Fuel cell system
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United States of America Patent
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Apr 30, 2013
Grant Date -
Oct 21, 2010
app pub date -
Oct 23, 2008
filing date -
Nov 8, 2007
priority date (Note) -
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Abstract
There is provided an impedance measuring system which can accurately measure the impedance of a fuel cell. A motor rotation number detection unit successively detects the rotation number of a motor controlled by an inverter and outputs the detection result to a superposition signal generation unit. The superposition signal generation unit sets the frequency of an impedance measuring signal to a non-resonant frequency so that the control signal of the motor will not resonate with the impedance measuring signal. Thus, by setting the frequency of the impedance measuring signal to the non-resonant frequency, the resonance with the motor is suppressed, which can improve impedance measurement accuracy.
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