Patent ID: 8296006

Claim:
A tire pressure monitoring device comprising: sensor units provided on respective wheels of a motor vehicle; and a receiving apparatus provided on a vehicle body of the motor vehicle and configured to receive data signals of tire pressures wirelessly sent at substantially the same output levels from the sensor units, wherein the receiving apparatus includes: at least two receiving antennas located apart from each other in a longitudinal direction of the motor vehicle; an antenna shifting means for shifting the at least two receiving antennas; a reception intensity level detecting means for detecting reception intensity levels of received data signals outputted from the sensor units; a front-wheel/rear wheel judging means for judging, based on the reception intensity levels, whether the wheel, provided with the sensor unit from which the data signal is received, is a front wheel or a rear wheel; a signal collision estimating means for estimating whether the data signal from the sensor unit of the front wheel and the data signal from the sensor unit of the rear wheel collide with each other; and a shifting control means for actuating the antenna shifting means so that the reception intensity levels depart from each other when the data signal from the sensor unit of the front wheel and the data signal from the sensor unit of the rear wheel are estimated to collide with each other.