Reactive compressor surge mitigation strategy for a fuel cell power system
First Claim
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1. A method for avoiding surge in a vehicular fuel cell system compressor, said method comprising:
- maintaining, within a memory, a compressor map corresponding to the operation of the compressor;
controlling the compressor using a default strategy such that its operation approaches a setpoint within the compressor map;
sensing a surge condition within the compressor;
determining if an operating speed of the compressor is at or above a threshold value or below the threshold value;
controlling the surge condition with a first surge mitigation strategy if the operating speed of the compressor is at or above the threshold value or a second surge mitigation strategy if the operating speed of the compressor is below the threshold value;
regulating a cathode backpressure valve with the first surge mitigation strategy; and
regulating a recirculation valve with the second mitigation strategy.
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Abstract
Systems and methods to mitigate surge conditions in a compressor of a vehicle fuel cell system. A first surge mitigation strategy regulates a cathode backpressure valve, if the compressor is operating at or above a threshold speed. A second surge mitigation strategy regulates a recirculation valve if the compressor is operating below the threshold speed. In one form, a feedback-based control may be used as part of a larger feedforward-based control strategy such that the mitigation is part of a reactive control strategy. The strategy may additionally be implemented in a processor-based controller.
15 Citations
20 Claims
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1. A method for avoiding surge in a vehicular fuel cell system compressor, said method comprising:
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maintaining, within a memory, a compressor map corresponding to the operation of the compressor; controlling the compressor using a default strategy such that its operation approaches a setpoint within the compressor map; sensing a surge condition within the compressor; determining if an operating speed of the compressor is at or above a threshold value or below the threshold value; controlling the surge condition with a first surge mitigation strategy if the operating speed of the compressor is at or above the threshold value or a second surge mitigation strategy if the operating speed of the compressor is below the threshold value; regulating a cathode backpressure valve with the first surge mitigation strategy; and regulating a recirculation valve with the second mitigation strategy. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A controller for a vehicle fuel cell system comprising:
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at least one processor; and a non-transitory memory in communication with the at least one processor, wherein the memory stores machine instructions that, when executed by the at least one processor, cause the at least one processor to; maintain a compressor map corresponding to the operation of a compressor of the vehicle fuel cell system, control the compressor using a default strategy such that its operation approaches a setpoint within the compressor map, detect the presence of a surge condition within the compressor, determine if an operating speed of the compressor is at or above a threshold value or if the speed of the compressor is below the threshold value; control the surge condition with a first surge mitigation strategy if the operating speed of the compressor is at or above the threshold value or a second surge mitigation strategy if the operating speed of the compressor is below the threshold value, regulate a cathode backpressure valve with the first surge mitigation strategy, and regulate a recirculation valve with the second mitigation strategy. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A vehicle fuel cell system comprising;
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a fuel cell stack; a compressor operatively connected to the fuel cell stack to provide compressed gas thereto; a recirculation valve operatively connected to an inlet and outlet of the compressor; a backpressure valve operatively connected to an outlet of the fuel cell stack; and a controller in communication with the recirculation valve, the compressor and the backpressure valve, the controller comprising at least one processor and a non-transitory memory in signal communication therewith such that instructions stored in the memory cause the at least one processor to; maintain a compressor map corresponding to the operation of the compressor, control the compressor using a default strategy such that the operation of the compressor approaches a setpoint within the compressor map, detect the presence of a surge condition within the compressor, determine if an operating speed of the compressor is at or above a threshold value or if the speed of the compressor is below the threshold value; control the surge condition with a first surge mitigation strategy if the operating speed of the compressor is at or above a threshold value or a second surge mitigation strategy if the operating speed of the compressor is below the threshold value, regulate a cathode backpressure valve with the first surge mitigation strategy, and regulate a recirculation valve with the second mitigation strategy. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification