PROBLEM TO BE SOLVED: To improve crime prevention property against a relay attack, and convenience and communication responsiveness of a user concerning a vehicle communication system including an on-vehicle apparatus and a portable device.SOLUTION: An on-vehicle apparatus 10 transmits a first response request signal, a second response request signal having a weaker intensity compared with the first response request signal, and a third response request signal having a weaker intensity compared with the second response request signal from an on-vehicle apparatus transmission section 2. A portable device 20 receives the respective response request signals, detects the intensities by a signal intensity detection section 21b, and returns a response signal including the intensities. When the response signals are received, a control section 1 of the on-vehicle apparatus 10 determines success/failure concerning a first condition that an intensity difference between the first response request signal and the second response request signal is larger than a first threshold, a second condition that an intensity difference between the second response request signal and the third response request signal is larger than a second threshold, and a third condition that an intensity difference between the first response request signal and the third response request signal is larger than a third threshold. When any one of the conditions is established, control of a door lock device 5 is permitted.SELECTED DRAWING: Figure 1

    【課題】車載機と携帯機から成る車両通信システムにおいて、リレーアタックに対する防犯性と、利用者の利便性および通信応答性を向上させる。【解決手段】車載機10は、車載機送信部2により、第1応答要求信号、第1応答要求信号より強度の弱い第2応答要求信号、および第2応答要求信号より強度の弱い第3応答要求信号を送信する。携帯機20は、各応答要求信号を受信して、これらの強度を信号強度検出部21bにより検出し、該強度を含んだ応答信号を返信する。車載機10の制御部1は、応答信号を受信すると、第1応答要求信号と第2応答要求信号の強度差が第1閾値より大きいという第1条件、第2応答要求信号と第3応答要求信号の強度差が第2閾値より大きいという第2条件、第1応答要求信号と第3応答要求信号の強度差が第3閾値より大きいという第3条件の成否を判断する。いずれかの条件が成立すると、ドアロック装置5の制御が許可される。【選択図】図1


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    Title :

    VEHICLE COMMUNICATION SYSTEM, ON-VEHICLE APPARATUS, AND PORTABLE DEVICE


    Additional title:

    車両通信システム、車載機、携帯機


    Contributors:

    Publication date :

    2018-04-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H04Q Wähltechnik , SELECTING / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / E05B LOCKS , Schlösser



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