{
  "$type": "site.standard.document",
  "description": "Process for operating a direct injection I.C. engine containing a catalyst system with a nitrogen oxides storage catalyst comprises storing nitrogen oxides in the storage catalyst under a first operating condition, and releasing the nitrogen oxides from the catalyst under a second operating…",
  "path": "/patents/1088404",
  "publishedAt": "2004-03-31T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N3/0814",
    "VOLKSWAGEN AG [DE]"
  ],
  "textContent": "Process for operating a direct injection I.C. engine containing a catalyst system with a nitrogen oxides storage catalyst comprises storing nitrogen oxides in the storage catalyst under a first operating condition, and releasing the nitrogen oxides from the catalyst under a second operating condition. A predetermined maximum time duration is assigned to each point in a load rotational speed mapping for each first operating condition which then switches to a second operating condition assigned to this point. The first operating condition comprises a lean operation, especially a shift operation and/or homogeneous lean operation. The lambda value for an air-fuel ratio in the first operating condition is more than 1.1. The second operating condition comprises a stoichiometric operation with a lambda value for an air-fuel ratio equal to 1. The predetermined maximum time duration is 0-20 seconds, preferably 0-5 seconds.",
  "title": "Method for operating a direct injection engine"
}