{
  "$type": "site.standard.document",
  "description": "A method and system for controlling the operation of \"lean-burn\" internal combustion engines (12), wherein initial values for measures representing current levels of NOx and SOx stored in an emissions control device (36), such as a lean NOx trap, upon vehicle start-up are determined based at least…",
  "path": "/patents/1110087",
  "publishedAt": "2001-09-19T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N13/009",
    "FORD GLOBAL TECH INC [US]"
  ],
  "textContent": "A method and system for controlling the operation of \"lean-burn\" internal combustion engines (12), wherein initial values for measures representing current levels of NOx and SOx stored in an emissions control device (36), such as a lean NOx trap, upon vehicle start-up are determined based at least in part upon values for the measures immediately preceding engine shut-off. Such initial values obviate the need for performing a purge event immediately upon engine start-up in appropriate circumstances, such as a brief engine shut-down, whereby the fuel economy penalty associated with such an initial purge event is avoided.",
  "title": "Method and apparatus for enabling lean engine operation upon engine start-up"
}