Fuel Cell System
First Claim
1. A fuel cell system comprising:
- a measurement device for measuring an impedance of a fuel cell in a predetermined frequency region;
a storage device for storing a plurality of impedance adapted values in the predetermined frequency region based on an output current and a temperature of the fuel cell;
a determination device for detecting the output current and the temperature of the fuel cell to determine an optimum impedance adapted value from the plurality of impedance adapted values stored in the storage device based on the detected output current and temperature; and
a regulation device for regulating an amount of a gas to be supplied to the fuel cell based on a measured value of the impedance in the predetermined frequency region.
1 Assignment
0 Petitions
Accused Products
Abstract
A fuel cell system according to the present invention is characterized by comprising a measurement unit which measures an impedance of a fuel cell in a predetermined frequency region, and a regulation unit which regulates an amount of a gas to be supplied to the fuel cell based on a measured value of the impedance in the predetermined frequency region. According to such a constitution, the impedance of the fuel cell in the predetermined frequency region (e.g., a low frequency region) is measured, and the amount of the gas (e.g., an amount of an oxidizing gas) to be supplied to the fuel cell is regulated based on this measured value of the impedance. Here, since the impedance of the fuel cell in the predetermined frequency region largely differs with a fuel supply state (see FIG. 2), the amount of the gas to be supplied to the fuel cell can be regulated based on the measured value of the impedance to realize a highly efficient and stable operation.
-
Citations
10 Claims
-
1. A fuel cell system comprising:
-
a measurement device for measuring an impedance of a fuel cell in a predetermined frequency region; a storage device for storing a plurality of impedance adapted values in the predetermined frequency region based on an output current and a temperature of the fuel cell; a determination device for detecting the output current and the temperature of the fuel cell to determine an optimum impedance adapted value from the plurality of impedance adapted values stored in the storage device based on the detected output current and temperature; and a regulation device for regulating an amount of a gas to be supplied to the fuel cell based on a measured value of the impedance in the predetermined frequency region. - View Dependent Claims (4, 5)
-
-
2-3. -3. (canceled)
-
6. The fuel cell system comprising:
-
a measurement device for measuring an impedance of a fuel cell in a predetermined frequency region; a regulation device for regulating an amount of a gas to be supplied to the fuel cell based on a measured value of the impedance in the predetermined frequency region; and a voltage conversion device inserted in a discharge path of the fuel cell, wherein the measurement device superimposes a signal for impedance measurement on an output target voltage of the voltage conversion device to measure the impedance of the fuel cell based on the signal for impedance measurement which has passed through the voltage conversion device. - View Dependent Claims (7, 8, 9, 10)
-
Specification