Patent ID: 7783405

Claim:
A tire ground contact pattern specifying method for using a device to specify a ground contact pattern with respect to running road surface for a tire of a running vehicle, the device comprising: a sensor unit, disposed in a rotation mechanism section including the tire and a rotation body positioned in the vehicle body side, for securing a tire and allowing the tire to rotate, and having an acceleration sensor configured to sense at least one of a first acceleration generated in association with tire rotation in a direction orthogonal to a rotation axis and a second acceleration generated in a direction of rotation, and convert a sensed result into an electrical signal and output thereof; and a pattern information storage section configured to associate a predetermined low frequency component and a predetermined high frequency component of a ground contact pattern determination signal with tire ground contact pattern information including at least information on tire ground contact area with respect to running road surface, and preliminarily store a resultant information, the method characterized in that the device: eliminates a gravity acceleration component from at least one electrical signal of the sensed first acceleration and second acceleration to generate the ground contact pattern determination signal; separates the predetermined low frequency component and predetermined high frequency component of the ground contact pattern determination signal; and specifies a tire ground contact pattern with respect to running road surface based on the low frequency component and high frequency component obtained by the separation and the information stored in the pattern information storage section.