Evaporation fuel processing unit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 2, 2004
Grant Date -
Jul 24, 2003
app pub date -
Jan 14, 2003
filing date -
Jan 22, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shut off valve is provided in an intake line farther upstream than a throttle valve of the intake passage and farther downstream than an air cleaner. This shut off valve is opened by a signal or the like from an ECU when an engine is operating. Further, the shut off valve closes when the engine is stopped so as to suppress evaporative fuel inside the intake passage from flowing outside through the air cleaner. The evaporative fuel trapped inside the intake passage passes through a bypass passage that provides communication between the intake passage and the canister, and is then adsorbed with an adsorbent in the canister. A blow-by passage is also connected to the intake passage that is closed off by the shut off valve. Because the blow-by passage is closed off by a blow-by valve, which is closed during normal operation when the engine is stopped, sticking of the shut off valve and the throttle valve and the like due to the inflow of blow-by gas into the intake passage is inhibited.
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