| 摘要 |
PROBLEM TO BE SOLVED: To provide a humidity control system for a fuel cell stack. SOLUTION: A humidity control system (75) for a fuel cell stack (56) comprises a gas supply source (60) and a humidifier (54). The humidifier has an outlet and an inlet connected to the gas supply source. The fuel stack has an inlet connected to the outlet of the humidifier. A bypass line (80) and a valve (84) make the gas detour the humidifier in order to control the humidity of the gas entering into the fuel stack. The valve is mounted to the bypass line between the gas supply source and the humidifier, or between the gas supply source and the fuel cell stack. The valve is either a gas limiting valve, a throttle valve, or a directional valve. A humidity sensor (78) generates a humidity signal depending on the humidity of the gas entering into the fuel cell stack. The control device connected to the humidity sensor and the valve controls the valve depending on the humidity signal. |
