System and method for controlling fuel cell system

摘要

Disclosed is a system and method for controlling a fuel cell system. More specifically, a fuel cell demand current is calculated based on a driver demand current calculated from a driver demand torque. Then a target flow rate-1 of air to be supplied to a fuel cell stack is calculated based on the fuel cell demand current and a target stoichiometric ratio (SR) of air. The target flow rate-1 is then compensated for using the target SR, an RPM command value of an air blower is calculated based on a compensated target flow rate-2 and the amount of air currently measured. The operation of the air blower is subsequently controlled based on the calculated RPM command value.

主权项

1. A method for controlling a fuel cell system, the method comprising:
calculating, by a processor, a fuel cell demand current based on a driver demand current calculated from a driver demand torque; calculating, by the processor, a first target flow rate of air to be supplied to a fuel cell stack based on the fuel cell demand current and a target stoichiometric ratio (SR) of air; calculating, by the processor, a calculated SR based on an air flow rate and a fuel cell current; compensating, by the processor, for the first target flow rate using the target SR and the calculated SR, wherein the target SR is calculated according to a relative humidity value of the fuel cell stack and is preset to increase proportionally based on the relative humidity and the calculated SR is equal to the air flow rate divided by the fuel cell current time a constant; and calculating, by the processor, a revolutions per minute (RPM) command value of an air blower based on a compensated second target flow rate and the amount of air currently measured and controlling the operation of the air blower based on the calculated RPM command value.