PROBLEM TO BE SOLVED: To provide an air pressure drop detection device which can detect an air pressure state of a tire from a rotation signal of a wheel during travel, and can be mounted to a vehicle without providing a special sensor on a rotation side member and without significant increase in cost.SOLUTION: An air pressure drop detection device for automobile tire includes a signal processing unit 3 which extracts variation in rotation speed synchronized with rotation from a rotation signal detected by a rotation sensor 2 for detecting wheel speed, and extracts a rotation speed variation pattern synchronized with rotation from the extracted variation in rotation speed, and an air pressure state determination unit 4 which estimates an air pressure state of a tire 1a on the basis of a cross-correlation pattern between a rotation speed variation pattern to be reference and the extracted rotation speed variation pattern to output air pressure information.

    【課題】 タイヤの空気圧状態を、走行中の車輪の回転信号から検出することができて、回転側部材に特殊なセンサを設ける必要がなく、大幅にコストアップすることなく、車両に実装することができる空気圧低下検知装置を提供する。【解決手段】 車輪速を検出する回転センサ2の検出した回転信号から回転に同期した回転速度の変動を抽出し、この抽出した回転速度の変動から回転に同期した回転速度変動パターンを抽出する信号処理ユニット3を設ける。基準となる回転速度変動パターンの前記抽出された回転速度変動パターンとの相互相関パターンに基づいてタイヤ1aの空気圧状態を推定し空気圧情報を出力する空気圧状態判断ユニット4を設ける。【選択図】 図1


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    Title :

    AIR PRESSURE DROP DETECTION DEVICE FOR AUTOMOBILE TIRE


    Additional title:

    自動車用タイヤの空気圧低下検知装置


    Contributors:

    Publication date :

    2015-06-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60C VEHICLE TYRES , Fahrzeugreifen



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