{
  "$type": "site.standard.document",
  "description": "An object is to provide an exhaust purifying system for an internal combustion engine having an NSR catalyst, which can inhibit emissions from being aggravated by blow-by of NOx. An exhaust purifying system for an internal combustion engine 10 capable of a lean burn operation is provided. The…",
  "path": "/patents/1001965",
  "publishedAt": "2012-05-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9477",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "An object is to provide an exhaust purifying system for an internal combustion engine having an NSR catalyst, which can inhibit emissions from being aggravated by blow-by of NOx. An exhaust purifying system for an internal combustion engine 10 capable of a lean burn operation is provided. The exhaust purifying system includes: an NSR catalyst 16 disposed in an exhaust passage 12 of the internal combustion engine 10; an SCR 18 disposed downstream of the NSR catalyst 16; a NOx sensor 26 disposed downstream of the SCR 18, the NOx sensor 26 producing an output according to an NH 3 concentration; and rich spike means for performing a rich spike. The rich spike means starts the rich spike at a predetermined timing during a lean burn operation and terminates the rich spike at a timing when the NOx sensor 26 issues a predetermined output characteristic indicative of a rise in the NH 3 concentration.",
  "title": "EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE"
}