Patent ID: 6885292

Claim:
A tire condition monitoring apparatus for monitoring conditions of tires, the tires including a front tire provided at a front section of a vehicle and a rear tire 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 repeater that receives data from the transmitter provided in the front tire or data from the transmitter provided in the rear tire, wherein, when receiving data from any of the transmitters, the repeater wirelessly transmits a response signal when a predetermined period has elapsed after the reception of the data; and a receiver that receives data from the transmitters and the response signal from the repeater, wherein, based on whether the receiver has received the response signal from the repeater after 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.