JP2011033559A - Magnetic detection unit and rotation angle detection apparatus using the same - Google Patents

Magnetic detection unit and rotation angle detection apparatus using the same Download PDF

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JP2011033559A
JP2011033559A JP2009182152A JP2009182152A JP2011033559A JP 2011033559 A JP2011033559 A JP 2011033559A JP 2009182152 A JP2009182152 A JP 2009182152A JP 2009182152 A JP2009182152 A JP 2009182152A JP 2011033559 A JP2011033559 A JP 2011033559A
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rotation angle
detection
magnetic detection
magnetoresistive elements
magnetic
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JP5428625B2 (en
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Yasunori Tomino
泰範 冨野
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Panasonic Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic detection unit used for a rotation angle detection in an automobile steering, and the like, and provide a rotation angle detection apparatus using the same which does not have errors due to temperature change, or the like, and can detect a rotation angle accurately and without fail. <P>SOLUTION: A plurality of magnetoresistive elements 29, 30 are arranged radially so as to face each other, switching means 31, 32 are disposed each at one end, and a binarizing means 33 is connected to these switching means 31, 32, thereby forming the magnetic detection units 27, 28. The magnetic detection unit 27, 28 are arranged so as to face a first detector 22 and magnets 24, 25 which are at the center of the first detector 22, and the switching means 31, 32 are switched by a control means 35; and the rotation angle of a rotation body 21 is detected, on the basis of output signals of the magnetoresistive elements 29, 30, thereby obtaining those having no error due to temperature change, or the like, and is capable of detecting the rotation angle in an accurate and sure manner. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、主に自動車のステアリングの回転角度の検出等に用いられる磁気検出ユニット、及びこれを用いた回転角度検出装置に関するものである。   The present invention relates to a magnetic detection unit mainly used for detecting a rotation angle of a steering of an automobile, and a rotation angle detection device using the same.

近年、自動車の高機能化が進むなか、様々な回転角度検出装置を用いてステアリングの回転角度を検出し、この回転角度を用いて車両の各種制御を行うものが増えている。   In recent years, with the advancement of functions of automobiles, there are an increasing number of devices that detect the rotation angle of a steering using various rotation angle detection devices and perform various controls of the vehicle using the rotation angle.

このような、従来の回転角度検出装置について、図７〜図９を用いて説明する。   Such a conventional rotation angle detection device will be described with reference to FIGS.

図７は従来の回転角度検出装置の要部ブロック回路図、図８は同斜視図であり、同図において、１は外周に平歯車部１Ａが形成された回転体で、中央部には挿通するステアリング（図示せず）の軸と係合する係合部１Ｂが設けられている。   FIG. 7 is a block diagram of a main part of a conventional rotation angle detecting device, and FIG. 8 is a perspective view thereof. In FIG. 7, reference numeral 1 denotes a rotating body having a spur gear portion 1A formed on the outer periphery, and the central portion is inserted. An engaging portion 1B that engages with a shaft of a steering (not shown) is provided.

そして、２は外周に平歯車部２Ａが形成された第一の検出体、３は外周に第一の検出体２とは歯数の異なる平歯車部３Ａが形成された第二の検出体で、第一の検出体２と第二の検出体３が回転体１に各々噛合すると共に、第一の検出体２と第二の検出体３の中央には、磁石４と５がインサート成形等により各々装着されている。   Reference numeral 2 denotes a first detector having a spur gear portion 2A formed on the outer periphery, and reference numeral 3 denotes a second detector having a spur gear portion 3A having a different number of teeth from the first detector 2 on the outer periphery. The first detection body 2 and the second detection body 3 are respectively meshed with the rotating body 1, and magnets 4 and 5 are insert-molded at the center of the first detection body 2 and the second detection body 3. It is installed by each.

また、６は第一の検出体２と第二の検出体３の上面にほぼ平行に配置された配線基板で、上下面に複数の配線パターン（図示せず）が形成されると共に、第一の検出体２の磁石４との対向面には異方性磁気抵抗素子（以下、ＡＭＲ素子と記載する）７が、第二の検出体３の磁石５との対向面にはＡＭＲ素子８が各々装着されている。   Reference numeral 6 denotes a wiring board disposed substantially parallel to the upper surfaces of 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. An anisotropic magnetoresistive element (hereinafter referred to as an AMR element) 7 is provided on the surface of the detector 2 facing the magnet 4, and an AMR element 8 is provided on the surface of the second detector 3 facing the magnet 5. Each is installed.

そして、このＡＭＲ素子７や８は、図７に示すように、四つの磁気抵抗素子９を略矩形状に接続した第一のホイートストンブリッジ１０と第二のホイートストンブリッジ１１が、互いに４５度傾けて重ねて形成されると共に、この二つのホイートストンブリッジの結合点から導出した電源端子１０Ａと１１ＡがＤＣ５Ｖの電源に、電源端子１０Ａと１１Ａの対角位置の結合点から導出したグランド端子１０Ｂと１１Ｂがグランドに、各々接続されている。   Then, as shown in FIG. 7, the AMR elements 7 and 8 are configured such that the first Wheatstone bridge 10 and the second Wheatstone bridge 11 in which the four magnetoresistive elements 9 are connected in a substantially rectangular shape are inclined by 45 degrees from each other. The power terminals 10A and 11A derived from the coupling point of these two Wheatstone bridges are connected to the DC 5V power source, and the ground terminals 10B and 11B derived from the diagonal coupling point of the power terminals 10A and 11A are formed. Each is connected to ground.

また、これらとは異なる対角位置の結合点から導出した＋出力端子１０Ｃと１１Ｃ、及び−出力端子１０Ｄと１１Ｄが、トランジスタ等の増幅手段１２に各々接続されると共に、これらシリコンウェハー上に形成された磁気抵抗素子９や増幅手段１２を、絶縁樹脂製のモールド（図示せず）が覆っている。   In addition, + output terminals 10C and 11C and −output terminals 10D and 11D derived from coupling points at different diagonal positions are connected to the amplifying means 12 such as a transistor and formed on these silicon wafers. The formed magnetoresistive element 9 and amplification means 12 are covered with an insulating resin mold (not shown).

さらに、このＡＭＲ素子７や８が実装された配線基板６には、マイコン等を実装して制御手段１３が形成され、この制御手段１３に配線パターンを介して、増幅手段１２の出力端子１２Ａと１２Ｂが接続されて、回転角度検出装置が構成されている。   Further, on the wiring board 6 on which the AMR elements 7 and 8 are mounted, a control unit 13 is formed by mounting a microcomputer or the like. The control unit 13 is connected to the output terminal 12A of the amplifying unit 12 via the wiring pattern. 12B is connected and the rotation angle detection apparatus is comprised.

そして、このように構成された回転角度検出装置が、制御手段１３がコネクタやリード線（図示せず）等を介して、自動車の電子回路（図示せず）に接続されると共に、回転体１の係合部１Ｂにはステアリングの軸が挿通されて、自動車に装着される。   In the rotation angle detecting device configured as described above, the control unit 13 is connected to an electronic circuit (not shown) of an automobile via a connector, a lead wire (not shown) or the like, and the rotating body 1 A steering shaft is inserted into the engaging portion 1B and is attached to the automobile.

以上の構成において、運転時にステアリングを回転すると、回転体１が回転し、これに連動して第一の検出体２と第二の検出体３が各々回転するため、これらの中央に装着された磁石４と５も回転して、この磁石４と５の磁気の方向が変化し、これをＡＭＲ素子７と８が各々検出する。   In the above configuration, when the steering wheel is rotated during driving, the rotating body 1 rotates, and the first detecting body 2 and the second detecting body 3 rotate in conjunction with the rotation body 1. The magnets 4 and 5 also rotate to change the direction of magnetism of the magnets 4 and 5, and this is detected by the AMR elements 7 and 8, respectively.

そして、例えば、磁石４と対向したＡＭＲ素子７の、第一のホイートストンブリッジ１０の＋出力端子１０Ｃと−出力端子１０Ｄからは正弦波の出力信号が、第二のホイートストンブリッジ１１の＋出力端子１１Ｃと−出力端子１１Ｄからは余弦波の出力信号が、各々増幅手段１２に入力される。   For example, a sine wave output signal is output from the + output terminal 10 </ b> C and −output terminal 10 </ b> D of the first Wheatstone bridge 10 of the AMR element 7 facing the magnet 4, and the + output terminal 11 </ b> C of the second Wheatstone bridge 11. The output signal of the cosine wave is input to the amplifying means 12 from the output terminal 11D.

また、この正弦波と余弦波の出力信号を増幅手段１２が差動増幅し、例えば、出力端子１２Ａからは、図９（ａ）の波形図に示すような、電圧が１．５〜３．５Ｖ前後で正弦波の出力信号が、出力端子１２Ｂからは、図９（ｂ）に示すような、余弦波の出力信号が各々制御手段１３に出力される。   Further, the amplifying means 12 differentially amplifies the output signals of the sine wave and the cosine wave. For example, the voltage from the output terminal 12A as shown in the waveform diagram of FIG. A sine wave output signal around 5V is output from the output terminal 12B to the control means 13 as shown in FIG. 9B.

さらに、磁石５と対向したＡＭＲ素子８からも同様に、正弦波と余弦波の出力信号が増幅手段１２を介して制御手段１３に出力されるが、第一の検出体２と第二の検出体３の平歯車部２Ａと３Ａは歯数が異なっているため、これらは位相差のある波形となって制御手段１３に入力される。   Further, similarly, output signals of a sine wave and a cosine wave are output from the AMR element 8 facing the magnet 5 to the control means 13 via the amplification means 12, but the first detector 2 and the second detection signal are output. Since the spur gear portions 2 </ b> A and 3 </ b> A of the body 3 have different numbers of teeth, they are input to the control means 13 as a waveform having a phase difference.

そして、この第一の検出体２と第二の検出体３からの出力信号と、各々の平歯車部の歯数から、制御手段１３が所定の演算を行って、回転体１即ちステアリングの回転角度を検出し、これが自動車本体の電子回路へ出力されて、車両の様々な制御が行われるように構成されている。   Then, the control means 13 performs a predetermined calculation from the output signals from the first detection body 2 and the second detection body 3 and the number of teeth of each spur gear portion, and the rotation of the rotating body 1, that is, the steering wheel An angle is detected, and this is output to the electronic circuit of the automobile body so that various controls of the vehicle are performed.

なお、上記のように、ＡＭＲ素子７と８からの正弦波と余弦波の出力信号によって回転角度の検出を行う際、略矩形状に接続された四つの磁気抵抗素子９のばらつきによって、特に、回転角度検出装置が使用される周囲温度が高い場合には、制御手段１３に入力される出力信号にばらつきが生じ、回転角度の検出に誤差が発生する場合がある。   As described above, when the rotation angle is detected by the output signals of the sine wave and cosine wave from the AMR elements 7 and 8, due to the variation of the four magnetoresistive elements 9 connected in a substantially rectangular shape, When the ambient temperature at which the rotation angle detection device is used is high, the output signal input to the control means 13 may vary, and an error may occur in detection of the rotation angle.

つまり、例えば、ＡＭＲ素子７や８の第一のホイートストンブリッジ１０の＋出力端子１０Ｃの電圧は、磁気抵抗素子９Ａと９Ｂの分圧となっているため、磁気抵抗素子９Ａと９Ｂの温度変化による抵抗値変化に差があった場合、＋出力端子１０Ｃから出力される正弦波の出力信号の、振幅中心電圧にずれが生じる。   That is, for example, since the voltage at the + output terminal 10C of the first Wheatstone bridge 10 of the AMR elements 7 and 8 is a divided voltage of the magnetoresistive elements 9A and 9B, it depends on the temperature change of the magnetoresistive elements 9A and 9B. When there is a difference in resistance value change, a deviation occurs in the amplitude center voltage of the sine wave output signal output from the + output terminal 10C.

そして、この時、例えば、磁気抵抗素子９Ａの抵抗値が磁気抵抗素子９Ｂの抵抗値より小さかった場合、振幅中心電圧は電源電圧側にずれるため、増幅手段１２の出力端子１２Ａから出力される正弦波の出力信号は、図９（ｃ）の破線に示すように電源電圧側にずれたものとなる。   At this time, for example, when the resistance value of the magnetoresistive element 9A is smaller than the resistance value of the magnetoresistive element 9B, the amplitude center voltage shifts to the power supply voltage side, so that the sine output from the output terminal 12A of the amplifying unit 12 The wave output signal is shifted to the power supply voltage side as shown by the broken line in FIG.

したがって、このようなずれた出力信号によって制御手段１３が回転角度の演算を行った場合には、回転角度の検出に誤差が発生してしまい、精度の劣った回転角度の検出となってしまうものであった。   Therefore, when the control means 13 calculates the rotation angle using such a shifted output signal, an error occurs in the detection of the rotation angle, resulting in detection of the rotation angle with poor accuracy. Met.

なお、この出願の発明に関連する先行技術文献情報としては、例えば、特許文献１が知られている。   As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

特開２００７−２５６１３９号公報JP 2007-256139 A

しかしながら、上記従来の回転角度検出装置においては、特に高温下で使用された場合、磁気抵抗素子９の温度による抵抗値の変化によって出力信号の電圧にずれが発生し、回転角度の検出に誤差が生じる場合があるため、高精度な角度検出を行うことが困難であるという課題があった。   However, in the above conventional rotation angle detection device, especially when used at a high temperature, a deviation occurs in the voltage of the output signal due to a change in the resistance value due to the temperature of the magnetoresistive element 9, and an error occurs in the detection of the rotation angle. Since this may occur, there is a problem that it is difficult to perform highly accurate angle detection.

本発明は、このような従来の課題を解決するものであり、温度変化による誤差等がなく、高精度で確実な回転角度の検出が可能な磁気検出ユニット、及びこれを用いた回転角度検出装置を提供することを目的とする。   The present invention solves such a conventional problem, and there is no error due to a temperature change and the like, and a magnetic detection unit capable of detecting a rotation angle with high accuracy and reliability, and a rotation angle detection device using the same The purpose is to provide.

上記目的を達成するために本発明は、以下の構成を有するものである。   In order to achieve the above object, the present invention has the following configuration.

本発明の請求項１に記載の発明は、複数の磁気抵抗素子を放射状に対向させて配列すると共に、この一端に切換手段を各々設け、これらの切換手段を二値化手段に接続して磁気検出ユニットを構成したものであり、この磁気検出ユニットを検出体中央の磁石に対向して配置し、制御手段によって回転体の回転角度の検出を行う際、複数の磁気抵抗素子の抵抗値に温度による多少の変化や、抵抗値変化の差があった場合でも、制御手段が二値化手段からの出力信号を演算して、回転角度を検出することで、回転角度の正しい検出を行うことができるため、温度変化等による誤差がなく、高精度で確実な回転角度の検出が可能な磁気検出ユニットを得ることができるという作用を有する。   According to the first aspect of the present invention, a plurality of magnetoresistive elements are arranged radially facing each other, and switching means is provided at one end thereof, and these switching means are connected to the binarization means so as to be magnetic. This is a detection unit, and when this magnetism detection unit is arranged facing the magnet in the center of the detection body and the rotation angle of the rotation body is detected by the control means, the resistance values of the plurality of magnetoresistive elements are Even if there is a slight change due to or a difference in resistance value change, the control means calculates the output signal from the binarization means and detects the rotation angle, so that the rotation angle can be detected correctly. Therefore, there is an effect that it is possible to obtain a magnetic detection unit that is free from errors due to temperature changes and the like and can detect a rotation angle with high accuracy and reliability.

請求項２に記載の発明は、請求項１記載の磁気検出ユニットを、回転体に連動して回転する検出体中央の磁石に対向して配置し、制御手段が磁気検出ユニットの切換手段を切換え、磁気抵抗素子の出力信号から回転体の回転角度を検出するようにして回転角度検出装置を構成したものであり、温度変化等による誤差がなく、高精度で確実な回転角度の検出が可能な回転角度検出装置を実現することができるという作用を有する。   According to a second aspect of the present invention, the magnetic detection unit according to the first aspect is arranged opposite to the magnet at the center of the detection body rotating in conjunction with the rotation body, and the control means switches the switching means of the magnetic detection unit. The rotation angle detection device is configured so as to detect the rotation angle of the rotating body from the output signal of the magnetoresistive element, and there is no error due to temperature change and the like, and it is possible to detect the rotation angle with high accuracy and reliability. It has the effect | action that a rotation angle detection apparatus is realizable.

以上のように本発明によれば、温度変化等による誤差がなく、高精度で確実な回転角度の検出が可能な磁気検出ユニット、及びこれを用いた回転角度検出装置を実現することができるという有利な効果が得られる。   As described above, according to the present invention, it is possible to realize a magnetic detection unit capable of detecting a rotation angle with high accuracy and reliability without an error due to a temperature change or the like, and a rotation angle detection device using the same. An advantageous effect is obtained.

本発明の一実施の形態による回転角度検出装置の要部ブロック回路図1 is a block diagram of a main part of a rotation angle detection device according to an embodiment of the present invention. 同斜視図Same perspective view 同波形図Waveform diagram 同波形図Waveform diagram 同波形図Waveform diagram 同波形図Waveform diagram 従来の回転角度検出装置の要部ブロック回路図Main part block circuit diagram of conventional rotation angle detection device 同斜視図Same perspective view 同波形図Waveform diagram

以下、本発明の実施の形態について、図１〜図６を用いて説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

（実施の形態）
図１は本発明の一実施の形態による回転角度検出装置の要部ブロック回路図、図２は同斜視図であり、同図において、２１は外周に平歯車部２１Ａが形成された回転体で、中央部には挿通するステアリング（図示せず）の軸と係合する係合部２１Ｂが設けられている。 (Embodiment)
FIG. 1 is a block circuit diagram of a main part of a rotation angle detecting device according to an embodiment of the present invention, FIG. 2 is a perspective view thereof, and in FIG. 1, reference numeral 21 denotes a rotating body having a spur gear portion 21A formed on the outer periphery. The center portion is provided with an engaging portion 21B that engages with a shaft of a steering (not shown) to be inserted.

そして、２２は外周に平歯車部２２Ａが形成された第一の検出体、２３は外周に第一の検出体２２とは歯数の異なる平歯車部２３Ａが形成された第二の検出体で、第一の検出体２２が回転体２１に、第二の検出体２３が第一の検出体２２に各々噛合すると共に、第一の検出体２２と第二の検出体２３の中央には、磁石２４と２５がインサート成形等により各々装着されている。   Reference numeral 22 denotes a first detector having a spur gear portion 22A formed on the outer periphery, and reference numeral 23 denotes a second detector having a spur gear portion 23A having a different number of teeth from the first detector 22 on the outer periphery. The first detection body 22 meshes with the rotating body 21 and the second detection body 23 meshes with the first detection body 22, respectively. At the center of the first detection body 22 and the second detection body 23, Magnets 24 and 25 are mounted by insert molding or the like.

また、２６は第一の検出体２２と第二の検出体２３の上面にほぼ平行に配置された配線基板で、上下面に複数の配線パターン（図示せず）が形成されると共に、第一の検出体２２の磁石２４との対向面には磁気検出ユニット２７が、第二の検出体２３の磁石２５との対向面には磁気検出ユニット２８が各々装着されている。   Reference numeral 26 denotes a wiring board disposed substantially parallel to the upper surfaces of the first detection body 22 and the second detection body 23. A plurality of wiring patterns (not shown) are formed on the upper and lower surfaces, and the first A magnetic detection unit 27 is mounted on the surface of the detection body 22 facing the magnet 24, and a magnetic detection unit 28 is mounted on the surface of the second detection body 23 facing the magnet 25.

そして、この磁気検出ユニット２７と２８は、図１に示すように、複数の磁気抵抗素子２９と３０が０．５〜１０度の角度間隔で、右側と左側に対向して放射状に配列されて形成されると共に、これら磁気抵抗素子２９と３０の外周側端部には、ＦＥＴ等の複数の切換手段３１と３２が各々接続されている。   In the magnetic detection units 27 and 28, as shown in FIG. 1, a plurality of magnetoresistive elements 29 and 30 are arranged radially facing the right and left sides at an angular interval of 0.5 to 10 degrees. At the same time, a plurality of switching means 31 and 32 such as FETs are connected to the outer peripheral end portions of the magnetoresistive elements 29 and 30, respectively.

また、これら磁気抵抗素子２９と３０の内周側端部は、例えば右側の磁気抵抗素子２９Ａや２９Ｂ等の内周側端部が連結されて電源に、左側の磁気抵抗素子３０Ａや３０Ｂ等の内周側端部が連結されてグランドに、各々接続されている。   Further, the inner peripheral side ends of these magnetoresistive elements 29 and 30 are connected to the power source by connecting the inner peripheral side end parts such as the right magnetoresistive elements 29A and 29B, and the left magnetoresistive elements 30A and 30B etc. The inner peripheral side ends are connected to each other and connected to the ground.

さらに、３３はコンパレータ等の二値化手段で、この二値化手段３３の＋端子に右側の切換手段３１Ａや３１Ｂ等が、−端子に左側の切換手段３２Ａや３２Ｂ等が各々接続されると共に、右側の切換手段３１Ａや３１Ｂ等は抵抗３６を介してグランドに、左側の切換手段３２Ａや３２Ｂ等は抵抗３４を介して電源に、各々接続されている。   Further, 33 is a binarizing means such as a comparator, and the right switching means 31A and 31B etc. are connected to the + terminal of the binarizing means 33 and the left switching means 32A and 32B etc. are connected to the − terminal. The right switching means 31A and 31B are connected to the ground via a resistor 36, and the left switching means 32A and 32B are connected to a power source via a resistor 34.

そして、シリコンウェハー上にスパッタ法等によって形成された、これら複数の磁気抵抗素子２９や３０、切換手段３１や３２、二値化手段３３等を、絶縁樹脂製のモールド（図示せず）が覆って、磁気検出ユニット２７や２８が形成されている。   A plurality of magnetoresistive elements 29 and 30, switching means 31 and 32, binarizing means 33, etc. formed on the silicon wafer by sputtering or the like are covered with an insulating resin mold (not shown). Thus, magnetic detection units 27 and 28 are formed.

つまり、複数の磁気抵抗素子２９と３０を右側と左側に対向して放射状に配列すると共に、この磁気抵抗素子２９と３０の外周側端部に切換手段３１と３２を設け、これらの切換手段３１と３２を二値化手段３３に接続して、磁気検出ユニット２７や２８が形成された構成となっている。   That is, a plurality of magnetoresistive elements 29 and 30 are arranged radially facing the right side and the left side, and switching means 31 and 32 are provided at the outer peripheral side ends of the magnetoresistive elements 29 and 30. And 32 are connected to the binarizing means 33 so that the magnetic detection units 27 and 28 are formed.

また、この磁気検出ユニット２７や２８が実装された配線基板２６には、マイコン等を実装して制御手段３５が形成され、この制御手段３５に配線パターンを介して、磁気検出ユニット２７と２８の二値化手段３３や、複数の切換手段３１と３２が接続されて、回転角度検出装置が構成されている。   On the wiring board 26 on which the magnetic detection units 27 and 28 are mounted, a control unit 35 is formed by mounting a microcomputer or the like, and the control unit 35 is connected to the magnetic detection units 27 and 28 via a wiring pattern. A binarizing means 33 and a plurality of switching means 31 and 32 are connected to constitute a rotation angle detecting device.

そして、このように構成された回転角度検出装置が、制御手段３５がコネクタやリード線（図示せず）等を介して、自動車の電子回路（図示せず）に接続されると共に、回転体２１の係合部２１Ｂにはステアリングの軸が挿通されて、自動車に装着される。   In the rotation angle detecting device configured as described above, the control means 35 is connected to an electronic circuit (not shown) of the automobile via a connector, a lead wire (not shown) or the like, and the rotating body 21. The steering shaft is inserted into the engaging portion 21B and is attached to the automobile.

以上の構成において、運転時にステアリングが回転すると、回転体２１が回転し、これに連動して第一の検出体２２が、第一の検出体２２に連動して第二の検出体２３が各々回転するため、これらの中央に装着された磁石２４と２５も回転して、この磁石２４と２５の磁気の方向が変化し、これを磁気検出ユニット２７と２８が各々検出する。   In the above configuration, when the steering wheel is rotated during driving, the rotating body 21 is rotated, and the first detecting body 22 is interlocked with the rotating body 21 and the second detecting body 23 is interlocked with the first detecting body 22. Because of the rotation, the magnets 24 and 25 mounted in the center also rotate, and the direction of magnetism of the magnets 24 and 25 changes, and this is detected by the magnetic detection units 27 and 28, respectively.

つまり、図３（ａ）の波形図に示すように、先ず磁気検出ユニット２７と２８の制御手段３５から、制御信号ＬＡが時間ＴＡからＴＢの間出力されて、右側の切換手段３１Ａと左側の切換手段３２ＡがＯＮとなり、磁気抵抗素子２９Ａとこれに対向した磁気抵抗素子３０Ａが、磁石２４や２５の磁気方向を検出する。   That is, as shown in the waveform diagram of FIG. 3A, first, the control signal LA is output from the control means 35 of the magnetic detection units 27 and 28 during the time TA to TB, and the right switching means 31A and the left switching means 31A are output. The switching means 32A is turned ON, and the magnetoresistive element 29A and the magnetoresistive element 30A opposed thereto detect the magnetic direction of the magnets 24 and 25.

なお、磁気抵抗素子２９や３０は、これに流れる電流の方向と磁気の方向の傾き角度によって抵抗値が変化し、これが０度の場合には抵抗値は小さくなり、９０度の場合には抵抗値が最大となるように形成されている。   The resistance values of the magnetoresistive elements 29 and 30 change depending on the inclination angle between the direction of the current flowing therethrough and the direction of the magnetism. When this is 0 degree, the resistance value is small, and when the degree is 90 degrees, the resistance value is small. It is formed so that the value is maximized.

したがって、この時、例えば車両が直進状態でステアリングの回転角度が０度、すなわち磁石２４と２５の磁気方向が、図１の上下方向であった場合、磁気抵抗素子２９Ａと３０Ａはこの磁気方向と平行に配列され、流れる電流の方向と磁気の方向の傾き角度が０度であるため、磁気抵抗素子２９Ａと３０Ａの抵抗値は小さなものとなる。   Therefore, at this time, for example, when the vehicle is in a straight traveling state and the steering rotation angle is 0 degree, that is, the magnetic direction of the magnets 24 and 25 is the vertical direction in FIG. 1, the magnetoresistive elements 29A and 30A Since they are arranged in parallel and the inclination angle between the flowing current direction and the magnetic direction is 0 degree, the resistance values of the magnetoresistive elements 29A and 30A are small.

そして、この磁気抵抗素子２９Ａと抵抗３６で分圧された、図３（ｂ）に示すような、小さな電圧ＭＡが二値化手段３３の＋端子に、磁気抵抗素子３０Ａと抵抗３４で分圧され大きさが反転した、図３（ｃ）に示すような、大きな電圧ＮＡが二値化手段３３の−端子に、各々入力される。   A small voltage MA divided by the magnetoresistive element 29A and the resistor 36, as shown in FIG. 3B, is divided by the magnetoresistive element 30A and the resistor 34 at the + terminal of the binarizing means 33. Then, a large voltage NA, as shown in FIG. 3C, whose magnitude is inverted, is input to the negative terminal of the binarizing means 33, respectively.

また、続いて、制御手段３５から図３（ａ）に示すように、制御信号ＬＢが時間ＴＢからＴＣの間出力されて、切換手段３１Ｂと３２ＢがＯＮとなり、磁気抵抗素子２９Ｂとこれに対向した磁気抵抗素子３０Ｂが、磁石２４や２５の磁気方向を検出する。   Subsequently, as shown in FIG. 3A, the control signal LB is output from time TB to TC from the control means 35, the switching means 31B and 32B are turned on, and the magnetoresistive element 29B is opposed to this. The magnetoresistive element 30 </ b> B detects the magnetic direction of the magnets 24 and 25.

なお、この時、磁気抵抗素子２９Ｂと３０Ｂは、磁石２４と２５の磁気方向である上下方向に対してやや傾いているため、図３（ｂ）や図３（ｃ）に示すように、これらと抵抗３６や３４で分圧された、電圧ＭＢは電圧ＭＡよりやや大きく、電圧ＮＢは電圧ＮＡよりやや小さなものとなる。   At this time, since the magnetoresistive elements 29B and 30B are slightly inclined with respect to the vertical direction which is the magnetic direction of the magnets 24 and 25, as shown in FIG. 3B and FIG. The voltage MB divided by the resistors 36 and 34 is slightly larger than the voltage MA, and the voltage NB is slightly smaller than the voltage NA.

さらに、この後、制御手段３５から制御信号が順次出力されて、複数の切換手段３１と３２が切換えられ、右側と左側に対向して放射状に配列された複数の磁気抵抗素子２９と３０が、磁石２４と２５の磁気方向を順次検出して、これらの電圧が二値化手段３３に入力される。   Further, thereafter, a control signal is sequentially output from the control means 35, the plurality of switching means 31 and 32 are switched, and a plurality of magnetoresistive elements 29 and 30 arranged radially facing the right side and the left side, The magnetic directions of the magnets 24 and 25 are sequentially detected, and these voltages are input to the binarizing means 33.

なお、これら複数の磁気抵抗素子２９と３０のうち、上記のように磁石２４と２５の磁気方向が上下方向の場合には、これと垂直な左右方向、すなわち９０度と２７０度の位置に配列された、磁気抵抗素子２９と３０の抵抗値が最も大きなものとなり、この後、抵抗値は順次小さなものとなっていく。   Of the plurality of magnetoresistive elements 29 and 30, when the magnetic directions of the magnets 24 and 25 are up and down as described above, they are arranged in the left and right directions perpendicular thereto, that is, at positions of 90 degrees and 270 degrees. The resistance values of the magnetoresistive elements 29 and 30 are the largest, and thereafter the resistance values are successively smaller.

つまり、制御手段３５が０度と１８０度の位置の切換手段３１Ａと３２Ａから、これらとほぼ真下あるいは真上の切換手段３１と３２まで順次切換えを行った場合、二値化手段３３の＋端子と−端子には、図４（ａ）の波形図に示すような、電圧信号ＭとＮが各々入力される。   That is, when the control unit 35 sequentially switches from the switching units 31A and 32A at the positions of 0 degrees and 180 degrees to the switching units 31 and 32 almost directly below or directly above them, the + terminal of the binarizing unit 33 The voltage signals M and N as shown in the waveform diagram of FIG.

また、二値化手段３３からは、時間ＴＡからＴ１の間と時間Ｔ２からＴＺの間は、電圧信号Ｍの電圧値が電圧信号Ｎよりも小さいためＬｏｗ、時間Ｔ１からＴ２の間は、電圧信号Ｍの電圧値が電圧信号Ｎよりも大きいためＨｉｇｈとなった、図４（ｂ）に示すような、電圧信号Ｓが制御手段３５へ出力される。   Further, from the binarizing means 33, the voltage value of the voltage signal M is lower during the period from the time TA to the time T1 and the time T2 to the time TZ because the voltage value of the voltage signal M is smaller than the voltage signal N. Since the voltage value of the signal M is higher than the voltage signal N, the voltage signal S is output to the control unit 35 as shown in FIG.

そして、この電圧信号Ｓから制御手段３５が磁石２４と２５の磁気方向を検出するが、制御信号を順次出力して、複数の切換手段３１と３２の切換えを行った制御手段３５は、例えば時間Ｔ１やＴ２の電圧信号Ｓが、右側と左側に対向して放射状に配列された複数の磁気抵抗素子２９と３０のうち、何度の位置に配列された磁気抵抗素子２９と３０によって検出されたものかを判別することが可能となっている。   The control means 35 detects the magnetic directions of the magnets 24 and 25 from the voltage signal S. The control means 35 that sequentially outputs the control signals and switches between the plurality of switching means 31 and 32, for example, The voltage signal S of T1 and T2 was detected by the magnetoresistive elements 29 and 30 arranged at many positions among the plurality of magnetoresistive elements 29 and 30 arranged radially facing the right side and the left side. It is possible to determine whether it is a thing.

このため、制御手段３５はこれらの磁気抵抗素子２９と３０が配列された角度によって、先ず、電圧信号Ｓの時間Ｔ１から例えば４５度の角度を、時間Ｔ２から１３５度の角度を各々検出し、これらを加算した後、半分に除算してＴ０の９０度という角度を算出し、さらにこれから９０度を減じて、磁石２４と２５の磁気方向の角度０度を検出する。   Therefore, the control means 35 first detects, for example, an angle of 45 degrees from the time T1 of the voltage signal S and an angle of 135 degrees from the time T2 according to the angle at which these magnetoresistive elements 29 and 30 are arranged, After adding these, it divides by half and calculates the angle of 90 degrees of T0, and further subtracts 90 degrees from this, and detects the angle of the magnets 24 and 25 in the magnetic direction of 0 degrees.

なお、以上の説明では判り易くするために、磁石２４と２５の磁気方向が上下方向、つまりステアリングの回転角度が０度の場合について説明したが、第一の検出体２２や第二の検出体２３が回転し、磁石２４と２５の磁気方向が、例えば３０度の場合には、二値化手段３３には、図５（ａ）の波形図に示すような、電圧信号Ｍ１とＮ１が各々入力される。   In the above description, the magnetic direction of the magnets 24 and 25 has been described in the vertical direction, that is, the case where the steering rotation angle is 0 degree. However, the first detection body 22 and the second detection body have been described. 23 rotates and the magnetic directions of the magnets 24 and 25 are, for example, 30 degrees, the voltage signal M1 and N1 as shown in the waveform diagram of FIG. Entered.

そして、二値化手段３３から制御手段３５へは電圧信号Ｓ１が出力され、制御手段３５が上記と同様に、７５度と１６５度を加算した後、これを半分に除算した角度１２０度から９０度を減じて、磁石２４と２５の磁気方向の角度３０度を検出する。   Then, the voltage signal S1 is output from the binarizing means 33 to the control means 35, and the control means 35 adds 75 degrees and 165 degrees, and then divides this by half, from the angle 120 degrees to 90 degrees. Decrease the degree and detect the angle of 30 degrees in the magnetic direction of the magnets 24 and 25.

また、磁石２４と２５の磁気方向が、例えば６０度の場合には、図５（ｂ）に示すように、二値化手段３３には電圧信号Ｍ２とＮ２が入力されると共に、二値化手段３３から制御手段３５へは電圧信号Ｓ２が出力され、制御手段３５が演算を行って、磁気方向の角度６０度を検出する。   When the magnetic directions of the magnets 24 and 25 are 60 degrees, for example, as shown in FIG. 5B, voltage signals M2 and N2 are input to the binarizing means 33 and binarization is performed. A voltage signal S2 is output from the means 33 to the control means 35, and the control means 35 performs an operation to detect an angle of 60 degrees in the magnetic direction.

なお、このように制御手段３５が複数の切換手段３１と３２を順次切換え、複数の磁気抵抗素子２９と３０の抵抗値をもとに形成された、二値化手段３３からの電圧信号によって、制御手段３５が磁石２４と２５の磁気方向の角度、つまり第一の検出体２２と第二の検出体２３の回転角度の検出を行うが、第一の検出体２２と第二の検出体２３の平歯車部２２Ａと２３Ａは歯数が異なっているため、これらは位相差のある波形となって制御手段３５に入力される。   In this manner, the control means 35 sequentially switches the plurality of switching means 31 and 32, and by the voltage signal from the binarizing means 33 formed based on the resistance values of the plurality of magnetoresistive elements 29 and 30, The control means 35 detects the angle of the magnets 24 and 25 in the magnetic direction, that is, the rotation angle of the first detection body 22 and the second detection body 23, and the first detection body 22 and the second detection body 23. Since the spur gear portions 22A and 23A have different numbers of teeth, they are input to the control means 35 as waveforms having a phase difference.

そして、この第一の検出体２２と第二の検出体２３からの二つの異なる出力信号と、各々の平歯車部の歯数から、制御手段３５が所定の演算を行って、回転体１即ちステアリングの回転角度を検出し、これが自動車本体の電子回路へ出力されて、車両の様々な制御が行われるように構成されている。   Then, the control means 35 performs a predetermined calculation from the two different output signals from the first detection body 22 and the second detection body 23 and the number of teeth of each spur gear portion, so that the rotary body 1, The rotation angle of the steering is detected, and this is output to the electronic circuit of the automobile body so that various controls of the vehicle are performed.

なお、上記のように、複数の磁気抵抗素子２９と３０の抵抗値をもとにした、二値化手段３３からの出力信号によって回転角度の検出を行う際、対向して放射状に配列された磁気抵抗素子２９や３０の抵抗値にばらつきや、特に、回転角度検出装置が使用される周囲温度が高い場合には、この温度変化による抵抗値変化に差が生じる場合がある。   As described above, when the rotation angle is detected by the output signal from the binarizing means 33 based on the resistance values of the plurality of magnetoresistive elements 29 and 30, they are arranged radially facing each other. Variations in the resistance values of the magnetoresistive elements 29 and 30, particularly when the ambient temperature in which the rotation angle detection device is used is high, may cause a difference in resistance value change due to this temperature change.

つまり、例えば、上述した場合と同様に、ステアリングの回転角度が０度で磁石２４と２５の磁気方向が上下方向であった場合、図６の波形図に示すように、正規の電圧信号ＭやＮに対し、磁気抵抗素子２９や３０の温度による抵抗値の変化によって、上下にずれた電圧信号Ｍ３やＮ３が二値化手段３３に入力される。   That is, for example, as in the case described above, when the steering rotation angle is 0 degree and the magnetic direction of the magnets 24 and 25 is the vertical direction, as shown in the waveform diagram of FIG. With respect to N, voltage signals M3 and N3 that are shifted up and down due to changes in the resistance value due to the temperature of the magnetoresistive elements 29 and 30 are input to the binarizing means 33.

このため、二値化手段３３から制御手段３５へも、正規の電圧信号Ｓに対してずれた電圧信号Ｓ３が出力されるが、この時、制御手段３５は上述したように、ずれた時間Ｔ３とＴ４から検出した角度を加算した後、半分に除算し、さらにこれから９０度を減じるという演算を行う。   For this reason, the voltage signal S3 deviated from the normal voltage signal S is also output from the binarizing means 33 to the control means 35. At this time, as described above, the control means 35 performs the deviated time T3. And the angle detected from T4 are added, and then the result is divided by half and further subtracted by 90 degrees.

したがって、上記のように二値化手段３３からの電圧信号Ｓ３がずれたものであった場合でも、時間Ｔ３とＴ４から検出した角度を加算した後、半分に除算してＴ０の９０度という角度が算出され、これから９０度を減じて、磁石２４と２５の正しい磁気方向の角度、０度が検出されるようになっている。   Therefore, even when the voltage signal S3 from the binarizing means 33 is deviated as described above, the angle detected from the times T3 and T4 is added and then divided by half to obtain an angle T0 of 90 degrees. Is calculated, and 90 degrees is subtracted from this, and the angle of the correct magnetic direction of the magnets 24 and 25, 0 degrees, is detected.

すなわち、制御手段３５が複数の切換手段３１と３２を順次切換え、複数の磁気抵抗素子２９と３０の抵抗値をもとに形成された、二値化手段３３からの出力信号によって、制御手段３５が磁石２４と２５の磁気方向の角度、つまり回転角度の検出を行うことで、温度変化による誤差がなく、高精度な回転角度の検出が可能なように構成されている。   That is, the control unit 35 sequentially switches the plurality of switching units 31 and 32, and the control unit 35 is output by an output signal from the binarizing unit 33 formed based on the resistance values of the plurality of magnetoresistive elements 29 and 30. However, by detecting the angle of the magnets 24 and 25 in the magnetic direction, that is, the rotation angle, there is no error due to a temperature change and the rotation angle can be detected with high accuracy.

つまり、複数の磁気抵抗素子２９と３０を放射状に対向して配列すると共に、制御手段３５が二値化手段３３から出力された電圧信号ＳやＳ３を演算して、回転角度の検出を行うことによって、複数の磁気抵抗素子２９や３０の抵抗値に温度による多少の変化や、抵抗値変化の差があった場合でも、電圧信号Ｍ３やＮ３の値が逆転するような極端な変化や差でない限り、回転角度の正しい検出が行えるようになっている。   That is, the plurality of magnetoresistive elements 29 and 30 are arranged radially opposite to each other, and the control means 35 calculates the voltage signals S and S3 output from the binarizing means 33 to detect the rotation angle. Therefore, even if there is a slight change due to temperature or a difference in resistance value in the resistance values of the plurality of magnetoresistive elements 29 and 30, it is not an extreme change or difference in which the values of the voltage signals M3 and N3 are reversed. As long as the rotation angle is correctly detected.

このように本実施の形態によれば、複数の磁気抵抗素子２９と３０を放射状に対向させて配列すると共に、この一端に切換手段３１と３２を各々設け、これらの切換手段３１と３２を二値化手段３３に接続して磁気検出ユニット２７や２８を形成すると共に、この磁気検出ユニット２７や２８を第一の検出体２２や第一の検出体２２中央の磁石２４や２５に対向して配置し、制御手段３５が切換手段３１と３２を切換え、磁気抵抗素子２９と３０の出力信号から回転体２１の回転角度を検出することによって、温度変化等による誤差がなく、高精度で確実な回転角度の検出が可能な磁気検出ユニット、及びこれを用いた回転角度検出装置を得ることができるものである。   As described above, according to the present embodiment, the plurality of magnetoresistive elements 29 and 30 are arranged so as to be radially opposed to each other, and the switching means 31 and 32 are provided at one end, respectively. The magnetic detection units 27 and 28 are formed by connecting to the valuation means 33, and the magnetic detection units 27 and 28 are opposed to the first detection body 22 and the magnets 24 and 25 at the center of the first detection body 22. The control means 35 switches the switching means 31 and 32, and detects the rotation angle of the rotating body 21 from the output signals of the magnetoresistive elements 29 and 30, so that there is no error due to a temperature change or the like, and it is highly accurate and reliable. A magnetic detection unit capable of detecting a rotation angle and a rotation angle detection device using the same can be obtained.

なお、以上の説明では、磁気検出ユニット２７や２８と制御手段３５を別体に設け、配線基板２６の配線パターンを介して、制御手段３５と二値化手段３３や切換手段３１と３２を接続した構成として説明したが、これらを一つのチップ部品として一体に形成した構成としても、本発明の実施は可能である。   In the above description, the magnetic detection units 27 and 28 and the control means 35 are provided separately, and the control means 35 and the binarization means 33 and the switching means 31 and 32 are connected via the wiring pattern of the wiring board 26. However, the present invention can also be implemented as a structure in which these are integrally formed as one chip component.

また、以上の説明では、回転体２１に第一の検出体２２を噛合させ、この第一の検出体２２に第二の検出体２３を噛合させた構成の回転角度検出装置について説明したが、背景技術の項で説明したように、回転体２１に第一の検出体２２と第二の検出体２３の両方を噛合させた構成や、あるいは一方の検出体のみを回転体２１に噛合させた構成のものとしても、本発明の実施は可能である。   Moreover, in the above description, although the rotation angle detection apparatus of the structure which made the 1st detection body 22 mesh with the rotary body 21, and made the 2nd detection body 23 mesh with this 1st detection body 22 was demonstrated, As described in the section of the background art, a configuration in which both the first detection body 22 and the second detection body 23 are meshed with the rotating body 21, or only one detection body is meshed with the rotating body 21. The present invention can be implemented even with a configuration.

さらに、以上の説明では、回転体２１や第一の検出体２２、第二の検出体２３の外周に各々平歯車部を形成し、これらが噛合して互いに連動して回転する構成について説明したが、平歯車部以外にも傘歯車等、他の形状の歯車を用いた構成や、あるいは歯車に代えて、回転を伝達できる凹凸部や高摩擦部などを回転体や各検出体の外周に形成し、これによって互いに連動して回転する構成としてもよい。   Furthermore, in the above description, the structure which formed the spur gear part in the outer periphery of the rotary body 21, the 1st detection body 22, and the 2nd detection body 23 respectively, and these meshed | engaged and rotated mutually interlock | cooperated was demonstrated. However, in addition to spur gears, bevel gears and other shapes are used, or instead of gears, irregularities and high friction parts that can transmit rotation are provided on the outer periphery of the rotating body and each detecting body. It is good also as a structure which forms and rotates in response to this mutually.

本発明による磁気検出ユニット及びこれを用いた回転角度検出装置は、温度変化等による誤差がなく、高精度で確実な回転角度の検出が可能なものが得られ、主に自動車のステアリングの回転角度検出等に有用である。   The magnetic detection unit and the rotation angle detection apparatus using the same according to the present invention are capable of detecting a rotation angle with high accuracy and surely without error due to a temperature change or the like. Useful for detection and the like.

２１ 回転体
２１Ａ、２２Ａ、２３Ａ 平歯車部
２１Ｂ 係合部
２２ 第一の検出体
２３ 第二の検出体
２４、２５ 磁石
２６ 配線基板
２７、２８ 磁気検出ユニット
２９、２９Ａ、２９Ｂ、３０、３０Ａ、３０Ｂ 磁気抵抗素子
３１、３１Ａ、３１Ｂ、３２、３２Ａ、３２Ｂ 切換手段
３３ 二値化手段
３４、３６ 抵抗
３５ 制御手段 DESCRIPTION OF SYMBOLS 21 Rotating body 21A, 22A, 23A Spur gear part 21B Engagement part 22 1st detection body 23 2nd detection body 24, 25 Magnet 26 Wiring board 27, 28 Magnetic detection unit 29, 29A, 29B, 30, 30A, 30B magnetoresistive element 31, 31A, 31B, 32, 32A, 32B switching means 33 binarizing means 34, 36 resistance 35 control means

Claims (2)

複数の磁気抵抗素子を放射状に対向させて配列すると共に、この一端に切換手段を各々設け、これらの切換手段を二値化手段に接続した磁気検出ユニット。 A magnetic detection unit in which a plurality of magnetoresistive elements are arranged radially opposite to each other, and switching means is provided at one end thereof, and these switching means are connected to binarization means. ステアリングに連動して回転する回転体と、この回転体に連動して回転する検出体と、この検出体の中央に装着された磁石と、この磁石に対向して配置された請求項１記載の磁気検出ユニットと、この磁気検出ユニットに接続された制御手段からなり、上記制御手段が上記磁気検出ユニットの切換手段を切換え、磁気抵抗素子からの出力信号によって上記回転体の回転角度を検出する回転角度検出装置。 The rotating body that rotates in conjunction with the steering, the detecting body that rotates in conjunction with the rotating body, a magnet mounted in the center of the detecting body, and a magnet that is disposed opposite to the magnet. Rotation comprising a magnetic detection unit and control means connected to the magnetic detection unit, wherein the control means switches the switching means of the magnetic detection unit, and detects the rotation angle of the rotating body by an output signal from the magnetoresistive element. Angle detection device.
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CN110487522A (en) * 2019-07-18 2019-11-22 日立楼宇技术（广州）有限公司 Reliability of Microprocessor test equipment, method and device
JP2020044947A (en) * 2018-09-18 2020-03-26 日立オートモティブシステムズ株式会社 Steering device

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JP2008008233A (en) * 2006-06-30 2008-01-17 Komatsu Ltd Rotating angle sensor

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JP2008008233A (en) * 2006-06-30 2008-01-17 Komatsu Ltd Rotating angle sensor

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Publication number Priority date Publication date Assignee Title
JP2020044947A (en) * 2018-09-18 2020-03-26 日立オートモティブシステムズ株式会社 Steering device
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