, in the conventional rotation angle detection device and the rotation angle detection system using the same, the rotation angle and the identification number are output from the plurality of control means 9 and 9A to the electronic circuit 11, respectively. Since various types of vehicle control are performed by discriminating, various signals are actually input from many sensors such as brakes and accelerators in addition to the rotation angle detection device, and these calculations and processes are performed. There is a problem that the load on the electronic circuit 11 is increased and becomes complicated.

  The present invention solves such a conventional problem, and provides a rotation angle detection device capable of reliably detecting a rotation angle with a simple configuration, and a rotation angle detection system using the rotation angle detection device. Objective.

  In order to achieve the above object, according to the present invention, the control means of the rotation angle detection device outputs a rotation angle calculated by a detection signal from the detection means after a predetermined time, and outputs a plurality of rotations with different time for outputting the rotation angle. When the control means of the angle detection device is connected and the rotation angle from another rotation angle detection device is detected, the control means does not output the rotation angle, and the rotation angle detection system is configured. Even when the rotation angle detection device is used, only one rotation angle signal is input to the electronic circuit of the vehicle, so the load on the electronic circuit is reduced, and even if a failure or the like occurs in one, Since a rotation angle is output from the rotation angle, a rotation angle detection device capable of reliably detecting the rotation angle with a simple configuration, and a rotation angle detection system using the rotation angle detection device can be obtained. It is those having the effect that.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to realize a rotation angle detection device capable of reliably detecting a rotation angle and a rotation angle detection system using the rotation angle detection device with a simple configuration.

1 is a block circuit diagram of a rotation angle detection system according to an embodiment of the present invention. Perspective view of the rotation angle detector Block circuit diagram of a conventional rotation angle detection system Perspective view of the rotation angle detector

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of background art, and detailed description is simplified.

(Embodiment)
FIG. 1 is a block circuit diagram of a rotation angle detection system according to an embodiment of the present invention, FIG. 2 is a perspective view of the rotation angle detection device, and in FIG. 1, 1 is a rotating body made of insulating resin or metal, A spur gear is formed on the outer periphery, and a pair of protrusions that engage with a shaft of a steering (not shown) to be inserted is provided on the inner periphery.

  In addition, 2 is a first detection body made of insulating resin or metal, 3 is also a second detection body, and the spur gear on the outer periphery of the first detection body 2 meshes with the spur gear on the outer periphery of the rotating body 1. A spur gear having a different number of teeth from the first detection body 2 on the outer periphery of the second detection body 3 meshes with the spur gear on the outer periphery of the first detection body 2.

  In addition, the diameter and the number of teeth of these gears are the largest in the rotating body 1, and are decreasing in the order of the first detecting body 2 and the second detecting body 3. For example, the number of teeth of the rotating body 1 is 48, The number of teeth of the first detection body 2 is 32, and the number of teeth of the second detection body 3 is 28.

  Reference numeral 4 denotes a wiring board disposed substantially in parallel above the first detection body 2 and the second detection body 3, and a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces. A magnetic detecting element such as an AMR (anisotropic magnetoresistive) element is provided on the opposing surface of the magnet 5 mounted at the center of one detecting body 2 and the magnet 6 mounted at the center of the second detecting body 3. 7 and 8 are respectively mounted.

  The first detection means is formed by the magnet 5 and the magnetic detection element 7 opposed to each other, and the second detection means is formed by the magnet 6 and the magnetic detection element 8, respectively. The control means 12 connected to the magnetic detection elements 7 and 8 through the wiring pattern is formed by these electronic components.

  Further, the rotating body 1, the first detecting body 2, and the second detecting body 3 are rotatably held on the bottom surface of a lower case (not shown) made of an insulating resin, and the upper surfaces thereof are made of an insulating resin. An upper case (not shown) covers the rotation angle detection device 13.

  In FIG. 1, 13A is a rotation angle detection device formed in the same manner as the rotation angle detection device 13. The spur gear of the first detection body 2A is replaced with the spur gear of the rotation body 1A, and the second detection body 3A of FIG. The spur gear meshes with the spur gear of the first detection body 2A, and the magnetic detection elements 7A and 8A facing the first detection body 2A and the magnet (not shown) in the center of the second detection body 3A, Control means 12A is connected.

  Further, the control means 12 and 12A of the rotation angle detection devices 13 and 13A are configured to output the calculated rotation angles after different predetermined times, for example, the control means 12 after 1 msec and the control means 12A after 3 msec. In addition, when a rotation angle from another rotation angle detection device is detected, the rotation angle is not output.

  The rotation angle detectors 13 and 13A thus configured are arranged one above the other, the steering shaft is inserted into the inner periphery of the rotating bodies 1 and 1A, and mounted on the automobile, and the control means 12 and 12A are connected to the connector. And a lead wire (not shown), etc., are connected to the electronic circuit 11 of the vehicle, and the control means 12 and 12A are further connected to constitute a rotation angle detection system.

  In the above configuration, when the steering is rotated, the rotating body 1 is rotated, and the first detecting body 2 is rotated in conjunction with the rotating body 1 and the second detecting body 3 is rotated in conjunction with the first detecting body 2. Therefore, the magnets 5 and 6 mounted in the center also rotate, and the magnetic detection elements 7 and 8 detect the changing magnetic force of the magnets 5 and 6, and sine waves, cosine waves, or substantially saw-tooth waves that repeatedly increase and decrease. The detection signal is input to the control means 12.

  At this time, since the first detector 2 and the second detector 3 are different in the number of teeth of the spur gear, the data waveforms output from the magnetic detection elements 7 and 8 have different shapes and phase differences. It becomes a certain detection signal.

  Then, from the two different detection signals from the first detection body 2 and the second detection body 3 and the number of teeth of each spur gear, the control means 12 performs a predetermined calculation to determine the rotation body 1, that is, the steering wheel. The rotation angle is calculated, and the rotation angle is output to the electronic circuit 11 and the control means 12A of the automobile body after a predetermined time, for example, 1 msec.

  At this time, the rotating body 1A is also rotated at the same time, and the first detecting body 2A and the second detecting body 3A are also rotated in conjunction with this, so that the detection signals are also controlled by the magnetic detecting elements 7A and 8A. The control unit 12A calculates the rotation angle of the rotating body 1A, and the control unit 12A is configured to output the calculated rotation angle after, for example, 3 milliseconds, and from the control unit 12 before outputting this, the control unit 12A outputs the calculated rotation angle. Since the rotation angle is already detected, the rotation angle is not output to the electronic circuit 11.

  Accordingly, only the rotation angle from the control means 12 is input to the electronic circuit 11, and various controls of the vehicle such as a power steering device and a brake device are performed using this rotation angle.

  In other words, the control means 12 and 12A output the calculated rotation angles after different predetermined times, and when the rotation angles from the other are detected, the control means 12 and 12A are configured not to output the rotation angle, so that Since only one rotation angle signal from the control means 12 is input to the circuit 11, various signals are actually input from many sensors such as other brakes and accelerators in addition to the rotation angle detector. The load on the electronic circuit 11 performing these calculations and processing can be reduced.

  Furthermore, if a failure or the like occurs in any of the rotation angle detection devices 13 and 13A, for example, if a failure occurs in the rotation angle detection device 13, the rotation angle is not output from the control means 12. Since the control means 12A does not detect this, in this case, the rotation angle of the rotating body 1A equivalent to the rotating body 1 is output from the control means 12A to the electronic circuit 11, and the rotation angle from the control means 12A is used. The electronic circuit 11 performs various controls of the vehicle.

  That is, the control means 12 and 12A are configured to output the rotation angle when the rotation angle from the other is detected, but not to detect the rotation angle. In the unlikely event of a failure or the like in one of 13 and 13A, the rotation angle is output from the other that has not failed, thereby enabling the electronic circuit 11 to perform various controls of the vehicle. .

  In other words, the control means 12 and 12A output the calculated rotation angles after different predetermined times to form the rotation angle detection devices 13 and 13A, and connect the control means 12 and 12A. When a rotation angle is detected, the rotation angle detection system is configured so that the control means 12 and 12A do not output the rotation angle, so that the load on the electronic circuit 11 is reduced, and in the unlikely event that there is a failure or the like. Even if it occurs, the rotation angle is output from the other, so that the rotation angle can be reliably detected with a simple configuration.

  As described above, according to the present embodiment, the control means 12 and 12A of the rotation angle detection devices 13 and 13A output the calculated rotation angles after different predetermined times, connect them, and the rotation angle from the other. When a plurality of rotation angle detection devices 13 and 13A are used, only one rotation angle signal is input to the electronic circuit 11 of the vehicle. For this reason, the load on the electronic circuit 11 is reduced, and even if a failure or the like occurs on one side, the rotation angle is output from the other side, so that rotation with a simple configuration and reliable detection of the rotation angle is possible. An angle detection device and a rotation angle detection system using the angle detection device can be obtained.

  In the above description, the structure in which the spur gear of the first detector 2 is engaged with the spur gear of the rotating body 1 and the spur gear of the second detector 3 is engaged with the first detector 2 is described. However, as described in the background art section, a configuration in which both the first detector 2 and the spur gear of the second detector 3 are meshed with the spur gear of the rotating body 1 or one The present invention can be implemented even with a configuration in which only the spur gear of the detecting body is engaged with the spur gear of the rotating body 1.

  The rotation angle detection device and the rotation angle detection system using the same according to the present invention can obtain a reliable rotation angle with a simple configuration, and are mainly useful for detecting the rotation angle of the steering of an automobile. is there.

DESCRIPTION OF SYMBOLS 1, 1A rotator 2, 2A 1st detection body 3, 3A 2nd detection body 4 Wiring board 5, 6 Magnet 7, 7A, 8, 8A Magnetic detection element 11 Electronic circuit 12, 12A Control means 13, 13A Rotation Angle detector

Claims (2)

A rotating body that rotates in conjunction with the steering, a detecting body that rotates in conjunction with the rotating body, a detecting means that detects the rotation of the detecting body, and a rotation angle of the rotating body based on a detection signal from the detecting means A rotation angle detecting device that outputs a rotation angle calculated by the control means after a predetermined time. The control means of a plurality of rotation angle detection devices having different times for outputting the rotation angle according to claim 1 are connected, and when the rotation angle from another rotation angle detection device is detected, the control means rotates. A rotation angle detection system that does not output an angle.

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