Denso Corporation

Shinichiro Kato

Kazuhiro Nakashima

Masahiro Sugiura

A mobile device for an authentication system that performs authentication to control an authentication target with code verification via near field wireless communication, includes: an acceleration sensor; a communication portion that performs the near field wireless communication with an antenna of the authentication target; a reception stop portion that stops reception operation of the communication portion; a fault detection portion that detects a failure in the acceleration sensor; and an operation change portion that prevents the reception stop portion from stopping the reception operation.

Mobile device and authentication system

An in-vehicle device notifies a mobile device of a frequency channel which has been stored in its memory unit, and sets the notified channel to a reception channel. The mobile device transmits a reply signal through the channel notified from the in-vehicle device. When the in-vehicle device determines that a code included in the received reply signal is identical with a code specific to a vehicle, the in-vehicle device stores the channel used for receiving the reply signal in its memory unit. As a result, each communication is conducted through the same channel, which enabled the successful communication previously, thereby enhancing the certainty of communication.

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Kariya, Japan

Shinichiro Kato