JPS6333646B2 - - Google Patents
Info
- Publication number
- JPS6333646B2 JPS6333646B2 JP10966880A JP10966880A JPS6333646B2 JP S6333646 B2 JPS6333646 B2 JP S6333646B2 JP 10966880 A JP10966880 A JP 10966880A JP 10966880 A JP10966880 A JP 10966880A JP S6333646 B2 JPS6333646 B2 JP S6333646B2
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- effect element
- optic effect
- magnet
- optical fiber
- 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.)
- Expired
Links
- 230000000694 effects Effects 0.000 claims description 19
- 239000013307 optical fiber Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000005389 magnetism Effects 0.000 claims description 4
- 229910001940 europium oxide Inorganic materials 0.000 description 4
- AEBZCFFCDTZXHP-UHFFFAOYSA-N europium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Eu+3].[Eu+3] AEBZCFFCDTZXHP-UHFFFAOYSA-N 0.000 description 4
- 229910016629 MnBi Inorganic materials 0.000 description 2
- KYAZRUPZRJALEP-UHFFFAOYSA-N bismuth manganese Chemical compound [Mn].[Bi] KYAZRUPZRJALEP-UHFFFAOYSA-N 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/486—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by photo-electric detectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Optical Transform (AREA)
Description
【発明の詳細な説明】
本発明は車輪の回転速度を光信号を用いて検出
する車速センサに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle speed sensor that detects the rotational speed of a wheel using an optical signal.
自動車の信号伝送系は、現在、電気信号をワイ
ヤーハーネス（組電線）を使つて伝送する方式が
採用されているが、近年自動車のエレクトロニク
ス化が進むにつれて多重伝送が不可能なワイヤー
ハーネスでは多大の量を必要とするため重量が嵩
み車輌重量、燃費等に悪影響を及ぼすに到つてい
る。このことは、自動車の速度を検出し、これに
基づいて車速メータやESC装置（電子制御式スキ
ツドコントロール装置）更にはオートドアロツク
機構を作動させる車速センサ系においても同様で
ある。この車速センサは、従来トランスミツシヨ
ン部分からデフ側の回転をとり出し、電気的に伝
送されるものである。そして、これらの信号伝
送・検出手段にも上述の軽量化についての問題並
びに電磁誘導雑音等の問題を有している。 Currently, the signal transmission system of automobiles uses a method of transmitting electrical signals using a wire harness (wire assembly), but as automobiles have become more electronic in recent years, wire harnesses that cannot perform multiplex transmission have become very expensive. Since a large amount of fuel is required, the weight increases, which has an adverse effect on vehicle weight, fuel efficiency, etc. This also applies to vehicle speed sensor systems that detect the speed of a vehicle and operate a vehicle speed meter, an ESC device (electronic skid control device), and even an automatic door lock mechanism based on the detected speed. This vehicle speed sensor conventionally extracts the rotation of the differential side from the transmission part and transmits it electrically. These signal transmission/detection means also have the above-mentioned problems regarding weight reduction and problems such as electromagnetic induction noise.
一方、光信号を利用する伝送系は軽量且つ電気
的外因の影響を受けないことから、電気的伝送路
に比べて軽量化・安定性の上から好適であり、こ
のため、信号伝送系の光フアイバ化の一環として
改善が望まれる。 On the other hand, transmission systems that use optical signals are lightweight and unaffected by electrical external factors, making them more suitable for light weight and stability than electrical transmission lines. Improvements are desired as part of fiber conversion.
本発明は、光フアイバを利用した車速センサを
提供しようとするもので、その構成は車輪の回転
速度に応じて回転する回転板上にマグネツトを設
ける一方、磁気を受けて光を透過ないし遮断する
磁気光学効果素子を光フアイバの伝送路に介設
し、車輪の回転速度に応じて上記マグネツトが上
記磁気光学効果素子の前方を断続的に通過するよ
う磁気光学効果素子を回転するマグネツトが描く
円周上に向けて対置させたことを特徴とする。 The present invention aims to provide a vehicle speed sensor using an optical fiber, and its structure is such that a magnet is provided on a rotary plate that rotates according to the rotational speed of a wheel, and receives magnetism to transmit or block light. A magneto-optic effect element is interposed in a transmission path of an optical fiber, and a circle drawn by a magnet that rotates the magneto-optic effect element such that the magnet passes intermittently in front of the magneto-optic effect element in accordance with the rotational speed of a wheel. It is characterized by being placed facing toward the circumference.
以下に本発明の実施例を図面に基づいて詳細に
説明する。 Embodiments of the present invention will be described in detail below based on the drawings.
本発明の車速センサは第１図に示すように車輪
の回転速度に応じて回転する回転円板１が、該回
転円板１を覆うケース２に収納され上記回転円板
の平面外縁部にマグネツト３が固着される一方、
磁気を受けると光を透過ないし遮断させる磁気光
学効果素子４を一端が光源５に、他端が処理回路
６ないし表示器７に接続する光フアイバ８の伝送
路に介設し、上記マグネツト３が上記磁気光学効
果素子４の前方を断続的に通過するように上記磁
気光学効果素子４を回転するマグネツト３が描く
円周上に向けて上記ケース２の内壁に対置した構
造である。 As shown in FIG. 1, the vehicle speed sensor of the present invention includes a rotating disk 1 that rotates according to the rotational speed of a wheel, which is housed in a case 2 that covers the rotating disk 1, and a magnet is attached to the outer edge of the planar surface of the rotating disk. While 3 is fixed,
A magneto-optic effect element 4 that transmits or blocks light when subjected to magnetism is interposed in a transmission path of an optical fiber 8 whose one end is connected to a light source 5 and the other end is connected to a processing circuit 6 or a display 7. This structure is opposed to the inner wall of the case 2 toward the circumference drawn by the magnet 3 that rotates the magneto-optic effect element 4 so as to pass intermittently in front of the magneto-optic effect element 4.
磁気光学効果素子４は磁気光学結晶が磁界にあ
るとき、それを通過する光の偏光面が回転するフ
アラデー効果を利用したものであり、MnBi（マ
ンガンビスマス）やEuO（酸化ユーロピウム）を
用いるとよい。また、第２図に示すように光源に
接続する光フアイバ８ａと磁気光学効果素子４の
間には偏光子９が、処理回路６に接続する光フア
イバ８ｂと磁気光学効果素子４の間には検光子１
０が介在されている。偏光子９は光フアイバを通
過した光の振動面を同一方向にそろえるものであ
り、検光子１０は磁気光学効果素子４内を透過し
た光を検出し光フアイバ８ａに送光する働きをす
るものである。 The magneto-optic effect element 4 utilizes the Faraday effect, in which the plane of polarization of light passing through the magneto-optic crystal rotates when it is in a magnetic field, and is preferably made of MnBi (manganese bismuth) or EuO (europium oxide). . Further, as shown in FIG. 2, a polarizer 9 is provided between the optical fiber 8a connected to the light source and the magneto-optic effect element 4, and a polarizer 9 is provided between the optical fiber 8b connected to the processing circuit 6 and the magneto-optic effect element 4. Analyzer 1
0 is interposed. The polarizer 9 serves to align the vibration planes of the light that has passed through the optical fiber in the same direction, and the analyzer 10 serves to detect the light that has passed through the magneto-optic effect element 4 and send it to the optical fiber 8a. It is.
次に、上記構造を有する本発明の車速センサの
作用について説明する。 Next, the operation of the vehicle speed sensor of the present invention having the above structure will be explained.
光フアイバ８の一端には光源５を、他端には光
量を電気量に変換する処理回路６を接続し、さら
に処理回路６には表示器７を接続して光フアイバ
８に送光しておくと、磁気光学効果素子４は回転
するマグネツト３が磁気光学効果素子４と対向す
るたびにマグネツト３の磁気を受けて上記光フア
イバ８ａに送光された光を透過させるため車輪の
回転数に応じた光のパルスが処理回路６に送られ
る。光のパルスは処理回路６によつて電気信号に
変換され、表示器７によつて車輪の速度が表示さ
れる。 A light source 5 is connected to one end of the optical fiber 8, and a processing circuit 6 for converting the amount of light into an amount of electricity is connected to the other end.A display 7 is further connected to the processing circuit 6 to send light to the optical fiber 8. Then, each time the rotating magnet 3 faces the magneto-optic effect element 4, the magneto-optic effect element 4 receives the magnetism of the magnet 3 and transmits the light transmitted to the optical fiber 8a, so that the rotation speed of the wheel changes. A corresponding pulse of light is sent to the processing circuit 6. The light pulses are converted into electrical signals by a processing circuit 6, and a display 7 displays the speed of the wheel.
上記実施例においては磁石が１個の場合につい
て説明したが測定の効率を高めるためにはその数
は限定されるものではない。また、磁気光学効果
素子はMnBi（マンガンビスマス）、EuO（酸化ユ
ーロピウム）等があるが同等の特性を有するもの
であればよい。さらに、本発明の車速センサは車
速の計測に限定されるものではなく、一般の回転
体にも回転板を取付ければ、回転数を計測するこ
とができる。 In the above embodiment, the case where there is one magnet has been described, but the number is not limited in order to improve measurement efficiency. Further, the magneto-optic effect element may be MnBi (manganese bismuth), EuO (europium oxide), etc., but any element having equivalent characteristics may be used. Further, the vehicle speed sensor of the present invention is not limited to measuring vehicle speed, but can also measure the rotational speed of a general rotating body by attaching a rotary plate thereto.
以上、実施例と共に具体的に説明したように本
発明によれば、光フアイバを用いて車速センサを
構成したので軽量化が図られ、電磁誘導ノイズの
影響もなく、安定した動作を行うとともに小型で
堅牢にすることができる。また、光フアイバの伝
送路には電気信号を用いないので電気エネルギー
消費が低減し、且つ電気的短絡による計器の損傷
もなく保守点検が楽になる。 As specifically explained above in conjunction with the embodiments, according to the present invention, the vehicle speed sensor is constructed using optical fibers, so it is lightweight, has no influence of electromagnetic induction noise, operates stably, and is compact. It can be made more robust. Furthermore, since no electrical signals are used in the optical fiber transmission path, electrical energy consumption is reduced, and maintenance and inspection are facilitated without damage to instruments due to electrical short circuits.
第１図は本発明にかかる車速センサの一実施例
の部分断面図、第２図はその拡大図である。
図面中、１は回転円板、３はマグネツト、４は
磁気光学効果素子、８，８ａ，８ｂは光フアイ
バ、９は偏光子、１０は検光子である。
FIG. 1 is a partial sectional view of an embodiment of a vehicle speed sensor according to the present invention, and FIG. 2 is an enlarged view thereof. In the drawing, 1 is a rotating disk, 3 is a magnet, 4 is a magneto-optic effect element, 8, 8a, 8b are optical fibers, 9 is a polarizer, and 10 is an analyzer.
Claims (1)
マグネツトを設ける一方、磁気を受けて光を透過
ないし遮断する磁気光学効果素子を光フアイバの
伝送路に介設し、車輪の回転速度に応じて上記マ
グネツトが上記磁気光学効果素子の前方を断続的
に通過するよう磁気光学効果素子を回転するマグ
ネツトが描く円周上に向けて対置させたことを特
徴とする車速センサ。1 A magnet is provided on a rotary plate that rotates according to the rotational speed of the wheel, and a magneto-optic effect element that transmits or blocks light by receiving magnetism is interposed in the optical fiber transmission path. A vehicle speed sensor characterized in that the magneto-optic effect element is disposed facing the circumference drawn by the rotating magnet so that the magnet intermittently passes in front of the magneto-optic effect element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10966880A JPS5734453A (en) | 1980-08-09 | 1980-08-09 | Wheel velocity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10966880A JPS5734453A (en) | 1980-08-09 | 1980-08-09 | Wheel velocity sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5734453A JPS5734453A (en) | 1982-02-24 |
| JPS6333646B2 true JPS6333646B2 (en) | 1988-07-06 |
Family
ID=14516132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10966880A Granted JPS5734453A (en) | 1980-08-09 | 1980-08-09 | Wheel velocity sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5734453A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04143661A (en) * | 1990-10-04 | 1992-05-18 | Daikin Ind Ltd | wind speed measuring device |
| US6109120A (en) * | 1999-04-16 | 2000-08-29 | 4B Elevator Components | Universal active shaft sensor mounting assembly |
| FR2899327B1 (en) * | 2006-04-04 | 2008-06-13 | Tolerie Ind Francaise S A S T | ROTATION CONTROLLER OR SUB-SPEED DETECTOR SUPPORT |
| CN105109934A (en) * | 2015-09-17 | 2015-12-02 | 山东钢铁股份有限公司 | Long distance monitoring device for impeller feeder |
-
1980
- 1980-08-09 JP JP10966880A patent/JPS5734453A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5734453A (en) | 1982-02-24 |
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