System for alarming upon occurrence of secession of smart key for vehicles

A system for alarming on occurrence of secession of a smart key for a vehicle, which is configured to operate a vehicle automatic device using the smart key to perform the startup of the vehicle engine or the automatic opening/closing of the door, the system comprising:

• a signal generation unit installed at the vehicle and configured to periodically generate a wireless communication signal based on a regular rule;
• a signal response unit installed at the smart key and configured to receive the wireless communication signal from the signal generation unit and generate a response signal in response to the received wireless communication signal for transmission to the signal generation unit;
• a signal analysis unit electrically connected to the signal generation unit and configured to analyze the response signal transmitted to the signal generation unit according to a predetermined condition;
• and
• an alarm generation unit configured to produce a predetermined alarm signal based on a result of the analysis of the signal analysis unit,
• whereby when the smart key secedes from the vehicle by a predetermined distance or the signal generation unit does not receive the response signal from the signal response unit in a state in which the engine of the vehicle is started, the alarm signal is produced from the alarm generation unit.