{
  "$type": "site.standard.document",
  "description": "An apparatus for assessing the condition of a road surface comprising rotational speed detecting means for periodically detecting rotational speeds of four tyres of a vehicle; first computing means for computing slip ratio from measurement values of the rotational speed detecting means; second…",
  "path": "/patents/1110271",
  "publishedAt": "2001-09-12T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60T8/172",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "An apparatus for assessing the condition of a road surface comprising rotational speed detecting means for periodically detecting rotational speeds of four tyres of a vehicle; first computing means for computing slip ratio from measurement values of the rotational speed detecting means; second computing means for obtaining a relational formula between the slip ratio and acceleration/deceleration of the vehicle; and friction coefficient judging means for judging a coefficient of friction occurring between a road and a tyre on the basis of a slope of the relational formula obtained by the second computing means. The road friction coefficient mu can be judged with high accuracy in a short time by using only the wheel rotational speed information of four wheels. Thus, the performance and safety of a vehicle can be increased.",
  "title": "Apparatus and method for assessing condition of road surface"
}