Method and system to determine state-of-health of a fuel cell using an intelligent system
First Claim
1. A method of determining a state-of-health of a fuel cell stack connected to a load, comprising:
- detecting an impedance characteristic Z1 of the fuel cell stack at a selected frequency;
detecting a voltage V1 of the fuel cell stack at open circuit;
detecting a voltage V2 of the fuel cell stack when the maximum load current is being drawn from said fuel cell stack; and
determining said state-of-health of said fuel cell stack from a fuzzy system trained in a relationship between said impedance characteristic Z1, said voltage V1 of the fuel cell stack at open circuit, and said voltage V2 of the fuel cell stack when a maximum load current is being drawn from said fuel cell stack.
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Abstract
A method of and system for determining the state-of-health of a proton exchange membrane fuel cell stack connected to a load comprises detecting the real part of the impedance Z1 of the fuel cell stack at a selected frequency; detecting the voltage V1 of the fuel cell stack at open circuit; detecting the voltage V2 of the fuel cell stack when the maximum load current is being drawn from said fuel cell stack; and determining the state of health of said fuel cell stack from a fuzzy system trained in a relationship between said real part of the impedance of the fuel cell stack at the selected frequency, the voltage of the fuel cell stack at open circuit, and the voltage of the fuel cell stack when the maximum load current is being drawn from said fuel cell stack.
70 Citations
15 Claims
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1. A method of determining a state-of-health of a fuel cell stack connected to a load, comprising:
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detecting an impedance characteristic Z1 of the fuel cell stack at a selected frequency;
detecting a voltage V1 of the fuel cell stack at open circuit;
detecting a voltage V2 of the fuel cell stack when the maximum load current is being drawn from said fuel cell stack; and
determining said state-of-health of said fuel cell stack from a fuzzy system trained in a relationship between said impedance characteristic Z1, said voltage V1 of the fuel cell stack at open circuit, and said voltage V2 of the fuel cell stack when a maximum load current is being drawn from said fuel cell stack. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for detecting a state-of-health of a fuel cell stack comprising:
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a microcontroller adapted to receive inputs from an impedance measurement device and a voltage measurement device, the microcontroller including software causing the microcontroller to;
store an impedance value corresponding to an impedance characteristic of the fuel cell stack at a selected frequency, a first voltage value of the fuel cell stack when a circuit including the fuel cell stack is open, and a second voltage value of the fuel cell stack when the fuel cell stack is under a maximum load;
calculate a sum of the first and second voltage values;
calculate a difference of the first and second voltage values;
input the impedance value and the sum and the difference of the first and second voltage values into a fuzzy system trained in a relation of the impedance value and the sum and the difference of the first and second voltage values and the state-of-health of the fuel cell stack; and
store the state of health of the fuel cell stack output from the fuzzy system. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification