Patent ID: 7285344
Filing Date: 2007-10-23
Classification: H01M,Y02E

Abstract:
1. A fuel cell control system for controlling a fuel cell stack constructed by a plurality of individual cells each of which generates an electric power by an electrochemical reaction of hydrogen and oxygen, said fuel cell control system comprising: output voltage measuring means for measuring output voltages of all or a part of said individual cells; and diagnosing means for diagnosing said fuel cell stack on the basis of the measured output voltages and their statistics, and for diagnosing at least whether or not an amount of water involved in said fuel cell stack is excessive based on said output voltage and an average voltage of said output voltages, wherein said operation of said fuel cell control system is controlled according to said diagnosis result of said diagnosing means, and wherein said fuel cell control system calculates the average voltage based on the output voltage of each individual cell measured by the output voltage measuring means and a standard deviation of the output voltages of said individual cells, and wherein said fuel cell control system causes the amount of water in said fuel cell stack to increase when the average voltage exceeds a predetermined voltage and the standard deviation is within a predetermined range, and causes the amount of hydrogen supplied to said fuel cell stack to increase when the average voltage exceeds the predetermined voltage and the standard deviation is out of the predetermined range.