JPH0246111B2 - - Google Patents
Info
- Publication number
- JPH0246111B2 JPH0246111B2 JP58241626A JP24162683A JPH0246111B2 JP H0246111 B2 JPH0246111 B2 JP H0246111B2 JP 58241626 A JP58241626 A JP 58241626A JP 24162683 A JP24162683 A JP 24162683A JP H0246111 B2 JPH0246111 B2 JP H0246111B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic fluid
- acceleration
- magnetic
- detecting
- magnetism generating
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/11—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by inductive pick-up
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid-Damping Devices (AREA)
- Measuring Fluid Pressure (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、自動車等移動体の加速度を検出す
るセンサに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sensor for detecting acceleration of a moving body such as an automobile.
（従来の技術）
従来の加速度センサは、例えば加速度によつて
生じる慣性力を受け、この慣性力の大きさに応じ
て変位する磁性体と、該磁性体に対向して設けら
れたコイルを有し、前記磁性体の変位によつて前
記コイルに生ずる誘導起電力を検出し、その大き
さから加速度を測定するものが、例えば実開昭58
−27772号公報等により公知である。(Prior Art) A conventional acceleration sensor includes a magnetic body that receives an inertial force caused by acceleration and is displaced according to the magnitude of the inertial force, and a coil that is disposed opposite to the magnetic body. However, there is a device that detects the induced electromotive force generated in the coil due to the displacement of the magnetic body and measures the acceleration from the magnitude, for example, as developed in 1983.
It is publicly known from Publication No.-27772 and the like.
（発明が解決しようとする課題）
しかし、上記加速度センサにおいては、前述の
磁性体を支持するための機構部により、加速度セ
ンサの構造が複雑になるので、その機構部が損傷
して加速度センサの信頼性を阻害するという欠点
があつた。(Problem to be Solved by the Invention) However, in the above-mentioned acceleration sensor, the structure of the acceleration sensor becomes complicated due to the mechanical part for supporting the magnetic body, so the mechanical part may be damaged and the acceleration sensor It had the drawback of hindering reliability.
そこで、この発明は、徐述したように磁性体を
支持する機構部が複雑であることに起因する従来
の欠点を解消し、信頼性が高い加速度センサを提
供することを課題とする。 SUMMARY OF THE INVENTION Therefore, as described above, it is an object of the present invention to provide a highly reliable acceleration sensor that eliminates the conventional drawbacks caused by the complexity of the mechanism that supports the magnetic body.
（課題を解決するための手段）
しかして、第１の発明の要旨とするところは、
磁性流体を加速方向へ移動自在に封入したケース
と、前記磁性流体に一定の磁気を与え定位置に保
持する定磁気発生手段と、前記磁性流体の位置を
検出する検出手段とを具備することにある。(Means for solving the problem) However, the gist of the first invention is as follows:
The magnetic fluid is provided with a case enclosing a magnetic fluid so as to be movable in an acceleration direction, a constant magnetism generating means for imparting a constant magnetism to the magnetic fluid and holding it in a fixed position, and a detection means for detecting the position of the magnetic fluid. be.
また、第２の発明の要旨とするところは、磁性
流体を加速方向へ移動自在に封入したケースと、
前記磁性流体に可変の磁気を与え定位置を保持す
る可変磁気発生手段と、前記磁性流体の位置を検
出する検出手段と、この検出手段の出力に基づい
て前記磁性流体の位置を元に戻すための電流を前
記可変磁気発生手段に送る制御手段とを具備する
ことにある。 Further, the gist of the second invention is to include a case in which a magnetic fluid is enclosed so as to be movable in the acceleration direction;
variable magnetism generating means for imparting variable magnetism to the magnetic fluid to hold it in a fixed position; detecting means for detecting the position of the magnetic fluid; and returning the position of the magnetic fluid to its original position based on the output of the detecting means. and control means for sending the current to the variable magnetism generating means.
（作用）
従つて、第１の実施例においては、磁性流体の
位置変化によつて生ずる電圧変化から加速度を側
定し、第２の実施例においては、磁性流体の位置
変化を防げる磁界を発生するに要する電流値から
加速度を測定するので、上記磁性流体をケースに
封入して構成を簡単にすることができ、そのた
め、上記課題を達成することができるものであ
る。(Function) Therefore, in the first embodiment, the acceleration is determined from the voltage change caused by the change in the position of the magnetic fluid, and in the second embodiment, a magnetic field that can prevent the change in the position of the magnetic fluid is generated. Since the acceleration is measured from the current value required for this purpose, the magnetic fluid can be enclosed in a case to simplify the configuration, and therefore the above object can be achieved.
（実施例）
以下、この発明の実施例を図面により説明す
る。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図にはこの発明に係る実施例が示され、加
速度センサ１は、非磁性体から成るハウジング２
を有し、このハウジング２の一側面にはコネクタ
３が取り付けられ、磁性流体４は、同一比重を有
する他の流体５と共に、非磁性体から成るケース
６に封入されている。この磁性流体４は、例えば
直径が約100A程度の強磁性体粒子Fe3O4を水銀
に高濃度に分散したコロイド状の液体で、磁場を
作用させても磁性流体粒子の沈降や凝集が起ら
ず、見かけ上液体自身が磁性を持つているように
振る舞うものである。 FIG. 1 shows an embodiment of the present invention, in which an acceleration sensor 1 includes a housing 2 made of a non-magnetic material.
A connector 3 is attached to one side of the housing 2, and a magnetic fluid 4 is enclosed in a case 6 made of a non-magnetic material along with another fluid 5 having the same specific gravity. The magnetic fluid 4 is a colloidal liquid in which ferromagnetic particles Fe 3 O 4 with a diameter of approximately 100 A are dispersed in mercury at a high concentration, and even when a magnetic field is applied, the magnetic fluid particles do not settle or aggregate. Instead, the liquid appears to behave as if it were magnetic.
定磁気発生手段を構成する永久磁石７は、前記
ケース６の中央部の周囲を覆うように配置されて
いる。この永久磁石７の磁気作用により、前記ケ
ース６内において、磁性流体４が前記永久磁石７
による磁場を中心に凝集し、他の流体５とは分離
した状態となる。尚、この実施例においては、定
磁気発生手段を永久磁石７によつて構成したが、
一定磁気を発生する電磁石で構成してもよい。 A permanent magnet 7 constituting a constant magnetism generating means is arranged so as to cover the periphery of the central portion of the case 6. Due to the magnetic action of the permanent magnet 7, the magnetic fluid 4 is attracted to the permanent magnet 7 in the case 6.
It aggregates around the magnetic field caused by the fluid 5, and becomes separated from other fluids 5. Incidentally, in this embodiment, the constant magnetism generating means was constituted by the permanent magnet 7, but
It may also be composed of an electromagnet that generates constant magnetism.
検出手段は、この実施例にあつては、前記永久
磁石７の両側でケース６の周囲に設けられた差動
トランス８，９から構成されている。該差動トラ
ンス８，９は、例えば一次巻線と二次巻線、とが
複合的に巻かれており、前記磁性流体４の位置
（形状変化を含む。以下同じ。）を二次巻線の端子
電圧をもつて検出するようになつている。 In this embodiment, the detection means is comprised of differential transformers 8 and 9 provided around the case 6 on both sides of the permanent magnet 7. The differential transformers 8 and 9 are, for example, compositely wound with a primary winding and a secondary winding, and the position of the magnetic fluid 4 (including change in shape; the same applies hereinafter) is controlled by the secondary winding. It is designed to be detected with a terminal voltage of .
電気制御装置１０は、前記差動トランス８，９
の一次巻線に一定の電圧を印加すると共に、差動
トランス８，９の二次巻線の端子電圧が入力さ
れ、例えばデジタル信号に変換して表示器１１に
出力し、前記磁性流体４の位置をもつて加速度を
表示するようになつている。 The electric control device 10 includes the differential transformers 8 and 9.
A constant voltage is applied to the primary winding, and the terminal voltage of the secondary windings of the differential transformers 8 and 9 is inputted, which is converted into, for example, a digital signal and output to the display 11, and the magnetic fluid 4 is It is designed to display acceleration based on position.
上記構成において、加速以前においては、磁性
流体４は、永久磁石７によつて形成される磁界を
中心に凝集するので、差動トランス８，９の２次
側出力端子には一定の電圧が誘起され、表示器１
１には加速度が零であることを示す。 In the above configuration, before acceleration, the magnetic fluid 4 condenses around the magnetic field formed by the permanent magnet 7, so a constant voltage is induced at the secondary output terminals of the differential transformers 8 and 9. and display 1
1 indicates that the acceleration is zero.
次に、第１図二点鎖線矢印方向（右方向）に加
速されると、磁性流体４が加速方向に慣性力を受
けるので、磁性流体４と他の流体５との境界面
は、加速度の大きさに応じ、第１図Ａのように加
速方向へ延びる。 Next, when the magnetic fluid 4 is accelerated in the direction of the two-dot chain arrow (rightward) in FIG. Depending on the size, it extends in the acceleration direction as shown in FIG. 1A.
この磁性流体４の変位によつて、左側の差動ト
ランス８の一次巻線と二次巻線との磁気的結合度
は増加し、前記２次側電圧も増加する。この電圧
変化は、電気制御装置１０によつて検出され、表
示器１１において対応する加速度の値に変換さ
れ、表示される。加速方向が逆方向（実線矢印で
示す）の場合には、右側の差動トランス９におい
て前述と同様に電圧変化が生じ、加速度が測定で
きる。尚、加速度方向が一方向の場合には、差動
トランス８，９どちらか一方を設けるようにすれ
ば足りる。 Due to this displacement of the magnetic fluid 4, the degree of magnetic coupling between the primary winding and the secondary winding of the left differential transformer 8 increases, and the secondary side voltage also increases. This voltage change is detected by the electric control device 10, converted into a corresponding acceleration value, and displayed on the display 11. When the acceleration direction is the opposite direction (indicated by the solid arrow), a voltage change occurs in the right differential transformer 9 in the same manner as described above, and the acceleration can be measured. Note that if the acceleration direction is one direction, it is sufficient to provide either one of the differential transformers 8 and 9.
次に第２の発明に係る実施例を説明する。 Next, an embodiment according to the second invention will be described.
この実施例は、第１図において、差動トランス
８，９の一方を磁性流体４に可変の磁気を与える
可変磁気発生手段を構成する磁気発生コイルとす
る点が前記第１の発明に係る実施例と主に異な
り、他の構成はほとんど前記第１の発明に係る実
施例と同じである。 This embodiment is an embodiment according to the first invention in that, in FIG. 1, one of the differential transformers 8 and 9 is used as a magnetism generating coil constituting variable magnetism generating means that applies variable magnetism to the magnetic fluid 4. This embodiment is mainly different from the example, and the other configurations are almost the same as the embodiment according to the first invention.
即ち、差動トランス８又は９から出力された磁
性流体４の位置信号は、制御手段を構成する電気
制御装置１０に入力され、該電気制御装置１０に
おいて、前記機構部４を元の位置に戻すための電
流値が演算され、この電流を磁気発生コイル９又
は８に送つて磁性流体４の位置を元に戻すと共
に、この電流値を表示器１１に表示するようにな
つているものである。 That is, the position signal of the magnetic fluid 4 output from the differential transformer 8 or 9 is input to the electric control device 10 constituting the control means, and in the electric control device 10, the mechanism section 4 is returned to its original position. A current value is calculated, and this current is sent to the magnetism generating coil 9 or 8 to return the magnetic fluid 4 to its original position, and this current value is displayed on the display 11.
尚、かかる実施例における永久磁石７は、磁気
発生コイル８又は９で代用して省略することがで
きる。 Incidentally, the permanent magnet 7 in this embodiment can be omitted by replacing it with the magnetism generating coil 8 or 9.
（発明の効果）
以上述べたように、この発明によれば、磁性流
体を加速度に応じて移動自在にケースに封入し、
この磁性流体の位置変化を検出するようにして、
従来のような検出部分の機械的な支持部を不要な
ものとしたので、故障が少なくなつて信頼性を向
上させることができる。また、加速度センサの構
成が簡単なものとなるので、安価で小型、軽量と
することができる等の効果を奏するものである。(Effects of the Invention) As described above, according to the present invention, a magnetic fluid is enclosed in a case so as to be movable according to acceleration,
By detecting changes in the position of this magnetic fluid,
Since the conventional mechanical support for the detection part is not required, failures can be reduced and reliability can be improved. Furthermore, since the acceleration sensor has a simple configuration, it can be made inexpensive, small, and lightweight.
第１図はこの発明に係る実施例を示す構成図で
ある。
４……磁性流体、７……永久磁石、８……差動
トランス又は磁気発生コイル、９……差動トラン
ス又は磁気発生コイル、１０……電気制御装置。
FIG. 1 is a block diagram showing an embodiment according to the present invention. 4...Magnetic fluid, 7...Permanent magnet, 8...Differential transformer or magnetic generation coil, 9...Differential transformer or magnetic generation coil, 10...Electric control device.
Claims (1)
ースと、前記磁性流体に一定の磁気を与え定位置
に保持する定磁気発生手段と、前記磁性流体の位
置を検出する検出手段とを具備することを特徴と
する加速度センサ。 ２ 磁性流体を加速方向へ移動自在に封入したケ
ースと、前記磁性流体に可変の磁気を与え定位置
に保持する可変磁気発生手段と、前記磁性流体の
位置を検出する検出手段と、この検出手段の出力
に基づいて前記磁性流体の位置を元に戻すための
電流を前記可変磁気発生手段に送る制御手段とを
具備することを特徴とする加速度センサ。[Scope of Claims] 1. A case enclosing a magnetic fluid so as to be movable in an acceleration direction, constant magnetism generating means for applying a constant magnetism to the magnetic fluid and holding it in a fixed position, and a detection device for detecting the position of the magnetic fluid. An acceleration sensor comprising: means. 2. A case enclosing a magnetic fluid so as to be movable in an acceleration direction, a variable magnetism generating means for applying variable magnetism to the magnetic fluid and holding it in a fixed position, a detecting means for detecting the position of the magnetic fluid, and this detecting means. and control means for sending a current to the variable magnetism generating means to restore the position of the magnetic fluid to the original position based on the output of the acceleration sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24162683A JPS60133370A (en) | 1983-12-21 | 1983-12-21 | Acceleration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24162683A JPS60133370A (en) | 1983-12-21 | 1983-12-21 | Acceleration sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60133370A JPS60133370A (en) | 1985-07-16 |
| JPH0246111B2 true JPH0246111B2 (en) | 1990-10-12 |
Family
ID=17077115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24162683A Granted JPS60133370A (en) | 1983-12-21 | 1983-12-21 | Acceleration sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60133370A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63109654U (en) * | 1987-01-07 | 1988-07-14 | ||
| JPS63129866U (en) * | 1987-02-18 | 1988-08-24 | ||
| JPH0697236B2 (en) * | 1987-05-30 | 1994-11-30 | 株式会社日本自動車部品総合研究所 | Acceleration sensor |
| JPH0650775Y2 (en) * | 1988-03-04 | 1994-12-21 | エヌオーケー株式会社 | Acceleration sensor |
| US4984463A (en) * | 1988-09-28 | 1991-01-15 | Nippon Soken, Inc. | Two-dimensional acceleration sensor |
| FR2671870A1 (en) * | 1991-01-18 | 1992-07-24 | Centre Nat Rech Scient | Ferrofluid force sensors |
| JPH10160748A (en) * | 1996-12-03 | 1998-06-19 | Oki Electric Ind Co Ltd | Impact sensor |
| DE10027641C2 (en) * | 2000-06-02 | 2003-04-17 | Daimler Chrysler Ag | Rollover sensor |
| JP2008209234A (en) * | 2007-02-26 | 2008-09-11 | Nohmi Bosai Ltd | Acceleration sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5210947Y2 (en) * | 1972-06-05 | 1977-03-09 | ||
| JPS4988572A (en) * | 1972-12-23 | 1974-08-23 | ||
| GB1492142A (en) * | 1975-03-26 | 1977-11-16 | Russell A | Linear accelerometers |
-
1983
- 1983-12-21 JP JP24162683A patent/JPS60133370A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60133370A (en) | 1985-07-16 |
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