EMISSION CONTROL METHOD OF RECIRCULATION EXHAUST GAS USING THE LOAD FLUCTUATION OF HYDROGEN BLOWER IN A FUEL CELL SYSTEM

摘要

A method for controlling the ventilation of recirculation mixture gas by using the load fluctuation of a hydrogen blower of a fuel cell system is provided to optimize the opening/closing of a ventilation valve and the ventilation time of a mixture gas, to reduce the amount of wasted hydrogen and to increase the lifetime of a ventilation valve. A method for controlling the ventilation of recirculation mixture gas comprises the steps of inputting the performance map of a hydrogen blower; determining the recirculation amount of a hydrogen blower and operating a hydrogen recirculation system according to the operation of a fuel cell system; measuring the load value of a hydrogen blower motor; comparing the load value and the upper limit permitted in the safe operation range of the hydrogen recirculation system and opening a ventilation valve to exhaust a mixture gas if the load value is greater than the upper limit; measuring continuously the load value of the hydrogen blower motor in the opened state of the ventilation valve; and opening the ventilation valve to intercept the exhaust of the mixture gas if the measured load value is smaller than the lower limit permitted in the save operation range of the hydrogen recirculation system.