| 摘要 |
PROBLEM TO BE SOLVED: To detect breakdown of purge control valves while keeping the present flow rate of evaporation fuel at a constant rate, in an evaporation fuel control device with a plurality of purge control valves. SOLUTION: This evaporation fuel control device with a plurality of purge control valves is provided with an evaporation fuel flow rate control means S104 changing openings of the respective purge control valves into openings respectively different from the present conditions while having the flow rate of the evaporation fuel requested according to an operation condition kept constantly. Moreover, it is provided with breakdown detecting means (S101-S103, S105-S106) calculating an air-fuel ratio before and after the changeover of the purge control valves by the flow rate control means and determining whether there is breakdown in the purge control valves or not by the deviation. These breakdown control means include a broken purge control valve determining means S106 determining the broken purge control valves by a direction of a change in the air-fuel ratio before and after the changeover and the opening of the respective purge control valves after the changeover. COPYRIGHT: (C)2009,JPO&INPIT
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