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An engine includes a compressor, and combustor, and an expander. The compressor compresses ambient air. The combustor burns the compressed air, and produces exhaust gasses. The expander receives the exhaust gases from the combustor, and expands the exhaust gasses. The compressor may be a gerotor com

An engine includes a compressor, and combustor, and an expander. The compressor compresses ambient air. The combustor burns the compressed air, and produces exhaust gasses. The expander receives the exhaust gases from the combustor, and expands the exhaust gasses. The compressor may be a gerotor compressor or a piston compressor having variable-dead-volume control. The expander may be a gerotor expander or a piston expander having variable-dead-volume control. Moreover, the engine may include a regenerative brake. The regenerative brake may include one or more valves coupled to the compressor, an expander clutch, and a compressor clutch. Specifically, during braking, the expander clutch is disengaged and the compressor clutch is engaged.

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1. An engine comprising:a compressor for compressing ambient air; a combustor for burning said compressed air, said combustor producing exhaust gasses; and an expander for receiving said exhaust gases from said combustor and expanding said exhaust gasses; wherein said compressor is a gerotor compres

1. An engine comprising:a compressor for compressing ambient air; a combustor for burning said compressed air, said combustor producing exhaust gasses; and an expander for receiving said exhaust gases from said combustor and expanding said exhaust gasses; wherein said compressor is a gerotor compressor, and wherein said engine further comprises variable compression-ratio control means for achieving a reduced compression ratio by enlarging a discharge port in a valve plate of said gerotor compressor and an inlet port of said expander. 2. The engine of claim 1, further comprising a heat exchanger for exchanging heat between said compressed air and said exhaust gasses.3. The engine of claim 2, wherein said heat exchanger is a spinning-wheel heat regenerator.4. The engine of claim 1, further comprising a spraying means for spraying said air with a liquid prior to compression.5. The engine of claim 1, wherein said combustor is a tubular combustor.6. The engine of claim 1, further comprising an igniter, wherein said igniter is selected from the group consisting of a spark plug and a rail gun spark plug.7. The engine of claim 6, wherein said igniter fires continuously.8. The engine of claim 6, wherein said igniter fires periodically.9. The engine of claim 6, wherein said combustor comprises a resistance heater.10. The engine of claim 1, further comprising:a pressure tank for receiving and storing said compressed air from said compressor. 11. The engine of claim 1, wherein said engine is mobile.12. The engine of claim 1, wherein said engine is stationary.13. The engine of claim 1, wherein said engine is a Brayton Cycle engine.14. The engine of claim 13, wherein said Brayton Cycle is quasi-isothermal.15. The engine of claim 1, wherein said expander is selected from the group consisting of a gerotor expander, in which a shape of an inlet port of said gerotor expander is changed using said variable-compression ratio control means, and a piston expander having variable-dead-volume control.16. An engine comprising:a compressor for compressing ambient air; a combustor for burning said compressed air, said combustor producing exhaust gasses; and an expander for receiving said exhaust gases from said combustor and expanding said exhaust gasses; wherein said expander is a gerotor expander, and wherein said engine further comprises variable compression-ratio control means for achieving an increased compression ratio by shrinking an inlet port in a valve plate of said gerotor expander and a discharge port of said compressor. 17. The engine of claim 16, further comprising a heat exchanger for exchanging heat between said compressed air and said exhaust gasses.18. The engine of claim 17, wherein said heat exchanger is a spinning-wheel heat regenerator.19. The engine of claim 16, further comprising a spraying means for spraying said air with a liquid prior to compression.20. The engine of claim 16, wherein said combustor is a tubular combustor.21. The engine of claim 16, further comprising an igniter, wherein said igniter is selected from the group consisting of a spark plug and a rail gun spark plug.22. The engine of claim 21, wherein said igniter fires continuously.23. The engine of claim 21, wherein said igniter fires periodically.24. The engine of claim 21, wherein said combustor comprises a resistance heater.25. The engine of claim 16, further comprising:a pressure tank for receiving and storing said compressed air from said compressor. 26. The engine of claim 16, wherein said engine is mobile.27. The engine of claim 16, wherein said engine is stationary.28. The engine of claim 16, wherein said engine is a Brayton Cycle engine.29. The engine of claim 28, wherein said Brayton Cycle is quasi-isothermal.30. The engine of claim 16, wherein said compressor is selected from the group consisting of a gerotor compressor, in which a shape of said discharge port of said gerotor compressor is changed using said variable-compression-ratio control means, and a piston compressor having variable-dead-volume control.31. An engine comprising:a piston compressor for compressing ambient air; a combustor for burning said compressed air, said combustor producing exhaust gasses; a piston expander for receiving said exhaust gases from said combustor and expanding said exhaust gasses; a pressure tank for receiving and storing said compressed air from said compressor, and at least one variable-dead-volume devices in each of said expander and said compressor, which alter a compression ratio of said engine by increasing or decreasing a dead volume in each said expander and said compressor. 32. The engine of claim 31, further comprising a heat exchanger for exchanging heat between said compressed air and said exhaust gasses.33. The engine of claim 32, wherein said heat exchanger is a spinning-wheel heat regenerator.34. The engine of claim 31, further comprising a spraying means for spraying said air with a liquid prior to compression.35. The engine of claim 31, wherein said combustor is a tubular combustor.36. The engine of claim 31, further comprising an igniter, wherein said igniter is selected from the group consisting of a spark plug and a rail gun spark plug.37. The engine of claim 36, wherein said igniter fires continuously.38. The engine of claim 36, wherein said igniter fires periodically.39. The engine of claim 36, wherein said combustor comprises a resistance heater.40. The engine of claim 31, wherein said engine is mobile.41. An engine comprising:a compressor for compressing ambient air; a combustor for burning said compressed air, said combustor producing exhaust gases; an expander for receiving said exhaust gases from said combustor and expanding said exhaust gases; and a regenerative brake comprising: a pressure tank wherein said pressure tank stores said compressed air during braking and releases said compressed air during acceleration from a stopped position; at least one valve coupled to said compressor; at least one valve coupled to said expander; at least one valve coupled to said pressure tank; an expander clutch; and a compressor clutch, wherein during braking said expander clutch is disengaged and said compressor clutch is engaged, and during acceleration said expander clutch is engaged and said compressor clutch is disengaged. 42. The engine of claim 41, wherein said compressor is selected from the group consisting of a gerotor compressor and a piston compressor having variable-dead-volume control.43. The engine of claim 41, wherein said expander is selected from the group consisting of a gerotor expander and a piston expander having variable-dead-volume control.44. An engine comprising:a compressor for compressing ambient air, wherein said compressor is a gerotor compressor, in which a shape of an inlet port of said gerotor compressor is changed using variable-compression-ratio control; a combustor for burning said compressed air, said combustor producing exhaust gases; an expander for receiving said exhaust gases from said combustor and expanding said exhaust gases; and an igniter selected from the group consisting of a spark plug and a rail gun spark plug, wherein said igniter fires in a manner selected from the group consisting of continuously and periodically; wherein said engine further comprises variable compression-ratio control means for altering a compression ratio by concordant adjustments to sizes of an inlet port of said expander and a discharge port in a valve plate of said compressor. 45. The engine of claim 44, wherein said expander is selected from the group consisting of a gerotor expander, in which a shape of an inlet port of said gerotor expander is changed using said variable-compression ratio control means, and a piston expander having variable-dead-volume control.46. An engine comprising:a compressor for compressing ambient air; a combustor for burning said compressed air, said combustor producing exhaust gases; an expander for receiving said exhaust gases from said combustor and expanding said exhaust gases, wherein said expander is a gerotor expander, in which a shape of an inlet port of said gerotor expander is changed using variable-compression ratio control; and an igniter selected from the group consisting of a spark plug and a rail gun spark plug, wherein said igniter fires a manner selected from the group consisting of continuously and periodically; wherein said engine further comprises variable compression-ratio control means for achieving a compression ratio by concordant adjustments to sizes of an inlet port in a valve plate of said expander and a discharge port of said compressor. 47. The engine of claim 46, wherein said compressor is selected from the group consisting of a gerotor compressor, in which a shape of said discharge port of said gerotor compressor is changed using said variable-compression-ratio control means, and a piston compressor having variable-dead-volume control.