Patent ID: 7881836
Filing Date: 2011-02-01
Classification: B60C

Abstract:
1. A tire state monitoring apparatus comprising: a transponder mounted on a tire on a vehicle; and a controller provided on a vehicle body to repeatedly transmit an address electric wave that acquires data showing a tire state to the transponder, wherein the controller transmits the address electric wave at a predetermined transmission cycle to the transponder, estimates the transmission timing of the address electric wave at the predetermined transmission cycle according to a vehicle speed, maintains the predetermined transmission cycle if the estimated transmission timing satisfies a predetermined condition, and adjusts the predetermined transmission cycle if the transmission timing does not satisfy the predetermined condition wherein the transmission timing is calculated on the basis of a starting point of a transmission cycle, and the predetermined condition is such that target transmission timing that is transmission timing directly before or directly after one rotation of the tire in the calculated transmission timing is located within a prescribed reference angle range.