Microcombustion engine/generator

• US 6,276,313 B1
• Filed: 12/30/1999
• Issued: 08/21/2001
• Est. Priority Date: 12/30/1999
• Status: Expired due to Fees

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Bonne, Ulrich, Yang, Wei, Johnson, Burgess R.
• Primary Examiner(s): Kamen, Noah P.
• Application Number:
  US09/476,931
• Time in Patent Office: 600 Days
• Field of Search: 123/46.E
• US Class Current: 123/46.00E
• CPC Class Codes: F02B 1/12 with compression ignition with fuel-air charge ignited by compression ignition of an additional fuel F02B7/00
• CPC Class Codes: F02B 63/041 Linear electric generators
• CPC Class Codes: F02B 71/04 Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
• CPC Class Codes: F02B 75/34 Ultra-small engines, e.g. for driving models
• CPC Class Codes: F02G 2250/31 Nano- or microengines

Abstract

A knocking-based, micro-combustion engine constructed in three layers of micromachined material. Two outer layers contain means for directing gases and fuels into and out of vents in a middle layer. The middle layer has machined in it two, linear, free pistons with or without integral air springs, and vents for directing gases and fuels into and out of a combustion chamber. A high compression ratio is achieved. The engine can be constructed with means to generate electrical energy.

Claims

1. A microcombustion engine comprising:

a substantially planar inner layer attached on opposing surfaces thereof to a pair of substantially, planar outer layers;

a chamber formed in said inner layer;

a first piston situated in said chamber;

a second piston situated in said chamber;

at least one intake port in said chamber;

at least one output port in said chamber; and

wherein said first and second pistons are moveable towards each other so as to compress and ignite a fuel so that the force of combustion causes said first and second pistons to move away from each other, resulting in a product of combustion leaving said chamber through said at least one output port and another fuel to enter said chamber through said at least one intake port to be compressed and ignited by said first and second pistons so that the force of combustion causes said first and second pistons to move away from each other.

2. The engine of claim 1, further comprising:

a first electromagnet proximate to said first piston;

a second electromagnet proximate to said second piston;

wherein said first and second electromagnets convert kinetic energy from said first and second pistons, respectively, into electrical energy.

3. The engine of claim 2, wherein said first and second electromagnets drive said pistons into resonance, generate electricity and synchronize said first and second pistons.

4. The engine of claim 3, wherein said chamber and first and second pistons are micromachined from at least one material from a group consisting of silicon, ceramic, sapphire, silicon carbide, Pyrex and metal.

28. The engine of claim 1 which has a length of about 1 millimeter or less.

5. A microcombustion engine comprising:

a substantially planar inner layer attached on opposing surfaces thereof to a pair of substantially planar outer layers;

a chamber formed in said inner layer;

a first piston situated in said chamber;

a second piston situated in said chamber;

a first detector proximate to said first piston;

a second detector proximate to said second piston;

a first transducer proximate to said first piston; and

a second transducer proximate to said second piston.

6. The engine of claim 5, wherein said chamber, and said first and second pistons are micromachined.

7. The engine of claim 6, wherein said first and second pistons may move towards each other in said chamber of compress a fuel to result in a homogeneous auto ignition of the fuel mixture into a combustion.

8. The engine of claim 7, further comprising;

an input port situated in said chamber; and

an exhaust port situated in said chamber.

9. The engine of claim 8, wherein:

said first and second pistons are moved away from each other by the combustion;

such that the products of the combustion exit said chamber via said exhaust port; and

the fuel enters said chamber via said input port.

10. The engine of claim 9, wherein:

said first detector senses a position of said first piston within said chamber;

said second detector senses a position of said second piston within said chamber;

said first transducer occasionally exerts a force upon said first piston;

said second transducer occasionally exerts a force on said second piston; and

the forces exerted on said first and second pistons tend to keep said first and second pistons synchronized.

11. The engine of claim 10, wherein:

said first transducer converts kinetic energy of said first piston into electrical energy; and

said second transducer converts kinetic energy of said second piston into electrical energy.

12. The engine of claim 11 , wherein:

said first transducer is an electromagnet; and

said second transducer is an electromagnet.

13. The engine of claim 12, wherein:

said chamber is micromachined from a material; and

said first and second pistons are micromachined from the material.

14. The engine of claim 13, wherein the material is from a group consisting of silicon, ceramic, sapphire, silicon carbide, Pyrex and metal.

15. The engine of claim 14, wherein:

said first and second pistons have first ends facing each other and permanent magnets attached to their second ends; and

said first and second electromagnets are said first and second detectors, respectively.

16. A microcombustion engine comprising:

a substantially planar inner layer attached on opposing surfaces thereof to a pair of substantially planar outer layers;

a chamber formed in said inner layer;

a first piston situated in said chamber and freely moveable along a length of said chamber;

a second piston situated in said chamber and freely moveable along the length of said chamber; and

a vent situated in said chamber; and

wherein said chamber, first piston, second piston, and vent are micromachined from a material.

17. The engine of claim 16, further comprising:

a first transducer situated at a first end of said chamber; and

a second transducer situated at a second end of said chamber.

18. The engine of claim 17, further comprising a detector for sensing positions of said first and second pistons.

19. The engine of claim 18, wherein said first and second pistons are moveable in said chamber towards each other to compress and ignite a fuel, which enters said chamber via said vent, into a combustion that forces said first and second pistons away from each other, resulting in a product of combustion leaving said chamber via said vent.

20. The engine of claim 19, wherein said first and second transducers convert movement of said first and second pistons into electrical energy.

21. The engine of claim 20, further comprising a circuit connected to said first and second detectors and to said first and second transducers.

22. The engine of claim 21, wherein said circuit receives signals from said detectors and outputs signals to said transducers which apply forces to said pistons to synchronize said first and second pistons'"'"' movements in said chamber.

23. The engine of claim 22, wherein said circuit receives electrical energy from said transducer for application to a load or storage.

24. The engine of claim 23, wherein said transducers are electromagnets.

25. The engine of claim 24, wherein said first and second transducers comprise said first and second detectors.

26. The engine of claim 25, further comprising:

a first permanent magnet attached to said first piston;

a second permanent magnet attached to said second piston; and

wherein said first and second permanent magnets affect said first and second transducers, respectively.

27. The engine of claim 26, wherein the material is from a group consisting of silicon, ceramic, sapphire, silicon carbide, Pyrex and metal.

29. A microcombustion engine comprising:

a substantially planar inner layer attached on opposing surfaces thereof to a pair of substantially planar outer layers;

a combustion chamber formed in said inner layer;

first and second linearly opposing pistons situated in said chamber, which pistons are adapted for opposed linear motion in said chamber;

at least one fuel intake port through at least one of the outer layers connecting with said chamber;

at least one at least one exhaust output port through at least one of the outer layers connecting with said chamber; and

wherein said first and second pistons are moveable towards each other so as to compress and ignite a fuel so that the force of combustion causes said first and second pistons to move away from each other, resulting in a product of combustion leaving said chamber through said at least one output port and another fuel to enter said chamber through said at least one intake port to be compressed and ignited by said first and second pistons so that the force of combustion causes said first and second pistons to move away from each other.