Patent ID: 9153828
Filing Date: 2015-10-06
Classification: H01M,Y02E

Abstract:
1. A method for identifying a failure of determining water content in a fuel cell stack, said method comprising: providing a cathode air flow to a cathode side of the fuel cell stack; providing a cathode outlet gas to the cathode air flow to provide humidification for increasing the water content of the cathode inlet air; providing a high frequency resistance (HFR) humidification signal from an HFR circuit that determines water content in the fuel cell stack; providing a relative humidity (RH) signal from an RH sensor that measures the RH in the cathode air flow; using a water buffer model for determining the water content of the fuel cell stack based on inputs from a plurality of system components; using a water transfer model for determining the amount of water transferred to the cathode air flow using water content estimates from the water buffer model; revising the water transfer model using the HFR humidification signal or the RH signal; and determining whether the RH sensor or the HFR circuit is operating properly.