TIRE INFORMATION MONITORING APPARATUS
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Accused Products
Abstract
The changing of the azimuth of directivity in which the azimuth of directivity of the antenna that achieves the maximum gain thereof is switched to the azimuths of tires is performed repeatedly for a plurality of cycles during a transmission duration of information. The output value of the antenna whose azimuth of directivity is controlled is sampled separately for each of the azimuths of directivity subjected to the switching. The sampled values are sorted into groups separately for each azimuth of directivity, and are accumulated separately for each group. The position of the tire shown by the azimuth of directivity of the group whose accumulated value is the largest is determined as being the position of the tire equipped with the transmitter that is transmitting the information.
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Citations
18 Claims
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1-10. -10. (canceled)
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17. A tire information monitoring apparatus that monitors state of each of tires, comprising:
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transmitters which are provided individually for the tires of a vehicle and each of which intermittently transmits information detected about a corresponding one of the tires, an antenna that is attached to the vehicle and that receives the information transmitted by the transmitters; a directivity control device that controls an azimuth of directivity of the antenna so that changing of the azimuth of directivity, in which the azimuth of directivity that achieves a maximum gain of the antenna is switched to an azimuth of a position of each of the tire, is performed repeatedly for a plurality of cycles during a transmission duration of the information; a sampling device that samples a value received by the antenna that is controlled by the directivity control device, separately for each of the azimuths of directivity that is switched to the azimuth of the position of each of the tire; an accumulation device that sorts the values sampled by the sampling device into groups separately for each of the azimuth of directivity that is switched to the azimuth of the position of each of the tire, and accumulating the values separately for each of the group; an azimuth determination device that determines the position of the tire shown by the azimuth of directivity of the group whose value accumulated by the accumulation device is the largest of the values of the groups accumulated by the accumulation device as being the position of the tire equipped with the transmitter that is transmitting the information. - View Dependent Claims (11, 12, 13)
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18. A tire information monitoring apparatus that monitors state of each of tires, comprising:
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transmitters which are provided individually for the tires of a vehicle and each of which intermittently transmits information detected about a corresponding one of the tires, an antenna that is attached to the vehicle and that receives the information transmitted by the transmitters; a directivity control device that controls an azimuth of directivity of the antenna so that changing of the azimuth of directivity, in which the azimuth of directivity that achieves a maximum gain of the antenna is switched to an azimuth of a position of each of the tire, is performed repeatedly for a plurality of cycles during a transmission duration of the information; a sampling device that samples a value received by the antenna that is controlled by the directivity control device, separately for each of the azimuths of directivity that is switched to the azimuth of the position of each of the tire; a number-of-incidents-of-largest-value count device which determines the azimuth of directivity that has, among the azimuths of directivity, a largest value that is sampled by the sampling means in the each cycle of the changing of the azimuth of directivity, and which counts a number of incidents of having the largest value separately for each of the azimuth of directivity that is switched to the azimuth of the position of each of the tire; and an azimuth determination device that determines the position of the tire shown by the azimuth of directivity whose number of incidents counted by the number-of-incidents-of-largest-value count means is the largest among the azimuths of directivity as being the position of the tire equipped with the transmitter that is transmitting the information. - View Dependent Claims (14, 15, 16)
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Specification