Hydrogen purging device and method for fuel cell system

A hydrogen purging method for a fuel cell system, comprising:

• receiving and monitoring, by a controller, an operating state detected in real time from an operating state detector of a fuel cell stack;
• obtaining, by the controller, at every predetermined accumulation period, a variable purge charge amount that corresponds to a current stack operating state from a map;
• calculating, by the controller, a charge amount for a time period the accumulation period using a predetermined reference purge charge amount, and performing accumulation by accumulating the calculated charge amount every accumulation period;
• and
• determining, by the controller, an opening time of a hydrogen purge valve by comparing the accumulated charge amount with the reference purge charge amount, and opening the hydrogen purge value at the opening time.

A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:

• program instructions that receive and monitor an operating state detected in real time from an operating state detector of a fuel cell stack;
• program instructions that obtain at every predetermined accumulation period, a variable purge charge amount that corresponds to a current stack operating state from a map;
• program instructions that calculate a charge amount for a time period the accumulation period using a predetermined reference purge charge amount, and performing accumulation by accumulating the calculated charge amount every accumulation period;
• and
• program instructions that determine an opening time of a hydrogen purge valve by comparing the accumulated charge amount with the reference purge charge amount, and opening the hydrogen purge value at the opening time.