JPS6281502A - Rotation angle detector - Google Patents
Rotation angle detectorInfo
- Publication number
- JPS6281502A JPS6281502A JP22245085A JP22245085A JPS6281502A JP S6281502 A JPS6281502 A JP S6281502A JP 22245085 A JP22245085 A JP 22245085A JP 22245085 A JP22245085 A JP 22245085A JP S6281502 A JPS6281502 A JP S6281502A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- rotating
- angle
- rotating shaft
- rotation angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は例えば内燃機関のスロットル弁の回転軸の如く
、微小角度ずつ小刻みに回動させられる回転体の回転角
を検出する目的に好適した回転角検出装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for detecting the rotation angle of a rotating body that is rotated in small increments, such as the rotation shaft of a throttle valve in an internal combustion engine. The present invention relates to a rotation angle detection device.
[従来の技術]
従来の回転角検出方法としては、電気回路に使われるボ
リュームの如き可変抵抗器を回転軸に組付けることが行
われてきたが、摺動部分の耐久性に問題があり作動(t
i頼性に欠けるうえに検出精度の点でも不充分であった
。[Prior Art] The conventional method for detecting the rotation angle has been to attach a variable resistor, such as a volume resistor used in an electric circuit, to the rotating shaft, but there are problems with the durability of the sliding parts, making it difficult to operate. (t
In addition to lacking in reliability, the detection accuracy was also insufficient.
そこで例えば特開昭[56−107119Jにみられる
ように、回転角が検出されるべき回転軸の先端部に平行
磁界を生じさせる永久磁石を取付けること゛によって形
成させた回転する磁界内に、感r/11t’lA子を配
設し、磁界の回転に伴う感磁性素子の出力変化に基づい
て上記の回転角を検知する方法が提案されている。For example, as seen in Japanese Patent Application Laid-Open No. 56-107119J, a permanent magnet that generates a parallel magnetic field is attached to the tip of the rotating shaft whose rotational angle is to be detected. A method has been proposed in which an r/11t'lA element is provided and the above-mentioned rotation angle is detected based on a change in the output of a magnetically sensitive element as the magnetic field rotates.
し発明が解決しようとする問題点1
上記の[特開昭56−107119Jに開示された装置
は、可変抵抗器を使用する方法と異なって計測信号がt
i械的な接触面を通過させられることのないいわゆる非
接触タイプであるので、作動信頼性に欠ける所はないが
、次のような新たな問題が派生している。Problem 1 to be Solved by the Invention Unlike the method using a variable resistor, the above-mentioned device disclosed in JP-A-56-107119J is different from the method using a variable resistor.
Since it is a so-called non-contact type that does not pass through mechanical contact surfaces, there is no lack of operational reliability, but the following new problems have arisen.
即ちインジウム・アンチモナイドなどの半導体またはニ
ッケルなどの強磁性材料製の短冊状体をなず感磁性素子
の艮手力向に流される電流の方向と、回転する平行磁界
の′v11界方向とのなす角度θの変化に応じて、素子
の出力電圧は第5図のグラフに描かれた様に波動し、θ
の値が0の時出力は最小となり、90°の時最人となり
、180°及び270°の時再びそれぞれ最小値または
最大値に達する。回転角情報としての素子の出力電圧は
、磁界の回転角つまり被計測回転軸の回転角の変化に対
しt直線グラフ的に変化することが当然望ましいので、
この装置の場合には、θがO〜90°の値をとる範囲に
おいては図中に(イ)及び(ハ)で示した、0〜25°
及び65〜90°の領域では比例的な回転角検出が行え
ず、符号(ロ)で示したわずかに25〜65°の範囲で
しか装置は比例的計測機能を果してくれないことになり
甚だ不都合である35回転磁界が360°回転する間に
はこのような出力変動の波が2つ現われるh<、第2の
波の部分についても事情は同じであり、また現在の出力
信号が第1と第2のいずれの波の部分に当るかの判別手
段も必要となって来る。In other words, the relationship between the direction of the current flowing in the direction of the force of the magnetically sensitive element and the direction of the rotating parallel magnetic field through a rectangular body made of a semiconductor such as indium antimonide or a ferromagnetic material such as nickel is determined. As the angle θ changes, the output voltage of the element fluctuates as shown in the graph of Figure 5.
When the value of is 0, the output is minimum, when it is 90°, it is maximum, and when it is 180° and 270°, it reaches the minimum or maximum value, respectively. It is naturally desirable that the output voltage of the element as rotation angle information changes in a t-line graph with respect to changes in the rotation angle of the magnetic field, that is, the rotation angle of the rotation axis to be measured.
In the case of this device, in the range where θ takes a value of 0 to 90 degrees, it is 0 to 25 degrees, as shown in (A) and (C) in the figure.
And, proportional rotation angle detection cannot be performed in the range of 65 to 90 degrees, and the device only performs the proportional measurement function in the range of 25 to 65 degrees, which is indicated by the symbol (b), which is extremely inconvenient. While the 35-rotating magnetic field rotates 360 degrees, two waves of such output fluctuations appear. The situation is the same for the second wave part, and the current output signal is A means for determining which part of the second wave the wave falls on is also required.
また計測回転軸の向転変位む1を増巾することなく直接
的に計測するので、微小な回転角を精密に計ることは困
難であった。Furthermore, since the direction displacement of the measurement rotation axis is directly measured without amplification, it is difficult to accurately measure minute rotation angles.
本発明は被計測回転軸のより広い回動範囲内に回って有
効な回転角J1測が行えると共に、必要に応じてより精
密な計測を行うことも可能な磁界検出素子組込み型の回
転角検出装置を提供づることを目的とする。The present invention provides rotation angle detection with a built-in magnetic field detection element that enables effective rotation angle J1 measurement by rotating within a wider rotation range of the rotating shaft to be measured, and also enables more precise measurement if necessary. The purpose is to provide equipment.
[問題点を解決するための手段]
上記の目的を達成するために本発明の回転角検出装置は
、外力によって回動させられる被計測回転軸と、平行磁
界を生ずる磁石を、その磁界方向が回転体の回転軸方向
に対して直交するようにして該回転体に取付けた回転磁
界発生体と、前記被計測回転軸の回転角を縮小または拡
大さけて前記回転トn界発生体の回転軸に伝えるための
回転動伝達手段と、前記平行磁界の方向を検知すること
によって前記被計測回転軸の回転角を知るための、前記
回転磁界内に設置した磁界検出素子と、該磁界検出素子
の出力信号に基づいて前記被計測回転軸の回転角を口定
するための処理回路とからなる構成を採用した。[Means for Solving the Problems] In order to achieve the above object, the rotation angle detection device of the present invention connects a rotating shaft to be measured that is rotated by an external force and a magnet that generates a parallel magnetic field so that the direction of the magnetic field is A rotating magnetic field generator attached to the rotating body so as to be perpendicular to the direction of the rotating axis of the rotating body, and a rotating magnetic field generator attached to the rotating body so as to be perpendicular to the direction of the rotating axis of the rotating body, and a rotating magnetic field generating body attached to the rotating body so as to be perpendicular to the direction of the rotating axis of the rotating body. a rotational motion transmission means for transmitting the rotational motion to the rotating magnetic field; a magnetic field detection element installed in the rotating magnetic field for detecting the rotation angle of the rotation axis to be measured by detecting the direction of the parallel magnetic field; A configuration including a processing circuit for determining the rotation angle of the rotation axis to be measured based on the output signal is adopted.
[作用および発明の効果]
F記の如き構成を備えた本発明装置は、被計測回転軸が
外力によって回動させられると、この回転軸と回転磁界
発生体の回転軸との間に介在させた回転動伝達手段が、
被計測回転軸の現実の回転角を縮小させて回転磁界発生
体の回転軸に伝える(例えば前者が90°回転した時に
、後者は例えばその1/3に当る30°だけ回動させら
れる)。又は回転動伝達手段を設計変更すれば、現実の
回転角が拡大されて伝えられる(例えば前斉が回転角に
して1°回動した時、後者は例えばその10(8の10
°回動させられる)。[Function and Effects of the Invention] The device of the present invention having the configuration as described in F is such that when the rotating shaft to be measured is rotated by an external force, the rotating shaft is interposed between the rotating shaft and the rotating shaft of the rotating magnetic field generator. The rotary motion transmission means is
The actual rotation angle of the rotation axis to be measured is reduced and transmitted to the rotation axis of the rotating magnetic field generator (for example, when the former rotates 90 degrees, the latter is rotated by 30 degrees, which is one-third of the rotation angle). Alternatively, if the design of the rotational motion transmission means is changed, the actual rotational angle can be expanded and transmitted (for example, when the front rotation angle is rotated by 1 degree, the latter is
° rotated).
従って回転動伝達手段が例えば減速比1/3といった回
転角縮小側に設語されている場合には、被計測回転軸が
90°回動した時には、回転磁界発生体はその1/3の
30’回動させられることになり、その30°回動する
領域を磁界検出素子の出力が直線的に変化する領域内に
合わせるようにすると、有効な比例的51測が行える被
計測回転軸の回転角範囲が3倍に拡大されることになる
。Therefore, if the rotational motion transmission means is designed to reduce the rotational angle, such as a reduction ratio of 1/3, when the rotating shaft to be measured rotates 90 degrees, the rotating magnetic field generator will be 'The rotation of the rotation axis to be measured can be made by aligning the region of rotation by 30 degrees within the region where the output of the magnetic field detection element changes linearly, allowing effective proportional 51 measurement. The angular range will be expanded three times.
また回転動伝達手段が例えば増速比10といった回転角
拡大側に設計されている場合には、被i;l測同転軸の
回動角度が微小であってム回転磁界発生体は大きく回動
するので、それに伴・う磁界検出素子の出力変化の度合
も大きくなり、従ってδ1重粘度を充分に向上させるこ
とができる。In addition, if the rotational motion transmission means is designed to increase the rotational angle, such as a speed increase ratio of 10, the rotational angle of the co-rotating shaft to be measured is minute and the rotating magnetic field generating body rotates greatly. Since the magnetic field detecting element moves, the degree of change in the output of the magnetic field detecting element increases accordingly, and therefore the δ1 heavy viscosity can be sufficiently improved.
し実施例]
以下に本発明装置の具体的な構成を、内燃機関のスロッ
トル弁開度の検出を目的とする場合を例にとって第1図
及び第2図を参照しながら以下に説明する。Embodiments] A specific configuration of the device of the present invention will be described below with reference to FIGS. 1 and 2, taking as an example the case where the device is intended to detect the throttle valve opening of an internal combustion engine.
1は被計測回転軸としてのスロツI〜ルシャフト、30
はこのシャフトに固着させたスロットル弁の弁体、31
はスロットルチャンバー、32はスロワ]・ルシャフト
1の軸受である。1 is a slot shaft I to a shaft to be measured, 30
is the valve body of the throttle valve fixed to this shaft, 31
32 is a throttle chamber, and 32 is a bearing for the thrower shaft 1.
33は筒状体をなす装置ケーシングの本体部分、33A
はケーシングの底板、33Bはケーシングの取付は用フ
ランジ状部であって、硬質合成樹脂または金属の一体成
形体からなる。33Cは嵌合式のケーシング蓋、34は
蓋33Cの密閉用パツキンである。33 is the main body portion of the device casing which is a cylindrical body; 33A;
33B is a bottom plate of the casing, and 33B is a flange-like portion for attaching the casing, which is made of a hard synthetic resin or metal integrally molded body. 33C is a fitting type casing lid, and 34 is a gasket for sealing the lid 33C.
このケーシングはそのフランジ状部33Bに挿通させた
取付用ビス35によってスロットルチャンバー31に螺
着される。36はこの取付は部の気密保持用のパツキン
である。This casing is screwed onto the throttle chamber 31 with a mounting screw 35 inserted through the flange-shaped portion 33B. Reference numeral 36 indicates a gasket for keeping the part airtight.
2は平行磁界発生用磁石であって、この実施例ではその
横断面図としての第2図に示されたように円筒状に成形
された強磁性材料の内周面に直径方向に2極着磁を行う
ことによって作成されている。6はその外周面に嵌着さ
せた筒状の磁気鴻閉材である。Reference numeral 2 denotes a magnet for generating a parallel magnetic field, and in this embodiment, as shown in the cross-sectional view of FIG. It is created by doing magnetism. Reference numeral 6 denotes a cylindrical magnetic fastener fitted onto the outer peripheral surface.
4は平行磁界発生用磁石2の取付基盤をなす回転軸であ
って、ケーシング底4fi33Aに設けた穿孔に嵌着さ
せた軸受7にはめ込まれており、回転軸4に磁石2をそ
の平行磁界方向が回転軸4の軸方向と直交するようにし
て取ト1けることによって回転磁界発生体が形成されて
いる。3は被計測回転軸としてのス[1ツトルシヤフト
1の一端を装置ケーシング33内に突出させた部分に、
このシャフトに対して同軸的に取付けた駆動側歯車であ
って、シャツ1〜1自身に切削加工を施して形成させる
かまたは別個に作成したしのをシャフト1に嵌着させる
。Reference numeral 4 denotes a rotating shaft that forms a mounting base for the parallel magnetic field generating magnet 2, and is fitted into a bearing 7 fitted into a hole provided in the bottom of the casing 4fi33A. A rotating magnetic field generating body is formed by taking the shaft 1 so that it is perpendicular to the axial direction of the rotating shaft 4. 3 is a rotating shaft to be measured;
A drive side gear is attached coaxially to the shaft, and is formed by cutting the shirts 1 to 1 themselves, or is made separately and is fitted onto the shaft 1.
5は回転磁界発生体の回転軸4に同軸的に取付りた、被
計測回転軸1の同転角縮小用爾中であって、この歯車に
かみ合わされる駆動側歯車3によって伝えられる被計測
回転@1の回転動を所定の減速比をもって回転軸4に伝
えることにって、回転磁界発生体を被計測回転軸1の回
動角度より6ある一定の割合を:6つて減少された角用
だけ回動ざ眩る役割を果たす。この回転角度縮小用歯車
56回転軸4と一体的に形成させてしよいし、別個に作
成したうえ回転軸4に嵌着させてもよい。また被計測回
転軸1に犬歯数の歯車を、回転磁界発生体の回転軸4に
小歯教の山車を嵌着させてこの両歯中が11^み合わさ
れるように回転動伝達手段を構成ずれば、被泪測回転!
Ill 1の回動の角度を増大させて回転軸4に伝える
こともできる、。Reference numeral 5 denotes a co-rotation angle reduction unit for the rotating shaft 1 to be measured, which is attached coaxially to the rotating shaft 4 of the rotating magnetic field generator, and the measuring target transmitted by the drive side gear 3 meshed with this gear. By transmitting the rotational motion of rotation @ 1 to the rotating shaft 4 with a predetermined reduction ratio, the rotating magnetic field generator has an angle reduced by a certain ratio of 6 to the rotation angle of the rotating shaft 1 to be measured. It plays the role of rotating and dazzling. The rotation angle reduction gear 56 may be formed integrally with the rotation shaft 4, or may be formed separately and fitted onto the rotation shaft 4. In addition, a gear with a number of canine teeth is fitted on the rotating shaft 1 to be measured, and a small toothed float is fitted on the rotating shaft 4 of the rotating magnetic field generator, so that the rotational motion transmission means is configured such that the inside of both teeth are meshed 11^. If it shifts, the subject will be rotated!
It is also possible to increase the angle of rotation of Ill 1 and transmit it to the rotation axis 4.
20は磁界検出素子であって、絶縁性包埋材21に埋設
させたうえ回転磁界中に位置させられるようにして装置
ケーシングの中仕切板33Dに取付けられている。22
.23.24はそれぞれ素r20の入力端子、出力端子
およびアース端子に接続されたリード線、25は装置ケ
ーシングに取イ]けられた配線基盤、26は素子20の
出力信号に基づいて被計測回転+l11の回転角を0定
するための処理回路の構成部品、27はハーネスである
。もつとも素子20の出力信号は単に増巾させるのみで
たりる使用方法も司能である。Reference numeral 20 denotes a magnetic field detection element, which is embedded in the insulating embedding material 21 and attached to the partition plate 33D of the device casing so as to be positioned in the rotating magnetic field. 22
.. 23 and 24 are lead wires connected to the input terminal, output terminal and ground terminal of the element r20, 25 is a wiring board installed in the device casing, and 26 is a rotation to be measured based on the output signal of the element 20. Component 27 of the processing circuit for fixing the rotation angle of +l11 to zero is a harness. Of course, it is also possible to simply amplify the output signal of the element 20.
vtk!1Tll検出累子20の一例として強磁性A9
膜抵抗素子の具体的構造を第3図にまたその結線を第4
図に示した。40は磁気抵抗効果の大ぎなニッケル合金
などを蒸着方法その他の方法によりガラスv!盤43の
面上に薄膜状にイ(1着させたうえ、パターニングを行
って形成させた、短欄状のパターンをなず磁気検出部で
ある。41は電極部分、42は電極端子のはIυだイ1
(〕個所、44は保護膜、45は塗料、そ()で46は
素子のアセンブリークースCある。vtk! As an example of the 1Tll detection element 20, ferromagnetic A9 is used.
The specific structure of the membrane resistance element is shown in Figure 3, and its wiring is shown in Figure 4.
Shown in the figure. 40 is glass v! by vapor deposition method or other method of nickel alloy with large magnetoresistive effect. A thin film is deposited on the surface of the board 43 and patterned to form a short column pattern, which is a magnetic detection part. 41 is an electrode part, and 42 is an electrode terminal part. Iυdai1
44 is a protective film, 45 is a paint, and 46 is an assembly section C of the element.
このような構造を備えた磁界検出木F20の磁気検出部
40の知柵艮手乃向に電流Iを流すと共にこの検出部4
0を平行磁界内に位置させると、電流1とt社界ト1の
各々の方向のなす角度を0、そして素:f、 20の抵
抗値を比抵抗ρで表1と、ρ(0)−ρ0−Δsin
2 θの関係式が成り立ら、角θの変化につれて磁界検
出素子20の出力電圧は第5図のグラフに描かれたよう
に波動状をなして変動する。図中のVllとV[はそれ
ぞれ最大及び最小出力電圧をまた上記のρOは雇人出力
時におれる比抵抗を表している。A current I is passed in the direction of the magnetic detection section 40 of the magnetic field detection tree F20 having such a structure, and this detection section 4
When 0 is located in a parallel magnetic field, the angle formed by each direction of current 1 and t-field 1 is 0, and the resistance value of element: f, 20 is expressed as specific resistance ρ in Table 1, and ρ(0) −ρ0−Δsin
2 θ holds true, and as the angle θ changes, the output voltage of the magnetic field detection element 20 fluctuates in a wave-like manner as depicted in the graph of FIG. Vll and V[ in the figure represent the maximum and minimum output voltages, respectively, and ρO above represents the specific resistance at the time of full output.
51ど52はそれぞれ大ベンチユリと小ベンチユリ、5
3はフロート室、54は主ジェツト、55は燃料溜、5
6は空気ブリード管、57は主空気ジツエト、58は主
ノズルである。51 and 52 are large bench lily and small bench lily, respectively.
3 is a float chamber, 54 is a main jet, 55 is a fuel reservoir, 5
6 is an air bleed pipe, 57 is a main air jet, and 58 is a main nozzle.
次に上記実施例装置の作動を説明する。内燃機関が自動
車の駆動用エンジンである場合には、アクセルペダルの
踏込み動作がリンク機構などを介してスロットルシャフ
ト1に伝達されペダルの踏込み度合に比例してスロット
ルシャフト1、従ってスロットル弁の弁体30が同方向
に回jhさ往られることになる。エンジンを電了式燃利
自動噴躬装置などを用いて最良の運転状態に制御しよう
とする場合には、このスロットル開度は一つの重要な制
御関与情報となるので連続的に精密に監視する必要があ
る。Next, the operation of the above embodiment device will be explained. When the internal combustion engine is a driving engine for an automobile, the depression of the accelerator pedal is transmitted to the throttle shaft 1 via a link mechanism, etc., and the throttle shaft 1, and thus the valve body of the throttle valve, is transmitted in proportion to the degree of pedal depression. 30 will be turned in the same direction. When trying to control the engine to the best operating condition using an automatic fuel injection system, etc., the throttle opening is important information related to control, so it must be continuously and precisely monitored. There is a need.
スロットルシャフト1が上述の如くして回動させられる
と、このシャット1の先端に切削加工を施して形成され
ている駆動側歯車3の回動に伴って、この歯車3にかみ
合っている回転角縮小用歯車5が設定された減速比例え
ばこの実施例では3:1の減速比をもって回動さられる
ので、歯車5を同軸的に取付けである回転磁界発生体の
回転軸4は、スロットルシャフト1が回転角にして3°
回動したどすればその1/3の回転角つまり16だけ回
動さUられる。それにともなって回転磁界発生体に取付
けられている円筒形の平行磁界発生用磁石2ら磁界方向
をその回転面上で角度1°だけ偏向させられる。スロッ
トルシャフト1と回転磁界発生体の回転軸4との間のこ
のような連動関係について第6図を参照しながら説明す
ると、駆動側歯車3が同軸的に取付けられているスロッ
トルシャフト1が角度φ°だ【)回動すると、被動側の
回転角縮小用歯車5が同軸的に取tHJられている回転
磁界発生体の回転軸4は回転角にしてθ°回動させられ
る。そしてこの実施例では小歯車3に対する大歯車5の
歯数比は3に設定されているので、スロットルシャフト
1がφ°回動させられることによって回転軸4は1/3
φ°(−θ°)回転覆るという関係に置かれる。When the throttle shaft 1 is rotated as described above, as the drive side gear 3, which is formed by cutting the tip of the shut 1, rotates, the rotation angle that meshes with this gear 3 changes. Since the reduction gear 5 is rotated with a set reduction ratio, for example, 3:1 in this embodiment, the rotating shaft 4 of the rotating magnetic field generator to which the gear 5 is coaxially attached is connected to the throttle shaft 1. is the rotation angle of 3°
If it rotates, it will be rotated by 1/3 of that rotation angle, that is, 16 degrees. Accordingly, the direction of the magnetic field from the cylindrical parallel magnetic field generating magnet 2 attached to the rotating magnetic field generating body is deflected by an angle of 1° on its rotating surface. The interlocking relationship between the throttle shaft 1 and the rotating shaft 4 of the rotating magnetic field generator will be explained with reference to FIG. When the rotary shaft 4 of the rotating magnetic field generator, on which the rotation angle reduction gear 5 on the driven side is coaxially mounted, is rotated by θ°. In this embodiment, the gear ratio of the large gear 5 to the small gear 3 is set to 3, so when the throttle shaft 1 is rotated by φ°, the rotating shaft 4 is rotated by 1/3.
They are placed in the relationship of rotating and overlapping by φ° (-θ°).
回転磁界発生体には前述のようにして平行磁界発生用磁
石2が取付けられているので、平行磁界の方向1」もま
た同方向に同じ角度だけ隔向さぜられる。従ってスロッ
トル弁の開度が0°であってスロットルシャフト1の回
転角φもOoである時に、磁界検出素子20を流れる電
流方向Iが平行磁界の方向Hに対して平行に置かれるよ
うな位置関係をもって素子20を回転磁界内に設置させ
ることによって、第5図および第7図に模式的に説明さ
れているようにスロットルシャフト1がφ°回動させら
れるのに伴って、磁界検出素子20内を流れる電流方向
1に対して平行磁界方向1」は角1/3θ°(=θ°)
偏向させられることになる。Since the parallel magnetic field generating magnet 2 is attached to the rotating magnetic field generator as described above, the direction 1'' of the parallel magnetic field is also shifted in the same direction by the same angle. Therefore, when the opening degree of the throttle valve is 0° and the rotation angle φ of the throttle shaft 1 is also Oo, the position is such that the direction I of the current flowing through the magnetic field detection element 20 is parallel to the direction H of the parallel magnetic field. By locating the element 20 in a rotating magnetic field, the magnetic field sensing element 20 is rotated by φ° as the throttle shaft 1 is rotated by φ° as schematically illustrated in FIGS. 5 and 7. The magnetic field direction 1 parallel to the current direction 1 flowing inside is an angle 1/3θ° (=θ°)
It will be deflected.
そしで■に述べたように磁界検出素子20に通電しなが
ら平行磁界を及ぼした時、磁気抵抗を受けた素子20の
出力電圧は第5図にみられるように角θがO’ (及び
180°)の時最小値V[にまで低下し、90°(及び
270°)の時14人値のVHにまで上背ツ″るといっ
た波形を描いて変りjするので、磁界検出素子20の出
力電圧の変化を検知することによって平行磁界の回動角
θ従って回転磁界発生体の回転軸4の回動角θを知るこ
とができる。もっともこの場合出力電圧Vは回動角0の
変化に対してほぼ直線的グラフ的関係のもどに変O」シ
ないと、回動角θの算定手段が複雑化して実用に耐えな
いので、出力電圧Vを回動角θの検知情報として有効に
利用できる領域は、第5図から理解されるようにOがほ
ぼ25〜65°の値をとる約406範囲に限定されるは
ずである。Then, as described in (2), when a parallel magnetic field is applied to the magnetic field detection element 20 while energizing it, the output voltage of the element 20 that has received magnetic resistance will be such that the angle θ is O' (and 180 The output of the magnetic field detection element 20 changes as it depicts a waveform that decreases to the minimum value V[ when the angle is 90° (and 270°) and rises to the 14-person value VH. By detecting the change in voltage, it is possible to know the rotation angle θ of the parallel magnetic field and therefore the rotation angle θ of the rotating shaft 4 of the rotating magnetic field generator.However, in this case, the output voltage V is If the relationship is not changed back to an almost linear graph, the means for calculating the rotation angle θ will become complicated and cannot be put to practical use. Therefore, the output voltage V can be effectively used as detection information for the rotation angle θ. The area should be limited to a range of approximately 406 where O takes values approximately from 25 to 65 degrees, as can be seen from FIG.
しかし上記実施例装置において検知したい回転角は、実
は回転磁界発生体の回転軸4のそれではなくて、この回
転軸4と回転動伝達手段を介して連動関係に置かれてい
るスロットルシャフト1の回転角φである。既述の如く
この連動関係とは、従動軸としての回転軸4が30°回
動させられた時には、駆動軸であり]つ被計測回転軸と
してのスロットルシャフト1はその3倍の90°回転し
ているという、いわば被計測同転輪の回転角を縮小させ
て回転磁界発生体の回転軸に伝える関係である。However, the rotational angle to be detected in the above embodiment device is not actually that of the rotational shaft 4 of the rotating magnetic field generator, but the rotation of the throttle shaft 1, which is placed in an interlocking relationship with the rotational shaft 4 via the rotational motion transmission means. The angle is φ. As mentioned above, this interlocking relationship means that when the rotating shaft 4 as the driven shaft is rotated by 30 degrees, the throttle shaft 1 as the rotating shaft to be measured is rotated by 90 degrees, which is three times that rotation. This is a relationship in which the rotation angle of the co-rotating wheels to be measured is reduced and transmitted to the rotating shaft of the rotating magnetic field generator.
そこで第6図を参照しながら装置の作動説明をつづける
と、自動車のアクセルペダルを踏込むことににってスロ
ットル弁を全開から全開に向けて回動さUて行くと、ス
[lットルシャフト1の回動角φはO°→90°へと増
大させられるが、平行磁界発生用磁石2が数句けられて
いる回転磁界発生体の回転@4は角φの1/3の0°→
30°だけしか回動されないことになる。スロットルシ
ャツ1〜1がφ°回動した時、回転軸4がそれに連動し
て回動させられる角度θは図示の関係にある。つまり第
6図のグラフを手助けとして理解されることは、スロッ
トルシャフト1の回動角φが756→195゜の範囲内
に納まっている限り、磁界検出素子20の出力電圧Vは
ほぼ直線関係を保って連続的に変化するという事実であ
る。従ってスロワ1−ル弁が仝閉の時、磁界検出素子2
0の電流方向Iと平行磁界方向]」とのなす角度が25
°となるように素子20の取イ」け方向を設定して置く
ことによって、スロットルシャフト1がO→90° (
φとしては25°→115°)の範囲で回動さぜ゛られ
る間において、Vifl界検出素子20の出力電圧を連
続的に計測することによってスロットルシャフト1の回
転角を比例的に簡単且つ正確に知ることができる、。Continuing the explanation of the operation of the device with reference to FIG. The rotation angle φ of is increased from 0° to 90°, but the rotation of the rotating magnetic field generator with several parallel magnetic field generating magnets 2 is increased from 0°, which is 1/3 of the angle φ.
It will only be rotated by 30 degrees. When the throttle shirts 1 to 1 rotate by φ°, the angle θ at which the rotating shaft 4 is rotated in conjunction with the rotation has the relationship shown in the drawing. In other words, what can be understood with the help of the graph in FIG. 6 is that as long as the rotation angle φ of the throttle shaft 1 is within the range from 756 to 195 degrees, the output voltage V of the magnetic field detection element 20 has an almost linear relationship. It is a fact that it changes continuously. Therefore, when the throttle valve 1 is closed, the magnetic field detection element 2
The angle between the current direction I at 0 and the parallel magnetic field direction] is 25
By setting the orientation of the element 20 so that
By continuously measuring the output voltage of the Vifl field detection element 20 while the throttle shaft 1 is being rotated in the range of 25° → 115° (φ), the rotation angle of the throttle shaft 1 can be easily and accurately proportionally measured. You can know.
これに対して本発明装置と同様に磁界検出素子の電気出
力特性を利用した従来の回転角検出装置が連続pつ直線
的に検知することのできる回転角範囲は第5図に示され
たにうにわずかに約406 と本発明による上記実施例
装置の173にすき゛ないことは既述の通りである。On the other hand, the rotation angle range that can be detected continuously and linearly by the conventional rotation angle detection device that uses the electric output characteristics of the magnetic field detection element like the device of the present invention is shown in FIG. As already mentioned, the number of digits is only about 406, which is slightly less than 173 of the device of the above embodiment according to the present invention.
上記実施例においては被計測回転軸の回転角を縮小させ
て回転磁界発生体の回転軸に伝えるための回転動伝達手
段として歯数比3の1組の減速歯車が使われているが、
歯数比3は1つの設置i値にすぎず、この値は必要に応
じて適宜に決定り゛ればよい。又歯車以外の回転動伝達
手段例えばタイミングベルトを利用してもよいし、回転
体の全体構成を様々に設h]変史できることも勿論であ
る。In the above embodiment, a set of reduction gears with a tooth ratio of 3 is used as a rotational motion transmission means for reducing the rotation angle of the rotating shaft to be measured and transmitting it to the rotating shaft of the rotating magnetic field generator.
The tooth number ratio 3 is just one installed i value, and this value may be determined as appropriate as required. It goes without saying that rotational motion transmission means other than gears, such as a timing belt, may be used, and the overall structure of the rotating body may be modified in various ways.
そして既に説明したように回転動伝達手段として減速南
中機構に代えて増速歯巾機構を採り入れれば被計測回転
軸の微小な回動角を拡大して回転磁界発生体に伝えられ
るので、それに伴って磁界検出素子の出力を拡大さゼて
取り出す効果が得られることになり、装置の31側精度
を飛躍的に向上させることも可能となる。As already explained, if a speed-increasing tooth width mechanism is used instead of the deceleration/sinking mechanism as a rotational motion transmission means, the minute rotational angle of the rotating shaft to be measured can be enlarged and transmitted to the rotating magnetic field generator. Accordingly, the output of the magnetic field detection element can be expanded and taken out, and the accuracy on the 31 side of the device can be dramatically improved.
また、第5図および第6図にみられるように回転角θと
出力電圧Vとはヒステリシスをもったグラフを描≦関係
にあるが、本発明装置ではη1測値に表れるこのヒステ
リシスの影響を減縮させる効果も備えている。Furthermore, as shown in Figs. 5 and 6, the rotation angle θ and the output voltage V have a relationship of ≦with hysteresis, but the device of the present invention can eliminate the influence of this hysteresis that appears in the measured value of η1. It also has a reducing effect.
さらに本発明装置に用いられている平行磁界発生用磁石
は円筒状強磁性体の内周面に2極着磁して形成されてい
ると共に、その外周面に磁気鴻閉筒が嵌着されているの
で、磁石の磁気漏洩を阻止する効果に加えて外界からの
磁気の影響を著しく低く押えられて、装置の51側感度
がこのような面からも高められる。また円筒形であるが
故に、回転軸4と同軸に設定することが容易で且つ磁界
検出素子20を円筒の中心に設定することも容易である
。Furthermore, the parallel magnetic field generating magnet used in the device of the present invention is formed by magnetizing the inner circumferential surface of a cylindrical ferromagnetic material with two poles, and a magnetic locking tube is fitted onto the outer circumferential surface of the cylindrical ferromagnetic material. Therefore, in addition to the effect of preventing magnetic leakage of the magnet, the influence of magnetism from the outside world can be suppressed to a significantly low level, and the sensitivity of the device on the 51 side is increased from this aspect as well. Moreover, since it is cylindrical, it is easy to set it coaxially with the rotating shaft 4, and it is also easy to set the magnetic field detection element 20 at the center of the cylinder.
本発明装置の使途は勿論上記実施例に限られることなく
、各種の計測装置の計測手段、各種自動闘械の作動制御
手段、各種の輸送機の走行制御手段などとして活用する
ことができる。The use of the device of the present invention is of course not limited to the above-mentioned embodiments, but can be utilized as a measuring means of various measuring devices, an operation control means of various automatic fighting machines, a running control means of various transportation machines, etc.
第1図は本発明装置を内燃機関のス[1ツト・ル弁のス
ロットルシャツ1−に組付けた実施例の側断面図、第2
図はこの装置に組込まれた平行磁界発生用磁石の横断面
図、第3図と第4図は磁界検出素子の具体的構成を例示
した部分破断斜視図とその結線図、第5図は従来の回転
角検出装置における磁界検出素子中を流れる電流方向と
平行磁界の方向どがなす角度θと、この素子の出ツノ7
Ui圧Vとの相関グラフ、第6図は本発明による回転角
検出装置における、被計測軸の回転角φに対づる素子の
出力電圧■の値の相関グラフである。Fig. 1 is a side sectional view of an embodiment in which the device of the present invention is assembled to a throttle shirt 1- of a throttle valve of an internal combustion engine;
The figure is a cross-sectional view of the parallel magnetic field generating magnet incorporated in this device, Figures 3 and 4 are partially cutaway perspective views and their wiring diagrams illustrating the specific configuration of the magnetic field detection element, and Figure 5 is the conventional The angle θ formed by the direction of the current flowing in the magnetic field detection element and the direction of the parallel magnetic field in the rotation angle detection device, and the angle θ of this element
FIG. 6 is a correlation graph of the value of the output voltage (■) of the element with respect to the rotation angle φ of the shaft to be measured in the rotation angle detection device according to the present invention.
Claims (1)
磁界を生ずる磁石を、その磁界方向が回転体の回転軸方
向に対して直交するようにして該回転体に取付けた回転
磁界発生体と、 前記被計測回転軸の回転角を縮小または拡大させて前記
回転磁界発生体の回転軸に伝えるための回転動伝達手段
と、 前記平行磁界の方向を検知することによって前記被計測
回転軸の回転角を知るための、前記回転磁界内に設置し
た磁界検出素子と、 該磁界検出素子の出力信号に基づいて前記被計測回転軸
の回転角を算定するための処理回路とからなる回転角検
出装置。 2)前記回転動伝達手段は、前記被計測回転軸と、前記
回転磁界発生体の回転軸とにそれぞれ取付けられて相互
にかみ合う、減速用または増速用の少なくとも2個の歯
車の組合わせからなることを特徴とする特許請求の範囲
第1項記載の回転角検出装置。 3)前記平行磁界発生用磁石は、円筒状磁性体の内周面
の直径方向に2極着磁を行って形成されていることを特
徴とする特許請求の範囲第1項または第2項記載の回転
角検出装置。[Claims] 1) A rotating shaft to be measured that is rotated by an external force and a magnet that generates a parallel magnetic field are attached to the rotating body so that the direction of the magnetic field is perpendicular to the direction of the rotating axis of the rotating body. a rotating magnetic field generating body; a rotational motion transmitting means for reducing or enlarging the rotational angle of the rotating shaft to be measured and transmitting the rotational motion to the rotating shaft of the rotating magnetic field generating body; and detecting the direction of the parallel magnetic field. A magnetic field detection element installed in the rotating magnetic field for determining the rotation angle of the rotation axis to be measured; and a processing circuit for calculating the rotation angle of the rotation axis to be measured based on the output signal of the magnetic field detection element. A rotation angle detection device consisting of: 2) The rotational motion transmission means is a combination of at least two gears for deceleration or speed increase, which are respectively attached to the rotation shaft to be measured and the rotation shaft of the rotating magnetic field generator and mesh with each other. A rotation angle detection device according to claim 1, characterized in that: 3) The parallel magnetic field generating magnet is formed by bipolar magnetization in the diametrical direction of the inner peripheral surface of a cylindrical magnetic body, according to claim 1 or 2. rotation angle detection device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22245085A JPS6281502A (en) | 1985-10-04 | 1985-10-04 | Rotation angle detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22245085A JPS6281502A (en) | 1985-10-04 | 1985-10-04 | Rotation angle detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6281502A true JPS6281502A (en) | 1987-04-15 |
Family
ID=16782595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22245085A Pending JPS6281502A (en) | 1985-10-04 | 1985-10-04 | Rotation angle detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6281502A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01129613U (en) * | 1988-02-17 | 1989-09-04 | ||
JP2007256250A (en) * | 2006-02-23 | 2007-10-04 | Denso Corp | Rotation angle detecting device |
JP2011132926A (en) * | 2009-12-25 | 2011-07-07 | Honda Motor Co Ltd | Rotational angle sensor mounting structure and variable valve gear for internal combustion engine using the structure |
CN104422386A (en) * | 2013-08-27 | 2015-03-18 | 阿尔卑斯电气株式会社 | Rotation detector |
-
1985
- 1985-10-04 JP JP22245085A patent/JPS6281502A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01129613U (en) * | 1988-02-17 | 1989-09-04 | ||
JP2007256250A (en) * | 2006-02-23 | 2007-10-04 | Denso Corp | Rotation angle detecting device |
JP4607049B2 (en) * | 2006-02-23 | 2011-01-05 | 株式会社デンソー | Rotation angle detector |
JP2011132926A (en) * | 2009-12-25 | 2011-07-07 | Honda Motor Co Ltd | Rotational angle sensor mounting structure and variable valve gear for internal combustion engine using the structure |
CN104422386A (en) * | 2013-08-27 | 2015-03-18 | 阿尔卑斯电气株式会社 | Rotation detector |
CN104422386B (en) * | 2013-08-27 | 2017-04-12 | 阿尔卑斯电气株式会社 | Rotation detector |
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