Method and apparatus for discriminating operativeness/inoperativeness of an air-fuel ratio sensor
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United States of America Patent
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Jul 7, 1987
Grant Date -
N/A
app pub date -
Oct 30, 1985
filing date -
Nov 30, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an air-fuel ratio feedback control system for an engine having an air-fuel ratio sensor, operativeness/inoperativeness of the air-fuel ratio sensor is discriminated. An output signal of the air-fuel ratio sensor is compared and a difference thereof from a reference level is integrated for a predetermined internal of time. Integration value is compared with a discrimination reference so that a feedback control is disabled when the integration value does not attain the discrimination reference indicating inoperativeness of the air-fuel ratio sensor.
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