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A fuel injector for delivering fuel to an internal combustion engine. The fuel injector includes a fuel injector housing, a system for metering vaporized fuel to the internal combustion engine, the system positioned within the fuel injector housing, and a system for delivering an atomized stream of

A fuel injector for delivering fuel to an internal combustion engine. The fuel injector includes a fuel injector housing, a system for metering vaporized fuel to the internal combustion engine, the system positioned within the fuel injector housing, and a system for delivering an atomized stream of liquid fuel to an internal combustion engine, the system positioned within the fuel injector housing, wherein the fuel injector is operable to transition from metering vaporized fuel to delivering an atomized stream of liquid fuel to an internal combustion engine. The system for metering vaporized fuel includes at least one capillary flow passage, the at least one capillary flow passage having an inlet end and an outlet end; a heat source arranged along the at least one capillary flow passage, the heat source operable to heat the liquid fuel in the at least one capillary flow passage to a level sufficient to change from the liquid state to a vapor state and deliver a stream of vaporized fuel from the outlet end of the at least one capillary flow passage. The system for metering vaporized fuel further includes a valve for metering vaporized fuel located downstream to the outlet end of the at least one capillary flow passage. The fuel injector is effective in reducing cold-start and warm-up emissions of an internal combustion engine.

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What is claimed is: 1. A fuel injector for delivering fuel to an internal combustion engine, comprising: (a) a fuel injector housing; (b) a system for metering vaporized fuel to the internal combustion engine, said system positioned within said fuel injector housing; and (c) a system for delivering

What is claimed is: 1. A fuel injector for delivering fuel to an internal combustion engine, comprising: (a) a fuel injector housing; (b) a system for metering vaporized fuel to the internal combustion engine, said system positioned within said fuel injector housing; and (c) a system for delivering an atomized stream of liquid fuel to an internal combustion engine, said system positioned within said fuel injector housing; wherein the fuel injector is operable to transition from metering vaporized fuel to delivering an atomized stream of liquid fuel to an internal combustion engine. 2. The fuel injector of claim 1, wherein said system for metering vaporized fuel comprises: (i) at least one capillary flow passage mounted within said fuel injector housing, said at least one capillary flow passage having an inlet end and an outlet end; and (ii) a heat source arranged along said at least one capillary flow passage, said heat source operable to heat the fuel within said at least one capillary flow passages to a level sufficient to change the fuel from a liquid state to a vapor state and deliver vaporized fuel from said outlet end of said at least one capillary flow passage. 3. The fuel injector of claim 2, wherein said system for metering vaporized fuel further comprises a valve positioned within said fuel injector housing and proximate to said outlet end of said at least one capillary flow passage. 4. The fuel injector of claim 3, wherein said valve is positioned downstream of said outlet end of said at least one capillary flow passage. 5. The fuel injector of claim 4, wherein said valve is a low-mass ball valve assembly operated by a solenoid. 6. The fuel injector of claim 5, wherein said low-mass ball valve assembly comprises a ball connected to a plate, the plate capable of moving as a result of a magnetic field created by actuation of said solenoid, and a conical sealing surface. 7. The fuel injector of claim 6, wherein said low-mass ball valve assembly further comprises a spring dimensioned to provide a spring force operable to push said ball against said conical section and block fluid flow from the injector. 8. The fuel injector of claim 7, further comprising an exit orifice, wherein movement of said plate caused by actuation of said solenoid causes said ball to be drawn away from said conical sealing surface, allowing fuel to flow through said exit orifice. 9. The fuel injector of claim 5, wherein said system for delivering an atomized stream of liquid fuel to an internal combustion engine comprises an orifice plate having a plurality of orifices. 10. The fuel injector of claim 9, wherein said valve of said system for metering vaporized fuel is operable to meter the liquid fuel when the fuel injector transitions from metering vaporized fuel to delivering an atomized stream of liquid fuel. 11. The fuel injector of claim 10, wherein said valve of said system for metering vaporized fuel is positioned upstream of said orifice plate. 12. The fuel injector of claim 2, wherein said at least one capillary flow passage is formed within a tube selected from the group consisting of stainless steel and nickel-chromium alloy. 13. The fuel injector of claim 12, wherein said at least one capillary flow passage has an internal diameter from about 0.020 to about 0.030 inches and a heated length of from about 1 to about 3 inches. 14. The fuel injector of claim 2, further comprising: (d) means for cleaning deposits formed during operation of the injector. 15. The fuel injector of claim 14, wherein said means for cleaning deposits employs a solvent comprising liquid fuel and wherein said heat source is phased-out during cleaning of said at least one capillary flow passage. 16. The fuel injector of claim 2, wherein said heat source includes a resistance heater. 17. The fuel injector of claim 1, wherein said system for delivering an atomized stream of liquid fuel to an internal combustion engine comprises an orifice plate having a plurality of orifices. 18. The fuel injector of claim 1, wherein the internal combustion engine is an alcohol-fueled engine. 19. The fuel injector of claim 1, wherein the internal combustion engine is a gasoline direct-injection engine. 20. The fuel injector of claim 1, wherein the internal combustion engine is part of a hybrid-electric vehicle. 21. The fuel injector of claim 1, further comprising: (d) means for cleaning deposits formed during operation of the injector. 22. The fuel injector of claim 21, wherein said means for cleaning deposits employs a solvent comprising liquid fuel from the liquid fuel source and wherein the heat source is phased-out during cleaning of said at least one capillary flow passage. 23. A fuel injector for vaporizing and metering a liquid fuel to an internal combustion engine, comprising: (a) at least one capillary flow passage, said at least one capillary flow passage having an inlet end and an outlet end; (b) a heat source arranged along said at least one capillary flow passage, said heat source operable to heat the liquid fuel in said at least one capillary flow passages to a level sufficient to change from the liquid state to a vapor state and deliver vaporized fuel from said outlet end of said at least one capillary flow passage; and (c) a valve for metering vaporized fuel to the internal combustion engine, said valve located proximate to said outlet end of said at least one capillary flow passage. 24. The fuel injector of claim 23, wherein said valve for metering fuel to the internal combustion engine is a low-mass ball valve assembly operated by a solenoid. 25. The fuel injector of claim 23, wherein said at least one capillary flow passage is formed within a tube selected from the group consisting of stainless steel and nickel-chromium alloy. 26. The fuel injector of claim 25, wherein said at least one capillary flow passage has an internal diameter from about 0.020 to about 0.030 inches and a heated length of from about 1 to about 3 inches. 27. The fuel injector of claim 23, wherein said heat source includes a resistance heater. 28. The fuel injector of claim 23, wherein said valve for metering fuel to the internal combustion engine is positioned downstream of said outlet end of said at least one capillary flow passage. 29. The fuel injector of claim 23, whereby the stream of vaporized fuel from said outlet end of said at least one capillary flow passage is introduced upstream of said valve for metering fuel. 30. A fuel system for use in an internal combustion engine, comprising: (a) a plurality of fuel injectors, each of said plurality of fuel injectors having an inlet and an outlet and including (i) a fuel injector housing; (ii) a system for metering vaporized fuel to the internal combustion engine, said system positioned within said fuel injector housing; and (iii) a system for delivering an atomized stream of liquid fuel to an internal combustion engine, said system positioned within said fuel injector housing; (b) a liquid fuel supply system in fluid communication with said plurality of fuel injectors; and (c) a controller in electronic communication with the plurality of fuel injectors and adapted to select delivery of vaporized fuel or liquid fuel from said plurality of fuel injectors. 31. The fuel system of claim 30, wherein said system for metering vaporized fuel comprises: (1) at least one capillary flow passage mounted within said fuel injector housing, said at least one flow passage having an inlet end and an outlet end; and (2) a heat source arranged along said at least one capillary flow passage, said heat source operable to heat the fuel within said at least one capillary flow passage to a level sufficient to change the fuel from a liquid state to a vapor state and deliver vaporized fuel from said outlet end of said at least one capillary flow passage. 32. The fuel system of claim 31, wherein said system for metering vaporized fuel further comprises a valve positioned within said fuel injector housing and proximate to said outlet end of said at least one capillary flow passage. 33. The fuel system of claim 32, wherein said valve is positioned downstream of said outlet end of said at least one capillary flow passage. 34. The fuel system of claim 33, wherein said valve is a low-mass ball valve assembly operated by a solenoid. 35. The fuel system of claim 34, wherein said system for delivering an atomized stream of liquid fuel to an internal combustion engine comprises an orifice plate having a plurality of orifices. 36. The fuel system of claim 35, wherein said valve of said system for metering vaporized fuel is operable to meter the liquid fuel when said controller selects delivery of atomized liquid fuel. 37. The fuel system of claim 36, wherein said at least one capillary flow passage has an internal diameter from about 0.020 to about 0.030 inches and a heated length of from about 1 to about 3 inches. 38. The fuel system of claim 31, further comprising: (d) means for cleaning deposits formed during operation of the injector. 39. The fuel system of claim 38, wherein said means for cleaning deposits employs a solvent comprising liquid fuel and wherein said heat source is phased-out during cleaning of said at least one capillary flow passage. 40. The fuel system of claim 31, wherein said heat source includes a resistance heater. 41. The fuel system injector of claim 30, wherein said system for delivering an atomized stream of liquid fuel to an internal combustion engine comprises an orifice plate having a plurality of orifices. 42. The fuel system injector of claim 30, wherein the internal combustion engine is an alcohol-fueled engine. 43. The fuel system injector of claim 30, wherein the internal combustion engine is a gasoline direct-injection engine. 44. The fuel system of claim 30, wherein the internal combustion engine is part of a hybrid-electric vehicle. 45. The automobile of claim 33, wherein said valve is a low-mass ball valve assembly operated by a solenoid. 46. A fuel system for use in an internal combustion engine, comprising (a) a plurality of fuel injectors, each injector including (i) at least one capillary flow passage, each of said at least one capillary flow passage having an inlet end and an outlet end; (ii) a heat source arranged along said at least one capillary flow passage, said heat source operable to heat the liquid fuel in said at least one capillary flow passage to a level sufficient to change from the liquid state to a vapor state and deliver a stream of vaporized fuel from said outlet end of said at least one capillary flow passage; and (iii) a valve for metering vaporized fuel to the internal combustion engine, said valve located proximate to said outlet end of said at least one capillary flow passage; (b) a liquid fuel supply system in fluid communication with said plurality of fuel injectors; and (c) a controller to control the supply of fuel to said plurality of fuel injectors. 47. The fuel system of claim 46, wherein said valve for metering fuel to the internal combustion engine is a low-mass ball valve assembly operated by a solenoid. 48. The fuel system of claim 47, wherein said low-mass ball valve assembly comprises a ball connected to a plate, the plate capable of moving as a result of a magnetic field created by actuation of said solenoid and a conical sealing surface. 49. The fuel system of claim 48, wherein said at least one capillary flow passage is formed within a tube selected from the group consisting of stainless steel and nickel-chromium alloy. 50. The fuel system of claim 46, further comprising: (d) means for cleaning deposits formed during operation of the injector. 51. The fuel system of claim 50, wherein said means for cleaning deposits employs a solvent comprising liquid fuel from the liquid fuel source and wherein the heat source is phased-out during cleaning of said capillary flow passage. 52. A method of delivering fuel to an internal combustion engine, comprising the steps of: (a) supplying liquid fuel to at least one capillary flow passage of a fuel injector; (b) causing vaporized fuel to pass through an outlet of the at least one capillary flow passage by heating the liquid fuel in the at least one capillary flow passage; and (c) metering the vaporized fuel to the internal combustion engine through a valve located proximate to said outlet of the at least one capillary flow passage. 53. The method of claim 52, wherein said steps of causing vaporized fuel to pass through an outlet of the at least one capillary flow passage and of metering the vaporized fuel to the internal combustion engine is limited to start-up and warm-up of the internal combustion engine. 54. The method of claim 53, further comprising delivering liquid fuel to the internal combustion engine when the internal combustion engine reaches a fully warmed condition. 55. The method of claim 54, further comprising the step of monitoring at least one signal indicative of the degree of engine warm-up. 56. The method of claim 55, further comprising the step of controlling a transition from metering vaporized fuel to the delivery of liquid fuel through the use of a controller in electronic communication with the fuel injector based on the monitoring of the at least one signal indicative of the degree of engine warm-up. 57. The method of claim 54, wherein the step of delivering liquid fuel to the internal combustion engine includes the step of atomizing a stream of liquid fuel. 58. The method of claim 57, wherein the step of atomizing a stream of liquid fuel employs an orifice plate having a plurality of orifices. 59. The method of claim 58, further comprising cleaning periodically the at least one capillary flow passage. 60. The method of claim 59, wherein said periodic cleaning comprises (i) phasing-out said heating of the plurality of capillary flow passages, (ii) supplying a solvent to the at least one capillary flow passage, whereby deposits formed in the at least one capillary flow passage are substantially removed. 61. The method of claim 60, wherein the solvent includes liquid fuel from the liquid fuel source. 62. The method of claim 52, wherein the vaporized fuel mixes with air and forms an aerosol prior to combustion, the method including forming the aerosol with a particle size distribution, a fraction of which is 25 μm or less prior to igniting the vaporized fuel to initiate combustion. 63. The method of claim 52, wherein in step (c) the valve for metering fuel to the internal combustion engine is a low-mass ball valve assembly operated by a solenoid. 64. The method of claim 52, wherein each of the at least one capillary flow passage is formed within a tube selected from the group consisting of stainless steel and nickel-chromium alloy. 65. The method of claim 62, wherein the at least one capillary flow passage has an internal diameter of from about 0.020 to about 0.030 inches and a heated length of from about 1 to about 3 inches. 66. The method of claim 52, wherein in step (b) said heating is achieved through the use of a resistance heater. 67. The method of claim 52, wherein in step (c) the valve for metering fuel to the internal combustion engine is positioned downstream of the outlet of the at least one capillary flow passage. 68. The method of claim 52, whereby the vaporized fuel is introduced upstream of the valve for metering fuel. 69. The method of claim 52, wherein the internal combustion engine is an alcohol-fueled engine. 70. The method of claim 52, wherein the internal combustion engine is a gasoline direct-injection engine. 71. The method of claim 52, wherein the internal combustion engine is part of a hybrid-electric vehicle. 72. An automobile, comprising: (a) an internal combustion engine positioned within a body; and (b) a fuel system for fueling said internal combustion engine, said fuel system including: (i) a plurality of fuel injectors, each of said plurality of fuel injectors having an inlet and an outlet and including (1) a fuel injector housing; (2) a system for metering vaporized fuel to the internal combustion engine, said system positioned within said fuel injector housing; and (3) a system for delivering an atomized stream of liquid fuel to an internal combustion engine, said system positioned within said fuel injector housing; (ii) a liquid fuel supply system in fluid communication with said plurality of fuel injectors; and (iii) a controller in electronic communication with the plurality of fuel injectors and adapted to select delivery of vaporized fuel or liquid fuel from said plurality of fuel injectors. 73. The automobile of claim 72, wherein said system for metering vaporized fuel comprises: (2i) a plurality of capillary flow passages mounted within said fuel injector housing, each of said plurality of flow passages having an inlet end and an outlet end; and (2ii) a heat source arranged along each of said plurality of capillary flow passages, said heat source operable to heat the fuel within each of said plurality of capillary flow passages to a level sufficient to change the fuel from a liquid state to a vapor state and deliver vaporized fuel from each said outlet end of said plurality of capillary flow passages. 74. The automobile of claim 73, wherein said system for metering vaporized fuel further comprises a valve positioned within said fuel injector housing and proximate to each said outlet end of said plurality of capillary flow passages. 75. The automobile of claim 74, wherein said valve is positioned downstream of each said outlet end of said plurality of capillary flow passages.