JPH11108652A - Detecting device of conditions of traveling road surface - Google Patents
Detecting device of conditions of traveling road surfaceInfo
- Publication number
- JPH11108652A JPH11108652A JP9265296A JP26529697A JPH11108652A JP H11108652 A JPH11108652 A JP H11108652A JP 9265296 A JP9265296 A JP 9265296A JP 26529697 A JP26529697 A JP 26529697A JP H11108652 A JPH11108652 A JP H11108652A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- road surface
- discharge
- wet
- electric charge
- 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
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】 本発明は走行路面状態の検
出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a traveling road surface condition.
【０００２】[0002]
【従来の技術】 従来の走行路面状態の検出装置として
は、例えば、特願平７−２０４４７２号公報に記載され
ているようになものが知られている。すなわち、この従
来装置は、図６に示すように、車両のタイヤと路面との
接触音をマイクで検出すると共に、車両の速度を速度検
出部で検出し、信号処理部で、前記マイクからの接触音
信号ならびに前記速度検出部からの速度信号を予め定め
られた周期でサンプリングし、その度に判定部に与える
ものである。2. Description of the Related Art As a conventional traveling road surface state detecting device, for example, a device as described in Japanese Patent Application No. 7-204472 is known. That is, as shown in FIG. 6, this conventional device detects a contact sound between a tire of a vehicle and a road surface with a microphone, detects a speed of the vehicle with a speed detection unit, and a signal processing unit, and outputs a signal from the microphone. The contact sound signal and the speed signal from the speed detection unit are sampled at a predetermined cycle, and are provided to the determination unit each time.
【０００３】[0003]
【発明が解決しようとする課題】 しかしながら、この
ような従来の走行路面状態の検出装置においては、路面
とタイヤの接触状態を音などの間接的な状態量を用いて
推定するという構成であるため、路面状況の推定精度が
不正確であるという問題点があった。この発明は、この
ような従来の問題点に着目してなされたもので、絶縁体
を有する材料で構成されたタイヤ表面に、電荷を連続生
成させ、ウエット路面ではその電荷が路面に吸収される
ことでタイヤ表面からの静電放電による電波発信が低減
することを検知して判断することにより、上記問題点を
解決することを目的としている。However, such a conventional traveling road surface state detection device is configured to estimate a contact state between a road surface and a tire using an indirect state amount such as sound. However, there is a problem that the estimation accuracy of the road surface condition is inaccurate. The present invention has been made in view of such a conventional problem, and continuously generates an electric charge on a tire surface made of a material having an insulator, and the electric charge is absorbed by a road surface on a wet road surface. It is an object of the present invention to solve the above-mentioned problem by detecting and determining that radio wave transmission due to electrostatic discharge from the tire surface is reduced.
【０００４】[0004]
【課題を解決するための手段】 このため、請求項１記
載の走行路面状態の検出装置では、車両に装着されるタ
イヤにおいて、タイヤもしくはホイールに設置された連
続的に電荷を生成する機構と、車体側に設けられた電波
受信装置とからなる構成とした。請求項２記載の発明で
は、請求項１記載の走行路面状態の検出装置において、
弾性部分が絶縁体としての物性を持つタイヤを有する構
成とした。Therefore, in the running road surface state detecting device according to the first aspect, in a tire mounted on a vehicle, a mechanism installed on the tire or the wheel for continuously generating electric charge, And a radio wave receiving device provided on the vehicle body. According to the second aspect of the present invention, in the traveling road surface state detecting device according to the first aspect,
The elastic portion had a tire having physical properties as an insulator.
【０００５】[0005]
【発明の実施の形態】 以下、この発明の実施の形態を
図面に基づいて説明する。図１は、この発明の実施の形
態を示す図である。まず構成を説明すると、車両に装着
されたタイヤ１のホイール２に、電荷生成器３が装着さ
れており、車体側には、電波受信用のアンテナ４がホイ
ールハウス内に設置されている。アンテナ４は、検出回
路５に接続されており、検出回路５からは表示回路６に
接続されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. First, the structure will be described. A charge generator 3 is mounted on a wheel 2 of a tire 1 mounted on a vehicle, and an antenna 4 for radio wave reception is installed in a wheel house on the vehicle body side. The antenna 4 is connected to a detection circuit 5, and the detection circuit 5 is connected to a display circuit 6.
【０００６】図２はホイール・タイヤ部の構成を示す図
である。ホイール２には、通常取付けられているエアバ
ルブ７の他に、電荷生成器３がホイールリム部のエッジ
にクランプして固定され、電荷生成器３で発生した静電
電荷がタイヤ１表面にチャージされるようになってい
る。FIG. 2 is a diagram showing the configuration of the wheel / tire section. In addition to the air valve 7 normally mounted on the wheel 2, a charge generator 3 is clamped and fixed to the edge of the wheel rim, and the electrostatic charge generated by the charge generator 3 is charged on the surface of the tire 1. It has become so.
【０００７】図３は電荷生成器３の構成を示す図であ
る。容器８の内部に、部材にかかるストレスにより起電
するピエゾ素子１０と、ホイール２の回転や振動によっ
て加振されてピエゾ素子１０を駆動する慣性マス９があ
る。FIG. 3 is a diagram showing the configuration of the charge generator 3. As shown in FIG. Inside the container 8, there are a piezo element 10 that generates electricity due to stress applied to the members, and an inertial mass 9 that is excited by the rotation or vibration of the wheel 2 to drive the piezo element 10.
【０００８】次に作用を説明する。図４にタイヤゴム材
の電気伝導度を示す。タイヤには、その主要素材である
ゴムを補強するためゴムに添加材を混入させる。一般的
なタイヤでは、その添加材の主成分はカーボンであり、
カーボン自身が伝導体のため、タイヤの電気抵抗は低
い。車両燃費向上のため、タイヤの転動抵抗低減と他性
能（主としてウエット路面での設置性能確保）のバラン
スをとれる素材としてシリカが注目され実用化しつつあ
る。ただし、シリカそのものは硅素であり、絶縁体とし
ての性格をもつため、タイヤゴムへの添加材として使用
した場合、タイヤの電気抵抗が大きくなってしまう。そ
のため、タイヤ表面には摩擦等による静電電荷がたまり
やすく、タイヤの振動や路面との接触によりタイヤ自身
の表面電気容量が変化する時に電荷放電し、電波を発生
させる。Next, the operation will be described. FIG. 4 shows the electrical conductivity of the tire rubber material. In a tire, an additive is mixed with the rubber in order to reinforce the rubber which is the main material. In a general tire, the main component of the additive is carbon,
Since carbon itself is a conductor, the electric resistance of the tire is low. Silica has been attracting attention and is being put to practical use as a material capable of balancing the reduction of rolling resistance of tires and other performances (mainly installation performance on wet road surfaces) in order to improve vehicle fuel efficiency. However, since silica itself is silicon and has the property of an insulator, when used as an additive to tire rubber, the electrical resistance of the tire increases. For this reason, electrostatic charges due to friction or the like easily accumulate on the tire surface, and when the surface electric capacity of the tire itself changes due to the vibration of the tire or the contact with the road surface, the tire discharges and generates radio waves.
【０００９】図５に路面の状態によるタイヤ表面電荷の
違いを示す。電荷生成器３によりタイヤ１の表面にチャ
ージされた電荷は、路面状態がドライであるときは、
（ｉ）に示すように、タイヤ１の表面上に留まり、走行
時の振動等により放電を繰り返す。この放電に伴う電波
を信号としてホイールハウス内のアンテナ４で検出する
ことで、走行中の路面状態がドライであることを判断す
る。路面がウエット状態であるときは、（ii）に示すよ
うに、タイヤ１の表面に供給される静電電荷は、タイヤ
１と路面間にある液層により吸収されるため、電荷はタ
イヤ１の表面にチャージされない。このため放電も発生
せず、走行していてもアンテナ４で放電による電波は検
出できなくなる。これにより、タイヤ１がウエット路面
を走行中もしくは、タイヤ１自身がウエット状態である
ことを判断する。FIG. 5 shows the difference in tire surface charge depending on the road surface condition. The charge charged on the surface of the tire 1 by the charge generator 3 is, when the road surface condition is dry,
As shown in (i), the tire stays on the surface of the tire 1 and repeatedly discharges due to vibrations during running. By detecting a radio wave associated with this discharge as a signal with the antenna 4 in the wheel house, it is determined that the road surface condition during traveling is dry. When the road surface is in a wet state, as shown in (ii), the electrostatic charge supplied to the surface of the tire 1 is absorbed by a liquid layer between the tire 1 and the road surface. Not charged to the surface. For this reason, no discharge occurs, and the radio wave due to the discharge cannot be detected by the antenna 4 even while traveling. Thus, it is determined that the tire 1 is traveling on a wet road surface or that the tire 1 itself is in a wet state.
【００１０】[0010]
【発明の効果】 以上説明してきたように、この発明に
よれば、その構成を絶縁性を有する材料で構成されたタ
イヤ表面に、電荷を連続生成させ、ウエット路面ではそ
の電荷が路面に吸収されることでタイヤ表面からの静電
放電による電波発信が低減することを利用してタイヤの
ドライ、ウエット状態を判別するようにしたため、真に
タイヤがウエット状態にあるということを検出できると
いう効果が得られる。As described above, according to the present invention, the electric charge is continuously generated on the tire surface composed of an insulating material, and the electric charge is absorbed by the road surface on a wet road surface. By making use of the fact that the transmission of radio waves due to electrostatic discharge from the tire surface is reduced, the dry / wet state of the tire is determined, so that the effect that the tire is truly in the wet state can be detected. can get.
【図１】 本実施の形態のシステム構成の概要図であ
る。FIG. 1 is a schematic diagram of a system configuration according to an embodiment.
【図２】 ホイール・タイヤ部の構成図である。FIG. 2 is a configuration diagram of a wheel / tire unit.
【図３】 電荷生成器の構成図である。FIG. 3 is a configuration diagram of a charge generator.
【図４】 タイヤゴム材の電気伝導度を示す図である。FIG. 4 is a view showing the electric conductivity of a tire rubber material.
【図５】 タイヤと路面の電荷状態を示す図で、（ｉ）
はドライ路面の場合を示し、（ii）はウエット路面の場
合を示す。FIG. 5 is a diagram showing a state of charge on a tire and a road surface, and (i)
Indicates a case of a dry road surface, and (ii) indicates a case of a wet road surface.
【図６】 従来例である。FIG. 6 is a conventional example.
１ タイヤ ２ ホイール ３ 電荷生成器 ４ アンテナ ５ 検出回路 ６ 表示回路 ７ エアバルブ ８ 容器 ９ 慣性マス １０ ピエゾ素子 Reference Signs List 1 tire 2 wheel 3 charge generator 4 antenna 5 detection circuit 6 display circuit 7 air valve 8 container 9 inertial mass 10 piezo element
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ６０Ｃ 23/02 Ｂ６０Ｃ 23/02 Ｂ Ｌ 23/04 23/04 Ｎ Ｇ０１Ｍ 17/007 Ｇ０１Ｎ 27/60 Ａ Ｇ０１Ｎ 27/60 Ｇ０１Ｗ 1/00 Ｊ // Ｇ０１Ｗ 1/00 Ｇ０１Ｍ 17/00 Ｚ ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI B60C 23/02 B60C 23/02 B L23 / 04 23/04 N G01M 17/007 G01N 27/60 A G01N 27/60 G01W 1 / 00 J // G01W 1/00 G01M 17/00 Z
Claims (2)
ヤもしくはホイールに設置された連続的に電荷を生成す
る機構と、車体側に設けられた電波受信装置とからなる
ことを特徴とする走行路面状態の検出装置。1. A running road surface condition for a tire mounted on a vehicle, comprising: a mechanism for continuously generating electric charges installed on the tire or the wheel; and a radio wave receiving device provided on the vehicle body side. Detection device.
において、弾性部分が絶縁体としての物性を持つタイヤ
を有することを特徴とする走行路面状態の検出装置。2. The traveling road surface state detecting device according to claim 1, wherein the elastic portion includes a tire having physical properties as an insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9265296A JPH11108652A (en) | 1997-09-30 | 1997-09-30 | Detecting device of conditions of traveling road surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9265296A JPH11108652A (en) | 1997-09-30 | 1997-09-30 | Detecting device of conditions of traveling road surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11108652A true JPH11108652A (en) | 1999-04-23 |
Family
ID=17415240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9265296A Pending JPH11108652A (en) | 1997-09-30 | 1997-09-30 | Detecting device of conditions of traveling road surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11108652A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1484594A2 (en) * | 2003-06-02 | 2004-12-08 | The Yokohama Rubber Co., Ltd. | Tire earth effect checking method and apparatus |
| WO2013099984A1 (en) * | 2011-12-26 | 2013-07-04 | 国立大学法人 東京大学 | Measurement method and measurement device |
| JP2013151272A (en) * | 2011-12-26 | 2013-08-08 | Univ Of Tokyo | Measurement device, measurement method, road surface state estimation method, road surface state estimation device, and detection device |
| JP2014234038A (en) * | 2013-05-31 | 2014-12-15 | 国立大学法人 東京大学 | Deformation state sensing method of in-tire sensor, tire touch-down state estimation method, and tire touch-down state estimation apparatus |
-
1997
- 1997-09-30 JP JP9265296A patent/JPH11108652A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1484594A2 (en) * | 2003-06-02 | 2004-12-08 | The Yokohama Rubber Co., Ltd. | Tire earth effect checking method and apparatus |
| EP1484594A3 (en) * | 2003-06-02 | 2006-03-22 | The Yokohama Rubber Co., Ltd. | Tire earth effect checking method and apparatus |
| WO2013099984A1 (en) * | 2011-12-26 | 2013-07-04 | 国立大学法人 東京大学 | Measurement method and measurement device |
| JP2013151272A (en) * | 2011-12-26 | 2013-08-08 | Univ Of Tokyo | Measurement device, measurement method, road surface state estimation method, road surface state estimation device, and detection device |
| US9772361B2 (en) | 2011-12-26 | 2017-09-26 | The University Of Tokyo | Measuring method and measuring apparatus to detect charge potential between tire and road surface |
| JP2014234038A (en) * | 2013-05-31 | 2014-12-15 | 国立大学法人 東京大学 | Deformation state sensing method of in-tire sensor, tire touch-down state estimation method, and tire touch-down state estimation apparatus |
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