Communication system for vehicle

Abstract

A communication system for a vehicle includes a portable identification device including a portion for receiving an interrogation signal and a portion for transmitting an indication indicative signal responsive to the interrogation signal, multiple tire sensor devices each of which includes a portion for receiving an initiation signal and a portion for transmitting a condition indicative signal responsive to the initiation signal, multiple transmitting devices each of which emits the interrogation signal and the initiation signal for different conditions within a communication area, a receiving device for receiving the indication indicative signal and the condition indicative signal, and a central controller for unlocking a door lock device when the portable identification device is determined to be in an overlapped area based on a condition of the portable identification device, the overlapped area being defined between two adjacent communication areas and in which the door lock device is involved.

1 . A communication system for a vehicle, comprising:
 a portable identification device allowing keyless entry into the vehicle, including means for receiving an interrogation signal and means for transmitting an indication indicative signal responsive to the interrogation signal;   a plurality of tire sensor devices, each of the tire sensor devices serving for providing information regarding a condition at a tire of the vehicle, each of the tire sensor devices including means for receiving an initiation signal and means for transmitting a condition indicative signal responsive to the initiation signal;   a plurality of transmitting devices provided adjacent to the respective tire sensor devices, each of the transmitting devices emitting the interrogation signal and the initiation signal for different conditions within a communication area;   a receiving device for receiving the indication indicative signal from the portable identification device and the condition indicative signal from each of the tire sensor devices; and   a central controller for unlocking a door lock device when the portable identification device is determined to be in an overlapped area based on a condition of the portable identification device, the overlapped area being defined between two adjacent communication areas and in which the door lock device is involved.   
     
     
         2 . The communication system according to  claim 1 , wherein the condition of the portable identification device is that the portable identification device transmits the indication indicative signal within predetermined time duration. 
     
     
         3 . The communication system according to  claim 1 , wherein the adjacent communication areas are reduced to delete the overlapped area therebetween. 
     
     
         4 . The communication system according to  claim 3 , wherein the reduced communication area is defined to include only one tire sensor device. 
     
     
         5 . The communication system according to  claim 1 , further comprising another door lock device located at a rear portion of the vehicle, wherein the another door lock device falls in an overlapped area when the two adjacent communication areas are in a width direction of the vehicle.