{
  "$type": "site.standard.document",
  "description": "A catalyst deterioration detection system comprises an air-fuel ratio sensor a current detection device a voltage application device a voltage control part an air-fuel ratio control part and a deterioration judging part The air-fuel ratio control part executes fuel cut control, and, after the fuel…",
  "path": "/patents/1236141",
  "publishedAt": "2019-06-13T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N11/007",
    "TOYOTA JIDOSHA KABUSHIKI KAISHA"
  ],
  "textContent": "A catalyst deterioration detection system comprises an air-fuel ratio sensor a current detection device a voltage application device a voltage control part an air-fuel ratio control part and a deterioration judging part The air-fuel ratio control part executes fuel cut control, and, after the fuel cut control, executes rich control. The voltage control part, if judging that the air-fuel ratio of the outflowing exhaust gas has reached the stoichiometric air-fuel ratio when setting the applied voltage to a first voltage in a limit current region during the rich control, changes the applied voltage from the first voltage to a second voltage in a limit current region. The deterioration judging part judges the degree of deterioration of the catalyst based on the output current of the air-fuel ratio sensor when the applied voltage is set to the second voltage.",
  "title": "CATALYST DETERIORATION DETECTION SYSTEM"
}