{
  "$type": "site.standard.document",
  "description": "The control device executes transition control when the operating state of the air flow control valve is switched during implementation of the lean burn operation, and the NOx storage amount which is estimated is smaller than a determination value (S4, S8, S10). According to the transition control…",
  "path": "/patents/932196",
  "publishedAt": "2017-01-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N3/0814",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "The control device executes transition control when the operating state of the air flow control valve is switched during implementation of the lean burn operation, and the NOx storage amount which is estimated is smaller than a determination value (S4, S8, S10). According to the transition control, a combustion air-fuel ratio in a cycle of which an intake stroke overlaps a time period of switching the operating state of the air flow control valve is made leaner than the theoretical air-fuel ratio and richer than the predetermined air-fuel ratio. When the estimated value of the NOx storage amount is the determination value or more (S8), rich spike is executed during a predetermined time period including the time period of switching the operating state of the air flow control valve (S12).",
  "title": "COMBUSTION MODE TRANSITION CONTROL DEVICE FOR AN INTERNAL COMBUSTION ENGINE HAVING A NOX STORAGE REDUCTION CATALYST"
}