Estimation method for a fuel cell inside the liquid water, the method of estimating the liquid water discharged from the fuel cell, the fuel cell internal liquid water estimation device, a fuel cell system

The estimated value of the fuel cell inside the liquid amount of water during operation, by the following steps (a) ~ (d), by sequentially acquired every predetermined time period, to improve the detection accuracy of the moisture state of the fuel cell . (A) to obtain an estimate of the last time. (B) the estimated value of the previous, based on the value representing the flow rate of the reaction gas in the current of the fuel cell, to obtain the rate of drainage is liquid water discharged from the fuel cell per unit time. And (c) draining rate, by multiplying the period of acquiring the estimated value to obtain a liquid volume of water discharged from the fuel cell to a predetermined time period. (D) a predetermined period of time by using a liquid water discharged from the fuel cell, to obtain the present estimated value.