JP2007132742A - Rotation angle detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotational angle detection device capable of appropriately increasing the response speed, while keeping a required detection accuracy. <P>SOLUTION: The rotational angle detection device comprises eight Hall element pairs 111a-111h for sensing variation of a magnetic vector MV emitted from a magnetic rotor 200 turning, in response to the turn of a crankshaft 300. The eight Hall element pairs 111a-111h are arranged so as to sense the variations of the magnetic vector MV as a sine wave signal with different phase. The rotation angle detection device has a signal processing section for selectively outputting one of output signals each rotation angle of the crankshaft 300, in a manner such that angle regions of high linearity of output signals, obtained by Hall element pairs 111a-111h are sequentially extracted, in response to the turn of the crankshaft 300. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotation angle detection device that detects a rotation angle of various detected rotating bodies such as a crankshaft using a magnetic sensing element.

  Conventionally, as this type of rotation angle detection device, for example, a rotation angle detection device described in Patent Document 1 is known. FIG. 8 shows an outline of a conventional general rotation angle detection device that detects the rotation angle of the crankshaft using a magnetic sensing element, including the rotation angle detection device described in Patent Document 1.

  As shown in FIGS. 8A and 8B, this apparatus adopts a horizontal Hall element that is generally used as a magnetic sensing element, and the two horizontal Hall elements 11a and 11b are IC chips. 1a and 1b are formed by resin molding. These two IC chips 1a and 1b are disposed at an angle of 90 degrees with each other, and are disposed opposite to a disk-shaped magnetized rotor RT in which N and S poles are separately magnetized. That is, the IC chips 1a and 1b detect the angle of the magnetic vector MV applied from the magnetized rotor RT to the Hall elements 11a and 11b and detect the crankshaft CS that is also the central axis of the magnetized rotor RT. The rotation angle is obtained.

  FIG. 9 is a block diagram showing the internal circuits of such IC chips 1a and 1b. Hereinafter, the electrical configuration and the operation based on the configuration will be further described with reference to FIG. explain. Such a rotation angle detection device can be realized by various electrical configurations. Here, a circuit that is currently practically used as an internal circuit of the IC chips 1a and 1b will be described.

As shown in FIG. 9, in the IC chips 1a and 1b, the Hall elements 11a and 11b are respectively driven by a constant current or a constant voltage from the drive circuits 10a and 10b. Here, as shown in FIG. 8B, these Hall elements 11a and 11b are provided such that their magnetic sensing surfaces are orthogonal to each other. The direction (angle) of the magnetic vector MV applied to the Hall elements 11a and 11b directly reflects the rotation angle of the magnetized rotor RT (crankshaft CS). With such a configuration, from the Hall elements 11a and 11b, the sin waveform voltage (Hall voltage) A, which is shifted in phase by 90 ° as shown in FIG. B will be taken as their output. The output signals A and B are sequentially taken into the amplifier circuits 12a and 12b and further to the A / D converters 13a and 13b in the IC chips 1a and 1b. Then, the amplifier circuits 12a and 12b respectively amplify as desired, and the A / D converters 13a and 13b respectively quantize them with a required resolution and then convert them into discrete values (digital values). The two output signals A and B discretized in this way are taken out from the output terminals of the IC chips 1a and 1b as angle information of the crankshaft CS, respectively, and then, for example, are used for controlling the fuel injection of the in-vehicle engine. It is taken into the angle calculation unit 24 in the control device 20. Normally, the angle calculation unit 24 performs digital correction (correction calculation) to a signal that linearly changes with respect to the rotation of the crankshaft CS, as shown in FIG. Based on the signal, the rotation angle of the crankshaft CS is detected. In the angle calculation unit 24, for example, when the output signal A is sin θ and the other output signal B is cos θ when the rotation angle of the magnetized rotor RT (crankshaft CS) is θ, Various digital operations such as “θ = tan ⁻¹ (A / B)” are performed.
JP 2004-340740 A

Thus, according to the conventional rotation angle detection device, the rotation angle of the crankshaft CS is surely detected based on the signal that changes linearly with respect to the rotation of the crankshaft CS. However, such a signal is obtained through various digital operations on the output signals A and B from the Hall elements 11a and 11b, such as “θ = tan ⁻¹ (A / B)”, and the response speed. There is still room for improvement.

  It should be noted that the present invention is not limited to a rotation angle detection device using a Hall element, and for example, a rotation angle detection device that obtains the digitally corrected signal using another magnetic detection element such as a magnetoresistive element. The tendency that such a calculation load cannot be ignored from when the output signal is obtained until the rotation angle is detected is generally the same.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rotation angle detection device capable of improving the response speed while maintaining the required detection accuracy. .

  In order to achieve such an object, in the rotation angle detecting device according to claim 1, the phase of the change in the magnetic vector emitted from the magnet rotating with the rotation of the rotation shaft to be detected as the rotation angle is different. A plurality of magnetic sensing elements arranged to sense as a sine wave signal and an angular region with high linearity of an output signal obtained separately from the plurality of magnetic sensing elements are sequentially extracted as the rotating shaft rotates. A signal processing unit that selectively outputs one of the output signals for each rotation angle of the rotation shaft, and detecting the rotation angle of the rotation shaft based on a signal from the signal processing unit. It was.

According to such a configuration, the output signal from the plurality of magnetic sensing elements is desired without performing the above-described correction operation (for example, “θ = tan ⁻¹ (A / B)”) on the signal waveforms. A signal with high linearity can be obtained. Therefore, it is possible to improve the response speed while maintaining the required detection accuracy.

  In addition, as the angle region with high linearity of the output signal obtained separately for the plurality of magnetic sensing elements, in the rotation angle detection device according to claim 1, as in the rotation angle detection device according to claim 2, Setting the angle regions in the vicinity of “θ = 0 °” or “θ = 180 °” of the sine wave signal sin θ ensures proper linearity of the signal extracted from the signal processing unit. Practically desirable. Specifically, a predetermined angle including “θ = 0 °” of “−45 ° ≦ θ ≦ + 45 °” of the sine wave signal sin θ as in the rotation angle detection device according to claim 3. A predetermined angle region including “θ = 180 °” of “135 ° ≦ θ ≦ 225 °” is set.

  Further, in the rotation angle detection device according to claim 2 or 3, as in the rotation angle detection device according to claim 4, the angle region having high linearity of the output signal obtained separately from the plurality of magnetic sensing elements. If the same angle region of the sine wave signal sin θ is set, the linearity of the signal extracted from the signal processing unit with respect to the rotation of the rotation shaft becomes more uniform over the wide angle range. An improvement in the linearity (linearity) and, in turn, an improvement in the detection accuracy of the rotation angle can be expected.

  Further, in the rotation angle detection device according to claim 4, as in the rotation angle detection device according to claim 5, the number of the plurality of magnetic sensing elements and an output signal obtained separately for the plurality of magnetic sensing elements. If the size of the angle region with high linearity is set to the number and size that enable detection of the rotation angle in the angle range of “360 °” with respect to the rotation of the rotation shaft, respectively. Thus, it becomes possible to obtain a signal that linearly changes in an angle range of “360 °” with respect to the change in the angle of the magnetic vector accompanying the rotation of the rotating shaft, and the versatility is further improved. In addition, as such a rotation angle detection device, for example, as in the rotation angle detection device according to claim 6, the plurality of magnetic sensing elements are configured such that each magnetic sensing surface is inclined by “45 °”. As an angular region with high linearity of an output signal obtained separately from the plurality of magnetic sensing elements, the sinusoidal signal sin θ is expressed as “−22.5 ° ≦ θ ≦ + 22.5. There are some which set the angle area of “°”.

  Further, in the rotation angle detection device according to any one of claims 4 to 6, as in the rotation angle detection device according to claim 7, a signal extracted from the signal processing unit is a rotation angle of the rotation shaft. If the output signals obtained separately for the plurality of magnetic sensing elements have different offsets so that the signals have unique values, the magnetic sensing elements selected by the signal processing unit are recognized. Even if not, the rotation angle of the rotation shaft can be detected only by the value of the signal extracted from the signal processing unit.

  Further, in the rotation angle detection device according to claim 7, as in the rotation angle detection device according to claim 8, the signal extracted from the signal processing unit continuously changes as the rotation shaft rotates. If the output signals obtained separately for each of the plurality of magnetic sensing elements have different offsets so as to be a signal to be obtained, an angle change rate with respect to an angle range of “360 °” of the rotation angle of the rotation shaft, The output value change rate with respect to the angle range of “360 °” of the signal extracted from the signal processing unit is substantially equal, and a more detailed analysis of the rotation mode of the rotation shaft is possible.

  The processing mode related to selection of the plurality of magnetic sensing elements by the signal processing unit is basically arbitrary. However, in view of the fact that the rotation mode of the rotation shaft is directly reflected in the transition of the output signal obtained separately for the plurality of magnetic sensing elements, the rotation angle according to any one of claims 4 to 8. In the detection device, as in the rotation angle detection device according to claim 9, the signal processing unit determines each rotation angle of the rotation shaft based on each output value of an output signal obtained separately for each of the plurality of magnetic sensing elements. It is practically desirable to selectively output one of these output signals in order to maintain a favorable response speed.

  However, particularly in this case, as in the rotation angle detection device according to claim 10, the signal processing unit is configured to compare an output signal obtained separately for the plurality of magnetic sensing elements with a predetermined threshold voltage. It is more desirable to binarize each of them and selectively output one of the output signals for each rotation angle of the rotary shaft based on a combination pattern of output levels of the binarized signals. That is, in such a configuration, it becomes possible to recognize one output signal to be uniquely selected from the pattern of combinations of the output levels of the binarized signals. For example, the rotation direction of the rotary shaft can be changed during the selection. Thus, it is possible to reduce the calculation load appropriately, such as eliminating the need for monitoring.

  Further, the magnet that rotates with the rotation of the rotation shaft that is the detection target of the rotation angle and the magnetic sensing element are basically arbitrary. However, as in the rotation angle detection device according to claim 11, the magnet is a disc-shaped magnetized rotor formed integrally with the rotating shaft in such a manner that the N pole and the S pole are separated and magnetized. The plurality of magnetic sensing elements and the signal processing unit are integrated as a single semiconductor chip, and the magnetic sensing element senses a magnetic vector parallel to the semiconductor substrate surface based on the Hall effect. If it consists of a type | mold Hall element, integration (miniaturization) as the said rotation angle detection apparatus can be achieved easily. In addition, the positional relationship between the Hall elements can be set more accurately through the semiconductor process.

  When such a vertical Hall element is adopted as the magnetic sensing element, a plurality of magnetic sensing elements are annularly formed on the same semiconductor substrate as in the rotation angle detecting device according to claim 12. It becomes possible to arrange many magnetic sensing elements in a limited space.

Hereinafter, an embodiment of a rotation angle detection device according to the present invention will be described in detail with reference to FIGS.
First, the configuration of the rotation angle detection device will be described in detail with reference to FIG. FIG. 1A is a side view showing a side structure of the apparatus, and FIG. 1B is a plan view showing a planar structure of the apparatus.

  As shown in FIG. 1A, the rotation angle detection apparatus according to this embodiment includes a sensor unit 111 that employs a so-called vertical Hall element as a magnetic sensing element, and a signal processing unit as one IC chip 100. The integrated circuit is arranged opposite to a disk-shaped magnetized rotor (magnet) 200 in which the N pole and the S pole are separated and magnetized. In other words, the IC chip 100 constituting the rotation angle detecting device can detect the crank that is also the central axis of the magnetized rotor 200 through the angle detection of the magnetic vector MV applied from the magnetized rotor 200 to the sensor unit 111. The rotation angle of the shaft 300 is obtained.

  However, in the rotation angle detection device according to this embodiment, the sensor unit 111 has a magnetic sensing surface for detecting a change in the magnetic vector MV as shown in FIG. It is composed of eight Hall elements 111a to 111h arranged in an annular shape on the same semiconductor substrate in a tilted manner. In such a configuration as the sensor unit 111, when the magnetic vector MV changes as the crankshaft 300 rotates, the sensor unit 111 outputs eight sine wave signals (Hall voltage signals) having different phases. A to H are taken out.

  On the other hand, the signal processing unit is a part that sequentially takes out angular regions with high linearity of such output signals (sinusoidal signals) A to H as the crankshaft 300 rotates. One of the output signals A to H is selectively output at every rotation angle.

FIG. 2 is a block diagram showing an outline of the signal processing unit according to this embodiment, including the relationship with the sensor unit 111.
As shown in FIG. 2, the signal processing unit is roughly
A switching element (not shown) such as a transistor is disposed in addition to the output path of the Hall elements 111a to 111h, and output signals A to A obtained separately for the Hall elements 111a to 111h through on / off switching of the switching elements. A switching circuit 121 that selectively outputs one of H.
A switching control unit 122 that performs on / off switching control of each of the switching elements based on output values of the output signals A to H obtained separately from the Hall elements 111a to 111h.
And so on.

  3A to 3H show the relationship between the signals used for switching control by the switching control unit 122 and the rotation angle of the crankshaft 300, including the output signals A to H extracted from the sensor unit 111. FIG. The eight Hall elements 111a to 111h are separately shown.

  Here, as shown in FIGS. 3A to 3H, the switching control unit 122 has a sine as an angular region with high linearity of the output signals A to H obtained separately from the Hall elements 111a to 111h. An angular region of “−22.5 ° ≦ θ ≦ + 22.5 °” of the wave signal sin θ is set (indicated by solid lines of the output signals A to H in FIGS. 3A to 3H). Angle area). Further, the switching control unit 122 applies a voltage of “−22.5 °” of the sine wave signal sin θ in order to sequentially extract such angular regions of the output signals A to H as the crankshaft 300 rotates. The threshold voltages th1 to th8 are set separately for the output signals A to H in a manner corresponding to the level. The output signals A to H are binarized based on the comparison with the threshold voltages th1 to th8, respectively, and the rotation angle of the crankshaft 300 is based on the combination pattern of the output levels of the binarized signals CA to CH. Each of these output signals A to H is determined every time.

That is, if such binarized signals CA to CH are obtained, the rotation angle of the crankshaft 300 is determined as follows.
An angle area AA in which the output levels of the binarized signals CA and CE to CH are “H (high)” levels and the output levels of the binarized signals CB to CD are “L (low)” levels.
An angular region AB in which the output levels of the binarized signals CA, CB, and CF to CH are “H (high)” levels and the output levels of the binarized signals CC to CE are “L (low)” levels.
An angular region AC in which the output levels of the binarized signals CA to CC, CG, and CH are “H (high)” levels and the output levels of the binarized signals CD to CF are “L (low)” levels.
An angle region AD in which the output levels of the binarized signals CA to CD and CH are “H (high)” levels and the output levels of the binarized signals CE to CG are “L (low)” levels.
An angular region AE in which the output levels of the binarized signals CA to CE are “H (high)” levels and the output levels of the binarized signals CF to CH are “L (low)” levels.
An angular area AF in which the output levels of the binarized signals CB to CF are “H (high)” levels and the output levels of the binarized signals CA, CG, and CH are “L (low)” levels.
An angle region AG in which the output levels of the binarized signals CC to CG are “H (high)” levels and the output levels of the binarized signals CA, CB, and CH are “L (low)” levels.
An angular region AH in which the output levels of the binarized signals CD to CH are “H (high)” levels and the output levels of the binarized signals CA to CC are “L (low)” levels.
These angular regions AA to AH are angle regions with high linearity of the output signals A to H (in FIGS. 3A to 3H). , The angle regions indicated by the solid lines of the output signals A to H). In this regard, in the switching control unit 122 according to this embodiment, as shown in FIG. 5, the output signals A to H correspond to patterns of combinations of output levels of the binarized signals CA to CH. An associated table is provided, and on / off switching control of the switching element is performed for each rotation angle of the crankshaft 300 based on the table. In such a configuration as the signal processing unit, as shown in FIG. 4, a signal Vout that linearly changes with respect to the rotation of the crankshaft 300 is extracted from the switching circuit 121. The rotation angle of the crankshaft 300 can be detected based on the signal Vout.

Incidentally, in this embodiment, as is apparent from FIG. 4, the output signals A to H obtained separately from the eight Hall elements 111a to 111h include the signal Vout extracted from the switching circuit 121.
(A) It has a unique value with respect to the rotation angle of the crankshaft 300.
(B) Changes continuously as the crankshaft 300 rotates.
Different offsets are provided so that the signals satisfy the logical product conditions. Note that such offset applying means (not shown) can be realized by various configurations, for example,
Means for giving different offsets to the output signals A to H upon input to the switching circuit 121.
Means for providing an offset according to the selection after any of the output signals A to H is selected.
And so on.

As described above, according to the rotation angle detection device of this embodiment, the following excellent effects can be obtained.
(1) The Hall elements 111a to 111h are arranged so as to detect changes in the magnetic vector MV emitted from the magnetized rotor 200 as sinusoidal signals having different phases. Then, the highly linear angle regions of the output signals A to H obtained separately from the Hall elements 111 a to 111 h are sequentially taken out as the crankshaft 300 rotates. In such a configuration, the output signals A to H from the Hall elements 111a to 111h are subjected to cranking without performing the above-described correction operation (for example, “θ = tan ⁻¹ (A / B)”) on the signal waveforms. By simply switching the output signals A to H for each rotation angle of the shaft 300, a desired signal with high linearity can be obtained. Therefore, it is possible to improve the response speed while maintaining the required detection accuracy.

  (2) The same angle region of the sine wave signal sin θ (“−22.5 ° ≦ θ ≦ + 22.5 °”) as the highly linear angle region of the output signals A to H obtained separately from the Hall elements 111a to 111h. ) To be set. For this reason, the linearity of the signal Vout extracted from the switching circuit 121 with respect to the rotation of the crankshaft 300 becomes more uniform over the wide angular range, thereby improving the linearity (linearity) and detecting the rotation angle. An improvement in accuracy can be expected.

  (3) Eight Hall elements 111a to 111h are arranged in such a manner that each magnetic sensing surface is inclined by "45 [deg.]", And the sine wave signal sin? Each angular region of “−22.5 ° ≦ θ ≦ + 22.5 °” was set. For this reason, it becomes possible to obtain a signal Vout that linearly changes in an angle range of “360 °” with respect to the change in angle of the magnetic vector MV accompanying the rotation of the crankshaft 300, and is more versatile. It will be.

  (4) The output signals A to H obtained separately from the Hall elements 111a to 111h are different so that the signal Vout extracted from the switching circuit 121 has a specific value with respect to the rotation angle of the crankshaft 300. Added an offset. Therefore, the rotation angle of the crankshaft 300 can be detected only by the value of the signal Vout extracted from the switching circuit 121.

  (5) The output signals A to H obtained separately from the Hall elements 111 a to 111 h are different so that the signal Vout extracted from the switching circuit 121 is a signal that continuously changes as the crankshaft 300 rotates. Added an offset. For this reason, the angle change rate of the rotation angle of the crankshaft 300 with respect to the “360 °” angle range is substantially equal to the output value change rate of the signal Vout extracted from the switching circuit 121 with respect to the “360 °” angle range. Thus, a more detailed analysis of the rotation mode of the crankshaft 300 becomes possible.

  (6) The switching control unit 122 performs on / off switching control of the switching element for each rotation angle of the crankshaft 300 based on the table shown in FIG. For this reason, the response speed can be more suitably maintained, for example, it is not necessary to monitor the rotation direction of the crankshaft 300.

  (7) Since a vertical Hall element is adopted as the Hall element and the eight Hall elements 111a to 111h are annularly arranged on the same semiconductor substrate, the arrangement space can be used effectively.

In addition, the said embodiment can also be changed and implemented as follows.
As shown in FIG. 6, the signal Vout extracted from the switching circuit 121 does not necessarily change continuously with respect to the rotation of the crankshaft 300. Even in such a case, it is possible to detect the angle of the crankshaft 300 based on the signal.

  As shown in FIG. 7, the signal Vout extracted from the switching circuit 121 does not necessarily have a specific value with respect to the rotation angle of the crankshaft 300. Even in such a case, it is possible to detect the angle of the crankshaft 300 based on the content of the switching control by the switching control unit 122 and the selected signal. In this case, the output signals A to H do not need to have a predetermined offset.

  -The number of Hall elements and the size of the highly linear angle region of the output signal obtained separately for each Hall element is the rotation angle in the "360 °" angle range with respect to the rotation of the rotation shaft to be detected. It is not always necessary to set the number and size of detection to be possible. For example, when the rotation axis to be detected rotates within an angle range smaller than 360 °, the number of hall elements and the size of the angular area where the linearity of the output signal obtained separately for each hall element is high. These may be set in accordance with the rotation range of the rotation shaft.

  The same angular area of the sine wave signal sin θ does not necessarily have to be set as an angular area with high linearity of the output signal obtained separately for each Hall element. That is, in the rotation angle detection device, as long as the linearity of the signal extracted from the switching circuit 121 is ensured, at least the effect (1) can be obtained.

  A predetermined angular region including “θ = 0 °” in “−45 ° ≦ θ ≦ + 45 °” of the sine wave signal sin θ, or “θ = 180 ° in“ 135 ° ≦ θ ≦ 225 ° ”. Any angle region may be set as the above highly linear angle region. As such an angle region, in short, if each of the angle regions in the vicinity of “θ = 0 °” or “θ = 180 °” of the sine wave signal sin θ is set, the signal obtained from the switching circuit 121 will be described. Linearity is suitably ensured.

  The sensor unit may be any one having a plurality of Hall elements arranged so as to detect changes in the magnetic vector MV emitted from the magnetized rotor 200 as sinusoidal signals having different phases, and the configuration thereof is also arbitrary. It is. In this sense, a lateral Hall element that senses a magnetic vector perpendicular to the semiconductor substrate surface based on the Hall effect may be employed as the Hall element. However, in this case, integration as a rotation angle detection device becomes difficult.

The sensor unit may employ a magnetoresistive element (MRE) instead of the Hall element. In short, what is necessary is just to include a plurality of magnetic sensing elements for sensing changes in the magnetic vector.
The signal processing unit rotates the rotation shaft in such a way that a highly linear angle region of the output signal obtained separately for the plurality of magnetic sensing elements is sequentially extracted along with the rotation of the rotation shaft to be detected. Any one that selectively outputs one of these output signals for each angle may be used, and the configuration thereof is also arbitrary. For example, the sensor unit and the single semiconductor chip may not be integrated.

-Although the magnetized rotor 200 was employ | adopted as a magnet, what is necessary is just a magnet rotated with rotation of the rotating shaft made into the detection object of a rotation angle. An electromagnet may also be used.
In addition to the rotation angle of the crankshaft 300, the rotation angle of various rotating bodies such as the opening amount of the throttle valve may be detected. Further, an object other than the rotating body can be adopted as the detected rotating body as long as the displacement amount can be converted into the rotation angle.

(A) is a side view which shows typically the side structure including the relationship with a magnet about one Embodiment of the rotation angle detection apparatus concerning this invention. (B) is a top view which shows typically the planar structure including the relationship with a magnet about one Embodiment of the rotation angle detection apparatus concerning this invention. The block diagram which shows the outline | summary including the relationship with a sensor part about the signal processing part of the embodiment. (A) to (h) are output signals extracted from the sensor unit, threshold voltages set separately for these output signals, and binarized signals calculated based on a comparison between the output signals and the threshold voltages. , A graph showing the rotation angle of the crankshaft by hall element The graph which showed the signal taken out from the switching circuit of the embodiment for every rotation angle of the crankshaft. A table in which an output signal to be selected is associated with a pattern of combinations of output levels of binarized signals. The graph which shows another example of the signal taken out from a switching circuit. The graph which shows another example of the signal taken out from a switching circuit. (A) is a side view which shows typically the side structure of the conventional rotation angle detection apparatus. (B) is a top view which shows typically the planar structure of the conventional rotation angle detection apparatus. The block diagram which shows the internal circuit of the conventional rotation angle detection apparatus. (A) is a graph which shows the output signal by the conventional Hall element pair for every rotation angle of a crankshaft. (B) is a graph showing a signal obtained through a correction calculation of “θ = tan ⁻¹ (A / B)” for each rotation angle of the crankshaft.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... IC chip, 111a-111h ... Hall element, 121 ... Switching circuit, 122 ... Switching control part, 200 ... Magnetization rotor, 300 ... Crankshaft, AA-AH ... Angle region, MV ... Magnetic vector.

Claims (12)

A plurality of magnetic sensing elements arranged so as to sense a change in a magnetic vector emitted from a magnet that rotates as the rotation axis of the rotation angle is detected as a sinusoidal signal having a different phase; One of the output signals is selected for each rotation angle of the rotating shaft in such a manner that the highly linear angle region of the output signal obtained separately for the plurality of magnetic sensing elements is sequentially extracted as the rotating shaft rotates. A rotation angle detecting device, wherein the rotation angle of the rotation shaft is detected based on a signal from the signal processing unit. An angular region in the vicinity of “θ = 0 °” or “θ = 180 °” of the sine wave signal sin θ is set as an angular region with high linearity of an output signal obtained separately for each of the plurality of magnetic sensing elements. Item 2. The rotation angle detection device according to Item 1. A predetermined angle including “θ = 0 °” of “−45 ° ≦ θ ≦ + 45 °” of the sine wave signal sin θ, as an angular region with high linearity of the output signal obtained separately for the plurality of magnetic sensing elements. The rotation angle detection device according to claim 2, wherein a predetermined angle region including “θ = 180 °” of “135 ° ≦ θ ≦ 225 °” is set. 4. The rotation angle detection device according to claim 2, wherein the same angular region of the sine wave signal sin θ is set as an angular region with high linearity of an output signal obtained separately for each of the plurality of magnetic sensing elements. 5. The number of the plurality of magnetic sensing elements and the size of the highly linear angle region of the output signal obtained separately from the plurality of magnetic sensing elements are an angular range of “360 °” with respect to the rotation of the rotating shaft. The rotation angle detection device according to claim 4, wherein the rotation angle detection device is set to a number and a size that enable detection of the rotation angle. The plurality of magnetic sensing elements include eight magnetic sensing elements disposed so that each magnetic sensing surface is inclined by “45 °”, and linearity of an output signal obtained separately from the plurality of magnetic sensing elements. The rotation angle detection device according to claim 5, wherein each angle region of “−22.5 ° ≦ θ ≦ + 22.5 °” of the sine wave signal sin θ is set as a high angle region. The output signals obtained separately from the plurality of magnetic sensing elements are given different offsets so that the signal extracted from the signal processing unit has a specific value with respect to the rotation angle of the rotation shaft. The rotation angle detection apparatus as described in any one of Claims 4-6. The output signals obtained separately from the plurality of magnetic sensing elements are given different offsets so that the signal extracted from the signal processing unit becomes a signal that continuously changes as the rotating shaft rotates. The rotation angle detection device according to claim 7. The said signal processing part selectively outputs one of those output signals for every rotation angle of the said rotating shaft based on each output value of the output signal obtained separately for these magnetic sensing elements. The rotation angle detection device according to any one of the above. The signal processing unit binarizes output signals obtained separately for the plurality of magnetic sensing elements based on comparison with a predetermined threshold voltage, and rotates the output signals based on a combination pattern of output levels of the binarized signals. The rotation angle detection device according to claim 9, wherein one of the output signals is selectively output for each rotation angle of the shaft. The magnet is formed of a disk-shaped magnetized rotor formed integrally with the rotating shaft in such a manner that the N pole and the S pole are separately magnetized, and the plurality of magnetic sensing elements and the signal processing unit include: The integrated circuit as a single semiconductor chip, wherein the magnetic sensing element comprises a vertical Hall element that senses a magnetic vector parallel to the surface of the semiconductor substrate based on the Hall effect. The rotation angle detection device described. The rotation angle detection device according to claim 11, wherein the plurality of magnetic sensing elements are annularly arranged on the same semiconductor substrate.

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