Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
July 21, 2009
Patent Application Number
11684967
Date Filed
March 12, 2007
Patent Primary Examiner
Patent abstract
Methods and apparatus are provided for monitoring a coolant conductivity of a fuel cell supplying power via positive and negative buses. The method includes measuring a first voltage of the positive bus, measuring a second voltage of the negative bus, applying a resistance between the positive bus and a reference potential, measuring a third voltage of the positive bus after a period of applying the resistance, and determining an isolation resistance based on the measured voltages. The isolation resistance is a function of the coolant conductivity.
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