Method for diagnosing fault in fuel cell system for vehicle, involves comparing air mass flow value detected by air mass flow sensor and pressure value detected by pressure sensors in fuel cell system with predetermined values

摘要

The method involves determining the voltage and pressure values of a fuel cell system (1). The operability of a shutoff valve (17) and operability of a drain valve (20) are determined based on the voltage and pressure values of the fuel cell system. A high-voltage system is activated and an air conveyor (8) is operated for a short time according to the operability of valves. The air mass flow value detected by an air mass flow sensor and the pressure value detected by pressure sensors (21,22) are compared with predetermined values.