{
  "$type": "site.standard.document",
  "description": "A driver state estimation apparatus includes a controller to estimate the driver's state based on travel environment and the driver's line of sight. The controller calculates a predicted gazing frequency of the driver to gaze at a cautionary object based on a relative risk, an observable time, and…",
  "path": "/patents/1374310",
  "publishedAt": "2026-06-02T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60W40/09",
    "MAZDA MOTOR CORPORATION"
  ],
  "textContent": "A driver state estimation apparatus includes a controller to estimate the driver's state based on travel environment and the driver's line of sight. The controller calculates a predicted gazing frequency of the driver to gaze at a cautionary object based on a relative risk, an observable time, and a speed of the vehicle, calculates a predicted gazing time in which the driver continuously gazes at the cautionary object, acquires a measured value of each of a gazing frequency and a gazing time, calculates an abnormality level of the driver based on a product of a difference between the actual measured value and the predicted value of the gazing frequency and a difference between the actual measured value and the predicted value of the gazing time, and estimates that the driver is in an inattentive state when the abnormality level is equal to or greater than a predetermined threshold.",
  "title": "Driver state estimation apparatus"
}