Keyless entry system and keyless entry method

A keyless entry method utilizing a keyless entry system, which comprises a key device for carrying out locking and unlocking operations, a mobile terminal including a mobile-terminal transmitting/receiving unit for transmitting user-ID number data for identifying a user of the key device, and a key security system including a key-device transmitting/receiving unit for receiving the user-ID number data transmitted from the mobile terminal, said keyless entry method comprising the steps of:

• storing key-device ID number data in a Bluetooth transmitting/receiving unit of the key device in advance;
• storing the user-ID number data in the mobile terminal operated by the user of the key device in advance;
• transmitting the user-ID number data from the mobile terminal to the Bluetooth transmitting/receiving unit of the key device;
• comparing the user-ID number data received by the Bluetooth transmitting/receiving unit of the key device with the key-device ID number data stored in the Bluetooth transmitting/receiving unit of the key device in advance by using an ID-number data comparison unit;
• transmitting an unlock enable signal to a key-device ECU when the two number data match;
• and
• unlocking the key device by transmitting a lock control signal from the key-device ECU to the key device in response to reception of the unlock enable signal.

A mounted side unit in a keyless entry system, comprising:

• a key device for carrying out locking and unlocking operations;
• and a key security system comprising a key device transmitting and receiving unit for receiving user-ID number data used for identifying a user of the key device from a terminal,
• said key security system comprising:
• an ID-number data comparison unit for recognizing a fact that key-device ID number data pre-stored in the key device is identical to the received user-ID number data;
• and a key-device ECU for receiving an unlock enable signal and outputting a lock control signal to the key device so as to unlock the key device by the unlock signal.