{
  "$type": "site.standard.document",
  "description": "An oxygen storage amount of a catalyst (3) is estimated by a controller (6) in accordance with a sensed air-fuel ratio of an inflowing exhaust gas mixture flowing into the catalyst (3), and a sensed intake air amount of the engine (1), to control the air-fuel ratio of the engine. The estimated…",
  "path": "/patents/1100670",
  "publishedAt": "2002-10-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/0295",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "An oxygen storage amount of a catalyst (3) is estimated by a controller (6) in accordance with a sensed air-fuel ratio of an inflowing exhaust gas mixture flowing into the catalyst (3), and a sensed intake air amount of the engine (1), to control the air-fuel ratio of the engine. The estimated oxygen storage amount is corrected to reduce an error in computing the estimated oxygen storage amount when a downstream exhaust condition sensed by an exhaust sensor (5) disposed on the downstream of the catalyst (3) becomes equal to a predetermined threshold, which is modified in accordance with the intake air amount for better emission control performance.",
  "title": "Apparatus and method for engine exhaust purification"
}