METHOD AND SYSTEM FOR DIAGNOSING FUEL CELL STACK

摘要

Disclosed is a method for diagnosing a fuel cell stack which can analyze an ohmic resistance value through cooperation control logic of a fuel cell control unit, a motor control unit and a power conversion control unit. The method for diagnosing a fuel cell stack according to one embodiment of the present invention comprises the steps of; deciding a time requiring the diagnosis of the fuel cell stack based on a plurality of factors: operating a motor by a first efficiency value for a first predetermined reference time depending on the decided result; operating the motor by a second efficiency value, after the first reference time passes; and diagnosing a state of the fuel cell stack depending on voltage variation of the fuel cell stack when respectively operating the motor by the first efficiency value and the second efficiency value.