JPH01147706U

JPH01147706U -

Info

Publication number: JPH01147706U
Application number: JP3796488U
Authority: JP
Priority date: 1988-03-23
Filing date: 1988-03-23
Publication date: 1989-10-12

Description

[Brief explanation of the drawing]

第１図はこの考案のクレーム対応図、第２図は
この考案の一実施例の概略ブロツク図、第３図は
この実施例の共振回路用コイル６２Ａ，６２Ｂと
発振器用コイル７６の相対位置関係を示す斜視図
、第４図はこの実施例の具体的な基本回路図であ
る。第５図は従来例の断面図、第６図は従来例の
制御器の構成図、第７図Ａ、第７図Ｂは圧力スイ
ツチ１３のオン、オフに対応する共振回路の作動
説明図である。５２……共振回路、５３……制御電圧発生手段
、５４……発振器、５５……判定手段、５６……
測定手段、５７……表示装置、６１……ＬＣ共振
回路、６２……コイル、６２Ａ……小コイル、６
２Ｂ……大コイル、６３……コンデンサ、６４…
…鉄心、６５……圧力センサ、７３……モノマル
チバイブレータ、７４……積分器、７５……発振
器、７６……発振器用コイル、７９……コンパレ
ータ、８０……ラツチ、８１……サンプル／ホー
ルド回路。 Fig. 1 is a diagram corresponding to the claims of this invention, Fig. 2 is a schematic block diagram of an embodiment of this invention, and Fig. 3 is the relative positional relationship between the resonant circuit coils 62A, 62B and the oscillator coil 76 of this embodiment. FIG. 4 is a specific basic circuit diagram of this embodiment. FIG. 5 is a sectional view of a conventional example, FIG. 6 is a configuration diagram of a conventional controller, and FIGS. 7A and 7B are explanatory diagrams of the operation of a resonance circuit corresponding to turning on and off the pressure switch 13. be. 52... Resonance circuit, 53... Control voltage generation means, 54... Oscillator, 55... Judgment means, 56...
Measuring means, 57... Display device, 61... LC resonance circuit, 62... Coil, 62A... Small coil, 6
2B...Large coil, 63...Capacitor, 64...
... Iron core, 65 ... Pressure sensor, 73 ... Mono multivibrator, 74 ... Integrator, 75 ... Oscillator, 76 ... Oscillator coil, 79 ... Comparator, 80 ... Latch, 81 ... Sample/hold circuit.

Claims

[Scope of utility model registration request]

a resonant circuit provided on the tire side and whose resonant frequency changes in response to tire pressure; a means for generating a voltage with a gradually increasing waveform at a constant cycle; provided on the vehicle body side at all times facing the resonant circuit; an oscillator whose oscillation frequency changes according to the voltage of the gradually increasing waveform; means for determining whether the changing oscillation frequency matches the resonant frequency; means for measuring a control voltage when the oscillation frequency matches; What is claimed is: 1. A tire pressure detection device comprising: a device for displaying the detected voltage as an amount equivalent to tire pressure.