Method of a controlled engine, engine and variants

1. An internal combustion engine comprising a combustion chamber, wherein the engine is configurable to operate in:

a compressionless operating mode where the engine is at least partly driven by combustion of fuel and oxidant in the combustion chamber without compression of the fuel and the oxidant by a compression stroke of the engine without using any piston to compress the fuel and the oxidant, wherein the oxidant is at least one of air or oxygen; and

a compression generating operating mode where the engine is at least partly used to compress a fluid in the combustion chamber using at least one piston to compress the fluid, wherein the fluid includes at least one of air or steam, and discharge the fluid that has been compressed without any fuel in the combustion chamber.

2. The internal combustion engine of claim 1 , wherein the engine is configurable to switch between the compressionless operating mode and the compression generating operating mode while the engine is running.

3. The internal combustion engine of claim 1 , wherein in the compression generating operating mode the contents of the combustion chamber does not include a fuel.

4. The internal combustion engine of claim 1 wherein in the compressionless operating mode the engine is configured to:

initially provide the fuel and the oxidant into the combustion chamber, such that at least one of the fuel and oxidant is provided at a level significantly higher than stochiometric proportions, to thereby act as a buffer for initial combustion of the fuel and oxidant;

ignite the fuel and oxidant in the combustion chamber of the engine to thereby drive the engine; and

subsequent to igniting the fuel and oxidant, provide further fuel and/or oxidant into the combustion chamber, such that levels of fuel and oxidant in the combustion chamber approach stochiometric proportions.

5. The internal combustion engine of claim 4 , wherein the further fuel and/or oxidant is provided in the same stroke of the engine as the initial fuel and oxidant and while the fuel and oxidant are still combusting.

6. The internal combustion engine of claim 1 , wherein the fuel comprises hydrogen, and the oxidant comprises oxygen of at least 90% purity.

7. The internal combustion engine of claim 6 , wherein excess oxygen is provided to act as a buffer for combustion of the fuel and oxidant.

8. The internal combustion engine of claim 1 , wherein the engine comprises the at least one piston, wherein the at least one piston is driven by the combustion of the fuel and oxidant in the compressionless operating mode, wherein the fuel and oxidant is injected into the combustion chamber when the at least one piston is at or near top dead center, and wherein the at least one piston compresses the fluid in the combustion chamber in the compression generating operating mode.

9. The internal combustion engine of claim 1 , wherein the engine comprises a discharge valve provided in association with a discharge port to enable the product of the combusted fuel and the oxidant to escape from the combustion chamber, the engine further comprising a condensing manifold, coupled to the discharge port, configured to provide a low pressure environment to the combustion chamber to thereby at least assist in driving the engine using a pressure differential.

10. The internal combustion engine of claim 9 , wherein the condensing manifold comprises one or more heat exchangers, configured to remove heat from the combustion product in the condensing manifold, and a one-way valve, downstream from the discharge valve, to enable excess product to escape from the condensing manifold, while enabling a low-pressure environment to be created therein.

11. The internal combustion engine of claim 1 , wherein the engine is configured to inject pre-heated water into the combustion chamber, the pre-heated water not chemically involved in the combustion of the fuel and the oxidant, to assist in providing torque to the engine.

12. The internal combustion engine of claim 1 , wherein the engine configurable to switch between the compressionless operating mode where the engine is driven at least partly by combustion of fuel and oxidant in the combustion chamber and a non-combustion operating mode where the engine is driven at least partly without combustion in the combustion chamber, while the engine is running.

13. The internal combustion engine of claim 12 , wherein the engine is configurable to operate in a steam powered operating mode where the engine is driven by the expansion of the water into steam in the combustion chamber.

14. The internal combustion engine of claim 1 , wherein the compressionless operating mode comprises a twin-stroke cycle comprising an expansive power stroke, followed by a discharge stroke and wherein the discharge stroke comprises a contractive power stroke.

15. The internal combustion engine of claim 1 , wherein the compression generating operating mode provides engine braking by restricting the flow of gas from a discharge port of the combustion chamber to compress fluid in the combustion chamber.

16. The internal combustion engine of claim 1 , wherein in the compression generating operating mode the engine compresses air, the engine comprising an intake valve, for receiving uncompressed air, and a discharge valve, for providing the compressed air.

17. The internal combustion engine of claim 1 , wherein the engine is configurable to operate in an air powered mode, wherein the engine is driven, at least in part, by the compressed air.

18. The internal combustion engine of claim 1 , comprising a plurality of cylinders, wherein each cylinder is selectively configurable to operate in one or more operating modes, comprising a compressionless and a compression generating operating mode.

19. A method of operating an internal combustion engine comprising a combustion chamber, the method comprising:

configuring the engine to operate in a compressionless operating mode where the engine is driven by combustion of fuel and oxidant in the combustion chamber without compression of the fuel and oxidant by a compression stroke of the engine without using any piston to compress the fuel and the oxidant; and

subsequently reconfiguring the engine to operate in a compression generating operating mode where the engine is used to compress a fluid in the combustion chamber using at least one piston to compress the fluid, wherein the fluid includes at least one of air or steam, and discharging the fluid that has been compressed without any fuel in the combustion chamber.

20. A power system comprising:

electrolysis unit to generate hydrogen and oxygen from water;

storage means, for storing hydrogen and oxygen; and

an engine according to claim 1 , configured to drive a generator to generate power.