{
  "$type": "site.standard.document",
  "description": "The exhaust emission control apparatus is provided with a NOx catalyst (23) for purifying exhaust gas flowing out of an internal combustion engine (1) and a NOx sensor (29) for detecting a NOx concentration in exhaust gas flowing out of the NOx catalyst. The internal combustion engine (1) and the…",
  "path": "/patents/1095999",
  "publishedAt": "2003-05-14T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9431",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "The exhaust emission control apparatus is provided with a NOx catalyst (23) for purifying exhaust gas flowing out of an internal combustion engine (1) and a NOx sensor (29) for detecting a NOx concentration in exhaust gas flowing out of the NOx catalyst. The internal combustion engine (1) and the exhaust emission control apparatus are mounted on a vehicle. The exhaust emission control apparatus calculates a total outflow amount of NOx flowing out of the NOx catalyst (23) obtained while the vehicle runs for a predetermined distance based on a NOx concentration detected by the above-mentioned sensor (29), calculates a NOx outflow amount per unit running distance based on the total NOx outflow amount, and supplies the NOx catalyst (23) with exhaust gas with a rich air-fuel ratio when a NOx outflow amount per unit running distance exceeds a predetermined amount.",
  "title": "Exhaust emission control apparatus of internal combustion engine and control method of the same"
}