| 摘要 |
A wheel-state obtaining apparatus for a vehicle, including wheel-side devices ( 10-16 ) each having an air pressure sensor ( 32 ) for detecting an air pressure of a wheel tire of the vehicle, and a body-side device ( 18 ) having receiver antennas ( 20-26 ) and arranged to receive wheel-side information from the wheel-side devices through the receiver antennas and extract air-pressure information representative of the detected air pressure, that is, detected-air-pressure information, and wherein the body-side device includes an estimating portion ( 54 ) which is operable, in the event of a failure of any of the receiver antennas to receive the wheel-side information, to estimate the tire air pressure on the basis of detected speeds of the wheel, and obtain estimated-air-pressure information representative of the estimated air pressure. Thus, the wheel-state obtaining apparatus is capable of obtaining information on the air pressure even in the event of a failure of the receiver antennas ( 20-26 ) to receive the wheel-side information.
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