Patent ID: 11002201

Abstract:
A method of determining an air volume in an active purge system may include checking whether an engine operates in an idle state; determining an air volume reaching a combustion chamber of the engine in response to a signal received from a sensor provided in an intake pipe; checking whether an evaporation gas collected in a canister is introduced into the intake pipe; estimating an amount of the evaporation gas introduced into the intake pipe and primarily correcting the air volume determined according to the estimated amount of the evaporation gas; checking whether an opening holding time of an intake valve in the engine is varied due to an operation of a continuously variable valve duration (CVVD) system electrically connected to the controller; and deriving a correction variable by substituting an operation duty of the CVVD system into a formula, a table, or a map provided in advance, and secondarily correcting the primarily corrected air volume according to the correction variable.