{
  "$type": "site.standard.document",
  "description": "A road surface friction coefficient estimating device includes an electronic control unit. The electronic control unit is configured to: compute a system noise variance value as an index indicating a degree of variation in a road surface friction coefficient estimation value; compute an observation…",
  "path": "/patents/1301812",
  "publishedAt": "2021-10-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01N19/02",
    "JTEKT CORPORATION"
  ],
  "textContent": "A road surface friction coefficient estimating device includes an electronic control unit. The electronic control unit is configured to: compute a system noise variance value as an index indicating a degree of variation in a road surface friction coefficient estimation value; compute an observation noise variance value as an index indicating a degree of variation in observation noise; compute, with regard to an observation deviation, an index indicating a degree of shift of the observation deviation that is newly obtained as to an index indicating a degree of past variation in the observation deviation; compute the index as a friction coefficient change amount; compute a Kalman gain; and add in the friction coefficient change amount when computing the system noise variance value.",
  "title": "ROAD SURFACE FRICTION COEFFICIENT ESTIMATING DEVICE"
}