PROBLEM TO BE SOLVED: To make it possible to further enhance an estimation accuracy of a road surface condition.SOLUTION: In a tire side device 1, a level of a high frequency component in a detection signal of a vibration power generation element 11 in a grounding section of a tire 3 is calculated and is transmitted as road surface condition data. In more detail, an integrated voltage value of the high frequency component in the detection signal of the vibration power generation element 11 in the grounding section is acquired, and the integrated voltage value is adopted as road surface condition data. Said road surface condition data is received by a vehicle side device 2, and road surface condition of a travel road surface is estimated. At this time, the integrated voltage value is corrected according to a travel state of a vehicle, and road surface condition is estimated based on the integrated voltage value after correction. Consequently, according to the travel state of the vehicle, estimation for road surface condition can be performed with a good accuracy even if a level of the high frequency component in the detection signal of the vibration power generation element 11 is fluctuated.SELECTED DRAWING: Figure 1
【課題】より路面状況の推定精度を向上させることを可能とする。【解決手段】タイヤ側装置1においてタイヤ3の接地区間中における振動発電素子11の検出信号の高周波成分のレベルを算出させ、それを路面状況データとして送信する。より詳しくは、接地区間中の振動発電素子11の検出信号における高周波成分の積分電圧値を取得し、その積分電圧値を路面状況データとする。そして、その路面状況データを車両側装置2で受信し、走行路面の路面状況を推定する。このとき、車両の走行状態に応じて積分電圧値を補正し、補正後の積分電圧値に基づいて路面状況を推定する。これにより、車両の走行状態に応じて、振動発電素子11の検出信号における高周波成分のレベルが変動しても、路面状況の推定を精度よく行うことができる。【選択図】図1
ROAD SURFACE CONDITION ESTIMATION DEVICE
路面状況推定装置
2017-08-31
Patent
Electronic Resource
Japanese
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