{
  "$type": "site.standard.document",
  "description": "An exhaust purification system of an internal combustion engine is provided with an exhaust purification catalyst where NO x which is contained in exhaust gas and modified hydrocarbons react. The exhaust purification catalyst carries precious metal catalysts and is formed with a basic exhaust gas…",
  "path": "/patents/985130",
  "publishedAt": "2013-04-17T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/94",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "An exhaust purification system of an internal combustion engine is provided with an exhaust purification catalyst where NO x which is contained in exhaust gas and modified hydrocarbons react. The exhaust purification catalyst carries precious metal catalysts and is formed with a basic exhaust gas flow surface part. The exhaust purification catalyst has the property of reducing NO x if making the concentration of hydrocarbons which flow into the exhaust purification catalyst vibrate by within a predetermined range of amplitude and within a predetermined range of period. The system estimates the holding ability by which the NO x in the exhaust gas is held on the basic exhaust gas flow surface part of the exhaust purification catalyst and, when the holding ability becomes less than a predetermined judgment value of the holding ability, makes the concentration of hydrocarbons which flow into the exhaust purification catalyst rise.",
  "title": "EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE"
}