Patent ID: 6983649

Claim:
A tire condition monitoring apparatus for monitoring conditions of tires, the tires including left and right front tires provided at a front section of a vehicle and left and right rear tires provided at a rear section of the vehicle, the apparatus comprising: a plurality of transmitters, each of which is provided in one of the tires, wherein each transmitter includes a condition detecting device for detecting the condition of the corresponding tire, and an acceleration detecting device for detecting the direction of acceleration accompanying rotation of the corresponding tire, wherein each transmitter wirelessly transmits data containing data representing the condition of the tire detected by the condition detecting device and data representing the direction of the acceleration detected by the acceleration detecting device; a first reception antenna provided in the vehicle to correspond to the left and right front tires, wherein the first reception antenna receives data from the transmitters of the left and right front tires; a second reception antenna provided in the vehicle to correspond to the left and right rear tires, wherein the second reception antenna receives data from the transmitters of the left and right rear tires; and a receiver that receives data from the transmitters, wherein, when receiving data from one of the transmitters, the receiver determines the position of the tire in which the transmitter that is the source of the data is provided based on the levels of received signals each sent from the first reception antenna and the second reception antenna.