{
  "$type": "site.standard.document",
  "description": "An engine catalyst diagnosis apparatus includes an exhaust passage for discharging exhaust gas from a combustion chamber of an engine, a catalyst device provided on the exhaust passage for purifying the exhaust gas, a linear A/F sensor that is provided on the exhaust passage downstream of the…",
  "path": "/patents/1389518",
  "publishedAt": "2026-06-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N11/002",
    "Mazda Motor Corporation"
  ],
  "textContent": "An engine catalyst diagnosis apparatus includes an exhaust passage for discharging exhaust gas from a combustion chamber of an engine, a catalyst device provided on the exhaust passage for purifying the exhaust gas, a linear A/F sensor that is provided on the exhaust passage downstream of the catalyst device and is configured to detect the air-fuel ratio of the exhaust gas, and a processing device configured to diagnose the catalyst device on the basis of the air-fuel ratio detected by the linear A/F sensor, and at start of the engine after soaking, the processing device acquires the temperature of the catalyst device, calculates a fluctuation range of the air-fuel ratio detected by the linear A/F sensor within a predetermined time, and diagnoses the catalyst device on the basis of a relationship between the fluctuation range and the catalyst temperature.",
  "title": "ENGINE CATALYST DIAGNOSIS APPARATUS"
}