TIRE PRESSURE MONITORING DEVICE
First Claim
1. A tire pressure monitoring device comprising:
- sensor units provided on respective wheels of a motor vehicle; and
a receiving apparatus which is provided on a vehicle body of the motor vehicle and receives data signals of tire pressures wirelessly sent at substantially the same output levels from the sensor units, whereinthe 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 receiving antennas;
a reception intensity level detecting means for detecting reception intensity levels of the received data signals outputted from the sensor units;
a front-wheel/rear wheel judging means for judging, based on the reception intensity level, whether the wheel, provided with the senor 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 collide with each other.
1 Assignment
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Accused Products
Abstract
In a tire pressure monitoring device, a receiving apparatus 1 detects a received signal level from sensor units 2 to judge, based on the signal level, tires, a front wheel or a rear wheel, provided with the sensor units 2. It estimates collision of data signals from the sensor units 2a, 2b of the front wheel and from the sensor units 2c 2d of the rear wheels. When it estimates that the data signals from the sensor units 2a, 2b of the front wheel and from the sensor units 2c 2d of the rear wheels collide with each other, it executes a process for acting an antenna shifting part 13 so as to produce a difference between the reception intensity levels.
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Citations
8 Claims
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1. A tire pressure monitoring device comprising:
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sensor units provided on respective wheels of a motor vehicle; and a receiving apparatus which is provided on a vehicle body of the motor vehicle and receives 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 receiving antennas; a reception intensity level detecting means for detecting reception intensity levels of the received data signals outputted from the sensor units; a front-wheel/rear wheel judging means for judging, based on the reception intensity level, whether the wheel, provided with the senor 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 collide with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification