Vehicle electronic key system

Details Vehicle electronic key system Vehicle electronic key system

2006-04-24

2010-12-14

Lee, Benjamin C (Department: 2612)

Communications: electrical

Selective

Monitoring in addition to control

C340S870030, C340S426170, C340S005610, C455S562100

Reexamination Certificate

active

07852194

ABSTRACT:
To ensure a perform authentication based on a request signal Sr which is the authorized radio signal even under a bad radio environment in which radio noise comes continuously. A portable device receives a request signal Sr transmitted from a vehicle-mounted device and transmits an answer signal including a receiving-sensitivity changing switch for changing a receiving sensitivity of a receiving circuit which receives the request signal Sr. As a result, even if the authentication cannot be carried out with normal receiving sensitivity due to the influence of the continuous radio noise, by changing the receiving sensitivity to low sensitivity, and by bringing the portable device physically close to a transmission source of the request signal which is the authorized radio signal, it is possible to dramatically increase the probability that the authentication based on the authorized radio signal can be carried out.

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