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Tire air pressure monitoring system

  • US 7,948,365 B2
  • Filed: 03/05/2009
  • Issued: 05/24/2011
  • Est. Priority Date: 03/07/2008
  • Status: Expired due to Fees
First Claim
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1. A tire air pressure monitoring system for a vehicle comprising:

  • a plurality of transmitters provided near tires of a vehicle, each of the transmitters including a tire air pressure sensor for detecting an air pressure of the tire, the transmitter transmitting as a radio wave a transmission signal indicating the air pressure detected by the tire air pressure sensor;

    a receiver for receiving the transmission signal from each transmitter so that a tire air pressure of each tire is monitored based on the transmission signal received by the receiver;

    the receiver including an antenna element, a variable impedance element coupled to the antenna element, and a power supply source for supplying the antenna element with electric power; and

    a directivity control section configured to control directivity of the receiver by controlling a voltage supplied to the variable impedance element.

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