Patent ID: 8642223

Claim:
A method for providing a request for hydrogen flow from an anode subsystem to a cathode subsystem of a fuel cell system, said method comprising: receiving a request for the hydrogen flow from the anode subsystem to the cathode subsystem; providing a predetermined amount of the requested hydrogen flow from the anode subsystem to the cathode subsystem, said predetermined amount being less than the requested amount of hydrogen flow; determining an injector flow estimation for the hydrogen flowing through an injector to the anode subsystem; determining a valve flow estimation for the hydrogen flowing through a valve in a line that connects the anode subsystem to the cathode subsystem; calculating an error that is a difference between the injector flow estimation and the valve flow estimation; and completing the request for hydrogen flow by providing the entire amount of hydrogen that has been requested from the anode subsystem to the cathode subsystem if the calculated error is below a predetermined threshold, and adjusting the request for hydrogen flow if the calculated error is above the predetermined threshold.