A crank drive device for an internal combustion engine which comprises a crankshaft configured to be eccentrically connected to a connecting rod of a piston and to drive the drive shaft. The crankshaft is eccentrically connected to the camshaft and is rotatably supported with respect to the camshaft. An auxiliary motor which is configured to rotate the rotatable eccentric system.

Described herein is a system for variable actuation of an engine valve of an internal-combustion engine, where the system is able to actuate the engine valves, selectively, in a four-stroke operating mode and in a two-stroke operating mode, on the basis of the operating conditions of the engine.

Described herein is a system for variable actuation of an engine valve of an internal-combustion engine, where the system is able to actuate the engine valves, selectively, in a four-stroke operating mode and in a two-stroke operating mode, on the basis of the operating conditions of the engine.

Described herein is a system for variable actuation of an engine valve of an internal-combustion engine, where the system is able to actuate the engine valves, selectively, in a four-stroke operating mode and in a two-stroke operating mode, on the basis of the operating conditions of the engine.

Described herein is a system for variable actuation of an engine valve of an internal-combustion engine, where the system is able to actuate the engine valves, selectively, in a four-stroke operating mode and in a two-stroke operating mode, on the basis of the operating conditions of the engine.

Described herein is a system for variable actuation of an engine valve of an internal-combustion engine, where the system is able to actuate the engine valves, selectively, in a four-stroke operating mode and in a two-stroke operating mode, on the basis of the operating conditions of the engine.

Described herein is a system for variable actuation of an engine valve of an internal-combustion engine, where the system is able to actuate the engine valves, selectively, in a four-stroke operating mode and in a two-stroke operating mode, on the basis of the operating conditions of the engine.

A method for improving the efficiency of an internal combustion engine having a cycle, for each cylinder of the engine, including intake, compression, power, and exhaust strokes, comprises inserting two strokes into the cycle in addition to the intake, compression, power, and exhaust strokes. No material other than air is introduced into each cylinder during either of the additional two strokes. A high efficiency internal combustion engine system having a cycle, for each cylinder of the engine, including intake, compression, power, and exhaust strokes, comprises a cylinder, a piston, an air intake device, a fuel injector, an exhaust valve device, a camshaft, and an electronic control unit (ECU) configured to control cylinder operation such that two strokes, in addition to the intake, compression, power, and exhaust strokes, are inserted into the cycle. No material other than air is introduced into each cylinder during either of the additional two strokes.

A method for improving the efficiency of an internal combustion engine having a cycle, for each cylinder of the engine, including intake, compression, power, and exhaust strokes, comprises inserting two strokes into the cycle in addition to the intake, compression, power, and exhaust strokes. No material other than air is introduced into each cylinder during either of the additional two strokes. A high efficiency internal combustion engine system having a cycle, for each cylinder of the engine, including intake, compression, power, and exhaust strokes, comprises a cylinder, a piston, an air intake device, a fuel injector, an exhaust valve device, a camshaft, and an electronic control unit (ECU) configured to control cylinder operation such that two strokes, in addition to the intake, compression, power, and exhaust strokes, are inserted into the cycle. No material other than air is introduced into each cylinder during either of the additional two strokes.

A combustion engine comprises a main combustion cylinder configured to enable a piston to move therein; a main valve configured to move in the main combustion cylinder; an upper non-combustion chamber operatively adjacent to the main combustion cylinder; an upper intake valve configured to move in the upper non-combustion chamber and to communicate with an intake manifold; and an upper exhaust valve configured to move in the upper non-combustion chamber and to communicate with an exhaust manifold.