Patent ID: 9396596
Filing Date: 2016-07-19
CPC Classification: G07C

Claim Text:
1. A smartkey system comprising: a fob; and a smartkey electronic control unit (SMK ECU) configured to measure a received signal strength indicator (RSSI) value of radio frequency (RF) noise received through an RF communication module when transmitting a presence check request signal to the fob, check whether the measured RSSI value of the RF noise is less than a presence determination reference value used to determine presence of the fob, measure an RSSI value of a response signal received from the fob in response to the presence check request signal when the measured RSSI value of the RF noise is less than the presence determination reference value as the check result, and determine there to be the fob registered in a vehicle when the measured RSSI value of the response signal is equal to or greater than the presence determination reference value.