To detect that air pressure of a tire has decreased, while suppressing increase in a computation load.SOLUTION: A tire air pressure drop detector comprises: a reference consumption efficiency deriving unit M15 which derives reference consumption efficiency EFFB which is an index value based on consumption efficiency EFF of energy of a vehicle when the vehicle travels in a predetermined traveling section PRD during an initial period after air pressure is filled in a tire; an after-lapse consumption efficiency deriving unit M17 which derives after-lapse consumption efficiency EFFA which is the index value based on the consumption efficiency EFF when the vehicle travels in the predetermined traveling section PRD during a measurement period after the lapse of the initial period; a deviation determination unit M19 which determines whether or not the after-lapse consumption efficiency EFFA deviates from the reference consumption efficiency EFFB; and a reduction detection unit M21 which detects that air pressure of a tire has decreased, when it is determined that the after-lapse consumption efficiency EFFA deviates from the reference consumption efficiency EFFB.SELECTED DRAWING: Figure 2

    【課題】演算負荷の増大を抑制しつつ、タイヤの空気圧が低下したことを検知できるようにすること。【解決手段】タイヤ空気圧低下検知装置は、タイヤに空気圧が充填されてからの初期期間の間に所定の走行区間PRDを車両が走行した場合の当該車両のエネルギーの消費効率EFFに基づいた指標値である基準消費効率EFFBを導出する基準消費効率導出部M15と、初期期間の経過後における計測期間の間に所定の走行区間PRDを車両が走行した場合の消費効率EFFに基づいた指標値である経過後消費効率EFFAを導出する経過後消費効率導出部M17と、経過後消費効率EFFAが基準消費効率EFFBから乖離しているか否かを判定する乖離判定部M19と、経過後消費効率EFFAが基準消費効率EFFBから乖離していると判定された場合に、タイヤの空気圧が低下したことを検知する低下検知部M21と、を備えている。【選択図】図2


    Access

    Download


    Export, share and cite



    Title :

    TIRE AIR PRESSURE DROP DETECTOR, AND TIRE AIR PRESSURE DROP DETECTION METHOD


    Additional title:

    タイヤ空気圧低下検知装置、及びタイヤ空気圧低下検知方法


    Contributors:

    Publication date :

    2025-04-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60C VEHICLE TYRES , Fahrzeugreifen



    AIR PRESSURE DROP DETECTION DEVICE FOR AUTOMOBILE TIRE

    TAKAHASHI TORU / NISHIKAWA KENTARO / FUKUSHIMA YASUYUKI et al. | European Patent Office | 2015

    Free access

    BUILT-IN TIRE PRESSURE MONITORING DEVICE AND SIGNALLING OF PRESSURE DROP

    LU HONGYAN | European Patent Office | 2016

    Free access

    Tire Pressure Detector

    TAKI YUJI | European Patent Office | 2017

    Free access

    Tire pressure detector

    TAKI YUJI | European Patent Office | 2019

    Free access