{
  "$type": "site.standard.document",
  "description": "A road surface frictional coefficient estimation device (32) includes: a first straight travel determination unit (321) configured to determine whether or not a vehicle travels straight based on a rotational speed difference between a plurality of wheels of the vehicle; a second straight travel…",
  "path": "/patents/992979",
  "publishedAt": "2013-02-06T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60K17/35",
    "JTEKT CORP [JP]"
  ],
  "textContent": "A road surface frictional coefficient estimation device (32) includes: a first straight travel determination unit (321) configured to determine whether or not a vehicle travels straight based on a rotational speed difference between a plurality of wheels of the vehicle; a second straight travel determination unit (322) configured to determine whether or not the vehicle travels straight based on a steering angle of the vehicle; a selection unit (323) configured to select one of determination results of the first straight travel determination unit (321) and the second straight travel determination unit (322); and a frictional coefficient estimation unit (324) configured to estimate a frictional coefficient of a road surface on which the vehicle travels when the one of the determination results selected by the selection unit (323) indicates that the vehicle travels straight. A driving force distribution control device (3) mounted on a vehicle including a pair of main drive wheels and a pair of auxiliary drive wheels comprises a respective road surface frictional coefficient estimation device (32). A four-wheel-drive vehicle comprises a respective driving force distribution device (3).",
  "title": "Road surface frictional coefficient estimation device, driving force distribution control device and four-wheel-drive vehicle"
}