VEHICLE COMMUNICATION SYSTEM, VEHICLE-MOUNTED DEVICE, AND PORTABLE DEVICE
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United States of America Patent
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Issued Date -
Jun 22, 2017
app pub date -
Dec 16, 2016
filing date -
Dec 17, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A vehicle communication system includes: a vehicle-mounted device and a portable. The portable device further includes a noise detection unit which detects a noise, and the vehicle-mounted device includes a transmission frequency switching unit which switches a transmission frequency of a response request signal transmitted by a vehicle-mounted-device transmission unit. The portable device transmits a retransmission request signal, which requests that the response request signal he retransmitted, by the portable-device transmission unit in a case where the portable device detects the noise and the response request signal is not able to he received by a portable-device reception unit. The vehicle-mounted device switches the transmission frequency by the transmission frequency switching unit and retransmits the response request signal by the vehicle-mounted-device transmission unit in a case where the retransmission request signal is received by the vehicle-mounted-device reception unit.
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