FUEL EVAPORATIVE EMISSION CONTROL DEVICE
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United States of America Patent
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app pub date -
Dec 21, 2012
filing date -
Jan 5, 2012
priority date (Note) -
Abandoned
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Abstract
When fuel tank internal pressure is continuously at a first predetermined pressure P1 over a first predetermined time length a fuel tank shutoff valve is opened and a vapor solenoid valve is closed to make piping internal pressure equal to the fuel tank internal pressure. Then a purge control valve is opened to emit fuel evaporative gas from the fuel tank into an intake passage. Then, when the fuel tank internal pressure is continuously at a second predetermined pressure P2 or below over the first predetermined time length the fuel tank shutoff valve is closed. When accumulated volume in high-pressure purge finishing phase reaches a second predetermined volume iv2 or above, the vapor solenoid valve is opened, and when the accumulated volume in high-pressure purge finishing phase reaches a first predetermined volume iv1 or above, the purge control valve is opened and the engine is stopped.
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