Patent ID: 6807851
Filing Date: 2004-10-26
Classification: F02M

Abstract:
A leak-check apparatus for an engine's fuel-vapor-processing system wherein:a canister is provided on a connecting pipe linking a fuel tank to an intake pipe of the engine; fuel evaporation gas resulting from evaporation of fuel in the fuel tank is absorbed into the canister; the amount of the fuel evaporation gas purged from the canister to the intake pipe is controlled by opening and closing a purge valve provided on the downstream side of the canister according to a running state of the engine; and a fresh air passage of the canister is opened and closed by a canister valve, the leak-check apparatus comprising: an engine-running-state leak-check means for checking a leak in the fuel-vapor-processing system in a running state of the engine; and an engine-stopped-state leak-check means for checking a leak in the fuel-vapor-processing system in a stopped state of the engine, wherein the engine-stopped-state leak-check means checks a leak in the fuel-vapor-processing system when the engine-running-state leak-check means determines existence of a leak in the fuel-vapor-processing system.