FUEL CELL SYSTEM AND CONTROL METHOD THEREFOR

摘要

A fuel cell system includes: a motor; a fuel cell and an electrical storage device connected to the motor in parallel with each other; a first voltage converter between the motor and the fuel cell; a second voltage converter between the motor and the electrical storage device; a load circuit between the motor and both the first and second voltage converters; and a control unit. The control unit stops boost operation of the first voltage converter when conditions VFC > VM_min and VFC > VBAT + a whereas the control unit prohibits a stop of the boost operation of the first voltage converter when the conditions are not satisfied, wherein in the conditions, VFC is a fuel cell terminal voltage, VBAT is an electrical storage device terminal voltage and VM_min is a load circuit input terminal voltage, set to minimize a system loss while ensuring a torque required of the motor.