| 摘要 |
A misfire detection apparatus for an internal combustion engine determines misfire based on first and second variation amounts calculated based on variations of rotational speed of the internal combustion engine. A second variation amount is calculated, and it is determined whether or not a value obtained by multiplying the second variation amount by -1 is greater than a misfire determination level C1, and if the value is less than the level, process proceeds calculates a final variation amount. If the value is greater than a predetermined value, the process determines the final variation amount from the first variation amount. When the processing has been completed, the process determines whether or not the final variation amount is equal to or greater than the misfire determination level.
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