Patent ID: 8808932

Claim:
A fuel cell system, comprising: an adsorber placed on an air supply path to an air electrode of a fuel cell, the adsorber housing a chemical filter for adsorbing an impurity contained in air; a measurement unit configured to measure an air quantity having passed through the adsorber per unit time, comprising a measuring element located downstream of the chemical filter; a detection unit to detect a concentration of the impurity contained in air of the air quantity measured by the measurement unit before the air enters the adsorber, wherein the detection unit is located only on an upstream of the chemical filter; an estimation unit to estimate a quantity of the impurity adsorbed onto the chemical filter per unit time based on the air quantity, the concentration of the impurity, and an adsorption efficiency of the chemical filter; and an output control unit to allow a signal to be output when a cumulative value of the quantity of the impurity exceeds a predetermined value, wherein the fuel cell system does not have, on a downstream of the chemical filter, any detection unit to detect a concentration of the impurity contained in air.