To reduce the cost during purge for Fuel Cell Vehicles (FCVs), it is necessary to maintain water content inside FCV appropriately and to save the purge time by restraining the increase of water content. Considering the mount-ability onto vehicles, low and high two-frequency superimposed impedance measurement was adopted to clarify the water behavior. It was verified that oxygen diffusion resistance was influenced by oxygen transport both inside inomer and voids. R void which is a parameter of water content was calculated, and correlation between them and the approximate equation became clear. Moreover, we suggested a feedback system of water content to FCV operation and the controlling method.
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