{
  "$type": "site.standard.document",
  "description": "To effectively reduce the ammonia generation amount of a catalyst device in an engine exhaust gas purification apparatus, the apparatus includes a catalyst device that contains precious metals including palladium and rhodium and purifies exhaust gas, a linear air-fuel (A/F) sensor provided on an…",
  "path": "/patents/1389525",
  "publishedAt": "2026-06-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/0235",
    "Mazda Motor Corporation"
  ],
  "textContent": "To effectively reduce the ammonia generation amount of a catalyst device in an engine exhaust gas purification apparatus, the apparatus includes a catalyst device that contains precious metals including palladium and rhodium and purifies exhaust gas, a linear air-fuel (A/F) sensor provided on an exhaust passage downstream of the catalyst device, and a control device that controls a fuel injection valve so as to set the air-fuel ratio of the exhaust gas to a target air-fuel ratio on the basis of the air-fuel ratio detected by the sensor. The control device determines whether the catalyst device is active and determines whether the catalyst device is deteriorated, and sets the target air-fuel ratio to a first air-fuel ratio to be leaner when determining that the catalyst device is not active and is deteriorated than when determining that the catalyst device is not deteriorated.",
  "title": "ENGINE EXHAUST GAS PURIFICATION APPARATUS"
}