| 摘要 |
In an evaporated fuel treatment system, a pump is operated to flow air through a specified restriction and a sensor detects a first differential pressure across the restriction. A fuel tank, a canister, and the restriction are made to communicate with each other and an air-fuel mixture containing the evaporated fuel is purged from the canister. The mixture flows through the restriction and a second differential pressure across the restriction is detected. A differential pressure ratio and an evaporated fuel concentration used for the control of a flow rate are computed from these differential pressures. When fuel swings in a period during which the second differential pressure is detected, the pressure difference ratio is not computed and the flowrate control of the air-fuel mixture is not conducted.
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