TIRE AIR PRESSURE MANAGEMENT DEVICE FOR VEHICLE AND TIRE FOR VEHICLE CAPABLE OF OUTPUTTING AIR PRESSURE INFORMATION

摘要

PROBLEM TO BE SOLVED: To provide a practicable tire air pressure management device and a tire for a vehicle which can output air pressure information.

SOLUTION: A vibration generation is carried out by the relative parallel movement of a ferroelectric substance having a floating electrode arranged in parallel in the tire and a movable member in which an electret maintaining the surface potential of almost a 100-volt at a temperature of 100°C and an counter electrode are alternately arranged to supply power to a tire air pressure sensor and a radio communication part. A function of the air pressure sensor or the radio communication part is held until a quantity of stored power becomes sufficient. An alarm is output that air pressure data are not transmitted from the tire for a prescribed time though vibration is generate. Even if the power of the vehicle is stopped, a user waits to check air pressure by external vibration. An elapsed change of the air pressure data of the same tire is processed. When the air pressure data of four wheels are not set within a prescribed time, an alarm is output. The air pressure of the four wheels is cross-checked. A measured value in the tire is corrected by an external air pressure measured value.

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