Hybrid power system for an electric vehicle
First Claim
1. A hybrid power system for supplying power to a load, comprising:
- an energy storage device; and
, a fuel cell system wherein said energy storage device supplies all of said power when a state of charge of said energy storage device is greater than a first predetermined state of charge and said fuel cell system provides at least a portion of said power when said state of charge of said energy storage device is less than or equal to said first predetermined state of charge.
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Accused Products
Abstract
A hybrid power system (10) for supplying power to a load (12) such as an electric vehicle is provided. The power system (10) includes an energy storage device (14) and a fuel cell system (16). When the state of charge of the energy storage device (14) is greater than or equal to a predetermined state of charge, the energy storage device (14) supplies all of the power to the load (12). When the state of charge of the energy storage device (14) falls below the predetermined state of charge, the fuel cell system (16) supplies at least a portion of the power to the load (12). In accordance with one aspect of the invention, the fuel cell system (16) then supplies all of the power to the load (12) as long as the power requirement of the load (12) does not exceed an optimal power output of the fuel cell system (16).
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Citations
20 Claims
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1. A hybrid power system for supplying power to a load, comprising:
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an energy storage device; and
,a fuel cell system wherein said energy storage device supplies all of said power when a state of charge of said energy storage device is greater than a first predetermined state of charge and said fuel cell system provides at least a portion of said power when said state of charge of said energy storage device is less than or equal to said first predetermined state of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A hybrid power system for supplying power to a load, comprising:
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an energy storage device; and
,a fuel cell system wherein said energy storage device supplies all of said power when a state of charge of said energy storage device is greater than a first predetermined state of charge, said fuel cell system supplies all of said power when said state of charge of said storage device is less than or equal to said first predetermined state of charge and a power requirement of said load is less than or equal to an optimal power output of said fuel cell system, and said energy storage device and said fuel cell both supply said power when said state of charge of said energy storage device is less than or equal to said first predetermined state of charge and said power requirement of said load is greater than said optimal power output of said fuel cell system. - View Dependent Claims (10, 11, 12, 13)
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14. A method of supplying power to a load, comprising the steps of:
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providing an energy storage device and a fuel cell system; and
,controlling said energy storage device and said fuel cell system wherein said energy storage device supplies all of said power when a state of charge of said energy storage device is greater than a first predetermined state of charge and said fuel cell system provides at least a portion of said power when said state of charge of said energy storage device is less than or equal to said first predetermined state of charge. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification