Abnormality detection device for air-fuel ratio sensor
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKazutaka Hattori
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Abstract
A novel abnormality detection device for an air-fuel ratio sensor able to more accurately detect an abnormality, provided with an air-fuel ratio sensor arranged in an exhaust passage of an internal combustion engine for detecting an air-fuel ratio based on a current generated in accordance with a concentration of oxygen in the exhaust gas along with application of voltage and an air-fuel ratio sensor activating means for activating the air-fuel ratio sensor, wherein the activity of the air-fuel ratio sensor is maintained even after the internal combustion engine is stopped and an abnormality of the air-fuel ratio sensor is detected based on an output of the air-fuel ratio sensor upon and/or after the elapse of a first predetermined time after the internal combustion engine is stopped.
Claims9
An abnormality detection device for an air-fuel ratio sensor provided with:
- an air-fuel ratio sensor arranged in an exhaust passage of an internal combustion engine for detecting an air-fuel ratio based on a current generated in accordance with a concentration of oxygen in the exhaust gas along with application of voltage and
- an air-fuel ratio sensor activating means for activating said air-fuel ratio sensor, wherein
- the activity of said air-fuel ratio sensor is maintained even after the internal combustion engine is stopped and an abnormality of the air-fuel ratio sensor is detected based on an output of said air-fuel ratio sensor upon and/or after the elapse of a first predetermined time after the internal combustion engine is stopped.
An abnormality detection device for an air-fuel ratio sensor provided with:
- an air-fuel ratio sensor arranged in an exhaust passage of an internal combustion engine for detecting an air-fuel ratio based on a current generated in accordance with a concentration of oxygen in the exhaust gas along with application of voltage and
- an air-fuel ratio sensor activating means for activating said air-fuel ratio sensor, wherein
- the activity of said air-fuel ratio sensor is maintained even after the internal combustion engine is stopped and an abnormality of the air-fuel ratio sensor is detected based on a speed of change of output of said air-fuel ratio sensor after the elapse of a first predetermined time after the internal combustion engine is stopped.
Dependencies are inferred from the claim text.