Patent ID: 6990963
Filing Date: 2006-01-31
Classification: F02D,F02M

Abstract:
1. A vaporized fuel processing system comprising: a canister for storing an adsorbent; a charge passageway which establishes a communication between a fuel tank and the canister so as to charge vaporized fuel from the fuel tank into the canister so that the vaporized fuel so charged is adsorbed onto the adsorbent in the canister; a purge passageway which establishes a communication between the canister and an induction system of an internal combustion engine so that the vaporized fuel released from the adsorbent is purged into the induction system; an atmospheric passageway which establishes a communication between the canister and the atmosphere; a purge control valve interposed along the length of the purge passageway for opening and closing the purge passageway; a charge passageway opening and closing valve interposed along the length of the charge passageway for opening and closing the charge passageway; a pressure relief section interposed along the length of the atmospheric passageway; and a purge control section for controlling the opening of the purge control valve so as to control the purging, wherein the purge control section activates the pressure relief section so as to reduce an inside pressure of the canister to a first predetermined negative pressure while preventing an inside pressure of the fuel tank from becoming an excessively negative pressure by closing the charge passageway opening and closing valve, whereby the purging is controlled while the inside pressure of the canister is being relieved.