Patent ID: 8770175

Claim:
An evaporation fuel processing system comprising: a first communication passage through which an evaporation fuel generated inside of a fuel tank that stores fuel is introduced; a canister connected to the first communication passage and which adsorbs the evaporation fuel; a second communication passage that communicates between the canister and an intake passage of an internal combustion engine; a purging processor for purging the evaporation fuel adsorbed by the canister into the internal combustion engine through the second communication passage; an adsorption amount detecting mechanism which detects an amount of the evaporation fuel adsorbed by the canister by means of filling of the fuel, at a time when the fuel is filled into the fuel tank; a breakthrough time calculating mechanism for calculating, while the internal combustion engine is stopped, a time based on the detected adsorption amount, at which the canister would experience breakthrough in the event that the evaporation fuel were not purged into the internal combustion engine from the canister; a controller for carrying out purge processing by the purging processor based on the calculated time.