초록 ▼

A method for controlling the current output from a fuel cell stack to prevent the stack voltage or the minimum fuel cell voltage from dropping below predetermined voltage set-points. The method for the stack voltage control includes determining whether the stack voltage has dropped to the predetermi

A method for controlling the current output from a fuel cell stack to prevent the stack voltage or the minimum fuel cell voltage from dropping below predetermined voltage set-points. The method for the stack voltage control includes determining whether the stack voltage has dropped to the predetermined voltage set-point, and if so, capturing and holding the actual stack current at that point as the maximum allowed stack current. If the stack voltage continues to fall below the voltage set-point, then the voltage set-point is subtracted from the actual voltage to get a positive error signal. Controller gains are then multiplied by the error signal to reduce the current allowed from the stack to drive the error signal to zero, and increase the stack voltage. The method for the minimum fuel cell voltage operates in the same manner, but with different values.

대표청구항 ▼

What is claimed is: 1. A method for reducing and controlling the current output from a fuel cell stack in response to an output voltage of the fuel cell stack dropping to a predetermined stack voltage set-point, said method comprising:determining whether the stack voltage has dropped to the predeter

What is claimed is: 1. A method for reducing and controlling the current output from a fuel cell stack in response to an output voltage of the fuel cell stack dropping to a predetermined stack voltage set-point, said method comprising:determining whether the stack voltage has dropped to the predetermined voltage set-point;holding the current output that is being drawn from the fuel cell stack when the voltage drops to the voltage set-point as a maximum stack current output allowed from the fuel cell stack;determining whether the stack voltage has dropped below the stack voltage set-point;subtracting the stack voltage set-point from the actual stack voltage to get a first positive error signal if the stack voltage has dropped below the voltage set-point; andmultiplying the error signal by at least one gain signal so as to reduce the maximum stack current output allowed from the fuel cell stack and drive the first positive error signal to zero.