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A separation membrane cartridge is configured to separate an intake air flow of an engine into a membrane flow and a bypass flow. The membrane cartridge includes a fibrous section including a plurality of fibers extending from a first end of the membrane cartridge to a second end of the membrane car

A separation membrane cartridge is configured to separate an intake air flow of an engine into a membrane flow and a bypass flow. The membrane cartridge includes a fibrous section including a plurality of fibers extending from a first end of the membrane cartridge to a second end of the membrane cartridge. The fibers are configured to separate at least a portion of the membrane flow into a permeate flow and a retentate flow. The membrane cartridge also includes a bypass passage extending from the first end to the second end to allow passage of the bypass flow through the membrane cartridge.

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1. A separation membrane cartridge configured to separate an intake air flow of an engine into a membrane flow and a bypass flow, the membrane cartridge comprising:a fibrous section including a plurality of fibers extending from a first end of the membrane cartridge to a second end of the membrane c

1. A separation membrane cartridge configured to separate an intake air flow of an engine into a membrane flow and a bypass flow, the membrane cartridge comprising:a fibrous section including a plurality of fibers extending from a first end of the membrane cartridge to a second end of the membrane cartridge, the fibers being configured to separate at least a portion of the membrane flow into a permeate flow and a retentate flow; anda bypass passage extending from the first end to the second end to allow passage of the bypass flow through the membrane cartridge. 2. The membrane cartridge of claim 1, further including a bypass flow regulator associated with the bypass passage, the bypass flow regulator being configured to control the bypass flow through the passage. 3. The membrane cartridge of claim 2, wherein the bypass flow regulator is one of an orifice plate and a flow-control valve. 4. The membrane cartridge of claim 1, wherein the bypass passage extends beyond the first and second ends of the membrane cartridge. 5. The membrane cartridge of claim 1, wherein the fibers are configured to separate at least some oxygen molecules from at least some nitrogen molecules, and wherein the oxygen molecules form a part of the permeate flow. 6. The membrane cartridge of claim 1, further including an outer wrap, the outer wrap covering a first portion of the membrane cartridge, wherein a second portion of the membrane cartridge includes a gap configured to communicate the permeate flow outside of the membrane cartridge. 7. A separation system configured to separate an intake air flow to create a desired air mixture for an engine, the system comprising:a housing having a feed port configured to receive an intake air flow and an exit port configured to output an engine flow;a separation membrane cartridge in the housing, the separation membrane cartridge being configured to separate a first portion of the intake air flow into a permeate flow and a retentate flow; anda bypass passage extending through the membrane cartridge from a first end of the membrane cartridge to a second end of the membrane cartridge to allow passage of a second portion of the intake air flow through the membrane cartridge. 8. The system of claim 7, wherein the separation membrane cartridge includes a fibrous section having a plurality of fibers extending from the first end of the membrane cartridge to the second end of the membrane cartridge, the fibers being configured to separate at least the first portion of the intake air flow into the permeate flow and the retentate flow. 9. The system of claim 7, further including a bypass flow regulator in the bypass passage, the bypass flow regulator being configured to regulate the bypass flow. 10. The system of claim 9, wherein the bypass flow regulator is one of an orifice plate and a flow-control valve. 11. The system of claim 7, further including:a permeate flow port in the housing, the permeate flow port being adapted to receive the permeate flow; anda permeate flow regulator in the permeate flow port, the permeate flow regulator being configured to regulate the permeate flow from the housing. 12. The system of claim 11, further including an isolated region between an outer surface of the membrane cartridge and the housing, the isolated region being configured to receive the permeate flow, wherein the permeate flow port is in fluid communication with the isolated region. 13. The system of claim 7, further including a flow regulator in the feed port configured to control the intake air flow into the housing. 14. The system of claim 7, wherein the membrane cartridge includes an outer wrap, the outer wrap covering a first portion of the membrane cartridge, wherein a second portion of the membrane cartridge includes a gap configured to communicate the permeate flow outside of the membrane cartridge. 15. The system of claim 7, further including a mixing region within the housing, wherein the retentate flow and the bypass flow are mixed at the mixing region to create the engine flow. 16. The system of claim 7, wherein the permeate flow is oxygen-enriched and the retentate flow is nitrogen-enriched. 17. The system of claim 7, further including an internal combustion engine having an engine intake manifold in fluid communication with the exit port. 18. A method of creating a desired air mixture for an engine, comprising:receiving an intake flow into a housing;separating a first portion of the intake flow into a permeate flow and a retentate flow;passing a second portion of the intake flow through a bypass passage extending through a membrane cartridge;mixing the retentate flow and the second portion of the intake flow to create an engine flow; andoutputting the engine flow from the housing to the engine. 19. The method of claim 18, wherein the retentate flow is a nitrogen-enriched flow and the permeate flow is an oxygen-enriched flow. 20. The method of claim 18, further including regulating the bypass flow through the bypass passage. 21. The method of claim 18, further including releasing the permeate flow from the housing. 22. The method of claim 18, further including controlling the retentate flow by controllably releasing the permeate flow from the housing.