{
  "$type": "site.standard.document",
  "description": "The condition of a road surface on which a vehicle is traveling is estimated accurately, using a tire having a general variable-pitch tire pattern for detection of a road surface condition. The tire for detection of a road surface condition has rows of blocks, the total number N of the…",
  "path": "/patents/995879",
  "publishedAt": "2012-11-21T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C11/1369",
    "BRIDGESTONE CORP [JP]"
  ],
  "textContent": "The condition of a road surface on which a vehicle is traveling is estimated accurately, using a tire having a general variable-pitch tire pattern for detection of a road surface condition. The tire for detection of a road surface condition has rows of blocks, the total number N of the circumferentially disposed blocks being 10 or more and the number n of lug grooves, each provided with at joining section connecting circumferentially adjacent blocks, being in the range of (N/2) ‰¤ n ‰¤ (N-5). The vibrations of the tire are detected by an acceleration sensor and are subjected to a rotational order ratio analysis by a rotational order ratio analyzing unit. And the road surface condition is estimated by comparing the amplitude P of the rotational order component of the tire vibrations extracted by a rotational order component extracting unit with a predetermined threshold value K.",
  "title": "Road surface condition estimating method, vehicle control method, and road surface condition estimating apparatus"
}