{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
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  "description": "An exhaust gas cleaning system for an internal combustion engine is provided with, in an exhaust passage (15) of an internal combustion engine (10) and in order from an upstream side: a hydrocarbon supply unit (32); an upstream side catalyst unit (31 a) of an oxidation catalyst, a NOx reduction…",
  "path": "/patents/927552",
  "publishedAt": "2017-04-26T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N13/009",
    "ISUZU MOTORS LTD [JP]"
  ],
  "textContent": "An exhaust gas cleaning system for an internal combustion engine is provided with, in an exhaust passage (15) of an internal combustion engine (10) and in order from an upstream side: a hydrocarbon supply unit (32); an upstream side catalyst unit (31 a) of an oxidation catalyst, a NOx reduction catalyst, or the like; and a catalyst-equipped fine particle collection filter (31b) having a hydrocarbon adsorption function, wherein when a vehicle on which the engine (10) is mounted accelerates after driving for a preset set time period (ta) at a temperature (Tg1) of exhaust gas (G) equal to or less than a preset set exhaust gas temperature (TO), the supply of hydrocarbon into the exhaust gas (G) is started when an exhaust gas temperature (Tg) becomes equal to or more than a preset first set temperature (T1), and the supply of hydrocarbon is terminated when a preset termination condition is satisfied. As a result, when the vehicle is accelerated from steady driving in a low-speed, low-load operation state in which the temperature (Tg1) of the exhaust gas (G) is low, and a NOx generation amount is temporarily increased, the amount of NOx emitted from the internal combustion engine (10) is reduced.",
  "title": "EXHAUST GAS CLEANING SYSTEM FOR INTERNAL COMBUSTION ENGINE AND EXHAUST GAS CLEANING METHOD FOR INTERNAL COMBUSTION ENGINE"
}