Patent ID: 8657044

Claim:
Method for the operation of an internal combustion engine, said internal combustion engine comprising: at least one combustion chamber bordered by a cylinder, in which a piston is arranged mechanically interconnected to a crank shaft via a piston rod and a cylinder head with an inlet valve and an exhaust valve both mechanically interconnected via a valve gear to the crank shaft; and at least one charge valve which is actuated by a charge valve actuator in a fully variable manner such that the engine is operated in a four stroke pneumatic mode, wherein in a four-stroke pneumatic pump mode, the combustion engine is propelled by the drive train, the method comprising: a. aspirating air via an inlet valve during an intake stroke b. compressing air during the compression stroke, whereby during compression the charge valve is opened and again closed near the highest position of the cylinder transferring air to a pressure tank, c. expanding air in the cylinder during an expansion stroke, and exhausting air via an exhaust valve during an exhaust stroke.