{
  "$type": "site.standard.document",
  "description": "A CPU performs a regeneration process for a GPF by stopping combustion control of cylinder #1 and causing an air-fuel ratio of an air-fuel mixture in the other cylinders to be richer. The CPU calculates a rotational fluctuation amount which is used to detect random misfires in which a misfire rate…",
  "path": "/patents/1323974",
  "publishedAt": "2022-08-04T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/1498",
    "TOYOTA JIDOSHA KABUSHIKI KAISHA"
  ],
  "textContent": "A CPU performs a regeneration process for a GPF by stopping combustion control of cylinder #1 and causing an air-fuel ratio of an air-fuel mixture in the other cylinders to be richer. The CPU calculates a rotational fluctuation amount which is used to detect random misfires in which a misfire rate in a predetermined period is equal to or greater than a predetermined proportion by calculating a difference in time et3txdh in which a crank shaft rotates by 30°CA. At the time of performing the regeneration process, the CPU calculates the rotational fluctuation amount based on a value obtained by removing an influence of torsion of a damper from the time et3txdh. When the influence of torsion is removed, 0.5th-order rotation and harmonics thereof are selectively used using a filter process.",
  "title": "MISFIRE DETECTION DEVICE FOR INTERNAL COMBUSTION ENGINE"
}