Patent ID: 7969292
Filing Date: 2011-06-28
Classification: B60C

Abstract:
1. A tire air pressure measuring apparatus comprising: a tire air pressure measuring unit which rotates together with tires of a vehicle and sends an air pressure data signal on an air pressure of the tires at predetermined transmitting intervals; a receiver unit for receiving the air pressure data signal; a vehicle-stop judgment unit which generates a received signal strength data on a received signal strength of the air pressure data signal and which determines that the vehicle stops only when a predetermined vehicle-stop condition is met based on the received signal strength data; and a warning unit which provides a warning of an error of the tire air pressure measuring unit only when it is not determined that the vehicle stops and also the receiver unit has not received the air pressure data signal for an error determining duration which is longer than the transmitting interval, wherein the tire air pressure measuring unit and the receiver unit transmit the signals wirelessly, wherein the tire air pressure measuring unit is provided for each of the tires and sends an identification data signal for differentiating itself from other air pressure measuring units together with the air pressure data signal, wherein the receiver unit receives the identification data signal, wherein the vehicle-stop judgment unit classifies the air pressure data signal received by the receiver unit into each of segments provided for the tires based on the identification data signal received by the receiver unit, and generates the received signal strength data on the received signal strength of the air pressure data signal for each of the segments, and wherein the vehicle-stop condition is a condition in which the received signal strength data stay constant continuously for the error determining duration in respect to any one of the segments.