| 摘要 |
PROBLEM TO BE SOLVED: To provide a detection device capable of cancelling the influence of live load on a vehicle and accurately detecting a reduced pressure state of a tire.SOLUTION: There is provided a detection device for detecting a reduced pressure state of a tire attached to a vehicle. The detection device includes: an index value calculation part; a resonance frequency calculation part; and a decompression detection part. The index value calculation part calculates a reduced pressure index value which is a comparison value between the rotation speed of a front wheel and the rotation speed of a rear wheel from wheel speed information of a front wheel tire and a rear wheel tire. The resonance frequency calculation part calculates a resonance frequency of the tire from the wheel speed information of at least one tire. A reduced pressure detection part detects a reduced pressure state while cancelling the influence of live load to the vehicle based on the predetermined parameter showing a linear relation between the resonance frequency and the reduced pressure index value under the reduced pressure condition of the predetermined tire, the reduced pressure index value calculated by the index value calculation part, and the resonance frequency calculated by the resonance frequency calculation part.SELECTED DRAWING: Figure 6 |
