{
  "$type": "site.standard.document",
  "description": "An air-fuel ratio control apparatus for controlling an air-fuel ratio of a supplied air-fuel mixture of an internal combustion engine to a target air-fuel ratio by a feedback control in accordance with an output signal of an oxygen concentration sensor provided at an exhaust pipe of the internal…",
  "path": "/patents/1069685",
  "publishedAt": "2006-03-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/1401",
    "KEIHIN CORP [JP]"
  ],
  "textContent": "An air-fuel ratio control apparatus for controlling an air-fuel ratio of a supplied air-fuel mixture of an internal combustion engine to a target air-fuel ratio by a feedback control in accordance with an output signal of an oxygen concentration sensor provided at an exhaust pipe of the internal combustion engine, in which a perturbation control for vibrating the air-fuel ratio periodically to a rich side and a lean side centering on the target air-fuel ratio is executed in accordance with the output signal of the oxygen concentration sensor in a predetermined high load and high rotation operating state of the internal combustion engine.",
  "title": "AIR-FUEL RATIO CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE"
}