Patent ID: 9538473
Date: 2017-01-03
CPC Classifications: B60R,H04W,Y02D

Claim:
1. A vehicle remote control key system, comprising: a radio frequency (RF) receiver receiving an RF signal which is sent out from a remote control key or retransmitted from another vehicle, the RF signal includes an identification (ID) and operation information to remotely control a target vehicle based on a remote control key operation; a transmitter retransmitting the RF signal; and a controller having a memory and a processor and configured to: wherein the controller analyzes the frame of the RF signal to determine whether the ID of the RF signal received by the RF receiver is available, wherein the controller switches from a sleep mode into a wake-up mode, detects an operation instruction in the RF signal, and executes the corresponding instruction in response to determining that the ID is available, wherein the controller determines whether the ID of the RF signal is on the retransmission list in response to determining that the ID is unavailable, wherein the controller compares the count bit of the RF signal with the increased count bit stored on the retransmission list when the ID of the RF signal is on the retransmission list, wherein the controller disregards the RF signal when the ID is unavailable and the same as the ID stored on the retransmission list, and the count bit of the RF signal is equal to or greater than the increased count bit stored on the retransmission list, without retransmitting the RF signal, and wherein the first condition is that the ID of the RF signal is not on the retransmission list or the count bit of the RF signal is less than the increased count bit stored on the retransmission list.