Evaporative fuel control device

摘要

An evaporative fuel control device for an engine used in an automobile is provided. The device comprises a charcoal canister for temporary adsorbing fuel vapor produced in a fuel tank, an air introducing means for introducing air into the canister, a purge control means for controlling the amount of purge gas, purged from the canister into a intake passage of the engine and containing air and fuel vapor desorbed from the canister therein, a purge gas amount detecting means for detecting the amount of the purge gas, an air amount detecting means for detecting the amount of air introduced into the charcoal canister and a desorbed fuel amount calculating means for calculating the amount of fuel desorbed from the canister on the basis of the amount of purge gas detected by the purge gas amount detecting means and the amount of air introduced into the charcoal canister detected by the air amount detecting means. The purge control means controls the amount of purge gas on the basis of the amount of fuel desorbed from the canister calculated by the desorbed fuel amount calculating means.