Patent ID: 8771895
Filing Date: 2014-07-08
Classification: H01M,Y02E

Abstract:
1. A method for determining a flow rate of an anode exhaust gas through an anode bleed valve from an anode side of a fuel cell stack, said method comprising: estimating a bleed flow rate of the anode exhaust gas through the bleed valve that maintains a hydrogen concentration in the anode exhaust gas below a predetermined percentage based on the amount of air in a cathode output from the fuel cell stack, said bled anode exhaust gas being fed into the cathode output from the fuel cell stack; using a valve orifice model for the bleed valve to estimate an anode side pressure set-point that is necessary to supply the estimated bleed flow rate; and providing hydrogen to the anode side of the fuel cell stack that maintains the anode side pressure set-point.