FUEL CELL SYSTEM

摘要

A fuel cell system sets the larger one of a stack request compressor supply flow rate calculated based on a request of a fuel cell stack and a system request compressor supply flow rate calculated based on a request by the fuel cell system as a target compressor supply flow rate and controls a compressor according to the target compressor supply flow rate. The fuel cell system also controls a bypass valve based on a stack supply flow rate and a target stack supply flow rate to be supplied to the fuel cell stack. The fuel cell system fixes the bypass valve or limits the drive of the bypass valve when the system request compressor supply flow rate is set as the target compressor supply flow rate and the stack supply flow rate becomes smaller than the target stack supply flow rate.

主权项

1. A fuel cell system, comprising:
a cathode gas supply passage through which cathode gas is supplied to a fuel cell stack; a compressor provided on the cathode gas supply passage; a bypass passage through which a part of the cathode gas discharged from the compressor is eliminated by bypassing the fuel cell stack; a bypass valve provided on the bypass passage, the bypass valve being configured to adjust a flow rate of the cathode gas flowing through the bypass passage; a stack supply flow rate detecting unit configured to detect a stack supply flow rate supplied to the fuel cell stack; a compressor control unit configured to set larger one of a stack request compressor supply flow rate and a system request compressor supply flow rate as a target compressor supply flow rate, the stack request compressor supply flow rate being calculated based on a request by the fuel cell stack, the system request compressor supply flow rate being calculated based on a request by the fuel cell system, the compressor control unit being configured to control the compressor according to the set target compressor supply flow rate; a bypass valve control unit configured to control the bypass valve based on the stack supply flow rate and a target stack supply flow rate to be supplied to the fuel cell stack; and a regulating unit configured to fix the bypass valve or limit driving of the bypass valve when the system request compressor supply flow rate is set as the target compressor supply flow rate and the stack supply flow rate becomes smaller than the target stack supply flow rate.