{
  "$type": "site.standard.document",
  "description": "An exhaust purification system of an internal combustion engine comprises: an adsorbent adsorbing HC and NOx in exhaust gas, a catalyst removing HC and NOx, an air-fuel ratio control part configured to control an air-fuel ratio of exhaust gas discharged from an engine body of the internal…",
  "path": "/patents/1255654",
  "publishedAt": "2020-02-27T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/0235",
    "TOYOTA JIDOSHA KABUSHIKI KAISHA"
  ],
  "textContent": "An exhaust purification system of an internal combustion engine comprises: an adsorbent adsorbing HC and NOx in exhaust gas, a catalyst removing HC and NOx, an air-fuel ratio control part configured to control an air-fuel ratio of exhaust gas discharged from an engine body of the internal combustion engine to the exhaust passage, and a temperature calculating part configured to calculate a temperature of the adsorbent. At the adsorbent, a desorption temperature of HC is higher than a desorption temperature of NOx. The air-fuel ratio control part is configured to make the air-fuel ratio a stoichiometric air-fuel ratio when a temperature of the adsorbent is in the vicinity of the desorption temperature of NOx, then make the air-fuel ratio leaner than the stoichiometric air-fuel ratio when the temperature of the adsorbent reaches the vicinity of the desorption temperature of HC.",
  "title": "EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE AND EXHAUST PURIFICATION METHOD"
}