{
  "$type": "site.standard.document",
  "description": "An exhaust purification system of an internal combustion engine is provided with an exhaust purification catalyst which includes an upstream side catalyst and a downstream side catalyst and which makes NOand hydrocarbons react. The upstream side catalyst has an oxidation ability, while the…",
  "path": "/patents/987470",
  "publishedAt": "2013-08-14T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9409",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "An exhaust purification system of an internal combustion engine is provided with an exhaust purification catalyst which includes an upstream side catalyst and a downstream side catalyst and which makes NOand hydrocarbons react. The upstream side catalyst has an oxidation ability, while the downstream side catalyst carries precious metal catalyst particles on an exhaust flow surface and is formed with basic exhaust flow surface parts. The exhaust purification catalyst makes the concentration of hydrocarbons vibrate by within a predetermined range of amplitude and by within a predetermined range of period so as to remove the NO. The upstream side catalyst has a high efficiency temperature at which hydrocarbons can be partially oxidized by a predetermined efficiency. The exhaust purification system controls the temperature of the upstream side catalyst so that the upstream side catalyst becomes less than the high efficiency temperature in the time period of feeding hydrocarbons and the upstream side catalyst becomes a high efficiency temperature or more after feeding the hydrocarbons.",
  "title": "EXHAUST PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE"
}