To provide a fuel cell system capable of reducing variations in sound pressure of the converter noise generated during the impedance measurement.
A superimposed signal generator unit 125 generates the impedance measurement signal with its amplitude gradually changed in accordance with a command from a superimposition timing command unit 120. In concrete terms, the superimposed signal generator unit 125 generates the impedance measurement signal with its amplitude gradually increased upon receipt of a generation start command for the impedance measurement signal, while generating the impedance measurement signal with its amplitude gradually decreased upon receipt of a generation stop command for the impedance measurement signal. A voltage command signal generator unit 130 superimposes the output target voltage supplied from a target voltage decision unit 110 onto the impedance measurement signal supplied from the superimposed signal generator unit 125 to provide this output to a DC/DC converter 30 as a voltage command signal Vfcr.
COPYRIGHT: (C)2007,JPO&INPIT
Masahiro Shigeru
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Shinji Oga
Toshifumi Onuki