WHEEL SPEED ROTATION FLUCTUATION PATTERN EXTRACTION DEVICE AND REFERENCE PATTERN SETTING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a wheel speed rotation fluctuation pattern extraction device capable of simultaneously correcting components due to a rotation sensor and a driving system and capable of extracting a rotation speed fluctuation pattern due to a tread pattern of a tire having a high S/N ratio.SOLUTION: A wheel speed rotation fluctuation pattern extraction device includes: a rotation sensor 2 for detecting a rotation speed of a wheel 1; and a signal processing unit 3. The signal processing unit 3 includes: rotation fluctuation pattern extraction means 7 for extracting a rotation speed fluctuation pattern synchronized with a rotation from a rotation signal detected by the rotation sensor 2; a reference pattern storage memory 9; and error correction processing means 6 for correcting the rotation signal outputted from the rotation sensor 2 and inputted to the rotation fluctuation pattern extraction means 7 by a reference pattern. The reference pattern is based on the rotation speed fluctuation pattern obtained by the rotation sensor 2 using a reference tire which is a tire 1a having no feature by a rotation position across the entire circumference.SELECTED DRAWING: Figure 1