Mobile device and electronic key system for wireless communication with vehicle device

A mobile device configured to wirelessly communicate with a vehicle device mounted on a vehicle, comprising:

• a receiving unit configured to receive a response request signal transmitted from the vehicle device by adopting a radio wave at a predetermined vehicle transmission frequency;
• a response signal generation unit configured to generate a response signal in response to the response request signal based on the response request signal received by the receiving unit;
• a transmission unit configured to transmit the response signal generated by the response signal generation unit;
• a charging unit configured to charge a built-in battery with an electric power supplied wirelessly or through wire from a power supply device;
• a charge state determination unit configured to determine whether the charging unit is charging the built-in battery;
• and
• a movement sensor configured to detect that the mobile device is moving,
• wherein the mobile device is configured not to transmit the response signal, in a situation where the charge state determination unit determines that the charging unit is charging the built-in battery,
• wherein the charging unit includes a wired charging unit configured to charge the built-in battery with an electric power supplied from the power supply device through a power feeder cable,
• wherein the mobile device is configured not to transmit the response signal, in a situation in which the charge state determination unit determines that the wired charging unit is charging the built-in battery, and
• wherein the mobile device is configured to transmit the response signal even though the charge state determination unit determines that the wired charging unit is charging the built-in battery, in a situation where the movement sensor detects that the mobile device is moving.

A vehicle electronic key system comprising:

• a vehicle device mounted on a vehicle;
• and
• a mobile device which is associated with the vehicle device and carried by a user of the vehicle
• wherein the vehicle device performs a predetermined vehicle control on the vehicle based on a successful authentication process by a wireless communication between the vehicle device and the mobile device,
• wherein the mobile device includes:
• a receiver configured to receive a response request signal transmitted from the vehicle device;
• a response signal generator configured to generate a response signal in response to the response request signal based on the response request signal received by the receiver;
• a transmitter configured to transmit the response signal generated by the response signal generator;
• a charger configured to charge a built-in battery with an electric power supplied wirelessly or through wire from a power supply device;
• and
• a charge state determiner configured to determine whether the charger charges the built-in battery,
• wherein the vehicle device includes:
• a vehicle-side transmitter configured to transmit a signal which includes the response request signal and is directed to the mobile device;
• a vehicle-side receiver configured to receive the response signal;
• an in-vehicle charger configured as the power supply device;
• and
• a power transmission controller configured to detect whether the in-vehicle charger is supplying the electric power to the mobile device, and transmit a vehicle charge notification signal toward the mobile device in cooperation with the vehicle-side transmitter, in response to detecting that the in-vehicle charger is supplying the electric power to the mobile device, the vehicle charge notification signal indicating that the power supply device is the in-vehicle charger,
• wherein the charge state determiner of the mobile device is further configured to identify whether the power supply device is the in-vehicle charger based on the vehicle charge notification signal transmitted from the vehicle device, in a situation where the charge state determiner of the mobile device determines that the charger is charging the built-in battery, and
• wherein the mobile device is configured to:
• transmit the response signal in a situation where the charge state determination unit determines that the power supply device is the in-vehicle charger and determines that the charger is charging the built-in battery;
• and
• not to transmit the response signal in a situation where the charge state determination unit determines that the power supply device is not the in-vehicle charger.