leak diagnosis system using purge pump of active purge system and leak diagnosis method using purge pump of active purge system

摘要

The present invention relates to a leak diagnosis system using a purge pump of an active purge system and a leak diagnosis method using a purge pump of an active purge system, and a canister for adsorbing boil-off gas from a fuel tank, and a purge line connecting the canister and an intake pipe and a purge pump and purge control valve mounted on the purge line, and an auxiliary canister and auxiliary canister control valve mounted on the purge line to be located between the intake pipe and the purge control valve, and auxiliary during leak diagnosis. Since the canister control valve maintains the closed state, BOG does not flow into the intake pipe during leak diagnosis, and ultimately, the air filter provided in the intake pipe is contaminated or BOG is prevented from flowing out through the intake pipe. A leak diagnosis system using a purge pump of an active purge system and a leak diagnosis method using a purge pump of an active purge system are provided.