{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "This invention relates to a control device (72) for an internal combustion engine (10). An object of this invention is to prevent a deterioration in exhaust characteristics when a change to an air-fuel ratio on a theoretical air-fuel ratio side is requested in an internal combustion engine (10)…",
  "path": "/patents/927517",
  "publishedAt": "2017-04-26T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N11/007",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "This invention relates to a control device (72) for an internal combustion engine (10). An object of this invention is to prevent a deterioration in exhaust characteristics when a change to an air-fuel ratio on a theoretical air-fuel ratio side is requested in an internal combustion engine (10) during operation in a lean mode. The control device (72) controls an internal combustion engine equipped with a NOx storage-reduction catalyst in an exhaust passage. When a NOx amount stored in the NOx storage-reduction catalyst reaches a release threshold value (76 or 84), the control device executes rich control to cause the NOx to be released. In a state in which an air-fuel ratio of an air-fuel mixture belongs to a second region that is near a lean limit, the release threshold value (76) for determining the start of the rich control is set in the vicinity of the NOx storage capacity of the NOx storage-reduction catalyst. If the air-fuel ratio of the air-fuel mixture enters a first region that is near a theoretical air-fuel ratio, the control device changes the release threshold value (84) to a smaller value.",
  "title": "CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE"
}