Highly reliable direct-type tire inflation pressure sensing apparatus

A tire inflation pressure sensing apparatus comprising:

• a plurality of pressure sensors each of which is provided on one of a plurality of wheels of a vehicle, each of said pressure sensors working to sense an inflation pressure of a tire mounted on a corresponding one of the wheels and generate a pressure signal representative of the sensed inflation pressure of the tire;
• a plurality of transmitters each of which is provided on a body of the vehicle away from a corresponding one of the wheels by a given distance, each of said transmitters being configured to constantly send out a predetermined radio wave;
• a plurality of transceivers each of which is provided on one of the wheels of the vehicle, each of said transceivers being configured to receive the predetermined radio wave sent out from a corresponding one of said transmitters, monitor a level of the received predetermined radio wave, and send out the pressure signal generated by a corresponding one of said pressure sensors when a transmission of the pressure signal is required and the level of the received predetermined radio wave has reached a predetermined level;
• a receiver provided on the body of the vehicle, said receiver being configured to receive the pressure signals sent out from said transceivers;
• and
• a determining device provided on the body of the vehicle, said determining device being configured to determine the inflation pressures of the tires based on the pressure signals received via said receiver.

A tire inflation pressure sensing apparatus comprising:

• a plurality of pressure sensors each of which is provided on one of a plurality of wheels of a vehicle, each of said pressure sensors working to sense an inflation pressure of a tire mounted on a corresponding one of the wheels and generate a pressure signal representative of the sensed inflation pressure of the tire;
• a plurality of first transceivers each of which is provided on one of the wheels of the vehicle, each of said first transceivers being configured to receive a predetermined radio wave, monitor a level of the received predetermined radio wave, and send out the pressure signal generated by a corresponding one of said pressure sensors when a transmission of the pressure signal is required and the level of the received predetermined radio wave has reached a predetermined level;
• a plurality of second transceivers each of which is provided on a body of the vehicle away from a corresponding one of said first transceivers by a given distance, each of said second transceivers being configured to constantly send out the predetermined radio wave and receive the pressure signal sent out from the corresponding one of said first transceivers;
• and
• a determining device provided on the body of the vehicle, said determining device being configured to determine the inflation pressures of the tires based on the pressure signals received via said second transceivers.