HYDROGEN CONCENTRATION ESTIMATING METHOD FOR FUEL BATTERY AND HYDROGEN CONCENTRATION ESTIMATING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a hydrogen concentration estimating method and a hydrogen concentration estimating device that can estimate the hydrogen concentration in a fuel battery with higher accuracy.SOLUTION: There are acquired anode gas temperature in an anode gas circulation flow path in a fuel battery system having a fuel battery, the differential pressure between an inlet and an outlet of a circulation pump provided in the anode gas circulation flow path, and the rotation speed of the circulation pump, the gas density in the anode gas circulation flow path is estimated from the differential pressure based on a pressure loss characteristic of the anode gas circulation flow path and a pressure-flow rate characteristic of the circulation pump, the relative humidity in the fuel battery is estimated, and the hydrogen concentration is calculated by using relative humidity based on the anode gas temperature, the differential pressure, and the gas density.SELECTED DRAWING: Figure 5