| 摘要 |
In a fuel cell system equipped with polymer electrolyte fuel cells, an alternating current generator applies an alternating current of a fixed frequency and a fixed amplitude to the fuel cells. An alternating current voltage acquisition module (combination of a filter unit and an A-D converter with a controller) extracts an alternating current component attributed to the application of the alternating current from an output voltage in a specific unit cell of the fuel cells and time-sequentially obtains a voltage value of the extracted alternating current component. A moisture state monitoring module (the controller) identifies whether the fuel cells have a moistening tendency. In the case of identification of the moistening tendency of the fuel cells by the moisture state monitoring module, an over-hydration detection module (the controller) computes a statistical value representing a magnitude of a variation in time-sequentially obtained voltage value of the alternating current component and determines that the fuel cells are in an over-hydration state when the computed statistical value representing the magnitude of the variation exceeds a preset reference level.
|
