Patent ID: 6708682
Filing Date: 2004-03-23
Classification: F02D,F02M

Abstract:
An evaporated fuel processing apparatus for an internal combustion engine, comprising:a canister that traps fuel vapors generated in a fuel tank; a purge control valve disposed between the canister and an intake passage of the internal combustion engine; and a controller that: determines a quantity of purge gas that passes through the purge control valve; determines a fuel injection amount correction coefficient for eliminating a deviation of an actual air-fuel ratio from a target air-fuel ratio due to the purge gas; determines a fresh air ratio that represents a ratio of purge air contained in the purge gas to the purge gas, based on the fuel injection amount correction coefficient; determines a quantity of the purge air based on the quantity of the purge gas and the fresh air ratio; and controls the internal combustion engine based on the quantity of the purge air.