Analytic method of fuel consumption optimized hybrid concept for fuel cell systems
First Claim
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.
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Accused Products
Abstract
A method a system and method for optimizing the power distribution between a fuel cell stack and a high voltage battery in a fuel cell vehicle. The method includes 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 and 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. The virtual battery hydrogen power and the virtual stack hydrogen power are converted into polynomial equations and added together to provide a combined power polynomial equation. The combined power polynomial equation is solved to determine a minimum of the fuel cell stack power request by setting a derivative of the virtual stack hydrogen power to zero.
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Citations
18 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for optimizing a power output distribution between a fuel cell stack and a battery in a fuel cell system, said method comprising:
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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 and 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.
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11. An optimization system for optimizing a power output distribution between a fuel cell stack and a battery in a fuel cell system, said optimization system comprising:
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a controller programmed to provide; means for identifying a desired power request; means for 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; means for 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; means for converting the virtual battery hydrogen power to a battery polynomial equation; means for converting the virtual stack hydrogen power to a stack polynomial equation; means for adding the battery polynomial equation and the stack polynomial equation to obtain a combined power polynomial equation; means for solving the combined power polynomial equation to determine a minimum of the fuel cell stack power request by setting derivative of the virtual stack hydrogen power to zero; and means for subtracting the stack power request from the desired power request to obtain the battery power request; and means for 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification