PEM CONTROLLING PEM FUEL CELL VOLTAGE DURING POWER TRANSITIONS AND IDLING

摘要

The controller 185 of the fuel cell stack 151 in the vehicle 150 is responsive to a low demand to cause the redirector 172 to switch off the cathode Causes all air to be directed from the auxiliary BOP 19 and causes storage in the energy storage system 201 sufficient to limit the battery voltage to the idle voltage threshold if the SOC is not too high and all power not consumed by the auxiliary BOP Limit load 220 to the dimensionally formed stack for consumption of longer lengths or to deplete the stack and supply power to the BOP from the storage. In response to an increase in the demand signal, the controller causes all air to flow to the cathode. In response to the off signal 223 or the start signal 193, the controller results in a shutdown routine or startup routine, where all generated power in each of these routines stores the fuel cell voltage below the threshold to maintain the fuel cell voltage Or is consumed in a voltage limited load.