Patent ID: 8815459
Filing Date: 2014-08-26
Classification: H01M,Y02E

Abstract:
1. A cell stoichiometric ratio calculation apparatus for a fuel cell system comprising: means for acquiring a cell voltage of a unit cell of a fuel cell that is supplied with a prescribed gas to generate electronic power; means for calculating the average cell voltage by averaging the cell voltages of each unit cell; means for varying the stoichiometric ratio of the prescribed gas that is supplied to the fuel cell when a setting value for the stoichiometric ratio is varied from a reference value to another value; means for acquiring an approximating equation representing a relationship between the stoichiometric ratio and the rate of change of the average cell voltage when the setting value for the stoichiometric ratio is varied from the reference value to the another value; and means for calculating the rate of change of the cell voltage of each unit cell when the setting value for the stoichiometric ratio is varied from the reference value to a prescribed value, wherein the cell stoichiometric ratio calculation apparatus is programmed to calculate the cell stoichiometric ratio for each unit cell based on the rate of change of the cell voltage, using the approximating equation.