{
  "$type": "site.standard.document",
  "description": "A control device for an internal combustion engine, equipped with: an exhaust purification catalyst (20) capable of storing oxygen; a downstream-side air-fuel ratio sensor (41) arranged downstream in the direction of flow of exhaust from the exhaust purification catalyst; and an air-fuel ratio…",
  "path": "/patents/947877",
  "publishedAt": "2015-12-09T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/0295",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "A control device for an internal combustion engine, equipped with: an exhaust purification catalyst (20) capable of storing oxygen; a downstream-side air-fuel ratio sensor (41) arranged downstream in the direction of flow of exhaust from the exhaust purification catalyst; and an air-fuel ratio control device that controls the air-fuel ratio such that air-fuel ratio of the exhaust flowing into the exhaust purification catalyst reaches a target air-fuel ratio. The control device changes the target air-fuel ratio to a lean air-fuel ratio setting when the exhaust air-fuel ratio detected by the downstream-side air-fuel ratio sensor reaches a rich air-fuel ratio, and then changes the target air-fuel ratio to a slightly lean air-fuel ratio setting before the exhaust air-fuel ratio detected by the downstream-side air-fuel ratio sensor reaches a lean air-fuel ratio, and then changes the target air-fuel ratio to a rich air-fuel ratio setting when the exhaust air-fuel ratio detected by the downstream-side air-fuel ratio sensor reaches a lean air-fuel ratio, and then changes the target air-fuel ratio to a slightly rich air-fuel ratio setting before the exhaust air-fuel ratio detected by the downstream-side air-fuel ratio sensor reaches a rich air-fuel ratio.",
  "title": "CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE"
}