{
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  "description": "An engine control system comprises nitrogen oxide catalyst (11) in the exhaust pipe (10) of engine (9) to trap nitrogen oxide by absorption or storage, nitrogen oxide sensor (28), nitrogen oxide trap catalyst model for estimating nitrogen oxide amount trapped in the catalyst and a device that…",
  "path": "/patents/1082807",
  "publishedAt": "2004-10-27T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/0275",
    "HITACHI LTD [JP]"
  ],
  "textContent": "An engine control system comprises nitrogen oxide catalyst (11) in the exhaust pipe (10) of engine (9) to trap nitrogen oxide by absorption or storage, nitrogen oxide sensor (28), nitrogen oxide trap catalyst model for estimating nitrogen oxide amount trapped in the catalyst and a device that controls the operating condition of the engine based on output of the nitrogen catalyst model and the nitrogen oxide sensor.",
  "title": "Engine control system"
}