JPS59194293A - Tire air pressure sensor - Google Patents
Tire air pressure sensorInfo
- Publication number
- JPS59194293A JPS59194293A JP58068943A JP6894383A JPS59194293A JP S59194293 A JPS59194293 A JP S59194293A JP 58068943 A JP58068943 A JP 58068943A JP 6894383 A JP6894383 A JP 6894383A JP S59194293 A JPS59194293 A JP S59194293A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- air pressure
- tire
- transmitter
- antenna
- 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
- 230000010355 oscillation Effects 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は自動車などに用いることができるタイヤ空気圧
センサに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tire air pressure sensor that can be used in automobiles and the like.
従来例の構成とその問題点
近年、自動車の安全性に対する社会的要請が強くなって
いる。また高速道路の新設、延長によって高速走行する
機会が増加しているために、特にタイヤ空気圧を走行中
でも自動的に検出しようとする要望が根強い。Conventional configuration and its problems In recent years, social demands for automobile safety have become stronger. Furthermore, as opportunities for high-speed driving are increasing due to the construction and extension of expressways, there is a strong desire to automatically detect tire air pressure even while driving.
以下、図面を参照しながら従来のタイヤ空気圧センサに
ついて説明する。第１図は従来のタイヤ空気圧センサの
概略図であり、■はタイヤ、２は空気圧検出スイッチ、
３はコイル、４はタイヤホイール、５は検知磁気回路、
６は受信回路である。第２図は受信回路６のブロンク図
であり、７は発振回路、８は周波数検出回路、９は警報
回路である。Hereinafter, a conventional tire air pressure sensor will be described with reference to the drawings. Figure 1 is a schematic diagram of a conventional tire pressure sensor, where ■ is a tire, 2 is an air pressure detection switch,
3 is a coil, 4 is a tire wheel, 5 is a detection magnetic circuit,
6 is a receiving circuit. FIG. 2 is a block diagram of the receiving circuit 6, in which 7 is an oscillation circuit, 8 is a frequency detection circuit, and 9 is an alarm circuit.
以」−のように構成されたタイヤ空気圧センサについて
その動作を以下に説明する。The operation of the tire air pressure sensor configured as follows will be described below.
タイヤのバルブ部に取付けられた空気圧検出スイッチ２
は所定の圧力以下になれば通電する機能をもっている。Air pressure detection switch 2 attached to the tire valve part
has the function of energizing when the pressure falls below a predetermined level.
また第２図に示すように受信回路６内の発信回路７は検
知磁気回路のインダクタンスで決定される周波数で常時
発振している。今、何らかの原因で第１図のタイヤｌの
空気圧が所定の圧力より低下すれば、空気圧検出スイッ
チ２が通電し、第２図に示すようにコイル３は短絡され
る。また第１図に示すように、コイル３と検知磁気回路
５は電磁的結合が得られるよう検知磁気回路５はタイヤ
ホイールに近接して車体側に取付けられているために、
検知コイル３のインダクタンスが変化し、発振回路７の
発振周波数が変化する。この周波数変化を周波数検出回
路８で検出し、さらに警報回路９で運転者に警報を発す
る。Further, as shown in FIG. 2, the oscillating circuit 7 in the receiving circuit 6 constantly oscillates at a frequency determined by the inductance of the sensing magnetic circuit. Now, if the air pressure of the tire l shown in FIG. 1 falls below a predetermined pressure for some reason, the air pressure detection switch 2 is energized and the coil 3 is short-circuited as shown in FIG. Furthermore, as shown in FIG. 1, the coil 3 and the detection magnetic circuit 5 are installed on the vehicle body side in close proximity to the tire wheels so that the coil 3 and the detection magnetic circuit 5 are electromagnetically coupled.
The inductance of the detection coil 3 changes, and the oscillation frequency of the oscillation circuit 7 changes. A frequency detection circuit 8 detects this frequency change, and an alarm circuit 9 issues a warning to the driver.
しかしながら、上記のような構成においてはコイル３を
巻くために特別なタイヤホイール４を設ける必要があっ
た。またドロ、水等に汚染されやすいタイヤホイール４
に近接して検知磁気回路５を設置するため、検知磁気回
路５の信頼性に問題があった。さらに検知磁気回路５と
受信回路６とは銅線で接続する必要があり、乗用車の場
合には４個のタイヤ部分からそれぞれ受信回路６まで銅
線を引きまわさなければならず、取付は時においで難点
があるというような問題点を有していた。However, in the above configuration, it was necessary to provide a special tire wheel 4 for winding the coil 3. In addition, tire wheels 4 are easily contaminated with mud, water, etc.
Since the detection magnetic circuit 5 is installed in close proximity to the detection magnetic circuit 5, there is a problem in the reliability of the detection magnetic circuit 5. Furthermore, it is necessary to connect the detection magnetic circuit 5 and the receiving circuit 6 with a copper wire, and in the case of a passenger car, the copper wire must be routed from each of the four tire parts to the receiving circuit 6, and installation is sometimes difficult. It had some problems.
発明の目的
本発明の目的は機器本体の汚染に対する信頼性を向上す
ると共に、取付けが簡便なタイヤ空気圧センサを提供す
るものである。OBJECTS OF THE INVENTION An object of the present invention is to provide a tire air pressure sensor that improves reliability against contamination of the device body and is easy to install.
発明の構成
タイヤ空気圧が一定圧以下で通電するスイッチと、所定
のインダクタンスをもつコイル及び水晶振動子から成り
前記スイッチが通電すればそれらが閉回路を構成する発
信器をタイヤホイールに設けると共に、前記水晶振動子
を強制振動させる発振回路と、前記発信器が閉回路にな
れば前記発信器から放射される電波を受信する受信回路
と、前記発振回路と受信回路とを一定時間毎に交互にア
ンテナに切替えるアンテナ切替回路とから成る送受信機
を別に設け、前記アンテナ切替回路に設けたアンテナか
らの電波の交互の送受信によってタイヤ空気圧の低下に
よる前記スイッチの通電を検知するように構成した。こ
の構成によってスイッチが通電している場合には発信器
は閉回路を構成するので前記電波を発信器のコイルで受
信して水晶振動子を強制振動させ、アンテナ切替回路が
受信回路側に切替わっている時にコイルから発信器から
放射された電波を送受信機の受信回路で受信するように
し、タイヤ空気圧を検出するようにした。Structure of the Invention A transmitter is provided on the tire wheel, which is composed of a switch that is energized when the tire air pressure is below a certain pressure, a coil with a predetermined inductance, and a crystal oscillator, which form a closed circuit when the switch is energized. An oscillation circuit that forcibly oscillates a crystal resonator, a reception circuit that receives radio waves emitted from the oscillator when the oscillator becomes a closed circuit, and an antenna that alternately connects the oscillation circuit and the reception circuit at regular intervals. A transmitter/receiver consisting of an antenna switching circuit that switches to the antenna switching circuit is separately provided, and energization of the switch due to a decrease in tire air pressure is detected by alternately transmitting and receiving radio waves from the antenna provided in the antenna switching circuit. With this configuration, when the switch is energized, the transmitter forms a closed circuit, so the transmitter's coil receives the radio waves, forces the crystal oscillator to vibrate, and the antenna switching circuit switches to the receiving circuit side. The transmitter/receiver's receiving circuit receives the radio waves emitted from the transmitter from the coil when the vehicle is running, and detects the tire air pressure.
実施例の説明
以下本発明の一実施例について、図面を参照しながら説
明する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
第３図は本発明の一実施例におけるタイヤ空気圧センサ
の概略図を示すものである。第３図においては１はタイ
ヤ、２は空気圧検出用のスイッチ、４はタイヤホイール
、１０はタイヤホイールに取伺けられた発信器、１１は
別に設置した送受信機、１２はアンテナである。第４図
はタイヤ空気圧でンサのブロック図で、２は空気圧検出
用のスイッチ、１３はアンテナ１２の切替回路、１４は
発振回路、１５は受信回路、１６は警報回路、１７は発
信器１０内のコイル、１８は水晶振動子である。第５図
は波形、図で、ａはアンテナ１２より放射される電波波
形、ｂはコイル１７の両端の電圧波形である。FIG. 3 shows a schematic diagram of a tire air pressure sensor according to an embodiment of the present invention. In FIG. 3, 1 is a tire, 2 is a switch for detecting air pressure, 4 is a tire wheel, 10 is a transmitter attached to the tire wheel, 11 is a separately installed transmitter/receiver, and 12 is an antenna. Fig. 4 is a block diagram of a tire pressure sensor, in which 2 is a switch for detecting air pressure, 13 is a switching circuit for antenna 12, 14 is an oscillation circuit, 15 is a receiving circuit, 16 is an alarm circuit, and 17 is inside the transmitter 10. The coil 18 is a crystal oscillator. FIG. 5 shows waveforms, where a shows the radio waveform radiated from the antenna 12, and b shows the voltage waveform at both ends of the coil 17.
以上のように構成された本実施例のタイヤ空気圧センサ
について以下その動作を説明する。第３図の空気圧検出
スイッチ２はタイヤｌの空気圧が所定圧以下に低下すれ
ば通電する電気的スイッチで、いま通電状態にあるとす
る。第４図の送受信機１１には水晶振動子１８の固有振
動周波数と同じ周波数で第５図ａに出力波形を示すよう
に間欠発振する発振回路１４が構成されており、この出
力がアンテナ切替回路１３を経てアンテナ１２より放射
される。アンテナ切替回路１３は第５図ａのＴＩ期間は
アンテナ１２と発振回路１４とを接続し、Ｔ２期間はア
ンテナ１２と受信回路１５とを接続する機能をもつ。The operation of the tire air pressure sensor of this embodiment configured as described above will be explained below. The air pressure detection switch 2 in FIG. 3 is an electrical switch that is turned on when the air pressure of the tire l falls below a predetermined pressure, and is currently in the energized state. The transmitter/receiver 11 in FIG. 4 is constructed with an oscillation circuit 14 that intermittently oscillates at the same frequency as the natural oscillation frequency of the crystal oscillator 18 as shown in the output waveform in FIG. 13 and is radiated from the antenna 12. The antenna switching circuit 13 has the function of connecting the antenna 12 and the oscillation circuit 14 during the TI period in FIG. 5a, and connecting the antenna 12 and the receiving circuit 15 during the T2 period.
従ってアンテナ１２から放射される電波波形も第５図ａ
と同様になる。いま第４図のスイ（ツチ２が通電状態に
あるとすれば、コイル１７には第５図ａの電波によって
第５図すに示すような電圧が誘起される。すなわち、Ｔ
１期間ではコイル１７に誘起された電圧が水晶振動子１
８を強制振動させるため振幅が次第に大Ｓ〈なり、Ｔ２
期間ではコイル１７は電波を受信しないために水晶振動
子１８は独自に振動し、スイッチ２、コイル１７の直流
抵抗値及び水晶振動子１８のＱで決まるＴ２期間の間減
衰振動する。Therefore, the radio waveform radiated from the antenna 12 is also shown in Figure 5a.
It will be the same as If the switch 2 shown in FIG. 4 is in the energized state, a voltage as shown in FIG. 5 is induced in the coil 17 by the radio wave shown in FIG.
In one period, the voltage induced in the coil 17 is
8 is forced to vibrate, the amplitude gradually becomes larger S, and T2
Since the coil 17 does not receive radio waves during this period, the crystal oscillator 18 vibrates independently, and oscillates attenuated during the T2 period determined by the DC resistance value of the switch 2, the coil 17, and the Q of the crystal oscillator 18.
従ってＴ２期間の間はＴ１期間とは逆にコイル１７から
電波が放射されるため、この電波をアンテナ１２で受信
し、受信回路１５で検出し、警報回路１Ｂでブザーまた
はランプを用いて運転者に警報を発する。またタイヤ空
気圧が正常でスイッチ２が切状態のときは第５図すのＴ
２期間でのアンテナ１２による電波の受信がないために
受信回路１５は無信号状態を保ち、従って警報を発しな
い。Therefore, during the T2 period, radio waves are emitted from the coil 17, contrary to the T1 period, so these radio waves are received by the antenna 12, detected by the receiving circuit 15, and alerted to the driver using a buzzer or lamp by the alarm circuit 1B. issue a warning. Also, when the tire pressure is normal and switch 2 is off, T in Figure 5.
Since no radio waves are received by the antenna 12 during the two periods, the receiving circuit 15 maintains a no-signal state and therefore does not issue an alarm.
発明の効果
以」二の説明から明らかなように、本発明は水晶振動子
より放射される電波を検知する方式のため、空気圧検出
器と送受信機との結線が不要になり、設置が簡単にでき
る。またタイヤホイールも標準品にほとんど手を加える
必要がない。さらにはタイヤホイールに取付ける発信器
も小型にできるので合成樹脂等で防水構造にすることも
容易にでき、汚染による信頼性低下も防ぐことが可能に
なると共に設置スペースも小さくでき°る。As is clear from the explanation in ``Effects of the Invention'' (2), the present invention detects radio waves emitted from a crystal oscillator, so there is no need to connect the air pressure detector to the transmitter/receiver, making installation easy. can. In addition, the tires and wheels are standard products and require almost no modification. Furthermore, since the transmitter attached to the tire wheel can be made smaller, it can easily be made of synthetic resin or the like to have a waterproof structure, making it possible to prevent a decrease in reliability due to contamination and reducing the installation space.
すなわち本発明によれば信頼性、取付けの簡便さ、小型
化の点で実用上の大きな特徴を有する。That is, the present invention has significant practical features in terms of reliability, ease of installation, and miniaturization.
第１図は従来のタイヤ空気圧センサの概略図、第２図は
同受信回路のブロック図、第３図は本発明の−・実施例
を示すタイヤ空気圧センサの概略図、第４図は同ブロッ
ク図、第５図ａはアンテナより放射される電波の波形、
同すはコイル１７の端子電圧波形を示す。
１・・・・・・タイヤ ２・・・・・・スイッチ４・
・・・・・タイヤホイール １ｏ・・・・・・発信器
１１・・・・・・送受信機 １２・・・・・・ア゛ン
テナ１３・・・・・・アンテナ切替回路 １４・・・
・・・発振回路１５・・・・・・受信回路 １６・・
・・・・警報回路１７・・・・・・コイル １８・・
・・・・水晶振動子第１図
第３図Fig. 1 is a schematic diagram of a conventional tire air pressure sensor, Fig. 2 is a block diagram of the same receiving circuit, Fig. 3 is a schematic diagram of a tire air pressure sensor showing an embodiment of the present invention, and Fig. 4 is the same block diagram. Figure 5a shows the waveform of the radio waves radiated from the antenna.
The same figure shows the terminal voltage waveform of the coil 17. 1... Tire 2... Switch 4.
... Tire wheel 1o ... Transmitter 11 ... Transmitter/receiver 12 ... Antenna 13 ... Antenna switching circuit 14 ...
...Oscillation circuit 15...Reception circuit 16...
...Alarm circuit 17...Coil 18...
...Crystal unit Figure 1 Figure 3
Claims (1)
のインダクタンスをもつコイル及び水晶振動子から成り
前記スイフチが通電すればそれらが閉回路を構成する発
信器をタイヤホイールに設けると共に、前記水晶振動子
を強制振動させる発振回路と、前記発信器が閉回路にな
れば前記発信器から放射される電波を受信する受信回路
と、前記発振回路と受信回路とを一定時間毎に交互にア
ンテナに切替えるアンテナ切替回路とから成る送受信機
を別に設け、前記アンテナ切替回路に設けたアンテナか
らの゛ｒ程波の交互の送受信によってタイヤ空気圧の低
下による前記スイッチの通電を検知するように構成した
タイヤ空気圧センサ。A transmitter is provided on the tire wheel, which consists of a swifter that is energized when the tire air pressure is below a certain pressure, a coil with a predetermined inductance, and a crystal oscillator, which form a closed circuit when the swifter is energized. an oscillation circuit that forces the child to vibrate; a reception circuit that receives radio waves emitted from the transmitter when the transmitter becomes a closed circuit; and an antenna that alternately switches between the oscillation circuit and the reception circuit at regular intervals. A tire air pressure sensor is provided with a separate transmitter/receiver comprising an antenna switching circuit, and is configured to detect energization of the switch due to a decrease in tire air pressure by alternately transmitting and receiving a frequency wave from an antenna provided in the antenna switching circuit. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58068943A JPS59194293A (en) | 1983-04-18 | 1983-04-18 | Tire air pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58068943A JPS59194293A (en) | 1983-04-18 | 1983-04-18 | Tire air pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59194293A true JPS59194293A (en) | 1984-11-05 |
Family
ID=13388252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58068943A Pending JPS59194293A (en) | 1983-04-18 | 1983-04-18 | Tire air pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59194293A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009118531A (en) * | 2001-11-09 | 2009-05-28 | Messier Bugatti | Passive device for increasing transmission effectiveness of radio frequency systems |
| WO2018146674A1 (en) * | 2017-02-08 | 2018-08-16 | Tyco Fire & Security Gmbh | Door\window opening detector |
-
1983
- 1983-04-18 JP JP58068943A patent/JPS59194293A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009118531A (en) * | 2001-11-09 | 2009-05-28 | Messier Bugatti | Passive device for increasing transmission effectiveness of radio frequency systems |
| WO2018146674A1 (en) * | 2017-02-08 | 2018-08-16 | Tyco Fire & Security Gmbh | Door\window opening detector |
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