Patent ID: 6810861
Filing Date: 2004-11-02
Classification: F02M,Y02T

Abstract:
An evaporative fuel processing unit comprising:a canister that adsorbs an evaporative fuel from a fuel tank of an internal combustion engine with an internal adsorbent in the canister and suppresses discharge of the evaporative fuel into the atmosphere; a first passage in which a first end portion thereof is connected to the canister, and a second end portion thereof is connected to the fuel tank; a second passage in which a first end portion thereof is connected to an intake passage of the internal combustion engine, and a second end portion thereof is connected to the canister; a third passage in which a first end portion thereof is connected to a crankcase of the internal combustion engine, and a second end portion thereof is connected to the intake passage; a first valve that shuts off communication between the canister and the crankcase by closing when the engine is stopped; and a second valve which is provided farther upstream that a location where the second passage and the third passage are connected in the intake passage, the second valve capable of making the downstream of the second valve a substantially closed space by closing off the intake passage.