Patent ID: 8349507
Filing Date: 2013-01-08
Classification: H01M,Y02E,Y02T

Abstract:
1. A method for determining how long a fuel cell system has not delivered hydrogen to an anode side of a fuel cell stack after a system shut-down, said method comprising: determining whether the system has been shut-down; incrementing a stand-by time if the system has been shut-down and a key is in a vehicle ignition; incrementing a shut-off off time if the system has been shut-down and the key is out of the vehicle ignition; determining whether the ignition has been turned on after a previous ignition off event; adding the stand-by time and the shut-off time to provide an off-time that can be used to determine the gas constituency in the anode side of the stack; and determining whether dilution air is being provided from a compressor to dilute anode exhaust.