| 摘要 |
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.
|
