| 摘要 |
PROBLEM TO BE SOLVED: To provide a wheel position detection device capable of identifying wheel positions reliably while receiving a transmission frame including no angle information from a transmitter.SOLUTION: A delay time between the time when an angle of a transmitter is equal to a reference angle and the time when transmission of frames is performed is set randomly. Setting the delay time allows a transmission angle to be changed for transmission of each frame. Even when some of the frames correspond to a position of Null, the other frames avoid Null. As a result, frames that are transmitted reach a TPMS-ECU more reliably. Information on the maximum delay time and the like are stored by a TPMS-ECU3, and an allowable range of variations considering a rotation angle for the maximum delay time is set. As a result, the TPMS-ECU3 sets an allowable range of variations considering a delay time without any data on the delay time, that is, angle information within the frames. |
