Control apparatus for internal combustion engine
AssigneeMitsubishi Electric Corporation
InventorsOsamu Maeda, Hideki Takubo
Life of this patent
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Abstract
The control apparatus for the internal combustion engine includes: a unit for detecting the change in the alcohol concentration of a fuel supplied to the internal combustion engine including a plurality of cylinders; a unit for detecting an air-fuel ratio variation between the plurality of cylinders; a unit for making the failure diagnosis when the air-fuel ratio variation between the plurality of cylinders exceeds a predetermined threshold value; and a unit for inhibiting the failure diagnosis executed based on the air-fuel ratio variation between the plurality of cylinders when the change in the alcohol concentration is detected.
Claims2
A control apparatus for an internal combustion engine, comprising:
- means for detecting a change in an alcohol concentration of a fuel supplied to the internal combustion engine including a plurality of cylinders;
- means for detecting an air-fuel ratio variation between the plurality of cylinders;
- means for making a failure diagnosis when the air-fuel ratio variation between the plurality of cylinders exceeds a predetermined threshold value;
- and
- means for inhibiting the failure diagnosis executed based on the air-fuel ratio variation between the plurality of cylinders when the change in the alcohol concentration is detected and the increase of the air-fuel ratio variation is detected by the means for detecting an air-fuel ratio variation.
Dependencies are inferred from the claim text.