| 摘要 |
PROBLEM TO BE SOLVED: To shorten time of interruption in a purge appreciably. SOLUTION: A second-order difference integration valueΣΔΔP is computed from variationsΔP in internal pressure P detected in a purging state, and if the second-order difference integration valueΣΔΔP exceeds a first criterion valueα1, a determination concludes that an oil level fluctuation of fuel based on a running state of a vehicle is in a state causing an anomalous rise in the internal pressure P. Upon a determination finding no anomalous rise in the internal pressure P, the purge is interrupted. If the second-order difference valueΣΔΔP computed from the internal pressure P detected in this state exceeds a second criterion valueα2 set smaller than the first criterion valueα1, a detection concludes that the fuel has an anomalous oil level fluctuation, and if a variationΔP1 per determination time T1 for the internal pressure P exceeds a criterion valueβ, a detection concludes that a rise in fuel temperature based on the vehicle state is in a state causing an anomalous rise in the internal pressure P.
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