{
  "$type": "site.standard.document",
  "description": "A levelling ECU includes a receiver which receives an acceleration from which a tilt angle of a vehicle with respect to a horizontal plane is derivable, and a controller which controls adjustment of an optical axis of a vehicle lamp. A sum angle includes a first angle and a second angle, wherein…",
  "path": "/patents/995598",
  "publishedAt": "2012-11-28T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60Q1/10",
    "KOITO MFG CO LTD [JP]"
  ],
  "textContent": "A levelling ECU includes a receiver which receives an acceleration from which a tilt angle of a vehicle with respect to a horizontal plane is derivable, and a controller which controls adjustment of an optical axis of a vehicle lamp. A sum angle includes a first angle and a second angle, wherein the sum angle is the tilt angle of the vehicle with respect to the horizontal plane, the first angle is a tilt angle of a road surface with respect to the horizontal plane, and a second angle is a tilt angle of the vehicle with respect to the road surface. The controller stores the reference value of the first angle and a reference value of the second angle, wherein the controller updates the reference value of the second angle by treating change of the sum angle during vehicle stop as change of the second angle. The controller outputs a control signal instructing adjustment of the optical axis according to the updated reference value of the second angle. The controller updates the reference value of the first angle by treating, as change of the first angle, change of the sum angle during vehicle traveling. The controller derives a difference between a value of the sum angle and a sum of the reference value of the first angle and the reference value of the second angle, and corrects at least one of the reference value of the first angle and the reference value of the second angle so as to reduce the difference.",
  "title": "Vehicle lamp control apparatus and vehicle lamp system"
}