| 摘要 |
PURPOSE:To prevent air-fuel ratio from its disorder caused by a difference of amount detached from a canister, by controlling a release amount of fuel vapor, absorptively attached to the canister to an intake system in such a manner that the more is the fuel vapor absorptively attached to the canister the less the release amount of the fuel vapor is decreased. CONSTITUTION:An electronic control unit 13, which inputs detection values of an air flow meter 3, fuel level gage 8, supply oil detecting switch15 and an O2 sensor 16, controls a fuel supply amount while a duty ratio control solenoid valve 5 provided halfway a purge hose 10 releasing fuel vapor from a canister 6. The electronic control unit 13 calculates the basic duty ratio of the solenoid valve 5 from an intake air amount, and on the basis of an adsorbed amount immediately after a tank is filled with supply oil and an adsorbed amount during running in accordance with the time passing after the oil is supplied, the basic duty ratio is corrected such that the more the adsorbed amount is the lesser the release amount.
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