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1. WO2007098195 - METHODS AND APPARATUS TO USE ENGINE VALVES AS BOTH INTAKE AND EXHAUST VALVES

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[ EN ]

CLAIMS

What is claimed is:

1. A piston engine comprising:
at least one intake valve and at least one exhaust valve per piston engine cylinder; and,
a flow control valve system for controllably coupling the at least one intake valve to an intake manifold or to an exhaust manifold, and for controllably coupling the at least one exhaust valve to an exhaust manifold or to an intake manifold;
the at least one intake valve and at least one exhaust valve per piston engine cylinder being actuated by carnless actuators .

2. The piston engine of claim 1 wherein the flow control system comprises two, two-way valves per cylinder.

3. The piston engine of claim 2 wherein for each intake valve, a first two-way valve controllably couples the intake valve to the intake manifold or blocks the coupling of the intake valve to the intake manifold, and for each exhaust valve, a second two-way valve controllably couples the exhaust valve to the exhaust manifold or blocks the coupling of the intake valve to the exhaust manifold, the at least one intake valve and the at least one exhaust valve being
manifolded together.

4. The piston engine of claim 3 wherein a first two-way valve controllably couples the at least one intake valve to the intake manifold or blocks the coupling of the at least one intake valve to the intake manifold, and a second two-way valve controllably couples the at least one exhaust valve to Che exhaust manifold or blocks the coupling of the at least one intake valve to the exhaust manifold, the at least one intake valve and the at least one exhaust valve being
manifolded together.

5. The piston engine of claim 1 further comprising a control system for controlling the camless actuators and the flow control valve system to operate the engine as a four cycle engine or as a two cycle engine.

6. The piston engine of claim 1 further comprising a control system for controlling the camless actuators and the flow control valve system to operate the engine using the intake valves for intake and the exhaust valves for exhaust, and to operate the engine using the intake valves for both intake exhaust and the exhaust valves for both intake and exhaust .

7. The piston engine of claim 1 wherein the flow control system couples the intake valves to the intake manifold or blocks the coupling of the intake valves to the intake manifold, and couples the exhaust valves to the exhaust manifold or blocks the coupling of the exhaust valves to the exhaust manifold, the at least one intake valve and the at least one exhaust valve being manifolded together.

8. The piston engine of claim 1 wherein the piston engine is a camless engine further comprising:
a control system for each cylinder to control the intake and exhaust valves so that;
at times, the piston engine operates as a 4 cycle engine using the at least one intake valve as intake valves and the at least one exhaust valve as exhaust valves; and at other times, the piston engine operates as a 4 cycle engine using all the intake and exhaust valves as intake valves and all intake and exhaust valves as exhaust valves.

9. The piston engine of claim 8 further comprising at still other times, the control system controls the intake and exhaust valves so that the piston engine operates as a 2 cycle engine.

10. The piston engine of claim 9 wherein the piston engine sometimes operates as a 2 cycle engine using all the intake and exhaust valves as intake valves and all intake and exhaust valves as exhaust valves.

11. A method of operating a camless piston engine having at least one intake valve and at least one exhaust valve per cylinder comprising:
for each cylinder;
at times, operating the piston engine as a 4 cycle engine using the at least one intake valve as intake valves and the at least one exhaust valve as exhaust valves; and
at other times, operating the piston engine as a 4 cycle engine using all the intake and exhaust valves as intake valves and all intake and exhaust valves as exhaust valves.

12. The method of claim 11 further comprising at still other times, operating the piston engine as a 2 cycle engine.

13. The method of claim 12 wherein the piston engine is sometimes operated as a 2 cycle engine using all the intake and exhaust valves as intake valves and all intake and exhaust valves as exhaust valves.

14. In a piston engine, the improvement comprising:
at least one intake valve and at least one exhaust valve per piston engine cylinder; and,
a flow control system for each cylinder for controllably coupling the at least one intake valve to an intake manifold or to an exhaust manifold, and for controllably coupling the at least one exhaust valve to an exhaust manifold or to an intake manifold.

15. The improvement of claim 14 wherein the flow control system comprises one two-way valve per intake valve and one two-way valve per exhaust valve.

16. The improvement of claim 15 wherein for each intake valve, a first two-way valve controllably couples the intake valve to the intake manifold or blocks the coupling of the intake valve to the intake manifold, and for each exhaust valve, a second two-way valve controllably couples the exhaust valve to the exhaust manifold or blocks the coupling of the exhaust valve to the exhaust manifold, the at least one intake valve and the at least one exhaust valve being manifolded together.

17. The improvement of claim 15 wherein the piston engine includes multiple intake valves and multiple exhaust valves, the flow control system having an air flow area at least as large as the combined intake and exhaust valve air flow area when coupling the intake and exhaust valves to an intake manifold, and when coupling the intake and the exhaust valves to an exhaust manifold.

18. The improvement of claim 14 wherein the flow control system couples the intake valves to the intake manifold or blocks the coupling of the intake valves to the intake manifold, and couples the exhaust valves to the exhaust manifold or blocks the coupling of the exhaust valves to the exhaust manifold, the at least one intake valve and the at least one exhaust valve being manifolded together.