{
  "$type": "site.standard.document",
  "description": "An exhaust purification system of an internal combustion engine comprises an HC adsorbent arranged adsorbing HC in exhaust gas, an NOx adsorbent adsorbing NOx in exhaust gas, a catalyst removing HC and NOx at a predetermined air-fuel ratio, an air-fuel ratio control part configured to control an…",
  "path": "/patents/1255653",
  "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 HC adsorbent arranged adsorbing HC in exhaust gas, an NOx adsorbent adsorbing NOx in exhaust gas, a catalyst removing HC and NOx at a predetermined air-fuel ratio, an air-fuel ratio control part configured to control an air-fuel ratio of exhaust gas, and an HC concentration calculating part configured to calculate a concentration of HC desorbed from the HC adsorbent. A peak of a desorption temperature of HC at the HC adsorbent and a peak of a desorption temperature of NOx at the NOx adsorbent are substantially the same. The air-fuel ratio control part is configured to control an air-fuel ratio of inflowing exhaust gas flowing into the catalyst to the predetermined air-fuel ratio based on the concentration of HC calculated by the HC concentration calculating part when HC is desorbed from the HC adsorbent.",
  "title": "EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE AND EXHAUST PURIFICATION METHOD"
}