US2016141688A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016141688-A1 |
| Application number | US-201514920064-A |
| Country | US |
| Kind code | A1 |
| Filing date | Oct 22, 2015 |
| Priority date | Nov 15, 2014 |
| Publication date | May 19, 2016 |
| Grant date | — |
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A fuel cell system, comprising: a measurer that measures an impedance of the fuel cell; a controller that controls an operation state of the fuel cell; and an acquirer that acquires a dryness degree of the fuel cell from the measured impedance when the operation state is a first operation state, and acquires the dryness degree of the fuel cell as a wet state when the operation state is a second operation state in which a water balance is more than the first operation state.
Opening claim text (preview).
What is claimed is: 1 . A fuel cell system, comprising: a measurer that measures an impedance of the fuel cell; a controller that controls an operation state of the fuel cell; and an acquirer that acquires a dryness degree of the fuel cell from the measured impedance when the operation state is a first operation state, and acquires the dryness degree of the fuel cell as a wet state when the operation state is a second operation state in which a water balance is more than the first operation state. 2 . The fuel cell system according to claim 1 , wherein the acquirer acquires the dryness degree as a wet state when the real part of the impedance is smaller than the reference value, and also acquires the real part on the basis of measurement by the measurer when the operation state is the first operation state, and the real part is considered to be a value that is smaller than the reference value when the operation state is the second operation state. 3 . A fuel cell system, comprising: a measurer that measures an impedance of the fuel cell; a controller that controls an operation state of the fuel cell; an acquirer that acquires a dryness degree of the fuel cell from the measured impedance when the operation state is a first operation state, and acquires the dryness degree of the fuel cell from the impedance measured by the measurer during the first operation state when the operation state is a second operation state in which a water balance is more than the first operation state. 4 . The fuel cell system according to claim 1 , wherein the second operation state is a state in which operation is performed when the temperature of the fuel cell is less than a predetermined value. 5 . The fuel cell system according to claim 1 , wherein the measurer measures the impedance using a single frequency. 6 . The fuel cell system according to claim 1 , wherein when it is acquired, by the acquirer, that the dryness degree is the dry state, the controller performs a humidification operation in which the water balance is more than the first operation state. 7 . A method of acquiring a dryness degree of a fuel cell by which the dryness degree of the fuel cell is acquired from a measured value of an impedance of the fuel cell when the operation state of the fuel cell is a first operation state, and also, the dryness degree is acquired as a wet state when the operation state is a second operation state in which a water balance is more than the first operation state. 8 . The method according to claim 7 , wherein the dryness degree is acquired as a wet state when a real part of the impedance is smaller than a reference value, and also, the real part is acquired on the basis of the measured value when the operation state is the first operation state, and the real part is considered to be a value that is smaller than the reference value when the operation state is the second operation state. 9 . The fuel cell system according to claim 3 , wherein the second operation state is a state in which operation is performed when the temperature of the fuel cell is less than a predetermined value. 10 . The fuel cell system according to claim 7 , wherein the second operation state is a state in which operation is performed when the temperature of the fuel cell is less than a predetermined value. 11 . The method according to claim 7 , wherein the impedance is measured using a single frequency. 12 . The method according to claim 7 , wherein when it is acquired that the dryness degree is a dry state, a humidification operation in which the water balance is more than the first operation state is executed. 13 . The fuel cell system according to claim 3 , wherein the measurer measures the impedance using a single frequency. 14 . The fuel cell system according claim 3 , wherein when it is acquired, by the acquirer, that the dryness degree is the dry state, the controller performs a humidification operation in which the water balance is more than the first operation state.
Humidity; Water content · CPC title
Physics · mapped topic
Physics · mapped topic
Humidifying · CPC title
Failure or abnormal function · CPC title
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