METHOD FOR DIAGNOSING LEAKAGE OF FUEL TANK OF HYBRID VEHICLE

摘要

A method for diagnosing fuel leakage of a hybrid vehicle is disclosed. According to the present invention, the method for diagnosing fuel leakage of a hybrid vehicle is as follows: calculating steam pressure in a fuel tank based on the temperature and pressure of a fuel in the fuel tank after closing a canister blocking valve and a purge valve when an engine is stopped during driving; calculating the amount of changed temperature and pressure in the fuel tank after opening the canister blocking valve at the time of diagnosing fuel leakage; and diagnosing the leakage of the fuel in the fuel tank based on the calculated amount of changed pressure and the calculated steam pressure. The method for diagnosing fuel leakage of a hybrid vehicle can prevent harmful gas from being discharged, thereby preventing environment from being polluted due to leakage of evaporated gas of a fuel tank of a hybrid vehicle.