Patent ID: 9020799
Filing Date: 2015-04-28
Classification: B60L,F02D,G05B,G06F,G16Z,H01M,Y02E,Y02T

Abstract:
1. A method for optimizing a power output distribution between a fuel cell stack and a battery in a fuel cell system, said method comprising: identifying a desired power request; defining a virtual battery hydrogen power for the battery that is based on a relationship between a battery power request from the battery and an efficiency of the battery; defining a virtual stack hydrogen power for the fuel cell stack that is based on a relationship between a stack power request from the fuel cell stack and an efficiency of the fuel cell stack; converting the virtual battery hydrogen power to a battery polynomial equation; converting the virtual stack hydrogen power to a stack polynomial equation; adding the battery polynomial equation and the stack polynomial equation to obtain a combined power polynomial equation; solving the combined power polynomial equation to determine a minimum of the stack power request by setting a derivative of the virtual stack hydrogen power to zero; subtracting the stack power request from the desired power request to obtain the battery power request; and adding a compressor acceleration power signal for controlling a cathode compressor to the desired power request if a stack power at a current time step is greater than a stack power at a previous time step.