State detection device and method for fuel cell
First Claim
1. A state detection device for fuel cell, comprisinga controller programmed to:
- set a predetermined high-frequency impedance value on the basis of an impedance measurement value belonging to an arc region of an impedance curve of the fuel cell;
obtain an actually measured high-frequency impedance value on the basis of an impedance measurement value belonging to a non-arc region of the impedance curve of the fuel cell;
estimate a value obtained by subtracting the actually measured high-frequency impedance value from the predetermined high-frequency impedance value as an ionomer resistance value; and
set a value of an intersection of an equivalent circuit impedance curve set on the basis of an impedance measurement value belonging to the arc region and a real axis as the predetermined high-frequency impedance value.
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Abstract
A state detection device for fuel cell includes a supposed high-frequency impedance value setting unit configured to set a supposed high-frequency impedance value on the basis of an impedance measurement value belonging to an arc region of an impedance curve of the fuel cell, an actually measured high-frequency impedance value calculation unit configured to obtain an actually measured high-frequency impedance value on the basis of an impedance measurement value belonging to a non-arc region of the impedance curve of the fuel cell, and an ionomer resistance estimation unit configured to estimate a value obtained by subtracting the actually measured high-frequency impedance value from the supposed high-frequency impedance value as an ionomer resistance value. The supposed high-frequency impedance value setting unit sets a value of an intersection of an equivalent circuit impedance curve set on the basis of the impedance measurement value belonging to the arc region and a real ads as the supposed high-frequency impedance value.
11 Citations
18 Claims
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1. A state detection device for fuel cell, comprising
a controller programmed to: -
set a predetermined high-frequency impedance value on the basis of an impedance measurement value belonging to an arc region of an impedance curve of the fuel cell; obtain an actually measured high-frequency impedance value on the basis of an impedance measurement value belonging to a non-arc region of the impedance curve of the fuel cell; estimate a value obtained by subtracting the actually measured high-frequency impedance value from the predetermined high-frequency impedance value as an ionomer resistance value; and set a value of an intersection of an equivalent circuit impedance curve set on the basis of an impedance measurement value belonging to the arc region and a real axis as the predetermined high-frequency impedance value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A state detection method for fuel cell, comprising:
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a predetermined high-frequency impedance value setting step of setting a predetermined high-frequency impedance value on the basis of an impedance measurement value belonging to an arc region of an impedance curve of the fuel cell; an actually measured high-frequency impedance value calculation step of obtaining an actually measured high-frequency impedance value on the basis of an impedance measurement value belonging to a non-arc region of the impedance curve of the fuel cell; and an ionomer resistance estimation step of estimating a value obtained by subtracting the actually measured high-frequency impedance value from the predetermined high-frequency impedance value as an ionomer resistance value; a value of an intersection of an equivalent circuit impedance curve set on the basis of an impedance measurement value belonging to the arc region and a real axis being set as the predetermined high-frequency impedance value in the predetermined high-frequency impedance value setting step.
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Specification