METHOD AND APPARATUS FOR DIAGNOSING FAULT WITHIN FUEL CELL STACK

摘要

To diagnose a fault of a fuel cell stack, an alternating current having a first optimal frequency of a first frequency domain to diagnose a drop in cell voltage and an alternating current having a second optimal frequency of a second frequency domain to diagnose a cause of the drop in cell voltage are supplied to the fuel cell stack are provided. A distortion rate is then calculated based on voltage of the fuel cell stack according to the alternating current of the first optimal frequency, and the drop in cell voltage is diagnosed based on the calculated distortion rate. Also, impedance is calculated based on voltage and a current of the fuel cell stack according to the alternating current of the second optimal frequency and amount of water is calculated based on the calculated in the fuel cell stack, and the cause of the drop in cell voltage is diagnosed based on the calculated impedance and amount of water.

主权项

1. A method of diagnosing a fault of a fuel cell stack, the method comprising:
supplying, to the fuel cell stack, a plurality of alternating currents having different frequency combinations by an alternating current (AC) current generator; measuring, by a processor, a distortion rate and impedance of the fuel cell stack for each alternating current, and selecting an optimal frequency based on the measured distortion rate and impedance; supplying, to the fuel cell stack, an alternating current having the selected optimal frequency by the AC current generator; calculating, by the processor, the distortion rate of the fuel cell stack according to the alternating current having the optimal frequency, and diagnosing a drop in cell voltage based on the calculated distortion rate; and calculating, by the processor, the impedance of the fuel cell stack according to the alternating current having the optimal frequency, amount of water in the fuel cell stack based on the calculated impedance, and diagnosing a cause of the drop in cell voltage based on the calculated impedance and amount of water.