{
  "$type": "site.standard.document",
  "description": "An engine air-fuel ratio control system (12) is configured to use a rich air-fuel ratio immediately after starting an engine (1) such that the air-fuel ratio converge rapidly toward a stoichiometric value and then afterwards start an air-fuel ratio feedback control. Upon determining an air-fuel…",
  "path": "/patents/1068565",
  "publishedAt": "2006-04-05T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/061",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "An engine air-fuel ratio control system (12) is configured to use a rich air-fuel ratio immediately after starting an engine (1) such that the air-fuel ratio converge rapidly toward a stoichiometric value and then afterwards start an air-fuel ratio feedback control. Upon determining an air-fuel ratio sensor (17) is active based on the output of the air-fuel ratio sensor (17) and the amount of time elapsed since an engine was started, a stabilization fuel quantity increasing value KSTB that is a component of a target air-fuel ratio revising coefficient TFBYA is decreased at a higher rate than the rate used before the air-fuel ratio sensor (17) was determined to be active. During the same period, an air-fuel ratio feedback revising coefficient ALPHA is held at a reference value of 1. After the output of the air-fuel ratio sensor (17) reaches a value SST# corresponding to a stoichiometric air-fuel ratio, an air-fuel ratio feedback control is started.",
  "title": "Engine air-fuel ratio control system"
}