Fuel cell purging control method

A fuel cell purging control method for controlling hydrogen purge of a fuel cell including a stack having an anode and a cathode, an air supply device having an air supply line supplying air to the cathode of the stack, and a hydrogen supply device supplying hydrogen to the anode of the stack, the fuel cell purging control method comprising the steps of:

• determining, by a controller, the hydrogen purge of the fuel cell while the fuel cell is being normally operated;
• fixing revolutions per minute (RPM) of the air supply unit of the fuel cell to a previous RPM and maintaining the RPM when hydrogen purge is determined in the purge determining operation;
• and
• purging hydrogen in the anode of the fuel cell, by opening a purge valve, for a preset period of time after the step of fixing the RPM

A fuel cell purging control system for controlling hydrogen purge of a fuel cell, comprising:

• a stack having an anode and a cathode;
• an air supply device having an air supply line supplying air to the cathode of the stack;
• a back pressure adjusting valve configured to adjust back pressure of the air supply device when the hydrogen purge is determined;
• a hydrogen supply device supplying hydrogen to the anode of the stack;
• and
• a purge valve configured to purge hydrogen in the anode of the fuel cell for a preset period of time after the back pressure adjusting valve is opened,
• wherein the hydrogen purge of the fuel cell is determined while the fuel cell is being normally operated.