Evaporated fuel treatment apparatus for internal combustion engine
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United States of America Patent
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Aug 20, 2013
Grant Date -
Jun 23, 2011
app pub date -
Nov 12, 2010
filing date -
Dec 23, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
An evaporated fuel treatment apparatus collects vapor, generated in a fuel tank, in a canister. A bypass passage is provided for an intake passage. An ejector is placed in the bypass passage to generate a negative pressure by air flowing in the bypass passage. When the negative pressure occurs in the ejector, the vapor collected in the canister is drawn from the canister to the ejector through the purge passage and then purged from the bypass passage to the intake passage. An open/close valve placed in the ejector is configured to allow or block the flow of air from the intake passage to the bypass passage according to a pressure difference between the pressure in an upstream portion and the pressure in a downstream portion of the bypass passage during engine operation.
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