| 摘要 |
A method and apparatus for detecting leakage current in the coolant of a fuel cell stack (60) between said stack (60) and the grounded stack chassis (62), using a voltmeter to measure the voltage (V1) across the coolant. If the coolant voltage (V1) is at or below a predetermined level, an excessive level of conductivity in the coolant exists, and the presence of leakage current is reported. The invention can also compare the coolant voltage (V1) to two different predetermined voltage levels, the second one higher than the first. A coolant voltage (V1) at or below the lower voltage level could signal a shut down of the stack (60), while a coolant voltage (V1) at or below the higher voltage level could signal an alarm or another diagnostic. The invention can optionally use a second voltmeter to measure the voltage (V2) across the stack (60) and calculate the resistivity and conductivity of the coolant. <IMAGE> |
