EVAPORATIVE FUEL SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an evaporative fuel supply device including a purge valve near a canister in a purge passage and a check valve in an intake passage, capable of further suppressing a fluctuation in an air-fuel ratio during a purge control to attract evaporative fuel in a canister into an internal engine to burn the evaporative fuel even if a negative pressure remains in the purge passage between the purge valve and the check valve.SOLUTION: A check valve 32V and a purge valve 31V that can be controlled to be opened or closed by control means 40 are provided in a purge passage 36 communicating a canister 30 with an intake passage 23. The control means 40 controls the purge valve 31V into a fully closed state if a purge control execution condition is not satisfied, and controls the purge valve 31V to have a second degree of opening larger than a first degree of opening used in a purge control or to have a second duty cycle longer than a first duty cycle in a period in which a predetermined condition is satisfied if the purge control execution condition is satisfied and the purge control starts.SELECTED DRAWING: Figure 7