Patent ID: 9434387
Filing Date: 2016-09-06
CPC Classification: B60C,B60W

Claim Text:
1. A method for determining a condition of a road surface with which a tire is in contact by detecting tire vibration during vehicular travel, the method comprising: detecting the tire vibration during vehicular travel; deriving a time-series waveform of the detected tire vibration; windowing the time-series waveform of the tire vibration at a predetermined time width and extracting time-series waveforms for respective time windows; calculating respective feature vectors from the time-series waveforms of the respective time windows; calculating kernel functions from the feature vectors for the respective time windows and road surface feature vectors, which are the feature vectors for the respective time windows calculated from the time-series waveforms of tire vibration obtained for each of road surface conditions calculated in advance; and determining the road surface condition based on values of discriminant functions using the kernel functions, wherein in the determining, the road surface condition is determined by comparing the values of the discriminant functions obtained for the respective road surface conditions.