| 摘要 |
<p>A purge system for fuel cell stack (12) includes a purge valve (70) to regulate exhaust from the fuel cell stack in response control signals from a controller in response to a voltage across a purge cell portion (36) of a fuel cell stack. The purge valve is opened when the voltage across the purge cell portion falls below a defined percentage of a threshold voltage, which is based on the actual voltage of one or more cells in the stack. The threshold voltage can be equal to an average cell voltage of some or all of the fuel cells of the fuel cell stack. The purge may include on or more successive openings of the purge valve of controlled purge durations. The purge duration may be adjusted depending on the instantaneous current flow through the stack.</p> |
