| 摘要 |
PROBLEM TO BE SOLVED: To estimate a road surface state without frequency analysis, thereby reduce power consumption and reduce a number of components for frequency analysis.SOLUTION: A tire side device 1 calculates a level of a high frequency component of a detection signal of a vibration power generation element 11 in a grounding zone of a tire 3, and transmits the level as road surface state data. Then, a vehicle side device 2 receives the road surface state data and estimates a road surface state of a travel road surface. Therefore, without frequency analysis, it is possible to estimate the road surface state, therefore power consumption can be reduced and a number of components for frequency analysis can be reduced. |
