To determine a road surface state, particularly, the occurrence of hydro-planing, and to determine a classification of an installation tire, without installing an acceleration sensor on a tire.SOLUTION: A μ gradient detection device 30 comprises a detection part 32 for detecting vibration of a vehicle, a storage part 34 for storing a vehicle vibration characteristic with a μ gradient as a parameter and a μ gradient detection part 36 for detecting reduction in the μ gradient by collating the detected vibration and the vehicle vibration characteristic. An installation tire determination part 40 determines that a studless tire is installed when detecting reduction in the μ gradient when a vehicle speed detected by a vehicle speed detection part 38 is less than a hydro-planing occurrence vehicle speed. When a vehicle speed detected by the vehicle speed detection part 38 is the hydro-planing occurrence vehicle speed or more, a determination is made that hydro-planing is caused when detecting reduction in the μ gradient in a studless tire uninstallation.SELECTED DRAWING: Figure 6

    【課題】タイヤに加速度センサ等を装着することなく、路面状態、特にハイドロプレーニングの発生を判定し、また、装着タイヤの種別を判定する。【解決手段】μ勾配検出装置30は、車両の振動を検出する検出部32と、μ勾配をパラメータとして車両振動特性を記憶する記憶部34と、検出された振動と車両振動特性とを照合することによりμ勾配の低下を検出するμ勾配検出部36を備える。装着タイヤ判定部40は、車速検出部38で検出された車速がハイドロプレーニング発生車速未満の場合にμ勾配の低下が検出されるとスタッドレスタイヤの装着と判定する。車速検出部38で検出された車速がハイドロプレーニング発生車速以上の場合は、スタッドレスタイヤ未装着でμ勾配の低下が検出されるとハイドロプレーニング発生と判定する。【選択図】図6


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    Titel :

    μ GRADIENT DETECTION DEVICE, INSTALLATION TIRE DETERMINATION DEVICE, ROAD SURFACE STATE DETERMINATION DEVICE, INSTALLATION TIRE AND ROAD SURFACE STATE DETERMINATION DEVICE


    Weitere Titelangaben:

    μ勾配検出装置、装着タイヤ判定装置、路面状態判定装置、装着タイヤ及び路面状態判定装置


    Beteiligte:

    Erscheinungsdatum :

    2019-06-24


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    B60C VEHICLE TYRES , Fahrzeugreifen / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / G01N Untersuchen oder Analysieren von Stoffen durch Bestimmen ihrer chemischen oder physikalischen Eigenschaften , INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES / G01W METEOROLOGY , Meteorologie



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