| 摘要 |
PROBLEM TO BE SOLVED: To prevent lowering of leak diagnostic accuracy due to refueling, while maintaining performance frequency of leak diagnoses during engine stop and fulfilling demand of battery electric power consumption reduction. SOLUTION: The leak diagnostic device determines whether a fuel tank 11 has been refueled or not based on the change in the remaining fuel amount detected by a fuel level sensor 27 after each engine stop. When it is determined that the tank is refueled, a leak diagnosis after engine stop is inhibited. Lowering of leak diagnosis accuracy due to refueling is thereby prevented, and when it is determined that the tank has been refueled, supplying of electric power to each part necessary for a leak diagnosis is cut off, so that electric power consumption during engine stop can be reduced. Because it is unnecessary to lengthen the waiting period of a leak diagnosis, the increase of the number of times of engine restart can be prevented before start of leak diagnosis, and the performance frequency of leak diagnoses during engine stop can be maintained. COPYRIGHT: (C)2005,JPO&NCIPI
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