| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an evaporated fuel purge control device capable of switching a drive cycle in accordance with the magnitude of a drive duty while suppressing a variation of a change ratio of the drive duty accompanied by the switching of the drive cycle. Ž<P>SOLUTION: A vaporized fuel treatment mechanism 30 includes a charcoal canister 31, a purge passage 33 for introducing vapor gas including fuel vapor released from the charcoal canister 31 to an intake passage 14 of an internal combustion engine 10, and a purge control valve 35. An electronic control device 40 switches the drive cycle in accordance with the magnitude of the drive duty of the purge control valve 35, and changes an update amount of the drive duty in correspondence with the switched drive cycle. The electronic control device 40 calculates the drive duty value when updating is performed with the update amounts in corresponding with the switchable drive cycle as a virtual duty, and determines which drive cycle can be applied among the switchable drive cycles based on the value of the virtual duty. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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