Wheel registration apparatus and tire pressure monitoring system including the same

A wheel registration apparatus applied to a vehicle in which four traveling wheels provided with tires are attached to a vehicle body, the wheel registration apparatus comprising:

• a transmitter that is provided on each of the four traveling wheels and has a first controller configured to create and transmit a frame including unique identification information;
• and
• a receiver that is provided on the vehicle body, receives the frames transmitted by the transmitters provided on the four traveling wheels via a reception antenna in a registration mode, and has a second controller configured to register four pieces of the identification information included in the respective frames as pieces of identification information of the transmitters provided on current four traveling wheels,
• wherein:
• in the registration mode, the second controller registers the four pieces of the identification information included in the frames transmitted by the transmitters provided on the four traveling wheels as one wheel set, and registers a plurality of the wheel sets in response to that tire replacement is performed;
• in response to that the registration mode is entered again after the plurality of the wheel sets are registered, the second controller takes as a pre-replacement set, the wheel set registered when the registration mode is entered and determines a candidate set from the wheel set registered in past and different from the pre-replacement set among the plurality of the wheel sets;
• and
• upon reception of the frames including the four pieces of the identification information included in the candidate set, the second controller registers the four pieces of the identification information included in the candidate set as pieces of identification information of the transmitters provided on the current four traveling wheels.