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US 2011/0300461 A1Published application
Fuel cell system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKota Manabe, Masahiro Shige
Life of this patent
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Abstract
There is provided a fuel cell system in which a constantly accurate impedance measurement is made possible regardless of a response characteristic of the voltage converting device. A superimposed signal analysis section analyzes an impedance measuring signal after passing through a DC/DC converter to thereby notify a superimposed signal amplitude control section of an analysis result. A superimposed signal amplitude control section controls an amplitude value of the impedance measuring signal generated by a superimposed signal generating section based on the result notified from the superimposed signal analysis section.
Claims13
A fuel cell system including:
- a fuel cell;
- and
- a voltage converting device for controlling an output voltage of the fuel cell;
- wherein the fuel cell system comprises:
- output means for superimposing an impedance measuring signal on an output target voltage of the voltage converting device and outputting the voltage to the voltage converting device in a case where an impedance of the fuel cell is measured;
- measurement means for measuring an amplitude of the impedance measuring signal after passing through the voltage converting device;
- and
- control means for controlling an amplitude of the impedance measuring signal before passing through the voltage converting device based on a measurement result by the measurement means.
5 more elements
A fuel cell system including:
- a fuel cell;
- an electric accumulator interposed in a discharge path of the fuel cell and connected in parallel to the fuel cell;
- and
- a voltage converting device connected between the electric accumulator and the fuel cell;
- wherein the fuel cell system comprises:
- output means for superimposing an impedance measuring signal on an output target voltage of the voltage converting device and outputting the voltage to the voltage converting device, when an impedance of the fuel cell is measured by using an AC impedance method;
- measurement means for measuring an amplitude of the impedance measuring signal after passing through the voltage converting device;
- and
- control means for controlling an amplitude of the impedance measuring signal before passing through the voltage converting device based on a measurement result by the measurement means.
6 more elements
A fuel cell system including:
- a fuel cell;
- and
- a voltage converting device for controlling an output voltage of the fuel cell;
- wherein the fuel cell system comprises:
- output means for superimposing an impedance measuring signal on an output target voltage of the voltage converting device and outputting the voltage to the voltage converting device, when an impedance of the fuel cell is measured;
- judgment means for judging a state of a response characteristic of the voltage converting device during the impedance measurement;
- and
- control means for controlling an amplitude of the impedance measuring signal based on the state of the response characteristic of the voltage converting device judged by the judgment means.
5 more elements
A fuel cell system including:
- a fuel cell;
- and
- a voltage converting device for controlling an output voltage of the fuel cell;
- wherein the fuel cell system comprises:
- output means for superimposing an impedance measuring signal on an output target voltage of the voltage converting device and outputting the voltage to the voltage converting device, when an impedance of the fuel cell is measured;
- and
- judgment means for judging a state of a response characteristic of the voltage converting device;
- wherein the output means superimposes the impedance measuring signal on the output target voltage of the voltage converting device and outputting the voltage to the voltage converting device in a case where the judgment means judges that the response characteristic of the voltage converting device is in a stable state.
5 more elements
A fuel cell system including:
- a fuel cell;
- an electric accumulator interposed in a discharge path of the fuel cell and connected in parallel to the fuel cell;
- and
- a voltage converting device connected between the electric accumulator and the fuel cell;
- wherein the fuel cell system comprises:
- output means for superimposing an impedance measuring signal on an output target voltage of the voltage converting device and outputting the voltage to the voltage converting device, when an impedance of the fuel cell is measured by using an AC impedance method;
- and
- judgment means for judging a state of a response characteristic of the voltage converting device;
- wherein the output means superimposes the impedance measuring signal on the output target voltage of the voltage converting device and outputting the voltage to the voltage converting device in a case where the judgment means judges that the response characteristic of the voltage converting device is in a stable state.
6 more elements
Dependencies are inferred from the claim text.