{
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  "description": "The internal combustion engine comprises an exhaust purification catalyst 20 able to store oxygen, and a downstream side air-fuel ratio sensor 41 arranged at a downstream side of the exhaust purification catalyst in a direction of exhaust flow. The control system performs feedback control of an…",
  "path": "/patents/934879",
  "publishedAt": "2016-11-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N11/007",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "The internal combustion engine comprises an exhaust purification catalyst 20 able to store oxygen, and a downstream side air-fuel ratio sensor 41 arranged at a downstream side of the exhaust purification catalyst in a direction of exhaust flow. The control system performs feedback control of an amount of fuel fed to a combustion chamber of the internal combustion engine so that an air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst becomes a target air-fuel ratio and performs learning control to correct a parameter relating to the feedback control based on an air-fuel ratio of exhaust gas detected by the downstream side air-fuel ratio sensor. The target air-fuel ratio is alternately switched between a rich set air-fuel ratio and a lean set air-fuel ratio leaner. When a condition for learning acceleration, which is satisfied when it is necessary to accelerate correction of the parameter by the learning control, is satisfied, a rich degree of the rich set air-fuel ratio is increased. Therefore, there is provided an internal combustion engine able to suitably change the speed of updating the learning value.",
  "title": "INTERNAL COMBUSTION ENGINE CONTROLLER"
}