{
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  "description": "An exhaust purification system for an internal combustion engine which has a plurality of cylinders comprises an exhaust purification catalyst 20, a downstream side air-fuel ratio sensor 41, and a control device 31 which controls the average air-fuel ratio of the exhaust gas and the combustion…",
  "path": "/patents/934848",
  "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": "An exhaust purification system for an internal combustion engine which has a plurality of cylinders comprises an exhaust purification catalyst 20, a downstream side air-fuel ratio sensor 41, and a control device 31 which controls the average air-fuel ratio of the exhaust gas and the combustion air-fuel ratios of the cylinders. The control device 31 performs average air-fuel ratio control where it controls the average air-fuel ratio alternately between the rich air-fuel ratio and the lean air-fuel ratio and inter-cylinder air-fuel ratio control where it controls the combustion air-fuel ratios of the cylinders so that the combustion air-fuel ratio becomes the rich air-fuel ratio at least at one cylinder among the plurality of cylinders even when the average air-fuel ratio is controlled to the lean air-fuel ratio by average air-fuel ratio control. In average air-fuel ratio control, the average air-fuel ratio is controlled so that the lean shift amount when controlling the average air-fuel ratio to the lean air-fuel ratio becomes smaller than the rich shift amount when controlling the average air-fuel ratio to the rich air-fuel ratio.",
  "title": "EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE"
}