Hydrocarbons emission preventive apparatus in intake system for internal combustion engine and method thereof
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United States of America Patent
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Sep 7, 2004
Grant Date -
Feb 6, 2003
app pub date -
Jul 26, 2002
filing date -
Aug 1, 2001
priority date (Note) -
Expired
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Abstract
A throttle valve is opened after stopping an engine to prevent the valve from sticking. Then, when a temperature of the valve has become lower than the polymerization temperature, the valve is closed to seal the vapor of the HCs in a surge tank downstream. Changes in the temperature of the valve are, for example, estimated based on a temperature of an intake air detected by an intake temperature sensor.
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