System for determining authorized communication between electronic key and vehicle, has electronic control unit to determine whether communication is authorized based on reception signal strength indicator of radio waves computed by key

摘要

The system (3) has a transmission implementation unit (25) that transmits radio waves while communication sequence is changed by a verification electronic control unit (ECU) (9). A reception signal strength calculator (26) of an electronic key (2) calculates the reception signal strength indicator (RSSI) of the radio waves of ECU. A communication determination unit (31) of ECU, determination whether the communication is authorized or not based on the computed RSSI of radio waves.