Patent ID: 7817025

Claim:
An apparatus for detecting positions of a plurality to wheels of a vehicle, the wheels including right and left front wheels and right and left rear wheels and being attached to a body of the vehicle, comprising: a first triggering device attached to the body to output a triggering signal including information indicating that the triggering signal from the first trigging device is for the front wheels; a second trigging device attached to the body to output a triggering signal including information indicating that the triggering signal from the second trigging device is for the rear wheels; a plurality of transceivers respectively attached to the front and rear four wheels, each of the transceivers being configured to receive the triggering signal, calculate a reception intensity of the triggering signal, store, into a frame to be transmitted, both data indicating the reception intensity and the information indicating that the triggering signal is for either the front or rear wheels, and transmit the frame processed; and a first receiver attached to the body and provided with a second receiver that receives the frame transmitted from the transceivers and a first processing unit that processes the received frame to read out both the data and the information from the received frame and use the read-out data and information so as to detect the positions of the wheels by determining which transceiver is attached to which wheel, wherein the first and second triggering devices are configured to output the triggering signals simultaneously.