{
  "$type": "site.standard.document",
  "description": "Diagnosing deterioration of an SCR catalyst (5) using air-fuel ratio sensors (7, 8). A deterioration diagnosis apparatus for an exhaust gas purification apparatus performs an induction process wherein reducing agent is supplied to a hydrogen production catalyst (4), taking account of the degree of…",
  "path": "/patents/932193",
  "publishedAt": "2017-01-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N11/007",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "Diagnosing deterioration of an SCR catalyst (5) using air-fuel ratio sensors (7, 8). A deterioration diagnosis apparatus for an exhaust gas purification apparatus performs an induction process wherein reducing agent is supplied to a hydrogen production catalyst (4), taking account of the degree of deterioration of the hydrogen production catalyst, when an internal combustion engine is operating at a lean air-fuel ratio, measures the air-fuel ratio of the exhaust gas flowing into the SCR catalyst (5) and the air-fuel ratio of the exhaust gas flowing out of the SCR catalyst (5) by the air-fuel ratio sensors during the period through which the induction process is performed, and diagnoses deterioration of the SCR catalyst based on the difference between the air-fuel ratios thus measured.",
  "title": "DETERIORATION DIAGNOSIS APPARATUS FOR AN EXHAUST GAS PURIFICATION APPARATUS"
}