HUMIDIFICATION CONTROL DEVICE FOR FUEL CELL SYSTEM

PROBLEM TO BE SOLVED: To provide a humidification control device for a fuel cell system that appropriately controls the temperature and humidity of air supplied to a fuel cell stack 1 by a simple structure without using a hygrometer. SOLUTION: The humidification control device is provided for a fuel cell system comprising the fuel cell stack 1 that generates power by causing an electrochemical reaction between a fuel gas and an oxidant gas. The humidification control device comprises: a rotary humidifier 4 that transfers moisture from an oxidant gas discharged from the fuel cell stack 1 to an oxidant gas supplied to the fuel cell stack 1; a required load detecting section 5 that detects a required load for the fuel cell stack 1; temperature detecting sections T1 and T (LLC) that detect the temperatures of the fuel cell stack 1; and a rotation speed control section 6 that controls the rotation speed of the rotary humidifier 4 based on the required load detected by the required load detecting section 5 and the temperatures of the fuel cell stack 1 detected by the temperature detecting sections T1 and T (LLC). The rotation speed control section 6 increases the rotation speed of the rotary humidifier 4 as the required load and the temperature of the fuel cell stack 1 increase. COPYRIGHT: (C)2006,JPO&NCIPI