Electronic key system
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United States of America Patent
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Jun 7, 2022
Grant Date -
Aug 22, 2019
app pub date -
Oct 25, 2017
filing date -
Oct 28, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
An electronic key system determines that legitimate communication has been performed on the basis of conditions including that a measured distance from a ranging request unit to a ranging response unit measured on the basis of a ranging request signal and a ranging response signal is within a threshold range that is set on the basis of the distance from a communication area of a transmission antenna where an electronic key is determined to be located by a key location determination unit to one of either the ranging request unit or the ranging response unit that is provided in an on-board device.
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