{
  "$type": "site.standard.document",
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  "description": "A controller comprises an impedance detection unit for applying an impedance detection voltage to the sensor and detect device impedance; and reverse voltage application unit for applying the same voltage as generated by the sensor itself or a voltage that shifts same voltage against a direction of…",
  "path": "/patents/1082851",
  "publishedAt": "2004-10-27T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02D41/1454",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "A controller comprises an impedance detection unit for applying an impedance detection voltage to the sensor and detect device impedance; and reverse voltage application unit for applying the same voltage as generated by the sensor itself or a voltage that shifts same voltage against a direction of impedance detection voltage for specified period of time. The controller also has data invalidation unit for invalidating the output of the sensor for a specified period of time after detection voltage is applied; and an impedance detection time interval setup unit for increasing specified time intervals with an increase in device impedance.",
  "title": "Controller for gas concentration sensor"
}