Method of compensating fuel for each cylinder of an engine during purging

A method of compensating fuel for each cylinder of an engine during purging, the method comprising:

• measuring a pressure of an intake air flowing into each cylinder through an intake manifold of the engine and determining an amount of intake air for each cylinder from a pressure of the intake air introduced into each cylinder;
• setting a target purge amount depending on a total amount of vaporized gas adsorbed into a canister and determining a number of revolutions of an purge pump and an opening timing and an opening amount of a Purge Control Solenoid Valve (PCSV) which satisfy the target purge amount;
• estimating an amount of vaporized gas and an amount of air to be introduced into each cylinder upon determining that the target purge amount is satisfied;
• and
• correcting a fuel amount supplied to each cylinder in consideration of the amount of vaporized gas and the amount of air to be introduced into each cylinder upon determining that the amount of intake air for each cylinder and the target purge amount are satisfied.