Contactor failure detecting apparatus for fuel cell system
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United States of America Patent
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May 7, 2013
Grant Date -
Mar 24, 2011
app pub date -
Nov 24, 2010
filing date -
May 10, 2006
priority date (Note) -
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Abstract
A contactor electrically connects and disconnects a fuel cell from a load. When a failure-detecting mode for detecting a closing failure of a contactor is initiated, an opening command is transmitted to the contactor, and a DC/DC converter connected to a motor changes the load voltage. Then, the load voltage and a fuel cell voltage are compared with each other. If the contactor is in a normal open state, as a result of the opening command, the fuel cell voltage is constant, whereas the load voltage of the DC/DC converter decreases, thereby producing a voltage difference. A closing failure of the contactor is determined when it is detected that the fuel cell voltage is substantially equal to the load voltage.
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