| 摘要 |
PROBLEM TO BE SOLVED: To more surely receive a transmission frame from a transmitter, and to more surely specify wheel positions.SOLUTION: A delay time from a reference angle is set in accordance with a transmission frequency, and each time the transmission frequency is increased, the delay time is shifted by a fixed period of time. When the angle of a transmitter reaches a reference angle, and the delay time elapses, frame transmission is performed. Thus, it is possible to change a transmission angle at which the frame transmission is performed in accordance with the transmission frequency, and to more surely perform frame reception. On the basis of a lapsed time since the previous frame reception to this time frame reception and the transmission cycle of the frame, it is possible to estimate the transmission frequency since the previous frame reception to this time frame reception. Thus, it is possible to calculate tooth positions in the case of accurately performing the frame transmission at a fixed angle as a reference even when any information on the delay time or the transmission frequency is not included in the frame. |
