POWER CONTROL FOR HYBRID FUEL CELL SYSTEMS
First Claim
1. A hybrid fuel cell system comprising:
- a fuel cell stack;
a power source; and
a controller sub-system including a cell voltage controller, a damped driver power request controller and a power balancing and limiting controller, said cell voltage controller including a first look-up table responsive to a power source state of charge signal and providing a cell voltage set-point signal based on the state of charge of the power source, said cell voltage controller further including a subtractor for subtracting the cell voltage set-point signal from an actual cell voltage signal, said cell voltage controller further including a proportional controller responsive to the subtracted signal and providing a proportional cell voltage gain signal, said damped driver power request controller receiving the state of charge signal and a driver power request signal, said damped driver power request controller including a filter that damps the driver power request signal based on the state of charge signal, said controller sub-system adding the damped power request signal and the gain signal, said power balancing and limiting controller being responsive to the added power request and gain signal and the driver power request signal, and setting a power demand signal for the stack and the power source.
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Accused Products
Abstract
A hybrid fuel cell system that includes a fuel cell stack and a high voltage battery. The fuel cell system also includes a cell voltage controller that controls the average cell voltage of the cells in the fuel cell stack, a damped driver request module that damps a driver power request signal, and a power balancing module. The power balancing module maintains the cell voltage of the cells in the stack within a predetermined range, and uses excess power from the stack beyond what is requested to charge the battery. The power balancing module includes a base load limiter that prevents the cell voltage from going above a predetermined value, unless the battery is at is maximum state of charge.
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Citations
20 Claims
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1. A hybrid fuel cell system comprising:
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a fuel cell stack; a power source; and a controller sub-system including a cell voltage controller, a damped driver power request controller and a power balancing and limiting controller, said cell voltage controller including a first look-up table responsive to a power source state of charge signal and providing a cell voltage set-point signal based on the state of charge of the power source, said cell voltage controller further including a subtractor for subtracting the cell voltage set-point signal from an actual cell voltage signal, said cell voltage controller further including a proportional controller responsive to the subtracted signal and providing a proportional cell voltage gain signal, said damped driver power request controller receiving the state of charge signal and a driver power request signal, said damped driver power request controller including a filter that damps the driver power request signal based on the state of charge signal, said controller sub-system adding the damped power request signal and the gain signal, said power balancing and limiting controller being responsive to the added power request and gain signal and the driver power request signal, and setting a power demand signal for the stack and the power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 20)
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9. A fuel cell system comprising:
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a fuel cell stack; a battery; and a controller sub-system for controlling a power demand signal for the stack and the battery so as to maintain the average cell voltage of the stack within a predetermined range, said controller sub-system damping a driver power request, and using excess power to recharge the battery. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for controlling the power distribution between a fuel cell stack and a battery in a hybrid fuel cell system, said method comprising:
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providing a cell voltage set-point signal based on the state of charge of the battery; damping a driver power request signal based on the state of charge of the battery; adding the cell voltage set-point signal and the damped power request signal; and balancing the power distribution between the stack and the battery based on the added cell voltage set-point signal and the damped signal and the driver power request signal. - View Dependent Claims (17, 18, 19)
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Specification