Patent ID: 8869528

Claim:
A method for determining intake air leakage in a low pressure EGR system, the method comprising: a first step of measuring an intake air leaking amount Leak_Air; a second step of determining whether intake air is leaked by comparing the intake air leaking amount Leak_Air is smaller than an intake air leakage determination value Leak_Air_Det, wherein when it is determined that the intake air leaking amount Leak_Air is smaller than the intake air leakage determination value Leak_Air_Det, the second step further includes: accumulating leaked amount for a predetermined accumulation time; determining an intake air leaking amount accumulation value Leak_Air_Accu based on the accumulated leaked amount; comparing the intake air leaking amount accumulation value Leak_Air_Accu with an intake air leakage accumulation determination value Leak_Air_Inter; and settling the intake air leakage when the intake air leaking amount accumulation value Leak_Air_Accu is larger than the intake air leakage accumulation determination value Leak_Air_Inter; and a third step of notifying leakage information against an intake air leakage when the intake air leakage is settled.